path: root/libavformat/flvenc.c (plain)
blob: 899b07ea7bef8575347c757e7a3de1459ef5437b

1	/*
2	* FLV muxer
3	* Copyright (c) 2003 The FFmpeg Project
4	*
5	* This file is part of FFmpeg.
6	*
7	* FFmpeg is free software; you can redistribute it and/or
8	* modify it under the terms of the GNU Lesser General Public
9	* License as published by the Free Software Foundation; either
10	* version 2.1 of the License, or (at your option) any later version.
11	*
12	* FFmpeg is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15	* Lesser General Public License for more details.
16	*
17	* You should have received a copy of the GNU Lesser General Public
18	* License along with FFmpeg; if not, write to the Free Software
19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20	*/
21
22	#include "libavutil/intreadwrite.h"
23	#include "libavutil/dict.h"
24	#include "libavutil/intfloat.h"
25	#include "libavutil/avassert.h"
26	#include "libavutil/mathematics.h"
27	#include "avio_internal.h"
28	#include "avio.h"
29	#include "avc.h"
30	#include "avformat.h"
31	#include "flv.h"
32	#include "internal.h"
33	#include "metadata.h"
34	#include "libavutil/opt.h"
35	#include "libavcodec/put_bits.h"
36	#include "libavcodec/aacenctab.h"
37
38
39	static const AVCodecTag flv_video_codec_ids[] = {
40	{ AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
41	{ AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
42	{ AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
43	{ AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
44	{ AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
45	{ AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
46	{ AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
47	{ AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
48	{ AV_CODEC_ID_H264, FLV_CODECID_H264 },
49	{ AV_CODEC_ID_NONE, 0 }
50	};
51
52	static const AVCodecTag flv_audio_codec_ids[] = {
53	{ AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
54	{ AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
55	{ AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
56	{ AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
57	{ AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
58	{ AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
59	{ AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
60	{ AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
61	{ AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
62	{ AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
63	{ AV_CODEC_ID_NONE, 0 }
64	};
65
66	typedef enum {
67	FLV_AAC_SEQ_HEADER_DETECT = (1 << 0),
68	FLV_NO_SEQUENCE_END = (1 << 1),
69	FLV_ADD_KEYFRAME_INDEX = (1 << 2),
70	FLV_NO_METADATA = (1 << 3),
71	FLV_NO_DURATION_FILESIZE = (1 << 4),
72	} FLVFlags;
73
74	typedef struct FLVFileposition {
75	int64_t keyframe_position;
76	double keyframe_timestamp;
77	struct FLVFileposition *next;
78	} FLVFileposition;
79
80	typedef struct FLVContext {
81	AVClass *av_class;
82	int reserved;
83	int64_t duration_offset;
84	int64_t filesize_offset;
85	int64_t duration;
86	int64_t delay; ///< first dts delay (needed for AVC & Speex)
87
88	int64_t datastart_offset;
89	int64_t datasize_offset;
90	int64_t datasize;
91	int64_t videosize_offset;
92	int64_t videosize;
93	int64_t audiosize_offset;
94	int64_t audiosize;
95
96	int64_t metadata_size_pos;
97	int64_t metadata_totalsize_pos;
98	int64_t metadata_totalsize;
99	int64_t keyframe_index_size;
100
101	int64_t lasttimestamp_offset;
102	double lasttimestamp;
103	int64_t lastkeyframetimestamp_offset;
104	double lastkeyframetimestamp;
105	int64_t lastkeyframelocation_offset;
106	int64_t lastkeyframelocation;
107
108	int acurframeindex;
109	int64_t keyframes_info_offset;
110
111	int64_t filepositions_count;
112	FLVFileposition *filepositions;
113	FLVFileposition *head_filepositions;
114
115	AVCodecParameters *audio_par;
116	AVCodecParameters *video_par;
117	double framerate;
118	AVCodecParameters *data_par;
119
120	int flags;
121	} FLVContext;
122
123	typedef struct FLVStreamContext {
124	int64_t last_ts; ///< last timestamp for each stream
125	} FLVStreamContext;
126
127	static int get_audio_flags(AVFormatContext *s, AVCodecParameters *par)
128	{
129	int flags = (par->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
130	: FLV_SAMPLESSIZE_8BIT;
131
132	if (par->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
133	return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
134	FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
135	else if (par->codec_id == AV_CODEC_ID_SPEEX) {
136	if (par->sample_rate != 16000) {
137	av_log(s, AV_LOG_ERROR,
138	"FLV only supports wideband (16kHz) Speex audio\n");
139	return AVERROR(EINVAL);
140	}
141	if (par->channels != 1) {
142	av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
143	return AVERROR(EINVAL);
144	}
145	return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
146	} else {
147	switch (par->sample_rate) {
148	case 48000:
149	// 48khz mp3 is stored with 44k1 samplerate identifer
150	if (par->codec_id == AV_CODEC_ID_MP3) {
151	flags |= FLV_SAMPLERATE_44100HZ;
152	break;
153	} else {
154	goto error;
155	}
156	case 44100:
157	flags |= FLV_SAMPLERATE_44100HZ;
158	break;
159	case 22050:
160	flags |= FLV_SAMPLERATE_22050HZ;
161	break;
162	case 11025:
163	flags |= FLV_SAMPLERATE_11025HZ;
164	break;
165	case 16000: // nellymoser only
166	case 8000: // nellymoser only
167	case 5512: // not MP3
168	if (par->codec_id != AV_CODEC_ID_MP3) {
169	flags |= FLV_SAMPLERATE_SPECIAL;
170	break;
171	}
172	default:
173	error:
174	av_log(s, AV_LOG_ERROR,
175	"FLV does not support sample rate %d, "
176	"choose from (44100, 22050, 11025)\n", par->sample_rate);
177	return AVERROR(EINVAL);
178	}
179	}
180
181	if (par->channels > 1)
182	flags |= FLV_STEREO;
183
184	switch (par->codec_id) {
185	case AV_CODEC_ID_MP3:
186	flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
187	break;
188	case AV_CODEC_ID_PCM_U8:
189	flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
190	break;
191	case AV_CODEC_ID_PCM_S16BE:
192	flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
193	break;
194	case AV_CODEC_ID_PCM_S16LE:
195	flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
196	break;
197	case AV_CODEC_ID_ADPCM_SWF:
198	flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
199	break;
200	case AV_CODEC_ID_NELLYMOSER:
201	if (par->sample_rate == 8000)
202	flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
203	else if (par->sample_rate == 16000)
204	flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
205	else
206	flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
207	break;
208	case AV_CODEC_ID_PCM_MULAW:
209	flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
210	break;
211	case AV_CODEC_ID_PCM_ALAW:
212	flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
213	break;
214	case 0:
215	flags |= par->codec_tag << 4;
216	break;
217	default:
218	av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
219	avcodec_get_name(par->codec_id));
220	return AVERROR(EINVAL);
221	}
222
223	return flags;
224	}
225
226	static void put_amf_string(AVIOContext *pb, const char *str)
227	{
228	size_t len = strlen(str);
229	avio_wb16(pb, len);
230	avio_write(pb, str, len);
231	}
232
233	static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
234	{
235	avio_w8(pb, FLV_TAG_TYPE_VIDEO);
236	avio_wb24(pb, 5); /* Tag Data Size */
237	avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
238	avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
239	avio_wb24(pb, 0); /* StreamId = 0 */
240	avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
241	avio_w8(pb, 2); /* AVC end of sequence */
242	avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
243	avio_wb32(pb, 16); /* Size of FLV tag */
244	}
245
246	static void put_amf_double(AVIOContext *pb, double d)
247	{
248	avio_w8(pb, AMF_DATA_TYPE_NUMBER);
249	avio_wb64(pb, av_double2int(d));
250	}
251
252	static void put_amf_byte(AVIOContext *pb, unsigned char abyte)
253	{
254	avio_w8(pb, abyte);
255	}
256
257	static void put_amf_dword_array(AVIOContext *pb, uint32_t dw)
258	{
259	avio_w8(pb, AMF_DATA_TYPE_ARRAY);
260	avio_wb32(pb, dw);
261	}
262
263	static void put_amf_bool(AVIOContext *pb, int b)
264	{
265	avio_w8(pb, AMF_DATA_TYPE_BOOL);
266	avio_w8(pb, !!b);
267	}
268
269	static void write_metadata(AVFormatContext *s, unsigned int ts)
270	{
271	AVIOContext *pb = s->pb;
272	FLVContext *flv = s->priv_data;
273	int write_duration_filesize = !(flv->flags & FLV_NO_DURATION_FILESIZE);
274	int metadata_count = 0;
275	int64_t metadata_count_pos;
276	AVDictionaryEntry *tag = NULL;
277
278	/* write meta_tag */
279	avio_w8(pb, FLV_TAG_TYPE_META); // tag type META
280	flv->metadata_size_pos = avio_tell(pb);
281	avio_wb24(pb, 0); // size of data part (sum of all parts below)
282	avio_wb24(pb, ts); // timestamp
283	avio_wb32(pb, 0); // reserved
284
285	/* now data of data_size size */
286
287	/* first event name as a string */
288	avio_w8(pb, AMF_DATA_TYPE_STRING);
289	put_amf_string(pb, "onMetaData"); // 12 bytes
290
291	/* mixed array (hash) with size and string/type/data tuples */
292	avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
293	metadata_count_pos = avio_tell(pb);
294	metadata_count = 4 * !!flv->video_par +
295	5 * !!flv->audio_par +
296	1 * !!flv->data_par;
297	if (write_duration_filesize) {
298	metadata_count += 2; // +2 for duration and file size
299	}
300	avio_wb32(pb, metadata_count);
301
302	if (write_duration_filesize) {
303	put_amf_string(pb, "duration");
304	flv->duration_offset = avio_tell(pb);
305	// fill in the guessed duration, it'll be corrected later if incorrect
306	put_amf_double(pb, s->duration / AV_TIME_BASE);
307	}
308
309	if (flv->video_par) {
310	put_amf_string(pb, "width");
311	put_amf_double(pb, flv->video_par->width);
312
313	put_amf_string(pb, "height");
314	put_amf_double(pb, flv->video_par->height);
315
316	put_amf_string(pb, "videodatarate");
317	put_amf_double(pb, flv->video_par->bit_rate / 1024.0);
318
319	if (flv->framerate != 0.0) {
320	put_amf_string(pb, "framerate");
321	put_amf_double(pb, flv->framerate);
322	metadata_count++;
323	}
324
325	put_amf_string(pb, "videocodecid");
326	put_amf_double(pb, flv->video_par->codec_tag);
327	}
328
329	if (flv->audio_par) {
330	put_amf_string(pb, "audiodatarate");
331	put_amf_double(pb, flv->audio_par->bit_rate / 1024.0);
332
333	put_amf_string(pb, "audiosamplerate");
334	put_amf_double(pb, flv->audio_par->sample_rate);
335
336	put_amf_string(pb, "audiosamplesize");
337	put_amf_double(pb, flv->audio_par->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
338
339	put_amf_string(pb, "stereo");
340	put_amf_bool(pb, flv->audio_par->channels == 2);
341
342	put_amf_string(pb, "audiocodecid");
343	put_amf_double(pb, flv->audio_par->codec_tag);
344	}
345
346	if (flv->data_par) {
347	put_amf_string(pb, "datastream");
348	put_amf_double(pb, 0.0);
349	}
350
351	ff_standardize_creation_time(s);
352	while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
353	if( !strcmp(tag->key, "width")
354	||!strcmp(tag->key, "height")
355	||!strcmp(tag->key, "videodatarate")
356	||!strcmp(tag->key, "framerate")
357	||!strcmp(tag->key, "videocodecid")
358	||!strcmp(tag->key, "audiodatarate")
359	||!strcmp(tag->key, "audiosamplerate")
360	||!strcmp(tag->key, "audiosamplesize")
361	||!strcmp(tag->key, "stereo")
362	||!strcmp(tag->key, "audiocodecid")
363	||!strcmp(tag->key, "duration")
364	||!strcmp(tag->key, "onMetaData")
365	||!strcmp(tag->key, "datasize")
366	||!strcmp(tag->key, "lasttimestamp")
367	||!strcmp(tag->key, "totalframes")
368	||!strcmp(tag->key, "hasAudio")
369	||!strcmp(tag->key, "hasVideo")
370	||!strcmp(tag->key, "hasCuePoints")
371	||!strcmp(tag->key, "hasMetadata")
372	||!strcmp(tag->key, "hasKeyframes")
373	){
374	av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
375	continue;
376	}
377	put_amf_string(pb, tag->key);
378	avio_w8(pb, AMF_DATA_TYPE_STRING);
379	put_amf_string(pb, tag->value);
380	metadata_count++;
381	}
382
383	if (write_duration_filesize) {
384	put_amf_string(pb, "filesize");
385	flv->filesize_offset = avio_tell(pb);
386	put_amf_double(pb, 0); // delayed write
387	}
388
389	if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
390	flv->acurframeindex = 0;
391	flv->keyframe_index_size = 0;
392
393	put_amf_string(pb, "hasVideo");
394	put_amf_bool(pb, !!flv->video_par);
395	metadata_count++;
396
397	put_amf_string(pb, "hasKeyframes");
398	put_amf_bool(pb, 1);
399	metadata_count++;
400
401	put_amf_string(pb, "hasAudio");
402	put_amf_bool(pb, !!flv->audio_par);
403	metadata_count++;
404
405	put_amf_string(pb, "hasMetadata");
406	put_amf_bool(pb, 1);
407	metadata_count++;
408
409	put_amf_string(pb, "canSeekToEnd");
410	put_amf_bool(pb, 1);
411	metadata_count++;
412
413	put_amf_string(pb, "datasize");
414	flv->datasize_offset = avio_tell(pb);
415	flv->datasize = 0;
416	put_amf_double(pb, flv->datasize);
417	metadata_count++;
418
419	put_amf_string(pb, "videosize");
420	flv->videosize_offset = avio_tell(pb);
421	flv->videosize = 0;
422	put_amf_double(pb, flv->videosize);
423	metadata_count++;
424
425	put_amf_string(pb, "audiosize");
426	flv->audiosize_offset = avio_tell(pb);
427	flv->audiosize = 0;
428	put_amf_double(pb, flv->audiosize);
429	metadata_count++;
430
431	put_amf_string(pb, "lasttimestamp");
432	flv->lasttimestamp_offset = avio_tell(pb);
433	flv->lasttimestamp = 0;
434	put_amf_double(pb, 0);
435	metadata_count++;
436
437	put_amf_string(pb, "lastkeyframetimestamp");
438	flv->lastkeyframetimestamp_offset = avio_tell(pb);
439	flv->lastkeyframetimestamp = 0;
440	put_amf_double(pb, 0);
441	metadata_count++;
442
443	put_amf_string(pb, "lastkeyframelocation");
444	flv->lastkeyframelocation_offset = avio_tell(pb);
445	flv->lastkeyframelocation = 0;
446	put_amf_double(pb, 0);
447	metadata_count++;
448
449	put_amf_string(pb, "keyframes");
450	put_amf_byte(pb, AMF_DATA_TYPE_OBJECT);
451	metadata_count++;
452
453	flv->keyframes_info_offset = avio_tell(pb);
454	}
455
456	put_amf_string(pb, "");
457	avio_w8(pb, AMF_END_OF_OBJECT);
458
459	/* write total size of tag */
460	flv->metadata_totalsize = avio_tell(pb) - flv->metadata_size_pos - 10;
461
462	avio_seek(pb, metadata_count_pos, SEEK_SET);
463	avio_wb32(pb, metadata_count);
464
465	avio_seek(pb, flv->metadata_size_pos, SEEK_SET);
466	avio_wb24(pb, flv->metadata_totalsize);
467	avio_skip(pb, flv->metadata_totalsize + 10 - 3);
468	flv->metadata_totalsize_pos = avio_tell(pb);
469	avio_wb32(pb, flv->metadata_totalsize + 11);
470	}
471
472	static int unsupported_codec(AVFormatContext *s,
473	const char* type, int codec_id)
474	{
475	const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
476	av_log(s, AV_LOG_ERROR,
477	"%s codec %s not compatible with flv\n",
478	type,
479	desc ? desc->name : "unknown");
480	return AVERROR(ENOSYS);
481	}
482
483	static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
484	int64_t data_size;
485	AVIOContext *pb = s->pb;
486	FLVContext *flv = s->priv_data;
487
488	if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
489	|| par->codec_id == AV_CODEC_ID_MPEG4) {
490	int64_t pos;
491	avio_w8(pb,
492	par->codec_type == AVMEDIA_TYPE_VIDEO ?
493	FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
494	avio_wb24(pb, 0); // size patched later
495	avio_wb24(pb, 0); // ts
496	avio_w8(pb, 0); // ts ext
497	avio_wb24(pb, 0); // streamid
498	pos = avio_tell(pb);
499	if (par->codec_id == AV_CODEC_ID_AAC) {
500	avio_w8(pb, get_audio_flags(s, par));
501	avio_w8(pb, 0); // AAC sequence header
502
503	if (!par->extradata_size && (flv->flags & FLV_AAC_SEQ_HEADER_DETECT)) {
504	PutBitContext pbc;
505	int samplerate_index;
506	int channels = flv->audio_par->channels
507	- (flv->audio_par->channels == 8 ? 1 : 0);
508	uint8_t data[2];
509
510	for (samplerate_index = 0; samplerate_index < 16;
511	samplerate_index++)
512	if (flv->audio_par->sample_rate
513	== mpeg4audio_sample_rates[samplerate_index])
514	break;
515
516	init_put_bits(&pbc, data, sizeof(data));
517	put_bits(&pbc, 5, flv->audio_par->profile + 1); //profile
518	put_bits(&pbc, 4, samplerate_index); //sample rate index
519	put_bits(&pbc, 4, channels);
520	put_bits(&pbc, 1, 0); //frame length - 1024 samples
521	put_bits(&pbc, 1, 0); //does not depend on core coder
522	put_bits(&pbc, 1, 0); //is not extension
523	flush_put_bits(&pbc);
524
525	avio_w8(pb, data[0]);
526	avio_w8(pb, data[1]);
527
528	av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n",
529	data[0], data[1]);
530	}
531	avio_write(pb, par->extradata, par->extradata_size);
532	} else {
533	avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
534	avio_w8(pb, 0); // AVC sequence header
535	avio_wb24(pb, 0); // composition time
536	ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
537	}
538	data_size = avio_tell(pb) - pos;
539	avio_seek(pb, -data_size - 10, SEEK_CUR);
540	avio_wb24(pb, data_size);
541	avio_skip(pb, data_size + 10 - 3);
542	avio_wb32(pb, data_size + 11); // previous tag size
543	}
544	}
545
546	static int flv_append_keyframe_info(AVFormatContext *s, FLVContext *flv, double ts, int64_t pos)
547	{
548	FLVFileposition *position = av_malloc(sizeof(FLVFileposition));
549
550	if (!position) {
551	av_log(s, AV_LOG_WARNING, "no mem for add keyframe index!\n");
552	return AVERROR(ENOMEM);
553	}
554
555	position->keyframe_timestamp = ts;
556	position->keyframe_position = pos;
557
558	if (!flv->filepositions_count) {
559	flv->filepositions = position;
560	flv->head_filepositions = flv->filepositions;
561	position->next = NULL;
562	} else {
563	flv->filepositions->next = position;
564	position->next = NULL;
565	flv->filepositions = flv->filepositions->next;
566	}
567
568	flv->filepositions_count++;
569
570	return 0;
571	}
572
573	static int shift_data(AVFormatContext *s)
574	{
575	int ret = 0;
576	int n = 0;
577	int64_t metadata_size = 0;
578	FLVContext *flv = s->priv_data;
579	int64_t pos, pos_end = avio_tell(s->pb);
580	uint8_t *buf, *read_buf[2];
581	int read_buf_id = 0;
582	int read_size[2];
583	AVIOContext *read_pb;
584
585	metadata_size = flv->filepositions_count * 9 * 2 + 10; /* filepositions and times value */
586	metadata_size += 2 + 13; /* filepositions String */
587	metadata_size += 2 + 5; /* times String */
588	metadata_size += 3; /* Object end */
589
590	flv->keyframe_index_size = metadata_size;
591
592	if (metadata_size < 0)
593	return metadata_size;
594
595	buf = av_malloc_array(metadata_size, 2);
596	if (!buf) {
597	return AVERROR(ENOMEM);
598	}
599	read_buf[0] = buf;
600	read_buf[1] = buf + metadata_size;
601
602	avio_seek(s->pb, flv->metadata_size_pos, SEEK_SET);
603	avio_wb24(s->pb, flv->metadata_totalsize + metadata_size);
604
605	avio_seek(s->pb, flv->metadata_totalsize_pos, SEEK_SET);
606	avio_wb32(s->pb, flv->metadata_totalsize + 11 + metadata_size);
607	avio_seek(s->pb, pos_end, SEEK_SET);
608
609	/* Shift the data: the AVIO context of the output can only be used for
610	* writing, so we re-open the same output, but for reading. It also avoids
611	* a read/seek/write/seek back and forth. */
612	avio_flush(s->pb);
613	ret = s->io_open(s, &read_pb, s->filename, AVIO_FLAG_READ, NULL);
614	if (ret < 0) {
615	av_log(s, AV_LOG_ERROR, "Unable to re-open %s output file for "
616	"the second pass (add_keyframe_index)\n", s->filename);
617	goto end;
618	}
619
620	/* mark the end of the shift to up to the last data we wrote, and get ready
621	* for writing */
622	pos_end = avio_tell(s->pb);
623	avio_seek(s->pb, flv->keyframes_info_offset + metadata_size, SEEK_SET);
624
625	/* start reading at where the keyframe index information will be placed */
626	avio_seek(read_pb, flv->keyframes_info_offset, SEEK_SET);
627	pos = avio_tell(read_pb);
628
629	#define READ_BLOCK do { \
630	read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
631	read_buf_id ^= 1; \
632	} while (0)
633
634	/* shift data by chunk of at most keyframe *filepositions* and *times* size */
635	READ_BLOCK;
636	do {
637	READ_BLOCK;
638	n = read_size[read_buf_id];
639	if (n < 0)
640	break;
641	avio_write(s->pb, read_buf[read_buf_id], n);
642	pos += n;
643	} while (pos <= pos_end);
644
645	ff_format_io_close(s, &read_pb);
646
647	end:
648	av_free(buf);
649	return ret;
650	}
651
652
653	static int flv_write_header(AVFormatContext *s)
654	{
655	int i;
656	AVIOContext *pb = s->pb;
657	FLVContext *flv = s->priv_data;
658
659	for (i = 0; i < s->nb_streams; i++) {
660	AVCodecParameters *par = s->streams[i]->codecpar;
661	FLVStreamContext *sc;
662	switch (par->codec_type) {
663	case AVMEDIA_TYPE_VIDEO:
664	if (s->streams[i]->avg_frame_rate.den &&
665	s->streams[i]->avg_frame_rate.num) {
666	flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
667	}
668	if (flv->video_par) {
669	av_log(s, AV_LOG_ERROR,
670	"at most one video stream is supported in flv\n");
671	return AVERROR(EINVAL);
672	}
673	flv->video_par = par;
674	if (!ff_codec_get_tag(flv_video_codec_ids, par->codec_id))
675	return unsupported_codec(s, "Video", par->codec_id);
676
677	if (par->codec_id == AV_CODEC_ID_MPEG4 ||
678	par->codec_id == AV_CODEC_ID_H263) {
679	int error = s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
680	av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
681	"Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(par->codec_id));
682
683	if (error) {
684	av_log(s, AV_LOG_ERROR,
685	"use vstrict=-1 / -strict -1 to use it anyway.\n");
686	return AVERROR(EINVAL);
687	}
688	} else if (par->codec_id == AV_CODEC_ID_VP6) {
689	av_log(s, AV_LOG_WARNING,
690	"Muxing VP6 in flv will produce flipped video on playback.\n");
691	}
692	break;
693	case AVMEDIA_TYPE_AUDIO:
694	if (flv->audio_par) {
695	av_log(s, AV_LOG_ERROR,
696	"at most one audio stream is supported in flv\n");
697	return AVERROR(EINVAL);
698	}
699	flv->audio_par = par;
700	if (get_audio_flags(s, par) < 0)
701	return unsupported_codec(s, "Audio", par->codec_id);
702	if (par->codec_id == AV_CODEC_ID_PCM_S16BE)
703	av_log(s, AV_LOG_WARNING,
704	"16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
705	break;
706	case AVMEDIA_TYPE_DATA:
707	if (par->codec_id != AV_CODEC_ID_TEXT && par->codec_id != AV_CODEC_ID_NONE)
708	return unsupported_codec(s, "Data", par->codec_id);
709	flv->data_par = par;
710	break;
711	case AVMEDIA_TYPE_SUBTITLE:
712	if (par->codec_id != AV_CODEC_ID_TEXT) {
713	av_log(s, AV_LOG_ERROR, "Subtitle codec '%s' for stream %d is not compatible with FLV\n",
714	avcodec_get_name(par->codec_id), i);
715	return AVERROR_INVALIDDATA;
716	}
717	flv->data_par = par;
718	break;
719	default:
720	av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
721	av_get_media_type_string(par->codec_type), i);
722	return AVERROR(EINVAL);
723	}
724	avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
725
726	sc = av_mallocz(sizeof(FLVStreamContext));
727	if (!sc)
728	return AVERROR(ENOMEM);
729	s->streams[i]->priv_data = sc;
730	sc->last_ts = -1;
731	}
732
733	flv->delay = AV_NOPTS_VALUE;
734
735	avio_write(pb, "FLV", 3);
736	avio_w8(pb, 1);
737	avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_par +
738	FLV_HEADER_FLAG_HASVIDEO * !!flv->video_par);
739	avio_wb32(pb, 9);
740	avio_wb32(pb, 0);
741
742	for (i = 0; i < s->nb_streams; i++)
743	if (s->streams[i]->codecpar->codec_tag == 5) {
744	avio_w8(pb, 8); // message type
745	avio_wb24(pb, 0); // include flags
746	avio_wb24(pb, 0); // time stamp
747	avio_wb32(pb, 0); // reserved
748	avio_wb32(pb, 11); // size
749	flv->reserved = 5;
750	}
751
752	if (flv->flags & FLV_NO_METADATA) {
753	pb->seekable = 0;
754	} else {
755	write_metadata(s, 0);
756	}
757
758	for (i = 0; i < s->nb_streams; i++) {
759	flv_write_codec_header(s, s->streams[i]->codecpar);
760	}
761
762	flv->datastart_offset = avio_tell(pb);
763	return 0;
764	}
765
766	static int flv_write_trailer(AVFormatContext *s)
767	{
768	int64_t file_size;
769	AVIOContext *pb = s->pb;
770	FLVContext *flv = s->priv_data;
771	int build_keyframes_idx = flv->flags & FLV_ADD_KEYFRAME_INDEX;
772	int i, res;
773	int64_t cur_pos = avio_tell(s->pb);
774
775	if (build_keyframes_idx) {
776	FLVFileposition *newflv_posinfo, *p;
777
778	avio_seek(pb, flv->videosize_offset, SEEK_SET);
779	put_amf_double(pb, flv->videosize);
780
781	avio_seek(pb, flv->audiosize_offset, SEEK_SET);
782	put_amf_double(pb, flv->audiosize);
783
784	avio_seek(pb, flv->lasttimestamp_offset, SEEK_SET);
785	put_amf_double(pb, flv->lasttimestamp);
786
787	avio_seek(pb, flv->lastkeyframetimestamp_offset, SEEK_SET);
788	put_amf_double(pb, flv->lastkeyframetimestamp);
789
790	avio_seek(pb, flv->lastkeyframelocation_offset, SEEK_SET);
791	put_amf_double(pb, flv->lastkeyframelocation + flv->keyframe_index_size);
792	avio_seek(pb, cur_pos, SEEK_SET);
793
794	res = shift_data(s);
795	if (res < 0) {
796	goto end;
797	}
798	avio_seek(pb, flv->keyframes_info_offset, SEEK_SET);
799	put_amf_string(pb, "filepositions");
800	put_amf_dword_array(pb, flv->filepositions_count);
801	for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
802	put_amf_double(pb, newflv_posinfo->keyframe_position + flv->keyframe_index_size);
803	}
804
805	put_amf_string(pb, "times");
806	put_amf_dword_array(pb, flv->filepositions_count);
807	for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
808	put_amf_double(pb, newflv_posinfo->keyframe_timestamp);
809	}
810
811	newflv_posinfo = flv->head_filepositions;
812	while (newflv_posinfo) {
813	p = newflv_posinfo->next;
814	if (p) {
815	newflv_posinfo->next = p->next;
816	av_free(p);
817	p = NULL;
818	} else {
819	av_free(newflv_posinfo);
820	newflv_posinfo = NULL;
821	}
822	}
823
824	put_amf_string(pb, "");
825	avio_w8(pb, AMF_END_OF_OBJECT);
826
827	avio_seek(pb, cur_pos + flv->keyframe_index_size, SEEK_SET);
828	}
829
830	end:
831	if (flv->flags & FLV_NO_SEQUENCE_END) {
832	av_log(s, AV_LOG_DEBUG, "FLV no sequence end mode open\n");
833	} else {
834	/* Add EOS tag */
835	for (i = 0; i < s->nb_streams; i++) {
836	AVCodecParameters *par = s->streams[i]->codecpar;
837	FLVStreamContext *sc = s->streams[i]->priv_data;
838	if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
839	(par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
840	put_avc_eos_tag(pb, sc->last_ts);
841	}
842	}
843
844	file_size = avio_tell(pb);
845
846	if (build_keyframes_idx) {
847	flv->datasize = file_size - flv->datastart_offset;
848	avio_seek(pb, flv->datasize_offset, SEEK_SET);
849	put_amf_double(pb, flv->datasize);
850	}
851	if (!(flv->flags & FLV_NO_METADATA)) {
852	if (!(flv->flags & FLV_NO_DURATION_FILESIZE)) {
853	/* update information */
854	if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0) {
855	av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
856	} else {
857	put_amf_double(pb, flv->duration / (double)1000);
858	}
859	if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0) {
860	av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
861	} else {
862	put_amf_double(pb, file_size);
863	}
864	}
865	}
866
867	return 0;
868	}
869
870	static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
871	{
872	AVIOContext *pb = s->pb;
873	AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
874	FLVContext *flv = s->priv_data;
875	FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
876	unsigned ts;
877	int size = pkt->size;
878	uint8_t *data = NULL;
879	int flags = -1, flags_size, ret;
880	int64_t cur_offset = avio_tell(pb);
881
882	if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
883	par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC)
884	flags_size = 2;
885	else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4)
886	flags_size = 5;
887	else
888	flags_size = 1;
889
890	if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
891	|| par->codec_id == AV_CODEC_ID_MPEG4) {
892	int side_size = 0;
893	uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
894	if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) {
895	av_free(par->extradata);
896	par->extradata = av_mallocz(side_size + AV_INPUT_BUFFER_PADDING_SIZE);
897	if (!par->extradata) {
898	par->extradata_size = 0;
899	return AVERROR(ENOMEM);
900	}
901	memcpy(par->extradata, side, side_size);
902	par->extradata_size = side_size;
903	flv_write_codec_header(s, par);
904	}
905	}
906
907	if (flv->delay == AV_NOPTS_VALUE)
908	flv->delay = -pkt->dts;
909
910	if (pkt->dts < -flv->delay) {
911	av_log(s, AV_LOG_WARNING,
912	"Packets are not in the proper order with respect to DTS\n");
913	return AVERROR(EINVAL);
914	}
915
916	ts = pkt->dts;
917
918	if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
919	write_metadata(s, ts);
920	s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
921	}
922
923	avio_write_marker(pb, av_rescale(ts, AV_TIME_BASE, 1000),
924	pkt->flags & AV_PKT_FLAG_KEY && (flv->video_par ? par->codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
925
926	switch (par->codec_type) {
927	case AVMEDIA_TYPE_VIDEO:
928	avio_w8(pb, FLV_TAG_TYPE_VIDEO);
929
930	flags = ff_codec_get_tag(flv_video_codec_ids, par->codec_id);
931
932	flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
933	break;
934	case AVMEDIA_TYPE_AUDIO:
935	flags = get_audio_flags(s, par);
936
937	av_assert0(size);
938
939	avio_w8(pb, FLV_TAG_TYPE_AUDIO);
940	break;
941	case AVMEDIA_TYPE_SUBTITLE:
942	case AVMEDIA_TYPE_DATA:
943	avio_w8(pb, FLV_TAG_TYPE_META);
944	break;
945	default:
946	return AVERROR(EINVAL);
947	}
948
949	if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
950	/* check if extradata looks like mp4 formatted */
951	if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
952	if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
953	return ret;
954	} else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
955	(AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
956	if (!s->streams[pkt->stream_index]->nb_frames) {
957	av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
958	"use the audio bitstream filter 'aac_adtstoasc' to fix it "
959	"('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
960	return AVERROR_INVALIDDATA;
961	}
962	av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
963	}
964
965	/* check Speex packet duration */
966	if (par->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
967	av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
968	"8 frames per packet. Adobe Flash "
969	"Player cannot handle this!\n");
970
971	if (sc->last_ts < ts)
972	sc->last_ts = ts;
973
974	if (size + flags_size >= 1<<24) {
975	av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n",
976	size + flags_size, 1<<24);
977	return AVERROR(EINVAL);
978	}
979
980	avio_wb24(pb, size + flags_size);
981	avio_wb24(pb, ts & 0xFFFFFF);
982	avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
983	avio_wb24(pb, flv->reserved);
984
985	if (par->codec_type == AVMEDIA_TYPE_DATA ||
986	par->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
987	int data_size;
988	int64_t metadata_size_pos = avio_tell(pb);
989	if (par->codec_id == AV_CODEC_ID_TEXT) {
990	// legacy FFmpeg magic?
991	avio_w8(pb, AMF_DATA_TYPE_STRING);
992	put_amf_string(pb, "onTextData");
993	avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
994	avio_wb32(pb, 2);
995	put_amf_string(pb, "type");
996	avio_w8(pb, AMF_DATA_TYPE_STRING);
997	put_amf_string(pb, "Text");
998	put_amf_string(pb, "text");
999	avio_w8(pb, AMF_DATA_TYPE_STRING);
1000	put_amf_string(pb, pkt->data);
1001	put_amf_string(pb, "");
1002	avio_w8(pb, AMF_END_OF_OBJECT);
1003	} else {
1004	// just pass the metadata through
1005	avio_write(pb, data ? data : pkt->data, size);
1006	}
1007	/* write total size of tag */
1008	data_size = avio_tell(pb) - metadata_size_pos;
1009	avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
1010	avio_wb24(pb, data_size);
1011	avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
1012	avio_wb32(pb, data_size + 11);
1013	} else {
1014	av_assert1(flags>=0);
1015	avio_w8(pb,flags);
1016	if (par->codec_id == AV_CODEC_ID_VP6)
1017	avio_w8(pb,0);
1018	if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A) {
1019	if (par->extradata_size)
1020	avio_w8(pb, par->extradata[0]);
1021	else
1022	avio_w8(pb, ((FFALIGN(par->width, 16) - par->width) << 4) |
1023	(FFALIGN(par->height, 16) - par->height));
1024	} else if (par->codec_id == AV_CODEC_ID_AAC)
1025	avio_w8(pb, 1); // AAC raw
1026	else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
1027	avio_w8(pb, 1); // AVC NALU
1028	avio_wb24(pb, pkt->pts - pkt->dts);
1029	}
1030
1031	avio_write(pb, data ? data : pkt->data, size);
1032
1033	avio_wb32(pb, size + flags_size + 11); // previous tag size
1034	flv->duration = FFMAX(flv->duration,
1035	pkt->pts + flv->delay + pkt->duration);
1036	}
1037
1038	if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
1039	switch (par->codec_type) {
1040	case AVMEDIA_TYPE_VIDEO:
1041	flv->videosize += (avio_tell(pb) - cur_offset);
1042	flv->lasttimestamp = flv->acurframeindex / flv->framerate;
1043	if (pkt->flags & AV_PKT_FLAG_KEY) {
1044	double ts = flv->acurframeindex / flv->framerate;
1045	int64_t pos = cur_offset;
1046
1047	flv->lastkeyframetimestamp = flv->acurframeindex / flv->framerate;
1048	flv->lastkeyframelocation = pos;
1049	flv_append_keyframe_info(s, flv, ts, pos);
1050	}
1051	flv->acurframeindex++;
1052	break;
1053
1054	case AVMEDIA_TYPE_AUDIO:
1055	flv->audiosize += (avio_tell(pb) - cur_offset);
1056	break;
1057
1058	default:
1059	av_log(s, AV_LOG_WARNING, "par->codec_type is type = [%d]\n", par->codec_type);
1060	break;
1061	}
1062	}
1063
1064	av_free(data);
1065
1066	return pb->error;
1067	}
1068
1069	static const AVOption options[] = {
1070	{ "flvflags", "FLV muxer flags", offsetof(FLVContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1071	{ "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_AAC_SEQ_HEADER_DETECT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1072	{ "no_sequence_end", "disable sequence end for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_SEQUENCE_END}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1073	{ "no_metadata", "disable metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_METADATA}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1074	{ "no_duration_filesize", "disable duration and filesize zero value metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_DURATION_FILESIZE}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1075	{ "add_keyframe_index", "Add keyframe index metadata", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_ADD_KEYFRAME_INDEX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1076	{ NULL },
1077	};
1078
1079	static const AVClass flv_muxer_class = {
1080	.class_name = "flv muxer",
1081	.item_name = av_default_item_name,
1082	.option = options,
1083	.version = LIBAVUTIL_VERSION_INT,
1084	};
1085
1086	AVOutputFormat ff_flv_muxer = {
1087	.name = "flv",
1088	.long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1089	.mime_type = "video/x-flv",
1090	.extensions = "flv",
1091	.priv_data_size = sizeof(FLVContext),
1092	.audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
1093	.video_codec = AV_CODEC_ID_FLV1,
1094	.write_header = flv_write_header,
1095	.write_packet = flv_write_packet,
1096	.write_trailer = flv_write_trailer,
1097	.codec_tag = (const AVCodecTag* const []) {
1098	flv_video_codec_ids, flv_audio_codec_ids, 0
1099	},
1100	.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1101	AVFMT_TS_NONSTRICT,
1102	.priv_class = &flv_muxer_class,
1103	};
1104