Add new decoder property max_lowres and do not init decoder if requested value is...
[libav.git] / libavcodec / mpeg12.c
1 /*
2 * MPEG-1/2 decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 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 DEBUG
29 #include "internal.h"
30 #include "avcodec.h"
31 #include "dsputil.h"
32 #include "mpegvideo.h"
33
34 #include "mpeg12.h"
35 #include "mpeg12data.h"
36 #include "mpeg12decdata.h"
37 #include "bytestream.h"
38 #include "vdpau_internal.h"
39 #include "xvmc_internal.h"
40
41 //#undef NDEBUG
42 //#include <assert.h>
43
44
45 #define MV_VLC_BITS 9
46 #define MBINCR_VLC_BITS 9
47 #define MB_PAT_VLC_BITS 9
48 #define MB_PTYPE_VLC_BITS 6
49 #define MB_BTYPE_VLC_BITS 6
50
51 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
52 DCTELEM *block,
53 int n);
54 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
55 DCTELEM *block,
56 int n);
57 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
58 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
59 DCTELEM *block,
60 int n);
61 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
62 DCTELEM *block,
63 int n);
64 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
65 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
66 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
67 static void exchange_uv(MpegEncContext *s);
68
69 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
70 PIX_FMT_XVMC_MPEG2_IDCT,
71 PIX_FMT_XVMC_MPEG2_MC,
72 PIX_FMT_NONE};
73
74 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
75
76
77 #define INIT_2D_VLC_RL(rl, static_size)\
78 {\
79 static RL_VLC_ELEM rl_vlc_table[static_size];\
80 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
81 &rl.table_vlc[0][1], 4, 2,\
82 &rl.table_vlc[0][0], 4, 2, static_size);\
83 \
84 rl.rl_vlc[0]= rl_vlc_table;\
85 init_2d_vlc_rl(&rl);\
86 }
87
88 static void init_2d_vlc_rl(RLTable *rl)
89 {
90 int i;
91
92 for(i=0; i<rl->vlc.table_size; i++){
93 int code= rl->vlc.table[i][0];
94 int len = rl->vlc.table[i][1];
95 int level, run;
96
97 if(len==0){ // illegal code
98 run= 65;
99 level= MAX_LEVEL;
100 }else if(len<0){ //more bits needed
101 run= 0;
102 level= code;
103 }else{
104 if(code==rl->n){ //esc
105 run= 65;
106 level= 0;
107 }else if(code==rl->n+1){ //eob
108 run= 0;
109 level= 127;
110 }else{
111 run= rl->table_run [code] + 1;
112 level= rl->table_level[code];
113 }
114 }
115 rl->rl_vlc[0][i].len= len;
116 rl->rl_vlc[0][i].level= level;
117 rl->rl_vlc[0][i].run= run;
118 }
119 }
120
121 void ff_mpeg12_common_init(MpegEncContext *s)
122 {
123
124 s->y_dc_scale_table=
125 s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
126
127 }
128
129 void ff_mpeg1_clean_buffers(MpegEncContext *s){
130 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
131 s->last_dc[1] = s->last_dc[0];
132 s->last_dc[2] = s->last_dc[0];
133 memset(s->last_mv, 0, sizeof(s->last_mv));
134 }
135
136
137 /******************************************/
138 /* decoding */
139
140 static VLC mv_vlc;
141 static VLC mbincr_vlc;
142 static VLC mb_ptype_vlc;
143 static VLC mb_btype_vlc;
144 static VLC mb_pat_vlc;
145
146 av_cold void ff_mpeg12_init_vlcs(void)
147 {
148 static int done = 0;
149
150 if (!done) {
151 done = 1;
152
153 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
154 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
155 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
156 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
157 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
158 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
159 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
160 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
161 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
162 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
163 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
164 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
165 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
166 &ff_mpeg12_mbPatTable[0][1], 2, 1,
167 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
168
169 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
170 &table_mb_ptype[0][1], 2, 1,
171 &table_mb_ptype[0][0], 2, 1, 64);
172 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
173 &table_mb_btype[0][1], 2, 1,
174 &table_mb_btype[0][0], 2, 1, 64);
175 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
176 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
177
178 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
179 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
180 }
181 }
182
183 static inline int get_dmv(MpegEncContext *s)
184 {
185 if(get_bits1(&s->gb))
186 return 1 - (get_bits1(&s->gb) << 1);
187 else
188 return 0;
189 }
190
191 static inline int get_qscale(MpegEncContext *s)
192 {
193 int qscale = get_bits(&s->gb, 5);
194 if (s->q_scale_type) {
195 return non_linear_qscale[qscale];
196 } else {
197 return qscale << 1;
198 }
199 }
200
201 /* motion type (for MPEG-2) */
202 #define MT_FIELD 1
203 #define MT_FRAME 2
204 #define MT_16X8 2
205 #define MT_DMV 3
206
207 static int mpeg_decode_mb(MpegEncContext *s,
208 DCTELEM block[12][64])
209 {
210 int i, j, k, cbp, val, mb_type, motion_type;
211 const int mb_block_count = 4 + (1<< s->chroma_format);
212
213 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
214
215 assert(s->mb_skipped==0);
216
217 if (s->mb_skip_run-- != 0) {
218 if (s->pict_type == FF_P_TYPE) {
219 s->mb_skipped = 1;
220 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
221 } else {
222 int mb_type;
223
224 if(s->mb_x)
225 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
226 else
227 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
228 if(IS_INTRA(mb_type))
229 return -1;
230
231 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
232 mb_type | MB_TYPE_SKIP;
233 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
234
235 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
236 s->mb_skipped = 1;
237 }
238
239 return 0;
240 }
241
242 switch(s->pict_type) {
243 default:
244 case FF_I_TYPE:
245 if (get_bits1(&s->gb) == 0) {
246 if (get_bits1(&s->gb) == 0){
247 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
248 return -1;
249 }
250 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
251 } else {
252 mb_type = MB_TYPE_INTRA;
253 }
254 break;
255 case FF_P_TYPE:
256 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
257 if (mb_type < 0){
258 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
259 return -1;
260 }
261 mb_type = ptype2mb_type[ mb_type ];
262 break;
263 case FF_B_TYPE:
264 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
265 if (mb_type < 0){
266 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
267 return -1;
268 }
269 mb_type = btype2mb_type[ mb_type ];
270 break;
271 }
272 dprintf(s->avctx, "mb_type=%x\n", mb_type);
273 // motion_type = 0; /* avoid warning */
274 if (IS_INTRA(mb_type)) {
275 s->dsp.clear_blocks(s->block[0]);
276
277 if(!s->chroma_y_shift){
278 s->dsp.clear_blocks(s->block[6]);
279 }
280
281 /* compute DCT type */
282 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
283 !s->frame_pred_frame_dct) {
284 s->interlaced_dct = get_bits1(&s->gb);
285 }
286
287 if (IS_QUANT(mb_type))
288 s->qscale = get_qscale(s);
289
290 if (s->concealment_motion_vectors) {
291 /* just parse them */
292 if (s->picture_structure != PICT_FRAME)
293 skip_bits1(&s->gb); /* field select */
294
295 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
296 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
297 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
298 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
299
300 skip_bits1(&s->gb); /* marker */
301 }else
302 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
303 s->mb_intra = 1;
304 //if 1, we memcpy blocks in xvmcvideo
305 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
306 ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
307 if(s->swap_uv){
308 exchange_uv(s);
309 }
310 }
311
312 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
313 if(s->flags2 & CODEC_FLAG2_FAST){
314 for(i=0;i<6;i++) {
315 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
316 }
317 }else{
318 for(i=0;i<mb_block_count;i++) {
319 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
320 return -1;
321 }
322 }
323 } else {
324 for(i=0;i<6;i++) {
325 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
326 return -1;
327 }
328 }
329 } else {
330 if (mb_type & MB_TYPE_ZERO_MV){
331 assert(mb_type & MB_TYPE_CBP);
332
333 s->mv_dir = MV_DIR_FORWARD;
334 if(s->picture_structure == PICT_FRAME){
335 if(!s->frame_pred_frame_dct)
336 s->interlaced_dct = get_bits1(&s->gb);
337 s->mv_type = MV_TYPE_16X16;
338 }else{
339 s->mv_type = MV_TYPE_FIELD;
340 mb_type |= MB_TYPE_INTERLACED;
341 s->field_select[0][0]= s->picture_structure - 1;
342 }
343
344 if (IS_QUANT(mb_type))
345 s->qscale = get_qscale(s);
346
347 s->last_mv[0][0][0] = 0;
348 s->last_mv[0][0][1] = 0;
349 s->last_mv[0][1][0] = 0;
350 s->last_mv[0][1][1] = 0;
351 s->mv[0][0][0] = 0;
352 s->mv[0][0][1] = 0;
353 }else{
354 assert(mb_type & MB_TYPE_L0L1);
355 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
356 /* get additional motion vector type */
357 if (s->frame_pred_frame_dct)
358 motion_type = MT_FRAME;
359 else{
360 motion_type = get_bits(&s->gb, 2);
361 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
362 s->interlaced_dct = get_bits1(&s->gb);
363 }
364
365 if (IS_QUANT(mb_type))
366 s->qscale = get_qscale(s);
367
368 /* motion vectors */
369 s->mv_dir= (mb_type>>13)&3;
370 dprintf(s->avctx, "motion_type=%d\n", motion_type);
371 switch(motion_type) {
372 case MT_FRAME: /* or MT_16X8 */
373 if (s->picture_structure == PICT_FRAME) {
374 mb_type |= MB_TYPE_16x16;
375 s->mv_type = MV_TYPE_16X16;
376 for(i=0;i<2;i++) {
377 if (USES_LIST(mb_type, i)) {
378 /* MT_FRAME */
379 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
380 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
381 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
382 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
383 /* full_pel: only for MPEG-1 */
384 if (s->full_pel[i]){
385 s->mv[i][0][0] <<= 1;
386 s->mv[i][0][1] <<= 1;
387 }
388 }
389 }
390 } else {
391 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
392 s->mv_type = MV_TYPE_16X8;
393 for(i=0;i<2;i++) {
394 if (USES_LIST(mb_type, i)) {
395 /* MT_16X8 */
396 for(j=0;j<2;j++) {
397 s->field_select[i][j] = get_bits1(&s->gb);
398 for(k=0;k<2;k++) {
399 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
400 s->last_mv[i][j][k]);
401 s->last_mv[i][j][k] = val;
402 s->mv[i][j][k] = val;
403 }
404 }
405 }
406 }
407 }
408 break;
409 case MT_FIELD:
410 s->mv_type = MV_TYPE_FIELD;
411 if (s->picture_structure == PICT_FRAME) {
412 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
413 for(i=0;i<2;i++) {
414 if (USES_LIST(mb_type, i)) {
415 for(j=0;j<2;j++) {
416 s->field_select[i][j] = get_bits1(&s->gb);
417 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
418 s->last_mv[i][j][0]);
419 s->last_mv[i][j][0] = val;
420 s->mv[i][j][0] = val;
421 dprintf(s->avctx, "fmx=%d\n", val);
422 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
423 s->last_mv[i][j][1] >> 1);
424 s->last_mv[i][j][1] = val << 1;
425 s->mv[i][j][1] = val;
426 dprintf(s->avctx, "fmy=%d\n", val);
427 }
428 }
429 }
430 } else {
431 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
432 for(i=0;i<2;i++) {
433 if (USES_LIST(mb_type, i)) {
434 s->field_select[i][0] = get_bits1(&s->gb);
435 for(k=0;k<2;k++) {
436 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
437 s->last_mv[i][0][k]);
438 s->last_mv[i][0][k] = val;
439 s->last_mv[i][1][k] = val;
440 s->mv[i][0][k] = val;
441 }
442 }
443 }
444 }
445 break;
446 case MT_DMV:
447 s->mv_type = MV_TYPE_DMV;
448 for(i=0;i<2;i++) {
449 if (USES_LIST(mb_type, i)) {
450 int dmx, dmy, mx, my, m;
451 const int my_shift= s->picture_structure == PICT_FRAME;
452
453 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
454 s->last_mv[i][0][0]);
455 s->last_mv[i][0][0] = mx;
456 s->last_mv[i][1][0] = mx;
457 dmx = get_dmv(s);
458 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
459 s->last_mv[i][0][1] >> my_shift);
460 dmy = get_dmv(s);
461
462
463 s->last_mv[i][0][1] = my<<my_shift;
464 s->last_mv[i][1][1] = my<<my_shift;
465
466 s->mv[i][0][0] = mx;
467 s->mv[i][0][1] = my;
468 s->mv[i][1][0] = mx;//not used
469 s->mv[i][1][1] = my;//not used
470
471 if (s->picture_structure == PICT_FRAME) {
472 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
473
474 //m = 1 + 2 * s->top_field_first;
475 m = s->top_field_first ? 1 : 3;
476
477 /* top -> top pred */
478 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
479 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
480 m = 4 - m;
481 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
483 } else {
484 mb_type |= MB_TYPE_16x16;
485
486 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
487 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
488 if(s->picture_structure == PICT_TOP_FIELD)
489 s->mv[i][2][1]--;
490 else
491 s->mv[i][2][1]++;
492 }
493 }
494 }
495 break;
496 default:
497 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
498 return -1;
499 }
500 }
501
502 s->mb_intra = 0;
503 if (HAS_CBP(mb_type)) {
504 s->dsp.clear_blocks(s->block[0]);
505
506 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
507 if(mb_block_count > 6){
508 cbp<<= mb_block_count-6;
509 cbp |= get_bits(&s->gb, mb_block_count-6);
510 s->dsp.clear_blocks(s->block[6]);
511 }
512 if (cbp <= 0){
513 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
514 return -1;
515 }
516
517 //if 1, we memcpy blocks in xvmcvideo
518 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
519 ff_xvmc_pack_pblocks(s,cbp);
520 if(s->swap_uv){
521 exchange_uv(s);
522 }
523 }
524
525 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
526 if(s->flags2 & CODEC_FLAG2_FAST){
527 for(i=0;i<6;i++) {
528 if(cbp & 32) {
529 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
530 } else {
531 s->block_last_index[i] = -1;
532 }
533 cbp+=cbp;
534 }
535 }else{
536 cbp<<= 12-mb_block_count;
537
538 for(i=0;i<mb_block_count;i++) {
539 if ( cbp & (1<<11) ) {
540 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
541 return -1;
542 } else {
543 s->block_last_index[i] = -1;
544 }
545 cbp+=cbp;
546 }
547 }
548 } else {
549 if(s->flags2 & CODEC_FLAG2_FAST){
550 for(i=0;i<6;i++) {
551 if (cbp & 32) {
552 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
553 } else {
554 s->block_last_index[i] = -1;
555 }
556 cbp+=cbp;
557 }
558 }else{
559 for(i=0;i<6;i++) {
560 if (cbp & 32) {
561 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
562 return -1;
563 } else {
564 s->block_last_index[i] = -1;
565 }
566 cbp+=cbp;
567 }
568 }
569 }
570 }else{
571 for(i=0;i<12;i++)
572 s->block_last_index[i] = -1;
573 }
574 }
575
576 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
577
578 return 0;
579 }
580
581 /* as H.263, but only 17 codes */
582 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
583 {
584 int code, sign, val, l, shift;
585
586 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
587 if (code == 0) {
588 return pred;
589 }
590 if (code < 0) {
591 return 0xffff;
592 }
593
594 sign = get_bits1(&s->gb);
595 shift = fcode - 1;
596 val = code;
597 if (shift) {
598 val = (val - 1) << shift;
599 val |= get_bits(&s->gb, shift);
600 val++;
601 }
602 if (sign)
603 val = -val;
604 val += pred;
605
606 /* modulo decoding */
607 l= INT_BIT - 5 - shift;
608 val = (val<<l)>>l;
609 return val;
610 }
611
612 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
613 DCTELEM *block,
614 int n)
615 {
616 int level, dc, diff, i, j, run;
617 int component;
618 RLTable *rl = &ff_rl_mpeg1;
619 uint8_t * const scantable= s->intra_scantable.permutated;
620 const uint16_t *quant_matrix= s->intra_matrix;
621 const int qscale= s->qscale;
622
623 /* DC coefficient */
624 component = (n <= 3 ? 0 : n - 4 + 1);
625 diff = decode_dc(&s->gb, component);
626 if (diff >= 0xffff)
627 return -1;
628 dc = s->last_dc[component];
629 dc += diff;
630 s->last_dc[component] = dc;
631 block[0] = dc*quant_matrix[0];
632 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
633 i = 0;
634 {
635 OPEN_READER(re, &s->gb);
636 /* now quantify & encode AC coefficients */
637 for(;;) {
638 UPDATE_CACHE(re, &s->gb);
639 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
640
641 if(level == 127){
642 break;
643 } else if(level != 0) {
644 i += run;
645 j = scantable[i];
646 level= (level*qscale*quant_matrix[j])>>4;
647 level= (level-1)|1;
648 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
649 LAST_SKIP_BITS(re, &s->gb, 1);
650 } else {
651 /* escape */
652 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
653 UPDATE_CACHE(re, &s->gb);
654 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
655 if (level == -128) {
656 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
657 } else if (level == 0) {
658 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
659 }
660 i += run;
661 j = scantable[i];
662 if(level<0){
663 level= -level;
664 level= (level*qscale*quant_matrix[j])>>4;
665 level= (level-1)|1;
666 level= -level;
667 }else{
668 level= (level*qscale*quant_matrix[j])>>4;
669 level= (level-1)|1;
670 }
671 }
672 if (i > 63){
673 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
674 return -1;
675 }
676
677 block[j] = level;
678 }
679 CLOSE_READER(re, &s->gb);
680 }
681 s->block_last_index[n] = i;
682 return 0;
683 }
684
685 int ff_mpeg1_decode_block_intra(MpegEncContext *s,
686 DCTELEM *block,
687 int n)
688 {
689 return mpeg1_decode_block_intra(s, block, n);
690 }
691
692 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
693 DCTELEM *block,
694 int n)
695 {
696 int level, i, j, run;
697 RLTable *rl = &ff_rl_mpeg1;
698 uint8_t * const scantable= s->intra_scantable.permutated;
699 const uint16_t *quant_matrix= s->inter_matrix;
700 const int qscale= s->qscale;
701
702 {
703 OPEN_READER(re, &s->gb);
704 i = -1;
705 // special case for first coefficient, no need to add second VLC table
706 UPDATE_CACHE(re, &s->gb);
707 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
708 level= (3*qscale*quant_matrix[0])>>5;
709 level= (level-1)|1;
710 if(GET_CACHE(re, &s->gb)&0x40000000)
711 level= -level;
712 block[0] = level;
713 i++;
714 SKIP_BITS(re, &s->gb, 2);
715 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
716 goto end;
717 }
718 #if MIN_CACHE_BITS < 19
719 UPDATE_CACHE(re, &s->gb);
720 #endif
721 /* now quantify & encode AC coefficients */
722 for(;;) {
723 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
724
725 if(level != 0) {
726 i += run;
727 j = scantable[i];
728 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
729 level= (level-1)|1;
730 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
731 SKIP_BITS(re, &s->gb, 1);
732 } else {
733 /* escape */
734 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
735 UPDATE_CACHE(re, &s->gb);
736 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
737 if (level == -128) {
738 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
739 } else if (level == 0) {
740 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
741 }
742 i += run;
743 j = scantable[i];
744 if(level<0){
745 level= -level;
746 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
747 level= (level-1)|1;
748 level= -level;
749 }else{
750 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
751 level= (level-1)|1;
752 }
753 }
754 if (i > 63){
755 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
756 return -1;
757 }
758
759 block[j] = level;
760 #if MIN_CACHE_BITS < 19
761 UPDATE_CACHE(re, &s->gb);
762 #endif
763 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
764 break;
765 #if MIN_CACHE_BITS >= 19
766 UPDATE_CACHE(re, &s->gb);
767 #endif
768 }
769 end:
770 LAST_SKIP_BITS(re, &s->gb, 2);
771 CLOSE_READER(re, &s->gb);
772 }
773 s->block_last_index[n] = i;
774 return 0;
775 }
776
777 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
778 {
779 int level, i, j, run;
780 RLTable *rl = &ff_rl_mpeg1;
781 uint8_t * const scantable= s->intra_scantable.permutated;
782 const int qscale= s->qscale;
783
784 {
785 OPEN_READER(re, &s->gb);
786 i = -1;
787 // special case for first coefficient, no need to add second VLC table
788 UPDATE_CACHE(re, &s->gb);
789 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
790 level= (3*qscale)>>1;
791 level= (level-1)|1;
792 if(GET_CACHE(re, &s->gb)&0x40000000)
793 level= -level;
794 block[0] = level;
795 i++;
796 SKIP_BITS(re, &s->gb, 2);
797 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
798 goto end;
799 }
800 #if MIN_CACHE_BITS < 19
801 UPDATE_CACHE(re, &s->gb);
802 #endif
803
804 /* now quantify & encode AC coefficients */
805 for(;;) {
806 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
807
808 if(level != 0) {
809 i += run;
810 j = scantable[i];
811 level= ((level*2+1)*qscale)>>1;
812 level= (level-1)|1;
813 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
814 SKIP_BITS(re, &s->gb, 1);
815 } else {
816 /* escape */
817 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
818 UPDATE_CACHE(re, &s->gb);
819 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
820 if (level == -128) {
821 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
822 } else if (level == 0) {
823 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
824 }
825 i += run;
826 j = scantable[i];
827 if(level<0){
828 level= -level;
829 level= ((level*2+1)*qscale)>>1;
830 level= (level-1)|1;
831 level= -level;
832 }else{
833 level= ((level*2+1)*qscale)>>1;
834 level= (level-1)|1;
835 }
836 }
837
838 block[j] = level;
839 #if MIN_CACHE_BITS < 19
840 UPDATE_CACHE(re, &s->gb);
841 #endif
842 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
843 break;
844 #if MIN_CACHE_BITS >= 19
845 UPDATE_CACHE(re, &s->gb);
846 #endif
847 }
848 end:
849 LAST_SKIP_BITS(re, &s->gb, 2);
850 CLOSE_READER(re, &s->gb);
851 }
852 s->block_last_index[n] = i;
853 return 0;
854 }
855
856
857 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
858 DCTELEM *block,
859 int n)
860 {
861 int level, i, j, run;
862 RLTable *rl = &ff_rl_mpeg1;
863 uint8_t * const scantable= s->intra_scantable.permutated;
864 const uint16_t *quant_matrix;
865 const int qscale= s->qscale;
866 int mismatch;
867
868 mismatch = 1;
869
870 {
871 OPEN_READER(re, &s->gb);
872 i = -1;
873 if (n < 4)
874 quant_matrix = s->inter_matrix;
875 else
876 quant_matrix = s->chroma_inter_matrix;
877
878 // special case for first coefficient, no need to add second VLC table
879 UPDATE_CACHE(re, &s->gb);
880 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
881 level= (3*qscale*quant_matrix[0])>>5;
882 if(GET_CACHE(re, &s->gb)&0x40000000)
883 level= -level;
884 block[0] = level;
885 mismatch ^= level;
886 i++;
887 SKIP_BITS(re, &s->gb, 2);
888 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
889 goto end;
890 }
891 #if MIN_CACHE_BITS < 19
892 UPDATE_CACHE(re, &s->gb);
893 #endif
894
895 /* now quantify & encode AC coefficients */
896 for(;;) {
897 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
898
899 if(level != 0) {
900 i += run;
901 j = scantable[i];
902 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
903 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
904 SKIP_BITS(re, &s->gb, 1);
905 } else {
906 /* escape */
907 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
908 UPDATE_CACHE(re, &s->gb);
909 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
910
911 i += run;
912 j = scantable[i];
913 if(level<0){
914 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
915 level= -level;
916 }else{
917 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
918 }
919 }
920 if (i > 63){
921 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
922 return -1;
923 }
924
925 mismatch ^= level;
926 block[j] = level;
927 #if MIN_CACHE_BITS < 19
928 UPDATE_CACHE(re, &s->gb);
929 #endif
930 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
931 break;
932 #if MIN_CACHE_BITS >= 19
933 UPDATE_CACHE(re, &s->gb);
934 #endif
935 }
936 end:
937 LAST_SKIP_BITS(re, &s->gb, 2);
938 CLOSE_READER(re, &s->gb);
939 }
940 block[63] ^= (mismatch & 1);
941
942 s->block_last_index[n] = i;
943 return 0;
944 }
945
946 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
947 DCTELEM *block,
948 int n)
949 {
950 int level, i, j, run;
951 RLTable *rl = &ff_rl_mpeg1;
952 uint8_t * const scantable= s->intra_scantable.permutated;
953 const int qscale= s->qscale;
954 OPEN_READER(re, &s->gb);
955 i = -1;
956
957 // special case for first coefficient, no need to add second VLC table
958 UPDATE_CACHE(re, &s->gb);
959 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
960 level= (3*qscale)>>1;
961 if(GET_CACHE(re, &s->gb)&0x40000000)
962 level= -level;
963 block[0] = level;
964 i++;
965 SKIP_BITS(re, &s->gb, 2);
966 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
967 goto end;
968 }
969 #if MIN_CACHE_BITS < 19
970 UPDATE_CACHE(re, &s->gb);
971 #endif
972
973 /* now quantify & encode AC coefficients */
974 for(;;) {
975 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
976
977 if(level != 0) {
978 i += run;
979 j = scantable[i];
980 level= ((level*2+1)*qscale)>>1;
981 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
982 SKIP_BITS(re, &s->gb, 1);
983 } else {
984 /* escape */
985 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
986 UPDATE_CACHE(re, &s->gb);
987 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
988
989 i += run;
990 j = scantable[i];
991 if(level<0){
992 level= ((-level*2+1)*qscale)>>1;
993 level= -level;
994 }else{
995 level= ((level*2+1)*qscale)>>1;
996 }
997 }
998
999 block[j] = level;
1000 #if MIN_CACHE_BITS < 19
1001 UPDATE_CACHE(re, &s->gb);
1002 #endif
1003 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1004 break;
1005 #if MIN_CACHE_BITS >=19
1006 UPDATE_CACHE(re, &s->gb);
1007 #endif
1008 }
1009 end:
1010 LAST_SKIP_BITS(re, &s->gb, 2);
1011 CLOSE_READER(re, &s->gb);
1012 s->block_last_index[n] = i;
1013 return 0;
1014 }
1015
1016
1017 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1018 DCTELEM *block,
1019 int n)
1020 {
1021 int level, dc, diff, i, j, run;
1022 int component;
1023 RLTable *rl;
1024 uint8_t * const scantable= s->intra_scantable.permutated;
1025 const uint16_t *quant_matrix;
1026 const int qscale= s->qscale;
1027 int mismatch;
1028
1029 /* DC coefficient */
1030 if (n < 4){
1031 quant_matrix = s->intra_matrix;
1032 component = 0;
1033 }else{
1034 quant_matrix = s->chroma_intra_matrix;
1035 component = (n&1) + 1;
1036 }
1037 diff = decode_dc(&s->gb, component);
1038 if (diff >= 0xffff)
1039 return -1;
1040 dc = s->last_dc[component];
1041 dc += diff;
1042 s->last_dc[component] = dc;
1043 block[0] = dc << (3 - s->intra_dc_precision);
1044 dprintf(s->avctx, "dc=%d\n", block[0]);
1045 mismatch = block[0] ^ 1;
1046 i = 0;
1047 if (s->intra_vlc_format)
1048 rl = &ff_rl_mpeg2;
1049 else
1050 rl = &ff_rl_mpeg1;
1051
1052 {
1053 OPEN_READER(re, &s->gb);
1054 /* now quantify & encode AC coefficients */
1055 for(;;) {
1056 UPDATE_CACHE(re, &s->gb);
1057 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1058
1059 if(level == 127){
1060 break;
1061 } else if(level != 0) {
1062 i += run;
1063 j = scantable[i];
1064 level= (level*qscale*quant_matrix[j])>>4;
1065 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1066 LAST_SKIP_BITS(re, &s->gb, 1);
1067 } else {
1068 /* escape */
1069 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1070 UPDATE_CACHE(re, &s->gb);
1071 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1072 i += run;
1073 j = scantable[i];
1074 if(level<0){
1075 level= (-level*qscale*quant_matrix[j])>>4;
1076 level= -level;
1077 }else{
1078 level= (level*qscale*quant_matrix[j])>>4;
1079 }
1080 }
1081 if (i > 63){
1082 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1083 return -1;
1084 }
1085
1086 mismatch^= level;
1087 block[j] = level;
1088 }
1089 CLOSE_READER(re, &s->gb);
1090 }
1091 block[63]^= mismatch&1;
1092
1093 s->block_last_index[n] = i;
1094 return 0;
1095 }
1096
1097 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1098 DCTELEM *block,
1099 int n)
1100 {
1101 int level, dc, diff, j, run;
1102 int component;
1103 RLTable *rl;
1104 uint8_t * scantable= s->intra_scantable.permutated;
1105 const uint16_t *quant_matrix;
1106 const int qscale= s->qscale;
1107
1108 /* DC coefficient */
1109 if (n < 4){
1110 quant_matrix = s->intra_matrix;
1111 component = 0;
1112 }else{
1113 quant_matrix = s->chroma_intra_matrix;
1114 component = (n&1) + 1;
1115 }
1116 diff = decode_dc(&s->gb, component);
1117 if (diff >= 0xffff)
1118 return -1;
1119 dc = s->last_dc[component];
1120 dc += diff;
1121 s->last_dc[component] = dc;
1122 block[0] = dc << (3 - s->intra_dc_precision);
1123 if (s->intra_vlc_format)
1124 rl = &ff_rl_mpeg2;
1125 else
1126 rl = &ff_rl_mpeg1;
1127
1128 {
1129 OPEN_READER(re, &s->gb);
1130 /* now quantify & encode AC coefficients */
1131 for(;;) {
1132 UPDATE_CACHE(re, &s->gb);
1133 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1134
1135 if(level == 127){
1136 break;
1137 } else if(level != 0) {
1138 scantable += run;
1139 j = *scantable;
1140 level= (level*qscale*quant_matrix[j])>>4;
1141 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1142 LAST_SKIP_BITS(re, &s->gb, 1);
1143 } else {
1144 /* escape */
1145 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1146 UPDATE_CACHE(re, &s->gb);
1147 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1148 scantable += run;
1149 j = *scantable;
1150 if(level<0){
1151 level= (-level*qscale*quant_matrix[j])>>4;
1152 level= -level;
1153 }else{
1154 level= (level*qscale*quant_matrix[j])>>4;
1155 }
1156 }
1157
1158 block[j] = level;
1159 }
1160 CLOSE_READER(re, &s->gb);
1161 }
1162
1163 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1164 return 0;
1165 }
1166
1167 typedef struct Mpeg1Context {
1168 MpegEncContext mpeg_enc_ctx;
1169 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1170 int repeat_field; /* true if we must repeat the field */
1171 AVPanScan pan_scan; /** some temporary storage for the panscan */
1172 int slice_count;
1173 int swap_uv;//indicate VCR2
1174 int save_aspect_info;
1175 int save_width, save_height, save_progressive_seq;
1176 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1177 int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1178 } Mpeg1Context;
1179
1180 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1181 {
1182 Mpeg1Context *s = avctx->priv_data;
1183 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1184 int i;
1185
1186 /* we need some permutation to store matrices,
1187 * until MPV_common_init() sets the real permutation. */
1188 for(i=0;i<64;i++)
1189 s2->dsp.idct_permutation[i]=i;
1190
1191 MPV_decode_defaults(s2);
1192
1193 s->mpeg_enc_ctx.avctx= avctx;
1194 s->mpeg_enc_ctx.flags= avctx->flags;
1195 s->mpeg_enc_ctx.flags2= avctx->flags2;
1196 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1197 ff_mpeg12_init_vlcs();
1198
1199 s->mpeg_enc_ctx_allocated = 0;
1200 s->mpeg_enc_ctx.picture_number = 0;
1201 s->repeat_field = 0;
1202 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1203 avctx->color_range= AVCOL_RANGE_MPEG;
1204 if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1205 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1206 else
1207 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1208 return 0;
1209 }
1210
1211 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1212 const uint8_t *new_perm){
1213 uint16_t temp_matrix[64];
1214 int i;
1215
1216 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1217
1218 for(i=0;i<64;i++){
1219 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1220 }
1221 }
1222
1223 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1224 Mpeg1Context *s1 = avctx->priv_data;
1225 MpegEncContext *s = &s1->mpeg_enc_ctx;
1226
1227 if(avctx->xvmc_acceleration)
1228 return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1229 else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1230 if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1231 return PIX_FMT_VDPAU_MPEG1;
1232 else
1233 return PIX_FMT_VDPAU_MPEG2;
1234 }else{
1235 if(s->chroma_format < 2)
1236 return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1237 else if(s->chroma_format == 2)
1238 return PIX_FMT_YUV422P;
1239 else
1240 return PIX_FMT_YUV444P;
1241 }
1242 }
1243
1244 /* Call this function when we know all parameters.
1245 * It may be called in different places for MPEG-1 and MPEG-2. */
1246 static int mpeg_decode_postinit(AVCodecContext *avctx){
1247 Mpeg1Context *s1 = avctx->priv_data;
1248 MpegEncContext *s = &s1->mpeg_enc_ctx;
1249 uint8_t old_permutation[64];
1250
1251 if (
1252 (s1->mpeg_enc_ctx_allocated == 0)||
1253 avctx->coded_width != s->width ||
1254 avctx->coded_height != s->height||
1255 s1->save_width != s->width ||
1256 s1->save_height != s->height ||
1257 s1->save_aspect_info != s->aspect_ratio_info||
1258 s1->save_progressive_seq != s->progressive_sequence ||
1259 0)
1260 {
1261
1262 if (s1->mpeg_enc_ctx_allocated) {
1263 ParseContext pc= s->parse_context;
1264 s->parse_context.buffer=0;
1265 MPV_common_end(s);
1266 s->parse_context= pc;
1267 }
1268
1269 if( (s->width == 0 )||(s->height == 0))
1270 return -2;
1271
1272 avcodec_set_dimensions(avctx, s->width, s->height);
1273 avctx->bit_rate = s->bit_rate;
1274 s1->save_aspect_info = s->aspect_ratio_info;
1275 s1->save_width = s->width;
1276 s1->save_height = s->height;
1277 s1->save_progressive_seq = s->progressive_sequence;
1278
1279 /* low_delay may be forced, in this case we will have B-frames
1280 * that behave like P-frames. */
1281 avctx->has_b_frames = !(s->low_delay);
1282
1283 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1284 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1285 //MPEG-1 fps
1286 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1287 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1288 //MPEG-1 aspect
1289 avctx->sample_aspect_ratio= av_d2q(
1290 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1291 avctx->ticks_per_frame=1;
1292 }else{//MPEG-2
1293 //MPEG-2 fps
1294 av_reduce(
1295 &s->avctx->time_base.den,
1296 &s->avctx->time_base.num,
1297 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1298 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1299 1<<30);
1300 avctx->ticks_per_frame=2;
1301 //MPEG-2 aspect
1302 if(s->aspect_ratio_info > 1){
1303 //we ignore the spec here as reality does not match the spec, see for example
1304 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1305 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1306 s->avctx->sample_aspect_ratio=
1307 av_div_q(
1308 ff_mpeg2_aspect[s->aspect_ratio_info],
1309 (AVRational){s->width, s->height}
1310 );
1311 }else{
1312 s->avctx->sample_aspect_ratio=
1313 av_div_q(
1314 ff_mpeg2_aspect[s->aspect_ratio_info],
1315 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1316 );
1317 }
1318 }else{
1319 s->avctx->sample_aspect_ratio=
1320 ff_mpeg2_aspect[s->aspect_ratio_info];
1321 }
1322 }//MPEG-2
1323
1324 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1325 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1326 //until then pix_fmt may be changed right after codec init
1327 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1328 avctx->hwaccel ||
1329 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1330 if( avctx->idct_algo == FF_IDCT_AUTO )
1331 avctx->idct_algo = FF_IDCT_SIMPLE;
1332
1333 /* Quantization matrices may need reordering
1334 * if DCT permutation is changed. */
1335 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1336
1337 if (MPV_common_init(s) < 0)
1338 return -2;
1339
1340 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1341 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1342 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1343 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1344
1345 s1->mpeg_enc_ctx_allocated = 1;
1346 }
1347 return 0;
1348 }
1349
1350 static int mpeg1_decode_picture(AVCodecContext *avctx,
1351 const uint8_t *buf, int buf_size)
1352 {
1353 Mpeg1Context *s1 = avctx->priv_data;
1354 MpegEncContext *s = &s1->mpeg_enc_ctx;
1355 int ref, f_code, vbv_delay;
1356
1357 init_get_bits(&s->gb, buf, buf_size*8);
1358
1359 ref = get_bits(&s->gb, 10); /* temporal ref */
1360 s->pict_type = get_bits(&s->gb, 3);
1361 if(s->pict_type == 0 || s->pict_type > 3)
1362 return -1;
1363
1364 vbv_delay= get_bits(&s->gb, 16);
1365 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1366 s->full_pel[0] = get_bits1(&s->gb);
1367 f_code = get_bits(&s->gb, 3);
1368 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1369 return -1;
1370 s->mpeg_f_code[0][0] = f_code;
1371 s->mpeg_f_code[0][1] = f_code;
1372 }
1373 if (s->pict_type == FF_B_TYPE) {
1374 s->full_pel[1] = get_bits1(&s->gb);
1375 f_code = get_bits(&s->gb, 3);
1376 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1377 return -1;
1378 s->mpeg_f_code[1][0] = f_code;
1379 s->mpeg_f_code[1][1] = f_code;
1380 }
1381 s->current_picture.pict_type= s->pict_type;
1382 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1383
1384 if(avctx->debug & FF_DEBUG_PICT_INFO)
1385 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1386
1387 s->y_dc_scale = 8;
1388 s->c_dc_scale = 8;
1389 return 0;
1390 }
1391
1392 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1393 {
1394 MpegEncContext *s= &s1->mpeg_enc_ctx;
1395 int horiz_size_ext, vert_size_ext;
1396 int bit_rate_ext;
1397
1398 skip_bits(&s->gb, 1); /* profile and level esc*/
1399 s->avctx->profile= get_bits(&s->gb, 3);
1400 s->avctx->level= get_bits(&s->gb, 4);
1401 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1402 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1403 horiz_size_ext = get_bits(&s->gb, 2);
1404 vert_size_ext = get_bits(&s->gb, 2);
1405 s->width |= (horiz_size_ext << 12);
1406 s->height |= (vert_size_ext << 12);
1407 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1408 s->bit_rate += (bit_rate_ext << 18) * 400;
1409 skip_bits1(&s->gb); /* marker */
1410 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1411
1412 s->low_delay = get_bits1(&s->gb);
1413 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1414
1415 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1416 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1417
1418 dprintf(s->avctx, "sequence extension\n");
1419 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1420 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1421
1422 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1423 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1424 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1425
1426 }
1427
1428 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1429 {
1430 MpegEncContext *s= &s1->mpeg_enc_ctx;
1431 int color_description, w, h;
1432
1433 skip_bits(&s->gb, 3); /* video format */
1434 color_description= get_bits1(&s->gb);
1435 if(color_description){
1436 s->avctx->color_primaries= get_bits(&s->gb, 8);
1437 s->avctx->color_trc = get_bits(&s->gb, 8);
1438 s->avctx->colorspace = get_bits(&s->gb, 8);
1439 }
1440 w= get_bits(&s->gb, 14);
1441 skip_bits(&s->gb, 1); //marker
1442 h= get_bits(&s->gb, 14);
1443 // remaining 3 bits are zero padding
1444
1445 s1->pan_scan.width= 16*w;
1446 s1->pan_scan.height=16*h;
1447
1448 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1449 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1450 }
1451
1452 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1453 {
1454 MpegEncContext *s= &s1->mpeg_enc_ctx;
1455 int i,nofco;
1456
1457 nofco = 1;
1458 if(s->progressive_sequence){
1459 if(s->repeat_first_field){
1460 nofco++;
1461 if(s->top_field_first)
1462 nofco++;
1463 }
1464 }else{
1465 if(s->picture_structure == PICT_FRAME){
1466 nofco++;
1467 if(s->repeat_first_field)
1468 nofco++;
1469 }
1470 }
1471 for(i=0; i<nofco; i++){
1472 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1473 skip_bits(&s->gb, 1); //marker
1474 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1475 skip_bits(&s->gb, 1); //marker
1476 }
1477
1478 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1479 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1480 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1481 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1482 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1483 );
1484 }
1485
1486 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1487 int i;
1488
1489 for(i=0; i<64; i++) {
1490 int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1491 int v = get_bits(&s->gb, 8);
1492 if(v==0){
1493 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1494 return -1;
1495 }
1496 if(intra && i==0 && v!=8){
1497 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1498 v= 8; // needed by pink.mpg / issue1046
1499 }
1500 matrix0[j] = v;
1501 if(matrix1)
1502 matrix1[j] = v;
1503 }
1504 return 0;
1505 }
1506
1507 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1508 {
1509 dprintf(s->avctx, "matrix extension\n");
1510
1511 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1512 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1513 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1514 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1515 }
1516
1517 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1518 {
1519 MpegEncContext *s= &s1->mpeg_enc_ctx;
1520
1521 s->full_pel[0] = s->full_pel[1] = 0;
1522 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1523 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1524 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1525 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1526 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1527 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1528 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1529 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1530 s->pict_type= FF_I_TYPE;
1531 else
1532 s->pict_type= FF_P_TYPE;
1533 }else
1534 s->pict_type= FF_B_TYPE;
1535 s->current_picture.pict_type= s->pict_type;
1536 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1537 }
1538 s->intra_dc_precision = get_bits(&s->gb, 2);
1539 s->picture_structure = get_bits(&s->gb, 2);
1540 s->top_field_first = get_bits1(&s->gb);
1541 s->frame_pred_frame_dct = get_bits1(&s->gb);
1542 s->concealment_motion_vectors = get_bits1(&s->gb);
1543 s->q_scale_type = get_bits1(&s->gb);
1544 s->intra_vlc_format = get_bits1(&s->gb);
1545 s->alternate_scan = get_bits1(&s->gb);
1546 s->repeat_first_field = get_bits1(&s->gb);
1547 s->chroma_420_type = get_bits1(&s->gb);
1548 s->progressive_frame = get_bits1(&s->gb);
1549
1550 if(s->progressive_sequence && !s->progressive_frame){
1551 s->progressive_frame= 1;
1552 av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1553 }
1554
1555 if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1556 av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1557 s->picture_structure= PICT_FRAME;
1558 }
1559
1560 if(s->progressive_sequence && !s->frame_pred_frame_dct){
1561 av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1562 s->frame_pred_frame_dct= 1;
1563 }
1564
1565 if(s->picture_structure == PICT_FRAME){
1566 s->first_field=0;
1567 s->v_edge_pos= 16*s->mb_height;
1568 }else{
1569 s->first_field ^= 1;
1570 s->v_edge_pos= 8*s->mb_height;
1571 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1572 }
1573
1574 if(s->alternate_scan){
1575 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1576 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1577 }else{
1578 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1579 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1580 }
1581
1582 /* composite display not parsed */
1583 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1584 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1585 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1586 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1587 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1588 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1589 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1590 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1591 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1592 }
1593
1594 static void exchange_uv(MpegEncContext *s){
1595 DCTELEM (*tmp)[64];
1596
1597 tmp = s->pblocks[4];
1598 s->pblocks[4] = s->pblocks[5];
1599 s->pblocks[5] = tmp;
1600 }
1601
1602 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1603 AVCodecContext *avctx= s->avctx;
1604 Mpeg1Context *s1 = (Mpeg1Context*)s;
1605
1606 /* start frame decoding */
1607 if(s->first_field || s->picture_structure==PICT_FRAME){
1608 if(MPV_frame_start(s, avctx) < 0)
1609 return -1;
1610
1611 ff_er_frame_start(s);
1612
1613 /* first check if we must repeat the frame */
1614 s->current_picture_ptr->repeat_pict = 0;
1615 if (s->repeat_first_field) {
1616 if (s->progressive_sequence) {
1617 if (s->top_field_first)
1618 s->current_picture_ptr->repeat_pict = 4;
1619 else
1620 s->current_picture_ptr->repeat_pict = 2;
1621 } else if (s->progressive_frame) {
1622 s->current_picture_ptr->repeat_pict = 1;
1623 }
1624 }
1625
1626 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1627 }else{ //second field
1628 int i;
1629
1630 if(!s->current_picture_ptr){
1631 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1632 return -1;
1633 }
1634
1635 for(i=0; i<4; i++){
1636 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1637 if(s->picture_structure == PICT_BOTTOM_FIELD){
1638 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1639 }
1640 }
1641 }
1642
1643 if (avctx->hwaccel) {
1644 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1645 return -1;
1646 }
1647
1648 // MPV_frame_start will call this function too,
1649 // but we need to call it on every field
1650 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1651 if(ff_xvmc_field_start(s,avctx) < 0)
1652 return -1;
1653
1654 return 0;
1655 }
1656
1657 #define DECODE_SLICE_ERROR -1
1658 #define DECODE_SLICE_OK 0
1659
1660 /**
1661 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1662 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1663 * DECODE_SLICE_OK if this slice is ok<br>
1664 */
1665 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1666 const uint8_t **buf, int buf_size)
1667 {
1668 MpegEncContext *s = &s1->mpeg_enc_ctx;
1669 AVCodecContext *avctx= s->avctx;
1670 const int field_pic= s->picture_structure != PICT_FRAME;
1671 const int lowres= s->avctx->lowres;
1672
1673 s->resync_mb_x=
1674 s->resync_mb_y= -1;
1675
1676 assert(mb_y < s->mb_height);
1677
1678 init_get_bits(&s->gb, *buf, buf_size*8);
1679
1680 ff_mpeg1_clean_buffers(s);
1681 s->interlaced_dct = 0;
1682
1683 s->qscale = get_qscale(s);
1684
1685 if(s->qscale == 0){
1686 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1687 return -1;
1688 }
1689
1690 /* extra slice info */
1691 while (get_bits1(&s->gb) != 0) {
1692 skip_bits(&s->gb, 8);
1693 }
1694
1695 s->mb_x=0;
1696
1697 if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1698 skip_bits1(&s->gb);
1699 }else{
1700 for(;;) {
1701 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1702 if (code < 0){
1703 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1704 return -1;
1705 }
1706 if (code >= 33) {
1707 if (code == 33) {
1708 s->mb_x += 33;
1709 }
1710 /* otherwise, stuffing, nothing to do */
1711 } else {
1712 s->mb_x += code;
1713 break;
1714 }
1715 }
1716 }
1717
1718 if(s->mb_x >= (unsigned)s->mb_width){
1719 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1720 return -1;
1721 }
1722
1723 if (avctx->hwaccel) {
1724 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1725 int start_code = -1;
1726 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1727 if (buf_end < *buf + buf_size)
1728 buf_end -= 4;
1729 s->mb_y = mb_y;
1730 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1731 return DECODE_SLICE_ERROR;
1732 *buf = buf_end;
1733 return DECODE_SLICE_OK;
1734 }
1735
1736 s->resync_mb_x= s->mb_x;
1737 s->resync_mb_y= s->mb_y= mb_y;
1738 s->mb_skip_run= 0;
1739 ff_init_block_index(s);
1740
1741 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1742 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1743 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",
1744 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],
1745 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1746 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1747 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1748 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1749 }
1750 }
1751
1752 for(;;) {
1753 //If 1, we memcpy blocks in xvmcvideo.
1754 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1755 ff_xvmc_init_block(s);//set s->block
1756
1757 if(mpeg_decode_mb(s, s->block) < 0)
1758 return -1;
1759
1760 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1761 const int wrap = s->b8_stride;
1762 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1763 int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1764 int motion_x, motion_y, dir, i;
1765
1766 for(i=0; i<2; i++){
1767 for(dir=0; dir<2; dir++){
1768 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1769 motion_x = motion_y = 0;
1770 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1771 motion_x = s->mv[dir][0][0];
1772 motion_y = s->mv[dir][0][1];
1773 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1774 motion_x = s->mv[dir][i][0];
1775 motion_y = s->mv[dir][i][1];
1776 }
1777
1778 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1779 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1780 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1781 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1782 s->current_picture.ref_index [dir][b8_xy ]=
1783 s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1784 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1785 }
1786 xy += wrap;
1787 b8_xy +=2;
1788 }
1789 }
1790
1791 s->dest[0] += 16 >> lowres;
1792 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1793 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1794
1795 MPV_decode_mb(s, s->block);
1796
1797 if (++s->mb_x >= s->mb_width) {
1798 const int mb_size= 16>>s->avctx->lowres;
1799
1800 ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1801
1802 s->mb_x = 0;
1803 s->mb_y += 1<<field_pic;
1804
1805 if(s->mb_y >= s->mb_height){
1806 int left= get_bits_left(&s->gb);
1807 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1808 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1809 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1810
1811 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1812 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1813 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1814 return -1;
1815 }else
1816 goto eos;
1817 }
1818
1819 ff_init_block_index(s);
1820 }
1821
1822 /* skip mb handling */
1823 if (s->mb_skip_run == -1) {
1824 /* read increment again */
1825 s->mb_skip_run = 0;
1826 for(;;) {
1827 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1828 if (code < 0){
1829 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1830 return -1;
1831 }
1832 if (code >= 33) {
1833 if (code == 33) {
1834 s->mb_skip_run += 33;
1835 }else if(code == 35){
1836 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1837 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1838 return -1;
1839 }
1840 goto eos; /* end of slice */
1841 }
1842 /* otherwise, stuffing, nothing to do */
1843 } else {
1844 s->mb_skip_run += code;
1845 break;
1846 }
1847 }
1848 if(s->mb_skip_run){
1849 int i;
1850 if(s->pict_type == FF_I_TYPE){
1851 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1852 return -1;
1853 }
1854
1855 /* skip mb */
1856 s->mb_intra = 0;
1857 for(i=0;i<12;i++)
1858 s->block_last_index[i] = -1;
1859 if(s->picture_structure == PICT_FRAME)
1860 s->mv_type = MV_TYPE_16X16;
1861 else
1862 s->mv_type = MV_TYPE_FIELD;
1863 if (s->pict_type == FF_P_TYPE) {
1864 /* if P type, zero motion vector is implied */
1865 s->mv_dir = MV_DIR_FORWARD;
1866 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1867 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1868 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1869 s->field_select[0][0]= (s->picture_structure - 1) & 1;
1870 } else {
1871 /* if B type, reuse previous vectors and directions */
1872 s->mv[0][0][0] = s->last_mv[0][0][0];
1873 s->mv[0][0][1] = s->last_mv[0][0][1];
1874 s->mv[1][0][0] = s->last_mv[1][0][0];
1875 s->mv[1][0][1] = s->last_mv[1][0][1];
1876 }
1877 }
1878 }
1879 }
1880 eos: // end of slice
1881 *buf += (get_bits_count(&s->gb)-1)/8;
1882 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1883 return 0;
1884 }
1885
1886 static int slice_decode_thread(AVCodecContext *c, void *arg){
1887 MpegEncContext *s= *(void**)arg;
1888 const uint8_t *buf= s->gb.buffer;
1889 int mb_y= s->start_mb_y;
1890 const int field_pic= s->picture_structure != PICT_FRAME;
1891
1892 s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1893
1894 for(;;){
1895 uint32_t start_code;
1896 int ret;
1897
1898 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1899 emms_c();
1900 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1901 //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1902 if(ret < 0){
1903 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1904 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
1905 }else{
1906 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
1907 }
1908
1909 if(s->mb_y == s->end_mb_y)
1910 return 0;
1911
1912 start_code= -1;
1913 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1914 mb_y= start_code - SLICE_MIN_START_CODE;
1915 if(mb_y < 0 || mb_y >= s->end_mb_y)
1916 return -1;
1917 }
1918
1919 return 0; //not reached
1920 }
1921
1922 /**
1923 * Handle slice ends.
1924 * @return 1 if it seems to be the last slice
1925 */
1926 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1927 {
1928 Mpeg1Context *s1 = avctx->priv_data;
1929 MpegEncContext *s = &s1->mpeg_enc_ctx;
1930
1931 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1932 return 0;
1933
1934 if (s->avctx->hwaccel) {
1935 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1936 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1937 }
1938
1939 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1940 ff_xvmc_field_end(s);
1941
1942 /* end of slice reached */
1943 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1944 /* end of image */
1945
1946 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1947
1948 ff_er_frame_end(s);
1949
1950 MPV_frame_end(s);
1951
1952 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1953 *pict= *(AVFrame*)s->current_picture_ptr;
1954 ff_print_debug_info(s, pict);
1955 } else {
1956 s->picture_number++;
1957 /* latency of 1 frame for I- and P-frames */
1958 /* XXX: use another variable than picture_number */
1959 if (s->last_picture_ptr != NULL) {
1960 *pict= *(AVFrame*)s->last_picture_ptr;
1961 ff_print_debug_info(s, pict);
1962 }
1963 }
1964
1965 return 1;
1966 } else {
1967 return 0;
1968 }
1969 }
1970
1971 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1972 const uint8_t *buf, int buf_size)
1973 {
1974 Mpeg1Context *s1 = avctx->priv_data;
1975 MpegEncContext *s = &s1->mpeg_enc_ctx;
1976 int width,height;
1977 int i, v, j;
1978
1979 init_get_bits(&s->gb, buf, buf_size*8);
1980
1981 width = get_bits(&s->gb, 12);
1982 height = get_bits(&s->gb, 12);
1983 if (width <= 0 || height <= 0)
1984 return -1;
1985 s->aspect_ratio_info= get_bits(&s->gb, 4);
1986 if (s->aspect_ratio_info == 0) {
1987 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1988 if (avctx->error_recognition >= FF_ER_COMPLIANT)
1989 return -1;
1990 }
1991 s->frame_rate_index = get_bits(&s->gb, 4);
1992 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1993 return -1;
1994 s->bit_rate = get_bits(&s->gb, 18) * 400;
1995 if (get_bits1(&s->gb) == 0) /* marker */
1996 return -1;
1997 s->width = width;
1998 s->height = height;
1999
2000 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2001 skip_bits(&s->gb, 1);
2002
2003 /* get matrix */
2004 if (get_bits1(&s->gb)) {
2005 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2006 } else {
2007 for(i=0;i<64;i++) {
2008 j = s->dsp.idct_permutation[i];
2009 v = ff_mpeg1_default_intra_matrix[i];
2010 s->intra_matrix[j] = v;
2011 s->chroma_intra_matrix[j] = v;
2012 }
2013 }
2014 if (get_bits1(&s->gb)) {
2015 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2016 } else {
2017 for(i=0;i<64;i++) {
2018 int j= s->dsp.idct_permutation[i];
2019 v = ff_mpeg1_default_non_intra_matrix[i];
2020 s->inter_matrix[j] = v;
2021 s->chroma_inter_matrix[j] = v;
2022 }
2023 }
2024
2025 if(show_bits(&s->gb, 23) != 0){
2026 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2027 return -1;
2028 }
2029
2030 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2031 s->progressive_sequence = 1;
2032 s->progressive_frame = 1;
2033 s->picture_structure = PICT_FRAME;
2034 s->frame_pred_frame_dct = 1;
2035 s->chroma_format = 1;
2036 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2037 avctx->sub_id = 1; /* indicates MPEG-1 */
2038 s->out_format = FMT_MPEG1;
2039 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2040 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2041
2042 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2043 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2044 s->avctx->rc_buffer_size, s->bit_rate);
2045
2046 return 0;
2047 }
2048
2049 static int vcr2_init_sequence(AVCodecContext *avctx)
2050 {
2051 Mpeg1Context *s1 = avctx->priv_data;
2052 MpegEncContext *s = &s1->mpeg_enc_ctx;
2053 int i, v;
2054
2055 /* start new MPEG-1 context decoding */
2056 s->out_format = FMT_MPEG1;
2057 if (s1->mpeg_enc_ctx_allocated) {
2058 MPV_common_end(s);
2059 }
2060 s->width = avctx->coded_width;
2061 s->height = avctx->coded_height;
2062 avctx->has_b_frames= 0; //true?
2063 s->low_delay= 1;
2064
2065 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2066 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2067
2068 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2069 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2070 if( avctx->idct_algo == FF_IDCT_AUTO )
2071 avctx->idct_algo = FF_IDCT_SIMPLE;
2072
2073 if (MPV_common_init(s) < 0)
2074 return -1;
2075 exchange_uv(s);//common init reset pblocks, so we swap them here
2076 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2077 s1->mpeg_enc_ctx_allocated = 1;
2078
2079 for(i=0;i<64;i++) {
2080 int j= s->dsp.idct_permutation[i];
2081 v = ff_mpeg1_default_intra_matrix[i];
2082 s->intra_matrix[j] = v;
2083 s->chroma_intra_matrix[j] = v;
2084
2085 v = ff_mpeg1_default_non_intra_matrix[i];
2086 s->inter_matrix[j] = v;
2087 s->chroma_inter_matrix[j] = v;
2088 }
2089
2090 s->progressive_sequence = 1;
2091 s->progressive_frame = 1;
2092 s->picture_structure = PICT_FRAME;
2093 s->frame_pred_frame_dct = 1;
2094 s->chroma_format = 1;
2095 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2096 avctx->sub_id = 2; /* indicates MPEG-2 */
2097 s1->save_width = s->width;
2098 s1->save_height = s->height;
2099 s1->save_progressive_seq = s->progressive_sequence;
2100 return 0;
2101 }
2102
2103
2104 static void mpeg_decode_user_data(AVCodecContext *avctx,
2105 const uint8_t *p, int buf_size)
2106 {
2107 const uint8_t *buf_end = p+buf_size;
2108
2109 /* we parse the DTG active format information */
2110 if (buf_end - p >= 5 &&
2111 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2112 int flags = p[4];
2113 p += 5;
2114 if (flags & 0x80) {
2115 /* skip event id */
2116 p += 2;
2117 }
2118 if (flags & 0x40) {
2119 if (buf_end - p < 1)
2120 return;
2121 avctx->dtg_active_format = p[0] & 0x0f;
2122 }
2123 }
2124 }
2125
2126 static void mpeg_decode_gop(AVCodecContext *avctx,
2127 const uint8_t *buf, int buf_size){
2128 Mpeg1Context *s1 = avctx->priv_data;
2129 MpegEncContext *s = &s1->mpeg_enc_ctx;
2130
2131 int drop_frame_flag;
2132 int time_code_hours, time_code_minutes;
2133 int time_code_seconds, time_code_pictures;
2134 int broken_link;
2135
2136 init_get_bits(&s->gb, buf, buf_size*8);
2137
2138 drop_frame_flag = get_bits1(&s->gb);
2139
2140 time_code_hours=get_bits(&s->gb,5);
2141 time_code_minutes = get_bits(&s->gb,6);
2142 skip_bits1(&s->gb);//marker bit
2143 time_code_seconds = get_bits(&s->gb,6);
2144 time_code_pictures = get_bits(&s->gb,6);
2145
2146 s->closed_gop = get_bits1(&s->gb);
2147 /*broken_link indicate that after editing the
2148 reference frames of the first B-Frames after GOP I-Frame
2149 are missing (open gop)*/
2150 broken_link = get_bits1(&s->gb);
2151
2152 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2153 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2154 time_code_hours, time_code_minutes, time_code_seconds,
2155 time_code_pictures, s->closed_gop, broken_link);
2156 }
2157 /**
2158 * Find the end of the current frame in the bitstream.
2159 * @return the position of the first byte of the next frame, or -1
2160 */
2161 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2162 {
2163 int i;
2164 uint32_t state= pc->state;
2165
2166 /* EOF considered as end of frame */
2167 if (buf_size == 0)
2168 return 0;
2169
2170 /*
2171 0 frame start -> 1/4
2172 1 first_SEQEXT -> 0/2
2173 2 first field start -> 3/0
2174 3 second_SEQEXT -> 2/0
2175 4 searching end
2176 */
2177
2178 for(i=0; i<buf_size; i++){
2179 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2180 if(pc->frame_start_found&1){
2181 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2182 pc->frame_start_found--;
2183 else if(state == EXT_START_CODE+2){
2184 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2185 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2186 }
2187 state++;
2188 }else{
2189 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2190 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2191 i++;
2192 pc->frame_start_found=4;
2193 }
2194 if(state == SEQ_END_CODE){
2195 pc->state=-1;
2196 return i+1;
2197 }
2198 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2199 pc->frame_start_found= 0;
2200 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2201 pc->frame_start_found++;
2202 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2203 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2204 pc->frame_start_found=0;
2205 pc->state=-1;
2206 return i-3;
2207 }
2208 }
2209 if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2210 ff_fetch_timestamp(s, i-3, 1);
2211 }
2212 }
2213 }
2214 pc->state= state;
2215 return END_NOT_FOUND;
2216 }
2217
2218 static int decode_chunks(AVCodecContext *avctx,
2219 AVFrame *picture, int *data_size,
2220 const uint8_t *buf, int buf_size);
2221
2222 /* handle buffering and image synchronisation */
2223 static int mpeg_decode_frame(AVCodecContext *avctx,
2224 void *data, int *data_size,
2225 AVPacket *avpkt)
2226 {
2227 const uint8_t *buf = avpkt->data;
2228 int buf_size = avpkt->size;
2229 Mpeg1Context *s = avctx->priv_data;
2230 AVFrame *picture = data;
2231 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2232 dprintf(avctx, "fill_buffer\n");
2233
2234 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2235 /* special case for last picture */
2236 if (s2->low_delay==0 && s2->next_picture_ptr) {
2237 *picture= *(AVFrame*)s2->next_picture_ptr;
2238 s2->next_picture_ptr= NULL;
2239
2240 *data_size = sizeof(AVFrame);
2241 }
2242 return buf_size;
2243 }
2244
2245 if(s2->flags&CODEC_FLAG_TRUNCATED){
2246 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2247
2248 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2249 return buf_size;
2250 }
2251
2252 #if 0
2253 if (s->repeat_field % 2 == 1) {
2254 s->repeat_field++;
2255 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2256 // s2->picture_number, s->repeat_field);
2257 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2258 *data_size = sizeof(AVPicture);
2259 goto the_end;
2260 }
2261 }
2262 #endif
2263
2264 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2265 vcr2_init_sequence(avctx);
2266
2267 s->slice_count= 0;
2268
2269 if(avctx->extradata && !avctx->frame_number)
2270 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2271
2272 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2273 }
2274
2275 static int decode_chunks(AVCodecContext *avctx,
2276 AVFrame *picture, int *data_size,
2277 const uint8_t *buf, int buf_size)
2278 {
2279 Mpeg1Context *s = avctx->priv_data;
2280 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2281 const uint8_t *buf_ptr = buf;
2282 const uint8_t *buf_end = buf + buf_size;
2283 int ret, input_size;
2284 int last_code= 0;
2285
2286 for(;;) {
2287 /* find next start code */
2288 uint32_t start_code = -1;
2289 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2290 if (start_code > 0x1ff){
2291 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2292 if(avctx->thread_count > 1){
2293 int i;
2294
2295 avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2296 for(i=0; i<s->slice_count; i++)
2297 s2->error_count += s2->thread_context[i]->error_count;
2298 }
2299
2300 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2301 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2302
2303 if (slice_end(avctx, picture)) {
2304 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2305 *data_size = sizeof(AVPicture);
2306 }
2307 }
2308 s2->pict_type= 0;
2309 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2310 }
2311
2312 input_size = buf_end - buf_ptr;
2313
2314 if(avctx->debug & FF_DEBUG_STARTCODE){
2315 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2316 }
2317
2318 /* prepare data for next start code */
2319 switch(start_code) {
2320 case SEQ_START_CODE:
2321 if(last_code == 0){
2322 mpeg1_decode_sequence(avctx, buf_ptr,
2323 input_size);
2324 s->sync=1;
2325 }else{
2326 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2327 }
2328 break;
2329
2330 case PICTURE_START_CODE:
2331 if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2332 if(mpeg_decode_postinit(avctx) < 0){
2333 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2334 return -1;
2335 }
2336
2337 /* we have a complete image: we try to decompress it */
2338 if(mpeg1_decode_picture(avctx,
2339 buf_ptr, input_size) < 0)
2340 s2->pict_type=0;
2341 s2->first_slice = 1;
2342 last_code= PICTURE_START_CODE;
2343 }else{
2344 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2345 }
2346 break;
2347 case EXT_START_CODE:
2348 init_get_bits(&s2->gb, buf_ptr, input_size*8);
2349
2350 switch(get_bits(&s2->gb, 4)) {
2351 case 0x1:
2352 if(last_code == 0){
2353 mpeg_decode_sequence_extension(s);
2354 }else{
2355 av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2356 }
2357 break;
2358 case 0x2:
2359 mpeg_decode_sequence_display_extension(s);
2360 break;
2361 case 0x3:
2362 mpeg_decode_quant_matrix_extension(s2);
2363 break;
2364 case 0x7:
2365 mpeg_decode_picture_display_extension(s);
2366 break;
2367 case 0x8:
2368 if(last_code == PICTURE_START_CODE){
2369 mpeg_decode_picture_coding_extension(s);
2370 }else{
2371 av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2372 }
2373 break;
2374 }
2375 break;
2376 case USER_START_CODE:
2377 mpeg_decode_user_data(avctx,
2378 buf_ptr, input_size);
2379 break;
2380 case GOP_START_CODE:
2381 if(last_code == 0){
2382 s2->first_field=0;
2383 mpeg_decode_gop(avctx,
2384 buf_ptr, input_size);
2385 s->sync=1;
2386 }else{
2387 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2388 }
2389 break;
2390 default:
2391 if (start_code >= SLICE_MIN_START_CODE &&
2392 start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2393 const int field_pic= s2->picture_structure != PICT_FRAME;
2394 int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2395 last_code= SLICE_MIN_START_CODE;
2396
2397 if(s2->picture_structure == PICT_BOTTOM_FIELD)
2398 mb_y++;
2399
2400 if (mb_y >= s2->mb_height){
2401 av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2402 return -1;
2403 }
2404
2405 if(s2->last_picture_ptr==NULL){
2406 /* Skip B-frames if we do not have reference frames and gop is not closed */
2407 if(s2->pict_type==FF_B_TYPE){
2408 if(!s2->closed_gop)
2409 break;
2410 }
2411 }
2412 if(s2->pict_type==FF_I_TYPE)
2413 s->sync=1;
2414 if(s2->next_picture_ptr==NULL){
2415 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2416 if(s2->pict_type==FF_P_TYPE && !s->sync) break;
2417 }
2418 /* Skip B-frames if we are in a hurry. */
2419 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2420 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2421 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2422 || avctx->skip_frame >= AVDISCARD_ALL)
2423 break;
2424 /* Skip everything if we are in a hurry>=5. */
2425 if(avctx->hurry_up>=5) break;
2426
2427 if (!s->mpeg_enc_ctx_allocated) break;
2428
2429 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2430 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2431 break;
2432 }
2433
2434 if(!s2->pict_type){
2435 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2436 break;
2437 }
2438
2439 if(s2->first_slice){
2440 s2->first_slice=0;
2441 if(mpeg_field_start(s2, buf, buf_size) < 0)
2442 return -1;
2443 }
2444 if(!s2->current_picture_ptr){
2445 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2446 return -1;
2447 }
2448
2449 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2450 s->slice_count++;
2451 break;
2452 }
2453
2454 if(avctx->thread_count > 1){
2455 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2456 if(threshold <= mb_y){
2457 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2458
2459 thread_context->start_mb_y= mb_y;
2460 thread_context->end_mb_y = s2->mb_height;
2461 if(s->slice_count){
2462 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2463 ff_update_duplicate_context(thread_context, s2);
2464 }
2465 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2466 s->slice_count++;
2467 }
2468 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2469 }else{
2470 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2471 emms_c();
2472
2473 if(ret < 0){
2474 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2475 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
2476 }else{
2477 ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
2478 }
2479 }
2480 }
2481 break;
2482 }
2483 }
2484 }
2485
2486 static void flush(AVCodecContext *avctx){
2487 Mpeg1Context *s = avctx->priv_data;
2488
2489 s->sync=0;
2490
2491 ff_mpeg_flush(avctx);
2492 }
2493
2494 static int mpeg_decode_end(AVCodecContext *avctx)
2495 {
2496 Mpeg1Context *s = avctx->priv_data;
2497
2498 if (s->mpeg_enc_ctx_allocated)
2499 MPV_common_end(&s->mpeg_enc_ctx);
2500 return 0;
2501 }
2502
2503 AVCodec mpeg1video_decoder = {
2504 "mpeg1video",
2505 AVMEDIA_TYPE_VIDEO,
2506 CODEC_ID_MPEG1VIDEO,
2507 sizeof(Mpeg1Context),
2508 mpeg_decode_init,
2509 NULL,
2510 mpeg_decode_end,
2511 mpeg_decode_frame,
2512 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2513 .flush= flush,
2514 .max_lowres= 3,
2515 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2516 };
2517
2518 AVCodec mpeg2video_decoder = {
2519 "mpeg2video",
2520 AVMEDIA_TYPE_VIDEO,
2521 CODEC_ID_MPEG2VIDEO,
2522 sizeof(Mpeg1Context),
2523 mpeg_decode_init,
2524 NULL,
2525 mpeg_decode_end,
2526 mpeg_decode_frame,
2527 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2528 .flush= flush,
2529 .max_lowres= 3,
2530 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2531 };
2532
2533 //legacy decoder
2534 AVCodec mpegvideo_decoder = {
2535 "mpegvideo",
2536 AVMEDIA_TYPE_VIDEO,
2537 CODEC_ID_MPEG2VIDEO,
2538 sizeof(Mpeg1Context),
2539 mpeg_decode_init,
2540 NULL,
2541 mpeg_decode_end,
2542 mpeg_decode_frame,
2543 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2544 .flush= flush,
2545 .max_lowres= 3,
2546 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2547 };
2548
2549 #if CONFIG_MPEG_XVMC_DECODER
2550 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2551 if( avctx->thread_count > 1)
2552 return -1;
2553 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2554 return -1;
2555 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2556 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2557 }
2558 mpeg_decode_init(avctx);
2559
2560 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2561 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2562
2563 return 0;
2564 }
2565
2566 AVCodec mpeg_xvmc_decoder = {
2567 "mpegvideo_xvmc",
2568 AVMEDIA_TYPE_VIDEO,
2569 CODEC_ID_MPEG2VIDEO_XVMC,
2570 sizeof(Mpeg1Context),
2571 mpeg_mc_decode_init,
2572 NULL,
2573 mpeg_decode_end,
2574 mpeg_decode_frame,
2575 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2576 .flush= flush,
2577 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2578 };
2579
2580 #endif
2581
2582 #if CONFIG_MPEG_VDPAU_DECODER
2583 AVCodec mpeg_vdpau_decoder = {
2584 "mpegvideo_vdpau",
2585 AVMEDIA_TYPE_VIDEO,
2586 CODEC_ID_MPEG2VIDEO,
2587 sizeof(Mpeg1Context),
2588 mpeg_decode_init,
2589 NULL,
2590 mpeg_decode_end,
2591 mpeg_decode_frame,
2592 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2593 .flush= flush,
2594 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2595 };
2596 #endif
2597
2598 #if CONFIG_MPEG1_VDPAU_DECODER
2599 AVCodec mpeg1_vdpau_decoder = {
2600 "mpeg1video_vdpau",
2601 AVMEDIA_TYPE_VIDEO,
2602 CODEC_ID_MPEG1VIDEO,
2603 sizeof(Mpeg1Context),
2604 mpeg_decode_init,
2605 NULL,
2606 mpeg_decode_end,
2607 mpeg_decode_frame,
2608 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2609 .flush= flush,
2610 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2611 };
2612 #endif
2613