path: root/libavcodec/mpeg12dec.c (plain)
blob: e49167f89eb3a41f8d2aadf09c74a87724ed618f

1	/*
2	* MPEG-1/2 decoder
3	* Copyright (c) 2000, 2001 Fabrice Bellard
4	* Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5	*
6	* This file is part of FFmpeg.
7	*
8	* FFmpeg is free software; you can redistribute it and/or
9	* modify it under the terms of the GNU Lesser General Public
10	* License as published by the Free Software Foundation; either
11	* version 2.1 of the License, or (at your option) any later version.
12	*
13	* FFmpeg is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16	* Lesser General Public License for more details.
17	*
18	* You should have received a copy of the GNU Lesser General Public
19	* License along with FFmpeg; if not, write to the Free Software
20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21	*/
22
23	/**
24	* @file
25	* MPEG-1/2 decoder
26	*/
27
28	#define UNCHECKED_BITSTREAM_READER 1
29	#include <inttypes.h>
30
31	#include "libavutil/attributes.h"
32	#include "libavutil/imgutils.h"
33	#include "libavutil/internal.h"
34	#include "libavutil/stereo3d.h"
35
36	#include "avcodec.h"
37	#include "bytestream.h"
38	#include "error_resilience.h"
39	#include "idctdsp.h"
40	#include "internal.h"
41	#include "mpeg_er.h"
42	#include "mpeg12.h"
43	#include "mpeg12data.h"
44	#include "mpegutils.h"
45	#include "mpegvideo.h"
46	#include "mpegvideodata.h"
47	#include "profiles.h"
48	#include "thread.h"
49	#include "version.h"
50	#include "vdpau_compat.h"
51	#include "xvmc_internal.h"
52
53	typedef struct Mpeg1Context {
54	MpegEncContext mpeg_enc_ctx;
55	int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
56	int repeat_field; /* true if we must repeat the field */
57	AVPanScan pan_scan; /* some temporary storage for the panscan */
58	AVStereo3D stereo3d;
59	int has_stereo3d;
60	uint8_t *a53_caption;
61	int a53_caption_size;
62	uint8_t afd;
63	int has_afd;
64	int slice_count;
65	AVRational save_aspect;
66	int save_width, save_height, save_progressive_seq;
67	AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
68	int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
69	int tmpgexs;
70	int first_slice;
71	int extradata_decoded;
72	} Mpeg1Context;
73
74	#define MB_TYPE_ZERO_MV 0x20000000
75
76	static const uint32_t ptype2mb_type[7] = {
77	MB_TYPE_INTRA,
78	MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
79	MB_TYPE_L0,
80	MB_TYPE_L0 | MB_TYPE_CBP,
81	MB_TYPE_QUANT | MB_TYPE_INTRA,
82	MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
83	MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
84	};
85
86	static const uint32_t btype2mb_type[11] = {
87	MB_TYPE_INTRA,
88	MB_TYPE_L1,
89	MB_TYPE_L1 | MB_TYPE_CBP,
90	MB_TYPE_L0,
91	MB_TYPE_L0 | MB_TYPE_CBP,
92	MB_TYPE_L0L1,
93	MB_TYPE_L0L1 | MB_TYPE_CBP,
94	MB_TYPE_QUANT | MB_TYPE_INTRA,
95	MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
96	MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
97	MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
98	};
99
100	/* as H.263, but only 17 codes */
101	static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
102	{
103	int code, sign, val, shift;
104
105	code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
106	if (code == 0)
107	return pred;
108	if (code < 0)
109	return 0xffff;
110
111	sign = get_bits1(&s->gb);
112	shift = fcode - 1;
113	val = code;
114	if (shift) {
115	val = (val - 1) << shift;
116	val |= get_bits(&s->gb, shift);
117	val++;
118	}
119	if (sign)
120	val = -val;
121	val += pred;
122
123	/* modulo decoding */
124	return sign_extend(val, 5 + shift);
125	}
126
127	#define MAX_INDEX (64 - 1)
128	#define check_scantable_index(ctx, x) \
129	do { \
130	if ((x) > MAX_INDEX) { \
131	av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
132	ctx->mb_x, ctx->mb_y); \
133	return AVERROR_INVALIDDATA; \
134	} \
135	} while (0)
136
137	static inline int mpeg1_decode_block_inter(MpegEncContext *s,
138	int16_t *block, int n)
139	{
140	int level, i, j, run;
141	RLTable *rl = &ff_rl_mpeg1;
142	uint8_t *const scantable = s->intra_scantable.permutated;
143	const uint16_t *quant_matrix = s->inter_matrix;
144	const int qscale = s->qscale;
145
146	{
147	OPEN_READER(re, &s->gb);
148	i = -1;
149	// special case for first coefficient, no need to add second VLC table
150	UPDATE_CACHE(re, &s->gb);
151	if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
152	level = (3 * qscale * quant_matrix[0]) >> 5;
153	level = (level - 1) | 1;
154	if (GET_CACHE(re, &s->gb) & 0x40000000)
155	level = -level;
156	block[0] = level;
157	i++;
158	SKIP_BITS(re, &s->gb, 2);
159	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
160	goto end;
161	}
162	/* now quantify & encode AC coefficients */
163	for (;;) {
164	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
165	TEX_VLC_BITS, 2, 0);
166
167	if (level != 0) {
168	i += run;
169	if (i > MAX_INDEX)
170	break;
171	j = scantable[i];
172	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
173	level = (level - 1) | 1;
174	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
175	SHOW_SBITS(re, &s->gb, 1);
176	SKIP_BITS(re, &s->gb, 1);
177	} else {
178	/* escape */
179	run = SHOW_UBITS(re, &s->gb, 6) + 1;
180	LAST_SKIP_BITS(re, &s->gb, 6);
181	UPDATE_CACHE(re, &s->gb);
182	level = SHOW_SBITS(re, &s->gb, 8);
183	SKIP_BITS(re, &s->gb, 8);
184	if (level == -128) {
185	level = SHOW_UBITS(re, &s->gb, 8) - 256;
186	SKIP_BITS(re, &s->gb, 8);
187	} else if (level == 0) {
188	level = SHOW_UBITS(re, &s->gb, 8);
189	SKIP_BITS(re, &s->gb, 8);
190	}
191	i += run;
192	if (i > MAX_INDEX)
193	break;
194	j = scantable[i];
195	if (level < 0) {
196	level = -level;
197	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
198	level = (level - 1) | 1;
199	level = -level;
200	} else {
201	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
202	level = (level - 1) | 1;
203	}
204	}
205
206	block[j] = level;
207	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
208	break;
209	UPDATE_CACHE(re, &s->gb);
210	}
211	end:
212	LAST_SKIP_BITS(re, &s->gb, 2);
213	CLOSE_READER(re, &s->gb);
214	}
215
216	check_scantable_index(s, i);
217
218	s->block_last_index[n] = i;
219	return 0;
220	}
221
222	/**
223	* Note: this function can read out of range and crash for corrupt streams.
224	* Changing this would eat up any speed benefits it has.
225	* Do not use "fast" flag if you need the code to be robust.
226	*/
227	static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
228	int16_t *block, int n)
229	{
230	int level, i, j, run;
231	RLTable *rl = &ff_rl_mpeg1;
232	uint8_t *const scantable = s->intra_scantable.permutated;
233	const int qscale = s->qscale;
234
235	{
236	OPEN_READER(re, &s->gb);
237	i = -1;
238	// Special case for first coefficient, no need to add second VLC table.
239	UPDATE_CACHE(re, &s->gb);
240	if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
241	level = (3 * qscale) >> 1;
242	level = (level - 1) | 1;
243	if (GET_CACHE(re, &s->gb) & 0x40000000)
244	level = -level;
245	block[0] = level;
246	i++;
247	SKIP_BITS(re, &s->gb, 2);
248	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
249	goto end;
250	}
251
252	/* now quantify & encode AC coefficients */
253	for (;;) {
254	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
255	TEX_VLC_BITS, 2, 0);
256
257	if (level != 0) {
258	i += run;
259	if (i > MAX_INDEX)
260	break;
261	j = scantable[i];
262	level = ((level * 2 + 1) * qscale) >> 1;
263	level = (level - 1) | 1;
264	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265	SHOW_SBITS(re, &s->gb, 1);
266	SKIP_BITS(re, &s->gb, 1);
267	} else {
268	/* escape */
269	run = SHOW_UBITS(re, &s->gb, 6) + 1;
270	LAST_SKIP_BITS(re, &s->gb, 6);
271	UPDATE_CACHE(re, &s->gb);
272	level = SHOW_SBITS(re, &s->gb, 8);
273	SKIP_BITS(re, &s->gb, 8);
274	if (level == -128) {
275	level = SHOW_UBITS(re, &s->gb, 8) - 256;
276	SKIP_BITS(re, &s->gb, 8);
277	} else if (level == 0) {
278	level = SHOW_UBITS(re, &s->gb, 8);
279	SKIP_BITS(re, &s->gb, 8);
280	}
281	i += run;
282	if (i > MAX_INDEX)
283	break;
284	j = scantable[i];
285	if (level < 0) {
286	level = -level;
287	level = ((level * 2 + 1) * qscale) >> 1;
288	level = (level - 1) | 1;
289	level = -level;
290	} else {
291	level = ((level * 2 + 1) * qscale) >> 1;
292	level = (level - 1) | 1;
293	}
294	}
295
296	block[j] = level;
297	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298	break;
299	UPDATE_CACHE(re, &s->gb);
300	}
301	end:
302	LAST_SKIP_BITS(re, &s->gb, 2);
303	CLOSE_READER(re, &s->gb);
304	}
305
306	check_scantable_index(s, i);
307
308	s->block_last_index[n] = i;
309	return 0;
310	}
311
312	static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
313	int16_t *block, int n)
314	{
315	int level, i, j, run;
316	RLTable *rl = &ff_rl_mpeg1;
317	uint8_t *const scantable = s->intra_scantable.permutated;
318	const uint16_t *quant_matrix;
319	const int qscale = s->qscale;
320	int mismatch;
321
322	mismatch = 1;
323
324	{
325	OPEN_READER(re, &s->gb);
326	i = -1;
327	if (n < 4)
328	quant_matrix = s->inter_matrix;
329	else
330	quant_matrix = s->chroma_inter_matrix;
331
332	// Special case for first coefficient, no need to add second VLC table.
333	UPDATE_CACHE(re, &s->gb);
334	if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
335	level = (3 * qscale * quant_matrix[0]) >> 5;
336	if (GET_CACHE(re, &s->gb) & 0x40000000)
337	level = -level;
338	block[0] = level;
339	mismatch ^= level;
340	i++;
341	SKIP_BITS(re, &s->gb, 2);
342	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
343	goto end;
344	}
345
346	/* now quantify & encode AC coefficients */
347	for (;;) {
348	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
349	TEX_VLC_BITS, 2, 0);
350
351	if (level != 0) {
352	i += run;
353	if (i > MAX_INDEX)
354	break;
355	j = scantable[i];
356	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
357	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
358	SHOW_SBITS(re, &s->gb, 1);
359	SKIP_BITS(re, &s->gb, 1);
360	} else {
361	/* escape */
362	run = SHOW_UBITS(re, &s->gb, 6) + 1;
363	LAST_SKIP_BITS(re, &s->gb, 6);
364	UPDATE_CACHE(re, &s->gb);
365	level = SHOW_SBITS(re, &s->gb, 12);
366	SKIP_BITS(re, &s->gb, 12);
367
368	i += run;
369	if (i > MAX_INDEX)
370	break;
371	j = scantable[i];
372	if (level < 0) {
373	level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
374	level = -level;
375	} else {
376	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
377	}
378	}
379
380	mismatch ^= level;
381	block[j] = level;
382	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383	break;
384	UPDATE_CACHE(re, &s->gb);
385	}
386	end:
387	LAST_SKIP_BITS(re, &s->gb, 2);
388	CLOSE_READER(re, &s->gb);
389	}
390	block[63] ^= (mismatch & 1);
391
392	check_scantable_index(s, i);
393
394	s->block_last_index[n] = i;
395	return 0;
396	}
397
398	/**
399	* Note: this function can read out of range and crash for corrupt streams.
400	* Changing this would eat up any speed benefits it has.
401	* Do not use "fast" flag if you need the code to be robust.
402	*/
403	static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
404	int16_t *block, int n)
405	{
406	int level, i, j, run;
407	RLTable *rl = &ff_rl_mpeg1;
408	uint8_t *const scantable = s->intra_scantable.permutated;
409	const int qscale = s->qscale;
410	OPEN_READER(re, &s->gb);
411	i = -1;
412
413	// special case for first coefficient, no need to add second VLC table
414	UPDATE_CACHE(re, &s->gb);
415	if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416	level = (3 * qscale) >> 1;
417	if (GET_CACHE(re, &s->gb) & 0x40000000)
418	level = -level;
419	block[0] = level;
420	i++;
421	SKIP_BITS(re, &s->gb, 2);
422	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
423	goto end;
424	}
425
426	/* now quantify & encode AC coefficients */
427	for (;;) {
428	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
429
430	if (level != 0) {
431	i += run;
432	if (i > MAX_INDEX)
433	break;
434	j = scantable[i];
435	level = ((level * 2 + 1) * qscale) >> 1;
436	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
437	SHOW_SBITS(re, &s->gb, 1);
438	SKIP_BITS(re, &s->gb, 1);
439	} else {
440	/* escape */
441	run = SHOW_UBITS(re, &s->gb, 6) + 1;
442	LAST_SKIP_BITS(re, &s->gb, 6);
443	UPDATE_CACHE(re, &s->gb);
444	level = SHOW_SBITS(re, &s->gb, 12);
445	SKIP_BITS(re, &s->gb, 12);
446
447	i += run;
448	if (i > MAX_INDEX)
449	break;
450	j = scantable[i];
451	if (level < 0) {
452	level = ((-level * 2 + 1) * qscale) >> 1;
453	level = -level;
454	} else {
455	level = ((level * 2 + 1) * qscale) >> 1;
456	}
457	}
458
459	block[j] = level;
460	if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
461	break;
462
463	UPDATE_CACHE(re, &s->gb);
464	}
465	end:
466	LAST_SKIP_BITS(re, &s->gb, 2);
467	CLOSE_READER(re, &s->gb);
468
469	check_scantable_index(s, i);
470
471	s->block_last_index[n] = i;
472	return 0;
473	}
474
475	static inline int mpeg2_decode_block_intra(MpegEncContext *s,
476	int16_t *block, int n)
477	{
478	int level, dc, diff, i, j, run;
479	int component;
480	RLTable *rl;
481	uint8_t *const scantable = s->intra_scantable.permutated;
482	const uint16_t *quant_matrix;
483	const int qscale = s->qscale;
484	int mismatch;
485
486	/* DC coefficient */
487	if (n < 4) {
488	quant_matrix = s->intra_matrix;
489	component = 0;
490	} else {
491	quant_matrix = s->chroma_intra_matrix;
492	component = (n & 1) + 1;
493	}
494	diff = decode_dc(&s->gb, component);
495	if (diff >= 0xffff)
496	return AVERROR_INVALIDDATA;
497	dc = s->last_dc[component];
498	dc += diff;
499	s->last_dc[component] = dc;
500	block[0] = dc * (1 << (3 - s->intra_dc_precision));
501	ff_tlog(s->avctx, "dc=%d\n", block[0]);
502	mismatch = block[0] ^ 1;
503	i = 0;
504	if (s->intra_vlc_format)
505	rl = &ff_rl_mpeg2;
506	else
507	rl = &ff_rl_mpeg1;
508
509	{
510	OPEN_READER(re, &s->gb);
511	/* now quantify & encode AC coefficients */
512	for (;;) {
513	UPDATE_CACHE(re, &s->gb);
514	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
515	TEX_VLC_BITS, 2, 0);
516
517	if (level == 127) {
518	break;
519	} else if (level != 0) {
520	i += run;
521	if (i > MAX_INDEX)
522	break;
523	j = scantable[i];
524	level = (level * qscale * quant_matrix[j]) >> 4;
525	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
526	SHOW_SBITS(re, &s->gb, 1);
527	LAST_SKIP_BITS(re, &s->gb, 1);
528	} else {
529	/* escape */
530	run = SHOW_UBITS(re, &s->gb, 6) + 1;
531	LAST_SKIP_BITS(re, &s->gb, 6);
532	UPDATE_CACHE(re, &s->gb);
533	level = SHOW_SBITS(re, &s->gb, 12);
534	SKIP_BITS(re, &s->gb, 12);
535	i += run;
536	if (i > MAX_INDEX)
537	break;
538	j = scantable[i];
539	if (level < 0) {
540	level = (-level * qscale * quant_matrix[j]) >> 4;
541	level = -level;
542	} else {
543	level = (level * qscale * quant_matrix[j]) >> 4;
544	}
545	}
546
547	mismatch ^= level;
548	block[j] = level;
549	}
550	CLOSE_READER(re, &s->gb);
551	}
552	block[63] ^= mismatch & 1;
553
554	check_scantable_index(s, i);
555
556	s->block_last_index[n] = i;
557	return 0;
558	}
559
560	/**
561	* Note: this function can read out of range and crash for corrupt streams.
562	* Changing this would eat up any speed benefits it has.
563	* Do not use "fast" flag if you need the code to be robust.
564	*/
565	static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
566	int16_t *block, int n)
567	{
568	int level, dc, diff, i, j, run;
569	int component;
570	RLTable *rl;
571	uint8_t *const scantable = s->intra_scantable.permutated;
572	const uint16_t *quant_matrix;
573	const int qscale = s->qscale;
574
575	/* DC coefficient */
576	if (n < 4) {
577	quant_matrix = s->intra_matrix;
578	component = 0;
579	} else {
580	quant_matrix = s->chroma_intra_matrix;
581	component = (n & 1) + 1;
582	}
583	diff = decode_dc(&s->gb, component);
584	if (diff >= 0xffff)
585	return AVERROR_INVALIDDATA;
586	dc = s->last_dc[component];
587	dc += diff;
588	s->last_dc[component] = dc;
589	block[0] = dc << (3 - s->intra_dc_precision);
590	i = 0;
591	if (s->intra_vlc_format)
592	rl = &ff_rl_mpeg2;
593	else
594	rl = &ff_rl_mpeg1;
595
596	{
597	OPEN_READER(re, &s->gb);
598	/* now quantify & encode AC coefficients */
599	for (;;) {
600	UPDATE_CACHE(re, &s->gb);
601	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
602	TEX_VLC_BITS, 2, 0);
603
604	if (level >= 64 || i > 63) {
605	break;
606	} else if (level != 0) {
607	i += run;
608	j = scantable[i];
609	level = (level * qscale * quant_matrix[j]) >> 4;
610	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
611	SHOW_SBITS(re, &s->gb, 1);
612	LAST_SKIP_BITS(re, &s->gb, 1);
613	} else {
614	/* escape */
615	run = SHOW_UBITS(re, &s->gb, 6) + 1;
616	LAST_SKIP_BITS(re, &s->gb, 6);
617	UPDATE_CACHE(re, &s->gb);
618	level = SHOW_SBITS(re, &s->gb, 12);
619	SKIP_BITS(re, &s->gb, 12);
620	i += run;
621	j = scantable[i];
622	if (level < 0) {
623	level = (-level * qscale * quant_matrix[j]) >> 4;
624	level = -level;
625	} else {
626	level = (level * qscale * quant_matrix[j]) >> 4;
627	}
628	}
629
630	block[j] = level;
631	}
632	CLOSE_READER(re, &s->gb);
633	}
634
635	check_scantable_index(s, i);
636
637	s->block_last_index[n] = i;
638	return 0;
639	}
640
641	/******************************************/
642	/* decoding */
643
644	static inline int get_dmv(MpegEncContext *s)
645	{
646	if (get_bits1(&s->gb))
647	return 1 - (get_bits1(&s->gb) << 1);
648	else
649	return 0;
650	}
651
652	static inline int get_qscale(MpegEncContext *s)
653	{
654	int qscale = get_bits(&s->gb, 5);
655	if (s->q_scale_type)
656	return ff_mpeg2_non_linear_qscale[qscale];
657	else
658	return qscale << 1;
659	}
660
661
662	/* motion type (for MPEG-2) */
663	#define MT_FIELD 1
664	#define MT_FRAME 2
665	#define MT_16X8 2
666	#define MT_DMV 3
667
668	static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
669	{
670	int i, j, k, cbp, val, mb_type, motion_type;
671	const int mb_block_count = 4 + (1 << s->chroma_format);
672	int ret;
673
674	ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
675
676	av_assert2(s->mb_skipped == 0);
677
678	if (s->mb_skip_run-- != 0) {
679	if (s->pict_type == AV_PICTURE_TYPE_P) {
680	s->mb_skipped = 1;
681	s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
682	MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
683	} else {
684	int mb_type;
685
686	if (s->mb_x)
687	mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
688	else
689	// FIXME not sure if this is allowed in MPEG at all
690	mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
691	if (IS_INTRA(mb_type)) {
692	av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
693	return AVERROR_INVALIDDATA;
694	}
695	s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
696	mb_type | MB_TYPE_SKIP;
697
698	if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
699	s->mb_skipped = 1;
700	}
701
702	return 0;
703	}
704
705	switch (s->pict_type) {
706	default:
707	case AV_PICTURE_TYPE_I:
708	if (get_bits1(&s->gb) == 0) {
709	if (get_bits1(&s->gb) == 0) {
710	av_log(s->avctx, AV_LOG_ERROR,
711	"Invalid mb type in I-frame at %d %d\n",
712	s->mb_x, s->mb_y);
713	return AVERROR_INVALIDDATA;
714	}
715	mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
716	} else {
717	mb_type = MB_TYPE_INTRA;
718	}
719	break;
720	case AV_PICTURE_TYPE_P:
721	mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
722	if (mb_type < 0) {
723	av_log(s->avctx, AV_LOG_ERROR,
724	"Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
725	return AVERROR_INVALIDDATA;
726	}
727	mb_type = ptype2mb_type[mb_type];
728	break;
729	case AV_PICTURE_TYPE_B:
730	mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
731	if (mb_type < 0) {
732	av_log(s->avctx, AV_LOG_ERROR,
733	"Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
734	return AVERROR_INVALIDDATA;
735	}
736	mb_type = btype2mb_type[mb_type];
737	break;
738	}
739	ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
740	// motion_type = 0; /* avoid warning */
741	if (IS_INTRA(mb_type)) {
742	s->bdsp.clear_blocks(s->block[0]);
743
744	if (!s->chroma_y_shift)
745	s->bdsp.clear_blocks(s->block[6]);
746
747	/* compute DCT type */
748	// FIXME: add an interlaced_dct coded var?
749	if (s->picture_structure == PICT_FRAME &&
750	!s->frame_pred_frame_dct)
751	s->interlaced_dct = get_bits1(&s->gb);
752
753	if (IS_QUANT(mb_type))
754	s->qscale = get_qscale(s);
755
756	if (s->concealment_motion_vectors) {
757	/* just parse them */
758	if (s->picture_structure != PICT_FRAME)
759	skip_bits1(&s->gb); /* field select */
760
761	s->mv[0][0][0] =
762	s->last_mv[0][0][0] =
763	s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
764	s->last_mv[0][0][0]);
765	s->mv[0][0][1] =
766	s->last_mv[0][0][1] =
767	s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
768	s->last_mv[0][0][1]);
769
770	check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
771	} else {
772	/* reset mv prediction */
773	memset(s->last_mv, 0, sizeof(s->last_mv));
774	}
775	s->mb_intra = 1;
776	// if 1, we memcpy blocks in xvmcvideo
777	if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
778	ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
779
780	if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
781	if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
782	for (i = 0; i < 6; i++)
783	mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
784	} else {
785	for (i = 0; i < mb_block_count; i++)
786	if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
787	return ret;
788	}
789	} else {
790	for (i = 0; i < 6; i++) {
791	ret = ff_mpeg1_decode_block_intra(&s->gb,
792	s->intra_matrix,
793	s->intra_scantable.permutated,
794	s->last_dc, *s->pblocks[i],
795	i, s->qscale);
796	if (ret < 0) {
797	av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
798	s->mb_x, s->mb_y);
799	return ret;
800	}
801
802	s->block_last_index[i] = ret;
803	}
804	}
805	} else {
806	if (mb_type & MB_TYPE_ZERO_MV) {
807	av_assert2(mb_type & MB_TYPE_CBP);
808
809	s->mv_dir = MV_DIR_FORWARD;
810	if (s->picture_structure == PICT_FRAME) {
811	if (s->picture_structure == PICT_FRAME
812	&& !s->frame_pred_frame_dct)
813	s->interlaced_dct = get_bits1(&s->gb);
814	s->mv_type = MV_TYPE_16X16;
815	} else {
816	s->mv_type = MV_TYPE_FIELD;
817	mb_type |= MB_TYPE_INTERLACED;
818	s->field_select[0][0] = s->picture_structure - 1;
819	}
820
821	if (IS_QUANT(mb_type))
822	s->qscale = get_qscale(s);
823
824	s->last_mv[0][0][0] = 0;
825	s->last_mv[0][0][1] = 0;
826	s->last_mv[0][1][0] = 0;
827	s->last_mv[0][1][1] = 0;
828	s->mv[0][0][0] = 0;
829	s->mv[0][0][1] = 0;
830	} else {
831	av_assert2(mb_type & MB_TYPE_L0L1);
832	// FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
833	/* get additional motion vector type */
834	if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
835	motion_type = MT_FRAME;
836	} else {
837	motion_type = get_bits(&s->gb, 2);
838	if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
839	s->interlaced_dct = get_bits1(&s->gb);
840	}
841
842	if (IS_QUANT(mb_type))
843	s->qscale = get_qscale(s);
844
845	/* motion vectors */
846	s->mv_dir = (mb_type >> 13) & 3;
847	ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
848	switch (motion_type) {
849	case MT_FRAME: /* or MT_16X8 */
850	if (s->picture_structure == PICT_FRAME) {
851	mb_type |= MB_TYPE_16x16;
852	s->mv_type = MV_TYPE_16X16;
853	for (i = 0; i < 2; i++) {
854	if (USES_LIST(mb_type, i)) {
855	/* MT_FRAME */
856	s->mv[i][0][0] =
857	s->last_mv[i][0][0] =
858	s->last_mv[i][1][0] =
859	mpeg_decode_motion(s, s->mpeg_f_code[i][0],
860	s->last_mv[i][0][0]);
861	s->mv[i][0][1] =
862	s->last_mv[i][0][1] =
863	s->last_mv[i][1][1] =
864	mpeg_decode_motion(s, s->mpeg_f_code[i][1],
865	s->last_mv[i][0][1]);
866	/* full_pel: only for MPEG-1 */
867	if (s->full_pel[i]) {
868	s->mv[i][0][0] *= 2;
869	s->mv[i][0][1] *= 2;
870	}
871	}
872	}
873	} else {
874	mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
875	s->mv_type = MV_TYPE_16X8;
876	for (i = 0; i < 2; i++) {
877	if (USES_LIST(mb_type, i)) {
878	/* MT_16X8 */
879	for (j = 0; j < 2; j++) {
880	s->field_select[i][j] = get_bits1(&s->gb);
881	for (k = 0; k < 2; k++) {
882	val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
883	s->last_mv[i][j][k]);
884	s->last_mv[i][j][k] = val;
885	s->mv[i][j][k] = val;
886	}
887	}
888	}
889	}
890	}
891	break;
892	case MT_FIELD:
893	s->mv_type = MV_TYPE_FIELD;
894	if (s->picture_structure == PICT_FRAME) {
895	mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
896	for (i = 0; i < 2; i++) {
897	if (USES_LIST(mb_type, i)) {
898	for (j = 0; j < 2; j++) {
899	s->field_select[i][j] = get_bits1(&s->gb);
900	val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
901	s->last_mv[i][j][0]);
902	s->last_mv[i][j][0] = val;
903	s->mv[i][j][0] = val;
904	ff_tlog(s->avctx, "fmx=%d\n", val);
905	val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
906	s->last_mv[i][j][1] >> 1);
907	s->last_mv[i][j][1] = 2 * val;
908	s->mv[i][j][1] = val;
909	ff_tlog(s->avctx, "fmy=%d\n", val);
910	}
911	}
912	}
913	} else {
914	av_assert0(!s->progressive_sequence);
915	mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
916	for (i = 0; i < 2; i++) {
917	if (USES_LIST(mb_type, i)) {
918	s->field_select[i][0] = get_bits1(&s->gb);
919	for (k = 0; k < 2; k++) {
920	val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
921	s->last_mv[i][0][k]);
922	s->last_mv[i][0][k] = val;
923	s->last_mv[i][1][k] = val;
924	s->mv[i][0][k] = val;
925	}
926	}
927	}
928	}
929	break;
930	case MT_DMV:
931	if (s->progressive_sequence){
932	av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
933	return AVERROR_INVALIDDATA;
934	}
935	s->mv_type = MV_TYPE_DMV;
936	for (i = 0; i < 2; i++) {
937	if (USES_LIST(mb_type, i)) {
938	int dmx, dmy, mx, my, m;
939	const int my_shift = s->picture_structure == PICT_FRAME;
940
941	mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
942	s->last_mv[i][0][0]);
943	s->last_mv[i][0][0] = mx;
944	s->last_mv[i][1][0] = mx;
945	dmx = get_dmv(s);
946	my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
947	s->last_mv[i][0][1] >> my_shift);
948	dmy = get_dmv(s);
949
950
951	s->last_mv[i][0][1] = my * (1 << my_shift);
952	s->last_mv[i][1][1] = my * (1 << my_shift);
953
954	s->mv[i][0][0] = mx;
955	s->mv[i][0][1] = my;
956	s->mv[i][1][0] = mx; // not used
957	s->mv[i][1][1] = my; // not used
958
959	if (s->picture_structure == PICT_FRAME) {
960	mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
961
962	// m = 1 + 2 * s->top_field_first;
963	m = s->top_field_first ? 1 : 3;
964
965	/* top -> top pred */
966	s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
967	s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
968	m = 4 - m;
969	s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
970	s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
971	} else {
972	mb_type |= MB_TYPE_16x16;
973
974	s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
975	s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
976	if (s->picture_structure == PICT_TOP_FIELD)
977	s->mv[i][2][1]--;
978	else
979	s->mv[i][2][1]++;
980	}
981	}
982	}
983	break;
984	default:
985	av_log(s->avctx, AV_LOG_ERROR,
986	"00 motion_type at %d %d\n", s->mb_x, s->mb_y);
987	return AVERROR_INVALIDDATA;
988	}
989	}
990
991	s->mb_intra = 0;
992	if (HAS_CBP(mb_type)) {
993	s->bdsp.clear_blocks(s->block[0]);
994
995	cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
996	if (mb_block_count > 6) {
997	cbp *= 1 << mb_block_count - 6;
998	cbp |= get_bits(&s->gb, mb_block_count - 6);
999	s->bdsp.clear_blocks(s->block[6]);
1000	}
1001	if (cbp <= 0) {
1002	av_log(s->avctx, AV_LOG_ERROR,
1003	"invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1004	return AVERROR_INVALIDDATA;
1005	}
1006
1007	// if 1, we memcpy blocks in xvmcvideo
1008	if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1009	ff_xvmc_pack_pblocks(s, cbp);
1010
1011	if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1012	if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1013	for (i = 0; i < 6; i++) {
1014	if (cbp & 32)
1015	mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1016	else
1017	s->block_last_index[i] = -1;
1018	cbp += cbp;
1019	}
1020	} else {
1021	cbp <<= 12 - mb_block_count;
1022
1023	for (i = 0; i < mb_block_count; i++) {
1024	if (cbp & (1 << 11)) {
1025	if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1026	return ret;
1027	} else {
1028	s->block_last_index[i] = -1;
1029	}
1030	cbp += cbp;
1031	}
1032	}
1033	} else {
1034	if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1035	for (i = 0; i < 6; i++) {
1036	if (cbp & 32)
1037	mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1038	else
1039	s->block_last_index[i] = -1;
1040	cbp += cbp;
1041	}
1042	} else {
1043	for (i = 0; i < 6; i++) {
1044	if (cbp & 32) {
1045	if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1046	return ret;
1047	} else {
1048	s->block_last_index[i] = -1;
1049	}
1050	cbp += cbp;
1051	}
1052	}
1053	}
1054	} else {
1055	for (i = 0; i < 12; i++)
1056	s->block_last_index[i] = -1;
1057	}
1058	}
1059
1060	s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1061
1062	return 0;
1063	}
1064
1065	static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1066	{
1067	Mpeg1Context *s = avctx->priv_data;
1068	MpegEncContext *s2 = &s->mpeg_enc_ctx;
1069
1070	ff_mpv_decode_defaults(s2);
1071
1072	if ( avctx->codec_tag != AV_RL32("VCR2")
1073	&& avctx->codec_tag != AV_RL32("BW10"))
1074	avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1075	ff_mpv_decode_init(s2, avctx);
1076
1077	s->mpeg_enc_ctx.avctx = avctx;
1078
1079	/* we need some permutation to store matrices,
1080	* until the decoder sets the real permutation. */
1081	ff_mpv_idct_init(s2);
1082	ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1083	ff_mpeg12_init_vlcs();
1084
1085	s2->chroma_format = 1;
1086	s->mpeg_enc_ctx_allocated = 0;
1087	s->mpeg_enc_ctx.picture_number = 0;
1088	s->repeat_field = 0;
1089	s->mpeg_enc_ctx.codec_id = avctx->codec->id;
1090	avctx->color_range = AVCOL_RANGE_MPEG;
1091	return 0;
1092	}
1093
1094	#if HAVE_THREADS
1095	static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1096	const AVCodecContext *avctx_from)
1097	{
1098	Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1099	MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1100	int err;
1101
1102	if (avctx == avctx_from ||
1103	!ctx_from->mpeg_enc_ctx_allocated ||
1104	!s1->context_initialized)
1105	return 0;
1106
1107	err = ff_mpeg_update_thread_context(avctx, avctx_from);
1108	if (err)
1109	return err;
1110
1111	if (!ctx->mpeg_enc_ctx_allocated)
1112	memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1113
1114	if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1115	s->picture_number++;
1116
1117	return 0;
1118	}
1119	#endif
1120
1121	static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1122	const uint8_t *new_perm)
1123	{
1124	uint16_t temp_matrix[64];
1125	int i;
1126
1127	memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1128
1129	for (i = 0; i < 64; i++)
1130	matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1131	}
1132
1133	static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1134	#if CONFIG_MPEG1_XVMC_HWACCEL
1135	AV_PIX_FMT_XVMC,
1136	#endif
1137	#if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
1138	AV_PIX_FMT_VDPAU_MPEG1,
1139	#endif
1140	#if CONFIG_MPEG1_VDPAU_HWACCEL
1141	AV_PIX_FMT_VDPAU,
1142	#endif
1143	AV_PIX_FMT_YUV420P,
1144	AV_PIX_FMT_NONE
1145	};
1146
1147	static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1148	#if CONFIG_MPEG2_XVMC_HWACCEL
1149	AV_PIX_FMT_XVMC,
1150	#endif
1151	#if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
1152	AV_PIX_FMT_VDPAU_MPEG2,
1153	#endif
1154	#if CONFIG_MPEG2_VDPAU_HWACCEL
1155	AV_PIX_FMT_VDPAU,
1156	#endif
1157	#if CONFIG_MPEG2_DXVA2_HWACCEL
1158	AV_PIX_FMT_DXVA2_VLD,
1159	#endif
1160	#if CONFIG_MPEG2_D3D11VA_HWACCEL
1161	AV_PIX_FMT_D3D11VA_VLD,
1162	#endif
1163	#if CONFIG_MPEG2_VAAPI_HWACCEL
1164	AV_PIX_FMT_VAAPI,
1165	#endif
1166	#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1167	AV_PIX_FMT_VIDEOTOOLBOX,
1168	#endif
1169	AV_PIX_FMT_YUV420P,
1170	AV_PIX_FMT_NONE
1171	};
1172
1173	static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1174	AV_PIX_FMT_YUV422P,
1175	AV_PIX_FMT_NONE
1176	};
1177
1178	static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1179	AV_PIX_FMT_YUV444P,
1180	AV_PIX_FMT_NONE
1181	};
1182
1183	#if FF_API_VDPAU
1184	static inline int uses_vdpau(AVCodecContext *avctx) {
1185	return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
1186	}
1187	#endif
1188
1189	static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1190	{
1191	Mpeg1Context *s1 = avctx->priv_data;
1192	MpegEncContext *s = &s1->mpeg_enc_ctx;
1193	const enum AVPixelFormat *pix_fmts;
1194
1195	if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1196	return AV_PIX_FMT_GRAY8;
1197
1198	if (s->chroma_format < 2)
1199	pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1200	mpeg1_hwaccel_pixfmt_list_420 :
1201	mpeg2_hwaccel_pixfmt_list_420;
1202	else if (s->chroma_format == 2)
1203	pix_fmts = mpeg12_pixfmt_list_422;
1204	else
1205	pix_fmts = mpeg12_pixfmt_list_444;
1206
1207	return ff_thread_get_format(avctx, pix_fmts);
1208	}
1209
1210	static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1211	{
1212	// until then pix_fmt may be changed right after codec init
1213	if (avctx->hwaccel
1214	#if FF_API_VDPAU
1215	|| uses_vdpau(avctx)
1216	#endif
1217	)
1218	if (avctx->idct_algo == FF_IDCT_AUTO)
1219	avctx->idct_algo = FF_IDCT_SIMPLE;
1220
1221	if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1222	Mpeg1Context *s1 = avctx->priv_data;
1223	MpegEncContext *s = &s1->mpeg_enc_ctx;
1224
1225	s->pack_pblocks = 1;
1226	#if FF_API_XVMC
1227	FF_DISABLE_DEPRECATION_WARNINGS
1228	avctx->xvmc_acceleration = 2;
1229	FF_ENABLE_DEPRECATION_WARNINGS
1230	#endif /* FF_API_XVMC */
1231	}
1232	}
1233
1234	/* Call this function when we know all parameters.
1235	* It may be called in different places for MPEG-1 and MPEG-2. */
1236	static int mpeg_decode_postinit(AVCodecContext *avctx)
1237	{
1238	Mpeg1Context *s1 = avctx->priv_data;
1239	MpegEncContext *s = &s1->mpeg_enc_ctx;
1240	uint8_t old_permutation[64];
1241	int ret;
1242
1243	if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1244	// MPEG-1 aspect
1245	avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1246	} else { // MPEG-2
1247	// MPEG-2 aspect
1248	if (s->aspect_ratio_info > 1) {
1249	AVRational dar =
1250	av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1251	(AVRational) { s1->pan_scan.width,
1252	s1->pan_scan.height }),
1253	(AVRational) { s->width, s->height });
1254
1255	/* We ignore the spec here and guess a bit as reality does not
1256	* match the spec, see for example res_change_ffmpeg_aspect.ts
1257	* and sequence-display-aspect.mpg.
1258	* issue1613, 621, 562 */
1259	if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1260	(av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1261	av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1262	s->avctx->sample_aspect_ratio =
1263	av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1264	(AVRational) { s->width, s->height });
1265	} else {
1266	s->avctx->sample_aspect_ratio =
1267	av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1268	(AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1269	// issue1613 4/3 16/9 -> 16/9
1270	// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1271	// widescreen-issue562.mpg 4/3 16/9 -> 16/9
1272	// s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1273	ff_dlog(avctx, "aspect A %d/%d\n",
1274	ff_mpeg2_aspect[s->aspect_ratio_info].num,
1275	ff_mpeg2_aspect[s->aspect_ratio_info].den);
1276	ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1277	s->avctx->sample_aspect_ratio.den);
1278	}
1279	} else {
1280	s->avctx->sample_aspect_ratio =
1281	ff_mpeg2_aspect[s->aspect_ratio_info];
1282	}
1283	} // MPEG-2
1284
1285	if (av_image_check_sar(s->width, s->height,
1286	avctx->sample_aspect_ratio) < 0) {
1287	av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1288	avctx->sample_aspect_ratio.num,
1289	avctx->sample_aspect_ratio.den);
1290	avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1291	}
1292
1293	if ((s1->mpeg_enc_ctx_allocated == 0) ||
1294	avctx->coded_width != s->width ||
1295	avctx->coded_height != s->height ||
1296	s1->save_width != s->width ||
1297	s1->save_height != s->height ||
1298	av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1299	(s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1300	0) {
1301	if (s1->mpeg_enc_ctx_allocated) {
1302	ParseContext pc = s->parse_context;
1303	s->parse_context.buffer = 0;
1304	ff_mpv_common_end(s);
1305	s->parse_context = pc;
1306	s1->mpeg_enc_ctx_allocated = 0;
1307	}
1308
1309	ret = ff_set_dimensions(avctx, s->width, s->height);
1310	if (ret < 0)
1311	return ret;
1312
1313	if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1314	avctx->rc_max_rate = s->bit_rate;
1315	} else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1316	(s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1317	avctx->bit_rate = s->bit_rate;
1318	}
1319	s1->save_aspect = s->avctx->sample_aspect_ratio;
1320	s1->save_width = s->width;
1321	s1->save_height = s->height;
1322	s1->save_progressive_seq = s->progressive_sequence;
1323
1324	/* low_delay may be forced, in this case we will have B-frames
1325	* that behave like P-frames. */
1326	avctx->has_b_frames = !s->low_delay;
1327
1328	if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1329	// MPEG-1 fps
1330	avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1331	avctx->ticks_per_frame = 1;
1332
1333	avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1334	} else { // MPEG-2
1335	// MPEG-2 fps
1336	av_reduce(&s->avctx->framerate.num,
1337	&s->avctx->framerate.den,
1338	ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1339	ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1340	1 << 30);
1341	avctx->ticks_per_frame = 2;
1342
1343	switch (s->chroma_format) {
1344	case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1345	case 2:
1346	case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1347	default: av_assert0(0);
1348	}
1349	} // MPEG-2
1350
1351	avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1352	setup_hwaccel_for_pixfmt(avctx);
1353
1354	/* Quantization matrices may need reordering
1355	* if DCT permutation is changed. */
1356	memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1357
1358	ff_mpv_idct_init(s);
1359	if ((ret = ff_mpv_common_init(s)) < 0)
1360	return ret;
1361
1362	quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
1363	quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
1364	quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1365	quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1366
1367	s1->mpeg_enc_ctx_allocated = 1;
1368	}
1369	return 0;
1370	}
1371
1372	static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1373	int buf_size)
1374	{
1375	Mpeg1Context *s1 = avctx->priv_data;
1376	MpegEncContext *s = &s1->mpeg_enc_ctx;
1377	int ref, f_code, vbv_delay;
1378
1379	init_get_bits(&s->gb, buf, buf_size * 8);
1380
1381	ref = get_bits(&s->gb, 10); /* temporal ref */
1382	s->pict_type = get_bits(&s->gb, 3);
1383	if (s->pict_type == 0 || s->pict_type > 3)
1384	return AVERROR_INVALIDDATA;
1385
1386	vbv_delay = get_bits(&s->gb, 16);
1387	s->vbv_delay = vbv_delay;
1388	if (s->pict_type == AV_PICTURE_TYPE_P ||
1389	s->pict_type == AV_PICTURE_TYPE_B) {
1390	s->full_pel[0] = get_bits1(&s->gb);
1391	f_code = get_bits(&s->gb, 3);
1392	if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1393	return AVERROR_INVALIDDATA;
1394	f_code += !f_code;
1395	s->mpeg_f_code[0][0] = f_code;
1396	s->mpeg_f_code[0][1] = f_code;
1397	}
1398	if (s->pict_type == AV_PICTURE_TYPE_B) {
1399	s->full_pel[1] = get_bits1(&s->gb);
1400	f_code = get_bits(&s->gb, 3);
1401	if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1402	return AVERROR_INVALIDDATA;
1403	f_code += !f_code;
1404	s->mpeg_f_code[1][0] = f_code;
1405	s->mpeg_f_code[1][1] = f_code;
1406	}
1407	s->current_picture.f->pict_type = s->pict_type;
1408	s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1409
1410	if (avctx->debug & FF_DEBUG_PICT_INFO)
1411	av_log(avctx, AV_LOG_DEBUG,
1412	"vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1413
1414	s->y_dc_scale = 8;
1415	s->c_dc_scale = 8;
1416	return 0;
1417	}
1418
1419	static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1420	{
1421	MpegEncContext *s = &s1->mpeg_enc_ctx;
1422	int horiz_size_ext, vert_size_ext;
1423	int bit_rate_ext;
1424
1425	skip_bits(&s->gb, 1); /* profile and level esc*/
1426	s->avctx->profile = get_bits(&s->gb, 3);
1427	s->avctx->level = get_bits(&s->gb, 4);
1428	s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1429	s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1430
1431	if (!s->chroma_format) {
1432	s->chroma_format = 1;
1433	av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1434	}
1435
1436	horiz_size_ext = get_bits(&s->gb, 2);
1437	vert_size_ext = get_bits(&s->gb, 2);
1438	s->width |= (horiz_size_ext << 12);
1439	s->height |= (vert_size_ext << 12);
1440	bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1441	s->bit_rate += (bit_rate_ext << 18) * 400LL;
1442	check_marker(s->avctx, &s->gb, "after bit rate extension");
1443	s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1444
1445	s->low_delay = get_bits1(&s->gb);
1446	if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1447	s->low_delay = 1;
1448
1449	s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1450	s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1451
1452	ff_dlog(s->avctx, "sequence extension\n");
1453	s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1454
1455	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1456	av_log(s->avctx, AV_LOG_DEBUG,
1457	"profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1458	s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1459	s->avctx->rc_buffer_size, s->bit_rate);
1460	}
1461
1462	static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1463	{
1464	MpegEncContext *s = &s1->mpeg_enc_ctx;
1465	int color_description, w, h;
1466
1467	skip_bits(&s->gb, 3); /* video format */
1468	color_description = get_bits1(&s->gb);
1469	if (color_description) {
1470	s->avctx->color_primaries = get_bits(&s->gb, 8);
1471	s->avctx->color_trc = get_bits(&s->gb, 8);
1472	s->avctx->colorspace = get_bits(&s->gb, 8);
1473	}
1474	w = get_bits(&s->gb, 14);
1475	skip_bits(&s->gb, 1); // marker
1476	h = get_bits(&s->gb, 14);
1477	// remaining 3 bits are zero padding
1478
1479	s1->pan_scan.width = 16 * w;
1480	s1->pan_scan.height = 16 * h;
1481
1482	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1483	av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1484	}
1485
1486	static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1487	{
1488	MpegEncContext *s = &s1->mpeg_enc_ctx;
1489	int i, nofco;
1490
1491	nofco = 1;
1492	if (s->progressive_sequence) {
1493	if (s->repeat_first_field) {
1494	nofco++;
1495	if (s->top_field_first)
1496	nofco++;
1497	}
1498	} else {
1499	if (s->picture_structure == PICT_FRAME) {
1500	nofco++;
1501	if (s->repeat_first_field)
1502	nofco++;
1503	}
1504	}
1505	for (i = 0; i < nofco; i++) {
1506	s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1507	skip_bits(&s->gb, 1); // marker
1508	s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1509	skip_bits(&s->gb, 1); // marker
1510	}
1511
1512	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1513	av_log(s->avctx, AV_LOG_DEBUG,
1514	"pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1515	s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1516	s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1517	s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1518	}
1519
1520	static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1521	uint16_t matrix1[64], int intra)
1522	{
1523	int i;
1524
1525	for (i = 0; i < 64; i++) {
1526	int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1527	int v = get_bits(&s->gb, 8);
1528	if (v == 0) {
1529	av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1530	return AVERROR_INVALIDDATA;
1531	}
1532	if (intra && i == 0 && v != 8) {
1533	av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1534	v = 8; // needed by pink.mpg / issue1046
1535	}
1536	matrix0[j] = v;
1537	if (matrix1)
1538	matrix1[j] = v;
1539	}
1540	return 0;
1541	}
1542
1543	static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1544	{
1545	ff_dlog(s->avctx, "matrix extension\n");
1546
1547	if (get_bits1(&s->gb))
1548	load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1549	if (get_bits1(&s->gb))
1550	load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1551	if (get_bits1(&s->gb))
1552	load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1553	if (get_bits1(&s->gb))
1554	load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1555	}
1556
1557	static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1558	{
1559	MpegEncContext *s = &s1->mpeg_enc_ctx;
1560
1561	s->full_pel[0] = s->full_pel[1] = 0;
1562	s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1563	s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1564	s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1565	s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1566	if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1567	av_log(s->avctx, AV_LOG_ERROR,
1568	"Missing picture start code, guessing missing values\n");
1569	if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1570	if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1571	s->pict_type = AV_PICTURE_TYPE_I;
1572	else
1573	s->pict_type = AV_PICTURE_TYPE_P;
1574	} else
1575	s->pict_type = AV_PICTURE_TYPE_B;
1576	s->current_picture.f->pict_type = s->pict_type;
1577	s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1578	}
1579	s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1580	s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1581	s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1582	s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1583
1584	s->intra_dc_precision = get_bits(&s->gb, 2);
1585	s->picture_structure = get_bits(&s->gb, 2);
1586	s->top_field_first = get_bits1(&s->gb);
1587	s->frame_pred_frame_dct = get_bits1(&s->gb);
1588	s->concealment_motion_vectors = get_bits1(&s->gb);
1589	s->q_scale_type = get_bits1(&s->gb);
1590	s->intra_vlc_format = get_bits1(&s->gb);
1591	s->alternate_scan = get_bits1(&s->gb);
1592	s->repeat_first_field = get_bits1(&s->gb);
1593	s->chroma_420_type = get_bits1(&s->gb);
1594	s->progressive_frame = get_bits1(&s->gb);
1595
1596	if (s->alternate_scan) {
1597	ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1598	ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1599	} else {
1600	ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1601	ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1602	}
1603
1604	/* composite display not parsed */
1605	ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1606	ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1607	ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1608	ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1609	ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1610	ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1611	ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1612	ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1613	ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1614	}
1615
1616	static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1617	{
1618	AVCodecContext *avctx = s->avctx;
1619	Mpeg1Context *s1 = (Mpeg1Context *) s;
1620	int ret;
1621
1622	/* start frame decoding */
1623	if (s->first_field || s->picture_structure == PICT_FRAME) {
1624	AVFrameSideData *pan_scan;
1625
1626	if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1627	return ret;
1628
1629	ff_mpeg_er_frame_start(s);
1630
1631	/* first check if we must repeat the frame */
1632	s->current_picture_ptr->f->repeat_pict = 0;
1633	if (s->repeat_first_field) {
1634	if (s->progressive_sequence) {
1635	if (s->top_field_first)
1636	s->current_picture_ptr->f->repeat_pict = 4;
1637	else
1638	s->current_picture_ptr->f->repeat_pict = 2;
1639	} else if (s->progressive_frame) {
1640	s->current_picture_ptr->f->repeat_pict = 1;
1641	}
1642	}
1643
1644	pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1645	AV_FRAME_DATA_PANSCAN,
1646	sizeof(s1->pan_scan));
1647	if (!pan_scan)
1648	return AVERROR(ENOMEM);
1649	memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1650
1651	if (s1->a53_caption) {
1652	AVFrameSideData *sd = av_frame_new_side_data(
1653	s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1654	s1->a53_caption_size);
1655	if (sd)
1656	memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1657	av_freep(&s1->a53_caption);
1658	}
1659
1660	if (s1->has_stereo3d) {
1661	AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1662	if (!stereo)
1663	return AVERROR(ENOMEM);
1664
1665	*stereo = s1->stereo3d;
1666	s1->has_stereo3d = 0;
1667	}
1668
1669	if (s1->has_afd) {
1670	AVFrameSideData *sd =
1671	av_frame_new_side_data(s->current_picture_ptr->f,
1672	AV_FRAME_DATA_AFD, 1);
1673	if (!sd)
1674	return AVERROR(ENOMEM);
1675
1676	*sd->data = s1->afd;
1677	s1->has_afd = 0;
1678	}
1679
1680	if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1681	ff_thread_finish_setup(avctx);
1682	} else { // second field
1683	int i;
1684
1685	if (!s->current_picture_ptr) {
1686	av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1687	return AVERROR_INVALIDDATA;
1688	}
1689
1690	if (s->avctx->hwaccel &&
1691	(s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1692	if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1693	av_log(avctx, AV_LOG_ERROR,
1694	"hardware accelerator failed to decode first field\n");
1695	return ret;
1696	}
1697	}
1698
1699	for (i = 0; i < 4; i++) {
1700	s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1701	if (s->picture_structure == PICT_BOTTOM_FIELD)
1702	s->current_picture.f->data[i] +=
1703	s->current_picture_ptr->f->linesize[i];
1704	}
1705	}
1706
1707	if (avctx->hwaccel) {
1708	if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1709	return ret;
1710	}
1711
1712	return 0;
1713	}
1714
1715	#define DECODE_SLICE_ERROR -1
1716	#define DECODE_SLICE_OK 0
1717
1718	/**
1719	* Decode a slice.
1720	* MpegEncContext.mb_y must be set to the MB row from the startcode.
1721	* @return DECODE_SLICE_ERROR if the slice is damaged,
1722	* DECODE_SLICE_OK if this slice is OK
1723	*/
1724	static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1725	const uint8_t **buf, int buf_size)
1726	{
1727	AVCodecContext *avctx = s->avctx;
1728	const int lowres = s->avctx->lowres;
1729	const int field_pic = s->picture_structure != PICT_FRAME;
1730	int ret;
1731
1732	s->resync_mb_x =
1733	s->resync_mb_y = -1;
1734
1735	av_assert0(mb_y < s->mb_height);
1736
1737	init_get_bits(&s->gb, *buf, buf_size * 8);
1738	if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1739	skip_bits(&s->gb, 3);
1740
1741	ff_mpeg1_clean_buffers(s);
1742	s->interlaced_dct = 0;
1743
1744	s->qscale = get_qscale(s);
1745
1746	if (s->qscale == 0) {
1747	av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1748	return AVERROR_INVALIDDATA;
1749	}
1750
1751	/* extra slice info */
1752	if (skip_1stop_8data_bits(&s->gb) < 0)
1753	return AVERROR_INVALIDDATA;
1754
1755	s->mb_x = 0;
1756
1757	if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1758	skip_bits1(&s->gb);
1759	} else {
1760	while (get_bits_left(&s->gb) > 0) {
1761	int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1762	MBINCR_VLC_BITS, 2);
1763	if (code < 0) {
1764	av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1765	return AVERROR_INVALIDDATA;
1766	}
1767	if (code >= 33) {
1768	if (code == 33)
1769	s->mb_x += 33;
1770	/* otherwise, stuffing, nothing to do */
1771	} else {
1772	s->mb_x += code;
1773	break;
1774	}
1775	}
1776	}
1777
1778	if (s->mb_x >= (unsigned) s->mb_width) {
1779	av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1780	return AVERROR_INVALIDDATA;
1781	}
1782
1783	if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1784	const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1785	int start_code = -1;
1786	buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1787	if (buf_end < *buf + buf_size)
1788	buf_end -= 4;
1789	s->mb_y = mb_y;
1790	if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1791	return DECODE_SLICE_ERROR;
1792	*buf = buf_end;
1793	return DECODE_SLICE_OK;
1794	}
1795
1796	s->resync_mb_x = s->mb_x;
1797	s->resync_mb_y = s->mb_y = mb_y;
1798	s->mb_skip_run = 0;
1799	ff_init_block_index(s);
1800
1801	if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1802	if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1803	av_log(s->avctx, AV_LOG_DEBUG,
1804	"qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1805	s->qscale,
1806	s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1807	s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1808	s->pict_type == AV_PICTURE_TYPE_I ? "I" :
1809	(s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1810	(s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1811	s->progressive_sequence ? "ps" : "",
1812	s->progressive_frame ? "pf" : "",
1813	s->alternate_scan ? "alt" : "",
1814	s->top_field_first ? "top" : "",
1815	s->intra_dc_precision, s->picture_structure,
1816	s->frame_pred_frame_dct, s->concealment_motion_vectors,
1817	s->q_scale_type, s->intra_vlc_format,
1818	s->repeat_first_field, s->chroma_420_type ? "420" : "");
1819	}
1820	}
1821
1822	for (;;) {
1823	// If 1, we memcpy blocks in xvmcvideo.
1824	if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1825	ff_xvmc_init_block(s); // set s->block
1826
1827	if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1828	return ret;
1829
1830	// Note motion_val is normally NULL unless we want to extract the MVs.
1831	if (s->current_picture.motion_val[0] && !s->encoding) {
1832	const int wrap = s->b8_stride;
1833	int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
1834	int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1835	int motion_x, motion_y, dir, i;
1836
1837	for (i = 0; i < 2; i++) {
1838	for (dir = 0; dir < 2; dir++) {
1839	if (s->mb_intra ||
1840	(dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1841	motion_x = motion_y = 0;
1842	} else if (s->mv_type == MV_TYPE_16X16 ||
1843	(s->mv_type == MV_TYPE_FIELD && field_pic)) {
1844	motion_x = s->mv[dir][0][0];
1845	motion_y = s->mv[dir][0][1];
1846	} else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1847	motion_x = s->mv[dir][i][0];
1848	motion_y = s->mv[dir][i][1];
1849	}
1850
1851	s->current_picture.motion_val[dir][xy][0] = motion_x;
1852	s->current_picture.motion_val[dir][xy][1] = motion_y;
1853	s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1854	s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1855	s->current_picture.ref_index [dir][b8_xy] =
1856	s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1857	av_assert2(s->field_select[dir][i] == 0 ||
1858	s->field_select[dir][i] == 1);
1859	}
1860	xy += wrap;
1861	b8_xy += 2;
1862	}
1863	}
1864
1865	s->dest[0] += 16 >> lowres;
1866	s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1867	s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1868
1869	ff_mpv_decode_mb(s, s->block);
1870
1871	if (++s->mb_x >= s->mb_width) {
1872	const int mb_size = 16 >> s->avctx->lowres;
1873	int left;
1874
1875	ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1876	ff_mpv_report_decode_progress(s);
1877
1878	s->mb_x = 0;
1879	s->mb_y += 1 << field_pic;
1880
1881	if (s->mb_y >= s->mb_height) {
1882	int left = get_bits_left(&s->gb);
1883	int is_d10 = s->chroma_format == 2 &&
1884	s->pict_type == AV_PICTURE_TYPE_I &&
1885	avctx->profile == 0 && avctx->level == 5 &&
1886	s->intra_dc_precision == 2 &&
1887	s->q_scale_type == 1 && s->alternate_scan == 0 &&
1888	s->progressive_frame == 0
1889	/* vbv_delay == 0xBBB || 0xE10 */;
1890
1891	if (left >= 32 && !is_d10) {
1892	GetBitContext gb = s->gb;
1893	align_get_bits(&gb);
1894	if (show_bits(&gb, 24) == 0x060E2B) {
1895	av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1896	is_d10 = 1;
1897	}
1898	if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1899	av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1900	goto eos;
1901	}
1902	}
1903
1904	if (left < 0 ||
1905	(left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1906	((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1907	av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1908	left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1909	return AVERROR_INVALIDDATA;
1910	} else
1911	goto eos;
1912	}
1913	// There are some files out there which are missing the last slice
1914	// in cases where the slice is completely outside the visible
1915	// area, we detect this here instead of running into the end expecting
1916	// more data
1917	left = get_bits_left(&s->gb);
1918	if (s->mb_y >= ((s->height + 15) >> 4) &&
1919	!s->progressive_sequence &&
1920	left <= 25 &&
1921	left >= 0 &&
1922	s->mb_skip_run == -1 &&
1923	(!left || show_bits(&s->gb, left) == 0))
1924	goto eos;
1925
1926	ff_init_block_index(s);
1927	}
1928
1929	/* skip mb handling */
1930	if (s->mb_skip_run == -1) {
1931	/* read increment again */
1932	s->mb_skip_run = 0;
1933	for (;;) {
1934	int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1935	MBINCR_VLC_BITS, 2);
1936	if (code < 0) {
1937	av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1938	return AVERROR_INVALIDDATA;
1939	}
1940	if (code >= 33) {
1941	if (code == 33) {
1942	s->mb_skip_run += 33;
1943	} else if (code == 35) {
1944	if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1945	av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1946	return AVERROR_INVALIDDATA;
1947	}
1948	goto eos; /* end of slice */
1949	}
1950	/* otherwise, stuffing, nothing to do */
1951	} else {
1952	s->mb_skip_run += code;
1953	break;
1954	}
1955	}
1956	if (s->mb_skip_run) {
1957	int i;
1958	if (s->pict_type == AV_PICTURE_TYPE_I) {
1959	av_log(s->avctx, AV_LOG_ERROR,
1960	"skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1961	return AVERROR_INVALIDDATA;
1962	}
1963
1964	/* skip mb */
1965	s->mb_intra = 0;
1966	for (i = 0; i < 12; i++)
1967	s->block_last_index[i] = -1;
1968	if (s->picture_structure == PICT_FRAME)
1969	s->mv_type = MV_TYPE_16X16;
1970	else
1971	s->mv_type = MV_TYPE_FIELD;
1972	if (s->pict_type == AV_PICTURE_TYPE_P) {
1973	/* if P type, zero motion vector is implied */
1974	s->mv_dir = MV_DIR_FORWARD;
1975	s->mv[0][0][0] = s->mv[0][0][1] = 0;
1976	s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1977	s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1978	s->field_select[0][0] = (s->picture_structure - 1) & 1;
1979	} else {
1980	/* if B type, reuse previous vectors and directions */
1981	s->mv[0][0][0] = s->last_mv[0][0][0];
1982	s->mv[0][0][1] = s->last_mv[0][0][1];
1983	s->mv[1][0][0] = s->last_mv[1][0][0];
1984	s->mv[1][0][1] = s->last_mv[1][0][1];
1985	}
1986	}
1987	}
1988	}
1989	eos: // end of slice
1990	if (get_bits_left(&s->gb) < 0) {
1991	av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1992	return AVERROR_INVALIDDATA;
1993	}
1994	*buf += (get_bits_count(&s->gb) - 1) / 8;
1995	ff_dlog(s, "Slice start:%d %d end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1996	return 0;
1997	}
1998
1999	static int slice_decode_thread(AVCodecContext *c, void *arg)
2000	{
2001	MpegEncContext *s = *(void **) arg;
2002	const uint8_t *buf = s->gb.buffer;
2003	int mb_y = s->start_mb_y;
2004	const int field_pic = s->picture_structure != PICT_FRAME;
2005
2006	s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
2007
2008	for (;;) {
2009	uint32_t start_code;
2010	int ret;
2011
2012	ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2013	emms_c();
2014	ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2015	ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2016	s->start_mb_y, s->end_mb_y, s->er.error_count);
2017	if (ret < 0) {
2018	if (c->err_recognition & AV_EF_EXPLODE)
2019	return ret;
2020	if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2021	ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2022	s->mb_x, s->mb_y,
2023	ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2024	} else {
2025	ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2026	s->mb_x - 1, s->mb_y,
2027	ER_AC_END | ER_DC_END | ER_MV_END);
2028	}
2029
2030	if (s->mb_y == s->end_mb_y)
2031	return 0;
2032
2033	start_code = -1;
2034	buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2035	mb_y = start_code - SLICE_MIN_START_CODE;
2036	if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2037	mb_y += (*buf&0xE0)<<2;
2038	mb_y <<= field_pic;
2039	if (s->picture_structure == PICT_BOTTOM_FIELD)
2040	mb_y++;
2041	if (mb_y < 0 || mb_y >= s->end_mb_y)
2042	return AVERROR_INVALIDDATA;
2043	}
2044	}
2045
2046	/**
2047	* Handle slice ends.
2048	* @return 1 if it seems to be the last slice
2049	*/
2050	static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2051	{
2052	Mpeg1Context *s1 = avctx->priv_data;
2053	MpegEncContext *s = &s1->mpeg_enc_ctx;
2054
2055	if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2056	return 0;
2057
2058	if (s->avctx->hwaccel) {
2059	int ret = s->avctx->hwaccel->end_frame(s->avctx);
2060	if (ret < 0) {
2061	av_log(avctx, AV_LOG_ERROR,
2062	"hardware accelerator failed to decode picture\n");
2063	return ret;
2064	}
2065	}
2066
2067	/* end of slice reached */
2068	if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2069	/* end of image */
2070
2071	ff_er_frame_end(&s->er);
2072
2073	ff_mpv_frame_end(s);
2074
2075	if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2076	int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2077	if (ret < 0)
2078	return ret;
2079	ff_print_debug_info(s, s->current_picture_ptr, pict);
2080	ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2081	} else {
2082	if (avctx->active_thread_type & FF_THREAD_FRAME)
2083	s->picture_number++;
2084	/* latency of 1 frame for I- and P-frames */
2085	/* XXX: use another variable than picture_number */
2086	if (s->last_picture_ptr) {
2087	int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2088	if (ret < 0)
2089	return ret;
2090	ff_print_debug_info(s, s->last_picture_ptr, pict);
2091	ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2092	}
2093	}
2094
2095	return 1;
2096	} else {
2097	return 0;
2098	}
2099	}
2100
2101	static int mpeg1_decode_sequence(AVCodecContext *avctx,
2102	const uint8_t *buf, int buf_size)
2103	{
2104	Mpeg1Context *s1 = avctx->priv_data;
2105	MpegEncContext *s = &s1->mpeg_enc_ctx;
2106	int width, height;
2107	int i, v, j;
2108
2109	init_get_bits(&s->gb, buf, buf_size * 8);
2110
2111	width = get_bits(&s->gb, 12);
2112	height = get_bits(&s->gb, 12);
2113	if (width == 0 || height == 0) {
2114	av_log(avctx, AV_LOG_WARNING,
2115	"Invalid horizontal or vertical size value.\n");
2116	if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2117	return AVERROR_INVALIDDATA;
2118	}
2119	s->aspect_ratio_info = get_bits(&s->gb, 4);
2120	if (s->aspect_ratio_info == 0) {
2121	av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2122	if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2123	return AVERROR_INVALIDDATA;
2124	}
2125	s->frame_rate_index = get_bits(&s->gb, 4);
2126	if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2127	av_log(avctx, AV_LOG_WARNING,
2128	"frame_rate_index %d is invalid\n", s->frame_rate_index);
2129	s->frame_rate_index = 1;
2130	}
2131	s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2132	if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2133	return AVERROR_INVALIDDATA;
2134	}
2135
2136	s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2137	skip_bits(&s->gb, 1);
2138
2139	/* get matrix */
2140	if (get_bits1(&s->gb)) {
2141	load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2142	} else {
2143	for (i = 0; i < 64; i++) {
2144	j = s->idsp.idct_permutation[i];
2145	v = ff_mpeg1_default_intra_matrix[i];
2146	s->intra_matrix[j] = v;
2147	s->chroma_intra_matrix[j] = v;
2148	}
2149	}
2150	if (get_bits1(&s->gb)) {
2151	load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2152	} else {
2153	for (i = 0; i < 64; i++) {
2154	int j = s->idsp.idct_permutation[i];
2155	v = ff_mpeg1_default_non_intra_matrix[i];
2156	s->inter_matrix[j] = v;
2157	s->chroma_inter_matrix[j] = v;
2158	}
2159	}
2160
2161	if (show_bits(&s->gb, 23) != 0) {
2162	av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2163	return AVERROR_INVALIDDATA;
2164	}
2165
2166	s->width = width;
2167	s->height = height;
2168
2169	/* We set MPEG-2 parameters so that it emulates MPEG-1. */
2170	s->progressive_sequence = 1;
2171	s->progressive_frame = 1;
2172	s->picture_structure = PICT_FRAME;
2173	s->first_field = 0;
2174	s->frame_pred_frame_dct = 1;
2175	s->chroma_format = 1;
2176	s->codec_id =
2177	s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2178	s->out_format = FMT_MPEG1;
2179	s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
2180	if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2181	s->low_delay = 1;
2182
2183	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2184	av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2185	s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2186
2187	return 0;
2188	}
2189
2190	static int vcr2_init_sequence(AVCodecContext *avctx)
2191	{
2192	Mpeg1Context *s1 = avctx->priv_data;
2193	MpegEncContext *s = &s1->mpeg_enc_ctx;
2194	int i, v, ret;
2195
2196	/* start new MPEG-1 context decoding */
2197	s->out_format = FMT_MPEG1;
2198	if (s1->mpeg_enc_ctx_allocated) {
2199	ff_mpv_common_end(s);
2200	s1->mpeg_enc_ctx_allocated = 0;
2201	}
2202	s->width = avctx->coded_width;
2203	s->height = avctx->coded_height;
2204	avctx->has_b_frames = 0; // true?
2205	s->low_delay = 1;
2206
2207	avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2208	setup_hwaccel_for_pixfmt(avctx);
2209
2210	ff_mpv_idct_init(s);
2211	if ((ret = ff_mpv_common_init(s)) < 0)
2212	return ret;
2213	s1->mpeg_enc_ctx_allocated = 1;
2214
2215	for (i = 0; i < 64; i++) {
2216	int j = s->idsp.idct_permutation[i];
2217	v = ff_mpeg1_default_intra_matrix[i];
2218	s->intra_matrix[j] = v;
2219	s->chroma_intra_matrix[j] = v;
2220
2221	v = ff_mpeg1_default_non_intra_matrix[i];
2222	s->inter_matrix[j] = v;
2223	s->chroma_inter_matrix[j] = v;
2224	}
2225
2226	s->progressive_sequence = 1;
2227	s->progressive_frame = 1;
2228	s->picture_structure = PICT_FRAME;
2229	s->first_field = 0;
2230	s->frame_pred_frame_dct = 1;
2231	s->chroma_format = 1;
2232	if (s->codec_tag == AV_RL32("BW10")) {
2233	s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2234	} else {
2235	s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2236	s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2237	}
2238	s1->save_width = s->width;
2239	s1->save_height = s->height;
2240	s1->save_progressive_seq = s->progressive_sequence;
2241	return 0;
2242	}
2243
2244	static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2245	const uint8_t *p, int buf_size)
2246	{
2247	Mpeg1Context *s1 = avctx->priv_data;
2248
2249	if (buf_size >= 6 &&
2250	p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2251	p[4] == 3 && (p[5] & 0x40)) {
2252	/* extract A53 Part 4 CC data */
2253	int cc_count = p[5] & 0x1f;
2254	if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2255	av_freep(&s1->a53_caption);
2256	s1->a53_caption_size = cc_count * 3;
2257	s1->a53_caption = av_malloc(s1->a53_caption_size);
2258	if (s1->a53_caption)
2259	memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2260	avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2261	}
2262	return 1;
2263	} else if (buf_size >= 11 &&
2264	p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2265	/* extract DVD CC data
2266	*
2267	* uint32_t user_data_start_code 0x000001B2 (big endian)
2268	* uint16_t user_identifier 0x4343 "CC"
2269	* uint8_t user_data_type_code 0x01
2270	* uint8_t caption_block_size 0xF8
2271	* uint8_t
2272	* bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
2273	* bit 6 caption_filler 0
2274	* bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2275	* bit 0 caption_extra_field_added 1=one additional caption word
2276	*
2277	* struct caption_field_block {
2278	* uint8_t
2279	* bit 7:1 caption_filler 0x7F (all 1s)
2280	* bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
2281	* uint8_t caption_first_byte
2282	* uint8_t caption_second_byte
2283	* } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2284	*
2285	* Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2286	* correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2287	* Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2288	* on the even field. There also exist DVDs in the wild that encode an odd field count and the
2289	* caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2290	int cc_count = 0;
2291	int i;
2292	// There is a caption count field in the data, but it is often
2293	// incorrect. So count the number of captions present.
2294	for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2295	cc_count++;
2296	// Transform the DVD format into A53 Part 4 format
2297	if (cc_count > 0) {
2298	av_freep(&s1->a53_caption);
2299	s1->a53_caption_size = cc_count * 6;
2300	s1->a53_caption = av_malloc(s1->a53_caption_size);
2301	if (s1->a53_caption) {
2302	uint8_t field1 = !!(p[4] & 0x80);
2303	uint8_t *cap = s1->a53_caption;
2304	p += 5;
2305	for (i = 0; i < cc_count; i++) {
2306	cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2307	cap[1] = p[1];
2308	cap[2] = p[2];
2309	cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2310	cap[4] = p[4];
2311	cap[5] = p[5];
2312	cap += 6;
2313	p += 6;
2314	}
2315	}
2316	avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2317	}
2318	return 1;
2319	}
2320	return 0;
2321	}
2322
2323	static void mpeg_decode_user_data(AVCodecContext *avctx,
2324	const uint8_t *p, int buf_size)
2325	{
2326	Mpeg1Context *s = avctx->priv_data;
2327	const uint8_t *buf_end = p + buf_size;
2328	Mpeg1Context *s1 = avctx->priv_data;
2329
2330	#if 0
2331	int i;
2332	for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2333	av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2334	}
2335	av_log(avctx, AV_LOG_ERROR, "\n");
2336	#endif
2337
2338	if (buf_size > 29){
2339	int i;
2340	for(i=0; i<20; i++)
2341	if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2342	s->tmpgexs= 1;
2343	}
2344	}
2345	/* we parse the DTG active format information */
2346	if (buf_end - p >= 5 &&
2347	p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2348	int flags = p[4];
2349	p += 5;
2350	if (flags & 0x80) {
2351	/* skip event id */
2352	p += 2;
2353	}
2354	if (flags & 0x40) {
2355	if (buf_end - p < 1)
2356	return;
2357	#if FF_API_AFD
2358	FF_DISABLE_DEPRECATION_WARNINGS
2359	avctx->dtg_active_format = p[0] & 0x0f;
2360	FF_ENABLE_DEPRECATION_WARNINGS
2361	#endif /* FF_API_AFD */
2362	s1->has_afd = 1;
2363	s1->afd = p[0] & 0x0f;
2364	}
2365	} else if (buf_end - p >= 6 &&
2366	p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2367	p[4] == 0x03) { // S3D_video_format_length
2368	// the 0x7F mask ignores the reserved_bit value
2369	const uint8_t S3D_video_format_type = p[5] & 0x7F;
2370
2371	if (S3D_video_format_type == 0x03 ||
2372	S3D_video_format_type == 0x04 ||
2373	S3D_video_format_type == 0x08 ||
2374	S3D_video_format_type == 0x23) {
2375
2376	s1->has_stereo3d = 1;
2377
2378	switch (S3D_video_format_type) {
2379	case 0x03:
2380	s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2381	break;
2382	case 0x04:
2383	s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2384	break;
2385	case 0x08:
2386	s1->stereo3d.type = AV_STEREO3D_2D;
2387	break;
2388	case 0x23:
2389	s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2390	break;
2391	}
2392	}
2393	} else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2394	return;
2395	}
2396	}
2397
2398	static void mpeg_decode_gop(AVCodecContext *avctx,
2399	const uint8_t *buf, int buf_size)
2400	{
2401	Mpeg1Context *s1 = avctx->priv_data;
2402	MpegEncContext *s = &s1->mpeg_enc_ctx;
2403	int broken_link;
2404	int64_t tc;
2405
2406	init_get_bits(&s->gb, buf, buf_size * 8);
2407
2408	tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2409
2410	#if FF_API_PRIVATE_OPT
2411	FF_DISABLE_DEPRECATION_WARNINGS
2412	avctx->timecode_frame_start = tc;
2413	FF_ENABLE_DEPRECATION_WARNINGS
2414	#endif
2415
2416	s->closed_gop = get_bits1(&s->gb);
2417	/* broken_link indicates that after editing the
2418	* reference frames of the first B-Frames after GOP I-Frame
2419	* are missing (open gop) */
2420	broken_link = get_bits1(&s->gb);
2421
2422	if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2423	char tcbuf[AV_TIMECODE_STR_SIZE];
2424	av_timecode_make_mpeg_tc_string(tcbuf, tc);
2425	av_log(s->avctx, AV_LOG_DEBUG,
2426	"GOP (%s) closed_gop=%d broken_link=%d\n",
2427	tcbuf, s->closed_gop, broken_link);
2428	}
2429	}
2430
2431	static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2432	int *got_output, const uint8_t *buf, int buf_size)
2433	{
2434	Mpeg1Context *s = avctx->priv_data;
2435	MpegEncContext *s2 = &s->mpeg_enc_ctx;
2436	const uint8_t *buf_ptr = buf;
2437	const uint8_t *buf_end = buf + buf_size;
2438	int ret, input_size;
2439	int last_code = 0, skip_frame = 0;
2440	int picture_start_code_seen = 0;
2441
2442	for (;;) {
2443	/* find next start code */
2444	uint32_t start_code = -1;
2445	buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2446	if (start_code > 0x1ff) {
2447	if (!skip_frame) {
2448	if (HAVE_THREADS &&
2449	(avctx->active_thread_type & FF_THREAD_SLICE) &&
2450	!avctx->hwaccel) {
2451	int i;
2452	av_assert0(avctx->thread_count > 1);
2453
2454	avctx->execute(avctx, slice_decode_thread,
2455	&s2->thread_context[0], NULL,
2456	s->slice_count, sizeof(void *));
2457	for (i = 0; i < s->slice_count; i++)
2458	s2->er.error_count += s2->thread_context[i]->er.error_count;
2459	}
2460
2461	#if FF_API_VDPAU
2462	if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2463	&& uses_vdpau(avctx))
2464	ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2465	#endif
2466
2467	ret = slice_end(avctx, picture);
2468	if (ret < 0)
2469	return ret;
2470	else if (ret) {
2471	// FIXME: merge with the stuff in mpeg_decode_slice
2472	if (s2->last_picture_ptr || s2->low_delay)
2473	*got_output = 1;
2474	}
2475	}
2476	s2->pict_type = 0;
2477
2478	if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2479	return AVERROR_INVALIDDATA;
2480
2481	return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2482	}
2483
2484	input_size = buf_end - buf_ptr;
2485
2486	if (avctx->debug & FF_DEBUG_STARTCODE)
2487	av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2488	start_code, buf_ptr - buf, input_size);
2489
2490	/* prepare data for next start code */
2491	switch (start_code) {
2492	case SEQ_START_CODE:
2493	if (last_code == 0) {
2494	mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2495	if (buf != avctx->extradata)
2496	s->sync = 1;
2497	} else {
2498	av_log(avctx, AV_LOG_ERROR,
2499	"ignoring SEQ_START_CODE after %X\n", last_code);
2500	if (avctx->err_recognition & AV_EF_EXPLODE)
2501	return AVERROR_INVALIDDATA;
2502	}
2503	break;
2504
2505	case PICTURE_START_CODE:
2506	if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2507	/* If it's a frame picture, there can't be more than one picture header.
2508	Yet, it does happen and we need to handle it. */
2509	av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2510	break;
2511	}
2512	picture_start_code_seen = 1;
2513
2514	if (s2->width <= 0 || s2->height <= 0) {
2515	av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2516	s2->width, s2->height);
2517	return AVERROR_INVALIDDATA;
2518	}
2519
2520	if (s->tmpgexs){
2521	s2->intra_dc_precision= 3;
2522	s2->intra_matrix[0]= 1;
2523	}
2524	if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2525	!avctx->hwaccel && s->slice_count) {
2526	int i;
2527
2528	avctx->execute(avctx, slice_decode_thread,
2529	s2->thread_context, NULL,
2530	s->slice_count, sizeof(void *));
2531	for (i = 0; i < s->slice_count; i++)
2532	s2->er.error_count += s2->thread_context[i]->er.error_count;
2533	s->slice_count = 0;
2534	}
2535	if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2536	ret = mpeg_decode_postinit(avctx);
2537	if (ret < 0) {
2538	av_log(avctx, AV_LOG_ERROR,
2539	"mpeg_decode_postinit() failure\n");
2540	return ret;
2541	}
2542
2543	/* We have a complete image: we try to decompress it. */
2544	if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2545	s2->pict_type = 0;
2546	s->first_slice = 1;
2547	last_code = PICTURE_START_CODE;
2548	} else {
2549	av_log(avctx, AV_LOG_ERROR,
2550	"ignoring pic after %X\n", last_code);
2551	if (avctx->err_recognition & AV_EF_EXPLODE)
2552	return AVERROR_INVALIDDATA;
2553	}
2554	break;
2555	case EXT_START_CODE:
2556	init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2557
2558	switch (get_bits(&s2->gb, 4)) {
2559	case 0x1:
2560	if (last_code == 0) {
2561	mpeg_decode_sequence_extension(s);
2562	} else {
2563	av_log(avctx, AV_LOG_ERROR,
2564	"ignoring seq ext after %X\n", last_code);
2565	if (avctx->err_recognition & AV_EF_EXPLODE)
2566	return AVERROR_INVALIDDATA;
2567	}
2568	break;
2569	case 0x2:
2570	mpeg_decode_sequence_display_extension(s);
2571	break;
2572	case 0x3:
2573	mpeg_decode_quant_matrix_extension(s2);
2574	break;
2575	case 0x7:
2576	mpeg_decode_picture_display_extension(s);
2577	break;
2578	case 0x8:
2579	if (last_code == PICTURE_START_CODE) {
2580	mpeg_decode_picture_coding_extension(s);
2581	} else {
2582	av_log(avctx, AV_LOG_ERROR,
2583	"ignoring pic cod ext after %X\n", last_code);
2584	if (avctx->err_recognition & AV_EF_EXPLODE)
2585	return AVERROR_INVALIDDATA;
2586	}
2587	break;
2588	}
2589	break;
2590	case USER_START_CODE:
2591	mpeg_decode_user_data(avctx, buf_ptr, input_size);
2592	break;
2593	case GOP_START_CODE:
2594	if (last_code == 0) {
2595	s2->first_field = 0;
2596	mpeg_decode_gop(avctx, buf_ptr, input_size);
2597	s->sync = 1;
2598	} else {
2599	av_log(avctx, AV_LOG_ERROR,
2600	"ignoring GOP_START_CODE after %X\n", last_code);
2601	if (avctx->err_recognition & AV_EF_EXPLODE)
2602	return AVERROR_INVALIDDATA;
2603	}
2604	break;
2605	default:
2606	if (start_code >= SLICE_MIN_START_CODE &&
2607	start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2608	if (s2->progressive_sequence && !s2->progressive_frame) {
2609	s2->progressive_frame = 1;
2610	av_log(s2->avctx, AV_LOG_ERROR,
2611	"interlaced frame in progressive sequence, ignoring\n");
2612	}
2613
2614	if (s2->picture_structure == 0 ||
2615	(s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2616	av_log(s2->avctx, AV_LOG_ERROR,
2617	"picture_structure %d invalid, ignoring\n",
2618	s2->picture_structure);
2619	s2->picture_structure = PICT_FRAME;
2620	}
2621
2622	if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2623	av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2624
2625	if (s2->picture_structure == PICT_FRAME) {
2626	s2->first_field = 0;
2627	s2->v_edge_pos = 16 * s2->mb_height;
2628	} else {
2629	s2->first_field ^= 1;
2630	s2->v_edge_pos = 8 * s2->mb_height;
2631	memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2632	}
2633	}
2634	if (start_code >= SLICE_MIN_START_CODE &&
2635	start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2636	const int field_pic = s2->picture_structure != PICT_FRAME;
2637	int mb_y = start_code - SLICE_MIN_START_CODE;
2638	last_code = SLICE_MIN_START_CODE;
2639	if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2640	mb_y += (*buf_ptr&0xE0)<<2;
2641
2642	mb_y <<= field_pic;
2643	if (s2->picture_structure == PICT_BOTTOM_FIELD)
2644	mb_y++;
2645
2646	if (buf_end - buf_ptr < 2) {
2647	av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2648	return AVERROR_INVALIDDATA;
2649	}
2650
2651	if (mb_y >= s2->mb_height) {
2652	av_log(s2->avctx, AV_LOG_ERROR,
2653	"slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2654	return AVERROR_INVALIDDATA;
2655	}
2656
2657	if (!s2->last_picture_ptr) {
2658	/* Skip B-frames if we do not have reference frames and
2659	* GOP is not closed. */
2660	if (s2->pict_type == AV_PICTURE_TYPE_B) {
2661	if (!s2->closed_gop) {
2662	skip_frame = 1;
2663	av_log(s2->avctx, AV_LOG_DEBUG,
2664	"Skipping B slice due to open GOP\n");
2665	break;
2666	}
2667	}
2668	}
2669	if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2670	s->sync = 1;
2671	if (!s2->next_picture_ptr) {
2672	/* Skip P-frames if we do not have a reference frame or
2673	* we have an invalid header. */
2674	if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2675	skip_frame = 1;
2676	av_log(s2->avctx, AV_LOG_DEBUG,
2677	"Skipping P slice due to !sync\n");
2678	break;
2679	}
2680	}
2681	if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2682	s2->pict_type == AV_PICTURE_TYPE_B) ||
2683	(avctx->skip_frame >= AVDISCARD_NONKEY &&
2684	s2->pict_type != AV_PICTURE_TYPE_I) ||
2685	avctx->skip_frame >= AVDISCARD_ALL) {
2686	skip_frame = 1;
2687	break;
2688	}
2689
2690	if (!s->mpeg_enc_ctx_allocated)
2691	break;
2692
2693	if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2694	if (mb_y < avctx->skip_top ||
2695	mb_y >= s2->mb_height - avctx->skip_bottom)
2696	break;
2697	}
2698
2699	if (!s2->pict_type) {
2700	av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2701	if (avctx->err_recognition & AV_EF_EXPLODE)
2702	return AVERROR_INVALIDDATA;
2703	break;
2704	}
2705
2706	if (s->first_slice) {
2707	skip_frame = 0;
2708	s->first_slice = 0;
2709	if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2710	return ret;
2711	}
2712	if (!s2->current_picture_ptr) {
2713	av_log(avctx, AV_LOG_ERROR,
2714	"current_picture not initialized\n");
2715	return AVERROR_INVALIDDATA;
2716	}
2717
2718	#if FF_API_VDPAU
2719	if (uses_vdpau(avctx)) {
2720	s->slice_count++;
2721	break;
2722	}
2723	#endif
2724
2725	if (HAVE_THREADS &&
2726	(avctx->active_thread_type & FF_THREAD_SLICE) &&
2727	!avctx->hwaccel) {
2728	int threshold = (s2->mb_height * s->slice_count +
2729	s2->slice_context_count / 2) /
2730	s2->slice_context_count;
2731	av_assert0(avctx->thread_count > 1);
2732	if (threshold <= mb_y) {
2733	MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2734
2735	thread_context->start_mb_y = mb_y;
2736	thread_context->end_mb_y = s2->mb_height;
2737	if (s->slice_count) {
2738	s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2739	ret = ff_update_duplicate_context(thread_context, s2);
2740	if (ret < 0)
2741	return ret;
2742	}
2743	init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2744	s->slice_count++;
2745	}
2746	buf_ptr += 2; // FIXME add minimum number of bytes per slice
2747	} else {
2748	ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2749	emms_c();
2750
2751	if (ret < 0) {
2752	if (avctx->err_recognition & AV_EF_EXPLODE)
2753	return ret;
2754	if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2755	ff_er_add_slice(&s2->er, s2->resync_mb_x,
2756	s2->resync_mb_y, s2->mb_x, s2->mb_y,
2757	ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2758	} else {
2759	ff_er_add_slice(&s2->er, s2->resync_mb_x,
2760	s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2761	ER_AC_END | ER_DC_END | ER_MV_END);
2762	}
2763	}
2764	}
2765	break;
2766	}
2767	}
2768	}
2769
2770	static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2771	int *got_output, AVPacket *avpkt)
2772	{
2773	const uint8_t *buf = avpkt->data;
2774	int ret;
2775	int buf_size = avpkt->size;
2776	Mpeg1Context *s = avctx->priv_data;
2777	AVFrame *picture = data;
2778	MpegEncContext *s2 = &s->mpeg_enc_ctx;
2779
2780	if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2781	/* special case for last picture */
2782	if (s2->low_delay == 0 && s2->next_picture_ptr) {
2783	int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2784	if (ret < 0)
2785	return ret;
2786
2787	s2->next_picture_ptr = NULL;
2788
2789	*got_output = 1;
2790	}
2791	return buf_size;
2792	}
2793
2794	if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2795	int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2796	buf_size, NULL);
2797
2798	if (ff_combine_frame(&s2->parse_context, next,
2799	(const uint8_t **) &buf, &buf_size) < 0)
2800	return buf_size;
2801	}
2802
2803	s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2804	if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
2805	|| s2->codec_tag == AV_RL32("BW10")
2806	))
2807	vcr2_init_sequence(avctx);
2808
2809	s->slice_count = 0;
2810
2811	if (avctx->extradata && !s->extradata_decoded) {
2812	ret = decode_chunks(avctx, picture, got_output,
2813	avctx->extradata, avctx->extradata_size);
2814	if (*got_output) {
2815	av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2816	av_frame_unref(picture);
2817	*got_output = 0;
2818	}
2819	s->extradata_decoded = 1;
2820	if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2821	s2->current_picture_ptr = NULL;
2822	return ret;
2823	}
2824	}
2825
2826	ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2827	if (ret<0 || *got_output) {
2828	s2->current_picture_ptr = NULL;
2829
2830	if (s2->timecode_frame_start != -1 && *got_output) {
2831	AVFrameSideData *tcside = av_frame_new_side_data(picture,
2832	AV_FRAME_DATA_GOP_TIMECODE,
2833	sizeof(int64_t));
2834	if (!tcside)
2835	return AVERROR(ENOMEM);
2836	memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2837
2838	s2->timecode_frame_start = -1;
2839	}
2840	}
2841
2842	return ret;
2843	}
2844
2845	static void flush(AVCodecContext *avctx)
2846	{
2847	Mpeg1Context *s = avctx->priv_data;
2848
2849	s->sync = 0;
2850
2851	ff_mpeg_flush(avctx);
2852	}
2853
2854	static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2855	{
2856	Mpeg1Context *s = avctx->priv_data;
2857
2858	if (s->mpeg_enc_ctx_allocated)
2859	ff_mpv_common_end(&s->mpeg_enc_ctx);
2860	av_freep(&s->a53_caption);
2861	return 0;
2862	}
2863
2864	AVCodec ff_mpeg1video_decoder = {
2865	.name = "mpeg1video",
2866	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2867	.type = AVMEDIA_TYPE_VIDEO,
2868	.id = AV_CODEC_ID_MPEG1VIDEO,
2869	.priv_data_size = sizeof(Mpeg1Context),
2870	.init = mpeg_decode_init,
2871	.close = mpeg_decode_end,
2872	.decode = mpeg_decode_frame,
2873	.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2874	AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2875	AV_CODEC_CAP_SLICE_THREADS,
2876	.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2877	.flush = flush,
2878	.max_lowres = 3,
2879	.update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2880	};
2881
2882	AVCodec ff_mpeg2video_decoder = {
2883	.name = "mpeg2video",
2884	.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2885	.type = AVMEDIA_TYPE_VIDEO,
2886	.id = AV_CODEC_ID_MPEG2VIDEO,
2887	.priv_data_size = sizeof(Mpeg1Context),
2888	.init = mpeg_decode_init,
2889	.close = mpeg_decode_end,
2890	.decode = mpeg_decode_frame,
2891	.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2892	AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2893	AV_CODEC_CAP_SLICE_THREADS,
2894	.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2895	.flush = flush,
2896	.max_lowres = 3,
2897	.profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2898	};
2899
2900	//legacy decoder
2901	AVCodec ff_mpegvideo_decoder = {
2902	.name = "mpegvideo",
2903	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2904	.type = AVMEDIA_TYPE_VIDEO,
2905	.id = AV_CODEC_ID_MPEG2VIDEO,
2906	.priv_data_size = sizeof(Mpeg1Context),
2907	.init = mpeg_decode_init,
2908	.close = mpeg_decode_end,
2909	.decode = mpeg_decode_frame,
2910	.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2911	.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2912	.flush = flush,
2913	.max_lowres = 3,
2914	};
2915
2916	#if FF_API_XVMC
2917	#if CONFIG_MPEG_XVMC_DECODER
2918	FF_DISABLE_DEPRECATION_WARNINGS
2919	static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
2920	{
2921	if (avctx->active_thread_type & FF_THREAD_SLICE)
2922	return -1;
2923	if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
2924	return -1;
2925	if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2926	ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2927	}
2928	mpeg_decode_init(avctx);
2929
2930	avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
2931	avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
2932
2933	return 0;
2934	}
2935
2936	AVCodec ff_mpeg_xvmc_decoder = {
2937	.name = "mpegvideo_xvmc",
2938	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2939	.type = AVMEDIA_TYPE_VIDEO,
2940	.id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
2941	.priv_data_size = sizeof(Mpeg1Context),
2942	.init = mpeg_mc_decode_init,
2943	.close = mpeg_decode_end,
2944	.decode = mpeg_decode_frame,
2945	.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2946	AV_CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL |
2947	AV_CODEC_CAP_DELAY,
2948	.flush = flush,
2949	};
2950	FF_ENABLE_DEPRECATION_WARNINGS
2951	#endif
2952	#endif /* FF_API_XVMC */
2953
2954	#if CONFIG_MPEG_VDPAU_DECODER && FF_API_VDPAU
2955	AVCodec ff_mpeg_vdpau_decoder = {
2956	.name = "mpegvideo_vdpau",
2957	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2958	.type = AVMEDIA_TYPE_VIDEO,
2959	.id = AV_CODEC_ID_MPEG2VIDEO,
2960	.priv_data_size = sizeof(Mpeg1Context),
2961	.init = mpeg_decode_init,
2962	.close = mpeg_decode_end,
2963	.decode = mpeg_decode_frame,
2964	.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2965	AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2966	.flush = flush,
2967	};
2968	#endif
2969
2970	#if CONFIG_MPEG1_VDPAU_DECODER && FF_API_VDPAU
2971	AVCodec ff_mpeg1_vdpau_decoder = {
2972	.name = "mpeg1video_vdpau",
2973	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2974	.type = AVMEDIA_TYPE_VIDEO,
2975	.id = AV_CODEC_ID_MPEG1VIDEO,
2976	.priv_data_size = sizeof(Mpeg1Context),
2977	.init = mpeg_decode_init,
2978	.close = mpeg_decode_end,
2979	.decode = mpeg_decode_frame,
2980	.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED |
2981	AV_CODEC_CAP_HWACCEL_VDPAU | AV_CODEC_CAP_DELAY,
2982	.flush = flush,
2983	};
2984	#endif
2985