path: root/libavcodec/avcodec.h (plain)
blob: 3a40c4b287ba3db02637c4487032db10bd9bc4f5

1	/*
2	* copyright (c) 2001 Fabrice Bellard
3	*
4	* This file is part of FFmpeg.
5	*
6	* FFmpeg is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU Lesser General Public
8	* License as published by the Free Software Foundation; either
9	* version 2.1 of the License, or (at your option) any later version.
10	*
11	* FFmpeg is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14	* Lesser General Public License for more details.
15	*
16	* You should have received a copy of the GNU Lesser General Public
17	* License along with FFmpeg; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19	*/
20
21	#ifndef AVCODEC_AVCODEC_H
22	#define AVCODEC_AVCODEC_H
23
24	/**
25	* @file
26	* @ingroup libavc
27	* Libavcodec external API header
28	*/
29
30	#include <errno.h>
31	#include "libavutil/samplefmt.h"
32	#include "libavutil/attributes.h"
33	#include "libavutil/avutil.h"
34	#include "libavutil/buffer.h"
35	#include "libavutil/cpu.h"
36	#include "libavutil/channel_layout.h"
37	#include "libavutil/dict.h"
38	#include "libavutil/frame.h"
39	#include "libavutil/log.h"
40	#include "libavutil/pixfmt.h"
41	#include "libavutil/rational.h"
42
43	#include "version.h"
44
45	/**
46	* @defgroup libavc Encoding/Decoding Library
47	* @{
48	*
49	* @defgroup lavc_decoding Decoding
50	* @{
51	* @}
52	*
53	* @defgroup lavc_encoding Encoding
54	* @{
55	* @}
56	*
57	* @defgroup lavc_codec Codecs
58	* @{
59	* @defgroup lavc_codec_native Native Codecs
60	* @{
61	* @}
62	* @defgroup lavc_codec_wrappers External library wrappers
63	* @{
64	* @}
65	* @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
66	* @{
67	* @}
68	* @}
69	* @defgroup lavc_internal Internal
70	* @{
71	* @}
72	* @}
73	*
74	*/
75
76	/**
77	* @defgroup lavc_core Core functions/structures.
78	* @ingroup libavc
79	*
80	* Basic definitions, functions for querying libavcodec capabilities,
81	* allocating core structures, etc.
82	* @{
83	*/
84
85
86	/**
87	* Identify the syntax and semantics of the bitstream.
88	* The principle is roughly:
89	* Two decoders with the same ID can decode the same streams.
90	* Two encoders with the same ID can encode compatible streams.
91	* There may be slight deviations from the principle due to implementation
92	* details.
93	*
94	* If you add a codec ID to this list, add it so that
95	* 1. no value of a existing codec ID changes (that would break ABI),
96	* 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
97	* This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
98	*
99	* After adding new codec IDs, do not forget to add an entry to the codec
100	* descriptor list and bump libavcodec minor version.
101	*/
102	enum AVCodecID {
103	AV_CODEC_ID_NONE,
104
105	/* video codecs */
106	AV_CODEC_ID_MPEG1VIDEO,
107	AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
108	AV_CODEC_ID_MPEG2VIDEO_XVMC,
109	AV_CODEC_ID_H261,
110	AV_CODEC_ID_H263,
111	AV_CODEC_ID_RV10,
112	AV_CODEC_ID_RV20,
113	AV_CODEC_ID_MJPEG,
114	AV_CODEC_ID_MJPEGB,
115	AV_CODEC_ID_LJPEG,
116	AV_CODEC_ID_SP5X,
117	AV_CODEC_ID_JPEGLS,
118	AV_CODEC_ID_MPEG4,
119	AV_CODEC_ID_RAWVIDEO,
120	AV_CODEC_ID_MSMPEG4V1,
121	AV_CODEC_ID_MSMPEG4V2,
122	AV_CODEC_ID_MSMPEG4V3,
123	AV_CODEC_ID_WMV1,
124	AV_CODEC_ID_WMV2,
125	AV_CODEC_ID_H263P,
126	AV_CODEC_ID_H263I,
127	AV_CODEC_ID_FLV1,
128	AV_CODEC_ID_SVQ1,
129	AV_CODEC_ID_SVQ3,
130	AV_CODEC_ID_DVVIDEO,
131	AV_CODEC_ID_HUFFYUV,
132	AV_CODEC_ID_CYUV,
133	AV_CODEC_ID_H264,
134	AV_CODEC_ID_INDEO3,
135	AV_CODEC_ID_VP3,
136	AV_CODEC_ID_THEORA,
137	AV_CODEC_ID_ASV1,
138	AV_CODEC_ID_ASV2,
139	AV_CODEC_ID_FFV1,
140	AV_CODEC_ID_4XM,
141	AV_CODEC_ID_VCR1,
142	AV_CODEC_ID_CLJR,
143	AV_CODEC_ID_MDEC,
144	AV_CODEC_ID_ROQ,
145	AV_CODEC_ID_INTERPLAY_VIDEO,
146	AV_CODEC_ID_XAN_WC3,
147	AV_CODEC_ID_XAN_WC4,
148	AV_CODEC_ID_RPZA,
149	AV_CODEC_ID_CINEPAK,
150	AV_CODEC_ID_WS_VQA,
151	AV_CODEC_ID_MSRLE,
152	AV_CODEC_ID_MSVIDEO1,
153	AV_CODEC_ID_IDCIN,
154	AV_CODEC_ID_8BPS,
155	AV_CODEC_ID_SMC,
156	AV_CODEC_ID_FLIC,
157	AV_CODEC_ID_TRUEMOTION1,
158	AV_CODEC_ID_VMDVIDEO,
159	AV_CODEC_ID_MSZH,
160	AV_CODEC_ID_ZLIB,
161	AV_CODEC_ID_QTRLE,
162	AV_CODEC_ID_TSCC,
163	AV_CODEC_ID_ULTI,
164	AV_CODEC_ID_QDRAW,
165	AV_CODEC_ID_VIXL,
166	AV_CODEC_ID_QPEG,
167	AV_CODEC_ID_PNG,
168	AV_CODEC_ID_PPM,
169	AV_CODEC_ID_PBM,
170	AV_CODEC_ID_PGM,
171	AV_CODEC_ID_PGMYUV,
172	AV_CODEC_ID_PAM,
173	AV_CODEC_ID_FFVHUFF,
174	AV_CODEC_ID_RV30,
175	AV_CODEC_ID_RV40,
176	AV_CODEC_ID_VC1,
177	AV_CODEC_ID_WMV3,
178	AV_CODEC_ID_LOCO,
179	AV_CODEC_ID_WNV1,
180	AV_CODEC_ID_AASC,
181	AV_CODEC_ID_INDEO2,
182	AV_CODEC_ID_FRAPS,
183	AV_CODEC_ID_TRUEMOTION2,
184	AV_CODEC_ID_BMP,
185	AV_CODEC_ID_CSCD,
186	AV_CODEC_ID_MMVIDEO,
187	AV_CODEC_ID_ZMBV,
188	AV_CODEC_ID_AVS,
189	AV_CODEC_ID_SMACKVIDEO,
190	AV_CODEC_ID_NUV,
191	AV_CODEC_ID_KMVC,
192	AV_CODEC_ID_FLASHSV,
193	AV_CODEC_ID_CAVS,
194	AV_CODEC_ID_JPEG2000,
195	AV_CODEC_ID_VMNC,
196	AV_CODEC_ID_VP5,
197	AV_CODEC_ID_VP6,
198	AV_CODEC_ID_VP6F,
199	AV_CODEC_ID_TARGA,
200	AV_CODEC_ID_DSICINVIDEO,
201	AV_CODEC_ID_TIERTEXSEQVIDEO,
202	AV_CODEC_ID_TIFF,
203	AV_CODEC_ID_GIF,
204	AV_CODEC_ID_DXA,
205	AV_CODEC_ID_DNXHD,
206	AV_CODEC_ID_THP,
207	AV_CODEC_ID_SGI,
208	AV_CODEC_ID_C93,
209	AV_CODEC_ID_BETHSOFTVID,
210	AV_CODEC_ID_PTX,
211	AV_CODEC_ID_TXD,
212	AV_CODEC_ID_VP6A,
213	AV_CODEC_ID_AMV,
214	AV_CODEC_ID_VB,
215	AV_CODEC_ID_PCX,
216	AV_CODEC_ID_SUNRAST,
217	AV_CODEC_ID_INDEO4,
218	AV_CODEC_ID_INDEO5,
219	AV_CODEC_ID_MIMIC,
220	AV_CODEC_ID_RL2,
221	AV_CODEC_ID_ESCAPE124,
222	AV_CODEC_ID_DIRAC,
223	AV_CODEC_ID_BFI,
224	AV_CODEC_ID_CMV,
225	AV_CODEC_ID_MOTIONPIXELS,
226	AV_CODEC_ID_TGV,
227	AV_CODEC_ID_TGQ,
228	AV_CODEC_ID_TQI,
229	AV_CODEC_ID_AURA,
230	AV_CODEC_ID_AURA2,
231	AV_CODEC_ID_V210X,
232	AV_CODEC_ID_TMV,
233	AV_CODEC_ID_V210,
234	AV_CODEC_ID_DPX,
235	AV_CODEC_ID_MAD,
236	AV_CODEC_ID_FRWU,
237	AV_CODEC_ID_FLASHSV2,
238	AV_CODEC_ID_CDGRAPHICS,
239	AV_CODEC_ID_R210,
240	AV_CODEC_ID_ANM,
241	AV_CODEC_ID_BINKVIDEO,
242	AV_CODEC_ID_IFF_ILBM,
243	AV_CODEC_ID_IFF_BYTERUN1,
244	AV_CODEC_ID_KGV1,
245	AV_CODEC_ID_YOP,
246	AV_CODEC_ID_VP8,
247	AV_CODEC_ID_PICTOR,
248	AV_CODEC_ID_ANSI,
249	AV_CODEC_ID_A64_MULTI,
250	AV_CODEC_ID_A64_MULTI5,
251	AV_CODEC_ID_R10K,
252	AV_CODEC_ID_MXPEG,
253	AV_CODEC_ID_LAGARITH,
254	AV_CODEC_ID_PRORES,
255	AV_CODEC_ID_JV,
256	AV_CODEC_ID_DFA,
257	AV_CODEC_ID_WMV3IMAGE,
258	AV_CODEC_ID_VC1IMAGE,
259	AV_CODEC_ID_UTVIDEO,
260	AV_CODEC_ID_BMV_VIDEO,
261	AV_CODEC_ID_VBLE,
262	AV_CODEC_ID_DXTORY,
263	AV_CODEC_ID_V410,
264	AV_CODEC_ID_XWD,
265	AV_CODEC_ID_CDXL,
266	AV_CODEC_ID_XBM,
267	AV_CODEC_ID_ZEROCODEC,
268	AV_CODEC_ID_MSS1,
269	AV_CODEC_ID_MSA1,
270	AV_CODEC_ID_TSCC2,
271	AV_CODEC_ID_MTS2,
272	AV_CODEC_ID_CLLC,
273	AV_CODEC_ID_MSS2,
274	AV_CODEC_ID_VP9,
275	AV_CODEC_ID_AIC,
276	AV_CODEC_ID_ESCAPE130_DEPRECATED,
277	AV_CODEC_ID_G2M_DEPRECATED,
278	AV_CODEC_ID_WEBP_DEPRECATED,
279
280	AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
281	AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
282	AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
283	AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
284	AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
285
286	AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
287	AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
288	AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
289	AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
290	AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
291	AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
292	AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
293	AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
294	AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
295	AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
296	AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
297	AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
298	AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
299	AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
300	AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
301	AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
302	AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
303	AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
304	AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
305	AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
306	#define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
307
308	/* various PCM "codecs" */
309	AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
310	AV_CODEC_ID_PCM_S16LE = 0x10000,
311	AV_CODEC_ID_PCM_S16BE,
312	AV_CODEC_ID_PCM_U16LE,
313	AV_CODEC_ID_PCM_U16BE,
314	AV_CODEC_ID_PCM_S8,
315	AV_CODEC_ID_PCM_U8,
316	AV_CODEC_ID_PCM_MULAW,
317	AV_CODEC_ID_PCM_ALAW,
318	AV_CODEC_ID_PCM_S32LE,
319	AV_CODEC_ID_PCM_S32BE,
320	AV_CODEC_ID_PCM_U32LE,
321	AV_CODEC_ID_PCM_U32BE,
322	AV_CODEC_ID_PCM_S24LE,
323	AV_CODEC_ID_PCM_S24BE,
324	AV_CODEC_ID_PCM_U24LE,
325	AV_CODEC_ID_PCM_U24BE,
326	AV_CODEC_ID_PCM_S24DAUD,
327	AV_CODEC_ID_PCM_ZORK,
328	AV_CODEC_ID_PCM_S16LE_PLANAR,
329	AV_CODEC_ID_PCM_DVD,
330	AV_CODEC_ID_PCM_F32BE,
331	AV_CODEC_ID_PCM_F32LE,
332	AV_CODEC_ID_PCM_F64BE,
333	AV_CODEC_ID_PCM_F64LE,
334	AV_CODEC_ID_PCM_BLURAY,
335	AV_CODEC_ID_PCM_LXF,
336	AV_CODEC_ID_S302M,
337	AV_CODEC_ID_PCM_S8_PLANAR,
338	AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED,
339	AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED,
340	AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
341	AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
342	AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
343
344	/* various ADPCM codecs */
345	AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
346	AV_CODEC_ID_ADPCM_IMA_WAV,
347	AV_CODEC_ID_ADPCM_IMA_DK3,
348	AV_CODEC_ID_ADPCM_IMA_DK4,
349	AV_CODEC_ID_ADPCM_IMA_WS,
350	AV_CODEC_ID_ADPCM_IMA_SMJPEG,
351	AV_CODEC_ID_ADPCM_MS,
352	AV_CODEC_ID_ADPCM_4XM,
353	AV_CODEC_ID_ADPCM_XA,
354	AV_CODEC_ID_ADPCM_ADX,
355	AV_CODEC_ID_ADPCM_EA,
356	AV_CODEC_ID_ADPCM_G726,
357	AV_CODEC_ID_ADPCM_CT,
358	AV_CODEC_ID_ADPCM_SWF,
359	AV_CODEC_ID_ADPCM_YAMAHA,
360	AV_CODEC_ID_ADPCM_SBPRO_4,
361	AV_CODEC_ID_ADPCM_SBPRO_3,
362	AV_CODEC_ID_ADPCM_SBPRO_2,
363	AV_CODEC_ID_ADPCM_THP,
364	AV_CODEC_ID_ADPCM_IMA_AMV,
365	AV_CODEC_ID_ADPCM_EA_R1,
366	AV_CODEC_ID_ADPCM_EA_R3,
367	AV_CODEC_ID_ADPCM_EA_R2,
368	AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
369	AV_CODEC_ID_ADPCM_IMA_EA_EACS,
370	AV_CODEC_ID_ADPCM_EA_XAS,
371	AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
372	AV_CODEC_ID_ADPCM_IMA_ISS,
373	AV_CODEC_ID_ADPCM_G722,
374	AV_CODEC_ID_ADPCM_IMA_APC,
375	AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
376	AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
377	AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
378	AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
379	AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
380	AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
381
382	/* AMR */
383	AV_CODEC_ID_AMR_NB = 0x12000,
384	AV_CODEC_ID_AMR_WB,
385
386	/* RealAudio codecs*/
387	AV_CODEC_ID_RA_144 = 0x13000,
388	AV_CODEC_ID_RA_288,
389
390	/* various DPCM codecs */
391	AV_CODEC_ID_ROQ_DPCM = 0x14000,
392	AV_CODEC_ID_INTERPLAY_DPCM,
393	AV_CODEC_ID_XAN_DPCM,
394	AV_CODEC_ID_SOL_DPCM,
395
396	/* audio codecs */
397	AV_CODEC_ID_MP2 = 0x15000,
398	AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
399	AV_CODEC_ID_AAC,
400	AV_CODEC_ID_AC3,
401	AV_CODEC_ID_DTS,
402	AV_CODEC_ID_VORBIS,
403	AV_CODEC_ID_DVAUDIO,
404	AV_CODEC_ID_WMAV1,
405	AV_CODEC_ID_WMAV2,
406	AV_CODEC_ID_MACE3,
407	AV_CODEC_ID_MACE6,
408	AV_CODEC_ID_VMDAUDIO,
409	AV_CODEC_ID_FLAC,
410	AV_CODEC_ID_MP3ADU,
411	AV_CODEC_ID_MP3ON4,
412	AV_CODEC_ID_SHORTEN,
413	AV_CODEC_ID_ALAC,
414	AV_CODEC_ID_WESTWOOD_SND1,
415	AV_CODEC_ID_GSM, ///< as in Berlin toast format
416	AV_CODEC_ID_QDM2,
417	AV_CODEC_ID_COOK,
418	AV_CODEC_ID_TRUESPEECH,
419	AV_CODEC_ID_TTA,
420	AV_CODEC_ID_SMACKAUDIO,
421	AV_CODEC_ID_QCELP,
422	AV_CODEC_ID_WAVPACK,
423	AV_CODEC_ID_DSICINAUDIO,
424	AV_CODEC_ID_IMC,
425	AV_CODEC_ID_MUSEPACK7,
426	AV_CODEC_ID_MLP,
427	AV_CODEC_ID_GSM_MS, /* as found in WAV */
428	AV_CODEC_ID_ATRAC3,
429	#if FF_API_VOXWARE
430	AV_CODEC_ID_VOXWARE,
431	#endif
432	AV_CODEC_ID_APE,
433	AV_CODEC_ID_NELLYMOSER,
434	AV_CODEC_ID_MUSEPACK8,
435	AV_CODEC_ID_SPEEX,
436	AV_CODEC_ID_WMAVOICE,
437	AV_CODEC_ID_WMAPRO,
438	AV_CODEC_ID_WMALOSSLESS,
439	AV_CODEC_ID_ATRAC3P,
440	AV_CODEC_ID_EAC3,
441	AV_CODEC_ID_SIPR,
442	AV_CODEC_ID_MP1,
443	AV_CODEC_ID_TWINVQ,
444	AV_CODEC_ID_TRUEHD,
445	AV_CODEC_ID_MP4ALS,
446	AV_CODEC_ID_ATRAC1,
447	AV_CODEC_ID_BINKAUDIO_RDFT,
448	AV_CODEC_ID_BINKAUDIO_DCT,
449	AV_CODEC_ID_AAC_LATM,
450	AV_CODEC_ID_QDMC,
451	AV_CODEC_ID_CELT,
452	AV_CODEC_ID_G723_1,
453	AV_CODEC_ID_G729,
454	AV_CODEC_ID_8SVX_EXP,
455	AV_CODEC_ID_8SVX_FIB,
456	AV_CODEC_ID_BMV_AUDIO,
457	AV_CODEC_ID_RALF,
458	AV_CODEC_ID_IAC,
459	AV_CODEC_ID_ILBC,
460	AV_CODEC_ID_OPUS_DEPRECATED,
461	AV_CODEC_ID_COMFORT_NOISE,
462	AV_CODEC_ID_TAK_DEPRECATED,
463	AV_CODEC_ID_METASOUND,
464	AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
465	AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
466	AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
467	AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
468	AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
469	AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
470	AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
471	AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
472	AV_CODEC_ID_DRA = MKBETAG('D','A','R','1'),
473
474	/* subtitle codecs */
475	AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
476	AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
477	AV_CODEC_ID_DVB_SUBTITLE,
478	AV_CODEC_ID_TEXT, ///< raw UTF-8 text
479	AV_CODEC_ID_XSUB,
480	AV_CODEC_ID_SSA,
481	AV_CODEC_ID_MOV_TEXT,
482	AV_CODEC_ID_HDMV_PGS_SUBTITLE,
483	AV_CODEC_ID_DVB_TELETEXT,
484	AV_CODEC_ID_SRT,
485	AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
486	AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
487	AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
488	AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
489	AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
490	AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
491	AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
492	AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
493	AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
494	AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
495	AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
496	AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
497	AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
498
499	/* other specific kind of codecs (generally used for attachments) */
500	AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
501	AV_CODEC_ID_TTF = 0x18000,
502	AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
503	AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
504	AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
505	AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
506	AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
507	AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
508
509
510	AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
511
512	AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
513	* stream (only used by libavformat) */
514	AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
515	* stream (only used by libavformat) */
516	AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
517
518	#if FF_API_CODEC_ID
519	#include "old_codec_ids.h"
520	#endif
521	};
522
523	/**
524	* This struct describes the properties of a single codec described by an
525	* AVCodecID.
526	* @see avcodec_get_descriptor()
527	*/
528	typedef struct AVCodecDescriptor {
529	enum AVCodecID id;
530	enum AVMediaType type;
531	/**
532	* Name of the codec described by this descriptor. It is non-empty and
533	* unique for each codec descriptor. It should contain alphanumeric
534	* characters and '_' only.
535	*/
536	const char *name;
537	/**
538	* A more descriptive name for this codec. May be NULL.
539	*/
540	const char *long_name;
541	/**
542	* Codec properties, a combination of AV_CODEC_PROP_* flags.
543	*/
544	int props;
545	} AVCodecDescriptor;
546
547	/**
548	* Codec uses only intra compression.
549	* Video codecs only.
550	*/
551	#define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
552	/**
553	* Codec supports lossy compression. Audio and video codecs only.
554	* @note a codec may support both lossy and lossless
555	* compression modes
556	*/
557	#define AV_CODEC_PROP_LOSSY (1 << 1)
558	/**
559	* Codec supports lossless compression. Audio and video codecs only.
560	*/
561	#define AV_CODEC_PROP_LOSSLESS (1 << 2)
562	/**
563	* Subtitle codec is bitmap based
564	* Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
565	*/
566	#define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
567	/**
568	* Subtitle codec is text based.
569	* Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
570	*/
571	#define AV_CODEC_PROP_TEXT_SUB (1 << 17)
572
573	/**
574	* @ingroup lavc_decoding
575	* Required number of additionally allocated bytes at the end of the input bitstream for decoding.
576	* This is mainly needed because some optimized bitstream readers read
577	* 32 or 64 bit at once and could read over the end.<br>
578	* Note: If the first 23 bits of the additional bytes are not 0, then damaged
579	* MPEG bitstreams could cause overread and segfault.
580	*/
581	#define FF_INPUT_BUFFER_PADDING_SIZE 16
582
583	/**
584	* @ingroup lavc_encoding
585	* minimum encoding buffer size
586	* Used to avoid some checks during header writing.
587	*/
588	#define FF_MIN_BUFFER_SIZE 16384
589
590
591	/**
592	* @ingroup lavc_encoding
593	* motion estimation type.
594	*/
595	enum Motion_Est_ID {
596	ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
597	ME_FULL,
598	ME_LOG,
599	ME_PHODS,
600	ME_EPZS, ///< enhanced predictive zonal search
601	ME_X1, ///< reserved for experiments
602	ME_HEX, ///< hexagon based search
603	ME_UMH, ///< uneven multi-hexagon search
604	ME_TESA, ///< transformed exhaustive search algorithm
605	ME_ITER=50, ///< iterative search
606	};
607
608	/**
609	* @ingroup lavc_decoding
610	*/
611	enum AVDiscard{
612	/* We leave some space between them for extensions (drop some
613	* keyframes for intra-only or drop just some bidir frames). */
614	AVDISCARD_NONE =-16, ///< discard nothing
615	AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
616	AVDISCARD_NONREF = 8, ///< discard all non reference
617	AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
618	AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
619	AVDISCARD_ALL = 48, ///< discard all
620	};
621
622	enum AVColorPrimaries{
623	AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
624	AVCOL_PRI_UNSPECIFIED = 2,
625	AVCOL_PRI_BT470M = 4,
626	AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
627	AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
628	AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
629	AVCOL_PRI_FILM = 8,
630	AVCOL_PRI_NB , ///< Not part of ABI
631	};
632
633	enum AVColorTransferCharacteristic{
634	AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
635	AVCOL_TRC_UNSPECIFIED = 2,
636	AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
637	AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
638	AVCOL_TRC_SMPTE240M = 7,
639	AVCOL_TRC_NB , ///< Not part of ABI
640	};
641
642	/**
643	* X X 3 4 X X are luma samples,
644	* 1 2 1-6 are possible chroma positions
645	* X X 5 6 X 0 is undefined/unknown position
646	*/
647	enum AVChromaLocation{
648	AVCHROMA_LOC_UNSPECIFIED = 0,
649	AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
650	AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
651	AVCHROMA_LOC_TOPLEFT = 3, ///< DV
652	AVCHROMA_LOC_TOP = 4,
653	AVCHROMA_LOC_BOTTOMLEFT = 5,
654	AVCHROMA_LOC_BOTTOM = 6,
655	AVCHROMA_LOC_NB , ///< Not part of ABI
656	};
657
658	enum AVAudioServiceType {
659	AV_AUDIO_SERVICE_TYPE_MAIN = 0,
660	AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
661	AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
662	AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
663	AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
664	AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
665	AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
666	AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
667	AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
668	AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
669	};
670
671	/**
672	* @ingroup lavc_encoding
673	*/
674	typedef struct RcOverride{
675	int start_frame;
676	int end_frame;
677	int qscale; // If this is 0 then quality_factor will be used instead.
678	float quality_factor;
679	} RcOverride;
680
681	#define FF_MAX_B_FRAMES 16
682
683	/* encoding support
684	These flags can be passed in AVCodecContext.flags before initialization.
685	Note: Not everything is supported yet.
686	*/
687
688	/**
689	* Allow decoders to produce frames with data planes that are not aligned
690	* to CPU requirements (e.g. due to cropping).
691	*/
692	#define CODEC_FLAG_UNALIGNED 0x0001
693	#define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
694	#define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
695	#define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
696	#define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
697	#define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
698	/**
699	* The parent program guarantees that the input for B-frames containing
700	* streams is not written to for at least s->max_b_frames+1 frames, if
701	* this is not set the input will be copied.
702	*/
703	#define CODEC_FLAG_INPUT_PRESERVED 0x0100
704	#define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
705	#define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
706	#define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
707	#define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
708	#define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
709	#define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
710	location instead of only at frame boundaries. */
711	#define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
712	#define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
713	#define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
714	#define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
715	#define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
716	/* Fx : Flag for h263+ extra options */
717	#define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
718	#define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
719	#define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
720	#define CODEC_FLAG_CLOSED_GOP 0x80000000
721	#define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
722	#define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
723	#define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
724	#define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
725	#define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
726
727	#define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
728	#define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
729
730	/* Unsupported options :
731	* Syntax Arithmetic coding (SAC)
732	* Reference Picture Selection
733	* Independent Segment Decoding */
734	/* /Fx */
735	/* codec capabilities */
736
737	#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
738	/**
739	* Codec uses get_buffer() for allocating buffers and supports custom allocators.
740	* If not set, it might not use get_buffer() at all or use operations that
741	* assume the buffer was allocated by avcodec_default_get_buffer.
742	*/
743	#define CODEC_CAP_DR1 0x0002
744	#define CODEC_CAP_TRUNCATED 0x0008
745	/* Codec can export data for HW decoding (XvMC). */
746	#define CODEC_CAP_HWACCEL 0x0010
747	/**
748	* Encoder or decoder requires flushing with NULL input at the end in order to
749	* give the complete and correct output.
750	*
751	* NOTE: If this flag is not set, the codec is guaranteed to never be fed with
752	* with NULL data. The user can still send NULL data to the public encode
753	* or decode function, but libavcodec will not pass it along to the codec
754	* unless this flag is set.
755	*
756	* Decoders:
757	* The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
758	* avpkt->size=0 at the end to get the delayed data until the decoder no longer
759	* returns frames.
760	*
761	* Encoders:
762	* The encoder needs to be fed with NULL data at the end of encoding until the
763	* encoder no longer returns data.
764	*
765	* NOTE: For encoders implementing the AVCodec.encode2() function, setting this
766	* flag also means that the encoder must set the pts and duration for
767	* each output packet. If this flag is not set, the pts and duration will
768	* be determined by libavcodec from the input frame.
769	*/
770	#define CODEC_CAP_DELAY 0x0020
771	/**
772	* Codec can be fed a final frame with a smaller size.
773	* This can be used to prevent truncation of the last audio samples.
774	*/
775	#define CODEC_CAP_SMALL_LAST_FRAME 0x0040
776	#if FF_API_CAP_VDPAU
777	/**
778	* Codec can export data for HW decoding (VDPAU).
779	*/
780	#define CODEC_CAP_HWACCEL_VDPAU 0x0080
781	#endif
782	/**
783	* Codec can output multiple frames per AVPacket
784	* Normally demuxers return one frame at a time, demuxers which do not do
785	* are connected to a parser to split what they return into proper frames.
786	* This flag is reserved to the very rare category of codecs which have a
787	* bitstream that cannot be split into frames without timeconsuming
788	* operations like full decoding. Demuxers carring such bitstreams thus
789	* may return multiple frames in a packet. This has many disadvantages like
790	* prohibiting stream copy in many cases thus it should only be considered
791	* as a last resort.
792	*/
793	#define CODEC_CAP_SUBFRAMES 0x0100
794	/**
795	* Codec is experimental and is thus avoided in favor of non experimental
796	* encoders
797	*/
798	#define CODEC_CAP_EXPERIMENTAL 0x0200
799	/**
800	* Codec should fill in channel configuration and samplerate instead of container
801	*/
802	#define CODEC_CAP_CHANNEL_CONF 0x0400
803
804	/**
805	* Codec is able to deal with negative linesizes
806	*/
807	#define CODEC_CAP_NEG_LINESIZES 0x0800
808
809	/**
810	* Codec supports frame-level multithreading.
811	*/
812	#define CODEC_CAP_FRAME_THREADS 0x1000
813	/**
814	* Codec supports slice-based (or partition-based) multithreading.
815	*/
816	#define CODEC_CAP_SLICE_THREADS 0x2000
817	/**
818	* Codec supports changed parameters at any point.
819	*/
820	#define CODEC_CAP_PARAM_CHANGE 0x4000
821	/**
822	* Codec supports avctx->thread_count == 0 (auto).
823	*/
824	#define CODEC_CAP_AUTO_THREADS 0x8000
825	/**
826	* Audio encoder supports receiving a different number of samples in each call.
827	*/
828	#define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
829	/**
830	* Codec is intra only.
831	*/
832	#define CODEC_CAP_INTRA_ONLY 0x40000000
833	/**
834	* Codec is lossless.
835	*/
836	#define CODEC_CAP_LOSSLESS 0x80000000
837
838	//The following defines may change, don't expect compatibility if you use them.
839	#define MB_TYPE_INTRA4x4 0x0001
840	#define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
841	#define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
842	#define MB_TYPE_16x16 0x0008
843	#define MB_TYPE_16x8 0x0010
844	#define MB_TYPE_8x16 0x0020
845	#define MB_TYPE_8x8 0x0040
846	#define MB_TYPE_INTERLACED 0x0080
847	#define MB_TYPE_DIRECT2 0x0100 //FIXME
848	#define MB_TYPE_ACPRED 0x0200
849	#define MB_TYPE_GMC 0x0400
850	#define MB_TYPE_SKIP 0x0800
851	#define MB_TYPE_P0L0 0x1000
852	#define MB_TYPE_P1L0 0x2000
853	#define MB_TYPE_P0L1 0x4000
854	#define MB_TYPE_P1L1 0x8000
855	#define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
856	#define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
857	#define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
858	#define MB_TYPE_QUANT 0x00010000
859	#define MB_TYPE_CBP 0x00020000
860	//Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
861
862	/**
863	* Pan Scan area.
864	* This specifies the area which should be displayed.
865	* Note there may be multiple such areas for one frame.
866	*/
867	typedef struct AVPanScan{
868	/**
869	* id
870	* - encoding: Set by user.
871	* - decoding: Set by libavcodec.
872	*/
873	int id;
874
875	/**
876	* width and height in 1/16 pel
877	* - encoding: Set by user.
878	* - decoding: Set by libavcodec.
879	*/
880	int width;
881	int height;
882
883	/**
884	* position of the top left corner in 1/16 pel for up to 3 fields/frames
885	* - encoding: Set by user.
886	* - decoding: Set by libavcodec.
887	*/
888	int16_t position[3][2];
889	}AVPanScan;
890
891	#define FF_QSCALE_TYPE_MPEG1 0
892	#define FF_QSCALE_TYPE_MPEG2 1
893	#define FF_QSCALE_TYPE_H264 2
894	#define FF_QSCALE_TYPE_VP56 3
895
896	#if FF_API_GET_BUFFER
897	#define FF_BUFFER_TYPE_INTERNAL 1
898	#define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
899	#define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
900	#define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
901
902	#define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
903	#define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
904	#define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
905	#define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
906	#endif
907
908	/**
909	* The decoder will keep a reference to the frame and may reuse it later.
910	*/
911	#define AV_GET_BUFFER_FLAG_REF (1 << 0)
912
913	/**
914	* @defgroup lavc_packet AVPacket
915	*
916	* Types and functions for working with AVPacket.
917	* @{
918	*/
919	enum AVPacketSideDataType {
920	AV_PKT_DATA_PALETTE,
921	AV_PKT_DATA_NEW_EXTRADATA,
922
923	/**
924	* An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
925	* @code
926	* u32le param_flags
927	* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
928	* s32le channel_count
929	* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
930	* u64le channel_layout
931	* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
932	* s32le sample_rate
933	* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
934	* s32le width
935	* s32le height
936	* @endcode
937	*/
938	AV_PKT_DATA_PARAM_CHANGE,
939
940	/**
941	* An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
942	* structures with info about macroblocks relevant to splitting the
943	* packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
944	* That is, it does not necessarily contain info about all macroblocks,
945	* as long as the distance between macroblocks in the info is smaller
946	* than the target payload size.
947	* Each MB info structure is 12 bytes, and is laid out as follows:
948	* @code
949	* u32le bit offset from the start of the packet
950	* u8 current quantizer at the start of the macroblock
951	* u8 GOB number
952	* u16le macroblock address within the GOB
953	* u8 horizontal MV predictor
954	* u8 vertical MV predictor
955	* u8 horizontal MV predictor for block number 3
956	* u8 vertical MV predictor for block number 3
957	* @endcode
958	*/
959	AV_PKT_DATA_H263_MB_INFO,
960
961	/**
962	* Recommmends skipping the specified number of samples
963	* @code
964	* u32le number of samples to skip from start of this packet
965	* u32le number of samples to skip from end of this packet
966	* u8 reason for start skip
967	* u8 reason for end skip (0=padding silence, 1=convergence)
968	* @endcode
969	*/
970	AV_PKT_DATA_SKIP_SAMPLES=70,
971
972	/**
973	* An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
974	* the packet may contain "dual mono" audio specific to Japanese DTV
975	* and if it is true, recommends only the selected channel to be used.
976	* @code
977	* u8 selected channels (0=mail/left, 1=sub/right, 2=both)
978	* @endcode
979	*/
980	AV_PKT_DATA_JP_DUALMONO,
981
982	/**
983	* A list of zero terminated key/value strings. There is no end marker for
984	* the list, so it is required to rely on the side data size to stop.
985	*/
986	AV_PKT_DATA_STRINGS_METADATA,
987
988	/**
989	* Subtitle event position
990	* @code
991	* u32le x1
992	* u32le y1
993	* u32le x2
994	* u32le y2
995	* @endcode
996	*/
997	AV_PKT_DATA_SUBTITLE_POSITION,
998
999	/**
1000	* Data found in BlockAdditional element of matroska container. There is
1001	* no end marker for the data, so it is required to rely on the side data
1002	* size to recognize the end. 8 byte id (as found in BlockAddId) followed
1003	* by data.
1004	*/
1005	AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1006
1007	/**
1008	* The optional first identifier line of a WebVTT cue.
1009	*/
1010	AV_PKT_DATA_WEBVTT_IDENTIFIER,
1011
1012	/**
1013	* The optional settings (rendering instructions) that immediately
1014	* follow the timestamp specifier of a WebVTT cue.
1015	*/
1016	AV_PKT_DATA_WEBVTT_SETTINGS,
1017	};
1018
1019	/**
1020	* This structure stores compressed data. It is typically exported by demuxers
1021	* and then passed as input to decoders, or received as output from encoders and
1022	* then passed to muxers.
1023	*
1024	* For video, it should typically contain one compressed frame. For audio it may
1025	* contain several compressed frames.
1026	*
1027	* AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1028	* ABI. Thus it may be allocated on stack and no new fields can be added to it
1029	* without libavcodec and libavformat major bump.
1030	*
1031	* The semantics of data ownership depends on the buf or destruct (deprecated)
1032	* fields. If either is set, the packet data is dynamically allocated and is
1033	* valid indefinitely until av_free_packet() is called (which in turn calls
1034	* av_buffer_unref()/the destruct callback to free the data). If neither is set,
1035	* the packet data is typically backed by some static buffer somewhere and is
1036	* only valid for a limited time (e.g. until the next read call when demuxing).
1037	*
1038	* The side data is always allocated with av_malloc() and is freed in
1039	* av_free_packet().
1040	*/
1041	typedef struct AVPacket {
1042	/**
1043	* A reference to the reference-counted buffer where the packet data is
1044	* stored.
1045	* May be NULL, then the packet data is not reference-counted.
1046	*/
1047	AVBufferRef *buf;
1048	/**
1049	* Presentation timestamp in AVStream->time_base units; the time at which
1050	* the decompressed packet will be presented to the user.
1051	* Can be AV_NOPTS_VALUE if it is not stored in the file.
1052	* pts MUST be larger or equal to dts as presentation cannot happen before
1053	* decompression, unless one wants to view hex dumps. Some formats misuse
1054	* the terms dts and pts/cts to mean something different. Such timestamps
1055	* must be converted to true pts/dts before they are stored in AVPacket.
1056	*/
1057	int64_t pts;
1058	/**
1059	* Decompression timestamp in AVStream->time_base units; the time at which
1060	* the packet is decompressed.
1061	* Can be AV_NOPTS_VALUE if it is not stored in the file.
1062	*/
1063	int64_t dts;
1064	uint8_t *data;
1065	int size;
1066	int stream_index;
1067	/**
1068	* A combination of AV_PKT_FLAG values
1069	*/
1070	int flags;
1071	/**
1072	* Additional packet data that can be provided by the container.
1073	* Packet can contain several types of side information.
1074	*/
1075	struct {
1076	uint8_t *data;
1077	int size;
1078	enum AVPacketSideDataType type;
1079	} *side_data;
1080	int side_data_elems;
1081
1082	/**
1083	* Duration of this packet in AVStream->time_base units, 0 if unknown.
1084	* Equals next_pts - this_pts in presentation order.
1085	*/
1086	int duration;
1087	#if FF_API_DESTRUCT_PACKET
1088	attribute_deprecated
1089	void (*destruct)(struct AVPacket *);
1090	attribute_deprecated
1091	void *priv;
1092	#endif
1093	int64_t pos; ///< byte position in stream, -1 if unknown
1094
1095	/**
1096	* Time difference in AVStream->time_base units from the pts of this
1097	* packet to the point at which the output from the decoder has converged
1098	* independent from the availability of previous frames. That is, the
1099	* frames are virtually identical no matter if decoding started from
1100	* the very first frame or from this keyframe.
1101	* Is AV_NOPTS_VALUE if unknown.
1102	* This field is not the display duration of the current packet.
1103	* This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1104	* set.
1105	*
1106	* The purpose of this field is to allow seeking in streams that have no
1107	* keyframes in the conventional sense. It corresponds to the
1108	* recovery point SEI in H.264 and match_time_delta in NUT. It is also
1109	* essential for some types of subtitle streams to ensure that all
1110	* subtitles are correctly displayed after seeking.
1111	*/
1112	int64_t convergence_duration;
1113	} AVPacket;
1114	#define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1115	#define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1116
1117	enum AVSideDataParamChangeFlags {
1118	AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1119	AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1120	AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1121	AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1122	};
1123	/**
1124	* @}
1125	*/
1126
1127	struct AVCodecInternal;
1128
1129	enum AVFieldOrder {
1130	AV_FIELD_UNKNOWN,
1131	AV_FIELD_PROGRESSIVE,
1132	AV_FIELD_TT, //< Top coded_first, top displayed first
1133	AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1134	AV_FIELD_TB, //< Top coded first, bottom displayed first
1135	AV_FIELD_BT, //< Bottom coded first, top displayed first
1136	};
1137
1138	/**
1139	* main external API structure.
1140	* New fields can be added to the end with minor version bumps.
1141	* Removal, reordering and changes to existing fields require a major
1142	* version bump.
1143	* Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1144	* applications.
1145	* sizeof(AVCodecContext) must not be used outside libav*.
1146	*/
1147	typedef struct AVCodecContext {
1148	/**
1149	* information on struct for av_log
1150	* - set by avcodec_alloc_context3
1151	*/
1152	const AVClass *av_class;
1153	int log_level_offset;
1154
1155	enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1156	const struct AVCodec *codec;
1157	char codec_name[32];
1158	enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1159
1160	/**
1161	* fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1162	* This is used to work around some encoder bugs.
1163	* A demuxer should set this to what is stored in the field used to identify the codec.
1164	* If there are multiple such fields in a container then the demuxer should choose the one
1165	* which maximizes the information about the used codec.
1166	* If the codec tag field in a container is larger than 32 bits then the demuxer should
1167	* remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1168	* extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1169	* first.
1170	* - encoding: Set by user, if not then the default based on codec_id will be used.
1171	* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1172	*/
1173	unsigned int codec_tag;
1174
1175	/**
1176	* fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1177	* This is used to work around some encoder bugs.
1178	* - encoding: unused
1179	* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1180	*/
1181	unsigned int stream_codec_tag;
1182
1183	void *priv_data;
1184
1185	/**
1186	* Private context used for internal data.
1187	*
1188	* Unlike priv_data, this is not codec-specific. It is used in general
1189	* libavcodec functions.
1190	*/
1191	struct AVCodecInternal *internal;
1192
1193	/**
1194	* Private data of the user, can be used to carry app specific stuff.
1195	* - encoding: Set by user.
1196	* - decoding: Set by user.
1197	*/
1198	void *opaque;
1199
1200	/**
1201	* the average bitrate
1202	* - encoding: Set by user; unused for constant quantizer encoding.
1203	* - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1204	*/
1205	int bit_rate;
1206
1207	/**
1208	* number of bits the bitstream is allowed to diverge from the reference.
1209	* the reference can be CBR (for CBR pass1) or VBR (for pass2)
1210	* - encoding: Set by user; unused for constant quantizer encoding.
1211	* - decoding: unused
1212	*/
1213	int bit_rate_tolerance;
1214
1215	/**
1216	* Global quality for codecs which cannot change it per frame.
1217	* This should be proportional to MPEG-1/2/4 qscale.
1218	* - encoding: Set by user.
1219	* - decoding: unused
1220	*/
1221	int global_quality;
1222
1223	/**
1224	* - encoding: Set by user.
1225	* - decoding: unused
1226	*/
1227	int compression_level;
1228	#define FF_COMPRESSION_DEFAULT -1
1229
1230	/**
1231	* CODEC_FLAG_*.
1232	* - encoding: Set by user.
1233	* - decoding: Set by user.
1234	*/
1235	int flags;
1236
1237	/**
1238	* CODEC_FLAG2_*
1239	* - encoding: Set by user.
1240	* - decoding: Set by user.
1241	*/
1242	int flags2;
1243
1244	/**
1245	* some codecs need / can use extradata like Huffman tables.
1246	* mjpeg: Huffman tables
1247	* rv10: additional flags
1248	* mpeg4: global headers (they can be in the bitstream or here)
1249	* The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1250	* than extradata_size to avoid problems if it is read with the bitstream reader.
1251	* The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1252	* - encoding: Set/allocated/freed by libavcodec.
1253	* - decoding: Set/allocated/freed by user.
1254	*/
1255	uint8_t *extradata;
1256	int extradata_size;
1257
1258	/**
1259	* This is the fundamental unit of time (in seconds) in terms
1260	* of which frame timestamps are represented. For fixed-fps content,
1261	* timebase should be 1/framerate and timestamp increments should be
1262	* identically 1.
1263	* - encoding: MUST be set by user.
1264	* - decoding: Set by libavcodec.
1265	*/
1266	AVRational time_base;
1267
1268	/**
1269	* For some codecs, the time base is closer to the field rate than the frame rate.
1270	* Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1271	* if no telecine is used ...
1272	*
1273	* Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1274	*/
1275	int ticks_per_frame;
1276
1277	/**
1278	* Codec delay.
1279	*
1280	* Encoding: Number of frames delay there will be from the encoder input to
1281	* the decoder output. (we assume the decoder matches the spec)
1282	* Decoding: Number of frames delay in addition to what a standard decoder
1283	* as specified in the spec would produce.
1284	*
1285	* Video:
1286	* Number of frames the decoded output will be delayed relative to the
1287	* encoded input.
1288	*
1289	* Audio:
1290	* For encoding, this is the number of "priming" samples added to the
1291	* beginning of the stream. The decoded output will be delayed by this
1292	* many samples relative to the input to the encoder. Note that this
1293	* field is purely informational and does not directly affect the pts
1294	* output by the encoder, which should always be based on the actual
1295	* presentation time, including any delay.
1296	* For decoding, this is the number of samples the decoder needs to
1297	* output before the decoder's output is valid. When seeking, you should
1298	* start decoding this many samples prior to your desired seek point.
1299	*
1300	* - encoding: Set by libavcodec.
1301	* - decoding: Set by libavcodec.
1302	*/
1303	int delay;
1304
1305
1306	/* video only */
1307	/**
1308	* picture width / height.
1309	* - encoding: MUST be set by user.
1310	* - decoding: May be set by the user before opening the decoder if known e.g.
1311	* from the container. Some decoders will require the dimensions
1312	* to be set by the caller. During decoding, the decoder may
1313	* overwrite those values as required.
1314	*/
1315	int width, height;
1316
1317	/**
1318	* Bitstream width / height, may be different from width/height e.g. when
1319	* the decoded frame is cropped before being output or lowres is enabled.
1320	* - encoding: unused
1321	* - decoding: May be set by the user before opening the decoder if known
1322	* e.g. from the container. During decoding, the decoder may
1323	* overwrite those values as required.
1324	*/
1325	int coded_width, coded_height;
1326
1327	#define FF_ASPECT_EXTENDED 15
1328
1329	/**
1330	* the number of pictures in a group of pictures, or 0 for intra_only
1331	* - encoding: Set by user.
1332	* - decoding: unused
1333	*/
1334	int gop_size;
1335
1336	/**
1337	* Pixel format, see AV_PIX_FMT_xxx.
1338	* May be set by the demuxer if known from headers.
1339	* May be overridden by the decoder if it knows better.
1340	* - encoding: Set by user.
1341	* - decoding: Set by user if known, overridden by libavcodec if known
1342	*/
1343	enum AVPixelFormat pix_fmt;
1344
1345	/**
1346	* Motion estimation algorithm used for video coding.
1347	* 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1348	* 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1349	* - encoding: MUST be set by user.
1350	* - decoding: unused
1351	*/
1352	int me_method;
1353
1354	/**
1355	* If non NULL, 'draw_horiz_band' is called by the libavcodec
1356	* decoder to draw a horizontal band. It improves cache usage. Not
1357	* all codecs can do that. You must check the codec capabilities
1358	* beforehand.
1359	* When multithreading is used, it may be called from multiple threads
1360	* at the same time; threads might draw different parts of the same AVFrame,
1361	* or multiple AVFrames, and there is no guarantee that slices will be drawn
1362	* in order.
1363	* The function is also used by hardware acceleration APIs.
1364	* It is called at least once during frame decoding to pass
1365	* the data needed for hardware render.
1366	* In that mode instead of pixel data, AVFrame points to
1367	* a structure specific to the acceleration API. The application
1368	* reads the structure and can change some fields to indicate progress
1369	* or mark state.
1370	* - encoding: unused
1371	* - decoding: Set by user.
1372	* @param height the height of the slice
1373	* @param y the y position of the slice
1374	* @param type 1->top field, 2->bottom field, 3->frame
1375	* @param offset offset into the AVFrame.data from which the slice should be read
1376	*/
1377	void (*draw_horiz_band)(struct AVCodecContext *s,
1378	const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1379	int y, int type, int height);
1380
1381	/**
1382	* callback to negotiate the pixelFormat
1383	* @param fmt is the list of formats which are supported by the codec,
1384	* it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1385	* The first is always the native one.
1386	* @return the chosen format
1387	* - encoding: unused
1388	* - decoding: Set by user, if not set the native format will be chosen.
1389	*/
1390	enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1391
1392	/**
1393	* maximum number of B-frames between non-B-frames
1394	* Note: The output will be delayed by max_b_frames+1 relative to the input.
1395	* - encoding: Set by user.
1396	* - decoding: unused
1397	*/
1398	int max_b_frames;
1399
1400	/**
1401	* qscale factor between IP and B-frames
1402	* If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1403	* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1404	* - encoding: Set by user.
1405	* - decoding: unused
1406	*/
1407	float b_quant_factor;
1408
1409	/** obsolete FIXME remove */
1410	int rc_strategy;
1411	#define FF_RC_STRATEGY_XVID 1
1412
1413	int b_frame_strategy;
1414
1415	/**
1416	* qscale offset between IP and B-frames
1417	* - encoding: Set by user.
1418	* - decoding: unused
1419	*/
1420	float b_quant_offset;
1421
1422	/**
1423	* Size of the frame reordering buffer in the decoder.
1424	* For MPEG-2 it is 1 IPB or 0 low delay IP.
1425	* - encoding: Set by libavcodec.
1426	* - decoding: Set by libavcodec.
1427	*/
1428	int has_b_frames;
1429
1430	/**
1431	* 0-> h263 quant 1-> mpeg quant
1432	* - encoding: Set by user.
1433	* - decoding: unused
1434	*/
1435	int mpeg_quant;
1436
1437	/**
1438	* qscale factor between P and I-frames
1439	* If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1440	* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1441	* - encoding: Set by user.
1442	* - decoding: unused
1443	*/
1444	float i_quant_factor;
1445
1446	/**
1447	* qscale offset between P and I-frames
1448	* - encoding: Set by user.
1449	* - decoding: unused
1450	*/
1451	float i_quant_offset;
1452
1453	/**
1454	* luminance masking (0-> disabled)
1455	* - encoding: Set by user.
1456	* - decoding: unused
1457	*/
1458	float lumi_masking;
1459
1460	/**
1461	* temporary complexity masking (0-> disabled)
1462	* - encoding: Set by user.
1463	* - decoding: unused
1464	*/
1465	float temporal_cplx_masking;
1466
1467	/**
1468	* spatial complexity masking (0-> disabled)
1469	* - encoding: Set by user.
1470	* - decoding: unused
1471	*/
1472	float spatial_cplx_masking;
1473
1474	/**
1475	* p block masking (0-> disabled)
1476	* - encoding: Set by user.
1477	* - decoding: unused
1478	*/
1479	float p_masking;
1480
1481	/**
1482	* darkness masking (0-> disabled)
1483	* - encoding: Set by user.
1484	* - decoding: unused
1485	*/
1486	float dark_masking;
1487
1488	/**
1489	* slice count
1490	* - encoding: Set by libavcodec.
1491	* - decoding: Set by user (or 0).
1492	*/
1493	int slice_count;
1494	/**
1495	* prediction method (needed for huffyuv)
1496	* - encoding: Set by user.
1497	* - decoding: unused
1498	*/
1499	int prediction_method;
1500	#define FF_PRED_LEFT 0
1501	#define FF_PRED_PLANE 1
1502	#define FF_PRED_MEDIAN 2
1503
1504	/**
1505	* slice offsets in the frame in bytes
1506	* - encoding: Set/allocated by libavcodec.
1507	* - decoding: Set/allocated by user (or NULL).
1508	*/
1509	int *slice_offset;
1510
1511	/**
1512	* sample aspect ratio (0 if unknown)
1513	* That is the width of a pixel divided by the height of the pixel.
1514	* Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1515	* - encoding: Set by user.
1516	* - decoding: Set by libavcodec.
1517	*/
1518	AVRational sample_aspect_ratio;
1519
1520	/**
1521	* motion estimation comparison function
1522	* - encoding: Set by user.
1523	* - decoding: unused
1524	*/
1525	int me_cmp;
1526	/**
1527	* subpixel motion estimation comparison function
1528	* - encoding: Set by user.
1529	* - decoding: unused
1530	*/
1531	int me_sub_cmp;
1532	/**
1533	* macroblock comparison function (not supported yet)
1534	* - encoding: Set by user.
1535	* - decoding: unused
1536	*/
1537	int mb_cmp;
1538	/**
1539	* interlaced DCT comparison function
1540	* - encoding: Set by user.
1541	* - decoding: unused
1542	*/
1543	int ildct_cmp;
1544	#define FF_CMP_SAD 0
1545	#define FF_CMP_SSE 1
1546	#define FF_CMP_SATD 2
1547	#define FF_CMP_DCT 3
1548	#define FF_CMP_PSNR 4
1549	#define FF_CMP_BIT 5
1550	#define FF_CMP_RD 6
1551	#define FF_CMP_ZERO 7
1552	#define FF_CMP_VSAD 8
1553	#define FF_CMP_VSSE 9
1554	#define FF_CMP_NSSE 10
1555	#define FF_CMP_W53 11
1556	#define FF_CMP_W97 12
1557	#define FF_CMP_DCTMAX 13
1558	#define FF_CMP_DCT264 14
1559	#define FF_CMP_CHROMA 256
1560
1561	/**
1562	* ME diamond size & shape
1563	* - encoding: Set by user.
1564	* - decoding: unused
1565	*/
1566	int dia_size;
1567
1568	/**
1569	* amount of previous MV predictors (2a+1 x 2a+1 square)
1570	* - encoding: Set by user.
1571	* - decoding: unused
1572	*/
1573	int last_predictor_count;
1574
1575	/**
1576	* prepass for motion estimation
1577	* - encoding: Set by user.
1578	* - decoding: unused
1579	*/
1580	int pre_me;
1581
1582	/**
1583	* motion estimation prepass comparison function
1584	* - encoding: Set by user.
1585	* - decoding: unused
1586	*/
1587	int me_pre_cmp;
1588
1589	/**
1590	* ME prepass diamond size & shape
1591	* - encoding: Set by user.
1592	* - decoding: unused
1593	*/
1594	int pre_dia_size;
1595
1596	/**
1597	* subpel ME quality
1598	* - encoding: Set by user.
1599	* - decoding: unused
1600	*/
1601	int me_subpel_quality;
1602
1603	/**
1604	* DTG active format information (additional aspect ratio
1605	* information only used in DVB MPEG-2 transport streams)
1606	* 0 if not set.
1607	*
1608	* - encoding: unused
1609	* - decoding: Set by decoder.
1610	*/
1611	int dtg_active_format;
1612	#define FF_DTG_AFD_SAME 8
1613	#define FF_DTG_AFD_4_3 9
1614	#define FF_DTG_AFD_16_9 10
1615	#define FF_DTG_AFD_14_9 11
1616	#define FF_DTG_AFD_4_3_SP_14_9 13
1617	#define FF_DTG_AFD_16_9_SP_14_9 14
1618	#define FF_DTG_AFD_SP_4_3 15
1619
1620	/**
1621	* maximum motion estimation search range in subpel units
1622	* If 0 then no limit.
1623	*
1624	* - encoding: Set by user.
1625	* - decoding: unused
1626	*/
1627	int me_range;
1628
1629	/**
1630	* intra quantizer bias
1631	* - encoding: Set by user.
1632	* - decoding: unused
1633	*/
1634	int intra_quant_bias;
1635	#define FF_DEFAULT_QUANT_BIAS 999999
1636
1637	/**
1638	* inter quantizer bias
1639	* - encoding: Set by user.
1640	* - decoding: unused
1641	*/
1642	int inter_quant_bias;
1643
1644	/**
1645	* slice flags
1646	* - encoding: unused
1647	* - decoding: Set by user.
1648	*/
1649	int slice_flags;
1650	#define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1651	#define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1652	#define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1653
1654	/**
1655	* XVideo Motion Acceleration
1656	* - encoding: forbidden
1657	* - decoding: set by decoder
1658	*/
1659	int xvmc_acceleration;
1660
1661	/**
1662	* macroblock decision mode
1663	* - encoding: Set by user.
1664	* - decoding: unused
1665	*/
1666	int mb_decision;
1667	#define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1668	#define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1669	#define FF_MB_DECISION_RD 2 ///< rate distortion
1670
1671	/**
1672	* custom intra quantization matrix
1673	* - encoding: Set by user, can be NULL.
1674	* - decoding: Set by libavcodec.
1675	*/
1676	uint16_t *intra_matrix;
1677
1678	/**
1679	* custom inter quantization matrix
1680	* - encoding: Set by user, can be NULL.
1681	* - decoding: Set by libavcodec.
1682	*/
1683	uint16_t *inter_matrix;
1684
1685	/**
1686	* scene change detection threshold
1687	* 0 is default, larger means fewer detected scene changes.
1688	* - encoding: Set by user.
1689	* - decoding: unused
1690	*/
1691	int scenechange_threshold;
1692
1693	/**
1694	* noise reduction strength
1695	* - encoding: Set by user.
1696	* - decoding: unused
1697	*/
1698	int noise_reduction;
1699
1700	/**
1701	* Motion estimation threshold below which no motion estimation is
1702	* performed, but instead the user specified motion vectors are used.
1703	*
1704	* - encoding: Set by user.
1705	* - decoding: unused
1706	*/
1707	int me_threshold;
1708
1709	/**
1710	* Macroblock threshold below which the user specified macroblock types will be used.
1711	* - encoding: Set by user.
1712	* - decoding: unused
1713	*/
1714	int mb_threshold;
1715
1716	/**
1717	* precision of the intra DC coefficient - 8
1718	* - encoding: Set by user.
1719	* - decoding: unused
1720	*/
1721	int intra_dc_precision;
1722
1723	/**
1724	* Number of macroblock rows at the top which are skipped.
1725	* - encoding: unused
1726	* - decoding: Set by user.
1727	*/
1728	int skip_top;
1729
1730	/**
1731	* Number of macroblock rows at the bottom which are skipped.
1732	* - encoding: unused
1733	* - decoding: Set by user.
1734	*/
1735	int skip_bottom;
1736
1737	/**
1738	* Border processing masking, raises the quantizer for mbs on the borders
1739	* of the picture.
1740	* - encoding: Set by user.
1741	* - decoding: unused
1742	*/
1743	float border_masking;
1744
1745	/**
1746	* minimum MB lagrange multipler
1747	* - encoding: Set by user.
1748	* - decoding: unused
1749	*/
1750	int mb_lmin;
1751
1752	/**
1753	* maximum MB lagrange multipler
1754	* - encoding: Set by user.
1755	* - decoding: unused
1756	*/
1757	int mb_lmax;
1758
1759	/**
1760	*
1761	* - encoding: Set by user.
1762	* - decoding: unused
1763	*/
1764	int me_penalty_compensation;
1765
1766	/**
1767	*
1768	* - encoding: Set by user.
1769	* - decoding: unused
1770	*/
1771	int bidir_refine;
1772
1773	/**
1774	*
1775	* - encoding: Set by user.
1776	* - decoding: unused
1777	*/
1778	int brd_scale;
1779
1780	/**
1781	* minimum GOP size
1782	* - encoding: Set by user.
1783	* - decoding: unused
1784	*/
1785	int keyint_min;
1786
1787	/**
1788	* number of reference frames
1789	* - encoding: Set by user.
1790	* - decoding: Set by lavc.
1791	*/
1792	int refs;
1793
1794	/**
1795	* chroma qp offset from luma
1796	* - encoding: Set by user.
1797	* - decoding: unused
1798	*/
1799	int chromaoffset;
1800
1801	/**
1802	* Multiplied by qscale for each frame and added to scene_change_score.
1803	* - encoding: Set by user.
1804	* - decoding: unused
1805	*/
1806	int scenechange_factor;
1807
1808	/**
1809	*
1810	* Note: Value depends upon the compare function used for fullpel ME.
1811	* - encoding: Set by user.
1812	* - decoding: unused
1813	*/
1814	int mv0_threshold;
1815
1816	/**
1817	* Adjust sensitivity of b_frame_strategy 1.
1818	* - encoding: Set by user.
1819	* - decoding: unused
1820	*/
1821	int b_sensitivity;
1822
1823	/**
1824	* Chromaticity coordinates of the source primaries.
1825	* - encoding: Set by user
1826	* - decoding: Set by libavcodec
1827	*/
1828	enum AVColorPrimaries color_primaries;
1829
1830	/**
1831	* Color Transfer Characteristic.
1832	* - encoding: Set by user
1833	* - decoding: Set by libavcodec
1834	*/
1835	enum AVColorTransferCharacteristic color_trc;
1836
1837	/**
1838	* YUV colorspace type.
1839	* - encoding: Set by user
1840	* - decoding: Set by libavcodec
1841	*/
1842	enum AVColorSpace colorspace;
1843
1844	/**
1845	* MPEG vs JPEG YUV range.
1846	* - encoding: Set by user
1847	* - decoding: Set by libavcodec
1848	*/
1849	enum AVColorRange color_range;
1850
1851	/**
1852	* This defines the location of chroma samples.
1853	* - encoding: Set by user
1854	* - decoding: Set by libavcodec
1855	*/
1856	enum AVChromaLocation chroma_sample_location;
1857
1858	/**
1859	* Number of slices.
1860	* Indicates number of picture subdivisions. Used for parallelized
1861	* decoding.
1862	* - encoding: Set by user
1863	* - decoding: unused
1864	*/
1865	int slices;
1866
1867	/** Field order
1868	* - encoding: set by libavcodec
1869	* - decoding: Set by user.
1870	*/
1871	enum AVFieldOrder field_order;
1872
1873	/* audio only */
1874	int sample_rate; ///< samples per second
1875	int channels; ///< number of audio channels
1876
1877	/**
1878	* audio sample format
1879	* - encoding: Set by user.
1880	* - decoding: Set by libavcodec.
1881	*/
1882	enum AVSampleFormat sample_fmt; ///< sample format
1883
1884	/* The following data should not be initialized. */
1885	/**
1886	* Number of samples per channel in an audio frame.
1887	*
1888	* - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1889	* except the last must contain exactly frame_size samples per channel.
1890	* May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1891	* frame size is not restricted.
1892	* - decoding: may be set by some decoders to indicate constant frame size
1893	*/
1894	int frame_size;
1895
1896	/**
1897	* Frame counter, set by libavcodec.
1898	*
1899	* - decoding: total number of frames returned from the decoder so far.
1900	* - encoding: total number of frames passed to the encoder so far.
1901	*
1902	* @note the counter is not incremented if encoding/decoding resulted in
1903	* an error.
1904	*/
1905	int frame_number;
1906
1907	/**
1908	* number of bytes per packet if constant and known or 0
1909	* Used by some WAV based audio codecs.
1910	*/
1911	int block_align;
1912
1913	/**
1914	* Audio cutoff bandwidth (0 means "automatic")
1915	* - encoding: Set by user.
1916	* - decoding: unused
1917	*/
1918	int cutoff;
1919
1920	#if FF_API_REQUEST_CHANNELS
1921	/**
1922	* Decoder should decode to this many channels if it can (0 for default)
1923	* - encoding: unused
1924	* - decoding: Set by user.
1925	* @deprecated Deprecated in favor of request_channel_layout.
1926	*/
1927	attribute_deprecated int request_channels;
1928	#endif
1929
1930	/**
1931	* Audio channel layout.
1932	* - encoding: set by user.
1933	* - decoding: set by user, may be overwritten by libavcodec.
1934	*/
1935	uint64_t channel_layout;
1936
1937	/**
1938	* Request decoder to use this channel layout if it can (0 for default)
1939	* - encoding: unused
1940	* - decoding: Set by user.
1941	*/
1942	uint64_t request_channel_layout;
1943
1944	/**
1945	* Type of service that the audio stream conveys.
1946	* - encoding: Set by user.
1947	* - decoding: Set by libavcodec.
1948	*/
1949	enum AVAudioServiceType audio_service_type;
1950
1951	/**
1952	* desired sample format
1953	* - encoding: Not used.
1954	* - decoding: Set by user.
1955	* Decoder will decode to this format if it can.
1956	*/
1957	enum AVSampleFormat request_sample_fmt;
1958
1959	#if FF_API_GET_BUFFER
1960	/**
1961	* Called at the beginning of each frame to get a buffer for it.
1962	*
1963	* The function will set AVFrame.data[], AVFrame.linesize[].
1964	* AVFrame.extended_data[] must also be set, but it should be the same as
1965	* AVFrame.data[] except for planar audio with more channels than can fit
1966	* in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1967	* many data pointers as it can hold.
1968	*
1969	* if CODEC_CAP_DR1 is not set then get_buffer() must call
1970	* avcodec_default_get_buffer() instead of providing buffers allocated by
1971	* some other means.
1972	*
1973	* AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1974	* need it. avcodec_default_get_buffer() aligns the output buffer properly,
1975	* but if get_buffer() is overridden then alignment considerations should
1976	* be taken into account.
1977	*
1978	* @see avcodec_default_get_buffer()
1979	*
1980	* Video:
1981	*
1982	* If pic.reference is set then the frame will be read later by libavcodec.
1983	* avcodec_align_dimensions2() should be used to find the required width and
1984	* height, as they normally need to be rounded up to the next multiple of 16.
1985	*
1986	* If frame multithreading is used and thread_safe_callbacks is set,
1987	* it may be called from a different thread, but not from more than one at
1988	* once. Does not need to be reentrant.
1989	*
1990	* @see release_buffer(), reget_buffer()
1991	* @see avcodec_align_dimensions2()
1992	*
1993	* Audio:
1994	*
1995	* Decoders request a buffer of a particular size by setting
1996	* AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1997	* however, utilize only part of the buffer by setting AVFrame.nb_samples
1998	* to a smaller value in the output frame.
1999	*
2000	* Decoders cannot use the buffer after returning from
2001	* avcodec_decode_audio4(), so they will not call release_buffer(), as it
2002	* is assumed to be released immediately upon return. In some rare cases,
2003	* a decoder may need to call get_buffer() more than once in a single
2004	* call to avcodec_decode_audio4(). In that case, when get_buffer() is
2005	* called again after it has already been called once, the previously
2006	* acquired buffer is assumed to be released at that time and may not be
2007	* reused by the decoder.
2008	*
2009	* As a convenience, av_samples_get_buffer_size() and
2010	* av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2011	* functions to find the required data size and to fill data pointers and
2012	* linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2013	* since all planes must be the same size.
2014	*
2015	* @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2016	*
2017	* - encoding: unused
2018	* - decoding: Set by libavcodec, user can override.
2019	*
2020	* @deprecated use get_buffer2()
2021	*/
2022	attribute_deprecated
2023	int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2024
2025	/**
2026	* Called to release buffers which were allocated with get_buffer.
2027	* A released buffer can be reused in get_buffer().
2028	* pic.data[*] must be set to NULL.
2029	* May be called from a different thread if frame multithreading is used,
2030	* but not by more than one thread at once, so does not need to be reentrant.
2031	* - encoding: unused
2032	* - decoding: Set by libavcodec, user can override.
2033	*
2034	* @deprecated custom freeing callbacks should be set from get_buffer2()
2035	*/
2036	attribute_deprecated
2037	void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2038
2039	/**
2040	* Called at the beginning of a frame to get cr buffer for it.
2041	* Buffer type (size, hints) must be the same. libavcodec won't check it.
2042	* libavcodec will pass previous buffer in pic, function should return
2043	* same buffer or new buffer with old frame "painted" into it.
2044	* If pic.data[0] == NULL must behave like get_buffer().
2045	* if CODEC_CAP_DR1 is not set then reget_buffer() must call
2046	* avcodec_default_reget_buffer() instead of providing buffers allocated by
2047	* some other means.
2048	* - encoding: unused
2049	* - decoding: Set by libavcodec, user can override.
2050	*/
2051	attribute_deprecated
2052	int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2053	#endif
2054
2055	/**
2056	* This callback is called at the beginning of each frame to get data
2057	* buffer(s) for it. There may be one contiguous buffer for all the data or
2058	* there may be a buffer per each data plane or anything in between. What
2059	* this means is, you may set however many entries in buf[] you feel necessary.
2060	* Each buffer must be reference-counted using the AVBuffer API (see description
2061	* of buf[] below).
2062	*
2063	* The following fields will be set in the frame before this callback is
2064	* called:
2065	* - format
2066	* - width, height (video only)
2067	* - sample_rate, channel_layout, nb_samples (audio only)
2068	* Their values may differ from the corresponding values in
2069	* AVCodecContext. This callback must use the frame values, not the codec
2070	* context values, to calculate the required buffer size.
2071	*
2072	* This callback must fill the following fields in the frame:
2073	* - data[]
2074	* - linesize[]
2075	* - extended_data:
2076	* * if the data is planar audio with more than 8 channels, then this
2077	* callback must allocate and fill extended_data to contain all pointers
2078	* to all data planes. data[] must hold as many pointers as it can.
2079	* extended_data must be allocated with av_malloc() and will be freed in
2080	* av_frame_unref().
2081	* * otherwise exended_data must point to data
2082	* - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2083	* the frame's data and extended_data pointers must be contained in these. That
2084	* is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2085	* AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2086	* and av_buffer_ref().
2087	* - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2088	* this callback and filled with the extra buffers if there are more
2089	* buffers than buf[] can hold. extended_buf will be freed in
2090	* av_frame_unref().
2091	*
2092	* If CODEC_CAP_DR1 is not set then get_buffer2() must call
2093	* avcodec_default_get_buffer2() instead of providing buffers allocated by
2094	* some other means.
2095	*
2096	* Each data plane must be aligned to the maximum required by the target
2097	* CPU.
2098	*
2099	* @see avcodec_default_get_buffer2()
2100	*
2101	* Video:
2102	*
2103	* If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2104	* (read and/or written to if it is writable) later by libavcodec.
2105	*
2106	* If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an
2107	* edge of the size returned by avcodec_get_edge_width() on all sides.
2108	*
2109	* avcodec_align_dimensions2() should be used to find the required width and
2110	* height, as they normally need to be rounded up to the next multiple of 16.
2111	*
2112	* If frame multithreading is used and thread_safe_callbacks is set,
2113	* this callback may be called from a different thread, but not from more
2114	* than one at once. Does not need to be reentrant.
2115	*
2116	* @see avcodec_align_dimensions2()
2117	*
2118	* Audio:
2119	*
2120	* Decoders request a buffer of a particular size by setting
2121	* AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2122	* however, utilize only part of the buffer by setting AVFrame.nb_samples
2123	* to a smaller value in the output frame.
2124	*
2125	* As a convenience, av_samples_get_buffer_size() and
2126	* av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2127	* functions to find the required data size and to fill data pointers and
2128	* linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2129	* since all planes must be the same size.
2130	*
2131	* @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2132	*
2133	* - encoding: unused
2134	* - decoding: Set by libavcodec, user can override.
2135	*/
2136	int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2137
2138	/**
2139	* If non-zero, the decoded audio and video frames returned from
2140	* avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2141	* and are valid indefinitely. The caller must free them with
2142	* av_frame_unref() when they are not needed anymore.
2143	* Otherwise, the decoded frames must not be freed by the caller and are
2144	* only valid until the next decode call.
2145	*
2146	* - encoding: unused
2147	* - decoding: set by the caller before avcodec_open2().
2148	*/
2149	int refcounted_frames;
2150
2151	/* - encoding parameters */
2152	float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2153	float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2154
2155	/**
2156	* minimum quantizer
2157	* - encoding: Set by user.
2158	* - decoding: unused
2159	*/
2160	int qmin;
2161
2162	/**
2163	* maximum quantizer
2164	* - encoding: Set by user.
2165	* - decoding: unused
2166	*/
2167	int qmax;
2168
2169	/**
2170	* maximum quantizer difference between frames
2171	* - encoding: Set by user.
2172	* - decoding: unused
2173	*/
2174	int max_qdiff;
2175
2176	/**
2177	* ratecontrol qmin qmax limiting method
2178	* 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2179	* - encoding: Set by user.
2180	* - decoding: unused
2181	*/
2182	float rc_qsquish;
2183
2184	float rc_qmod_amp;
2185	int rc_qmod_freq;
2186
2187	/**
2188	* decoder bitstream buffer size
2189	* - encoding: Set by user.
2190	* - decoding: unused
2191	*/
2192	int rc_buffer_size;
2193
2194	/**
2195	* ratecontrol override, see RcOverride
2196	* - encoding: Allocated/set/freed by user.
2197	* - decoding: unused
2198	*/
2199	int rc_override_count;
2200	RcOverride *rc_override;
2201
2202	/**
2203	* rate control equation
2204	* - encoding: Set by user
2205	* - decoding: unused
2206	*/
2207	const char *rc_eq;
2208
2209	/**
2210	* maximum bitrate
2211	* - encoding: Set by user.
2212	* - decoding: unused
2213	*/
2214	int rc_max_rate;
2215
2216	/**
2217	* minimum bitrate
2218	* - encoding: Set by user.
2219	* - decoding: unused
2220	*/
2221	int rc_min_rate;
2222
2223	float rc_buffer_aggressivity;
2224
2225	/**
2226	* initial complexity for pass1 ratecontrol
2227	* - encoding: Set by user.
2228	* - decoding: unused
2229	*/
2230	float rc_initial_cplx;
2231
2232	/**
2233	* Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2234	* - encoding: Set by user.
2235	* - decoding: unused.
2236	*/
2237	float rc_max_available_vbv_use;
2238
2239	/**
2240	* Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2241	* - encoding: Set by user.
2242	* - decoding: unused.
2243	*/
2244	float rc_min_vbv_overflow_use;
2245
2246	/**
2247	* Number of bits which should be loaded into the rc buffer before decoding starts.
2248	* - encoding: Set by user.
2249	* - decoding: unused
2250	*/
2251	int rc_initial_buffer_occupancy;
2252
2253	#define FF_CODER_TYPE_VLC 0
2254	#define FF_CODER_TYPE_AC 1
2255	#define FF_CODER_TYPE_RAW 2
2256	#define FF_CODER_TYPE_RLE 3
2257	#define FF_CODER_TYPE_DEFLATE 4
2258	/**
2259	* coder type
2260	* - encoding: Set by user.
2261	* - decoding: unused
2262	*/
2263	int coder_type;
2264
2265	/**
2266	* context model
2267	* - encoding: Set by user.
2268	* - decoding: unused
2269	*/
2270	int context_model;
2271
2272	/**
2273	* minimum Lagrange multipler
2274	* - encoding: Set by user.
2275	* - decoding: unused
2276	*/
2277	int lmin;
2278
2279	/**
2280	* maximum Lagrange multipler
2281	* - encoding: Set by user.
2282	* - decoding: unused
2283	*/
2284	int lmax;
2285
2286	/**
2287	* frame skip threshold
2288	* - encoding: Set by user.
2289	* - decoding: unused
2290	*/
2291	int frame_skip_threshold;
2292
2293	/**
2294	* frame skip factor
2295	* - encoding: Set by user.
2296	* - decoding: unused
2297	*/
2298	int frame_skip_factor;
2299
2300	/**
2301	* frame skip exponent
2302	* - encoding: Set by user.
2303	* - decoding: unused
2304	*/
2305	int frame_skip_exp;
2306
2307	/**
2308	* frame skip comparison function
2309	* - encoding: Set by user.
2310	* - decoding: unused
2311	*/
2312	int frame_skip_cmp;
2313
2314	/**
2315	* trellis RD quantization
2316	* - encoding: Set by user.
2317	* - decoding: unused
2318	*/
2319	int trellis;
2320
2321	/**
2322	* - encoding: Set by user.
2323	* - decoding: unused
2324	*/
2325	int min_prediction_order;
2326
2327	/**
2328	* - encoding: Set by user.
2329	* - decoding: unused
2330	*/
2331	int max_prediction_order;
2332
2333	/**
2334	* GOP timecode frame start number
2335	* - encoding: Set by user, in non drop frame format
2336	* - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2337	*/
2338	int64_t timecode_frame_start;
2339
2340	/* The RTP callback: This function is called */
2341	/* every time the encoder has a packet to send. */
2342	/* It depends on the encoder if the data starts */
2343	/* with a Start Code (it should). H.263 does. */
2344	/* mb_nb contains the number of macroblocks */
2345	/* encoded in the RTP payload. */
2346	void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2347
2348	int rtp_payload_size; /* The size of the RTP payload: the coder will */
2349	/* do its best to deliver a chunk with size */
2350	/* below rtp_payload_size, the chunk will start */
2351	/* with a start code on some codecs like H.263. */
2352	/* This doesn't take account of any particular */
2353	/* headers inside the transmitted RTP payload. */
2354
2355	/* statistics, used for 2-pass encoding */
2356	int mv_bits;
2357	int header_bits;
2358	int i_tex_bits;
2359	int p_tex_bits;
2360	int i_count;
2361	int p_count;
2362	int skip_count;
2363	int misc_bits;
2364
2365	/**
2366	* number of bits used for the previously encoded frame
2367	* - encoding: Set by libavcodec.
2368	* - decoding: unused
2369	*/
2370	int frame_bits;
2371
2372	/**
2373	* pass1 encoding statistics output buffer
2374	* - encoding: Set by libavcodec.
2375	* - decoding: unused
2376	*/
2377	char *stats_out;
2378
2379	/**
2380	* pass2 encoding statistics input buffer
2381	* Concatenated stuff from stats_out of pass1 should be placed here.
2382	* - encoding: Allocated/set/freed by user.
2383	* - decoding: unused
2384	*/
2385	char *stats_in;
2386
2387	/**
2388	* Work around bugs in encoders which sometimes cannot be detected automatically.
2389	* - encoding: Set by user
2390	* - decoding: Set by user
2391	*/
2392	int workaround_bugs;
2393	#define FF_BUG_AUTODETECT 1 ///< autodetection
2394	#define FF_BUG_OLD_MSMPEG4 2
2395	#define FF_BUG_XVID_ILACE 4
2396	#define FF_BUG_UMP4 8
2397	#define FF_BUG_NO_PADDING 16
2398	#define FF_BUG_AMV 32
2399	#define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2400	#define FF_BUG_QPEL_CHROMA 64
2401	#define FF_BUG_STD_QPEL 128
2402	#define FF_BUG_QPEL_CHROMA2 256
2403	#define FF_BUG_DIRECT_BLOCKSIZE 512
2404	#define FF_BUG_EDGE 1024
2405	#define FF_BUG_HPEL_CHROMA 2048
2406	#define FF_BUG_DC_CLIP 4096
2407	#define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2408	#define FF_BUG_TRUNCATED 16384
2409
2410	/**
2411	* strictly follow the standard (MPEG4, ...).
2412	* - encoding: Set by user.
2413	* - decoding: Set by user.
2414	* Setting this to STRICT or higher means the encoder and decoder will
2415	* generally do stupid things, whereas setting it to unofficial or lower
2416	* will mean the encoder might produce output that is not supported by all
2417	* spec-compliant decoders. Decoders don't differentiate between normal,
2418	* unofficial and experimental (that is, they always try to decode things
2419	* when they can) unless they are explicitly asked to behave stupidly
2420	* (=strictly conform to the specs)
2421	*/
2422	int strict_std_compliance;
2423	#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2424	#define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2425	#define FF_COMPLIANCE_NORMAL 0
2426	#define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2427	#define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2428
2429	/**
2430	* error concealment flags
2431	* - encoding: unused
2432	* - decoding: Set by user.
2433	*/
2434	int error_concealment;
2435	#define FF_EC_GUESS_MVS 1
2436	#define FF_EC_DEBLOCK 2
2437
2438	/**
2439	* debug
2440	* - encoding: Set by user.
2441	* - decoding: Set by user.
2442	*/
2443	int debug;
2444	#define FF_DEBUG_PICT_INFO 1
2445	#define FF_DEBUG_RC 2
2446	#define FF_DEBUG_BITSTREAM 4
2447	#define FF_DEBUG_MB_TYPE 8
2448	#define FF_DEBUG_QP 16
2449	#define FF_DEBUG_MV 32
2450	#define FF_DEBUG_DCT_COEFF 0x00000040
2451	#define FF_DEBUG_SKIP 0x00000080
2452	#define FF_DEBUG_STARTCODE 0x00000100
2453	#define FF_DEBUG_PTS 0x00000200
2454	#define FF_DEBUG_ER 0x00000400
2455	#define FF_DEBUG_MMCO 0x00000800
2456	#define FF_DEBUG_BUGS 0x00001000
2457	#define FF_DEBUG_VIS_QP 0x00002000
2458	#define FF_DEBUG_VIS_MB_TYPE 0x00004000
2459	#define FF_DEBUG_BUFFERS 0x00008000
2460	#define FF_DEBUG_THREADS 0x00010000
2461
2462	/**
2463	* debug
2464	* - encoding: Set by user.
2465	* - decoding: Set by user.
2466	*/
2467	int debug_mv;
2468	#define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2469	#define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2470	#define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2471
2472	/**
2473	* Error recognition; may misdetect some more or less valid parts as errors.
2474	* - encoding: unused
2475	* - decoding: Set by user.
2476	*/
2477	int err_recognition;
2478
2479	/**
2480	* Verify checksums embedded in the bitstream (could be of either encoded or
2481	* decoded data, depending on the codec) and print an error message on mismatch.
2482	* If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2483	* decoder returning an error.
2484	*/
2485	#define AV_EF_CRCCHECK (1<<0)
2486	#define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2487	#define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2488	#define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2489
2490	#define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2491	#define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliancies as errors
2492	#define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2493
2494
2495	/**
2496	* opaque 64bit number (generally a PTS) that will be reordered and
2497	* output in AVFrame.reordered_opaque
2498	* @deprecated in favor of pkt_pts
2499	* - encoding: unused
2500	* - decoding: Set by user.
2501	*/
2502	int64_t reordered_opaque;
2503
2504	/**
2505	* Hardware accelerator in use
2506	* - encoding: unused.
2507	* - decoding: Set by libavcodec
2508	*/
2509	struct AVHWAccel *hwaccel;
2510
2511	/**
2512	* Hardware accelerator context.
2513	* For some hardware accelerators, a global context needs to be
2514	* provided by the user. In that case, this holds display-dependent
2515	* data FFmpeg cannot instantiate itself. Please refer to the
2516	* FFmpeg HW accelerator documentation to know how to fill this
2517	* is. e.g. for VA API, this is a struct vaapi_context.
2518	* - encoding: unused
2519	* - decoding: Set by user
2520	*/
2521	void *hwaccel_context;
2522
2523	/**
2524	* error
2525	* - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2526	* - decoding: unused
2527	*/
2528	uint64_t error[AV_NUM_DATA_POINTERS];
2529
2530	/**
2531	* DCT algorithm, see FF_DCT_* below
2532	* - encoding: Set by user.
2533	* - decoding: unused
2534	*/
2535	int dct_algo;
2536	#define FF_DCT_AUTO 0
2537	#define FF_DCT_FASTINT 1
2538	#define FF_DCT_INT 2
2539	#define FF_DCT_MMX 3
2540	#define FF_DCT_ALTIVEC 5
2541	#define FF_DCT_FAAN 6
2542
2543	/**
2544	* IDCT algorithm, see FF_IDCT_* below.
2545	* - encoding: Set by user.
2546	* - decoding: Set by user.
2547	*/
2548	int idct_algo;
2549	#define FF_IDCT_AUTO 0
2550	#define FF_IDCT_INT 1
2551	#define FF_IDCT_SIMPLE 2
2552	#define FF_IDCT_SIMPLEMMX 3
2553	#define FF_IDCT_ARM 7
2554	#define FF_IDCT_ALTIVEC 8
2555	#define FF_IDCT_SH4 9
2556	#define FF_IDCT_SIMPLEARM 10
2557	#define FF_IDCT_IPP 13
2558	#define FF_IDCT_XVIDMMX 14
2559	#define FF_IDCT_SIMPLEARMV5TE 16
2560	#define FF_IDCT_SIMPLEARMV6 17
2561	#define FF_IDCT_SIMPLEVIS 18
2562	#define FF_IDCT_FAAN 20
2563	#define FF_IDCT_SIMPLENEON 22
2564	#define FF_IDCT_SIMPLEALPHA 23
2565
2566	/**
2567	* bits per sample/pixel from the demuxer (needed for huffyuv).
2568	* - encoding: Set by libavcodec.
2569	* - decoding: Set by user.
2570	*/
2571	int bits_per_coded_sample;
2572
2573	/**
2574	* Bits per sample/pixel of internal libavcodec pixel/sample format.
2575	* - encoding: set by user.
2576	* - decoding: set by libavcodec.
2577	*/
2578	int bits_per_raw_sample;
2579
2580	#if FF_API_LOWRES
2581	/**
2582	* low resolution decoding, 1-> 1/2 size, 2->1/4 size
2583	* - encoding: unused
2584	* - decoding: Set by user.
2585	* Code outside libavcodec should access this field using:
2586	* av_codec_{get,set}_lowres(avctx)
2587	*/
2588	int lowres;
2589	#endif
2590
2591	/**
2592	* the picture in the bitstream
2593	* - encoding: Set by libavcodec.
2594	* - decoding: Set by libavcodec.
2595	*/
2596	AVFrame *coded_frame;
2597
2598	/**
2599	* thread count
2600	* is used to decide how many independent tasks should be passed to execute()
2601	* - encoding: Set by user.
2602	* - decoding: Set by user.
2603	*/
2604	int thread_count;
2605
2606	/**
2607	* Which multithreading methods to use.
2608	* Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2609	* so clients which cannot provide future frames should not use it.
2610	*
2611	* - encoding: Set by user, otherwise the default is used.
2612	* - decoding: Set by user, otherwise the default is used.
2613	*/
2614	int thread_type;
2615	#define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2616	#define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2617
2618	/**
2619	* Which multithreading methods are in use by the codec.
2620	* - encoding: Set by libavcodec.
2621	* - decoding: Set by libavcodec.
2622	*/
2623	int active_thread_type;
2624
2625	/**
2626	* Set by the client if its custom get_buffer() callback can be called
2627	* synchronously from another thread, which allows faster multithreaded decoding.
2628	* draw_horiz_band() will be called from other threads regardless of this setting.
2629	* Ignored if the default get_buffer() is used.
2630	* - encoding: Set by user.
2631	* - decoding: Set by user.
2632	*/
2633	int thread_safe_callbacks;
2634
2635	/**
2636	* The codec may call this to execute several independent things.
2637	* It will return only after finishing all tasks.
2638	* The user may replace this with some multithreaded implementation,
2639	* the default implementation will execute the parts serially.
2640	* @param count the number of things to execute
2641	* - encoding: Set by libavcodec, user can override.
2642	* - decoding: Set by libavcodec, user can override.
2643	*/
2644	int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2645
2646	/**
2647	* The codec may call this to execute several independent things.
2648	* It will return only after finishing all tasks.
2649	* The user may replace this with some multithreaded implementation,
2650	* the default implementation will execute the parts serially.
2651	* Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2652	* @param c context passed also to func
2653	* @param count the number of things to execute
2654	* @param arg2 argument passed unchanged to func
2655	* @param ret return values of executed functions, must have space for "count" values. May be NULL.
2656	* @param func function that will be called count times, with jobnr from 0 to count-1.
2657	* threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2658	* two instances of func executing at the same time will have the same threadnr.
2659	* @return always 0 currently, but code should handle a future improvement where when any call to func
2660	* returns < 0 no further calls to func may be done and < 0 is returned.
2661	* - encoding: Set by libavcodec, user can override.
2662	* - decoding: Set by libavcodec, user can override.
2663	*/
2664	int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2665
2666	/**
2667	* thread opaque
2668	* Can be used by execute() to store some per AVCodecContext stuff.
2669	* - encoding: set by execute()
2670	* - decoding: set by execute()
2671	*/
2672	void *thread_opaque;
2673
2674	/**
2675	* noise vs. sse weight for the nsse comparsion function
2676	* - encoding: Set by user.
2677	* - decoding: unused
2678	*/
2679	int nsse_weight;
2680
2681	/**
2682	* profile
2683	* - encoding: Set by user.
2684	* - decoding: Set by libavcodec.
2685	*/
2686	int profile;
2687	#define FF_PROFILE_UNKNOWN -99
2688	#define FF_PROFILE_RESERVED -100
2689
2690	#define FF_PROFILE_AAC_MAIN 0
2691	#define FF_PROFILE_AAC_LOW 1
2692	#define FF_PROFILE_AAC_SSR 2
2693	#define FF_PROFILE_AAC_LTP 3
2694	#define FF_PROFILE_AAC_HE 4
2695	#define FF_PROFILE_AAC_HE_V2 28
2696	#define FF_PROFILE_AAC_LD 22
2697	#define FF_PROFILE_AAC_ELD 38
2698	#define FF_PROFILE_MPEG2_AAC_LOW 128
2699	#define FF_PROFILE_MPEG2_AAC_HE 131
2700
2701	#define FF_PROFILE_DTS 20
2702	#define FF_PROFILE_DTS_ES 30
2703	#define FF_PROFILE_DTS_96_24 40
2704	#define FF_PROFILE_DTS_HD_HRA 50
2705	#define FF_PROFILE_DTS_HD_MA 60
2706
2707	#define FF_PROFILE_MPEG2_422 0
2708	#define FF_PROFILE_MPEG2_HIGH 1
2709	#define FF_PROFILE_MPEG2_SS 2
2710	#define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2711	#define FF_PROFILE_MPEG2_MAIN 4
2712	#define FF_PROFILE_MPEG2_SIMPLE 5
2713
2714	#define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2715	#define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2716
2717	#define FF_PROFILE_H264_BASELINE 66
2718	#define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2719	#define FF_PROFILE_H264_MAIN 77
2720	#define FF_PROFILE_H264_EXTENDED 88
2721	#define FF_PROFILE_H264_HIGH 100
2722	#define FF_PROFILE_H264_HIGH_10 110
2723	#define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2724	#define FF_PROFILE_H264_HIGH_422 122
2725	#define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2726	#define FF_PROFILE_H264_HIGH_444 144
2727	#define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2728	#define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2729	#define FF_PROFILE_H264_CAVLC_444 44
2730
2731	#define FF_PROFILE_VC1_SIMPLE 0
2732	#define FF_PROFILE_VC1_MAIN 1
2733	#define FF_PROFILE_VC1_COMPLEX 2
2734	#define FF_PROFILE_VC1_ADVANCED 3
2735
2736	#define FF_PROFILE_MPEG4_SIMPLE 0
2737	#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2738	#define FF_PROFILE_MPEG4_CORE 2
2739	#define FF_PROFILE_MPEG4_MAIN 3
2740	#define FF_PROFILE_MPEG4_N_BIT 4
2741	#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2742	#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2743	#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2744	#define FF_PROFILE_MPEG4_HYBRID 8
2745	#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2746	#define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2747	#define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2748	#define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2749	#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2750	#define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2751	#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2752
2753	#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2754	#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2755	#define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2756	#define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2757	#define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2758
2759	/**
2760	* level
2761	* - encoding: Set by user.
2762	* - decoding: Set by libavcodec.
2763	*/
2764	int level;
2765	#define FF_LEVEL_UNKNOWN -99
2766
2767	/**
2768	* Skip loop filtering for selected frames.
2769	* - encoding: unused
2770	* - decoding: Set by user.
2771	*/
2772	enum AVDiscard skip_loop_filter;
2773
2774	/**
2775	* Skip IDCT/dequantization for selected frames.
2776	* - encoding: unused
2777	* - decoding: Set by user.
2778	*/
2779	enum AVDiscard skip_idct;
2780
2781	/**
2782	* Skip decoding for selected frames.
2783	* - encoding: unused
2784	* - decoding: Set by user.
2785	*/
2786	enum AVDiscard skip_frame;
2787
2788	/**
2789	* Header containing style information for text subtitles.
2790	* For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2791	* [Script Info] and [V4+ Styles] section, plus the [Events] line and
2792	* the Format line following. It shouldn't include any Dialogue line.
2793	* - encoding: Set/allocated/freed by user (before avcodec_open2())
2794	* - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2795	*/
2796	uint8_t *subtitle_header;
2797	int subtitle_header_size;
2798
2799	/**
2800	* Simulates errors in the bitstream to test error concealment.
2801	* - encoding: Set by user.
2802	* - decoding: unused
2803	*/
2804	int error_rate;
2805
2806	/**
2807	* Current packet as passed into the decoder, to avoid having
2808	* to pass the packet into every function. Currently only valid
2809	* inside lavc and get/release_buffer callbacks.
2810	* - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2811	* - encoding: unused
2812	*/
2813	AVPacket *pkt;
2814
2815	/**
2816	* VBV delay coded in the last frame (in periods of a 27 MHz clock).
2817	* Used for compliant TS muxing.
2818	* - encoding: Set by libavcodec.
2819	* - decoding: unused.
2820	*/
2821	uint64_t vbv_delay;
2822
2823	/**
2824	* Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
2825	* Code outside libavcodec should access this field using:
2826	* av_codec_{get,set}_pkt_timebase(avctx)
2827	* - encoding unused.
2828	* - decoding set by user.
2829	*/
2830	AVRational pkt_timebase;
2831
2832	/**
2833	* AVCodecDescriptor
2834	* Code outside libavcodec should access this field using:
2835	* av_codec_{get,set}_codec_descriptor(avctx)
2836	* - encoding: unused.
2837	* - decoding: set by libavcodec.
2838	*/
2839	const AVCodecDescriptor *codec_descriptor;
2840
2841	#if !FF_API_LOWRES
2842	/**
2843	* low resolution decoding, 1-> 1/2 size, 2->1/4 size
2844	* - encoding: unused
2845	* - decoding: Set by user.
2846	* Code outside libavcodec should access this field using:
2847	* av_codec_{get,set}_lowres(avctx)
2848	*/
2849	int lowres;
2850	#endif
2851
2852	/**
2853	* Current statistics for PTS correction.
2854	* - decoding: maintained and used by libavcodec, not intended to be used by user apps
2855	* - encoding: unused
2856	*/
2857	int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2858	int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2859	int64_t pts_correction_last_pts; /// PTS of the last frame
2860	int64_t pts_correction_last_dts; /// DTS of the last frame
2861
2862	/**
2863	* Character encoding of the input subtitles file.
2864	* - decoding: set by user
2865	* - encoding: unused
2866	*/
2867	char *sub_charenc;
2868
2869	/**
2870	* Subtitles character encoding mode. Formats or codecs might be adjusting
2871	* this setting (if they are doing the conversion themselves for instance).
2872	* - decoding: set by libavcodec
2873	* - encoding: unused
2874	*/
2875	int sub_charenc_mode;
2876	#define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
2877	#define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
2878	#define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
2879
2880	/**
2881	* Skip processing alpha if supported by codec.
2882	* Note that if the format uses pre-multiplied alpha (common with VP6,
2883	* and recommended due to better video quality/compression)
2884	* the image will look as if alpha-blended onto a black background.
2885	* However for formats that do not use pre-multiplied alpha
2886	* there might be serious artefacts (though e.g. libswscale currently
2887	* assumes pre-multiplied alpha anyway).
2888	* Code outside libavcodec should access this field using AVOptions
2889	*
2890	* - decoding: set by user
2891	* - encoding: unused
2892	*/
2893	int skip_alpha;
2894
2895	/**
2896	* Number of samples to skip after a discontinuity
2897	* - decoding: unused
2898	* - encoding: set by libavcodec
2899	*/
2900	int seek_preroll;
2901	} AVCodecContext;
2902
2903	AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
2904	void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
2905
2906	const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
2907	void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
2908
2909	int av_codec_get_lowres(const AVCodecContext *avctx);
2910	void av_codec_set_lowres(AVCodecContext *avctx, int val);
2911
2912	int av_codec_get_seek_preroll(const AVCodecContext *avctx);
2913	void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
2914
2915	/**
2916	* AVProfile.
2917	*/
2918	typedef struct AVProfile {
2919	int profile;
2920	const char *name; ///< short name for the profile
2921	} AVProfile;
2922
2923	typedef struct AVCodecDefault AVCodecDefault;
2924
2925	struct AVSubtitle;
2926
2927	/**
2928	* AVCodec.
2929	*/
2930	typedef struct AVCodec {
2931	/**
2932	* Name of the codec implementation.
2933	* The name is globally unique among encoders and among decoders (but an
2934	* encoder and a decoder can share the same name).
2935	* This is the primary way to find a codec from the user perspective.
2936	*/
2937	const char *name;
2938	/**
2939	* Descriptive name for the codec, meant to be more human readable than name.
2940	* You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2941	*/
2942	const char *long_name;
2943	enum AVMediaType type;
2944	enum AVCodecID id;
2945	/**
2946	* Codec capabilities.
2947	* see CODEC_CAP_*
2948	*/
2949	int capabilities;
2950	const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2951	const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2952	const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2953	const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2954	const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2955	#if FF_API_LOWRES
2956	uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
2957	#endif
2958	const AVClass *priv_class; ///< AVClass for the private context
2959	const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2960
2961	/*****************************************************************
2962	* No fields below this line are part of the public API. They
2963	* may not be used outside of libavcodec and can be changed and
2964	* removed at will.
2965	* New public fields should be added right above.
2966	*****************************************************************
2967	*/
2968	int priv_data_size;
2969	struct AVCodec *next;
2970	/**
2971	* @name Frame-level threading support functions
2972	* @{
2973	*/
2974	/**
2975	* If defined, called on thread contexts when they are created.
2976	* If the codec allocates writable tables in init(), re-allocate them here.
2977	* priv_data will be set to a copy of the original.
2978	*/
2979	int (*init_thread_copy)(AVCodecContext *);
2980	/**
2981	* Copy necessary context variables from a previous thread context to the current one.
2982	* If not defined, the next thread will start automatically; otherwise, the codec
2983	* must call ff_thread_finish_setup().
2984	*
2985	* dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2986	*/
2987	int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2988	/** @} */
2989
2990	/**
2991	* Private codec-specific defaults.
2992	*/
2993	const AVCodecDefault *defaults;
2994
2995	/**
2996	* Initialize codec static data, called from avcodec_register().
2997	*/
2998	void (*init_static_data)(struct AVCodec *codec);
2999
3000	int (*init)(AVCodecContext *);
3001	int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3002	const struct AVSubtitle *sub);
3003	/**
3004	* Encode data to an AVPacket.
3005	*
3006	* @param avctx codec context
3007	* @param avpkt output AVPacket (may contain a user-provided buffer)
3008	* @param[in] frame AVFrame containing the raw data to be encoded
3009	* @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3010	* non-empty packet was returned in avpkt.
3011	* @return 0 on success, negative error code on failure
3012	*/
3013	int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3014	int *got_packet_ptr);
3015	int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3016	int (*close)(AVCodecContext *);
3017	/**
3018	* Flush buffers.
3019	* Will be called when seeking
3020	*/
3021	void (*flush)(AVCodecContext *);
3022	} AVCodec;
3023
3024	int av_codec_get_max_lowres(const AVCodec *codec);
3025
3026	/**
3027	* AVHWAccel.
3028	*/
3029	typedef struct AVHWAccel {
3030	/**
3031	* Name of the hardware accelerated codec.
3032	* The name is globally unique among encoders and among decoders (but an
3033	* encoder and a decoder can share the same name).
3034	*/
3035	const char *name;
3036
3037	/**
3038	* Type of codec implemented by the hardware accelerator.
3039	*
3040	* See AVMEDIA_TYPE_xxx
3041	*/
3042	enum AVMediaType type;
3043
3044	/**
3045	* Codec implemented by the hardware accelerator.
3046	*
3047	* See AV_CODEC_ID_xxx
3048	*/
3049	enum AVCodecID id;
3050
3051	/**
3052	* Supported pixel format.
3053	*
3054	* Only hardware accelerated formats are supported here.
3055	*/
3056	enum AVPixelFormat pix_fmt;
3057
3058	/**
3059	* Hardware accelerated codec capabilities.
3060	* see FF_HWACCEL_CODEC_CAP_*
3061	*/
3062	int capabilities;
3063
3064	struct AVHWAccel *next;
3065
3066	/**
3067	* Called at the beginning of each frame or field picture.
3068	*
3069	* Meaningful frame information (codec specific) is guaranteed to
3070	* be parsed at this point. This function is mandatory.
3071	*
3072	* Note that buf can be NULL along with buf_size set to 0.
3073	* Otherwise, this means the whole frame is available at this point.
3074	*
3075	* @param avctx the codec context
3076	* @param buf the frame data buffer base
3077	* @param buf_size the size of the frame in bytes
3078	* @return zero if successful, a negative value otherwise
3079	*/
3080	int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3081
3082	/**
3083	* Callback for each slice.
3084	*
3085	* Meaningful slice information (codec specific) is guaranteed to
3086	* be parsed at this point. This function is mandatory.
3087	*
3088	* @param avctx the codec context
3089	* @param buf the slice data buffer base
3090	* @param buf_size the size of the slice in bytes
3091	* @return zero if successful, a negative value otherwise
3092	*/
3093	int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3094
3095	/**
3096	* Called at the end of each frame or field picture.
3097	*
3098	* The whole picture is parsed at this point and can now be sent
3099	* to the hardware accelerator. This function is mandatory.
3100	*
3101	* @param avctx the codec context
3102	* @return zero if successful, a negative value otherwise
3103	*/
3104	int (*end_frame)(AVCodecContext *avctx);
3105
3106	/**
3107	* Size of HW accelerator private data.
3108	*
3109	* Private data is allocated with av_mallocz() before
3110	* AVCodecContext.get_buffer() and deallocated after
3111	* AVCodecContext.release_buffer().
3112	*/
3113	int priv_data_size;
3114	} AVHWAccel;
3115
3116	/**
3117	* @defgroup lavc_picture AVPicture
3118	*
3119	* Functions for working with AVPicture
3120	* @{
3121	*/
3122
3123	/**
3124	* Picture data structure.
3125	*
3126	* Up to four components can be stored into it, the last component is
3127	* alpha.
3128	*/
3129	typedef struct AVPicture {
3130	uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3131	int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3132	} AVPicture;
3133
3134	/**
3135	* @}
3136	*/
3137
3138	enum AVSubtitleType {
3139	SUBTITLE_NONE,
3140
3141	SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3142
3143	/**
3144	* Plain text, the text field must be set by the decoder and is
3145	* authoritative. ass and pict fields may contain approximations.
3146	*/
3147	SUBTITLE_TEXT,
3148
3149	/**
3150	* Formatted text, the ass field must be set by the decoder and is
3151	* authoritative. pict and text fields may contain approximations.
3152	*/
3153	SUBTITLE_ASS,
3154	};
3155
3156	#define AV_SUBTITLE_FLAG_FORCED 0x00000001
3157
3158	typedef struct AVSubtitleRect {
3159	int x; ///< top left corner of pict, undefined when pict is not set
3160	int y; ///< top left corner of pict, undefined when pict is not set
3161	int w; ///< width of pict, undefined when pict is not set
3162	int h; ///< height of pict, undefined when pict is not set
3163	int nb_colors; ///< number of colors in pict, undefined when pict is not set
3164
3165	/**
3166	* data+linesize for the bitmap of this subtitle.
3167	* can be set for text/ass as well once they where rendered
3168	*/
3169	AVPicture pict;
3170	enum AVSubtitleType type;
3171
3172	char *text; ///< 0 terminated plain UTF-8 text
3173
3174	/**
3175	* 0 terminated ASS/SSA compatible event line.
3176	* The presentation of this is unaffected by the other values in this
3177	* struct.
3178	*/
3179	char *ass;
3180
3181	int flags;
3182	} AVSubtitleRect;
3183
3184	typedef struct AVSubtitle {
3185	uint16_t format; /* 0 = graphics */
3186	uint32_t start_display_time; /* relative to packet pts, in ms */
3187	uint32_t end_display_time; /* relative to packet pts, in ms */
3188	unsigned num_rects;
3189	AVSubtitleRect **rects;
3190	int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3191	} AVSubtitle;
3192
3193	/**
3194	* If c is NULL, returns the first registered codec,
3195	* if c is non-NULL, returns the next registered codec after c,
3196	* or NULL if c is the last one.
3197	*/
3198	AVCodec *av_codec_next(const AVCodec *c);
3199
3200	/**
3201	* Return the LIBAVCODEC_VERSION_INT constant.
3202	*/
3203	unsigned avcodec_version(void);
3204
3205	/**
3206	* Return the libavcodec build-time configuration.
3207	*/
3208	const char *avcodec_configuration(void);
3209
3210	/**
3211	* Return the libavcodec license.
3212	*/
3213	const char *avcodec_license(void);
3214
3215	/**
3216	* Register the codec codec and initialize libavcodec.
3217	*
3218	* @warning either this function or avcodec_register_all() must be called
3219	* before any other libavcodec functions.
3220	*
3221	* @see avcodec_register_all()
3222	*/
3223	void avcodec_register(AVCodec *codec);
3224
3225	/**
3226	* Register all the codecs, parsers and bitstream filters which were enabled at
3227	* configuration time. If you do not call this function you can select exactly
3228	* which formats you want to support, by using the individual registration
3229	* functions.
3230	*
3231	* @see avcodec_register
3232	* @see av_register_codec_parser
3233	* @see av_register_bitstream_filter
3234	*/
3235	void avcodec_register_all(void);
3236
3237
3238	#if FF_API_ALLOC_CONTEXT
3239	/**
3240	* Allocate an AVCodecContext and set its fields to default values. The
3241	* resulting struct can be deallocated by simply calling av_free().
3242	*
3243	* @return An AVCodecContext filled with default values or NULL on failure.
3244	* @see avcodec_get_context_defaults
3245	*
3246	* @deprecated use avcodec_alloc_context3()
3247	*/
3248	attribute_deprecated
3249	AVCodecContext *avcodec_alloc_context(void);
3250
3251	/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3252	* we WILL change its arguments and name a few times! */
3253	attribute_deprecated
3254	AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3255
3256	/**
3257	* Set the fields of the given AVCodecContext to default values.
3258	*
3259	* @param s The AVCodecContext of which the fields should be set to default values.
3260	* @deprecated use avcodec_get_context_defaults3
3261	*/
3262	attribute_deprecated
3263	void avcodec_get_context_defaults(AVCodecContext *s);
3264
3265	/** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3266	* we WILL change its arguments and name a few times! */
3267	attribute_deprecated
3268	void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3269	#endif
3270
3271	/**
3272	* Allocate an AVCodecContext and set its fields to default values. The
3273	* resulting struct can be deallocated by calling avcodec_close() on it followed
3274	* by av_free().
3275	*
3276	* @param codec if non-NULL, allocate private data and initialize defaults
3277	* for the given codec. It is illegal to then call avcodec_open2()
3278	* with a different codec.
3279	* If NULL, then the codec-specific defaults won't be initialized,
3280	* which may result in suboptimal default settings (this is
3281	* important mainly for encoders, e.g. libx264).
3282	*
3283	* @return An AVCodecContext filled with default values or NULL on failure.
3284	* @see avcodec_get_context_defaults
3285	*/
3286	AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3287
3288	/**
3289	* Set the fields of the given AVCodecContext to default values corresponding
3290	* to the given codec (defaults may be codec-dependent).
3291	*
3292	* Do not call this function if a non-NULL codec has been passed
3293	* to avcodec_alloc_context3() that allocated this AVCodecContext.
3294	* If codec is non-NULL, it is illegal to call avcodec_open2() with a
3295	* different codec on this AVCodecContext.
3296	*/
3297	int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3298
3299	/**
3300	* Get the AVClass for AVCodecContext. It can be used in combination with
3301	* AV_OPT_SEARCH_FAKE_OBJ for examining options.
3302	*
3303	* @see av_opt_find().
3304	*/
3305	const AVClass *avcodec_get_class(void);
3306
3307	/**
3308	* Get the AVClass for AVFrame. It can be used in combination with
3309	* AV_OPT_SEARCH_FAKE_OBJ for examining options.
3310	*
3311	* @see av_opt_find().
3312	*/
3313	const AVClass *avcodec_get_frame_class(void);
3314
3315	/**
3316	* Get the AVClass for AVSubtitleRect. It can be used in combination with
3317	* AV_OPT_SEARCH_FAKE_OBJ for examining options.
3318	*
3319	* @see av_opt_find().
3320	*/
3321	const AVClass *avcodec_get_subtitle_rect_class(void);
3322
3323	/**
3324	* Copy the settings of the source AVCodecContext into the destination
3325	* AVCodecContext. The resulting destination codec context will be
3326	* unopened, i.e. you are required to call avcodec_open2() before you
3327	* can use this AVCodecContext to decode/encode video/audio data.
3328	*
3329	* @param dest target codec context, should be initialized with
3330	* avcodec_alloc_context3(NULL), but otherwise uninitialized
3331	* @param src source codec context
3332	* @return AVERROR() on error (e.g. memory allocation error), 0 on success
3333	*/
3334	int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3335
3336	/**
3337	* Allocate an AVFrame and set its fields to default values. The resulting
3338	* struct must be freed using avcodec_free_frame().
3339	*
3340	* @return An AVFrame filled with default values or NULL on failure.
3341	* @see avcodec_get_frame_defaults
3342	*/
3343	AVFrame *avcodec_alloc_frame(void);
3344
3345	/**
3346	* Set the fields of the given AVFrame to default values.
3347	*
3348	* @param frame The AVFrame of which the fields should be set to default values.
3349	*/
3350	void avcodec_get_frame_defaults(AVFrame *frame);
3351
3352	/**
3353	* Free the frame and any dynamically allocated objects in it,
3354	* e.g. extended_data.
3355	*
3356	* @param frame frame to be freed. The pointer will be set to NULL.
3357	*
3358	* @warning this function does NOT free the data buffers themselves
3359	* (it does not know how, since they might have been allocated with
3360	* a custom get_buffer()).
3361	*/
3362	void avcodec_free_frame(AVFrame **frame);
3363
3364	#if FF_API_AVCODEC_OPEN
3365	/**
3366	* Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3367	* function the context has to be allocated.
3368	*
3369	* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3370	* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3371	* retrieving a codec.
3372	*
3373	* @warning This function is not thread safe!
3374	*
3375	* @code
3376	* avcodec_register_all();
3377	* codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3378	* if (!codec)
3379	* exit(1);
3380	*
3381	* context = avcodec_alloc_context3(codec);
3382	*
3383	* if (avcodec_open(context, codec) < 0)
3384	* exit(1);
3385	* @endcode
3386	*
3387	* @param avctx The context which will be set up to use the given codec.
3388	* @param codec The codec to use within the context.
3389	* @return zero on success, a negative value on error
3390	* @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3391	*
3392	* @deprecated use avcodec_open2
3393	*/
3394	attribute_deprecated
3395	int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3396	#endif
3397
3398	/**
3399	* Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3400	* function the context has to be allocated with avcodec_alloc_context3().
3401	*
3402	* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3403	* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3404	* retrieving a codec.
3405	*
3406	* @warning This function is not thread safe!
3407	*
3408	* @code
3409	* avcodec_register_all();
3410	* av_dict_set(&opts, "b", "2.5M", 0);
3411	* codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3412	* if (!codec)
3413	* exit(1);
3414	*
3415	* context = avcodec_alloc_context3(codec);
3416	*
3417	* if (avcodec_open2(context, codec, opts) < 0)
3418	* exit(1);
3419	* @endcode
3420	*
3421	* @param avctx The context to initialize.
3422	* @param codec The codec to open this context for. If a non-NULL codec has been
3423	* previously passed to avcodec_alloc_context3() or
3424	* avcodec_get_context_defaults3() for this context, then this
3425	* parameter MUST be either NULL or equal to the previously passed
3426	* codec.
3427	* @param options A dictionary filled with AVCodecContext and codec-private options.
3428	* On return this object will be filled with options that were not found.
3429	*
3430	* @return zero on success, a negative value on error
3431	* @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3432	* av_dict_set(), av_opt_find().
3433	*/
3434	int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3435
3436	/**
3437	* Close a given AVCodecContext and free all the data associated with it
3438	* (but not the AVCodecContext itself).
3439	*
3440	* Calling this function on an AVCodecContext that hasn't been opened will free
3441	* the codec-specific data allocated in avcodec_alloc_context3() /
3442	* avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3443	* do nothing.
3444	*/
3445	int avcodec_close(AVCodecContext *avctx);
3446
3447	/**
3448	* Free all allocated data in the given subtitle struct.
3449	*
3450	* @param sub AVSubtitle to free.
3451	*/
3452	void avsubtitle_free(AVSubtitle *sub);
3453
3454	/**
3455	* @}
3456	*/
3457
3458	/**
3459	* @addtogroup lavc_packet
3460	* @{
3461	*/
3462
3463	#if FF_API_DESTRUCT_PACKET
3464	/**
3465	* Default packet destructor.
3466	* @deprecated use the AVBuffer API instead
3467	*/
3468	attribute_deprecated
3469	void av_destruct_packet(AVPacket *pkt);
3470	#endif
3471
3472	/**
3473	* Initialize optional fields of a packet with default values.
3474	*
3475	* Note, this does not touch the data and size members, which have to be
3476	* initialized separately.
3477	*
3478	* @param pkt packet
3479	*/
3480	void av_init_packet(AVPacket *pkt);
3481
3482	/**
3483	* Allocate the payload of a packet and initialize its fields with
3484	* default values.
3485	*
3486	* @param pkt packet
3487	* @param size wanted payload size
3488	* @return 0 if OK, AVERROR_xxx otherwise
3489	*/
3490	int av_new_packet(AVPacket *pkt, int size);
3491
3492	/**
3493	* Reduce packet size, correctly zeroing padding
3494	*
3495	* @param pkt packet
3496	* @param size new size
3497	*/
3498	void av_shrink_packet(AVPacket *pkt, int size);
3499
3500	/**
3501	* Increase packet size, correctly zeroing padding
3502	*
3503	* @param pkt packet
3504	* @param grow_by number of bytes by which to increase the size of the packet
3505	*/
3506	int av_grow_packet(AVPacket *pkt, int grow_by);
3507
3508	/**
3509	* Initialize a reference-counted packet from av_malloc()ed data.
3510	*
3511	* @param pkt packet to be initialized. This function will set the data, size,
3512	* buf and destruct fields, all others are left untouched.
3513	* @param data Data allocated by av_malloc() to be used as packet data. If this
3514	* function returns successfully, the data is owned by the underlying AVBuffer.
3515	* The caller may not access the data through other means.
3516	* @param size size of data in bytes, without the padding. I.e. the full buffer
3517	* size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3518	*
3519	* @return 0 on success, a negative AVERROR on error
3520	*/
3521	int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3522
3523	/**
3524	* @warning This is a hack - the packet memory allocation stuff is broken. The
3525	* packet is allocated if it was not really allocated.
3526	*/
3527	int av_dup_packet(AVPacket *pkt);
3528
3529	/**
3530	* Copy packet, including contents
3531	*
3532	* @return 0 on success, negative AVERROR on fail
3533	*/
3534	int av_copy_packet(AVPacket *dst, AVPacket *src);
3535
3536	/**
3537	* Copy packet side data
3538	*
3539	* @return 0 on success, negative AVERROR on fail
3540	*/
3541	int av_copy_packet_side_data(AVPacket *dst, AVPacket *src);
3542
3543	/**
3544	* Free a packet.
3545	*
3546	* @param pkt packet to free
3547	*/
3548	void av_free_packet(AVPacket *pkt);
3549
3550	/**
3551	* Allocate new information of a packet.
3552	*
3553	* @param pkt packet
3554	* @param type side information type
3555	* @param size side information size
3556	* @return pointer to fresh allocated data or NULL otherwise
3557	*/
3558	uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3559	int size);
3560
3561	/**
3562	* Shrink the already allocated side data buffer
3563	*
3564	* @param pkt packet
3565	* @param type side information type
3566	* @param size new side information size
3567	* @return 0 on success, < 0 on failure
3568	*/
3569	int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3570	int size);
3571
3572	/**
3573	* Get side information from packet.
3574	*
3575	* @param pkt packet
3576	* @param type desired side information type
3577	* @param size pointer for side information size to store (optional)
3578	* @return pointer to data if present or NULL otherwise
3579	*/
3580	uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3581	int *size);
3582
3583	int av_packet_merge_side_data(AVPacket *pkt);
3584
3585	int av_packet_split_side_data(AVPacket *pkt);
3586
3587
3588	/**
3589	* Convenience function to free all the side data stored.
3590	* All the other fields stay untouched.
3591	*
3592	* @param pkt packet
3593	*/
3594	void av_packet_free_side_data(AVPacket *pkt);
3595
3596	/**
3597	* Setup a new reference to the data described by a given packet
3598	*
3599	* If src is reference-counted, setup dst as a new reference to the
3600	* buffer in src. Otherwise allocate a new buffer in dst and copy the
3601	* data from src into it.
3602	*
3603	* All the other fields are copied from src.
3604	*
3605	* @see av_packet_unref
3606	*
3607	* @param dst Destination packet
3608	* @param src Source packet
3609	*
3610	* @return 0 on success, a negative AVERROR on error.
3611	*/
3612	int av_packet_ref(AVPacket *dst, AVPacket *src);
3613
3614	/**
3615	* Wipe the packet.
3616	*
3617	* Unreference the buffer referenced by the packet and reset the
3618	* remaining packet fields to their default values.
3619	*
3620	* @param pkt The packet to be unreferenced.
3621	*/
3622	void av_packet_unref(AVPacket *pkt);
3623
3624	/**
3625	* Move every field in src to dst and reset src.
3626	*
3627	* @see av_packet_unref
3628	*
3629	* @param src Source packet, will be reset
3630	* @param dst Destination packet
3631	*/
3632	void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3633
3634	/**
3635	* Copy only "properties" fields from src to dst.
3636	*
3637	* Properties for the purpose of this function are all the fields
3638	* beside those related to the packet data (buf, data, size)
3639	*
3640	* @param dst Destination packet
3641	* @param src Source packet
3642	*
3643	* @return 0 on success AVERROR on failure.
3644	*
3645	*/
3646	int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3647
3648	/**
3649	* @}
3650	*/
3651
3652	/**
3653	* @addtogroup lavc_decoding
3654	* @{
3655	*/
3656
3657	/**
3658	* Find a registered decoder with a matching codec ID.
3659	*
3660	* @param id AVCodecID of the requested decoder
3661	* @return A decoder if one was found, NULL otherwise.
3662	*/
3663	AVCodec *avcodec_find_decoder(enum AVCodecID id);
3664
3665	/**
3666	* Find a registered decoder with the specified name.
3667	*
3668	* @param name name of the requested decoder
3669	* @return A decoder if one was found, NULL otherwise.
3670	*/
3671	AVCodec *avcodec_find_decoder_by_name(const char *name);
3672
3673	#if FF_API_GET_BUFFER
3674	attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3675	attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3676	attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3677	#endif
3678
3679	/**
3680	* The default callback for AVCodecContext.get_buffer2(). It is made public so
3681	* it can be called by custom get_buffer2() implementations for decoders without
3682	* CODEC_CAP_DR1 set.
3683	*/
3684	int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3685
3686	/**
3687	* Return the amount of padding in pixels which the get_buffer callback must
3688	* provide around the edge of the image for codecs which do not have the
3689	* CODEC_FLAG_EMU_EDGE flag.
3690	*
3691	* @return Required padding in pixels.
3692	*/
3693	unsigned avcodec_get_edge_width(void);
3694
3695	/**
3696	* Modify width and height values so that they will result in a memory
3697	* buffer that is acceptable for the codec if you do not use any horizontal
3698	* padding.
3699	*
3700	* May only be used if a codec with CODEC_CAP_DR1 has been opened.
3701	* If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3702	* according to avcodec_get_edge_width() before.
3703	*/
3704	void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3705
3706	/**
3707	* Modify width and height values so that they will result in a memory
3708	* buffer that is acceptable for the codec if you also ensure that all
3709	* line sizes are a multiple of the respective linesize_align[i].
3710	*
3711	* May only be used if a codec with CODEC_CAP_DR1 has been opened.
3712	* If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3713	* according to avcodec_get_edge_width() before.
3714	*/
3715	void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3716	int linesize_align[AV_NUM_DATA_POINTERS]);
3717
3718	/**
3719	* Converts AVChromaLocation to swscale x/y chroma position.
3720	*
3721	* The positions represent the chroma (0,0) position in a coordinates system
3722	* with luma (0,0) representing the origin and luma(1,1) representing 256,256
3723	*
3724	* @param xpos horizontal chroma sample position
3725	* @param ypos vertical chroma sample position
3726	*/
3727	int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
3728
3729	/**
3730	* Converts swscale x/y chroma position to AVChromaLocation.
3731	*
3732	* The positions represent the chroma (0,0) position in a coordinates system
3733	* with luma (0,0) representing the origin and luma(1,1) representing 256,256
3734	*
3735	* @param xpos horizontal chroma sample position
3736	* @param ypos vertical chroma sample position
3737	*/
3738	enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
3739
3740	#if FF_API_OLD_DECODE_AUDIO
3741	/**
3742	* Wrapper function which calls avcodec_decode_audio4.
3743	*
3744	* @deprecated Use avcodec_decode_audio4 instead.
3745	*
3746	* Decode the audio frame of size avpkt->size from avpkt->data into samples.
3747	* Some decoders may support multiple frames in a single AVPacket, such
3748	* decoders would then just decode the first frame. In this case,
3749	* avcodec_decode_audio3 has to be called again with an AVPacket that contains
3750	* the remaining data in order to decode the second frame etc.
3751	* If no frame
3752	* could be outputted, frame_size_ptr is zero. Otherwise, it is the
3753	* decompressed frame size in bytes.
3754	*
3755	* @warning You must set frame_size_ptr to the allocated size of the
3756	* output buffer before calling avcodec_decode_audio3().
3757	*
3758	* @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3759	* the actual read bytes because some optimized bitstream readers read 32 or 64
3760	* bits at once and could read over the end.
3761	*
3762	* @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3763	* no overreading happens for damaged MPEG streams.
3764	*
3765	* @warning You must not provide a custom get_buffer() when using
3766	* avcodec_decode_audio3(). Doing so will override it with
3767	* avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3768	* which does allow the application to provide a custom get_buffer().
3769	*
3770	* @note You might have to align the input buffer avpkt->data and output buffer
3771	* samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3772	* necessary at all, on others it won't work at all if not aligned and on others
3773	* it will work but it will have an impact on performance.
3774	*
3775	* In practice, avpkt->data should have 4 byte alignment at minimum and
3776	* samples should be 16 byte aligned unless the CPU doesn't need it
3777	* (AltiVec and SSE do).
3778	*
3779	* @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3780	* between input and output, these need to be fed with avpkt->data=NULL,
3781	* avpkt->size=0 at the end to return the remaining frames.
3782	*
3783	* @param avctx the codec context
3784	* @param[out] samples the output buffer, sample type in avctx->sample_fmt
3785	* If the sample format is planar, each channel plane will
3786	* be the same size, with no padding between channels.
3787	* @param[in,out] frame_size_ptr the output buffer size in bytes
3788	* @param[in] avpkt The input AVPacket containing the input buffer.
3789	* You can create such packet with av_init_packet() and by then setting
3790	* data and size, some decoders might in addition need other fields.
3791	* All decoders are designed to use the least fields possible though.
3792	* @return On error a negative value is returned, otherwise the number of bytes
3793	* used or zero if no frame data was decompressed (used) from the input AVPacket.
3794	*/
3795	attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3796	int *frame_size_ptr,
3797	AVPacket *avpkt);
3798	#endif
3799
3800	/**
3801	* Decode the audio frame of size avpkt->size from avpkt->data into frame.
3802	*
3803	* Some decoders may support multiple frames in a single AVPacket. Such
3804	* decoders would then just decode the first frame and the return value would be
3805	* less than the packet size. In this case, avcodec_decode_audio4 has to be
3806	* called again with an AVPacket containing the remaining data in order to
3807	* decode the second frame, etc... Even if no frames are returned, the packet
3808	* needs to be fed to the decoder with remaining data until it is completely
3809	* consumed or an error occurs.
3810	*
3811	* Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3812	* and output. This means that for some packets they will not immediately
3813	* produce decoded output and need to be flushed at the end of decoding to get
3814	* all the decoded data. Flushing is done by calling this function with packets
3815	* with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3816	* returning samples. It is safe to flush even those decoders that are not
3817	* marked with CODEC_CAP_DELAY, then no samples will be returned.
3818	*
3819	* @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3820	* larger than the actual read bytes because some optimized bitstream
3821	* readers read 32 or 64 bits at once and could read over the end.
3822	*
3823	* @param avctx the codec context
3824	* @param[out] frame The AVFrame in which to store decoded audio samples.
3825	* The decoder will allocate a buffer for the decoded frame by
3826	* calling the AVCodecContext.get_buffer2() callback.
3827	* When AVCodecContext.refcounted_frames is set to 1, the frame is
3828	* reference counted and the returned reference belongs to the
3829	* caller. The caller must release the frame using av_frame_unref()
3830	* when the frame is no longer needed. The caller may safely write
3831	* to the frame if av_frame_is_writable() returns 1.
3832	* When AVCodecContext.refcounted_frames is set to 0, the returned
3833	* reference belongs to the decoder and is valid only until the
3834	* next call to this function or until closing or flushing the
3835	* decoder. The caller may not write to it.
3836	* @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3837	* non-zero. Note that this field being set to zero
3838	* does not mean that an error has occurred. For
3839	* decoders with CODEC_CAP_DELAY set, no given decode
3840	* call is guaranteed to produce a frame.
3841	* @param[in] avpkt The input AVPacket containing the input buffer.
3842	* At least avpkt->data and avpkt->size should be set. Some
3843	* decoders might also require additional fields to be set.
3844	* @return A negative error code is returned if an error occurred during
3845	* decoding, otherwise the number of bytes consumed from the input
3846	* AVPacket is returned.
3847	*/
3848	int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3849	int *got_frame_ptr, const AVPacket *avpkt);
3850
3851	/**
3852	* Decode the video frame of size avpkt->size from avpkt->data into picture.
3853	* Some decoders may support multiple frames in a single AVPacket, such
3854	* decoders would then just decode the first frame.
3855	*
3856	* @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3857	* the actual read bytes because some optimized bitstream readers read 32 or 64
3858	* bits at once and could read over the end.
3859	*
3860	* @warning The end of the input buffer buf should be set to 0 to ensure that
3861	* no overreading happens for damaged MPEG streams.
3862	*
3863	* @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3864	* between input and output, these need to be fed with avpkt->data=NULL,
3865	* avpkt->size=0 at the end to return the remaining frames.
3866	*
3867	* @param avctx the codec context
3868	* @param[out] picture The AVFrame in which the decoded video frame will be stored.
3869	* Use av_frame_alloc() to get an AVFrame. The codec will
3870	* allocate memory for the actual bitmap by calling the
3871	* AVCodecContext.get_buffer2() callback.
3872	* When AVCodecContext.refcounted_frames is set to 1, the frame is
3873	* reference counted and the returned reference belongs to the
3874	* caller. The caller must release the frame using av_frame_unref()
3875	* when the frame is no longer needed. The caller may safely write
3876	* to the frame if av_frame_is_writable() returns 1.
3877	* When AVCodecContext.refcounted_frames is set to 0, the returned
3878	* reference belongs to the decoder and is valid only until the
3879	* next call to this function or until closing or flushing the
3880	* decoder. The caller may not write to it.
3881	*
3882	* @param[in] avpkt The input AVPacket containing the input buffer.
3883	* You can create such packet with av_init_packet() and by then setting
3884	* data and size, some decoders might in addition need other fields like
3885	* flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3886	* fields possible.
3887	* @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3888	* @return On error a negative value is returned, otherwise the number of bytes
3889	* used or zero if no frame could be decompressed.
3890	*/
3891	int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3892	int *got_picture_ptr,
3893	const AVPacket *avpkt);
3894
3895	/**
3896	* Decode a subtitle message.
3897	* Return a negative value on error, otherwise return the number of bytes used.
3898	* If no subtitle could be decompressed, got_sub_ptr is zero.
3899	* Otherwise, the subtitle is stored in *sub.
3900	* Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3901	* simplicity, because the performance difference is expect to be negligible
3902	* and reusing a get_buffer written for video codecs would probably perform badly
3903	* due to a potentially very different allocation pattern.
3904	*
3905	* Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3906	* and output. This means that for some packets they will not immediately
3907	* produce decoded output and need to be flushed at the end of decoding to get
3908	* all the decoded data. Flushing is done by calling this function with packets
3909	* with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3910	* returning subtitles. It is safe to flush even those decoders that are not
3911	* marked with CODEC_CAP_DELAY, then no subtitles will be returned.
3912	*
3913	* @param avctx the codec context
3914	* @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3915	freed with avsubtitle_free if *got_sub_ptr is set.
3916	* @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3917	* @param[in] avpkt The input AVPacket containing the input buffer.
3918	*/
3919	int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3920	int *got_sub_ptr,
3921	AVPacket *avpkt);
3922
3923	/**
3924	* @defgroup lavc_parsing Frame parsing
3925	* @{
3926	*/
3927
3928	enum AVPictureStructure {
3929	AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3930	AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3931	AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3932	AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3933	};
3934
3935	typedef struct AVCodecParserContext {
3936	void *priv_data;
3937	struct AVCodecParser *parser;
3938	int64_t frame_offset; /* offset of the current frame */
3939	int64_t cur_offset; /* current offset
3940	(incremented by each av_parser_parse()) */
3941	int64_t next_frame_offset; /* offset of the next frame */
3942	/* video info */
3943	int pict_type; /* XXX: Put it back in AVCodecContext. */
3944	/**
3945	* This field is used for proper frame duration computation in lavf.
3946	* It signals, how much longer the frame duration of the current frame
3947	* is compared to normal frame duration.
3948	*
3949	* frame_duration = (1 + repeat_pict) * time_base
3950	*
3951	* It is used by codecs like H.264 to display telecined material.
3952	*/
3953	int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3954	int64_t pts; /* pts of the current frame */
3955	int64_t dts; /* dts of the current frame */
3956
3957	/* private data */
3958	int64_t last_pts;
3959	int64_t last_dts;
3960	int fetch_timestamp;
3961
3962	#define AV_PARSER_PTS_NB 4
3963	int cur_frame_start_index;
3964	int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3965	int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3966	int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3967
3968	int flags;
3969	#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3970	#define PARSER_FLAG_ONCE 0x0002
3971	/// Set if the parser has a valid file offset
3972	#define PARSER_FLAG_FETCHED_OFFSET 0x0004
3973	#define PARSER_FLAG_USE_CODEC_TS 0x1000
3974
3975	int64_t offset; ///< byte offset from starting packet start
3976	int64_t cur_frame_end[AV_PARSER_PTS_NB];
3977
3978	/**
3979	* Set by parser to 1 for key frames and 0 for non-key frames.
3980	* It is initialized to -1, so if the parser doesn't set this flag,
3981	* old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3982	* will be used.
3983	*/
3984	int key_frame;
3985
3986	/**
3987	* Time difference in stream time base units from the pts of this
3988	* packet to the point at which the output from the decoder has converged
3989	* independent from the availability of previous frames. That is, the
3990	* frames are virtually identical no matter if decoding started from
3991	* the very first frame or from this keyframe.
3992	* Is AV_NOPTS_VALUE if unknown.
3993	* This field is not the display duration of the current frame.
3994	* This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3995	* set.
3996	*
3997	* The purpose of this field is to allow seeking in streams that have no
3998	* keyframes in the conventional sense. It corresponds to the
3999	* recovery point SEI in H.264 and match_time_delta in NUT. It is also
4000	* essential for some types of subtitle streams to ensure that all
4001	* subtitles are correctly displayed after seeking.
4002	*/
4003	int64_t convergence_duration;
4004
4005	// Timestamp generation support:
4006	/**
4007	* Synchronization point for start of timestamp generation.
4008	*
4009	* Set to >0 for sync point, 0 for no sync point and <0 for undefined
4010	* (default).
4011	*
4012	* For example, this corresponds to presence of H.264 buffering period
4013	* SEI message.
4014	*/
4015	int dts_sync_point;
4016
4017	/**
4018	* Offset of the current timestamp against last timestamp sync point in
4019	* units of AVCodecContext.time_base.
4020	*
4021	* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4022	* contain a valid timestamp offset.
4023	*
4024	* Note that the timestamp of sync point has usually a nonzero
4025	* dts_ref_dts_delta, which refers to the previous sync point. Offset of
4026	* the next frame after timestamp sync point will be usually 1.
4027	*
4028	* For example, this corresponds to H.264 cpb_removal_delay.
4029	*/
4030	int dts_ref_dts_delta;
4031
4032	/**
4033	* Presentation delay of current frame in units of AVCodecContext.time_base.
4034	*
4035	* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4036	* contain valid non-negative timestamp delta (presentation time of a frame
4037	* must not lie in the past).
4038	*
4039	* This delay represents the difference between decoding and presentation
4040	* time of the frame.
4041	*
4042	* For example, this corresponds to H.264 dpb_output_delay.
4043	*/
4044	int pts_dts_delta;
4045
4046	/**
4047	* Position of the packet in file.
4048	*
4049	* Analogous to cur_frame_pts/dts
4050	*/
4051	int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4052
4053	/**
4054	* Byte position of currently parsed frame in stream.
4055	*/
4056	int64_t pos;
4057
4058	/**
4059	* Previous frame byte position.
4060	*/
4061	int64_t last_pos;
4062
4063	/**
4064	* Duration of the current frame.
4065	* For audio, this is in units of 1 / AVCodecContext.sample_rate.
4066	* For all other types, this is in units of AVCodecContext.time_base.
4067	*/
4068	int duration;
4069
4070	enum AVFieldOrder field_order;
4071
4072	/**
4073	* Indicate whether a picture is coded as a frame, top field or bottom field.
4074	*
4075	* For example, H.264 field_pic_flag equal to 0 corresponds to
4076	* AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4077	* equal to 1 and bottom_field_flag equal to 0 corresponds to
4078	* AV_PICTURE_STRUCTURE_TOP_FIELD.
4079	*/
4080	enum AVPictureStructure picture_structure;
4081
4082	/**
4083	* Picture number incremented in presentation or output order.
4084	* This field may be reinitialized at the first picture of a new sequence.
4085	*
4086	* For example, this corresponds to H.264 PicOrderCnt.
4087	*/
4088	int output_picture_number;
4089	} AVCodecParserContext;
4090
4091	typedef struct AVCodecParser {
4092	int codec_ids[5]; /* several codec IDs are permitted */
4093	int priv_data_size;
4094	int (*parser_init)(AVCodecParserContext *s);
4095	int (*parser_parse)(AVCodecParserContext *s,
4096	AVCodecContext *avctx,
4097	const uint8_t **poutbuf, int *poutbuf_size,
4098	const uint8_t *buf, int buf_size);
4099	void (*parser_close)(AVCodecParserContext *s);
4100	int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4101	struct AVCodecParser *next;
4102	} AVCodecParser;
4103
4104	AVCodecParser *av_parser_next(AVCodecParser *c);
4105
4106	void av_register_codec_parser(AVCodecParser *parser);
4107	AVCodecParserContext *av_parser_init(int codec_id);
4108
4109	/**
4110	* Parse a packet.
4111	*
4112	* @param s parser context.
4113	* @param avctx codec context.
4114	* @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4115	* @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4116	* @param buf input buffer.
4117	* @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4118	* @param pts input presentation timestamp.
4119	* @param dts input decoding timestamp.
4120	* @param pos input byte position in stream.
4121	* @return the number of bytes of the input bitstream used.
4122	*
4123	* Example:
4124	* @code
4125	* while(in_len){
4126	* len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4127	* in_data, in_len,
4128	* pts, dts, pos);
4129	* in_data += len;
4130	* in_len -= len;
4131	*
4132	* if(size)
4133	* decode_frame(data, size);
4134	* }
4135	* @endcode
4136	*/
4137	int av_parser_parse2(AVCodecParserContext *s,
4138	AVCodecContext *avctx,
4139	uint8_t **poutbuf, int *poutbuf_size,
4140	const uint8_t *buf, int buf_size,
4141	int64_t pts, int64_t dts,
4142	int64_t pos);
4143
4144	/**
4145	* @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4146	* @deprecated use AVBitStreamFilter
4147	*/
4148	int av_parser_change(AVCodecParserContext *s,
4149	AVCodecContext *avctx,
4150	uint8_t **poutbuf, int *poutbuf_size,
4151	const uint8_t *buf, int buf_size, int keyframe);
4152	void av_parser_close(AVCodecParserContext *s);
4153
4154	/**
4155	* @}
4156	* @}
4157	*/
4158
4159	/**
4160	* @addtogroup lavc_encoding
4161	* @{
4162	*/
4163
4164	/**
4165	* Find a registered encoder with a matching codec ID.
4166	*
4167	* @param id AVCodecID of the requested encoder
4168	* @return An encoder if one was found, NULL otherwise.
4169	*/
4170	AVCodec *avcodec_find_encoder(enum AVCodecID id);
4171
4172	/**
4173	* Find a registered encoder with the specified name.
4174	*
4175	* @param name name of the requested encoder
4176	* @return An encoder if one was found, NULL otherwise.
4177	*/
4178	AVCodec *avcodec_find_encoder_by_name(const char *name);
4179
4180	#if FF_API_OLD_ENCODE_AUDIO
4181	/**
4182	* Encode an audio frame from samples into buf.
4183	*
4184	* @deprecated Use avcodec_encode_audio2 instead.
4185	*
4186	* @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4187	* However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4188	* will know how much space is needed because it depends on the value passed
4189	* in buf_size as described below. In that case a lower value can be used.
4190	*
4191	* @param avctx the codec context
4192	* @param[out] buf the output buffer
4193	* @param[in] buf_size the output buffer size
4194	* @param[in] samples the input buffer containing the samples
4195	* The number of samples read from this buffer is frame_size*channels,
4196	* both of which are defined in avctx.
4197	* For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4198	* samples read from samples is equal to:
4199	* buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4200	* This also implies that av_get_bits_per_sample() must not return 0 for these
4201	* codecs.
4202	* @return On error a negative value is returned, on success zero or the number
4203	* of bytes used to encode the data read from the input buffer.
4204	*/
4205	int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4206	uint8_t *buf, int buf_size,
4207	const short *samples);
4208	#endif
4209
4210	/**
4211	* Encode a frame of audio.
4212	*
4213	* Takes input samples from frame and writes the next output packet, if
4214	* available, to avpkt. The output packet does not necessarily contain data for
4215	* the most recent frame, as encoders can delay, split, and combine input frames
4216	* internally as needed.
4217	*
4218	* @param avctx codec context
4219	* @param avpkt output AVPacket.
4220	* The user can supply an output buffer by setting
4221	* avpkt->data and avpkt->size prior to calling the
4222	* function, but if the size of the user-provided data is not
4223	* large enough, encoding will fail. If avpkt->data and
4224	* avpkt->size are set, avpkt->destruct must also be set. All
4225	* other AVPacket fields will be reset by the encoder using
4226	* av_init_packet(). If avpkt->data is NULL, the encoder will
4227	* allocate it. The encoder will set avpkt->size to the size
4228	* of the output packet.
4229	*
4230	* If this function fails or produces no output, avpkt will be
4231	* freed using av_free_packet() (i.e. avpkt->destruct will be
4232	* called to free the user supplied buffer).
4233	* @param[in] frame AVFrame containing the raw audio data to be encoded.
4234	* May be NULL when flushing an encoder that has the
4235	* CODEC_CAP_DELAY capability set.
4236	* If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4237	* can have any number of samples.
4238	* If it is not set, frame->nb_samples must be equal to
4239	* avctx->frame_size for all frames except the last.
4240	* The final frame may be smaller than avctx->frame_size.
4241	* @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4242	* output packet is non-empty, and to 0 if it is
4243	* empty. If the function returns an error, the
4244	* packet can be assumed to be invalid, and the
4245	* value of got_packet_ptr is undefined and should
4246	* not be used.
4247	* @return 0 on success, negative error code on failure
4248	*/
4249	int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4250	const AVFrame *frame, int *got_packet_ptr);
4251
4252	#if FF_API_OLD_ENCODE_VIDEO
4253	/**
4254	* @deprecated use avcodec_encode_video2() instead.
4255	*
4256	* Encode a video frame from pict into buf.
4257	* The input picture should be
4258	* stored using a specific format, namely avctx.pix_fmt.
4259	*
4260	* @param avctx the codec context
4261	* @param[out] buf the output buffer for the bitstream of encoded frame
4262	* @param[in] buf_size the size of the output buffer in bytes
4263	* @param[in] pict the input picture to encode
4264	* @return On error a negative value is returned, on success zero or the number
4265	* of bytes used from the output buffer.
4266	*/
4267	attribute_deprecated
4268	int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4269	const AVFrame *pict);
4270	#endif
4271
4272	/**
4273	* Encode a frame of video.
4274	*
4275	* Takes input raw video data from frame and writes the next output packet, if
4276	* available, to avpkt. The output packet does not necessarily contain data for
4277	* the most recent frame, as encoders can delay and reorder input frames
4278	* internally as needed.
4279	*
4280	* @param avctx codec context
4281	* @param avpkt output AVPacket.
4282	* The user can supply an output buffer by setting
4283	* avpkt->data and avpkt->size prior to calling the
4284	* function, but if the size of the user-provided data is not
4285	* large enough, encoding will fail. All other AVPacket fields
4286	* will be reset by the encoder using av_init_packet(). If
4287	* avpkt->data is NULL, the encoder will allocate it.
4288	* The encoder will set avpkt->size to the size of the
4289	* output packet. The returned data (if any) belongs to the
4290	* caller, he is responsible for freeing it.
4291	*
4292	* If this function fails or produces no output, avpkt will be
4293	* freed using av_free_packet() (i.e. avpkt->destruct will be
4294	* called to free the user supplied buffer).
4295	* @param[in] frame AVFrame containing the raw video data to be encoded.
4296	* May be NULL when flushing an encoder that has the
4297	* CODEC_CAP_DELAY capability set.
4298	* @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4299	* output packet is non-empty, and to 0 if it is
4300	* empty. If the function returns an error, the
4301	* packet can be assumed to be invalid, and the
4302	* value of got_packet_ptr is undefined and should
4303	* not be used.
4304	* @return 0 on success, negative error code on failure
4305	*/
4306	int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4307	const AVFrame *frame, int *got_packet_ptr);
4308
4309	int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4310	const AVSubtitle *sub);
4311
4312
4313	/**
4314	* @}
4315	*/
4316
4317	#if FF_API_AVCODEC_RESAMPLE
4318	/**
4319	* @defgroup lavc_resample Audio resampling
4320	* @ingroup libavc
4321	* @deprecated use libswresample instead
4322	*
4323	* @{
4324	*/
4325	struct ReSampleContext;
4326	struct AVResampleContext;
4327
4328	typedef struct ReSampleContext ReSampleContext;
4329
4330	/**
4331	* Initialize audio resampling context.
4332	*
4333	* @param output_channels number of output channels
4334	* @param input_channels number of input channels
4335	* @param output_rate output sample rate
4336	* @param input_rate input sample rate
4337	* @param sample_fmt_out requested output sample format
4338	* @param sample_fmt_in input sample format
4339	* @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4340	* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4341	* @param linear if 1 then the used FIR filter will be linearly interpolated
4342	between the 2 closest, if 0 the closest will be used
4343	* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4344	* @return allocated ReSampleContext, NULL if error occurred
4345	*/
4346	attribute_deprecated
4347	ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4348	int output_rate, int input_rate,
4349	enum AVSampleFormat sample_fmt_out,
4350	enum AVSampleFormat sample_fmt_in,
4351	int filter_length, int log2_phase_count,
4352	int linear, double cutoff);
4353
4354	attribute_deprecated
4355	int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4356
4357	/**
4358	* Free resample context.
4359	*
4360	* @param s a non-NULL pointer to a resample context previously
4361	* created with av_audio_resample_init()
4362	*/
4363	attribute_deprecated
4364	void audio_resample_close(ReSampleContext *s);
4365
4366
4367	/**
4368	* Initialize an audio resampler.
4369	* Note, if either rate is not an integer then simply scale both rates up so they are.
4370	* @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4371	* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4372	* @param linear If 1 then the used FIR filter will be linearly interpolated
4373	between the 2 closest, if 0 the closest will be used
4374	* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4375	*/
4376	attribute_deprecated
4377	struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4378
4379	/**
4380	* Resample an array of samples using a previously configured context.
4381	* @param src an array of unconsumed samples
4382	* @param consumed the number of samples of src which have been consumed are returned here
4383	* @param src_size the number of unconsumed samples available
4384	* @param dst_size the amount of space in samples available in dst
4385	* @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
4386	* @return the number of samples written in dst or -1 if an error occurred
4387	*/
4388	attribute_deprecated
4389	int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4390
4391
4392	/**
4393	* Compensate samplerate/timestamp drift. The compensation is done by changing
4394	* the resampler parameters, so no audible clicks or similar distortions occur
4395	* @param compensation_distance distance in output samples over which the compensation should be performed
4396	* @param sample_delta number of output samples which should be output less
4397	*
4398	* example: av_resample_compensate(c, 10, 500)
4399	* here instead of 510 samples only 500 samples would be output
4400	*
4401	* note, due to rounding the actual compensation might be slightly different,
4402	* especially if the compensation_distance is large and the in_rate used during init is small
4403	*/
4404	attribute_deprecated
4405	void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4406	attribute_deprecated
4407	void av_resample_close(struct AVResampleContext *c);
4408
4409	/**
4410	* @}
4411	*/
4412	#endif
4413
4414	/**
4415	* @addtogroup lavc_picture
4416	* @{
4417	*/
4418
4419	/**
4420	* Allocate memory for the pixels of a picture and setup the AVPicture
4421	* fields for it.
4422	*
4423	* Call avpicture_free() to free it.
4424	*
4425	* @param picture the picture structure to be filled in
4426	* @param pix_fmt the pixel format of the picture
4427	* @param width the width of the picture
4428	* @param height the height of the picture
4429	* @return zero if successful, a negative error code otherwise
4430	*
4431	* @see av_image_alloc(), avpicture_fill()
4432	*/
4433	int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4434
4435	/**
4436	* Free a picture previously allocated by avpicture_alloc().
4437	* The data buffer used by the AVPicture is freed, but the AVPicture structure
4438	* itself is not.
4439	*
4440	* @param picture the AVPicture to be freed
4441	*/
4442	void avpicture_free(AVPicture *picture);
4443
4444	/**
4445	* Setup the picture fields based on the specified image parameters
4446	* and the provided image data buffer.
4447	*
4448	* The picture fields are filled in by using the image data buffer
4449	* pointed to by ptr.
4450	*
4451	* If ptr is NULL, the function will fill only the picture linesize
4452	* array and return the required size for the image buffer.
4453	*
4454	* To allocate an image buffer and fill the picture data in one call,
4455	* use avpicture_alloc().
4456	*
4457	* @param picture the picture to be filled in
4458	* @param ptr buffer where the image data is stored, or NULL
4459	* @param pix_fmt the pixel format of the image
4460	* @param width the width of the image in pixels
4461	* @param height the height of the image in pixels
4462	* @return the size in bytes required for src, a negative error code
4463	* in case of failure
4464	*
4465	* @see av_image_fill_arrays()
4466	*/
4467	int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4468	enum AVPixelFormat pix_fmt, int width, int height);
4469
4470	/**
4471	* Copy pixel data from an AVPicture into a buffer.
4472	*
4473	* avpicture_get_size() can be used to compute the required size for
4474	* the buffer to fill.
4475	*
4476	* @param src source picture with filled data
4477	* @param pix_fmt picture pixel format
4478	* @param width picture width
4479	* @param height picture height
4480	* @param dest destination buffer
4481	* @param dest_size destination buffer size in bytes
4482	* @return the number of bytes written to dest, or a negative value
4483	* (error code) on error, for example if the destination buffer is not
4484	* big enough
4485	*
4486	* @see av_image_copy_to_buffer()
4487	*/
4488	int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4489	int width, int height,
4490	unsigned char *dest, int dest_size);
4491
4492	/**
4493	* Calculate the size in bytes that a picture of the given width and height
4494	* would occupy if stored in the given picture format.
4495	*
4496	* @param pix_fmt picture pixel format
4497	* @param width picture width
4498	* @param height picture height
4499	* @return the computed picture buffer size or a negative error code
4500	* in case of error
4501	*
4502	* @see av_image_get_buffer_size().
4503	*/
4504	int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4505
4506	#if FF_API_DEINTERLACE
4507	/**
4508	* deinterlace - if not supported return -1
4509	*
4510	* @deprecated - use yadif (in libavfilter) instead
4511	*/
4512	attribute_deprecated
4513	int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4514	enum AVPixelFormat pix_fmt, int width, int height);
4515	#endif
4516	/**
4517	* Copy image src to dst. Wraps av_image_copy().
4518	*/
4519	void av_picture_copy(AVPicture *dst, const AVPicture *src,
4520	enum AVPixelFormat pix_fmt, int width, int height);
4521
4522	/**
4523	* Crop image top and left side.
4524	*/
4525	int av_picture_crop(AVPicture *dst, const AVPicture *src,
4526	enum AVPixelFormat pix_fmt, int top_band, int left_band);
4527
4528	/**
4529	* Pad image.
4530	*/
4531	int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4532	int padtop, int padbottom, int padleft, int padright, int *color);
4533
4534	/**
4535	* @}
4536	*/
4537
4538	/**
4539	* @defgroup lavc_misc Utility functions
4540	* @ingroup libavc
4541	*
4542	* Miscellaneous utility functions related to both encoding and decoding
4543	* (or neither).
4544	* @{
4545	*/
4546
4547	/**
4548	* @defgroup lavc_misc_pixfmt Pixel formats
4549	*
4550	* Functions for working with pixel formats.
4551	* @{
4552	*/
4553
4554	/**
4555	* Utility function to access log2_chroma_w log2_chroma_h from
4556	* the pixel format AVPixFmtDescriptor.
4557	*
4558	* This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4559	* for one that returns a failure code and continues in case of invalid
4560	* pix_fmts.
4561	*
4562	* @param[in] pix_fmt the pixel format
4563	* @param[out] h_shift store log2_chroma_w
4564	* @param[out] v_shift store log2_chroma_h
4565	*
4566	* @see av_pix_fmt_get_chroma_sub_sample
4567	*/
4568
4569	void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4570
4571	/**
4572	* Return a value representing the fourCC code associated to the
4573	* pixel format pix_fmt, or 0 if no associated fourCC code can be
4574	* found.
4575	*/
4576	unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4577
4578	#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4579	#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4580	#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4581	#define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4582	#define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4583	#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4584
4585	/**
4586	* Compute what kind of losses will occur when converting from one specific
4587	* pixel format to another.
4588	* When converting from one pixel format to another, information loss may occur.
4589	* For example, when converting from RGB24 to GRAY, the color information will
4590	* be lost. Similarly, other losses occur when converting from some formats to
4591	* other formats. These losses can involve loss of chroma, but also loss of
4592	* resolution, loss of color depth, loss due to the color space conversion, loss
4593	* of the alpha bits or loss due to color quantization.
4594	* avcodec_get_fix_fmt_loss() informs you about the various types of losses
4595	* which will occur when converting from one pixel format to another.
4596	*
4597	* @param[in] dst_pix_fmt destination pixel format
4598	* @param[in] src_pix_fmt source pixel format
4599	* @param[in] has_alpha Whether the source pixel format alpha channel is used.
4600	* @return Combination of flags informing you what kind of losses will occur
4601	* (maximum loss for an invalid dst_pix_fmt).
4602	*/
4603	int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4604	int has_alpha);
4605
4606	/**
4607	* Find the best pixel format to convert to given a certain source pixel
4608	* format. When converting from one pixel format to another, information loss
4609	* may occur. For example, when converting from RGB24 to GRAY, the color
4610	* information will be lost. Similarly, other losses occur when converting from
4611	* some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4612	* the given pixel formats should be used to suffer the least amount of loss.
4613	* The pixel formats from which it chooses one, are determined by the
4614	* pix_fmt_list parameter.
4615	*
4616	*
4617	* @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4618	* @param[in] src_pix_fmt source pixel format
4619	* @param[in] has_alpha Whether the source pixel format alpha channel is used.
4620	* @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4621	* @return The best pixel format to convert to or -1 if none was found.
4622	*/
4623	enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4624	enum AVPixelFormat src_pix_fmt,
4625	int has_alpha, int *loss_ptr);
4626
4627	/**
4628	* Find the best pixel format to convert to given a certain source pixel
4629	* format and a selection of two destination pixel formats. When converting from
4630	* one pixel format to another, information loss may occur. For example, when converting
4631	* from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4632	* converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
4633	* the given pixel formats should be used to suffer the least amount of loss.
4634	*
4635	* If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be
4636	* returned.
4637	*
4638	* @code
4639	* src_pix_fmt = AV_PIX_FMT_YUV420P;
4640	* dst_pix_fmt1= AV_PIX_FMT_RGB24;
4641	* dst_pix_fmt2= AV_PIX_FMT_GRAY8;
4642	* dst_pix_fmt3= AV_PIX_FMT_RGB8;
4643	* loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4644	* dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4645	* dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4646	* @endcode
4647	*
4648	* @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4649	* @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4650	* @param[in] src_pix_fmt Source pixel format
4651	* @param[in] has_alpha Whether the source pixel format alpha channel is used.
4652	* @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4653	* NULL or value of zero means we care about all losses. Out: the loss
4654	* that occurs when converting from src to selected dst pixel format.
4655	* @return The best pixel format to convert to or -1 if none was found.
4656	*/
4657	enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4658	enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4659
4660	attribute_deprecated
4661	#if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4662	enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4663	enum AVPixelFormat src_pix_fmt,
4664	int has_alpha, int *loss_ptr);
4665	#else
4666	enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4667	enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4668	#endif
4669
4670
4671	enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4672
4673	/**
4674	* @}
4675	*/
4676
4677	void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4678
4679	/**
4680	* Put a string representing the codec tag codec_tag in buf.
4681	*
4682	* @param buf_size size in bytes of buf
4683	* @return the length of the string that would have been generated if
4684	* enough space had been available, excluding the trailing null
4685	*/
4686	size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4687
4688	void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4689
4690	/**
4691	* Return a name for the specified profile, if available.
4692	*
4693	* @param codec the codec that is searched for the given profile
4694	* @param profile the profile value for which a name is requested
4695	* @return A name for the profile if found, NULL otherwise.
4696	*/
4697	const char *av_get_profile_name(const AVCodec *codec, int profile);
4698
4699	int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4700	int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4701	//FIXME func typedef
4702
4703	/**
4704	* Fill AVFrame audio data and linesize pointers.
4705	*
4706	* The buffer buf must be a preallocated buffer with a size big enough
4707	* to contain the specified samples amount. The filled AVFrame data
4708	* pointers will point to this buffer.
4709	*
4710	* AVFrame extended_data channel pointers are allocated if necessary for
4711	* planar audio.
4712	*
4713	* @param frame the AVFrame
4714	* frame->nb_samples must be set prior to calling the
4715	* function. This function fills in frame->data,
4716	* frame->extended_data, frame->linesize[0].
4717	* @param nb_channels channel count
4718	* @param sample_fmt sample format
4719	* @param buf buffer to use for frame data
4720	* @param buf_size size of buffer
4721	* @param align plane size sample alignment (0 = default)
4722	* @return >=0 on success, negative error code on failure
4723	* @todo return the size in bytes required to store the samples in
4724	* case of success, at the next libavutil bump
4725	*/
4726	int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4727	enum AVSampleFormat sample_fmt, const uint8_t *buf,
4728	int buf_size, int align);
4729
4730	/**
4731	* Reset the internal decoder state / flush internal buffers. Should be called
4732	* e.g. when seeking or when switching to a different stream.
4733	*
4734	* @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4735	* this invalidates the frames previously returned from the decoder. When
4736	* refcounted frames are used, the decoder just releases any references it might
4737	* keep internally, but the caller's reference remains valid.
4738	*/
4739	void avcodec_flush_buffers(AVCodecContext *avctx);
4740
4741	/**
4742	* Return codec bits per sample.
4743	*
4744	* @param[in] codec_id the codec
4745	* @return Number of bits per sample or zero if unknown for the given codec.
4746	*/
4747	int av_get_bits_per_sample(enum AVCodecID codec_id);
4748
4749	/**
4750	* Return the PCM codec associated with a sample format.
4751	* @param be endianness, 0 for little, 1 for big,
4752	* -1 (or anything else) for native
4753	* @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4754	*/
4755	enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4756
4757	/**
4758	* Return codec bits per sample.
4759	* Only return non-zero if the bits per sample is exactly correct, not an
4760	* approximation.
4761	*
4762	* @param[in] codec_id the codec
4763	* @return Number of bits per sample or zero if unknown for the given codec.
4764	*/
4765	int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4766
4767	/**
4768	* Return audio frame duration.
4769	*
4770	* @param avctx codec context
4771	* @param frame_bytes size of the frame, or 0 if unknown
4772	* @return frame duration, in samples, if known. 0 if not able to
4773	* determine.
4774	*/
4775	int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4776
4777
4778	typedef struct AVBitStreamFilterContext {
4779	void *priv_data;
4780	struct AVBitStreamFilter *filter;
4781	AVCodecParserContext *parser;
4782	struct AVBitStreamFilterContext *next;
4783	} AVBitStreamFilterContext;
4784
4785
4786	typedef struct AVBitStreamFilter {
4787	const char *name;
4788	int priv_data_size;
4789	int (*filter)(AVBitStreamFilterContext *bsfc,
4790	AVCodecContext *avctx, const char *args,
4791	uint8_t **poutbuf, int *poutbuf_size,
4792	const uint8_t *buf, int buf_size, int keyframe);
4793	void (*close)(AVBitStreamFilterContext *bsfc);
4794	struct AVBitStreamFilter *next;
4795	} AVBitStreamFilter;
4796
4797	/**
4798	* Register a bitstream filter.
4799	*
4800	* The filter will be accessible to the application code through
4801	* av_bitstream_filter_next() or can be directly initialized with
4802	* av_bitstream_filter_init().
4803	*
4804	* @see avcodec_register_all()
4805	*/
4806	void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4807
4808	/**
4809	* Create and initialize a bitstream filter context given a bitstream
4810	* filter name.
4811	*
4812	* The returned context must be freed with av_bitstream_filter_close().
4813	*
4814	* @param name the name of the bitstream filter
4815	* @return a bitstream filter context if a matching filter was found
4816	* and successfully initialized, NULL otherwise
4817	*/
4818	AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4819
4820	/**
4821	* Filter bitstream.
4822	*
4823	* This function filters the buffer buf with size buf_size, and places the
4824	* filtered buffer in the buffer pointed to by poutbuf.
4825	*
4826	* The output buffer must be freed by the caller.
4827	*
4828	* @param bsfc bitstream filter context created by av_bitstream_filter_init()
4829	* @param avctx AVCodecContext accessed by the filter, may be NULL.
4830	* If specified, this must point to the encoder context of the
4831	* output stream the packet is sent to.
4832	* @param args arguments which specify the filter configuration, may be NULL
4833	* @param poutbuf pointer which is updated to point to the filtered buffer
4834	* @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
4835	* @param buf buffer containing the data to filter
4836	* @param buf_size size in bytes of buf
4837	* @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
4838	* @return >= 0 in case of success, or a negative error code in case of failure
4839	*
4840	* If the return value is positive, an output buffer is allocated and
4841	* is availble in *poutbuf, and is distinct from the input buffer.
4842	*
4843	* If the return value is 0, the output buffer is not allocated and
4844	* should be considered identical to the input buffer, or in case
4845	* *poutbuf was set it points to the input buffer (not necessarily to
4846	* its starting address).
4847	*/
4848	int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4849	AVCodecContext *avctx, const char *args,
4850	uint8_t **poutbuf, int *poutbuf_size,
4851	const uint8_t *buf, int buf_size, int keyframe);
4852
4853	/**
4854	* Release bitstream filter context.
4855	*
4856	* @param bsf the bitstream filter context created with
4857	* av_bitstream_filter_init(), can be NULL
4858	*/
4859	void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4860
4861	/**
4862	* If f is NULL, return the first registered bitstream filter,
4863	* if f is non-NULL, return the next registered bitstream filter
4864	* after f, or NULL if f is the last one.
4865	*
4866	* This function can be used to iterate over all registered bitstream
4867	* filters.
4868	*/
4869	AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4870
4871	/* memory */
4872
4873	/**
4874	* Reallocate the given block if it is not large enough, otherwise do nothing.
4875	*
4876	* @see av_realloc
4877	*/
4878	void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4879
4880	/**
4881	* Allocate a buffer, reusing the given one if large enough.
4882	*
4883	* Contrary to av_fast_realloc the current buffer contents might not be
4884	* preserved and on error the old buffer is freed, thus no special
4885	* handling to avoid memleaks is necessary.
4886	*
4887	* @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4888	* @param size size of the buffer *ptr points to
4889	* @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4890	* *size 0 if an error occurred.
4891	*/
4892	void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4893
4894	/**
4895	* Same behaviour av_fast_malloc but the buffer has additional
4896	* FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
4897	*
4898	* In addition the whole buffer will initially and after resizes
4899	* be 0-initialized so that no uninitialized data will ever appear.
4900	*/
4901	void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4902
4903	/**
4904	* Same behaviour av_fast_padded_malloc except that buffer will always
4905	* be 0-initialized after call.
4906	*/
4907	void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4908
4909	/**
4910	* Encode extradata length to a buffer. Used by xiph codecs.
4911	*
4912	* @param s buffer to write to; must be at least (v/255+1) bytes long
4913	* @param v size of extradata in bytes
4914	* @return number of bytes written to the buffer.
4915	*/
4916	unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4917
4918	#if FF_API_MISSING_SAMPLE
4919	/**
4920	* Log a generic warning message about a missing feature. This function is
4921	* intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4922	* only, and would normally not be used by applications.
4923	* @param[in] avc a pointer to an arbitrary struct of which the first field is
4924	* a pointer to an AVClass struct
4925	* @param[in] feature string containing the name of the missing feature
4926	* @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4927	* If want_sample is non-zero, additional verbage will be added to the log
4928	* message which tells the user how to report samples to the development
4929	* mailing list.
4930	* @deprecated Use avpriv_report_missing_feature() instead.
4931	*/
4932	attribute_deprecated
4933	void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4934
4935	/**
4936	* Log a generic warning message asking for a sample. This function is
4937	* intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4938	* only, and would normally not be used by applications.
4939	* @param[in] avc a pointer to an arbitrary struct of which the first field is
4940	* a pointer to an AVClass struct
4941	* @param[in] msg string containing an optional message, or NULL if no message
4942	* @deprecated Use avpriv_request_sample() instead.
4943	*/
4944	attribute_deprecated
4945	void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4946	#endif /* FF_API_MISSING_SAMPLE */
4947
4948	/**
4949	* Register the hardware accelerator hwaccel.
4950	*/
4951	void av_register_hwaccel(AVHWAccel *hwaccel);
4952
4953	/**
4954	* If hwaccel is NULL, returns the first registered hardware accelerator,
4955	* if hwaccel is non-NULL, returns the next registered hardware accelerator
4956	* after hwaccel, or NULL if hwaccel is the last one.
4957	*/
4958	AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4959
4960
4961	/**
4962	* Lock operation used by lockmgr
4963	*/
4964	enum AVLockOp {
4965	AV_LOCK_CREATE, ///< Create a mutex
4966	AV_LOCK_OBTAIN, ///< Lock the mutex
4967	AV_LOCK_RELEASE, ///< Unlock the mutex
4968	AV_LOCK_DESTROY, ///< Free mutex resources
4969	};
4970
4971	/**
4972	* Register a user provided lock manager supporting the operations
4973	* specified by AVLockOp. mutex points to a (void *) where the
4974	* lockmgr should store/get a pointer to a user allocated mutex. It's
4975	* NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4976	*
4977	* @param cb User defined callback. Note: FFmpeg may invoke calls to this
4978	* callback during the call to av_lockmgr_register().
4979	* Thus, the application must be prepared to handle that.
4980	* If cb is set to NULL the lockmgr will be unregistered.
4981	* Also note that during unregistration the previously registered
4982	* lockmgr callback may also be invoked.
4983	*/
4984	int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4985
4986	/**
4987	* Get the type of the given codec.
4988	*/
4989	enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4990
4991	/**
4992	* Get the name of a codec.
4993	* @return a static string identifying the codec; never NULL
4994	*/
4995	const char *avcodec_get_name(enum AVCodecID id);
4996
4997	/**
4998	* @return a positive value if s is open (i.e. avcodec_open2() was called on it
4999	* with no corresponding avcodec_close()), 0 otherwise.
5000	*/
5001	int avcodec_is_open(AVCodecContext *s);
5002
5003	/**
5004	* @return a non-zero number if codec is an encoder, zero otherwise
5005	*/
5006	int av_codec_is_encoder(const AVCodec *codec);
5007
5008	/**
5009	* @return a non-zero number if codec is a decoder, zero otherwise
5010	*/
5011	int av_codec_is_decoder(const AVCodec *codec);
5012
5013	/**
5014	* @return descriptor for given codec ID or NULL if no descriptor exists.
5015	*/
5016	const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5017
5018	/**
5019	* Iterate over all codec descriptors known to libavcodec.
5020	*
5021	* @param prev previous descriptor. NULL to get the first descriptor.
5022	*
5023	* @return next descriptor or NULL after the last descriptor
5024	*/
5025	const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5026
5027	/**
5028	* @return codec descriptor with the given name or NULL if no such descriptor
5029	* exists.
5030	*/
5031	const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5032
5033	/**
5034	* @}
5035	*/
5036
5037	#endif /* AVCODEC_AVCODEC_H */
5038