WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/libavcodec/mpeg12dec.c

Rev	Author	Line No.	Line
4349	Serge	1	/*
		2	* MPEG-1/2 decoder
		3	* Copyright (c) 2000, 2001 Fabrice Bellard
		4	* Copyright (c) 2002-2013 Michael Niedermayer
		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	#include "libavutil/attributes.h"
		29	#include "libavutil/internal.h"
		30	#include "internal.h"
		31	#include "avcodec.h"
		32	#include "dsputil.h"
		33	#include "mpegvideo.h"
		34	#include "error_resilience.h"
		35	#include "mpeg12.h"
		36	#include "mpeg12data.h"
		37	#include "bytestream.h"
		38	#include "vdpau_internal.h"
		39	#include "xvmc_internal.h"
		40	#include "thread.h"
		41
		42	typedef struct Mpeg1Context {
		43	MpegEncContext mpeg_enc_ctx;
		44	int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
		45	int repeat_field; /* true if we must repeat the field */
		46	AVPanScan pan_scan; /*< some temporary storage for the panscan /
		47	int slice_count;
		48	int swap_uv;//indicate VCR2
		49	int save_aspect_info;
		50	int save_width, save_height, save_progressive_seq;
		51	AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
		52	int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
		53	int tmpgexs;
		54	int extradata_decoded;
		55	} Mpeg1Context;
		56
		57	#define MB_TYPE_ZERO_MV 0x20000000
		58
		59	static const uint32_t ptype2mb_type[7] = {
		60	MB_TYPE_INTRA,
		61	MB_TYPE_L0 \| MB_TYPE_CBP \| MB_TYPE_ZERO_MV \| MB_TYPE_16x16,
		62	MB_TYPE_L0,
		63	MB_TYPE_L0 \| MB_TYPE_CBP,
		64	MB_TYPE_QUANT \| MB_TYPE_INTRA,
		65	MB_TYPE_QUANT \| MB_TYPE_L0 \| MB_TYPE_CBP \| MB_TYPE_ZERO_MV \| MB_TYPE_16x16,
		66	MB_TYPE_QUANT \| MB_TYPE_L0 \| MB_TYPE_CBP,
		67	};
		68
		69	static const uint32_t btype2mb_type[11] = {
		70	MB_TYPE_INTRA,
		71	MB_TYPE_L1,
		72	MB_TYPE_L1 \| MB_TYPE_CBP,
		73	MB_TYPE_L0,
		74	MB_TYPE_L0 \| MB_TYPE_CBP,
		75	MB_TYPE_L0L1,
		76	MB_TYPE_L0L1 \| MB_TYPE_CBP,
		77	MB_TYPE_QUANT \| MB_TYPE_INTRA,
		78	MB_TYPE_QUANT \| MB_TYPE_L1 \| MB_TYPE_CBP,
		79	MB_TYPE_QUANT \| MB_TYPE_L0 \| MB_TYPE_CBP,
		80	MB_TYPE_QUANT \| MB_TYPE_L0L1 \| MB_TYPE_CBP,
		81	};
		82
		83	static const uint8_t non_linear_qscale[32] = {
		84	0, 1, 2, 3, 4, 5, 6, 7,
		85	8,10,12,14,16,18,20,22,
		86	24,28,32,36,40,44,48,52,
		87	56,64,72,80,88,96,104,112,
		88	};
		89
		90	/* as H.263, but only 17 codes */
		91	static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
		92	{
		93	int code, sign, val, shift;
		94
		95	code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
		96	if (code == 0) {
		97	return pred;
		98	}
		99	if (code < 0) {
		100	return 0xffff;
		101	}
		102
		103	sign = get_bits1(&s->gb);
		104	shift = fcode - 1;
		105	val = code;
		106	if (shift) {
		107	val = (val - 1) << shift;
		108	val \|= get_bits(&s->gb, shift);
		109	val++;
		110	}
		111	if (sign)
		112	val = -val;
		113	val += pred;
		114
		115	/* modulo decoding */
		116	return sign_extend(val, 5 + shift);
		117	}
		118
		119	static inline int mpeg1_decode_block_intra(MpegEncContext s, int16_t block, int n)
		120	{
		121	int level, dc, diff, i, j, run;
		122	int component;
		123	RLTable *rl = &ff_rl_mpeg1;
		124	uint8_t * const scantable = s->intra_scantable.permutated;
		125	const uint16_t *quant_matrix = s->intra_matrix;
		126	const int qscale = s->qscale;
		127
		128	/* DC coefficient */
		129	component = (n <= 3 ? 0 : n - 4 + 1);
		130	diff = decode_dc(&s->gb, component);
		131	if (diff >= 0xffff)
		132	return -1;
		133	dc = s->last_dc[component];
		134	dc += diff;
		135	s->last_dc[component] = dc;
		136	block[0] = dc * quant_matrix[0];
		137	av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
		138	i = 0;
		139	{
		140	OPEN_READER(re, &s->gb);
		141	/* now quantify & encode AC coefficients */
		142	for (;;) {
		143	UPDATE_CACHE(re, &s->gb);
		144	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
		145
		146	if (level == 127) {
		147	break;
		148	} else if (level != 0) {
		149	i += run;
		150	j = scantable[i];
		151	level = (level * qscale * quant_matrix[j]) >> 4;
		152	level = (level - 1) \| 1;
		153	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
		154	LAST_SKIP_BITS(re, &s->gb, 1);
		155	} else {
		156	/* escape */
		157	run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
		158	UPDATE_CACHE(re, &s->gb);
		159	level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
		160	if (level == -128) {
		161	level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
		162	} else if (level == 0) {
		163	level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
		164	}
		165	i += run;
		166	j = scantable[i];
		167	if (level < 0) {
		168	level = -level;
		169	level = (level * qscale * quant_matrix[j]) >> 4;
		170	level = (level - 1) \| 1;
		171	level = -level;
		172	} else {
		173	level = (level * qscale * quant_matrix[j]) >> 4;
		174	level = (level - 1) \| 1;
		175	}
		176	}
		177	if (i > 63) {
		178	av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
		179	return -1;
		180	}
		181
		182	block[j] = level;
		183	}
		184	CLOSE_READER(re, &s->gb);
		185	}
		186	s->block_last_index[n] = i;
		187	return 0;
		188	}
		189
		190	int ff_mpeg1_decode_block_intra(MpegEncContext s, int16_t block, int n)
		191	{
		192	return mpeg1_decode_block_intra(s, block, n);
		193	}
		194
		195	static inline int mpeg1_decode_block_inter(MpegEncContext s, int16_t block, int n)
		196	{
		197	int level, i, j, run;
		198	RLTable *rl = &ff_rl_mpeg1;
		199	uint8_t * const scantable = s->intra_scantable.permutated;
		200	const uint16_t *quant_matrix = s->inter_matrix;
		201	const int qscale = s->qscale;
		202
		203	{
		204	OPEN_READER(re, &s->gb);
		205	i = -1;
		206	// special case for first coefficient, no need to add second VLC table
		207	UPDATE_CACHE(re, &s->gb);
		208	if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
		209	level = (3 * qscale * quant_matrix[0]) >> 5;
		210	level = (level - 1) \| 1;
		211	if (GET_CACHE(re, &s->gb) & 0x40000000)
		212	level = -level;
		213	block[0] = level;
		214	i++;
		215	SKIP_BITS(re, &s->gb, 2);
		216	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		217	goto end;
		218	}
		219	/* now quantify & encode AC coefficients */
		220	for (;;) {
		221	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
		222
		223	if (level != 0) {
		224	i += run;
		225	j = scantable[i];
		226	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
		227	level = (level - 1) \| 1;
		228	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
		229	SKIP_BITS(re, &s->gb, 1);
		230	} else {
		231	/* escape */
		232	run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
		233	UPDATE_CACHE(re, &s->gb);
		234	level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
		235	if (level == -128) {
		236	level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
		237	} else if (level == 0) {
		238	level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
		239	}
		240	i += run;
		241	j = scantable[i];
		242	if (level < 0) {
		243	level = -level;
		244	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
		245	level = (level - 1) \| 1;
		246	level = -level;
		247	} else {
		248	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
		249	level = (level - 1) \| 1;
		250	}
		251	}
		252	if (i > 63) {
		253	av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
		254	return -1;
		255	}
		256
		257	block[j] = level;
		258	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		259	break;
		260	UPDATE_CACHE(re, &s->gb);
		261	}
		262	end:
		263	LAST_SKIP_BITS(re, &s->gb, 2);
		264	CLOSE_READER(re, &s->gb);
		265	}
		266	s->block_last_index[n] = i;
		267	return 0;
		268	}
		269
		270	/**
		271	* Note: this function can read out of range and crash for corrupt streams.
		272	* Changing this would eat up any speed benefits it has.
		273	* Do not use "fast" flag if you need the code to be robust.
		274	*/
		275	static inline int mpeg1_fast_decode_block_inter(MpegEncContext s, int16_t block, int n)
		276	{
		277	int level, i, j, run;
		278	RLTable *rl = &ff_rl_mpeg1;
		279	uint8_t * const scantable = s->intra_scantable.permutated;
		280	const int qscale = s->qscale;
		281
		282	{
		283	OPEN_READER(re, &s->gb);
		284	i = -1;
		285	// special case for first coefficient, no need to add second VLC table
		286	UPDATE_CACHE(re, &s->gb);
		287	if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
		288	level = (3 * qscale) >> 1;
		289	level = (level - 1) \| 1;
		290	if (GET_CACHE(re, &s->gb) & 0x40000000)
		291	level = -level;
		292	block[0] = level;
		293	i++;
		294	SKIP_BITS(re, &s->gb, 2);
		295	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		296	goto end;
		297	}
		298
		299	/* now quantify & encode AC coefficients */
		300	for (;;) {
		301	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
		302
		303	if (level != 0) {
		304	i += run;
		305	j = scantable[i];
		306	level = ((level * 2 + 1) * qscale) >> 1;
		307	level = (level - 1) \| 1;
		308	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
		309	SKIP_BITS(re, &s->gb, 1);
		310	} else {
		311	/* escape */
		312	run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
		313	UPDATE_CACHE(re, &s->gb);
		314	level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
		315	if (level == -128) {
		316	level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
		317	} else if (level == 0) {
		318	level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
		319	}
		320	i += run;
		321	j = scantable[i];
		322	if (level < 0) {
		323	level = -level;
		324	level = ((level * 2 + 1) * qscale) >> 1;
		325	level = (level - 1) \| 1;
		326	level = -level;
		327	} else {
		328	level = ((level * 2 + 1) * qscale) >> 1;
		329	level = (level - 1) \| 1;
		330	}
		331	}
		332
		333	block[j] = level;
		334	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		335	break;
		336	UPDATE_CACHE(re, &s->gb);
		337	}
		338	end:
		339	LAST_SKIP_BITS(re, &s->gb, 2);
		340	CLOSE_READER(re, &s->gb);
		341	}
		342	s->block_last_index[n] = i;
		343	return 0;
		344	}
		345
		346
		347	static inline int mpeg2_decode_block_non_intra(MpegEncContext s, int16_t block, int n)
		348	{
		349	int level, i, j, run;
		350	RLTable *rl = &ff_rl_mpeg1;
		351	uint8_t * const scantable = s->intra_scantable.permutated;
		352	const uint16_t *quant_matrix;
		353	const int qscale = s->qscale;
		354	int mismatch;
		355
		356	mismatch = 1;
		357
		358	{
		359	OPEN_READER(re, &s->gb);
		360	i = -1;
		361	if (n < 4)
		362	quant_matrix = s->inter_matrix;
		363	else
		364	quant_matrix = s->chroma_inter_matrix;
		365
		366	// special case for first coefficient, no need to add second VLC table
		367	UPDATE_CACHE(re, &s->gb);
		368	if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
		369	level= (3 * qscale * quant_matrix[0]) >> 5;
		370	if (GET_CACHE(re, &s->gb) & 0x40000000)
		371	level = -level;
		372	block[0] = level;
		373	mismatch ^= level;
		374	i++;
		375	SKIP_BITS(re, &s->gb, 2);
		376	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		377	goto end;
		378	}
		379
		380	/* now quantify & encode AC coefficients */
		381	for (;;) {
		382	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
		383
		384	if (level != 0) {
		385	i += run;
		386	j = scantable[i];
		387	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
		388	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
		389	SKIP_BITS(re, &s->gb, 1);
		390	} else {
		391	/* escape */
		392	run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
		393	UPDATE_CACHE(re, &s->gb);
		394	level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
		395
		396	i += run;
		397	j = scantable[i];
		398	if (level < 0) {
		399	level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
		400	level = -level;
		401	} else {
		402	level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
		403	}
		404	}
		405	if (i > 63) {
		406	av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
		407	return -1;
		408	}
		409
		410	mismatch ^= level;
		411	block[j] = level;
		412	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		413	break;
		414	UPDATE_CACHE(re, &s->gb);
		415	}
		416	end:
		417	LAST_SKIP_BITS(re, &s->gb, 2);
		418	CLOSE_READER(re, &s->gb);
		419	}
		420	block[63] ^= (mismatch & 1);
		421
		422	s->block_last_index[n] = i;
		423	return 0;
		424	}
		425
		426	/**
		427	* Note: this function can read out of range and crash for corrupt streams.
		428	* Changing this would eat up any speed benefits it has.
		429	* Do not use "fast" flag if you need the code to be robust.
		430	*/
		431	static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
		432	int16_t *block, int n)
		433	{
		434	int level, i, j, run;
		435	RLTable *rl = &ff_rl_mpeg1;
		436	uint8_t * const scantable = s->intra_scantable.permutated;
		437	const int qscale = s->qscale;
		438	OPEN_READER(re, &s->gb);
		439	i = -1;
		440
		441	// special case for first coefficient, no need to add second VLC table
		442	UPDATE_CACHE(re, &s->gb);
		443	if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
		444	level = (3 * qscale) >> 1;
		445	if (GET_CACHE(re, &s->gb) & 0x40000000)
		446	level = -level;
		447	block[0] = level;
		448	i++;
		449	SKIP_BITS(re, &s->gb, 2);
		450	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		451	goto end;
		452	}
		453
		454	/* now quantify & encode AC coefficients */
		455	for (;;) {
		456	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
		457
		458	if (level != 0) {
		459	i += run;
		460	j = scantable[i];
		461	level = ((level * 2 + 1) * qscale) >> 1;
		462	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
		463	SKIP_BITS(re, &s->gb, 1);
		464	} else {
		465	/* escape */
		466	run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
		467	UPDATE_CACHE(re, &s->gb);
		468	level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
		469
		470	i += run;
		471	j = scantable[i];
		472	if (level < 0) {
		473	level = ((-level * 2 + 1) * qscale) >> 1;
		474	level = -level;
		475	} else {
		476	level = ((level * 2 + 1) * qscale) >> 1;
		477	}
		478	}
		479
		480	block[j] = level;
		481	if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
		482	break;
		483	UPDATE_CACHE(re, &s->gb);
		484	}
		485	end:
		486	LAST_SKIP_BITS(re, &s->gb, 2);
		487	CLOSE_READER(re, &s->gb);
		488	s->block_last_index[n] = i;
		489	return 0;
		490	}
		491
		492
		493	static inline int mpeg2_decode_block_intra(MpegEncContext s, int16_t block, int n)
		494	{
		495	int level, dc, diff, i, j, run;
		496	int component;
		497	RLTable *rl;
		498	uint8_t * const scantable = s->intra_scantable.permutated;
		499	const uint16_t *quant_matrix;
		500	const int qscale = s->qscale;
		501	int mismatch;
		502
		503	/* DC coefficient */
		504	if (n < 4) {
		505	quant_matrix = s->intra_matrix;
		506	component = 0;
		507	} else {
		508	quant_matrix = s->chroma_intra_matrix;
		509	component = (n & 1) + 1;
		510	}
		511	diff = decode_dc(&s->gb, component);
		512	if (diff >= 0xffff)
		513	return -1;
		514	dc = s->last_dc[component];
		515	dc += diff;
		516	s->last_dc[component] = dc;
		517	block[0] = dc << (3 - s->intra_dc_precision);
		518	av_dlog(s->avctx, "dc=%d\n", block[0]);
		519	mismatch = block[0] ^ 1;
		520	i = 0;
		521	if (s->intra_vlc_format)
		522	rl = &ff_rl_mpeg2;
		523	else
		524	rl = &ff_rl_mpeg1;
		525
		526	{
		527	OPEN_READER(re, &s->gb);
		528	/* now quantify & encode AC coefficients */
		529	for (;;) {
		530	UPDATE_CACHE(re, &s->gb);
		531	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
		532
		533	if (level == 127) {
		534	break;
		535	} else if (level != 0) {
		536	i += run;
		537	j = scantable[i];
		538	level = (level * qscale * quant_matrix[j]) >> 4;
		539	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
		540	LAST_SKIP_BITS(re, &s->gb, 1);
		541	} else {
		542	/* escape */
		543	run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
		544	UPDATE_CACHE(re, &s->gb);
		545	level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
		546	i += run;
		547	j = scantable[i];
		548	if (level < 0) {
		549	level = (-level * qscale * quant_matrix[j]) >> 4;
		550	level = -level;
		551	} else {
		552	level = (level * qscale * quant_matrix[j]) >> 4;
		553	}
		554	}
		555	if (i > 63) {
		556	av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
		557	return -1;
		558	}
		559
		560	mismatch ^= level;
		561	block[j] = level;
		562	}
		563	CLOSE_READER(re, &s->gb);
		564	}
		565	block[63] ^= mismatch & 1;
		566
		567	s->block_last_index[n] = i;
		568	return 0;
		569	}
		570
		571	/**
		572	* Note: this function can read out of range and crash for corrupt streams.
		573	* Changing this would eat up any speed benefits it has.
		574	* Do not use "fast" flag if you need the code to be robust.
		575	*/
		576	static inline int mpeg2_fast_decode_block_intra(MpegEncContext s, int16_t block, int n)
		577	{
		578	int level, dc, diff, j, run;
		579	int component;
		580	RLTable *rl;
		581	uint8_t * scantable = s->intra_scantable.permutated;
		582	const uint16_t *quant_matrix;
		583	const int qscale = s->qscale;
		584
		585	/* DC coefficient */
		586	if (n < 4) {
		587	quant_matrix = s->intra_matrix;
		588	component = 0;
		589	} else {
		590	quant_matrix = s->chroma_intra_matrix;
		591	component = (n & 1) + 1;
		592	}
		593	diff = decode_dc(&s->gb, component);
		594	if (diff >= 0xffff)
		595	return -1;
		596	dc = s->last_dc[component];
		597	dc += diff;
		598	s->last_dc[component] = dc;
		599	block[0] = dc << (3 - s->intra_dc_precision);
		600	if (s->intra_vlc_format)
		601	rl = &ff_rl_mpeg2;
		602	else
		603	rl = &ff_rl_mpeg1;
		604
		605	{
		606	OPEN_READER(re, &s->gb);
		607	/* now quantify & encode AC coefficients */
		608	for (;;) {
		609	UPDATE_CACHE(re, &s->gb);
		610	GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
		611
		612	if (level == 127) {
		613	break;
		614	} else if (level != 0) {
		615	scantable += run;
		616	j = *scantable;
		617	level = (level * qscale * quant_matrix[j]) >> 4;
		618	level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
		619	LAST_SKIP_BITS(re, &s->gb, 1);
		620	} else {
		621	/* escape */
		622	run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
		623	UPDATE_CACHE(re, &s->gb);
		624	level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
		625	scantable += run;
		626	j = *scantable;
		627	if (level < 0) {
		628	level = (-level * qscale * quant_matrix[j]) >> 4;
		629	level = -level;
		630	} else {
		631	level = (level * qscale * quant_matrix[j]) >> 4;
		632	}
		633	}
		634
		635	block[j] = level;
		636	}
		637	CLOSE_READER(re, &s->gb);
		638	}
		639
		640	s->block_last_index[n] = scantable - s->intra_scantable.permutated;
		641	return 0;
		642	}
		643
		644	/******************************************/
		645	/* decoding */
		646
		647	static inline int get_dmv(MpegEncContext *s)
		648	{
		649	if (get_bits1(&s->gb))
		650	return 1 - (get_bits1(&s->gb) << 1);
		651	else
		652	return 0;
		653	}
		654
		655	static inline int get_qscale(MpegEncContext *s)
		656	{
		657	int qscale = get_bits(&s->gb, 5);
		658	if (s->q_scale_type) {
		659	return non_linear_qscale[qscale];
		660	} else {
		661	return qscale << 1;
		662	}
		663	}
		664
		665	static void exchange_uv(MpegEncContext *s)
		666	{
		667	int16_t (*tmp)[64];
		668
		669	tmp = s->pblocks[4];
		670	s->pblocks[4] = s->pblocks[5];
		671	s->pblocks[5] = tmp;
		672	}
		673
		674	/* motion type (for MPEG-2) */
		675	#define MT_FIELD 1
		676	#define MT_FRAME 2
		677	#define MT_16X8 2
		678	#define MT_DMV 3
		679
		680	static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
		681	{
		682	int i, j, k, cbp, val, mb_type, motion_type;
		683	const int mb_block_count = 4 + (1 << s->chroma_format);
		684
		685	av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
		686
		687	av_assert2(s->mb_skipped == 0);
		688
		689	if (s->mb_skip_run-- != 0) {
		690	if (s->pict_type == AV_PICTURE_TYPE_P) {
		691	s->mb_skipped = 1;
		692	s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP \| MB_TYPE_L0 \| MB_TYPE_16x16;
		693	} else {
		694	int mb_type;
		695
		696	if (s->mb_x)
		697	mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
		698	else
		699	mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
		700	if (IS_INTRA(mb_type)) {
		701	av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
		702	return -1;
		703	}
		704	s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
		705	mb_type \| MB_TYPE_SKIP;
		706
		707	if ((s->mv[0][0][0] \| s->mv[0][0][1] \| s->mv[1][0][0] \| s->mv[1][0][1]) == 0)
		708	s->mb_skipped = 1;
		709	}
		710
		711	return 0;
		712	}
		713
		714	switch (s->pict_type) {
		715	default:
		716	case AV_PICTURE_TYPE_I:
		717	if (get_bits1(&s->gb) == 0) {
		718	if (get_bits1(&s->gb) == 0) {
		719	av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
		720	return -1;
		721	}
		722	mb_type = MB_TYPE_QUANT \| MB_TYPE_INTRA;
		723	} else {
		724	mb_type = MB_TYPE_INTRA;
		725	}
		726	break;
		727	case AV_PICTURE_TYPE_P:
		728	mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
		729	if (mb_type < 0) {
		730	av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
		731	return -1;
		732	}
		733	mb_type = ptype2mb_type[mb_type];
		734	break;
		735	case AV_PICTURE_TYPE_B:
		736	mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
		737	if (mb_type < 0) {
		738	av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
		739	return -1;
		740	}
		741	mb_type = btype2mb_type[mb_type];
		742	break;
		743	}
		744	av_dlog(s->avctx, "mb_type=%x\n", mb_type);
		745	// motion_type = 0; /* avoid warning */
		746	if (IS_INTRA(mb_type)) {
		747	s->dsp.clear_blocks(s->block[0]);
		748
		749	if (!s->chroma_y_shift) {
		750	s->dsp.clear_blocks(s->block[6]);
		751	}
		752
		753	/* compute DCT type */
		754	if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
		755	!s->frame_pred_frame_dct) {
		756	s->interlaced_dct = get_bits1(&s->gb);
		757	}
		758
		759	if (IS_QUANT(mb_type))
		760	s->qscale = get_qscale(s);
		761
		762	if (s->concealment_motion_vectors) {
		763	/* just parse them */
		764	if (s->picture_structure != PICT_FRAME)
		765	skip_bits1(&s->gb); /* field select */
		766
		767	s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
		768	mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
		769	s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
		770	mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
		771
		772	skip_bits1(&s->gb); /* marker */
		773	} else
		774	memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
		775	s->mb_intra = 1;
		776	// if 1, we memcpy blocks in xvmcvideo
		777	if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
		778	ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
		779	if (s->swap_uv) {
		780	exchange_uv(s);
		781	}
		782	}
		783
		784	if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
		785	if (s->flags2 & CODEC_FLAG2_FAST) {
		786	for (i = 0; i < 6; i++) {
		787	mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
		788	}
		789	} else {
		790	for (i = 0; i < mb_block_count; i++) {
		791	if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
		792	return -1;
		793	}
		794	}
		795	} else {
		796	for (i = 0; i < 6; i++) {
		797	if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
		798	return -1;
		799	}
		800	}
		801	} else {
		802	if (mb_type & MB_TYPE_ZERO_MV) {
		803	av_assert2(mb_type & MB_TYPE_CBP);
		804
		805	s->mv_dir = MV_DIR_FORWARD;
		806	if (s->picture_structure == PICT_FRAME) {
		807	if (s->picture_structure == PICT_FRAME
		808	&& !s->frame_pred_frame_dct)
		809	s->interlaced_dct = get_bits1(&s->gb);
		810	s->mv_type = MV_TYPE_16X16;
		811	} else {
		812	s->mv_type = MV_TYPE_FIELD;
		813	mb_type \|= MB_TYPE_INTERLACED;
		814	s->field_select[0][0] = s->picture_structure - 1;
		815	}
		816
		817	if (IS_QUANT(mb_type))
		818	s->qscale = get_qscale(s);
		819
		820	s->last_mv[0][0][0] = 0;
		821	s->last_mv[0][0][1] = 0;
		822	s->last_mv[0][1][0] = 0;
		823	s->last_mv[0][1][1] = 0;
		824	s->mv[0][0][0] = 0;
		825	s->mv[0][0][1] = 0;
		826	} else {
		827	av_assert2(mb_type & MB_TYPE_L0L1);
		828	// FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
		829	/* get additional motion vector type */
		830	if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
		831	motion_type = MT_FRAME;
		832	else {
		833	motion_type = get_bits(&s->gb, 2);
		834	if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
		835	s->interlaced_dct = get_bits1(&s->gb);
		836	}
		837
		838	if (IS_QUANT(mb_type))
		839	s->qscale = get_qscale(s);
		840
		841	/* motion vectors */
		842	s->mv_dir = (mb_type >> 13) & 3;
		843	av_dlog(s->avctx, "motion_type=%d\n", motion_type);
		844	switch (motion_type) {
		845	case MT_FRAME: /* or MT_16X8 */
		846	if (s->picture_structure == PICT_FRAME) {
		847	mb_type \|= MB_TYPE_16x16;
		848	s->mv_type = MV_TYPE_16X16;
		849	for (i = 0; i < 2; i++) {
		850	if (USES_LIST(mb_type, i)) {
		851	/* MT_FRAME */
		852	s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
		853	mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
		854	s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
		855	mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
		856	/* full_pel: only for MPEG-1 */
		857	if (s->full_pel[i]) {
		858	s->mv[i][0][0] <<= 1;
		859	s->mv[i][0][1] <<= 1;
		860	}
		861	}
		862	}
		863	} else {
		864	mb_type \|= MB_TYPE_16x8 \| MB_TYPE_INTERLACED;
		865	s->mv_type = MV_TYPE_16X8;
		866	for (i = 0; i < 2; i++) {
		867	if (USES_LIST(mb_type, i)) {
		868	/* MT_16X8 */
		869	for (j = 0; j < 2; j++) {
		870	s->field_select[i][j] = get_bits1(&s->gb);
		871	for (k = 0; k < 2; k++) {
		872	val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
		873	s->last_mv[i][j][k]);
		874	s->last_mv[i][j][k] = val;
		875	s->mv[i][j][k] = val;
		876	}
		877	}
		878	}
		879	}
		880	}
		881	break;
		882	case MT_FIELD:
		883	s->mv_type = MV_TYPE_FIELD;
		884	if (s->picture_structure == PICT_FRAME) {
		885	mb_type \|= MB_TYPE_16x8 \| MB_TYPE_INTERLACED;
		886	for (i = 0; i < 2; i++) {
		887	if (USES_LIST(mb_type, i)) {
		888	for (j = 0; j < 2; j++) {
		889	s->field_select[i][j] = get_bits1(&s->gb);
		890	val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
		891	s->last_mv[i][j][0]);
		892	s->last_mv[i][j][0] = val;
		893	s->mv[i][j][0] = val;
		894	av_dlog(s->avctx, "fmx=%d\n", val);
		895	val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
		896	s->last_mv[i][j][1] >> 1);
		897	s->last_mv[i][j][1] = val << 1;
		898	s->mv[i][j][1] = val;
		899	av_dlog(s->avctx, "fmy=%d\n", val);
		900	}
		901	}
		902	}
		903	} else {
		904	av_assert0(!s->progressive_sequence);
		905	mb_type \|= MB_TYPE_16x16 \| MB_TYPE_INTERLACED;
		906	for (i = 0; i < 2; i++) {
		907	if (USES_LIST(mb_type, i)) {
		908	s->field_select[i][0] = get_bits1(&s->gb);
		909	for (k = 0; k < 2; k++) {
		910	val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
		911	s->last_mv[i][0][k]);
		912	s->last_mv[i][0][k] = val;
		913	s->last_mv[i][1][k] = val;
		914	s->mv[i][0][k] = val;
		915	}
		916	}
		917	}
		918	}
		919	break;
		920	case MT_DMV:
		921	if(s->progressive_sequence){
		922	av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
		923	return -1;
		924	}
		925	s->mv_type = MV_TYPE_DMV;
		926	for (i = 0; i < 2; i++) {
		927	if (USES_LIST(mb_type, i)) {
		928	int dmx, dmy, mx, my, m;
		929	const int my_shift = s->picture_structure == PICT_FRAME;
		930
		931	mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
		932	s->last_mv[i][0][0]);
		933	s->last_mv[i][0][0] = mx;
		934	s->last_mv[i][1][0] = mx;
		935	dmx = get_dmv(s);
		936	my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
		937	s->last_mv[i][0][1] >> my_shift);
		938	dmy = get_dmv(s);
		939
		940
		941	s->last_mv[i][0][1] = my << my_shift;
		942	s->last_mv[i][1][1] = my << my_shift;
		943
		944	s->mv[i][0][0] = mx;
		945	s->mv[i][0][1] = my;
		946	s->mv[i][1][0] = mx; // not used
		947	s->mv[i][1][1] = my; // not used
		948
		949	if (s->picture_structure == PICT_FRAME) {
		950	mb_type \|= MB_TYPE_16x16 \| MB_TYPE_INTERLACED;
		951
		952	// m = 1 + 2 * s->top_field_first;
		953	m = s->top_field_first ? 1 : 3;
		954
		955	/* top -> top pred */
		956	s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
		957	s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
		958	m = 4 - m;
		959	s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
		960	s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
		961	} else {
		962	mb_type \|= MB_TYPE_16x16;
		963
		964	s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
		965	s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
		966	if (s->picture_structure == PICT_TOP_FIELD)
		967	s->mv[i][2][1]--;
		968	else
		969	s->mv[i][2][1]++;
		970	}
		971	}
		972	}
		973	break;
		974	default:
		975	av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
		976	return -1;
		977	}
		978	}
		979
		980	s->mb_intra = 0;
		981	if (HAS_CBP(mb_type)) {
		982	s->dsp.clear_blocks(s->block[0]);
		983
		984	cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
		985	if (mb_block_count > 6) {
		986	cbp <<= mb_block_count - 6;
		987	cbp \|= get_bits(&s->gb, mb_block_count - 6);
		988	s->dsp.clear_blocks(s->block[6]);
		989	}
		990	if (cbp <= 0) {
		991	av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
		992	return -1;
		993	}
		994
		995	//if 1, we memcpy blocks in xvmcvideo
		996	if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
		997	ff_xvmc_pack_pblocks(s, cbp);
		998	if (s->swap_uv) {
		999	exchange_uv(s);
		1000	}
		1001	}
		1002
		1003	if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
		1004	if (s->flags2 & CODEC_FLAG2_FAST) {
		1005	for (i = 0; i < 6; i++) {
		1006	if (cbp & 32) {
		1007	mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
		1008	} else {
		1009	s->block_last_index[i] = -1;
		1010	}
		1011	cbp += cbp;
		1012	}
		1013	} else {
		1014	cbp <<= 12-mb_block_count;
		1015
		1016	for (i = 0; i < mb_block_count; i++) {
		1017	if (cbp & (1 << 11)) {
		1018	if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
		1019	return -1;
		1020	} else {
		1021	s->block_last_index[i] = -1;
		1022	}
		1023	cbp += cbp;
		1024	}
		1025	}
		1026	} else {
		1027	if (s->flags2 & CODEC_FLAG2_FAST) {
		1028	for (i = 0; i < 6; i++) {
		1029	if (cbp & 32) {
		1030	mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
		1031	} else {
		1032	s->block_last_index[i] = -1;
		1033	}
		1034	cbp += cbp;
		1035	}
		1036	} else {
		1037	for (i = 0; i < 6; i++) {
		1038	if (cbp & 32) {
		1039	if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
		1040	return -1;
		1041	} else {
		1042	s->block_last_index[i] = -1;
		1043	}
		1044	cbp += cbp;
		1045	}
		1046	}
		1047	}
		1048	} else {
		1049	for (i = 0; i < 12; i++)
		1050	s->block_last_index[i] = -1;
		1051	}
		1052	}
		1053
		1054	s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
		1055
		1056	return 0;
		1057	}
		1058
		1059	static av_cold int mpeg_decode_init(AVCodecContext *avctx)
		1060	{
		1061	Mpeg1Context *s = avctx->priv_data;
		1062	MpegEncContext *s2 = &s->mpeg_enc_ctx;
		1063	int i;
		1064
		1065	/* we need some permutation to store matrices,
		1066	* until MPV_common_init() sets the real permutation. */
		1067	for (i = 0; i < 64; i++)
		1068	s2->dsp.idct_permutation[i]=i;
		1069
		1070	ff_MPV_decode_defaults(s2);
		1071
		1072	s->mpeg_enc_ctx.avctx = avctx;
		1073	s->mpeg_enc_ctx.flags = avctx->flags;
		1074	s->mpeg_enc_ctx.flags2 = avctx->flags2;
		1075	ff_mpeg12_common_init(&s->mpeg_enc_ctx);
		1076	ff_mpeg12_init_vlcs();
		1077
		1078	s->mpeg_enc_ctx_allocated = 0;
		1079	s->mpeg_enc_ctx.picture_number = 0;
		1080	s->repeat_field = 0;
		1081	s->mpeg_enc_ctx.codec_id = avctx->codec->id;
		1082	avctx->color_range = AVCOL_RANGE_MPEG;
		1083	if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
		1084	avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
		1085	else
		1086	avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
		1087	return 0;
		1088	}
		1089
		1090	static int mpeg_decode_update_thread_context(AVCodecContext avctx, const AVCodecContext avctx_from)
		1091	{
		1092	Mpeg1Context ctx = avctx->priv_data, ctx_from = avctx_from->priv_data;
		1093	MpegEncContext s = &ctx->mpeg_enc_ctx, s1 = &ctx_from->mpeg_enc_ctx;
		1094	int err;
		1095
		1096	if (avctx == avctx_from \|\| !ctx_from->mpeg_enc_ctx_allocated \|\| !s1->context_initialized)
		1097	return 0;
		1098
		1099	err = ff_mpeg_update_thread_context(avctx, avctx_from);
		1100	if (err) return err;
		1101
		1102	if (!ctx->mpeg_enc_ctx_allocated)
		1103	memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
		1104
		1105	if (!(s->pict_type == AV_PICTURE_TYPE_B \|\| s->low_delay))
		1106	s->picture_number++;
		1107
		1108	return 0;
		1109	}
		1110
		1111	static void quant_matrix_rebuild(uint16_t matrix, const uint8_t old_perm,
		1112	const uint8_t *new_perm)
		1113	{
		1114	uint16_t temp_matrix[64];
		1115	int i;
		1116
		1117	memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
		1118
		1119	for (i = 0; i < 64; i++) {
		1120	matrix[new_perm[i]] = temp_matrix[old_perm[i]];
		1121	}
		1122	}
		1123
		1124	static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
		1125	#if CONFIG_MPEG_XVMC_DECODER
		1126	AV_PIX_FMT_XVMC_MPEG2_IDCT,
		1127	AV_PIX_FMT_XVMC_MPEG2_MC,
		1128	#endif
		1129	#if CONFIG_MPEG1_VDPAU_HWACCEL
		1130	AV_PIX_FMT_VDPAU_MPEG1,
		1131	AV_PIX_FMT_VDPAU,
		1132	#endif
		1133	AV_PIX_FMT_YUV420P,
		1134	AV_PIX_FMT_NONE
		1135	};
		1136
		1137	static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
		1138	#if CONFIG_MPEG_XVMC_DECODER
		1139	AV_PIX_FMT_XVMC_MPEG2_IDCT,
		1140	AV_PIX_FMT_XVMC_MPEG2_MC,
		1141	#endif
		1142	#if CONFIG_MPEG2_VDPAU_HWACCEL
		1143	AV_PIX_FMT_VDPAU_MPEG2,
		1144	AV_PIX_FMT_VDPAU,
		1145	#endif
		1146	#if CONFIG_MPEG2_DXVA2_HWACCEL
		1147	AV_PIX_FMT_DXVA2_VLD,
		1148	#endif
		1149	#if CONFIG_MPEG2_VAAPI_HWACCEL
		1150	AV_PIX_FMT_VAAPI_VLD,
		1151	#endif
		1152	AV_PIX_FMT_YUV420P,
		1153	AV_PIX_FMT_NONE
		1154	};
		1155
		1156	static inline int uses_vdpau(AVCodecContext *avctx) {
		1157	return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 \|\| avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
		1158	}
		1159
		1160	static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
		1161	{
		1162	Mpeg1Context *s1 = avctx->priv_data;
		1163	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1164
		1165	if(s->chroma_format < 2) {
		1166	return ff_thread_get_format(avctx,
		1167	avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
		1168	mpeg1_hwaccel_pixfmt_list_420 :
		1169	mpeg2_hwaccel_pixfmt_list_420);
		1170	} else if(s->chroma_format == 2)
		1171	return AV_PIX_FMT_YUV422P;
		1172	else
		1173	return AV_PIX_FMT_YUV444P;
		1174	}
		1175
		1176	static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
		1177	{
		1178	if (avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_IDCT && avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_MC) {
		1179	avctx->xvmc_acceleration = 0;
		1180	} else if (!avctx->xvmc_acceleration) {
		1181	avctx->xvmc_acceleration = 2;
		1182	}
		1183	avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
		1184	// until then pix_fmt may be changed right after codec init
		1185	if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT \|\|
		1186	avctx->hwaccel \|\| uses_vdpau(avctx))
		1187	if (avctx->idct_algo == FF_IDCT_AUTO)
		1188	avctx->idct_algo = FF_IDCT_SIMPLE;
		1189	}
		1190
		1191	/* Call this function when we know all parameters.
		1192	* It may be called in different places for MPEG-1 and MPEG-2. */
		1193	static int mpeg_decode_postinit(AVCodecContext *avctx)
		1194	{
		1195	Mpeg1Context *s1 = avctx->priv_data;
		1196	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1197	uint8_t old_permutation[64];
		1198
		1199	if ((s1->mpeg_enc_ctx_allocated == 0) \|\|
		1200	avctx->coded_width != s->width \|\|
		1201	avctx->coded_height != s->height \|\|
		1202	s1->save_width != s->width \|\|
		1203	s1->save_height != s->height \|\|
		1204	s1->save_aspect_info != s->aspect_ratio_info \|\|
		1205	(s1->save_progressive_seq != s->progressive_sequence && (s->height&31)) \|\|
		1206	0)
		1207	{
		1208
		1209	if (s1->mpeg_enc_ctx_allocated) {
		1210	ParseContext pc = s->parse_context;
		1211	s->parse_context.buffer = 0;
		1212	ff_MPV_common_end(s);
		1213	s->parse_context = pc;
		1214	s1->mpeg_enc_ctx_allocated = 0;
		1215	}
		1216
		1217	if ((s->width == 0) \|\| (s->height == 0))
		1218	return -2;
		1219
		1220	avcodec_set_dimensions(avctx, s->width, s->height);
		1221	if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
		1222	avctx->rc_max_rate = s->bit_rate;
		1223	} else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
		1224	(s->bit_rate != 0x3FFFF*400 \|\| s->vbv_delay != 0xFFFF)) {
		1225	avctx->bit_rate = s->bit_rate;
		1226	}
		1227	s1->save_aspect_info = s->aspect_ratio_info;
		1228	s1->save_width = s->width;
		1229	s1->save_height = s->height;
		1230	s1->save_progressive_seq = s->progressive_sequence;
		1231
		1232	/* low_delay may be forced, in this case we will have B-frames
		1233	* that behave like P-frames. */
		1234	avctx->has_b_frames = !s->low_delay;
		1235
		1236	if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
		1237	//MPEG-1 fps
		1238	avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
		1239	avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
		1240	//MPEG-1 aspect
		1241	avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
		1242	avctx->ticks_per_frame=1;
		1243	} else {//MPEG-2
		1244	//MPEG-2 fps
		1245	av_reduce(&s->avctx->time_base.den,
		1246	&s->avctx->time_base.num,
		1247	ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
		1248	ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
		1249	1 << 30);
		1250	avctx->ticks_per_frame = 2;
		1251	//MPEG-2 aspect
		1252	if (s->aspect_ratio_info > 1) {
		1253	AVRational dar =
		1254	av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
		1255	(AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
		1256	(AVRational) {s->width, s->height});
		1257
		1258	// we ignore the spec here and guess a bit as reality does not match the spec, see for example
		1259	// res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
		1260	// issue1613, 621, 562
		1261	if ((s1->pan_scan.width == 0) \|\| (s1->pan_scan.height == 0) \|\|
		1262	(av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
		1263	s->avctx->sample_aspect_ratio =
		1264	av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
		1265	(AVRational) {s->width, s->height});
		1266	} else {
		1267	s->avctx->sample_aspect_ratio =
		1268	av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
		1269	(AVRational) {s1->pan_scan.width, s1->pan_scan.height});
		1270	//issue1613 4/3 16/9 -> 16/9
		1271	//res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
		1272	//widescreen-issue562.mpg 4/3 16/9 -> 16/9
		1273	// s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
		1274	av_dlog(avctx, "A %d/%d\n",
		1275	ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
		1276	av_dlog(avctx, "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	avctx->pix_fmt = mpeg_get_pixelformat(avctx);
		1286	setup_hwaccel_for_pixfmt(avctx);
		1287
		1288	/* Quantization matrices may need reordering
		1289	* if DCT permutation is changed. */
		1290	memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
		1291
		1292	if (ff_MPV_common_init(s) < 0)
		1293	return -2;
		1294
		1295	quant_matrix_rebuild(s->intra_matrix, old_permutation, s->dsp.idct_permutation);
		1296	quant_matrix_rebuild(s->inter_matrix, old_permutation, s->dsp.idct_permutation);
		1297	quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
		1298	quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
		1299
		1300	s1->mpeg_enc_ctx_allocated = 1;
		1301	}
		1302	return 0;
		1303	}
		1304
		1305	static int mpeg1_decode_picture(AVCodecContext *avctx,
		1306	const uint8_t *buf, int buf_size)
		1307	{
		1308	Mpeg1Context *s1 = avctx->priv_data;
		1309	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1310	int ref, f_code, vbv_delay;
		1311
		1312	init_get_bits(&s->gb, buf, buf_size*8);
		1313
		1314	ref = get_bits(&s->gb, 10); /* temporal ref */
		1315	s->pict_type = get_bits(&s->gb, 3);
		1316	if (s->pict_type == 0 \|\| s->pict_type > 3)
		1317	return -1;
		1318
		1319	vbv_delay = get_bits(&s->gb, 16);
		1320	s->vbv_delay = vbv_delay;
		1321	if (s->pict_type == AV_PICTURE_TYPE_P \|\| s->pict_type == AV_PICTURE_TYPE_B) {
		1322	s->full_pel[0] = get_bits1(&s->gb);
		1323	f_code = get_bits(&s->gb, 3);
		1324	if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM\|AV_EF_COMPLIANT)))
		1325	return -1;
		1326	f_code += !f_code;
		1327	s->mpeg_f_code[0][0] = f_code;
		1328	s->mpeg_f_code[0][1] = f_code;
		1329	}
		1330	if (s->pict_type == AV_PICTURE_TYPE_B) {
		1331	s->full_pel[1] = get_bits1(&s->gb);
		1332	f_code = get_bits(&s->gb, 3);
		1333	if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM\|AV_EF_COMPLIANT)))
		1334	return -1;
		1335	f_code += !f_code;
		1336	s->mpeg_f_code[1][0] = f_code;
		1337	s->mpeg_f_code[1][1] = f_code;
		1338	}
		1339	s->current_picture.f.pict_type = s->pict_type;
		1340	s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
		1341
		1342	if (avctx->debug & FF_DEBUG_PICT_INFO)
		1343	av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
		1344
		1345	s->y_dc_scale = 8;
		1346	s->c_dc_scale = 8;
		1347	return 0;
		1348	}
		1349
		1350	static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
		1351	{
		1352	MpegEncContext *s= &s1->mpeg_enc_ctx;
		1353	int horiz_size_ext, vert_size_ext;
		1354	int bit_rate_ext;
		1355
		1356	skip_bits(&s->gb, 1); /* profile and level esc*/
		1357	s->avctx->profile = get_bits(&s->gb, 3);
		1358	s->avctx->level = get_bits(&s->gb, 4);
		1359	s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
		1360	s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
		1361	horiz_size_ext = get_bits(&s->gb, 2);
		1362	vert_size_ext = get_bits(&s->gb, 2);
		1363	s->width \|= (horiz_size_ext << 12);
		1364	s->height \|= (vert_size_ext << 12);
		1365	bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
		1366	s->bit_rate += (bit_rate_ext << 18) * 400;
		1367	skip_bits1(&s->gb); /* marker */
		1368	s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
		1369
		1370	s->low_delay = get_bits1(&s->gb);
		1371	if (s->flags & CODEC_FLAG_LOW_DELAY)
		1372	s->low_delay = 1;
		1373
		1374	s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
		1375	s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
		1376
		1377	av_dlog(s->avctx, "sequence extension\n");
		1378	s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
		1379
		1380	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
		1381	av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
		1382	s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format, s->avctx->rc_buffer_size, s->bit_rate);
		1383
		1384	}
		1385
		1386	static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
		1387	{
		1388	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1389	int color_description, w, h;
		1390
		1391	skip_bits(&s->gb, 3); /* video format */
		1392	color_description = get_bits1(&s->gb);
		1393	if (color_description) {
		1394	s->avctx->color_primaries = get_bits(&s->gb, 8);
		1395	s->avctx->color_trc = get_bits(&s->gb, 8);
		1396	s->avctx->colorspace = get_bits(&s->gb, 8);
		1397	}
		1398	w = get_bits(&s->gb, 14);
		1399	skip_bits(&s->gb, 1); //marker
		1400	h = get_bits(&s->gb, 14);
		1401	// remaining 3 bits are zero padding
		1402
		1403	s1->pan_scan.width = 16 * w;
		1404	s1->pan_scan.height = 16 * h;
		1405
		1406	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
		1407	av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
		1408	}
		1409
		1410	static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
		1411	{
		1412	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1413	int i, nofco;
		1414
		1415	nofco = 1;
		1416	if (s->progressive_sequence) {
		1417	if (s->repeat_first_field) {
		1418	nofco++;
		1419	if (s->top_field_first)
		1420	nofco++;
		1421	}
		1422	} else {
		1423	if (s->picture_structure == PICT_FRAME) {
		1424	nofco++;
		1425	if (s->repeat_first_field)
		1426	nofco++;
		1427	}
		1428	}
		1429	for (i = 0; i < nofco; i++) {
		1430	s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
		1431	skip_bits(&s->gb, 1); // marker
		1432	s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
		1433	skip_bits(&s->gb, 1); // marker
		1434	}
		1435
		1436	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
		1437	av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
		1438	s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
		1439	s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
		1440	s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
		1441	}
		1442
		1443	static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
		1444	{
		1445	int i;
		1446
		1447	for (i = 0; i < 64; i++) {
		1448	int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
		1449	int v = get_bits(&s->gb, 8);
		1450	if (v == 0) {
		1451	av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
		1452	return -1;
		1453	}
		1454	if (intra && i == 0 && v != 8) {
		1455	av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
		1456	v = 8; // needed by pink.mpg / issue1046
		1457	}
		1458	matrix0[j] = v;
		1459	if (matrix1)
		1460	matrix1[j] = v;
		1461	}
		1462	return 0;
		1463	}
		1464
		1465	static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
		1466	{
		1467	av_dlog(s->avctx, "matrix extension\n");
		1468
		1469	if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
		1470	if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
		1471	if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
		1472	if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
		1473	}
		1474
		1475	static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
		1476	{
		1477	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1478
		1479	s->full_pel[0] = s->full_pel[1] = 0;
		1480	s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
		1481	s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
		1482	s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
		1483	s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
		1484	if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
		1485	av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
		1486	if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
		1487	if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
		1488	s->pict_type = AV_PICTURE_TYPE_I;
		1489	else
		1490	s->pict_type = AV_PICTURE_TYPE_P;
		1491	} else
		1492	s->pict_type = AV_PICTURE_TYPE_B;
		1493	s->current_picture.f.pict_type = s->pict_type;
		1494	s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
		1495	}
		1496	s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
		1497	s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
		1498	s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
		1499	s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
		1500
		1501	s->intra_dc_precision = get_bits(&s->gb, 2);
		1502	s->picture_structure = get_bits(&s->gb, 2);
		1503	s->top_field_first = get_bits1(&s->gb);
		1504	s->frame_pred_frame_dct = get_bits1(&s->gb);
		1505	s->concealment_motion_vectors = get_bits1(&s->gb);
		1506	s->q_scale_type = get_bits1(&s->gb);
		1507	s->intra_vlc_format = get_bits1(&s->gb);
		1508	s->alternate_scan = get_bits1(&s->gb);
		1509	s->repeat_first_field = get_bits1(&s->gb);
		1510	s->chroma_420_type = get_bits1(&s->gb);
		1511	s->progressive_frame = get_bits1(&s->gb);
		1512
		1513
		1514	if (s->alternate_scan) {
		1515	ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
		1516	ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
		1517	} else {
		1518	ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
		1519	ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
		1520	}
		1521
		1522	/* composite display not parsed */
		1523	av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
		1524	av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
		1525	av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
		1526	av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
		1527	av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
		1528	av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
		1529	av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
		1530	av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
		1531	av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
		1532	}
		1533
		1534	static int mpeg_field_start(MpegEncContext s, const uint8_t buf, int buf_size)
		1535	{
		1536	AVCodecContext *avctx = s->avctx;
		1537	Mpeg1Context s1 = (Mpeg1Context)s;
		1538
		1539	/* start frame decoding */
		1540	if (s->first_field \|\| s->picture_structure == PICT_FRAME) {
		1541	AVFrameSideData *pan_scan;
		1542
		1543	if (ff_MPV_frame_start(s, avctx) < 0)
		1544	return -1;
		1545
		1546	ff_mpeg_er_frame_start(s);
		1547
		1548	/* first check if we must repeat the frame */
		1549	s->current_picture_ptr->f.repeat_pict = 0;
		1550	if (s->repeat_first_field) {
		1551	if (s->progressive_sequence) {
		1552	if (s->top_field_first)
		1553	s->current_picture_ptr->f.repeat_pict = 4;
		1554	else
		1555	s->current_picture_ptr->f.repeat_pict = 2;
		1556	} else if (s->progressive_frame) {
		1557	s->current_picture_ptr->f.repeat_pict = 1;
		1558	}
		1559	}
		1560
		1561	pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
		1562	AV_FRAME_DATA_PANSCAN,
		1563	sizeof(s1->pan_scan));
		1564	if (!pan_scan)
		1565	return AVERROR(ENOMEM);
		1566	memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
		1567
		1568	if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
		1569	ff_thread_finish_setup(avctx);
		1570	} else { // second field
		1571	int i;
		1572
		1573	if (!s->current_picture_ptr) {
		1574	av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
		1575	return -1;
		1576	}
		1577
		1578	if (s->avctx->hwaccel &&
		1579	(s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
		1580	if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
		1581	av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n");
		1582	}
		1583
		1584	for (i = 0; i < 4; i++) {
		1585	s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
		1586	if (s->picture_structure == PICT_BOTTOM_FIELD) {
		1587	s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
		1588	}
		1589	}
		1590	}
		1591
		1592	if (avctx->hwaccel) {
		1593	if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
		1594	return -1;
		1595	}
		1596
		1597	// MPV_frame_start will call this function too,
		1598	// but we need to call it on every field
		1599	if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
		1600	if (ff_xvmc_field_start(s, avctx) < 0)
		1601	return -1;
		1602
		1603	return 0;
		1604	}
		1605
		1606	#define DECODE_SLICE_ERROR -1
		1607	#define DECODE_SLICE_OK 0
		1608
		1609	/**
		1610	* Decode a slice.
		1611	* MpegEncContext.mb_y must be set to the MB row from the startcode.
		1612	* @return DECODE_SLICE_ERROR if the slice is damaged,
		1613	* DECODE_SLICE_OK if this slice is OK
		1614	*/
		1615	static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
		1616	const uint8_t **buf, int buf_size)
		1617	{
		1618	AVCodecContext *avctx = s->avctx;
		1619	const int lowres = s->avctx->lowres;
		1620	const int field_pic = s->picture_structure != PICT_FRAME;
		1621
		1622	s->resync_mb_x =
		1623	s->resync_mb_y = -1;
		1624
		1625	av_assert0(mb_y < s->mb_height);
		1626
		1627	init_get_bits(&s->gb, buf, buf_size 8);
		1628	if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
		1629	skip_bits(&s->gb, 3);
		1630
		1631	ff_mpeg1_clean_buffers(s);
		1632	s->interlaced_dct = 0;
		1633
		1634	s->qscale = get_qscale(s);
		1635
		1636	if (s->qscale == 0) {
		1637	av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
		1638	return -1;
		1639	}
		1640
		1641	/* extra slice info */
		1642	while (get_bits1(&s->gb) != 0) {
		1643	skip_bits(&s->gb, 8);
		1644	}
		1645
		1646	s->mb_x = 0;
		1647
		1648	if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
		1649	skip_bits1(&s->gb);
		1650	} else {
		1651	while (get_bits_left(&s->gb) > 0) {
		1652	int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
		1653	MBINCR_VLC_BITS, 2);
		1654	if (code < 0) {
		1655	av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
		1656	return -1;
		1657	}
		1658	if (code >= 33) {
		1659	if (code == 33) {
		1660	s->mb_x += 33;
		1661	}
		1662	/* otherwise, stuffing, nothing to do */
		1663	} else {
		1664	s->mb_x += code;
		1665	break;
		1666	}
		1667	}
		1668	}
		1669
		1670	if (s->mb_x >= (unsigned)s->mb_width) {
		1671	av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
		1672	return -1;
		1673	}
		1674
		1675	if (avctx->hwaccel) {
		1676	const uint8_t buf_end, buf_start = buf - 4; / include start_code */
		1677	int start_code = -1;
		1678	buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
		1679	if (buf_end < *buf + buf_size)
		1680	buf_end -= 4;
		1681	s->mb_y = mb_y;
		1682	if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
		1683	return DECODE_SLICE_ERROR;
		1684	*buf = buf_end;
		1685	return DECODE_SLICE_OK;
		1686	}
		1687
		1688	s->resync_mb_x = s->mb_x;
		1689	s->resync_mb_y = s->mb_y = mb_y;
		1690	s->mb_skip_run = 0;
		1691	ff_init_block_index(s);
		1692
		1693	if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field \|\| s->picture_structure == PICT_FRAME)) {
		1694	if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
		1695	av_log(s->avctx, AV_LOG_DEBUG, "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",
		1696	s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
		1697	s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
		1698	s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
		1699	s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
		1700	s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
		1701	}
		1702	}
		1703
		1704	for (;;) {
		1705	// If 1, we memcpy blocks in xvmcvideo.
		1706	if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
		1707	ff_xvmc_init_block(s); // set s->block
		1708
		1709	if (mpeg_decode_mb(s, s->block) < 0)
		1710	return -1;
		1711
		1712	if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
		1713	const int wrap = s->b8_stride;
		1714	int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
		1715	int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
		1716	int motion_x, motion_y, dir, i;
		1717
		1718	for (i = 0; i < 2; i++) {
		1719	for (dir = 0; dir < 2; dir++) {
		1720	if (s->mb_intra \|\| (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
		1721	motion_x = motion_y = 0;
		1722	} else if (s->mv_type == MV_TYPE_16X16 \|\| (s->mv_type == MV_TYPE_FIELD && field_pic)) {
		1723	motion_x = s->mv[dir][0][0];
		1724	motion_y = s->mv[dir][0][1];
		1725	} else /if ((s->mv_type == MV_TYPE_FIELD) \|\| (s->mv_type == MV_TYPE_16X8))/ {
		1726	motion_x = s->mv[dir][i][0];
		1727	motion_y = s->mv[dir][i][1];
		1728	}
		1729
		1730	s->current_picture.motion_val[dir][xy ][0] = motion_x;
		1731	s->current_picture.motion_val[dir][xy ][1] = motion_y;
		1732	s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
		1733	s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
		1734	s->current_picture.ref_index [dir][b8_xy ] =
		1735	s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
		1736	av_assert2(s->field_select[dir][i] == 0 \|\| s->field_select[dir][i] == 1);
		1737	}
		1738	xy += wrap;
		1739	b8_xy +=2;
		1740	}
		1741	}
		1742
		1743	s->dest[0] += 16 >> lowres;
		1744	s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
		1745	s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
		1746
		1747	ff_MPV_decode_mb(s, s->block);
		1748
		1749	if (++s->mb_x >= s->mb_width) {
		1750	const int mb_size = 16 >> s->avctx->lowres;
		1751
		1752	ff_mpeg_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
		1753	ff_MPV_report_decode_progress(s);
		1754
		1755	s->mb_x = 0;
		1756	s->mb_y += 1 << field_pic;
		1757
		1758	if (s->mb_y >= s->mb_height) {
		1759	int left = get_bits_left(&s->gb);
		1760	int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5
		1761	&& s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
		1762	&& s->progressive_frame == 0 /* vbv_delay == 0xBBB \|\| 0xE10*/;
		1763
		1764	if (left >= 32 && !is_d10) {
		1765	GetBitContext gb = s->gb;
		1766	align_get_bits(&gb);
		1767	if (show_bits(&gb, 24) == 0x060E2B) {
		1768	av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
		1769	is_d10 = 1;
		1770	}
		1771	}
		1772
		1773	if (left < 0 \|\| (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
		1774	\|\| ((avctx->err_recognition & (AV_EF_BITSTREAM \| AV_EF_AGGRESSIVE)) && left > 8)) {
		1775	av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
		1776	return -1;
		1777	} else
		1778	goto eos;
		1779	}
		1780
		1781	ff_init_block_index(s);
		1782	}
		1783
		1784	/* skip mb handling */
		1785	if (s->mb_skip_run == -1) {
		1786	/* read increment again */
		1787	s->mb_skip_run = 0;
		1788	for (;;) {
		1789	int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
		1790	MBINCR_VLC_BITS, 2);
		1791	if (code < 0) {
		1792	av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
		1793	return -1;
		1794	}
		1795	if (code >= 33) {
		1796	if (code == 33) {
		1797	s->mb_skip_run += 33;
		1798	} else if (code == 35) {
		1799	if (s->mb_skip_run != 0 \|\| show_bits(&s->gb, 15) != 0) {
		1800	av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
		1801	return -1;
		1802	}
		1803	goto eos; /* end of slice */
		1804	}
		1805	/* otherwise, stuffing, nothing to do */
		1806	} else {
		1807	s->mb_skip_run += code;
		1808	break;
		1809	}
		1810	}
		1811	if (s->mb_skip_run) {
		1812	int i;
		1813	if (s->pict_type == AV_PICTURE_TYPE_I) {
		1814	av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
		1815	return -1;
		1816	}
		1817
		1818	/* skip mb */
		1819	s->mb_intra = 0;
		1820	for (i = 0; i < 12; i++)
		1821	s->block_last_index[i] = -1;
		1822	if (s->picture_structure == PICT_FRAME)
		1823	s->mv_type = MV_TYPE_16X16;
		1824	else
		1825	s->mv_type = MV_TYPE_FIELD;
		1826	if (s->pict_type == AV_PICTURE_TYPE_P) {
		1827	/* if P type, zero motion vector is implied */
		1828	s->mv_dir = MV_DIR_FORWARD;
		1829	s->mv[0][0][0] = s->mv[0][0][1] = 0;
		1830	s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
		1831	s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
		1832	s->field_select[0][0] = (s->picture_structure - 1) & 1;
		1833	} else {
		1834	/* if B type, reuse previous vectors and directions */
		1835	s->mv[0][0][0] = s->last_mv[0][0][0];
		1836	s->mv[0][0][1] = s->last_mv[0][0][1];
		1837	s->mv[1][0][0] = s->last_mv[1][0][0];
		1838	s->mv[1][0][1] = s->last_mv[1][0][1];
		1839	}
		1840	}
		1841	}
		1842	}
		1843	eos: // end of slice
		1844	*buf += (get_bits_count(&s->gb)-1)/8;
		1845	av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
		1846	return 0;
		1847	}
		1848
		1849	static int slice_decode_thread(AVCodecContext c, void arg)
		1850	{
		1851	MpegEncContext s = (void**)arg;
		1852	const uint8_t *buf = s->gb.buffer;
		1853	int mb_y = s->start_mb_y;
		1854	const int field_pic = s->picture_structure != PICT_FRAME;
		1855
		1856	s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
		1857
		1858	for (;;) {
		1859	uint32_t start_code;
		1860	int ret;
		1861
		1862	ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
		1863	emms_c();
		1864	av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
		1865	ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
		1866	s->start_mb_y, s->end_mb_y, s->er.error_count);
		1867	if (ret < 0) {
		1868	if (c->err_recognition & AV_EF_EXPLODE)
		1869	return ret;
		1870	if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
		1871	ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR \| ER_DC_ERROR \| ER_MV_ERROR);
		1872	} else {
		1873	ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END \| ER_DC_END \| ER_MV_END);
		1874	}
		1875
		1876	if (s->mb_y == s->end_mb_y)
		1877	return 0;
		1878
		1879	start_code = -1;
		1880	buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
		1881	mb_y= start_code - SLICE_MIN_START_CODE;
		1882	if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
		1883	mb_y += (*buf&0xE0)<<2;
		1884	mb_y <<= field_pic;
		1885	if (s->picture_structure == PICT_BOTTOM_FIELD)
		1886	mb_y++;
		1887	if (mb_y < 0 \|\| mb_y >= s->end_mb_y)
		1888	return -1;
		1889	}
		1890	}
		1891
		1892	/**
		1893	* Handle slice ends.
		1894	* @return 1 if it seems to be the last slice
		1895	*/
		1896	static int slice_end(AVCodecContext avctx, AVFrame pict)
		1897	{
		1898	Mpeg1Context *s1 = avctx->priv_data;
		1899	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1900
		1901	if (!s1->mpeg_enc_ctx_allocated \|\| !s->current_picture_ptr)
		1902	return 0;
		1903
		1904	if (s->avctx->hwaccel) {
		1905	if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
		1906	av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
		1907	}
		1908
		1909	if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
		1910	ff_xvmc_field_end(s);
		1911
		1912	/* end of slice reached */
		1913	if (/s->mb_y << field_pic == s->mb_height &&/ !s->first_field && !s->first_slice) {
		1914	/* end of image */
		1915
		1916	ff_er_frame_end(&s->er);
		1917
		1918	ff_MPV_frame_end(s);
		1919
		1920	if (s->pict_type == AV_PICTURE_TYPE_B \|\| s->low_delay) {
		1921	int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
		1922	if (ret < 0)
		1923	return ret;
		1924	ff_print_debug_info(s, s->current_picture_ptr, pict);
		1925	ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
		1926	} else {
		1927	if (avctx->active_thread_type & FF_THREAD_FRAME)
		1928	s->picture_number++;
		1929	/* latency of 1 frame for I- and P-frames */
		1930	/* XXX: use another variable than picture_number */
		1931	if (s->last_picture_ptr != NULL) {
		1932	int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
		1933	if (ret < 0)
		1934	return ret;
		1935	ff_print_debug_info(s, s->last_picture_ptr, pict);
		1936	ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
		1937	}
		1938	}
		1939
		1940	return 1;
		1941	} else {
		1942	return 0;
		1943	}
		1944	}
		1945
		1946	static int mpeg1_decode_sequence(AVCodecContext *avctx,
		1947	const uint8_t *buf, int buf_size)
		1948	{
		1949	Mpeg1Context *s1 = avctx->priv_data;
		1950	MpegEncContext *s = &s1->mpeg_enc_ctx;
		1951	int width, height;
		1952	int i, v, j;
		1953
		1954	init_get_bits(&s->gb, buf, buf_size*8);
		1955
		1956	width = get_bits(&s->gb, 12);
		1957	height = get_bits(&s->gb, 12);
		1958	if (width == 0 \|\| height == 0) {
		1959	av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
		1960	"value.\n");
		1961	if (avctx->err_recognition & (AV_EF_BITSTREAM \| AV_EF_COMPLIANT))
		1962	return AVERROR_INVALIDDATA;
		1963	}
		1964	s->aspect_ratio_info = get_bits(&s->gb, 4);
		1965	if (s->aspect_ratio_info == 0) {
		1966	av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
		1967	if (avctx->err_recognition & (AV_EF_BITSTREAM \| AV_EF_COMPLIANT))
		1968	return -1;
		1969	}
		1970	s->frame_rate_index = get_bits(&s->gb, 4);
		1971	if (s->frame_rate_index == 0 \|\| s->frame_rate_index > 13)
		1972	return -1;
		1973	s->bit_rate = get_bits(&s->gb, 18) * 400;
		1974	if (get_bits1(&s->gb) == 0) /* marker */
		1975	return -1;
		1976	s->width = width;
		1977	s->height = height;
		1978
		1979	s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
		1980	skip_bits(&s->gb, 1);
		1981
		1982	/* get matrix */
		1983	if (get_bits1(&s->gb)) {
		1984	load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
		1985	} else {
		1986	for (i = 0; i < 64; i++) {
		1987	j = s->dsp.idct_permutation[i];
		1988	v = ff_mpeg1_default_intra_matrix[i];
		1989	s->intra_matrix[j] = v;
		1990	s->chroma_intra_matrix[j] = v;
		1991	}
		1992	}
		1993	if (get_bits1(&s->gb)) {
		1994	load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
		1995	} else {
		1996	for (i = 0; i < 64; i++) {
		1997	int j = s->dsp.idct_permutation[i];
		1998	v = ff_mpeg1_default_non_intra_matrix[i];
		1999	s->inter_matrix[j] = v;
		2000	s->chroma_inter_matrix[j] = v;
		2001	}
		2002	}
		2003
		2004	if (show_bits(&s->gb, 23) != 0) {
		2005	av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
		2006	return -1;
		2007	}
		2008
		2009	/* we set MPEG-2 parameters so that it emulates MPEG-1 */
		2010	s->progressive_sequence = 1;
		2011	s->progressive_frame = 1;
		2012	s->picture_structure = PICT_FRAME;
		2013	s->first_field = 0;
		2014	s->frame_pred_frame_dct = 1;
		2015	s->chroma_format = 1;
		2016	s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
		2017	s->out_format = FMT_MPEG1;
		2018	s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
		2019	if (s->flags & CODEC_FLAG_LOW_DELAY)
		2020	s->low_delay = 1;
		2021
		2022	if (s->avctx->debug & FF_DEBUG_PICT_INFO)
		2023	av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
		2024	s->avctx->rc_buffer_size, s->bit_rate);
		2025
		2026	return 0;
		2027	}
		2028
		2029	static int vcr2_init_sequence(AVCodecContext *avctx)
		2030	{
		2031	Mpeg1Context *s1 = avctx->priv_data;
		2032	MpegEncContext *s = &s1->mpeg_enc_ctx;
		2033	int i, v;
		2034
		2035	/* start new MPEG-1 context decoding */
		2036	s->out_format = FMT_MPEG1;
		2037	if (s1->mpeg_enc_ctx_allocated) {
		2038	ff_MPV_common_end(s);
		2039	s1->mpeg_enc_ctx_allocated = 0;
		2040	}
		2041	s->width = avctx->coded_width;
		2042	s->height = avctx->coded_height;
		2043	avctx->has_b_frames = 0; // true?
		2044	s->low_delay = 1;
		2045
		2046	avctx->pix_fmt = mpeg_get_pixelformat(avctx);
		2047	setup_hwaccel_for_pixfmt(avctx);
		2048
		2049	if (ff_MPV_common_init(s) < 0)
		2050	return -1;
		2051	s1->mpeg_enc_ctx_allocated = 1;
		2052
		2053	for (i = 0; i < 64; i++) {
		2054	int j = s->dsp.idct_permutation[i];
		2055	v = ff_mpeg1_default_intra_matrix[i];
		2056	s->intra_matrix[j] = v;
		2057	s->chroma_intra_matrix[j] = v;
		2058
		2059	v = ff_mpeg1_default_non_intra_matrix[i];
		2060	s->inter_matrix[j] = v;
		2061	s->chroma_inter_matrix[j] = v;
		2062	}
		2063
		2064	s->progressive_sequence = 1;
		2065	s->progressive_frame = 1;
		2066	s->picture_structure = PICT_FRAME;
		2067	s->first_field = 0;
		2068	s->frame_pred_frame_dct = 1;
		2069	s->chroma_format = 1;
		2070	if (s->codec_tag == AV_RL32("BW10")) {
		2071	s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
		2072	} else {
		2073	s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
		2074	s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
		2075	}
		2076	s1->save_width = s->width;
		2077	s1->save_height = s->height;
		2078	s1->save_progressive_seq = s->progressive_sequence;
		2079	return 0;
		2080	}
		2081
		2082
		2083	static void mpeg_decode_user_data(AVCodecContext *avctx,
		2084	const uint8_t *p, int buf_size)
		2085	{
		2086	Mpeg1Context *s = avctx->priv_data;
		2087	const uint8_t *buf_end = p + buf_size;
		2088
		2089	if(buf_size > 29){
		2090	int i;
		2091	for(i=0; i<20; i++)
		2092	if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
		2093	s->tmpgexs= 1;
		2094	}
		2095
		2096	/* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i
		2097	av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
		2098	}
		2099	av_log(avctx, AV_LOG_ERROR, "\n");*/
		2100	}
		2101
		2102	/* we parse the DTG active format information */
		2103	if (buf_end - p >= 5 &&
		2104	p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
		2105	int flags = p[4];
		2106	p += 5;
		2107	if (flags & 0x80) {
		2108	/* skip event id */
		2109	p += 2;
		2110	}
		2111	if (flags & 0x40) {
		2112	if (buf_end - p < 1)
		2113	return;
		2114	avctx->dtg_active_format = p[0] & 0x0f;
		2115	}
		2116	}
		2117	}
		2118
		2119	static void mpeg_decode_gop(AVCodecContext *avctx,
		2120	const uint8_t *buf, int buf_size)
		2121	{
		2122	Mpeg1Context *s1 = avctx->priv_data;
		2123	MpegEncContext *s = &s1->mpeg_enc_ctx;
		2124	int broken_link;
		2125	int64_t tc;
		2126
		2127	init_get_bits(&s->gb, buf, buf_size*8);
		2128
		2129	tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
		2130
		2131	s->closed_gop = get_bits1(&s->gb);
		2132	/*broken_link indicate that after editing the
		2133	reference frames of the first B-Frames after GOP I-Frame
		2134	are missing (open gop)*/
		2135	broken_link = get_bits1(&s->gb);
		2136
		2137	if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
		2138	char tcbuf[AV_TIMECODE_STR_SIZE];
		2139	av_timecode_make_mpeg_tc_string(tcbuf, tc);
		2140	av_log(s->avctx, AV_LOG_DEBUG,
		2141	"GOP (%s) closed_gop=%d broken_link=%d\n",
		2142	tcbuf, s->closed_gop, broken_link);
		2143	}
		2144	}
		2145
		2146	static int decode_chunks(AVCodecContext *avctx,
		2147	AVFrame picture, int got_output,
		2148	const uint8_t *buf, int buf_size)
		2149	{
		2150	Mpeg1Context *s = avctx->priv_data;
		2151	MpegEncContext *s2 = &s->mpeg_enc_ctx;
		2152	const uint8_t *buf_ptr = buf;
		2153	const uint8_t *buf_end = buf + buf_size;
		2154	int ret, input_size;
		2155	int last_code = 0, skip_frame = 0;
		2156	int picture_start_code_seen = 0;
		2157
		2158	for (;;) {
		2159	/* find next start code */
		2160	uint32_t start_code = -1;
		2161	buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
		2162	if (start_code > 0x1ff) {
		2163	if (!skip_frame) {
		2164	if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
		2165	!avctx->hwaccel) {
		2166	int i;
		2167	av_assert0(avctx->thread_count > 1);
		2168
		2169	avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
		2170	for (i = 0; i < s->slice_count; i++)
		2171	s2->er.error_count += s2->thread_context[i]->er.error_count;
		2172	}
		2173
		2174	if ((CONFIG_MPEG_VDPAU_DECODER \|\| CONFIG_MPEG1_VDPAU_DECODER)
		2175	&& uses_vdpau(avctx))
		2176	ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
		2177
		2178	ret = slice_end(avctx, picture);
		2179	if (ret < 0)
		2180	return ret;
		2181	else if (ret) {
		2182	if (s2->last_picture_ptr \|\| s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
		2183	*got_output = 1;
		2184	}
		2185	}
		2186	s2->pict_type = 0;
		2187	return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
		2188	}
		2189
		2190	input_size = buf_end - buf_ptr;
		2191
		2192	if (avctx->debug & FF_DEBUG_STARTCODE) {
		2193	av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
		2194	}
		2195
		2196	/* prepare data for next start code */
		2197	switch (start_code) {
		2198	case SEQ_START_CODE:
		2199	if (last_code == 0) {
		2200	mpeg1_decode_sequence(avctx, buf_ptr, input_size);
		2201	if(buf != avctx->extradata)
		2202	s->sync=1;
		2203	} else {
		2204	av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
		2205	if (avctx->err_recognition & AV_EF_EXPLODE)
		2206	return AVERROR_INVALIDDATA;
		2207	}
		2208	break;
		2209
		2210	case PICTURE_START_CODE:
		2211	if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
		2212	/* If it's a frame picture, there can't be more than one picture header.
		2213	Yet, it does happen and we need to handle it. */
		2214	av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
		2215	break;
		2216	}
		2217	picture_start_code_seen = 1;
		2218
		2219	if (s2->width <= 0 \|\| s2->height <= 0) {
		2220	av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
		2221	s2->width, s2->height);
		2222	return AVERROR_INVALIDDATA;
		2223	}
		2224
		2225	if(s->tmpgexs){
		2226	s2->intra_dc_precision= 3;
		2227	s2->intra_matrix[0]= 1;
		2228	}
		2229	if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
		2230	!avctx->hwaccel && s->slice_count) {
		2231	int i;
		2232
		2233	avctx->execute(avctx, slice_decode_thread,
		2234	s2->thread_context, NULL,
		2235	s->slice_count, sizeof(void*));
		2236	for (i = 0; i < s->slice_count; i++)
		2237	s2->er.error_count += s2->thread_context[i]->er.error_count;
		2238	s->slice_count = 0;
		2239	}
		2240	if (last_code == 0 \|\| last_code == SLICE_MIN_START_CODE) {
		2241	ret = mpeg_decode_postinit(avctx);
		2242	if (ret < 0) {
		2243	av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
		2244	return ret;
		2245	}
		2246
		2247	/* we have a complete image: we try to decompress it */
		2248	if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
		2249	s2->pict_type = 0;
		2250	s2->first_slice = 1;
		2251	last_code = PICTURE_START_CODE;
		2252	} else {
		2253	av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
		2254	if (avctx->err_recognition & AV_EF_EXPLODE)
		2255	return AVERROR_INVALIDDATA;
		2256	}
		2257	break;
		2258	case EXT_START_CODE:
		2259	init_get_bits(&s2->gb, buf_ptr, input_size*8);
		2260
		2261	switch (get_bits(&s2->gb, 4)) {
		2262	case 0x1:
		2263	if (last_code == 0) {
		2264	mpeg_decode_sequence_extension(s);
		2265	} else {
		2266	av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
		2267	if (avctx->err_recognition & AV_EF_EXPLODE)
		2268	return AVERROR_INVALIDDATA;
		2269	}
		2270	break;
		2271	case 0x2:
		2272	mpeg_decode_sequence_display_extension(s);
		2273	break;
		2274	case 0x3:
		2275	mpeg_decode_quant_matrix_extension(s2);
		2276	break;
		2277	case 0x7:
		2278	mpeg_decode_picture_display_extension(s);
		2279	break;
		2280	case 0x8:
		2281	if (last_code == PICTURE_START_CODE) {
		2282	mpeg_decode_picture_coding_extension(s);
		2283	} else {
		2284	av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
		2285	if (avctx->err_recognition & AV_EF_EXPLODE)
		2286	return AVERROR_INVALIDDATA;
		2287	}
		2288	break;
		2289	}
		2290	break;
		2291	case USER_START_CODE:
		2292	mpeg_decode_user_data(avctx, buf_ptr, input_size);
		2293	break;
		2294	case GOP_START_CODE:
		2295	if (last_code == 0) {
		2296	s2->first_field=0;
		2297	mpeg_decode_gop(avctx, buf_ptr, input_size);
		2298	s->sync=1;
		2299	} else {
		2300	av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
		2301	if (avctx->err_recognition & AV_EF_EXPLODE)
		2302	return AVERROR_INVALIDDATA;
		2303	}
		2304	break;
		2305	default:
		2306	if (start_code >= SLICE_MIN_START_CODE &&
		2307	start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
		2308
		2309	if (s2->progressive_sequence && !s2->progressive_frame) {
		2310	s2->progressive_frame = 1;
		2311	av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
		2312	}
		2313
		2314	if (s2->picture_structure == 0 \|\| (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
		2315	av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
		2316	s2->picture_structure = PICT_FRAME;
		2317	}
		2318
		2319	if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
		2320	av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
		2321	}
		2322
		2323	if (s2->picture_structure == PICT_FRAME) {
		2324	s2->first_field = 0;
		2325	s2->v_edge_pos = 16 * s2->mb_height;
		2326	} else {
		2327	s2->first_field ^= 1;
		2328	s2->v_edge_pos = 8 * s2->mb_height;
		2329	memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
		2330	}
		2331	}
		2332	if (start_code >= SLICE_MIN_START_CODE &&
		2333	start_code <= SLICE_MAX_START_CODE && last_code != 0) {
		2334	const int field_pic = s2->picture_structure != PICT_FRAME;
		2335	int mb_y = start_code - SLICE_MIN_START_CODE;
		2336	last_code = SLICE_MIN_START_CODE;
		2337	if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
		2338	mb_y += (*buf_ptr&0xE0)<<2;
		2339
		2340	mb_y <<= field_pic;
		2341	if (s2->picture_structure == PICT_BOTTOM_FIELD)
		2342	mb_y++;
		2343
		2344	if (buf_end - buf_ptr < 2) {
		2345	av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
		2346	return AVERROR_INVALIDDATA;
		2347	}
		2348
		2349	if (mb_y >= s2->mb_height) {
		2350	av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
		2351	return -1;
		2352	}
		2353
		2354	if (s2->last_picture_ptr == NULL) {
		2355	/* Skip B-frames if we do not have reference frames and gop is not closed */
		2356	if (s2->pict_type == AV_PICTURE_TYPE_B) {
		2357	if (!s2->closed_gop) {
		2358	skip_frame = 1;
		2359	break;
		2360	}
		2361	}
		2362	}
		2363	if (s2->pict_type == AV_PICTURE_TYPE_I \|\| (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
		2364	s->sync=1;
		2365	if (s2->next_picture_ptr == NULL) {
		2366	/* Skip P-frames if we do not have a reference frame or we have an invalid header. */
		2367	if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
		2368	skip_frame = 1;
		2369	break;
		2370	}
		2371	}
		2372	if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) \|\|
		2373	(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) \|\|
		2374	avctx->skip_frame >= AVDISCARD_ALL) {
		2375	skip_frame = 1;
		2376	break;
		2377	}
		2378
		2379	if (!s->mpeg_enc_ctx_allocated)
		2380	break;
		2381
		2382	if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
		2383	if (mb_y < avctx->skip_top \|\| mb_y >= s2->mb_height - avctx->skip_bottom)
		2384	break;
		2385	}
		2386
		2387	if (!s2->pict_type) {
		2388	av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
		2389	if (avctx->err_recognition & AV_EF_EXPLODE)
		2390	return AVERROR_INVALIDDATA;
		2391	break;
		2392	}
		2393
		2394	if (s2->first_slice) {
		2395	skip_frame = 0;
		2396	s2->first_slice = 0;
		2397	if (mpeg_field_start(s2, buf, buf_size) < 0)
		2398	return -1;
		2399	}
		2400	if (!s2->current_picture_ptr) {
		2401	av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
		2402	return AVERROR_INVALIDDATA;
		2403	}
		2404
		2405	if (uses_vdpau(avctx)) {
		2406	s->slice_count++;
		2407	break;
		2408	}
		2409
		2410	if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
		2411	!avctx->hwaccel) {
		2412	int threshold = (s2->mb_height * s->slice_count +
		2413	s2->slice_context_count / 2) /
		2414	s2->slice_context_count;
		2415	av_assert0(avctx->thread_count > 1);
		2416	if (threshold <= mb_y) {
		2417	MpegEncContext *thread_context = s2->thread_context[s->slice_count];
		2418
		2419	thread_context->start_mb_y = mb_y;
		2420	thread_context->end_mb_y = s2->mb_height;
		2421	if (s->slice_count) {
		2422	s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
		2423	ret = ff_update_duplicate_context(thread_context,
		2424	s2);
		2425	if (ret < 0)
		2426	return ret;
		2427	}
		2428	init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
		2429	s->slice_count++;
		2430	}
		2431	buf_ptr += 2; // FIXME add minimum number of bytes per slice
		2432	} else {
		2433	ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
		2434	emms_c();
		2435
		2436	if (ret < 0) {
		2437	if (avctx->err_recognition & AV_EF_EXPLODE)
		2438	return ret;
		2439	if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
		2440	ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR \| ER_DC_ERROR \| ER_MV_ERROR);
		2441	} else {
		2442	ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END \| ER_DC_END \| ER_MV_END);
		2443	}
		2444	}
		2445	}
		2446	break;
		2447	}
		2448	}
		2449	}
		2450
		2451	static int mpeg_decode_frame(AVCodecContext *avctx,
		2452	void data, int got_output,
		2453	AVPacket *avpkt)
		2454	{
		2455	const uint8_t *buf = avpkt->data;
		2456	int ret;
		2457	int buf_size = avpkt->size;
		2458	Mpeg1Context *s = avctx->priv_data;
		2459	AVFrame *picture = data;
		2460	MpegEncContext *s2 = &s->mpeg_enc_ctx;
		2461	av_dlog(avctx, "fill_buffer\n");
		2462
		2463	if (buf_size == 0 \|\| (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
		2464	/* special case for last picture */
		2465	if (s2->low_delay == 0 && s2->next_picture_ptr) {
		2466	int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
		2467	if (ret < 0)
		2468	return ret;
		2469
		2470	s2->next_picture_ptr = NULL;
		2471
		2472	*got_output = 1;
		2473	}
		2474	return buf_size;
		2475	}
		2476
		2477	if (s2->flags & CODEC_FLAG_TRUNCATED) {
		2478	int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
		2479
		2480	if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
		2481	return buf_size;
		2482	}
		2483
		2484	s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
		2485	if (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
		2486	\|\| s2->codec_tag == AV_RL32("BW10")
		2487	))
		2488	vcr2_init_sequence(avctx);
		2489
		2490	s->slice_count = 0;
		2491
		2492	if (avctx->extradata && !s->extradata_decoded) {
		2493	ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
		2494	if(*got_output) {
		2495	av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
		2496	*got_output = 0;
		2497	}
		2498	s->extradata_decoded = 1;
		2499	if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
		2500	s2->current_picture_ptr = NULL;
		2501	return ret;
		2502	}
		2503	}
		2504
		2505	ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
		2506	if (ret<0 \|\| *got_output)
		2507	s2->current_picture_ptr = NULL;
		2508
		2509	return ret;
		2510	}
		2511
		2512
		2513	static void flush(AVCodecContext *avctx)
		2514	{
		2515	Mpeg1Context *s = avctx->priv_data;
		2516
		2517	s->sync=0;
		2518
		2519	ff_mpeg_flush(avctx);
		2520	}
		2521
		2522	static av_cold int mpeg_decode_end(AVCodecContext *avctx)
		2523	{
		2524	Mpeg1Context *s = avctx->priv_data;
		2525
		2526	if (s->mpeg_enc_ctx_allocated)
		2527	ff_MPV_common_end(&s->mpeg_enc_ctx);
		2528	return 0;
		2529	}
		2530
		2531	static const AVProfile mpeg2_video_profiles[] = {
		2532	{ FF_PROFILE_MPEG2_422, "4:2:2" },
		2533	{ FF_PROFILE_MPEG2_HIGH, "High" },
		2534	{ FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
		2535	{ FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
		2536	{ FF_PROFILE_MPEG2_MAIN, "Main" },
		2537	{ FF_PROFILE_MPEG2_SIMPLE, "Simple" },
		2538	{ FF_PROFILE_RESERVED, "Reserved" },
		2539	{ FF_PROFILE_RESERVED, "Reserved" },
		2540	{ FF_PROFILE_UNKNOWN },
		2541	};
		2542
		2543
		2544	AVCodec ff_mpeg1video_decoder = {
		2545	.name = "mpeg1video",
		2546	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
		2547	.type = AVMEDIA_TYPE_VIDEO,
		2548	.id = AV_CODEC_ID_MPEG1VIDEO,
		2549	.priv_data_size = sizeof(Mpeg1Context),
		2550	.init = mpeg_decode_init,
		2551	.close = mpeg_decode_end,
		2552	.decode = mpeg_decode_frame,
		2553	.capabilities = CODEC_CAP_DRAW_HORIZ_BAND \| CODEC_CAP_DR1 \|
		2554	CODEC_CAP_TRUNCATED \| CODEC_CAP_DELAY \|
		2555	CODEC_CAP_SLICE_THREADS,
		2556	.flush = flush,
		2557	.max_lowres = 3,
		2558	.update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
		2559	};
		2560
		2561	AVCodec ff_mpeg2video_decoder = {
		2562	.name = "mpeg2video",
		2563	.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
		2564	.type = AVMEDIA_TYPE_VIDEO,
		2565	.id = AV_CODEC_ID_MPEG2VIDEO,
		2566	.priv_data_size = sizeof(Mpeg1Context),
		2567	.init = mpeg_decode_init,
		2568	.close = mpeg_decode_end,
		2569	.decode = mpeg_decode_frame,
		2570	.capabilities = CODEC_CAP_DRAW_HORIZ_BAND \| CODEC_CAP_DR1 \|
		2571	CODEC_CAP_TRUNCATED \| CODEC_CAP_DELAY \|
		2572	CODEC_CAP_SLICE_THREADS,
		2573	.flush = flush,
		2574	.max_lowres = 3,
		2575	.profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
		2576	};
		2577
		2578	//legacy decoder
		2579	AVCodec ff_mpegvideo_decoder = {
		2580	.name = "mpegvideo",
		2581	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
		2582	.type = AVMEDIA_TYPE_VIDEO,
		2583	.id = AV_CODEC_ID_MPEG2VIDEO,
		2584	.priv_data_size = sizeof(Mpeg1Context),
		2585	.init = mpeg_decode_init,
		2586	.close = mpeg_decode_end,
		2587	.decode = mpeg_decode_frame,
		2588	.capabilities = CODEC_CAP_DRAW_HORIZ_BAND \| CODEC_CAP_DR1 \| CODEC_CAP_TRUNCATED \| CODEC_CAP_DELAY \| CODEC_CAP_SLICE_THREADS,
		2589	.flush = flush,
		2590	.max_lowres = 3,
		2591	};
		2592
		2593	#if CONFIG_MPEG_XVMC_DECODER
		2594	static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
		2595	{
		2596	if (avctx->active_thread_type & FF_THREAD_SLICE)
		2597	return -1;
		2598	if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
		2599	return -1;
		2600	if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
		2601	av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
		2602	}
		2603	mpeg_decode_init(avctx);
		2604
		2605	avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
		2606	avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
		2607
		2608	return 0;
		2609	}
		2610
		2611	AVCodec ff_mpeg_xvmc_decoder = {
		2612	.name = "mpegvideo_xvmc",
		2613	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
		2614	.type = AVMEDIA_TYPE_VIDEO,
		2615	.id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
		2616	.priv_data_size = sizeof(Mpeg1Context),
		2617	.init = mpeg_mc_decode_init,
		2618	.close = mpeg_decode_end,
		2619	.decode = mpeg_decode_frame,
		2620	.capabilities = CODEC_CAP_DRAW_HORIZ_BAND \| CODEC_CAP_DR1 \|
		2621	CODEC_CAP_TRUNCATED\| CODEC_CAP_HWACCEL \| CODEC_CAP_DELAY,
		2622	.flush = flush,
		2623	};
		2624
		2625	#endif
		2626
		2627	#if CONFIG_MPEG_VDPAU_DECODER
		2628	AVCodec ff_mpeg_vdpau_decoder = {
		2629	.name = "mpegvideo_vdpau",
		2630	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
		2631	.type = AVMEDIA_TYPE_VIDEO,
		2632	.id = AV_CODEC_ID_MPEG2VIDEO,
		2633	.priv_data_size = sizeof(Mpeg1Context),
		2634	.init = mpeg_decode_init,
		2635	.close = mpeg_decode_end,
		2636	.decode = mpeg_decode_frame,
		2637	.capabilities = CODEC_CAP_DR1 \| CODEC_CAP_TRUNCATED \|
		2638	CODEC_CAP_HWACCEL_VDPAU \| CODEC_CAP_DELAY,
		2639	.flush = flush,
		2640	};
		2641	#endif
		2642
		2643	#if CONFIG_MPEG1_VDPAU_DECODER
		2644	AVCodec ff_mpeg1_vdpau_decoder = {
		2645	.name = "mpeg1video_vdpau",
		2646	.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
		2647	.type = AVMEDIA_TYPE_VIDEO,
		2648	.id = AV_CODEC_ID_MPEG1VIDEO,
		2649	.priv_data_size = sizeof(Mpeg1Context),
		2650	.init = mpeg_decode_init,
		2651	.close = mpeg_decode_end,
		2652	.decode = mpeg_decode_frame,
		2653	.capabilities = CODEC_CAP_DR1 \| CODEC_CAP_TRUNCATED \|
		2654	CODEC_CAP_HWACCEL_VDPAU \| CODEC_CAP_DELAY,
		2655	.flush = flush,
		2656	};
		2657	#endif

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(root)/contrib/sdk/sources/ffmpeg/libavcodec/mpeg12dec.c – Rev 4349