059083277aecf7f2bcb0aa77c42216c895055bb2
[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 Libav.
7 *
8 * Libav 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 * Libav 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 Libav; 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 #include "thread.h"
41
42 //#undef NDEBUG
43 //#include <assert.h>
44
45
46 #define MV_VLC_BITS 9
47 #define MBINCR_VLC_BITS 9
48 #define MB_PAT_VLC_BITS 9
49 #define MB_PTYPE_VLC_BITS 6
50 #define MB_BTYPE_VLC_BITS 6
51
52 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
53 DCTELEM *block,
54 int n);
55 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
56 DCTELEM *block,
57 int n);
58 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
59 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
60 DCTELEM *block,
61 int n);
62 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
63 DCTELEM *block,
64 int n);
65 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
66 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
67 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
68 static void exchange_uv(MpegEncContext *s);
69
70 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
71 PIX_FMT_XVMC_MPEG2_IDCT,
72 PIX_FMT_XVMC_MPEG2_MC,
73 PIX_FMT_NONE};
74
75 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
76
77
78 #define INIT_2D_VLC_RL(rl, static_size)\
79 {\
80 static RL_VLC_ELEM rl_vlc_table[static_size];\
81 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
82 &rl.table_vlc[0][1], 4, 2,\
83 &rl.table_vlc[0][0], 4, 2, static_size);\
84 \
85 rl.rl_vlc[0]= rl_vlc_table;\
86 init_2d_vlc_rl(&rl);\
87 }
88
89 static void init_2d_vlc_rl(RLTable *rl)
90 {
91 int i;
92
93 for(i=0; i<rl->vlc.table_size; i++){
94 int code= rl->vlc.table[i][0];
95 int len = rl->vlc.table[i][1];
96 int level, run;
97
98 if(len==0){ // illegal code
99 run= 65;
100 level= MAX_LEVEL;
101 }else if(len<0){ //more bits needed
102 run= 0;
103 level= code;
104 }else{
105 if(code==rl->n){ //esc
106 run= 65;
107 level= 0;
108 }else if(code==rl->n+1){ //eob
109 run= 0;
110 level= 127;
111 }else{
112 run= rl->table_run [code] + 1;
113 level= rl->table_level[code];
114 }
115 }
116 rl->rl_vlc[0][i].len= len;
117 rl->rl_vlc[0][i].level= level;
118 rl->rl_vlc[0][i].run= run;
119 }
120 }
121
122 void ff_mpeg12_common_init(MpegEncContext *s)
123 {
124
125 s->y_dc_scale_table=
126 s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
127
128 }
129
130 void ff_mpeg1_clean_buffers(MpegEncContext *s){
131 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
132 s->last_dc[1] = s->last_dc[0];
133 s->last_dc[2] = s->last_dc[0];
134 memset(s->last_mv, 0, sizeof(s->last_mv));
135 }
136
137
138 /******************************************/
139 /* decoding */
140
141 VLC ff_dc_lum_vlc;
142 VLC ff_dc_chroma_vlc;
143
144 static VLC mv_vlc;
145 static VLC mbincr_vlc;
146 static VLC mb_ptype_vlc;
147 static VLC mb_btype_vlc;
148 static VLC mb_pat_vlc;
149
150 av_cold void ff_mpeg12_init_vlcs(void)
151 {
152 static int done = 0;
153
154 if (!done) {
155 done = 1;
156
157 INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
158 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
159 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
160 INIT_VLC_STATIC(&ff_dc_chroma_vlc, DC_VLC_BITS, 12,
161 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
162 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
163 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
164 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
165 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
166 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
167 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
168 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
169 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
170 &ff_mpeg12_mbPatTable[0][1], 2, 1,
171 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
172
173 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
174 &table_mb_ptype[0][1], 2, 1,
175 &table_mb_ptype[0][0], 2, 1, 64);
176 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
177 &table_mb_btype[0][1], 2, 1,
178 &table_mb_btype[0][0], 2, 1, 64);
179 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
180 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
181
182 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
183 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
184 }
185 }
186
187 static inline int get_dmv(MpegEncContext *s)
188 {
189 if(get_bits1(&s->gb))
190 return 1 - (get_bits1(&s->gb) << 1);
191 else
192 return 0;
193 }
194
195 static inline int get_qscale(MpegEncContext *s)
196 {
197 int qscale = get_bits(&s->gb, 5);
198 if (s->q_scale_type) {
199 return non_linear_qscale[qscale];
200 } else {
201 return qscale << 1;
202 }
203 }
204
205 /* motion type (for MPEG-2) */
206 #define MT_FIELD 1
207 #define MT_FRAME 2
208 #define MT_16X8 2
209 #define MT_DMV 3
210
211 static int mpeg_decode_mb(MpegEncContext *s,
212 DCTELEM block[12][64])
213 {
214 int i, j, k, cbp, val, mb_type, motion_type;
215 const int mb_block_count = 4 + (1<< s->chroma_format);
216
217 av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
218
219 assert(s->mb_skipped==0);
220
221 if (s->mb_skip_run-- != 0) {
222 if (s->pict_type == AV_PICTURE_TYPE_P) {
223 s->mb_skipped = 1;
224 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
225 } else {
226 int mb_type;
227
228 if(s->mb_x)
229 mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
230 else
231 mb_type = s->current_picture.f.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
232 if(IS_INTRA(mb_type))
233 return -1;
234
235 s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
236 mb_type | MB_TYPE_SKIP;
237 // assert(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
238
239 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
240 s->mb_skipped = 1;
241 }
242
243 return 0;
244 }
245
246 switch(s->pict_type) {
247 default:
248 case AV_PICTURE_TYPE_I:
249 if (get_bits1(&s->gb) == 0) {
250 if (get_bits1(&s->gb) == 0){
251 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
252 return -1;
253 }
254 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
255 } else {
256 mb_type = MB_TYPE_INTRA;
257 }
258 break;
259 case AV_PICTURE_TYPE_P:
260 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
261 if (mb_type < 0){
262 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
263 return -1;
264 }
265 mb_type = ptype2mb_type[ mb_type ];
266 break;
267 case AV_PICTURE_TYPE_B:
268 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
269 if (mb_type < 0){
270 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
271 return -1;
272 }
273 mb_type = btype2mb_type[ mb_type ];
274 break;
275 }
276 av_dlog(s->avctx, "mb_type=%x\n", mb_type);
277 // motion_type = 0; /* avoid warning */
278 if (IS_INTRA(mb_type)) {
279 s->dsp.clear_blocks(s->block[0]);
280
281 if(!s->chroma_y_shift){
282 s->dsp.clear_blocks(s->block[6]);
283 }
284
285 /* compute DCT type */
286 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
287 !s->frame_pred_frame_dct) {
288 s->interlaced_dct = get_bits1(&s->gb);
289 }
290
291 if (IS_QUANT(mb_type))
292 s->qscale = get_qscale(s);
293
294 if (s->concealment_motion_vectors) {
295 /* just parse them */
296 if (s->picture_structure != PICT_FRAME)
297 skip_bits1(&s->gb); /* field select */
298
299 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
300 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
301 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
302 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
303
304 skip_bits1(&s->gb); /* marker */
305 }else
306 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
307 s->mb_intra = 1;
308 //if 1, we memcpy blocks in xvmcvideo
309 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
310 ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
311 if(s->swap_uv){
312 exchange_uv(s);
313 }
314 }
315
316 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
317 if(s->flags2 & CODEC_FLAG2_FAST){
318 for(i=0;i<6;i++) {
319 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
320 }
321 }else{
322 for(i=0;i<mb_block_count;i++) {
323 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
324 return -1;
325 }
326 }
327 } else {
328 for(i=0;i<6;i++) {
329 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
330 return -1;
331 }
332 }
333 } else {
334 if (mb_type & MB_TYPE_ZERO_MV){
335 assert(mb_type & MB_TYPE_CBP);
336
337 s->mv_dir = MV_DIR_FORWARD;
338 if(s->picture_structure == PICT_FRAME){
339 if(!s->frame_pred_frame_dct)
340 s->interlaced_dct = get_bits1(&s->gb);
341 s->mv_type = MV_TYPE_16X16;
342 }else{
343 s->mv_type = MV_TYPE_FIELD;
344 mb_type |= MB_TYPE_INTERLACED;
345 s->field_select[0][0]= s->picture_structure - 1;
346 }
347
348 if (IS_QUANT(mb_type))
349 s->qscale = get_qscale(s);
350
351 s->last_mv[0][0][0] = 0;
352 s->last_mv[0][0][1] = 0;
353 s->last_mv[0][1][0] = 0;
354 s->last_mv[0][1][1] = 0;
355 s->mv[0][0][0] = 0;
356 s->mv[0][0][1] = 0;
357 }else{
358 assert(mb_type & MB_TYPE_L0L1);
359 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
360 /* get additional motion vector type */
361 if (s->frame_pred_frame_dct)
362 motion_type = MT_FRAME;
363 else{
364 motion_type = get_bits(&s->gb, 2);
365 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
366 s->interlaced_dct = get_bits1(&s->gb);
367 }
368
369 if (IS_QUANT(mb_type))
370 s->qscale = get_qscale(s);
371
372 /* motion vectors */
373 s->mv_dir= (mb_type>>13)&3;
374 av_dlog(s->avctx, "motion_type=%d\n", motion_type);
375 switch(motion_type) {
376 case MT_FRAME: /* or MT_16X8 */
377 if (s->picture_structure == PICT_FRAME) {
378 mb_type |= MB_TYPE_16x16;
379 s->mv_type = MV_TYPE_16X16;
380 for(i=0;i<2;i++) {
381 if (USES_LIST(mb_type, i)) {
382 /* MT_FRAME */
383 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
384 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
385 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
386 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
387 /* full_pel: only for MPEG-1 */
388 if (s->full_pel[i]){
389 s->mv[i][0][0] <<= 1;
390 s->mv[i][0][1] <<= 1;
391 }
392 }
393 }
394 } else {
395 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
396 s->mv_type = MV_TYPE_16X8;
397 for(i=0;i<2;i++) {
398 if (USES_LIST(mb_type, i)) {
399 /* MT_16X8 */
400 for(j=0;j<2;j++) {
401 s->field_select[i][j] = get_bits1(&s->gb);
402 for(k=0;k<2;k++) {
403 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
404 s->last_mv[i][j][k]);
405 s->last_mv[i][j][k] = val;
406 s->mv[i][j][k] = val;
407 }
408 }
409 }
410 }
411 }
412 break;
413 case MT_FIELD:
414 s->mv_type = MV_TYPE_FIELD;
415 if (s->picture_structure == PICT_FRAME) {
416 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
417 for(i=0;i<2;i++) {
418 if (USES_LIST(mb_type, i)) {
419 for(j=0;j<2;j++) {
420 s->field_select[i][j] = get_bits1(&s->gb);
421 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
422 s->last_mv[i][j][0]);
423 s->last_mv[i][j][0] = val;
424 s->mv[i][j][0] = val;
425 av_dlog(s->avctx, "fmx=%d\n", val);
426 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
427 s->last_mv[i][j][1] >> 1);
428 s->last_mv[i][j][1] = val << 1;
429 s->mv[i][j][1] = val;
430 av_dlog(s->avctx, "fmy=%d\n", val);
431 }
432 }
433 }
434 } else {
435 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
436 for(i=0;i<2;i++) {
437 if (USES_LIST(mb_type, i)) {
438 s->field_select[i][0] = get_bits1(&s->gb);
439 for(k=0;k<2;k++) {
440 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
441 s->last_mv[i][0][k]);
442 s->last_mv[i][0][k] = val;
443 s->last_mv[i][1][k] = val;
444 s->mv[i][0][k] = val;
445 }
446 }
447 }
448 }
449 break;
450 case MT_DMV:
451 s->mv_type = MV_TYPE_DMV;
452 for(i=0;i<2;i++) {
453 if (USES_LIST(mb_type, i)) {
454 int dmx, dmy, mx, my, m;
455 const int my_shift= s->picture_structure == PICT_FRAME;
456
457 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
458 s->last_mv[i][0][0]);
459 s->last_mv[i][0][0] = mx;
460 s->last_mv[i][1][0] = mx;
461 dmx = get_dmv(s);
462 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
463 s->last_mv[i][0][1] >> my_shift);
464 dmy = get_dmv(s);
465
466
467 s->last_mv[i][0][1] = my<<my_shift;
468 s->last_mv[i][1][1] = my<<my_shift;
469
470 s->mv[i][0][0] = mx;
471 s->mv[i][0][1] = my;
472 s->mv[i][1][0] = mx;//not used
473 s->mv[i][1][1] = my;//not used
474
475 if (s->picture_structure == PICT_FRAME) {
476 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
477
478 //m = 1 + 2 * s->top_field_first;
479 m = s->top_field_first ? 1 : 3;
480
481 /* top -> top pred */
482 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
483 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
484 m = 4 - m;
485 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
486 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
487 } else {
488 mb_type |= MB_TYPE_16x16;
489
490 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
491 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
492 if(s->picture_structure == PICT_TOP_FIELD)
493 s->mv[i][2][1]--;
494 else
495 s->mv[i][2][1]++;
496 }
497 }
498 }
499 break;
500 default:
501 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
502 return -1;
503 }
504 }
505
506 s->mb_intra = 0;
507 if (HAS_CBP(mb_type)) {
508 s->dsp.clear_blocks(s->block[0]);
509
510 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
511 if(mb_block_count > 6){
512 cbp<<= mb_block_count-6;
513 cbp |= get_bits(&s->gb, mb_block_count-6);
514 s->dsp.clear_blocks(s->block[6]);
515 }
516 if (cbp <= 0){
517 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
518 return -1;
519 }
520
521 //if 1, we memcpy blocks in xvmcvideo
522 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
523 ff_xvmc_pack_pblocks(s,cbp);
524 if(s->swap_uv){
525 exchange_uv(s);
526 }
527 }
528
529 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
530 if(s->flags2 & CODEC_FLAG2_FAST){
531 for(i=0;i<6;i++) {
532 if(cbp & 32) {
533 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
534 } else {
535 s->block_last_index[i] = -1;
536 }
537 cbp+=cbp;
538 }
539 }else{
540 cbp<<= 12-mb_block_count;
541
542 for(i=0;i<mb_block_count;i++) {
543 if ( cbp & (1<<11) ) {
544 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
545 return -1;
546 } else {
547 s->block_last_index[i] = -1;
548 }
549 cbp+=cbp;
550 }
551 }
552 } else {
553 if(s->flags2 & CODEC_FLAG2_FAST){
554 for(i=0;i<6;i++) {
555 if (cbp & 32) {
556 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
557 } else {
558 s->block_last_index[i] = -1;
559 }
560 cbp+=cbp;
561 }
562 }else{
563 for(i=0;i<6;i++) {
564 if (cbp & 32) {
565 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
566 return -1;
567 } else {
568 s->block_last_index[i] = -1;
569 }
570 cbp+=cbp;
571 }
572 }
573 }
574 }else{
575 for(i=0;i<12;i++)
576 s->block_last_index[i] = -1;
577 }
578 }
579
580 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
581
582 return 0;
583 }
584
585 /* as H.263, but only 17 codes */
586 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
587 {
588 int code, sign, val, l, shift;
589
590 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
591 if (code == 0) {
592 return pred;
593 }
594 if (code < 0) {
595 return 0xffff;
596 }
597
598 sign = get_bits1(&s->gb);
599 shift = fcode - 1;
600 val = code;
601 if (shift) {
602 val = (val - 1) << shift;
603 val |= get_bits(&s->gb, shift);
604 val++;
605 }
606 if (sign)
607 val = -val;
608 val += pred;
609
610 /* modulo decoding */
611 l= INT_BIT - 5 - shift;
612 val = (val<<l)>>l;
613 return val;
614 }
615
616 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
617 DCTELEM *block,
618 int n)
619 {
620 int level, dc, diff, i, j, run;
621 int component;
622 RLTable *rl = &ff_rl_mpeg1;
623 uint8_t * const scantable= s->intra_scantable.permutated;
624 const uint16_t *quant_matrix= s->intra_matrix;
625 const int qscale= s->qscale;
626
627 /* DC coefficient */
628 component = (n <= 3 ? 0 : n - 4 + 1);
629 diff = decode_dc(&s->gb, component);
630 if (diff >= 0xffff)
631 return -1;
632 dc = s->last_dc[component];
633 dc += diff;
634 s->last_dc[component] = dc;
635 block[0] = dc*quant_matrix[0];
636 av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
637 i = 0;
638 {
639 OPEN_READER(re, &s->gb);
640 /* now quantify & encode AC coefficients */
641 for(;;) {
642 UPDATE_CACHE(re, &s->gb);
643 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
644
645 if(level == 127){
646 break;
647 } else if(level != 0) {
648 i += run;
649 j = scantable[i];
650 level= (level*qscale*quant_matrix[j])>>4;
651 level= (level-1)|1;
652 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
653 LAST_SKIP_BITS(re, &s->gb, 1);
654 } else {
655 /* escape */
656 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
657 UPDATE_CACHE(re, &s->gb);
658 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
659 if (level == -128) {
660 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
661 } else if (level == 0) {
662 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
663 }
664 i += run;
665 j = scantable[i];
666 if(level<0){
667 level= -level;
668 level= (level*qscale*quant_matrix[j])>>4;
669 level= (level-1)|1;
670 level= -level;
671 }else{
672 level= (level*qscale*quant_matrix[j])>>4;
673 level= (level-1)|1;
674 }
675 }
676 if (i > 63){
677 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
678 return -1;
679 }
680
681 block[j] = level;
682 }
683 CLOSE_READER(re, &s->gb);
684 }
685 s->block_last_index[n] = i;
686 return 0;
687 }
688
689 int ff_mpeg1_decode_block_intra(MpegEncContext *s,
690 DCTELEM *block,
691 int n)
692 {
693 return mpeg1_decode_block_intra(s, block, n);
694 }
695
696 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
697 DCTELEM *block,
698 int n)
699 {
700 int level, i, j, run;
701 RLTable *rl = &ff_rl_mpeg1;
702 uint8_t * const scantable= s->intra_scantable.permutated;
703 const uint16_t *quant_matrix= s->inter_matrix;
704 const int qscale= s->qscale;
705
706 {
707 OPEN_READER(re, &s->gb);
708 i = -1;
709 // special case for first coefficient, no need to add second VLC table
710 UPDATE_CACHE(re, &s->gb);
711 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
712 level= (3*qscale*quant_matrix[0])>>5;
713 level= (level-1)|1;
714 if(GET_CACHE(re, &s->gb)&0x40000000)
715 level= -level;
716 block[0] = level;
717 i++;
718 SKIP_BITS(re, &s->gb, 2);
719 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
720 goto end;
721 }
722 /* now quantify & encode AC coefficients */
723 for(;;) {
724 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
725
726 if(level != 0) {
727 i += run;
728 j = scantable[i];
729 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
730 level= (level-1)|1;
731 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
732 SKIP_BITS(re, &s->gb, 1);
733 } else {
734 /* escape */
735 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
736 UPDATE_CACHE(re, &s->gb);
737 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
738 if (level == -128) {
739 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
740 } else if (level == 0) {
741 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
742 }
743 i += run;
744 j = scantable[i];
745 if(level<0){
746 level= -level;
747 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
748 level= (level-1)|1;
749 level= -level;
750 }else{
751 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
752 level= (level-1)|1;
753 }
754 }
755 if (i > 63){
756 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
757 return -1;
758 }
759
760 block[j] = level;
761 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
762 break;
763 UPDATE_CACHE(re, &s->gb);
764 }
765 end:
766 LAST_SKIP_BITS(re, &s->gb, 2);
767 CLOSE_READER(re, &s->gb);
768 }
769 s->block_last_index[n] = i;
770 return 0;
771 }
772
773 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
774 {
775 int level, i, j, run;
776 RLTable *rl = &ff_rl_mpeg1;
777 uint8_t * const scantable= s->intra_scantable.permutated;
778 const int qscale= s->qscale;
779
780 {
781 OPEN_READER(re, &s->gb);
782 i = -1;
783 // special case for first coefficient, no need to add second VLC table
784 UPDATE_CACHE(re, &s->gb);
785 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
786 level= (3*qscale)>>1;
787 level= (level-1)|1;
788 if(GET_CACHE(re, &s->gb)&0x40000000)
789 level= -level;
790 block[0] = level;
791 i++;
792 SKIP_BITS(re, &s->gb, 2);
793 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
794 goto end;
795 }
796
797 /* now quantify & encode AC coefficients */
798 for(;;) {
799 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
800
801 if(level != 0) {
802 i += run;
803 j = scantable[i];
804 level= ((level*2+1)*qscale)>>1;
805 level= (level-1)|1;
806 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
807 SKIP_BITS(re, &s->gb, 1);
808 } else {
809 /* escape */
810 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
811 UPDATE_CACHE(re, &s->gb);
812 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
813 if (level == -128) {
814 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
815 } else if (level == 0) {
816 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
817 }
818 i += run;
819 j = scantable[i];
820 if(level<0){
821 level= -level;
822 level= ((level*2+1)*qscale)>>1;
823 level= (level-1)|1;
824 level= -level;
825 }else{
826 level= ((level*2+1)*qscale)>>1;
827 level= (level-1)|1;
828 }
829 }
830
831 block[j] = level;
832 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
833 break;
834 UPDATE_CACHE(re, &s->gb);
835 }
836 end:
837 LAST_SKIP_BITS(re, &s->gb, 2);
838 CLOSE_READER(re, &s->gb);
839 }
840 s->block_last_index[n] = i;
841 return 0;
842 }
843
844
845 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
846 DCTELEM *block,
847 int n)
848 {
849 int level, i, j, run;
850 RLTable *rl = &ff_rl_mpeg1;
851 uint8_t * const scantable= s->intra_scantable.permutated;
852 const uint16_t *quant_matrix;
853 const int qscale= s->qscale;
854 int mismatch;
855
856 mismatch = 1;
857
858 {
859 OPEN_READER(re, &s->gb);
860 i = -1;
861 if (n < 4)
862 quant_matrix = s->inter_matrix;
863 else
864 quant_matrix = s->chroma_inter_matrix;
865
866 // special case for first coefficient, no need to add second VLC table
867 UPDATE_CACHE(re, &s->gb);
868 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
869 level= (3*qscale*quant_matrix[0])>>5;
870 if(GET_CACHE(re, &s->gb)&0x40000000)
871 level= -level;
872 block[0] = level;
873 mismatch ^= level;
874 i++;
875 SKIP_BITS(re, &s->gb, 2);
876 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
877 goto end;
878 }
879
880 /* now quantify & encode AC coefficients */
881 for(;;) {
882 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
883
884 if(level != 0) {
885 i += run;
886 j = scantable[i];
887 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
888 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
889 SKIP_BITS(re, &s->gb, 1);
890 } else {
891 /* escape */
892 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
893 UPDATE_CACHE(re, &s->gb);
894 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
895
896 i += run;
897 j = scantable[i];
898 if(level<0){
899 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
900 level= -level;
901 }else{
902 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
903 }
904 }
905 if (i > 63){
906 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
907 return -1;
908 }
909
910 mismatch ^= level;
911 block[j] = level;
912 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
913 break;
914 UPDATE_CACHE(re, &s->gb);
915 }
916 end:
917 LAST_SKIP_BITS(re, &s->gb, 2);
918 CLOSE_READER(re, &s->gb);
919 }
920 block[63] ^= (mismatch & 1);
921
922 s->block_last_index[n] = i;
923 return 0;
924 }
925
926 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
927 DCTELEM *block,
928 int n)
929 {
930 int level, i, j, run;
931 RLTable *rl = &ff_rl_mpeg1;
932 uint8_t * const scantable= s->intra_scantable.permutated;
933 const int qscale= s->qscale;
934 OPEN_READER(re, &s->gb);
935 i = -1;
936
937 // special case for first coefficient, no need to add second VLC table
938 UPDATE_CACHE(re, &s->gb);
939 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
940 level= (3*qscale)>>1;
941 if(GET_CACHE(re, &s->gb)&0x40000000)
942 level= -level;
943 block[0] = level;
944 i++;
945 SKIP_BITS(re, &s->gb, 2);
946 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
947 goto end;
948 }
949
950 /* now quantify & encode AC coefficients */
951 for(;;) {
952 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
953
954 if(level != 0) {
955 i += run;
956 j = scantable[i];
957 level= ((level*2+1)*qscale)>>1;
958 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
959 SKIP_BITS(re, &s->gb, 1);
960 } else {
961 /* escape */
962 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
963 UPDATE_CACHE(re, &s->gb);
964 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
965
966 i += run;
967 j = scantable[i];
968 if(level<0){
969 level= ((-level*2+1)*qscale)>>1;
970 level= -level;
971 }else{
972 level= ((level*2+1)*qscale)>>1;
973 }
974 }
975
976 block[j] = level;
977 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
978 break;
979 UPDATE_CACHE(re, &s->gb);
980 }
981 end:
982 LAST_SKIP_BITS(re, &s->gb, 2);
983 CLOSE_READER(re, &s->gb);
984 s->block_last_index[n] = i;
985 return 0;
986 }
987
988
989 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
990 DCTELEM *block,
991 int n)
992 {
993 int level, dc, diff, i, j, run;
994 int component;
995 RLTable *rl;
996 uint8_t * const scantable= s->intra_scantable.permutated;
997 const uint16_t *quant_matrix;
998 const int qscale= s->qscale;
999 int mismatch;
1000
1001 /* DC coefficient */
1002 if (n < 4){
1003 quant_matrix = s->intra_matrix;
1004 component = 0;
1005 }else{
1006 quant_matrix = s->chroma_intra_matrix;
1007 component = (n&1) + 1;
1008 }
1009 diff = decode_dc(&s->gb, component);
1010 if (diff >= 0xffff)
1011 return -1;
1012 dc = s->last_dc[component];
1013 dc += diff;
1014 s->last_dc[component] = dc;
1015 block[0] = dc << (3 - s->intra_dc_precision);
1016 av_dlog(s->avctx, "dc=%d\n", block[0]);
1017 mismatch = block[0] ^ 1;
1018 i = 0;
1019 if (s->intra_vlc_format)
1020 rl = &ff_rl_mpeg2;
1021 else
1022 rl = &ff_rl_mpeg1;
1023
1024 {
1025 OPEN_READER(re, &s->gb);
1026 /* now quantify & encode AC coefficients */
1027 for(;;) {
1028 UPDATE_CACHE(re, &s->gb);
1029 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1030
1031 if(level == 127){
1032 break;
1033 } else if(level != 0) {
1034 i += run;
1035 j = scantable[i];
1036 level= (level*qscale*quant_matrix[j])>>4;
1037 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1038 LAST_SKIP_BITS(re, &s->gb, 1);
1039 } else {
1040 /* escape */
1041 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1042 UPDATE_CACHE(re, &s->gb);
1043 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1044 i += run;
1045 j = scantable[i];
1046 if(level<0){
1047 level= (-level*qscale*quant_matrix[j])>>4;
1048 level= -level;
1049 }else{
1050 level= (level*qscale*quant_matrix[j])>>4;
1051 }
1052 }
1053 if (i > 63){
1054 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1055 return -1;
1056 }
1057
1058 mismatch^= level;
1059 block[j] = level;
1060 }
1061 CLOSE_READER(re, &s->gb);
1062 }
1063 block[63]^= mismatch&1;
1064
1065 s->block_last_index[n] = i;
1066 return 0;
1067 }
1068
1069 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1070 DCTELEM *block,
1071 int n)
1072 {
1073 int level, dc, diff, j, run;
1074 int component;
1075 RLTable *rl;
1076 uint8_t * scantable= s->intra_scantable.permutated;
1077 const uint16_t *quant_matrix;
1078 const int qscale= s->qscale;
1079
1080 /* DC coefficient */
1081 if (n < 4){
1082 quant_matrix = s->intra_matrix;
1083 component = 0;
1084 }else{
1085 quant_matrix = s->chroma_intra_matrix;
1086 component = (n&1) + 1;
1087 }
1088 diff = decode_dc(&s->gb, component);
1089 if (diff >= 0xffff)
1090 return -1;
1091 dc = s->last_dc[component];
1092 dc += diff;
1093 s->last_dc[component] = dc;
1094 block[0] = dc << (3 - s->intra_dc_precision);
1095 if (s->intra_vlc_format)
1096 rl = &ff_rl_mpeg2;
1097 else
1098 rl = &ff_rl_mpeg1;
1099
1100 {
1101 OPEN_READER(re, &s->gb);
1102 /* now quantify & encode AC coefficients */
1103 for(;;) {
1104 UPDATE_CACHE(re, &s->gb);
1105 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1106
1107 if(level == 127){
1108 break;
1109 } else if(level != 0) {
1110 scantable += run;
1111 j = *scantable;
1112 level= (level*qscale*quant_matrix[j])>>4;
1113 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1114 LAST_SKIP_BITS(re, &s->gb, 1);
1115 } else {
1116 /* escape */
1117 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1118 UPDATE_CACHE(re, &s->gb);
1119 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1120 scantable += run;
1121 j = *scantable;
1122 if(level<0){
1123 level= (-level*qscale*quant_matrix[j])>>4;
1124 level= -level;
1125 }else{
1126 level= (level*qscale*quant_matrix[j])>>4;
1127 }
1128 }
1129
1130 block[j] = level;
1131 }
1132 CLOSE_READER(re, &s->gb);
1133 }
1134
1135 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1136 return 0;
1137 }
1138
1139 typedef struct Mpeg1Context {
1140 MpegEncContext mpeg_enc_ctx;
1141 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1142 int repeat_field; /* true if we must repeat the field */
1143 AVPanScan pan_scan; /**< some temporary storage for the panscan */
1144 int slice_count;
1145 int swap_uv;//indicate VCR2
1146 int save_aspect_info;
1147 int save_width, save_height, save_progressive_seq;
1148 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1149 int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1150 } Mpeg1Context;
1151
1152 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1153 {
1154 Mpeg1Context *s = avctx->priv_data;
1155 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1156 int i;
1157
1158 /* we need some permutation to store matrices,
1159 * until MPV_common_init() sets the real permutation. */
1160 for(i=0;i<64;i++)
1161 s2->dsp.idct_permutation[i]=i;
1162
1163 MPV_decode_defaults(s2);
1164
1165 s->mpeg_enc_ctx.avctx= avctx;
1166 s->mpeg_enc_ctx.flags= avctx->flags;
1167 s->mpeg_enc_ctx.flags2= avctx->flags2;
1168 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1169 ff_mpeg12_init_vlcs();
1170
1171 s->mpeg_enc_ctx_allocated = 0;
1172 s->mpeg_enc_ctx.picture_number = 0;
1173 s->repeat_field = 0;
1174 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1175 avctx->color_range= AVCOL_RANGE_MPEG;
1176 if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1177 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1178 else
1179 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1180 return 0;
1181 }
1182
1183 static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
1184 {
1185 Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1186 MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1187 int err;
1188
1189 if(avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
1190 return 0;
1191
1192 err = ff_mpeg_update_thread_context(avctx, avctx_from);
1193 if(err) return err;
1194
1195 if(!ctx->mpeg_enc_ctx_allocated)
1196 memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1197
1198 if(!(s->pict_type == FF_B_TYPE || s->low_delay))
1199 s->picture_number++;
1200
1201 return 0;
1202 }
1203
1204 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1205 const uint8_t *new_perm){
1206 uint16_t temp_matrix[64];
1207 int i;
1208
1209 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1210
1211 for(i=0;i<64;i++){
1212 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1213 }
1214 }
1215
1216 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1217 Mpeg1Context *s1 = avctx->priv_data;
1218 MpegEncContext *s = &s1->mpeg_enc_ctx;
1219
1220 if(avctx->xvmc_acceleration)
1221 return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1222 else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1223 if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1224 return PIX_FMT_VDPAU_MPEG1;
1225 else
1226 return PIX_FMT_VDPAU_MPEG2;
1227 }else{
1228 if(s->chroma_format < 2)
1229 return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1230 else if(s->chroma_format == 2)
1231 return PIX_FMT_YUV422P;
1232 else
1233 return PIX_FMT_YUV444P;
1234 }
1235 }
1236
1237 /* Call this function when we know all parameters.
1238 * It may be called in different places for MPEG-1 and MPEG-2. */
1239 static int mpeg_decode_postinit(AVCodecContext *avctx){
1240 Mpeg1Context *s1 = avctx->priv_data;
1241 MpegEncContext *s = &s1->mpeg_enc_ctx;
1242 uint8_t old_permutation[64];
1243
1244 if (
1245 (s1->mpeg_enc_ctx_allocated == 0)||
1246 avctx->coded_width != s->width ||
1247 avctx->coded_height != s->height||
1248 s1->save_width != s->width ||
1249 s1->save_height != s->height ||
1250 s1->save_aspect_info != s->aspect_ratio_info||
1251 s1->save_progressive_seq != s->progressive_sequence ||
1252 0)
1253 {
1254
1255 if (s1->mpeg_enc_ctx_allocated) {
1256 ParseContext pc= s->parse_context;
1257 s->parse_context.buffer=0;
1258 MPV_common_end(s);
1259 s->parse_context= pc;
1260 }
1261
1262 if( (s->width == 0 )||(s->height == 0))
1263 return -2;
1264
1265 avcodec_set_dimensions(avctx, s->width, s->height);
1266 avctx->bit_rate = s->bit_rate;
1267 s1->save_aspect_info = s->aspect_ratio_info;
1268 s1->save_width = s->width;
1269 s1->save_height = s->height;
1270 s1->save_progressive_seq = s->progressive_sequence;
1271
1272 /* low_delay may be forced, in this case we will have B-frames
1273 * that behave like P-frames. */
1274 avctx->has_b_frames = !(s->low_delay);
1275
1276 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1277 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1278 //MPEG-1 fps
1279 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1280 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1281 //MPEG-1 aspect
1282 avctx->sample_aspect_ratio= av_d2q(
1283 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1284 avctx->ticks_per_frame=1;
1285 }else{//MPEG-2
1286 //MPEG-2 fps
1287 av_reduce(
1288 &s->avctx->time_base.den,
1289 &s->avctx->time_base.num,
1290 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1291 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1292 1<<30);
1293 avctx->ticks_per_frame=2;
1294 //MPEG-2 aspect
1295 if(s->aspect_ratio_info > 1){
1296 AVRational dar =
1297 av_mul_q(
1298 av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1299 (AVRational){s1->pan_scan.width, s1->pan_scan.height}),
1300 (AVRational){s->width, s->height});
1301
1302 // we ignore the spec here and guess a bit as reality does not match the spec, see for example
1303 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1304 // issue1613, 621, 562
1305 if((s1->pan_scan.width == 0 ) || (s1->pan_scan.height == 0) ||
1306 (av_cmp_q(dar,(AVRational){4,3}) && av_cmp_q(dar,(AVRational){16,9}))) {
1307 s->avctx->sample_aspect_ratio=
1308 av_div_q(
1309 ff_mpeg2_aspect[s->aspect_ratio_info],
1310 (AVRational){s->width, s->height}
1311 );
1312 }else{
1313 s->avctx->sample_aspect_ratio=
1314 av_div_q(
1315 ff_mpeg2_aspect[s->aspect_ratio_info],
1316 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1317 );
1318 //issue1613 4/3 16/9 -> 16/9
1319 //res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1320 //widescreen-issue562.mpg 4/3 16/9 -> 16/9
1321 // s->avctx->sample_aspect_ratio= av_mul_q(s->avctx->sample_aspect_ratio, (AVRational){s->width, s->height});
1322 //av_log(NULL, AV_LOG_ERROR, "A %d/%d\n",ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
1323 //av_log(NULL, AV_LOG_ERROR, "B %d/%d\n",s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den);
1324 }
1325 }else{
1326 s->avctx->sample_aspect_ratio=
1327 ff_mpeg2_aspect[s->aspect_ratio_info];
1328 }
1329 }//MPEG-2
1330
1331 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1332 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1333 //until then pix_fmt may be changed right after codec init
1334 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1335 avctx->hwaccel ||
1336 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1337 if( avctx->idct_algo == FF_IDCT_AUTO )
1338 avctx->idct_algo = FF_IDCT_SIMPLE;
1339
1340 /* Quantization matrices may need reordering
1341 * if DCT permutation is changed. */
1342 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1343
1344 if (MPV_common_init(s) < 0)
1345 return -2;
1346
1347 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1348 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1349 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1350 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1351
1352 s1->mpeg_enc_ctx_allocated = 1;
1353 }
1354 return 0;
1355 }
1356
1357 static int mpeg1_decode_picture(AVCodecContext *avctx,
1358 const uint8_t *buf, int buf_size)
1359 {
1360 Mpeg1Context *s1 = avctx->priv_data;
1361 MpegEncContext *s = &s1->mpeg_enc_ctx;
1362 int ref, f_code, vbv_delay;
1363
1364 init_get_bits(&s->gb, buf, buf_size*8);
1365
1366 ref = get_bits(&s->gb, 10); /* temporal ref */
1367 s->pict_type = get_bits(&s->gb, 3);
1368 if(s->pict_type == 0 || s->pict_type > 3)
1369 return -1;
1370
1371 vbv_delay= get_bits(&s->gb, 16);
1372 if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1373 s->full_pel[0] = get_bits1(&s->gb);
1374 f_code = get_bits(&s->gb, 3);
1375 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1376 return -1;
1377 s->mpeg_f_code[0][0] = f_code;
1378 s->mpeg_f_code[0][1] = f_code;
1379 }
1380 if (s->pict_type == AV_PICTURE_TYPE_B) {
1381 s->full_pel[1] = get_bits1(&s->gb);
1382 f_code = get_bits(&s->gb, 3);
1383 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1384 return -1;
1385 s->mpeg_f_code[1][0] = f_code;
1386 s->mpeg_f_code[1][1] = f_code;
1387 }
1388 s->current_picture.f.pict_type = s->pict_type;
1389 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1390
1391 if(avctx->debug & FF_DEBUG_PICT_INFO)
1392 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1393
1394 s->y_dc_scale = 8;
1395 s->c_dc_scale = 8;
1396 return 0;
1397 }
1398
1399 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1400 {
1401 MpegEncContext *s= &s1->mpeg_enc_ctx;
1402 int horiz_size_ext, vert_size_ext;
1403 int bit_rate_ext;
1404
1405 skip_bits(&s->gb, 1); /* profile and level esc*/
1406 s->avctx->profile= get_bits(&s->gb, 3);
1407 s->avctx->level= get_bits(&s->gb, 4);
1408 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1409 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1410 horiz_size_ext = get_bits(&s->gb, 2);
1411 vert_size_ext = get_bits(&s->gb, 2);
1412 s->width |= (horiz_size_ext << 12);
1413 s->height |= (vert_size_ext << 12);
1414 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1415 s->bit_rate += (bit_rate_ext << 18) * 400;
1416 skip_bits1(&s->gb); /* marker */
1417 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1418
1419 s->low_delay = get_bits1(&s->gb);
1420 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1421
1422 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1423 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1424
1425 av_dlog(s->avctx, "sequence extension\n");
1426 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1427 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1428
1429 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1430 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1431 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1432
1433 }
1434
1435 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1436 {
1437 MpegEncContext *s= &s1->mpeg_enc_ctx;
1438 int color_description, w, h;
1439
1440 skip_bits(&s->gb, 3); /* video format */
1441 color_description= get_bits1(&s->gb);
1442 if(color_description){
1443 s->avctx->color_primaries= get_bits(&s->gb, 8);
1444 s->avctx->color_trc = get_bits(&s->gb, 8);
1445 s->avctx->colorspace = get_bits(&s->gb, 8);
1446 }
1447 w= get_bits(&s->gb, 14);
1448 skip_bits(&s->gb, 1); //marker
1449 h= get_bits(&s->gb, 14);
1450 // remaining 3 bits are zero padding
1451
1452 s1->pan_scan.width= 16*w;
1453 s1->pan_scan.height=16*h;
1454
1455 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1456 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1457 }
1458
1459 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1460 {
1461 MpegEncContext *s= &s1->mpeg_enc_ctx;
1462 int i,nofco;
1463
1464 nofco = 1;
1465 if(s->progressive_sequence){
1466 if(s->repeat_first_field){
1467 nofco++;
1468 if(s->top_field_first)
1469 nofco++;
1470 }
1471 }else{
1472 if(s->picture_structure == PICT_FRAME){
1473 nofco++;
1474 if(s->repeat_first_field)
1475 nofco++;
1476 }
1477 }
1478 for(i=0; i<nofco; i++){
1479 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1480 skip_bits(&s->gb, 1); //marker
1481 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1482 skip_bits(&s->gb, 1); //marker
1483 }
1484
1485 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1486 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1487 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1488 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1489 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1490 );
1491 }
1492
1493 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1494 int i;
1495
1496 for(i=0; i<64; i++) {
1497 int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1498 int v = get_bits(&s->gb, 8);
1499 if(v==0){
1500 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1501 return -1;
1502 }
1503 if(intra && i==0 && v!=8){
1504 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1505 v= 8; // needed by pink.mpg / issue1046
1506 }
1507 matrix0[j] = v;
1508 if(matrix1)
1509 matrix1[j] = v;
1510 }
1511 return 0;
1512 }
1513
1514 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1515 {
1516 av_dlog(s->avctx, "matrix extension\n");
1517
1518 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1519 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1520 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1521 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1522 }
1523
1524 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1525 {
1526 MpegEncContext *s= &s1->mpeg_enc_ctx;
1527
1528 s->full_pel[0] = s->full_pel[1] = 0;
1529 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1530 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1531 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1532 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1533 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1534 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1535 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1536 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1537 s->pict_type= AV_PICTURE_TYPE_I;
1538 else
1539 s->pict_type= AV_PICTURE_TYPE_P;
1540 }else
1541 s->pict_type= AV_PICTURE_TYPE_B;
1542 s->current_picture.f.pict_type = s->pict_type;
1543 s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1544 }
1545 s->intra_dc_precision = get_bits(&s->gb, 2);
1546 s->picture_structure = get_bits(&s->gb, 2);
1547 s->top_field_first = get_bits1(&s->gb);
1548 s->frame_pred_frame_dct = get_bits1(&s->gb);
1549 s->concealment_motion_vectors = get_bits1(&s->gb);
1550 s->q_scale_type = get_bits1(&s->gb);
1551 s->intra_vlc_format = get_bits1(&s->gb);
1552 s->alternate_scan = get_bits1(&s->gb);
1553 s->repeat_first_field = get_bits1(&s->gb);
1554 s->chroma_420_type = get_bits1(&s->gb);
1555 s->progressive_frame = get_bits1(&s->gb);
1556
1557 if(s->progressive_sequence && !s->progressive_frame){
1558 s->progressive_frame= 1;
1559 av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1560 }
1561
1562 if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1563 av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1564 s->picture_structure= PICT_FRAME;
1565 }
1566
1567 if(s->progressive_sequence && !s->frame_pred_frame_dct){
1568 av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1569 s->frame_pred_frame_dct= 1;
1570 }
1571
1572 if(s->picture_structure == PICT_FRAME){
1573 s->first_field=0;
1574 s->v_edge_pos= 16*s->mb_height;
1575 }else{
1576 s->first_field ^= 1;
1577 s->v_edge_pos= 8*s->mb_height;
1578 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1579 }
1580
1581 if(s->alternate_scan){
1582 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1583 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1584 }else{
1585 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1586 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1587 }
1588
1589 /* composite display not parsed */
1590 av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1591 av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1592 av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1593 av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1594 av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1595 av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1596 av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1597 av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1598 av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1599 }
1600
1601 static void exchange_uv(MpegEncContext *s){
1602 DCTELEM (*tmp)[64];
1603
1604 tmp = s->pblocks[4];
1605 s->pblocks[4] = s->pblocks[5];
1606 s->pblocks[5] = tmp;
1607 }
1608
1609 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1610 AVCodecContext *avctx= s->avctx;
1611 Mpeg1Context *s1 = (Mpeg1Context*)s;
1612
1613 /* start frame decoding */
1614 if(s->first_field || s->picture_structure==PICT_FRAME){
1615 if(MPV_frame_start(s, avctx) < 0)
1616 return -1;
1617
1618 ff_er_frame_start(s);
1619
1620 /* first check if we must repeat the frame */
1621 s->current_picture_ptr->f.repeat_pict = 0;
1622 if (s->repeat_first_field) {
1623 if (s->progressive_sequence) {
1624 if (s->top_field_first)
1625 s->current_picture_ptr->f.repeat_pict = 4;
1626 else
1627 s->current_picture_ptr->f.repeat_pict = 2;
1628 } else if (s->progressive_frame) {
1629 s->current_picture_ptr->f.repeat_pict = 1;
1630 }
1631 }
1632
1633 *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1634
1635 if (HAVE_PTHREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1636 ff_thread_finish_setup(avctx);
1637 }else{ //second field
1638 int i;
1639
1640 if(!s->current_picture_ptr){
1641 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1642 return -1;
1643 }
1644
1645 for(i=0; i<4; i++){
1646 s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
1647 if(s->picture_structure == PICT_BOTTOM_FIELD){
1648 s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1649 }
1650 }
1651 }
1652
1653 if (avctx->hwaccel) {
1654 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1655 return -1;
1656 }
1657
1658 // MPV_frame_start will call this function too,
1659 // but we need to call it on every field
1660 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1661 if(ff_xvmc_field_start(s,avctx) < 0)
1662 return -1;
1663
1664 return 0;
1665 }
1666
1667 #define DECODE_SLICE_ERROR -1
1668 #define DECODE_SLICE_OK 0
1669
1670 /**
1671 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1672 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1673 * DECODE_SLICE_OK if this slice is ok<br>
1674 */
1675 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1676 const uint8_t **buf, int buf_size)
1677 {
1678 MpegEncContext *s = &s1->mpeg_enc_ctx;
1679 AVCodecContext *avctx= s->avctx;
1680 const int field_pic= s->picture_structure != PICT_FRAME;
1681 const int lowres= s->avctx->lowres;
1682
1683 s->resync_mb_x=
1684 s->resync_mb_y= -1;
1685
1686 assert(mb_y < s->mb_height);
1687
1688 init_get_bits(&s->gb, *buf, buf_size*8);
1689
1690 ff_mpeg1_clean_buffers(s);
1691 s->interlaced_dct = 0;
1692
1693 s->qscale = get_qscale(s);
1694
1695 if(s->qscale == 0){
1696 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1697 return -1;
1698 }
1699
1700 /* extra slice info */
1701 while (get_bits1(&s->gb) != 0) {
1702 skip_bits(&s->gb, 8);
1703 }
1704
1705 s->mb_x=0;
1706
1707 if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1708 skip_bits1(&s->gb);
1709 }else{
1710 for(;;) {
1711 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1712 if (code < 0){
1713 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1714 return -1;
1715 }
1716 if (code >= 33) {
1717 if (code == 33) {
1718 s->mb_x += 33;
1719 }
1720 /* otherwise, stuffing, nothing to do */
1721 } else {
1722 s->mb_x += code;
1723 break;
1724 }
1725 }
1726 }
1727
1728 if(s->mb_x >= (unsigned)s->mb_width){
1729 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1730 return -1;
1731 }
1732
1733 if (avctx->hwaccel) {
1734 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1735 int start_code = -1;
1736 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1737 if (buf_end < *buf + buf_size)
1738 buf_end -= 4;
1739 s->mb_y = mb_y;
1740 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1741 return DECODE_SLICE_ERROR;
1742 *buf = buf_end;
1743 return DECODE_SLICE_OK;
1744 }
1745
1746 s->resync_mb_x= s->mb_x;
1747 s->resync_mb_y= s->mb_y= mb_y;
1748 s->mb_skip_run= 0;
1749 ff_init_block_index(s);
1750
1751 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1752 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1753 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",
1754 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],
1755 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")),
1756 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1757 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1758 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1759 }
1760 }
1761
1762 for(;;) {
1763 //If 1, we memcpy blocks in xvmcvideo.
1764 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1765 ff_xvmc_init_block(s);//set s->block
1766
1767 if(mpeg_decode_mb(s, s->block) < 0)
1768 return -1;
1769
1770 if (s->current_picture.f.motion_val[0] && !s->encoding) { //note motion_val is normally NULL unless we want to extract the MVs
1771 const int wrap = s->b8_stride;
1772 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1773 int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1774 int motion_x, motion_y, dir, i;
1775
1776 for(i=0; i<2; i++){
1777 for(dir=0; dir<2; dir++){
1778 if (s->mb_intra || (dir==1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1779 motion_x = motion_y = 0;
1780 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1781 motion_x = s->mv[dir][0][0];
1782 motion_y = s->mv[dir][0][1];
1783 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1784 motion_x = s->mv[dir][i][0];
1785 motion_y = s->mv[dir][i][1];
1786 }
1787
1788 s->current_picture.f.motion_val[dir][xy ][0] = motion_x;
1789 s->current_picture.f.motion_val[dir][xy ][1] = motion_y;
1790 s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
1791 s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
1792 s->current_picture.f.ref_index [dir][b8_xy ] =
1793 s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1794 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1795 }
1796 xy += wrap;
1797 b8_xy +=2;
1798 }
1799 }
1800
1801 s->dest[0] += 16 >> lowres;
1802 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1803 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1804
1805 MPV_decode_mb(s, s->block);
1806
1807 if (++s->mb_x >= s->mb_width) {
1808 const int mb_size= 16>>s->avctx->lowres;
1809
1810 ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1811 MPV_report_decode_progress(s);
1812
1813 s->mb_x = 0;
1814 s->mb_y += 1<<field_pic;
1815
1816 if(s->mb_y >= s->mb_height){
1817 int left= get_bits_left(&s->gb);
1818 int is_d10= s->chroma_format==2 && s->pict_type==AV_PICTURE_TYPE_I && avctx->profile==0 && avctx->level==5
1819 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1820 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1821
1822 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1823 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1824 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1825 return -1;
1826 }else
1827 goto eos;
1828 }
1829
1830 ff_init_block_index(s);
1831 }
1832
1833 /* skip mb handling */
1834 if (s->mb_skip_run == -1) {
1835 /* read increment again */
1836 s->mb_skip_run = 0;
1837 for(;;) {
1838 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1839 if (code < 0){
1840 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1841 return -1;
1842 }
1843 if (code >= 33) {
1844 if (code == 33) {
1845 s->mb_skip_run += 33;
1846 }else if(code == 35){
1847 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1848 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1849 return -1;
1850 }
1851 goto eos; /* end of slice */
1852 }
1853 /* otherwise, stuffing, nothing to do */
1854 } else {
1855 s->mb_skip_run += code;
1856 break;
1857 }
1858 }
1859 if(s->mb_skip_run){
1860 int i;
1861 if(s->pict_type == AV_PICTURE_TYPE_I){
1862 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1863 return -1;
1864 }
1865
1866 /* skip mb */
1867 s->mb_intra = 0;
1868 for(i=0;i<12;i++)
1869 s->block_last_index[i] = -1;
1870 if(s->picture_structure == PICT_FRAME)
1871 s->mv_type = MV_TYPE_16X16;
1872 else
1873 s->mv_type = MV_TYPE_FIELD;
1874 if (s->pict_type == AV_PICTURE_TYPE_P) {
1875 /* if P type, zero motion vector is implied */
1876 s->mv_dir = MV_DIR_FORWARD;
1877 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1878 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1879 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1880 s->field_select[0][0]= (s->picture_structure - 1) & 1;
1881 } else {
1882 /* if B type, reuse previous vectors and directions */
1883 s->mv[0][0][0] = s->last_mv[0][0][0];
1884 s->mv[0][0][1] = s->last_mv[0][0][1];
1885 s->mv[1][0][0] = s->last_mv[1][0][0];
1886 s->mv[1][0][1] = s->last_mv[1][0][1];
1887 }
1888 }
1889 }
1890 }
1891 eos: // end of slice
1892 *buf += (get_bits_count(&s->gb)-1)/8;
1893 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1894 return 0;
1895 }
1896
1897 static int slice_decode_thread(AVCodecContext *c, void *arg){
1898 MpegEncContext *s= *(void**)arg;
1899 const uint8_t *buf= s->gb.buffer;
1900 int mb_y= s->start_mb_y;
1901 const int field_pic= s->picture_structure != PICT_FRAME;
1902
1903 s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1904
1905 for(;;){
1906 uint32_t start_code;
1907 int ret;
1908
1909 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1910 emms_c();
1911 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1912 //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);
1913 if(ret < 0){
1914 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1915 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);
1916 }else{
1917 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);
1918 }
1919
1920 if(s->mb_y == s->end_mb_y)
1921 return 0;
1922
1923 start_code= -1;
1924 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1925 mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
1926 if (s->picture_structure == PICT_BOTTOM_FIELD)
1927 mb_y++;
1928 if(mb_y < 0 || mb_y >= s->end_mb_y)
1929 return -1;
1930 }
1931 }
1932
1933 /**
1934 * Handle slice ends.
1935 * @return 1 if it seems to be the last slice
1936 */
1937 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1938 {
1939 Mpeg1Context *s1 = avctx->priv_data;
1940 MpegEncContext *s = &s1->mpeg_enc_ctx;
1941
1942 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1943 return 0;
1944
1945 if (s->avctx->hwaccel) {
1946 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1947 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1948 }
1949
1950 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1951 ff_xvmc_field_end(s);
1952
1953 /* end of slice reached */
1954 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1955 /* end of image */
1956
1957 s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
1958
1959 ff_er_frame_end(s);
1960
1961 MPV_frame_end(s);
1962
1963 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1964 *pict= *(AVFrame*)s->current_picture_ptr;
1965 ff_print_debug_info(s, pict);
1966 } else {
1967 if (avctx->active_thread_type & FF_THREAD_FRAME)
1968 s->picture_number++;
1969 /* latency of 1 frame for I- and P-frames */
1970 /* XXX: use another variable than picture_number */
1971 if (s->last_picture_ptr != NULL) {
1972 *pict= *(AVFrame*)s->last_picture_ptr;
1973 ff_print_debug_info(s, pict);
1974 }
1975 }
1976
1977 return 1;
1978 } else {
1979 return 0;
1980 }
1981 }
1982
1983 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1984 const uint8_t *buf, int buf_size)
1985 {
1986 Mpeg1Context *s1 = avctx->priv_data;
1987 MpegEncContext *s = &s1->mpeg_enc_ctx;
1988 int width,height;
1989 int i, v, j;
1990
1991 init_get_bits(&s->gb, buf, buf_size*8);
1992
1993 width = get_bits(&s->gb, 12);
1994 height = get_bits(&s->gb, 12);
1995 if (width <= 0 || height <= 0)
1996 return -1;
1997 s->aspect_ratio_info= get_bits(&s->gb, 4);
1998 if (s->aspect_ratio_info == 0) {
1999 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2000 if (avctx->error_recognition >= FF_ER_COMPLIANT)
2001 return -1;
2002 }
2003 s->frame_rate_index = get_bits(&s->gb, 4);
2004 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2005 return -1;
2006 s->bit_rate = get_bits(&s->gb, 18) * 400;
2007 if (get_bits1(&s->gb) == 0) /* marker */
2008 return -1;
2009 s->width = width;
2010 s->height = height;
2011
2012 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2013 skip_bits(&s->gb, 1);
2014
2015 /* get matrix */
2016 if (get_bits1(&s->gb)) {
2017 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2018 } else {
2019 for(i=0;i<64;i++) {
2020 j = s->dsp.idct_permutation[i];
2021 v = ff_mpeg1_default_intra_matrix[i];
2022 s->intra_matrix[j] = v;
2023 s->chroma_intra_matrix[j] = v;
2024 }
2025 }
2026 if (get_bits1(&s->gb)) {
2027 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2028 } else {
2029 for(i=0;i<64;i++) {
2030 int j= s->dsp.idct_permutation[i];
2031 v = ff_mpeg1_default_non_intra_matrix[i];
2032 s->inter_matrix[j] = v;
2033 s->chroma_inter_matrix[j] = v;
2034 }
2035 }
2036
2037 if(show_bits(&s->gb, 23) != 0){
2038 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2039 return -1;
2040 }
2041
2042 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2043 s->progressive_sequence = 1;
2044 s->progressive_frame = 1;
2045 s->picture_structure = PICT_FRAME;
2046 s->frame_pred_frame_dct = 1;
2047 s->chroma_format = 1;
2048 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2049 avctx->sub_id = 1; /* indicates MPEG-1 */
2050 s->out_format = FMT_MPEG1;
2051 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2052 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2053
2054 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2055 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2056 s->avctx->rc_buffer_size, s->bit_rate);
2057
2058 return 0;
2059 }
2060
2061 static int vcr2_init_sequence(AVCodecContext *avctx)
2062 {
2063 Mpeg1Context *s1 = avctx->priv_data;
2064 MpegEncContext *s = &s1->mpeg_enc_ctx;
2065 int i, v;
2066
2067 /* start new MPEG-1 context decoding */
2068 s->out_format = FMT_MPEG1;
2069 if (s1->mpeg_enc_ctx_allocated) {
2070 MPV_common_end(s);
2071 }
2072 s->width = avctx->coded_width;
2073 s->height = avctx->coded_height;
2074 avctx->has_b_frames= 0; //true?
2075 s->low_delay= 1;
2076
2077 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2078 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2079
2080 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2081 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2082 if( avctx->idct_algo == FF_IDCT_AUTO )
2083 avctx->idct_algo = FF_IDCT_SIMPLE;
2084
2085 if (MPV_common_init(s) < 0)
2086 return -1;
2087 exchange_uv(s);//common init reset pblocks, so we swap them here
2088 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2089 s1->mpeg_enc_ctx_allocated = 1;
2090
2091 for(i=0;i<64;i++) {
2092 int j= s->dsp.idct_permutation[i];
2093 v = ff_mpeg1_default_intra_matrix[i];
2094 s->intra_matrix[j] = v;
2095 s->chroma_intra_matrix[j] = v;
2096
2097 v = ff_mpeg1_default_non_intra_matrix[i];
2098 s->inter_matrix[j] = v;
2099 s->chroma_inter_matrix[j] = v;
2100 }
2101
2102 s->progressive_sequence = 1;
2103 s->progressive_frame = 1;
2104 s->picture_structure = PICT_FRAME;
2105 s->frame_pred_frame_dct = 1;
2106 s->chroma_format = 1;
2107 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2108 avctx->sub_id = 2; /* indicates MPEG-2 */
2109 s1->save_width = s->width;
2110 s1->save_height = s->height;
2111 s1->save_progressive_seq = s->progressive_sequence;
2112 return 0;
2113 }
2114
2115
2116 static void mpeg_decode_user_data(AVCodecContext *avctx,
2117 const uint8_t *p, int buf_size)
2118 {
2119 const uint8_t *buf_end = p+buf_size;
2120
2121 /* we parse the DTG active format information */
2122 if (buf_end - p >= 5 &&
2123 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2124 int flags = p[4];
2125 p += 5;
2126 if (flags & 0x80) {
2127 /* skip event id */
2128 p += 2;
2129 }
2130 if (flags & 0x40) {
2131 if (buf_end - p < 1)
2132 return;
2133 avctx->dtg_active_format = p[0] & 0x0f;
2134 }
2135 }
2136 }
2137
2138 static void mpeg_decode_gop(AVCodecContext *avctx,
2139 const uint8_t *buf, int buf_size){
2140 Mpeg1Context *s1 = avctx->priv_data;
2141 MpegEncContext *s = &s1->mpeg_enc_ctx;
2142
2143 int time_code_hours, time_code_minutes;
2144 int time_code_seconds, time_code_pictures;
2145 int broken_link;
2146
2147 init_get_bits(&s->gb, buf, buf_size*8);
2148
2149 skip_bits1(&s->gb); /* drop_frame_flag */
2150
2151 time_code_hours=get_bits(&s->gb,5);
2152 time_code_minutes = get_bits(&s->gb,6);
2153 skip_bits1(&s->gb);//marker bit
2154 time_code_seconds = get_bits(&s->gb,6);
2155 time_code_pictures = get_bits(&s->gb,6);
2156
2157 s->closed_gop = get_bits1(&s->gb);
2158 /*broken_link indicate that after editing the
2159 reference frames of the first B-Frames after GOP I-Frame
2160 are missing (open gop)*/
2161 broken_link = get_bits1(&s->gb);
2162
2163 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2164 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2165 time_code_hours, time_code_minutes, time_code_seconds,
2166 time_code_pictures, s->closed_gop, broken_link);
2167 }
2168 /**
2169 * Find the end of the current frame in the bitstream.
2170 * @return the position of the first byte of the next frame, or -1
2171 */
2172 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2173 {
2174 int i;
2175 uint32_t state= pc->state;
2176
2177 /* EOF considered as end of frame */
2178 if (buf_size == 0)
2179 return 0;
2180
2181 /*
2182 0 frame start -> 1/4
2183 1 first_SEQEXT -> 0/2
2184 2 first field start -> 3/0
2185 3 second_SEQEXT -> 2/0
2186 4 searching end
2187 */
2188
2189 for(i=0; i<buf_size; i++){
2190 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2191 if(pc->frame_start_found&1){
2192 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2193 pc->frame_start_found--;
2194 else if(state == EXT_START_CODE+2){
2195 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2196 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2197 }
2198 state++;
2199 }else{
2200 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2201 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2202 i++;
2203 pc->frame_start_found=4;
2204 }
2205 if(state == SEQ_END_CODE){
2206 pc->state=-1;
2207 return i+1;
2208 }
2209 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2210 pc->frame_start_found= 0;
2211 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2212 pc->frame_start_found++;
2213 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2214 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2215 pc->frame_start_found=0;
2216 pc->state=-1;
2217 return i-3;
2218 }
2219 }
2220 if(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
2221 ff_fetch_timestamp(s, i-3, 1);
2222 }
2223 }
2224 }
2225 pc->state= state;
2226 return END_NOT_FOUND;
2227 }
2228
2229 static int decode_chunks(AVCodecContext *avctx,
2230 AVFrame *picture, int *data_size,
2231 const uint8_t *buf, int buf_size);
2232
2233 /* handle buffering and image synchronisation */
2234 static int mpeg_decode_frame(AVCodecContext *avctx,
2235 void *data, int *data_size,
2236 AVPacket *avpkt)
2237 {
2238 const uint8_t *buf = avpkt->data;
2239 int buf_size = avpkt->size;
2240 Mpeg1Context *s = avctx->priv_data;
2241 AVFrame *picture = data;
2242 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2243 av_dlog(avctx, "fill_buffer\n");
2244
2245 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2246 /* special case for last picture */
2247 if (s2->low_delay==0 && s2->next_picture_ptr) {
2248 *picture= *(AVFrame*)s2->next_picture_ptr;
2249 s2->next_picture_ptr= NULL;
2250
2251 *data_size = sizeof(AVFrame);
2252 }
2253 return buf_size;
2254 }
2255
2256 if(s2->flags&CODEC_FLAG_TRUNCATED){
2257 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2258
2259 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2260 return buf_size;
2261 }
2262
2263 #if 0
2264 if (s->repeat_field % 2 == 1) {
2265 s->repeat_field++;
2266 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2267 // s2->picture_number, s->repeat_field);
2268 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2269 *data_size = sizeof(AVPicture);
2270 goto the_end;
2271 }
2272 }
2273 #endif
2274
2275 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2276 vcr2_init_sequence(avctx);
2277
2278 s->slice_count= 0;
2279
2280 if(avctx->extradata && !avctx->frame_number)
2281 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2282
2283 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2284 }
2285
2286 static int decode_chunks(AVCodecContext *avctx,
2287 AVFrame *picture, int *data_size,
2288 const uint8_t *buf, int buf_size)
2289 {
2290 Mpeg1Context *s = avctx->priv_data;
2291 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2292 const uint8_t *buf_ptr = buf;
2293 const uint8_t *buf_end = buf + buf_size;
2294 int ret, input_size;
2295 int last_code= 0;
2296
2297 for(;;) {
2298 /* find next start code */
2299 uint32_t start_code = -1;
2300 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2301 if (start_code > 0x1ff){
2302 if(s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT){
2303 if(HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)){
2304 int i;
2305
2306 avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void*));
2307 for(i=0; i<s->slice_count; i++)
2308 s2->error_count += s2->thread_context[i]->error_count;
2309 }
2310
2311 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2312 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2313
2314 if (slice_end(avctx, picture)) {
2315 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2316 *data_size = sizeof(AVPicture);
2317 }
2318 }
2319 s2->pict_type= 0;
2320 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2321 }
2322
2323 input_size = buf_end - buf_ptr;
2324
2325 if(avctx->debug & FF_DEBUG_STARTCODE){
2326 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2327 }
2328
2329 /* prepare data for next start code */
2330 switch(start_code) {
2331 case SEQ_START_CODE:
2332 if(last_code == 0){
2333 mpeg1_decode_sequence(avctx, buf_ptr,
2334 input_size);
2335 s->sync=1;
2336 }else{
2337 av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2338 }
2339 break;
2340
2341 case PICTURE_START_CODE:
2342 if (HAVE_THREADS && (avctx->active_thread_type&FF_THREAD_SLICE) && s->slice_count) {
2343 int i;
2344
2345 avctx->execute(avctx, slice_decode_thread,
2346 s2->thread_context, NULL,
2347 s->slice_count, sizeof(void*));
2348 for (i = 0; i < s->slice_count; i++)
2349 s2->error_count += s2->thread_context[i]->error_count;
2350 s->slice_count = 0;
2351 }
2352 if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
2353 if(mpeg_decode_postinit(avctx) < 0){
2354 av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
2355 return -1;
2356 }
2357
2358 /* we have a complete image: we try to decompress it */
2359 if(mpeg1_decode_picture(avctx,
2360 buf_ptr, input_size) < 0)
2361 s2->pict_type=0;
2362 s2->first_slice = 1;
2363 last_code= PICTURE_START_CODE;
2364 }else{
2365 av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
2366 }
2367 break;
2368 case EXT_START_CODE:
2369 init_get_bits(&s2->gb, buf_ptr, input_size*8);
2370
2371 switch(get_bits(&s2->gb, 4)) {
2372 case 0x1:
2373 if(last_code == 0){
2374 mpeg_decode_sequence_extension(s);
2375 }else{
2376 av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
2377 }
2378 break;
2379 case 0x2:
2380 mpeg_decode_sequence_display_extension(s);
2381 break;
2382 case 0x3:
2383 mpeg_decode_quant_matrix_extension(s2);
2384 break;
2385 case 0x7:
2386 mpeg_decode_picture_display_extension(s);
2387 break;
2388 case 0x8:
2389 if(last_code == PICTURE_START_CODE){
2390 mpeg_decode_picture_coding_extension(s);
2391 }else{
2392 av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
2393 }
2394 break;
2395 }
2396 break;
2397 case USER_START_CODE:
2398 mpeg_decode_user_data(avctx,
2399 buf_ptr, input_size);
2400 break;
2401 case GOP_START_CODE:
2402 if(last_code == 0){
2403 s2->first_field=0;
2404 mpeg_decode_gop(avctx,
2405 buf_ptr, input_size);
2406 s->sync=1;
2407 }else{
2408 av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
2409 }
2410 break;
2411 default:
2412 if (start_code >= SLICE_MIN_START_CODE &&
2413 start_code <= SLICE_MAX_START_CODE && last_code!=0) {
2414 const int field_pic= s2->picture_structure != PICT_FRAME;
2415 int mb_y= (start_code - SLICE_MIN_START_CODE) << field_pic;
2416 last_code= SLICE_MIN_START_CODE;
2417
2418 if(s2->picture_structure == PICT_BOTTOM_FIELD)
2419 mb_y++;
2420
2421 if (mb_y >= s2->mb_height){
2422 av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2423 return -1;
2424 }
2425
2426 if(s2->last_picture_ptr==NULL){
2427 /* Skip B-frames if we do not have reference frames and gop is not closed */
2428 if(s2->pict_type==AV_PICTURE_TYPE_B){
2429 if(!s2->closed_gop)
2430 break;
2431 }
2432 }
2433 if(s2->pict_type==AV_PICTURE_TYPE_I)
2434 s->sync=1;
2435 if(s2->next_picture_ptr==NULL){
2436 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2437 if(s2->pict_type==AV_PICTURE_TYPE_P && !s->sync) break;
2438 }
2439 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==AV_PICTURE_TYPE_B)
2440 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=AV_PICTURE_TYPE_I)
2441 || avctx->skip_frame >= AVDISCARD_ALL)
2442 break;
2443
2444 if (!s->mpeg_enc_ctx_allocated) break;
2445
2446 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2447 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2448 break;
2449 }
2450
2451 if(!s2->pict_type){
2452 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2453 break;
2454 }
2455
2456 if(s2->first_slice){
2457 s2->first_slice=0;
2458 if(mpeg_field_start(s2, buf, buf_size) < 0)
2459 return -1;
2460 }
2461 if(!s2->current_picture_ptr){
2462 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2463 return -1;
2464 }
2465
2466 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2467 s->slice_count++;
2468 break;
2469 }
2470
2471 if(HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)){
2472 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2473 if(threshold <= mb_y){
2474 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2475
2476 thread_context->start_mb_y= mb_y;
2477 thread_context->end_mb_y = s2->mb_height;
2478 if(s->slice_count){
2479 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2480 ff_update_duplicate_context(thread_context, s2);
2481 }
2482 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2483 s->slice_count++;
2484 }
2485 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2486 }else{
2487 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2488 emms_c();
2489
2490 if(ret < 0){
2491 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2492 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);
2493 }else{
2494 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);
2495 }
2496 }
2497 }
2498 break;
2499 }
2500 }
2501 }
2502
2503 static void flush(AVCodecContext *avctx){
2504 Mpeg1Context *s = avctx->priv_data;
2505
2506 s->sync=0;
2507
2508 ff_mpeg_flush(avctx);
2509 }
2510
2511 static int mpeg_decode_end(AVCodecContext *avctx)
2512 {
2513 Mpeg1Context *s = avctx->priv_data;
2514
2515 if (s->mpeg_enc_ctx_allocated)
2516 MPV_common_end(&s->mpeg_enc_ctx);
2517 return 0;
2518 }
2519
2520 static const AVProfile mpeg2_video_profiles[] = {
2521 { FF_PROFILE_MPEG2_422, "4:2:2" },
2522 { FF_PROFILE_MPEG2_HIGH, "High" },
2523 { FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
2524 { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
2525 { FF_PROFILE_MPEG2_MAIN, "Main" },
2526 { FF_PROFILE_MPEG2_SIMPLE, "Simple" },
2527 { FF_PROFILE_RESERVED, "Reserved" },
2528 { FF_PROFILE_RESERVED, "Reserved" },
2529 { FF_PROFILE_UNKNOWN },
2530 };
2531
2532
2533 AVCodec ff_mpeg1video_decoder = {
2534 "mpeg1video",
2535 AVMEDIA_TYPE_VIDEO,
2536 CODEC_ID_MPEG1VIDEO,
2537 sizeof(Mpeg1Context),
2538 mpeg_decode_init,
2539 NULL,
2540 mpeg_decode_end,
2541 mpeg_decode_frame,
2542 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2543 .flush= flush,
2544 .max_lowres= 3,
2545 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2546 .update_thread_context= ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
2547 };
2548
2549 AVCodec ff_mpeg2video_decoder = {
2550 "mpeg2video",
2551 AVMEDIA_TYPE_VIDEO,
2552 CODEC_ID_MPEG2VIDEO,
2553 sizeof(Mpeg1Context),
2554 mpeg_decode_init,
2555 NULL,
2556 mpeg_decode_end,
2557 mpeg_decode_frame,
2558 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
2559 .flush= flush,
2560 .max_lowres= 3,
2561 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2562 .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
2563 };
2564
2565 //legacy decoder
2566 AVCodec ff_mpegvideo_decoder = {
2567 "mpegvideo",
2568 AVMEDIA_TYPE_VIDEO,
2569 CODEC_ID_MPEG2VIDEO,
2570 sizeof(Mpeg1Context),
2571 mpeg_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_DELAY | CODEC_CAP_SLICE_THREADS,
2576 .flush= flush,
2577 .max_lowres= 3,
2578 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2579 };
2580
2581 #if CONFIG_MPEG_XVMC_DECODER
2582 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2583 if( avctx->active_thread_type & FF_THREAD_SLICE )
2584 return -1;
2585 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2586 return -1;
2587 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2588 av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2589 }
2590 mpeg_decode_init(avctx);
2591
2592 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2593 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2594
2595 return 0;
2596 }
2597
2598 AVCodec ff_mpeg_xvmc_decoder = {
2599 "mpegvideo_xvmc",
2600 AVMEDIA_TYPE_VIDEO,
2601 CODEC_ID_MPEG2VIDEO_XVMC,
2602 sizeof(Mpeg1Context),
2603 mpeg_mc_decode_init,
2604 NULL,
2605 mpeg_decode_end,
2606 mpeg_decode_frame,
2607 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2608 .flush= flush,
2609 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2610 };
2611
2612 #endif
2613
2614 #if CONFIG_MPEG_VDPAU_DECODER
2615 AVCodec ff_mpeg_vdpau_decoder = {
2616 "mpegvideo_vdpau",
2617 AVMEDIA_TYPE_VIDEO,
2618 CODEC_ID_MPEG2VIDEO,
2619 sizeof(Mpeg1Context),
2620 mpeg_decode_init,
2621 NULL,
2622 mpeg_decode_end,
2623 mpeg_decode_frame,
2624 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2625 .flush= flush,
2626 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2627 };
2628 #endif
2629
2630 #if CONFIG_MPEG1_VDPAU_DECODER
2631 AVCodec ff_mpeg1_vdpau_decoder = {
2632 "mpeg1video_vdpau",
2633 AVMEDIA_TYPE_VIDEO,
2634 CODEC_ID_MPEG1VIDEO,
2635 sizeof(Mpeg1Context),
2636 mpeg_decode_init,
2637 NULL,
2638 mpeg_decode_end,
2639 mpeg_decode_frame,
2640 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2641 .flush= flush,
2642 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2643 };
2644 #endif
2645