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Add channel layout support to the AC-3 encoder.
[FFMpeg-mirror/lagarith.git] / libavcodec / mpeg12.c
blob573ae32ce64d5df76bf98f53f68ec199df219b53
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 libavcodec/mpeg12.c
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_inter(MpegEncContext *s,
52 DCTELEM *block,
53 int n);
54 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
55 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
56 DCTELEM *block,
57 int n);
58 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
59 DCTELEM *block,
60 int n);
61 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
62 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
63 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
64 static void exchange_uv(MpegEncContext *s);
65
66 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
67 PIX_FMT_XVMC_MPEG2_IDCT,
68 PIX_FMT_XVMC_MPEG2_MC,
69 PIX_FMT_NONE};
70
71 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
72
73
74 #define INIT_2D_VLC_RL(rl, static_size)\
75 {\
76 static RL_VLC_ELEM rl_vlc_table[static_size];\
77 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
78 &rl.table_vlc[0][1], 4, 2,\
79 &rl.table_vlc[0][0], 4, 2, static_size);\
80 \
81 rl.rl_vlc[0]= rl_vlc_table;\
82 init_2d_vlc_rl(&rl);\
83 }
84
85 static void init_2d_vlc_rl(RLTable *rl)
86 {
87 int i;
88
89 for(i=0; i<rl->vlc.table_size; i++){
90 int code= rl->vlc.table[i][0];
91 int len = rl->vlc.table[i][1];
92 int level, run;
93
94 if(len==0){ // illegal code
95 run= 65;
96 level= MAX_LEVEL;
97 }else if(len<0){ //more bits needed
98 run= 0;
99 level= code;
100 }else{
101 if(code==rl->n){ //esc
102 run= 65;
103 level= 0;
104 }else if(code==rl->n+1){ //eob
105 run= 0;
106 level= 127;
107 }else{
108 run= rl->table_run [code] + 1;
109 level= rl->table_level[code];
110 }
111 }
112 rl->rl_vlc[0][i].len= len;
113 rl->rl_vlc[0][i].level= level;
114 rl->rl_vlc[0][i].run= run;
115 }
116 }
117
118 void ff_mpeg12_common_init(MpegEncContext *s)
119 {
120
121 s->y_dc_scale_table=
122 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
123
124 }
125
126 void ff_mpeg1_clean_buffers(MpegEncContext *s){
127 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
128 s->last_dc[1] = s->last_dc[0];
129 s->last_dc[2] = s->last_dc[0];
130 memset(s->last_mv, 0, sizeof(s->last_mv));
131 }
132
133
134 /******************************************/
135 /* decoding */
136
137 static VLC mv_vlc;
138 static VLC mbincr_vlc;
139 static VLC mb_ptype_vlc;
140 static VLC mb_btype_vlc;
141 static VLC mb_pat_vlc;
142
143 av_cold void ff_mpeg12_init_vlcs(void)
144 {
145 static int done = 0;
146
147 if (!done) {
148 done = 1;
149
150 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
151 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
152 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
153 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
154 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
155 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
156 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
157 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
158 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
159 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
160 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
161 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
162 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
163 &ff_mpeg12_mbPatTable[0][1], 2, 1,
164 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
165
166 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
167 &table_mb_ptype[0][1], 2, 1,
168 &table_mb_ptype[0][0], 2, 1, 64);
169 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
170 &table_mb_btype[0][1], 2, 1,
171 &table_mb_btype[0][0], 2, 1, 64);
172 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
173 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
174
175 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
176 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
177 }
178 }
179
180 static inline int get_dmv(MpegEncContext *s)
181 {
182 if(get_bits1(&s->gb))
183 return 1 - (get_bits1(&s->gb) << 1);
184 else
185 return 0;
186 }
187
188 static inline int get_qscale(MpegEncContext *s)
189 {
190 int qscale = get_bits(&s->gb, 5);
191 if (s->q_scale_type) {
192 return non_linear_qscale[qscale];
193 } else {
194 return qscale << 1;
195 }
196 }
197
198 /* motion type (for MPEG-2) */
199 #define MT_FIELD 1
200 #define MT_FRAME 2
201 #define MT_16X8 2
202 #define MT_DMV 3
203
204 static int mpeg_decode_mb(MpegEncContext *s,
205 DCTELEM block[12][64])
206 {
207 int i, j, k, cbp, val, mb_type, motion_type;
208 const int mb_block_count = 4 + (1<< s->chroma_format);
209
210 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
211
212 assert(s->mb_skipped==0);
213
214 if (s->mb_skip_run-- != 0) {
215 if (s->pict_type == FF_P_TYPE) {
216 s->mb_skipped = 1;
217 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
218 } else {
219 int mb_type;
220
221 if(s->mb_x)
222 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
223 else
224 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
225 if(IS_INTRA(mb_type))
226 return -1;
227
228 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
229 mb_type | MB_TYPE_SKIP;
230 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
231
232 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
233 s->mb_skipped = 1;
234 }
235
236 return 0;
237 }
238
239 switch(s->pict_type) {
240 default:
241 case FF_I_TYPE:
242 if (get_bits1(&s->gb) == 0) {
243 if (get_bits1(&s->gb) == 0){
244 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
245 return -1;
246 }
247 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
248 } else {
249 mb_type = MB_TYPE_INTRA;
250 }
251 break;
252 case FF_P_TYPE:
253 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
254 if (mb_type < 0){
255 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
256 return -1;
257 }
258 mb_type = ptype2mb_type[ mb_type ];
259 break;
260 case FF_B_TYPE:
261 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
262 if (mb_type < 0){
263 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
264 return -1;
265 }
266 mb_type = btype2mb_type[ mb_type ];
267 break;
268 }
269 dprintf(s->avctx, "mb_type=%x\n", mb_type);
270 // motion_type = 0; /* avoid warning */
271 if (IS_INTRA(mb_type)) {
272 s->dsp.clear_blocks(s->block[0]);
273
274 if(!s->chroma_y_shift){
275 s->dsp.clear_blocks(s->block[6]);
276 }
277
278 /* compute DCT type */
279 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
280 !s->frame_pred_frame_dct) {
281 s->interlaced_dct = get_bits1(&s->gb);
282 }
283
284 if (IS_QUANT(mb_type))
285 s->qscale = get_qscale(s);
286
287 if (s->concealment_motion_vectors) {
288 /* just parse them */
289 if (s->picture_structure != PICT_FRAME)
290 skip_bits1(&s->gb); /* field select */
291
292 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
293 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
294 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
295 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
296
297 skip_bits1(&s->gb); /* marker */
298 }else
299 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
300 s->mb_intra = 1;
301 //if 1, we memcpy blocks in xvmcvideo
302 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
303 ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
304 if(s->swap_uv){
305 exchange_uv(s);
306 }
307 }
308
309 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
310 if(s->flags2 & CODEC_FLAG2_FAST){
311 for(i=0;i<6;i++) {
312 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
313 }
314 }else{
315 for(i=0;i<mb_block_count;i++) {
316 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
317 return -1;
318 }
319 }
320 } else {
321 for(i=0;i<6;i++) {
322 if (ff_mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
323 return -1;
324 }
325 }
326 } else {
327 if (mb_type & MB_TYPE_ZERO_MV){
328 assert(mb_type & MB_TYPE_CBP);
329
330 s->mv_dir = MV_DIR_FORWARD;
331 if(s->picture_structure == PICT_FRAME){
332 if(!s->frame_pred_frame_dct)
333 s->interlaced_dct = get_bits1(&s->gb);
334 s->mv_type = MV_TYPE_16X16;
335 }else{
336 s->mv_type = MV_TYPE_FIELD;
337 mb_type |= MB_TYPE_INTERLACED;
338 s->field_select[0][0]= s->picture_structure - 1;
339 }
340
341 if (IS_QUANT(mb_type))
342 s->qscale = get_qscale(s);
343
344 s->last_mv[0][0][0] = 0;
345 s->last_mv[0][0][1] = 0;
346 s->last_mv[0][1][0] = 0;
347 s->last_mv[0][1][1] = 0;
348 s->mv[0][0][0] = 0;
349 s->mv[0][0][1] = 0;
350 }else{
351 assert(mb_type & MB_TYPE_L0L1);
352 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
353 /* get additional motion vector type */
354 if (s->frame_pred_frame_dct)
355 motion_type = MT_FRAME;
356 else{
357 motion_type = get_bits(&s->gb, 2);
358 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
359 s->interlaced_dct = get_bits1(&s->gb);
360 }
361
362 if (IS_QUANT(mb_type))
363 s->qscale = get_qscale(s);
364
365 /* motion vectors */
366 s->mv_dir= (mb_type>>13)&3;
367 dprintf(s->avctx, "motion_type=%d\n", motion_type);
368 switch(motion_type) {
369 case MT_FRAME: /* or MT_16X8 */
370 if (s->picture_structure == PICT_FRAME) {
371 mb_type |= MB_TYPE_16x16;
372 s->mv_type = MV_TYPE_16X16;
373 for(i=0;i<2;i++) {
374 if (USES_LIST(mb_type, i)) {
375 /* MT_FRAME */
376 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
377 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
378 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
379 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
380 /* full_pel: only for MPEG-1 */
381 if (s->full_pel[i]){
382 s->mv[i][0][0] <<= 1;
383 s->mv[i][0][1] <<= 1;
384 }
385 }
386 }
387 } else {
388 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
389 s->mv_type = MV_TYPE_16X8;
390 for(i=0;i<2;i++) {
391 if (USES_LIST(mb_type, i)) {
392 /* MT_16X8 */
393 for(j=0;j<2;j++) {
394 s->field_select[i][j] = get_bits1(&s->gb);
395 for(k=0;k<2;k++) {
396 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
397 s->last_mv[i][j][k]);
398 s->last_mv[i][j][k] = val;
399 s->mv[i][j][k] = val;
400 }
401 }
402 }
403 }
404 }
405 break;
406 case MT_FIELD:
407 s->mv_type = MV_TYPE_FIELD;
408 if (s->picture_structure == PICT_FRAME) {
409 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
410 for(i=0;i<2;i++) {
411 if (USES_LIST(mb_type, i)) {
412 for(j=0;j<2;j++) {
413 s->field_select[i][j] = get_bits1(&s->gb);
414 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
415 s->last_mv[i][j][0]);
416 s->last_mv[i][j][0] = val;
417 s->mv[i][j][0] = val;
418 dprintf(s->avctx, "fmx=%d\n", val);
419 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
420 s->last_mv[i][j][1] >> 1);
421 s->last_mv[i][j][1] = val << 1;
422 s->mv[i][j][1] = val;
423 dprintf(s->avctx, "fmy=%d\n", val);
424 }
425 }
426 }
427 } else {
428 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
429 for(i=0;i<2;i++) {
430 if (USES_LIST(mb_type, i)) {
431 s->field_select[i][0] = get_bits1(&s->gb);
432 for(k=0;k<2;k++) {
433 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
434 s->last_mv[i][0][k]);
435 s->last_mv[i][0][k] = val;
436 s->last_mv[i][1][k] = val;
437 s->mv[i][0][k] = val;
438 }
439 }
440 }
441 }
442 break;
443 case MT_DMV:
444 s->mv_type = MV_TYPE_DMV;
445 for(i=0;i<2;i++) {
446 if (USES_LIST(mb_type, i)) {
447 int dmx, dmy, mx, my, m;
448 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
449 s->last_mv[i][0][0]);
450 s->last_mv[i][0][0] = mx;
451 s->last_mv[i][1][0] = mx;
452 dmx = get_dmv(s);
453 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
454 s->last_mv[i][0][1] >> 1);
455 dmy = get_dmv(s);
456
457
458 s->last_mv[i][0][1] = my<<1;
459 s->last_mv[i][1][1] = my<<1;
460
461 s->mv[i][0][0] = mx;
462 s->mv[i][0][1] = my;
463 s->mv[i][1][0] = mx;//not used
464 s->mv[i][1][1] = my;//not used
465
466 if (s->picture_structure == PICT_FRAME) {
467 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
468
469 //m = 1 + 2 * s->top_field_first;
470 m = s->top_field_first ? 1 : 3;
471
472 /* top -> top pred */
473 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
474 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
475 m = 4 - m;
476 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
477 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
478 } else {
479 mb_type |= MB_TYPE_16x16;
480
481 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
482 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
483 if(s->picture_structure == PICT_TOP_FIELD)
484 s->mv[i][2][1]--;
485 else
486 s->mv[i][2][1]++;
487 }
488 }
489 }
490 break;
491 default:
492 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
493 return -1;
494 }
495 }
496
497 s->mb_intra = 0;
498 if (HAS_CBP(mb_type)) {
499 s->dsp.clear_blocks(s->block[0]);
500
501 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
502 if(mb_block_count > 6){
503 cbp<<= mb_block_count-6;
504 cbp |= get_bits(&s->gb, mb_block_count-6);
505 s->dsp.clear_blocks(s->block[6]);
506 }
507 if (cbp <= 0){
508 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
509 return -1;
510 }
511
512 //if 1, we memcpy blocks in xvmcvideo
513 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
514 ff_xvmc_pack_pblocks(s,cbp);
515 if(s->swap_uv){
516 exchange_uv(s);
517 }
518 }
519
520 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
521 if(s->flags2 & CODEC_FLAG2_FAST){
522 for(i=0;i<6;i++) {
523 if(cbp & 32) {
524 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
525 } else {
526 s->block_last_index[i] = -1;
527 }
528 cbp+=cbp;
529 }
530 }else{
531 cbp<<= 12-mb_block_count;
532
533 for(i=0;i<mb_block_count;i++) {
534 if ( cbp & (1<<11) ) {
535 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
536 return -1;
537 } else {
538 s->block_last_index[i] = -1;
539 }
540 cbp+=cbp;
541 }
542 }
543 } else {
544 if(s->flags2 & CODEC_FLAG2_FAST){
545 for(i=0;i<6;i++) {
546 if (cbp & 32) {
547 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
548 } else {
549 s->block_last_index[i] = -1;
550 }
551 cbp+=cbp;
552 }
553 }else{
554 for(i=0;i<6;i++) {
555 if (cbp & 32) {
556 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
557 return -1;
558 } else {
559 s->block_last_index[i] = -1;
560 }
561 cbp+=cbp;
562 }
563 }
564 }
565 }else{
566 for(i=0;i<12;i++)
567 s->block_last_index[i] = -1;
568 }
569 }
570
571 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
572
573 return 0;
574 }
575
576 /* as H.263, but only 17 codes */
577 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
578 {
579 int code, sign, val, l, shift;
580
581 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
582 if (code == 0) {
583 return pred;
584 }
585 if (code < 0) {
586 return 0xffff;
587 }
588
589 sign = get_bits1(&s->gb);
590 shift = fcode - 1;
591 val = code;
592 if (shift) {
593 val = (val - 1) << shift;
594 val |= get_bits(&s->gb, shift);
595 val++;
596 }
597 if (sign)
598 val = -val;
599 val += pred;
600
601 /* modulo decoding */
602 l= INT_BIT - 5 - shift;
603 val = (val<<l)>>l;
604 return val;
605 }
606
607 inline int ff_mpeg1_decode_block_intra(MpegEncContext *s,
608 DCTELEM *block,
609 int n)
610 {
611 int level, dc, diff, i, j, run;
612 int component;
613 RLTable *rl = &ff_rl_mpeg1;
614 uint8_t * const scantable= s->intra_scantable.permutated;
615 const uint16_t *quant_matrix= s->intra_matrix;
616 const int qscale= s->qscale;
617
618 /* DC coefficient */
619 component = (n <= 3 ? 0 : n - 4 + 1);
620 diff = decode_dc(&s->gb, component);
621 if (diff >= 0xffff)
622 return -1;
623 dc = s->last_dc[component];
624 dc += diff;
625 s->last_dc[component] = dc;
626 block[0] = dc*quant_matrix[0];
627 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
628 i = 0;
629 {
630 OPEN_READER(re, &s->gb);
631 /* now quantify & encode AC coefficients */
632 for(;;) {
633 UPDATE_CACHE(re, &s->gb);
634 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
635
636 if(level == 127){
637 break;
638 } else if(level != 0) {
639 i += run;
640 j = scantable[i];
641 level= (level*qscale*quant_matrix[j])>>4;
642 level= (level-1)|1;
643 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
644 LAST_SKIP_BITS(re, &s->gb, 1);
645 } else {
646 /* escape */
647 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
648 UPDATE_CACHE(re, &s->gb);
649 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
650 if (level == -128) {
651 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
652 } else if (level == 0) {
653 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
654 }
655 i += run;
656 j = scantable[i];
657 if(level<0){
658 level= -level;
659 level= (level*qscale*quant_matrix[j])>>4;
660 level= (level-1)|1;
661 level= -level;
662 }else{
663 level= (level*qscale*quant_matrix[j])>>4;
664 level= (level-1)|1;
665 }
666 }
667 if (i > 63){
668 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
669 return -1;
670 }
671
672 block[j] = level;
673 }
674 CLOSE_READER(re, &s->gb);
675 }
676 s->block_last_index[n] = i;
677 return 0;
678 }
679
680 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
681 DCTELEM *block,
682 int n)
683 {
684 int level, i, j, run;
685 RLTable *rl = &ff_rl_mpeg1;
686 uint8_t * const scantable= s->intra_scantable.permutated;
687 const uint16_t *quant_matrix= s->inter_matrix;
688 const int qscale= s->qscale;
689
690 {
691 OPEN_READER(re, &s->gb);
692 i = -1;
693 // special case for first coefficient, no need to add second VLC table
694 UPDATE_CACHE(re, &s->gb);
695 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
696 level= (3*qscale*quant_matrix[0])>>5;
697 level= (level-1)|1;
698 if(GET_CACHE(re, &s->gb)&0x40000000)
699 level= -level;
700 block[0] = level;
701 i++;
702 SKIP_BITS(re, &s->gb, 2);
703 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
704 goto end;
705 }
706 #if MIN_CACHE_BITS < 19
707 UPDATE_CACHE(re, &s->gb);
708 #endif
709 /* now quantify & encode AC coefficients */
710 for(;;) {
711 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
712
713 if(level != 0) {
714 i += run;
715 j = scantable[i];
716 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
717 level= (level-1)|1;
718 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
719 SKIP_BITS(re, &s->gb, 1);
720 } else {
721 /* escape */
722 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
723 UPDATE_CACHE(re, &s->gb);
724 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
725 if (level == -128) {
726 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
727 } else if (level == 0) {
728 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
729 }
730 i += run;
731 j = scantable[i];
732 if(level<0){
733 level= -level;
734 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
735 level= (level-1)|1;
736 level= -level;
737 }else{
738 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
739 level= (level-1)|1;
740 }
741 }
742 if (i > 63){
743 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
744 return -1;
745 }
746
747 block[j] = level;
748 #if MIN_CACHE_BITS < 19
749 UPDATE_CACHE(re, &s->gb);
750 #endif
751 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
752 break;
753 #if MIN_CACHE_BITS >= 19
754 UPDATE_CACHE(re, &s->gb);
755 #endif
756 }
757 end:
758 LAST_SKIP_BITS(re, &s->gb, 2);
759 CLOSE_READER(re, &s->gb);
760 }
761 s->block_last_index[n] = i;
762 return 0;
763 }
764
765 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
766 {
767 int level, i, j, run;
768 RLTable *rl = &ff_rl_mpeg1;
769 uint8_t * const scantable= s->intra_scantable.permutated;
770 const int qscale= s->qscale;
771
772 {
773 OPEN_READER(re, &s->gb);
774 i = -1;
775 // special case for first coefficient, no need to add second VLC table
776 UPDATE_CACHE(re, &s->gb);
777 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
778 level= (3*qscale)>>1;
779 level= (level-1)|1;
780 if(GET_CACHE(re, &s->gb)&0x40000000)
781 level= -level;
782 block[0] = level;
783 i++;
784 SKIP_BITS(re, &s->gb, 2);
785 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
786 goto end;
787 }
788 #if MIN_CACHE_BITS < 19
789 UPDATE_CACHE(re, &s->gb);
790 #endif
791
792 /* now quantify & encode AC coefficients */
793 for(;;) {
794 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
795
796 if(level != 0) {
797 i += run;
798 j = scantable[i];
799 level= ((level*2+1)*qscale)>>1;
800 level= (level-1)|1;
801 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
802 SKIP_BITS(re, &s->gb, 1);
803 } else {
804 /* escape */
805 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
806 UPDATE_CACHE(re, &s->gb);
807 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
808 if (level == -128) {
809 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
810 } else if (level == 0) {
811 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
812 }
813 i += run;
814 j = scantable[i];
815 if(level<0){
816 level= -level;
817 level= ((level*2+1)*qscale)>>1;
818 level= (level-1)|1;
819 level= -level;
820 }else{
821 level= ((level*2+1)*qscale)>>1;
822 level= (level-1)|1;
823 }
824 }
825
826 block[j] = level;
827 #if MIN_CACHE_BITS < 19
828 UPDATE_CACHE(re, &s->gb);
829 #endif
830 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
831 break;
832 #if MIN_CACHE_BITS >= 19
833 UPDATE_CACHE(re, &s->gb);
834 #endif
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 #if MIN_CACHE_BITS < 19
880 UPDATE_CACHE(re, &s->gb);
881 #endif
882
883 /* now quantify & encode AC coefficients */
884 for(;;) {
885 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
886
887 if(level != 0) {
888 i += run;
889 j = scantable[i];
890 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
891 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
892 SKIP_BITS(re, &s->gb, 1);
893 } else {
894 /* escape */
895 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
896 UPDATE_CACHE(re, &s->gb);
897 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
898
899 i += run;
900 j = scantable[i];
901 if(level<0){
902 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
903 level= -level;
904 }else{
905 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
906 }
907 }
908 if (i > 63){
909 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
910 return -1;
911 }
912
913 mismatch ^= level;
914 block[j] = level;
915 #if MIN_CACHE_BITS < 19
916 UPDATE_CACHE(re, &s->gb);
917 #endif
918 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
919 break;
920 #if MIN_CACHE_BITS >= 19
921 UPDATE_CACHE(re, &s->gb);
922 #endif
923 }
924 end:
925 LAST_SKIP_BITS(re, &s->gb, 2);
926 CLOSE_READER(re, &s->gb);
927 }
928 block[63] ^= (mismatch & 1);
929
930 s->block_last_index[n] = i;
931 return 0;
932 }
933
934 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
935 DCTELEM *block,
936 int n)
937 {
938 int level, i, j, run;
939 RLTable *rl = &ff_rl_mpeg1;
940 uint8_t * const scantable= s->intra_scantable.permutated;
941 const int qscale= s->qscale;
942 OPEN_READER(re, &s->gb);
943 i = -1;
944
945 // special case for first coefficient, no need to add second VLC table
946 UPDATE_CACHE(re, &s->gb);
947 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
948 level= (3*qscale)>>1;
949 if(GET_CACHE(re, &s->gb)&0x40000000)
950 level= -level;
951 block[0] = level;
952 i++;
953 SKIP_BITS(re, &s->gb, 2);
954 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
955 goto end;
956 }
957 #if MIN_CACHE_BITS < 19
958 UPDATE_CACHE(re, &s->gb);
959 #endif
960
961 /* now quantify & encode AC coefficients */
962 for(;;) {
963 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
964
965 if(level != 0) {
966 i += run;
967 j = scantable[i];
968 level= ((level*2+1)*qscale)>>1;
969 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
970 SKIP_BITS(re, &s->gb, 1);
971 } else {
972 /* escape */
973 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
974 UPDATE_CACHE(re, &s->gb);
975 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
976
977 i += run;
978 j = scantable[i];
979 if(level<0){
980 level= ((-level*2+1)*qscale)>>1;
981 level= -level;
982 }else{
983 level= ((level*2+1)*qscale)>>1;
984 }
985 }
986
987 block[j] = level;
988 #if MIN_CACHE_BITS < 19
989 UPDATE_CACHE(re, &s->gb);
990 #endif
991 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
992 break;
993 #if MIN_CACHE_BITS >=19
994 UPDATE_CACHE(re, &s->gb);
995 #endif
996 }
997 end:
998 LAST_SKIP_BITS(re, &s->gb, 2);
999 CLOSE_READER(re, &s->gb);
1000 s->block_last_index[n] = i;
1001 return 0;
1002 }
1003
1004
1005 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1006 DCTELEM *block,
1007 int n)
1008 {
1009 int level, dc, diff, i, j, run;
1010 int component;
1011 RLTable *rl;
1012 uint8_t * const scantable= s->intra_scantable.permutated;
1013 const uint16_t *quant_matrix;
1014 const int qscale= s->qscale;
1015 int mismatch;
1016
1017 /* DC coefficient */
1018 if (n < 4){
1019 quant_matrix = s->intra_matrix;
1020 component = 0;
1021 }else{
1022 quant_matrix = s->chroma_intra_matrix;
1023 component = (n&1) + 1;
1024 }
1025 diff = decode_dc(&s->gb, component);
1026 if (diff >= 0xffff)
1027 return -1;
1028 dc = s->last_dc[component];
1029 dc += diff;
1030 s->last_dc[component] = dc;
1031 block[0] = dc << (3 - s->intra_dc_precision);
1032 dprintf(s->avctx, "dc=%d\n", block[0]);
1033 mismatch = block[0] ^ 1;
1034 i = 0;
1035 if (s->intra_vlc_format)
1036 rl = &ff_rl_mpeg2;
1037 else
1038 rl = &ff_rl_mpeg1;
1039
1040 {
1041 OPEN_READER(re, &s->gb);
1042 /* now quantify & encode AC coefficients */
1043 for(;;) {
1044 UPDATE_CACHE(re, &s->gb);
1045 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1046
1047 if(level == 127){
1048 break;
1049 } else if(level != 0) {
1050 i += run;
1051 j = scantable[i];
1052 level= (level*qscale*quant_matrix[j])>>4;
1053 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1054 LAST_SKIP_BITS(re, &s->gb, 1);
1055 } else {
1056 /* escape */
1057 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1058 UPDATE_CACHE(re, &s->gb);
1059 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1060 i += run;
1061 j = scantable[i];
1062 if(level<0){
1063 level= (-level*qscale*quant_matrix[j])>>4;
1064 level= -level;
1065 }else{
1066 level= (level*qscale*quant_matrix[j])>>4;
1067 }
1068 }
1069 if (i > 63){
1070 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1071 return -1;
1072 }
1073
1074 mismatch^= level;
1075 block[j] = level;
1076 }
1077 CLOSE_READER(re, &s->gb);
1078 }
1079 block[63]^= mismatch&1;
1080
1081 s->block_last_index[n] = i;
1082 return 0;
1083 }
1084
1085 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1086 DCTELEM *block,
1087 int n)
1088 {
1089 int level, dc, diff, j, run;
1090 int component;
1091 RLTable *rl;
1092 uint8_t * scantable= s->intra_scantable.permutated;
1093 const uint16_t *quant_matrix;
1094 const int qscale= s->qscale;
1095
1096 /* DC coefficient */
1097 if (n < 4){
1098 quant_matrix = s->intra_matrix;
1099 component = 0;
1100 }else{
1101 quant_matrix = s->chroma_intra_matrix;
1102 component = (n&1) + 1;
1103 }
1104 diff = decode_dc(&s->gb, component);
1105 if (diff >= 0xffff)
1106 return -1;
1107 dc = s->last_dc[component];
1108 dc += diff;
1109 s->last_dc[component] = dc;
1110 block[0] = dc << (3 - s->intra_dc_precision);
1111 if (s->intra_vlc_format)
1112 rl = &ff_rl_mpeg2;
1113 else
1114 rl = &ff_rl_mpeg1;
1115
1116 {
1117 OPEN_READER(re, &s->gb);
1118 /* now quantify & encode AC coefficients */
1119 for(;;) {
1120 UPDATE_CACHE(re, &s->gb);
1121 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1122
1123 if(level == 127){
1124 break;
1125 } else if(level != 0) {
1126 scantable += run;
1127 j = *scantable;
1128 level= (level*qscale*quant_matrix[j])>>4;
1129 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1130 LAST_SKIP_BITS(re, &s->gb, 1);
1131 } else {
1132 /* escape */
1133 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1134 UPDATE_CACHE(re, &s->gb);
1135 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1136 scantable += run;
1137 j = *scantable;
1138 if(level<0){
1139 level= (-level*qscale*quant_matrix[j])>>4;
1140 level= -level;
1141 }else{
1142 level= (level*qscale*quant_matrix[j])>>4;
1143 }
1144 }
1145
1146 block[j] = level;
1147 }
1148 CLOSE_READER(re, &s->gb);
1149 }
1150
1151 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1152 return 0;
1153 }
1154
1155 typedef struct Mpeg1Context {
1156 MpegEncContext mpeg_enc_ctx;
1157 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1158 int repeat_field; /* true if we must repeat the field */
1159 AVPanScan pan_scan; /** some temporary storage for the panscan */
1160 int slice_count;
1161 int swap_uv;//indicate VCR2
1162 int save_aspect_info;
1163 int save_width, save_height, save_progressive_seq;
1164 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1165
1166 } Mpeg1Context;
1167
1168 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1169 {
1170 Mpeg1Context *s = avctx->priv_data;
1171 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1172 int i;
1173
1174 /* we need some permutation to store matrices,
1175 * until MPV_common_init() sets the real permutation. */
1176 for(i=0;i<64;i++)
1177 s2->dsp.idct_permutation[i]=i;
1178
1179 MPV_decode_defaults(s2);
1180
1181 s->mpeg_enc_ctx.avctx= avctx;
1182 s->mpeg_enc_ctx.flags= avctx->flags;
1183 s->mpeg_enc_ctx.flags2= avctx->flags2;
1184 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1185 ff_mpeg12_init_vlcs();
1186
1187 s->mpeg_enc_ctx_allocated = 0;
1188 s->mpeg_enc_ctx.picture_number = 0;
1189 s->repeat_field = 0;
1190 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1191 return 0;
1192 }
1193
1194 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1195 const uint8_t *new_perm){
1196 uint16_t temp_matrix[64];
1197 int i;
1198
1199 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1200
1201 for(i=0;i<64;i++){
1202 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1203 }
1204 }
1205
1206 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1207 Mpeg1Context *s1 = avctx->priv_data;
1208 MpegEncContext *s = &s1->mpeg_enc_ctx;
1209
1210 if(avctx->xvmc_acceleration)
1211 return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1212 else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1213 if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1214 return PIX_FMT_VDPAU_MPEG1;
1215 else
1216 return PIX_FMT_VDPAU_MPEG2;
1217 }else{
1218 if(s->chroma_format < 2)
1219 return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1220 else if(s->chroma_format == 2)
1221 return PIX_FMT_YUV422P;
1222 else
1223 return PIX_FMT_YUV444P;
1224 }
1225 }
1226
1227 /* Call this function when we know all parameters.
1228 * It may be called in different places for MPEG-1 and MPEG-2. */
1229 static int mpeg_decode_postinit(AVCodecContext *avctx){
1230 Mpeg1Context *s1 = avctx->priv_data;
1231 MpegEncContext *s = &s1->mpeg_enc_ctx;
1232 uint8_t old_permutation[64];
1233
1234 if (
1235 (s1->mpeg_enc_ctx_allocated == 0)||
1236 avctx->coded_width != s->width ||
1237 avctx->coded_height != s->height||
1238 s1->save_width != s->width ||
1239 s1->save_height != s->height ||
1240 s1->save_aspect_info != s->aspect_ratio_info||
1241 s1->save_progressive_seq != s->progressive_sequence ||
1242 0)
1243 {
1244
1245 if (s1->mpeg_enc_ctx_allocated) {
1246 ParseContext pc= s->parse_context;
1247 s->parse_context.buffer=0;
1248 MPV_common_end(s);
1249 s->parse_context= pc;
1250 }
1251
1252 if( (s->width == 0 )||(s->height == 0))
1253 return -2;
1254
1255 avcodec_set_dimensions(avctx, s->width, s->height);
1256 avctx->bit_rate = s->bit_rate;
1257 s1->save_aspect_info = s->aspect_ratio_info;
1258 s1->save_width = s->width;
1259 s1->save_height = s->height;
1260 s1->save_progressive_seq = s->progressive_sequence;
1261
1262 /* low_delay may be forced, in this case we will have B-frames
1263 * that behave like P-frames. */
1264 avctx->has_b_frames = !(s->low_delay);
1265
1266 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1267 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1268 //MPEG-1 fps
1269 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1270 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1271 //MPEG-1 aspect
1272 avctx->sample_aspect_ratio= av_d2q(
1273 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1274 avctx->ticks_per_frame=1;
1275 }else{//MPEG-2
1276 //MPEG-2 fps
1277 av_reduce(
1278 &s->avctx->time_base.den,
1279 &s->avctx->time_base.num,
1280 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1281 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1282 1<<30);
1283 avctx->ticks_per_frame=2;
1284 //MPEG-2 aspect
1285 if(s->aspect_ratio_info > 1){
1286 //we ignore the spec here as reality does not match the spec, see for example
1287 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1288 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1289 s->avctx->sample_aspect_ratio=
1290 av_div_q(
1291 ff_mpeg2_aspect[s->aspect_ratio_info],
1292 (AVRational){s->width, s->height}
1293 );
1294 }else{
1295 s->avctx->sample_aspect_ratio=
1296 av_div_q(
1297 ff_mpeg2_aspect[s->aspect_ratio_info],
1298 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1299 );
1300 }
1301 }else{
1302 s->avctx->sample_aspect_ratio=
1303 ff_mpeg2_aspect[s->aspect_ratio_info];
1304 }
1305 }//MPEG-2
1306
1307 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1308 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1309 //until then pix_fmt may be changed right after codec init
1310 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1311 avctx->hwaccel ||
1312 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1313 if( avctx->idct_algo == FF_IDCT_AUTO )
1314 avctx->idct_algo = FF_IDCT_SIMPLE;
1315
1316 /* Quantization matrices may need reordering
1317 * if DCT permutation is changed. */
1318 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1319
1320 if (MPV_common_init(s) < 0)
1321 return -2;
1322
1323 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1324 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1325 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1326 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1327
1328 s1->mpeg_enc_ctx_allocated = 1;
1329 }
1330 return 0;
1331 }
1332
1333 static int mpeg1_decode_picture(AVCodecContext *avctx,
1334 const uint8_t *buf, int buf_size)
1335 {
1336 Mpeg1Context *s1 = avctx->priv_data;
1337 MpegEncContext *s = &s1->mpeg_enc_ctx;
1338 int ref, f_code, vbv_delay;
1339
1340 if(mpeg_decode_postinit(s->avctx) < 0)
1341 return -2;
1342
1343 init_get_bits(&s->gb, buf, buf_size*8);
1344
1345 ref = get_bits(&s->gb, 10); /* temporal ref */
1346 s->pict_type = get_bits(&s->gb, 3);
1347 if(s->pict_type == 0 || s->pict_type > 3)
1348 return -1;
1349
1350 vbv_delay= get_bits(&s->gb, 16);
1351 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1352 s->full_pel[0] = get_bits1(&s->gb);
1353 f_code = get_bits(&s->gb, 3);
1354 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1355 return -1;
1356 s->mpeg_f_code[0][0] = f_code;
1357 s->mpeg_f_code[0][1] = f_code;
1358 }
1359 if (s->pict_type == FF_B_TYPE) {
1360 s->full_pel[1] = get_bits1(&s->gb);
1361 f_code = get_bits(&s->gb, 3);
1362 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1363 return -1;
1364 s->mpeg_f_code[1][0] = f_code;
1365 s->mpeg_f_code[1][1] = f_code;
1366 }
1367 s->current_picture.pict_type= s->pict_type;
1368 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1369
1370 if(avctx->debug & FF_DEBUG_PICT_INFO)
1371 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1372
1373 s->y_dc_scale = 8;
1374 s->c_dc_scale = 8;
1375 s->first_slice = 1;
1376 return 0;
1377 }
1378
1379 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1380 {
1381 MpegEncContext *s= &s1->mpeg_enc_ctx;
1382 int horiz_size_ext, vert_size_ext;
1383 int bit_rate_ext;
1384
1385 skip_bits(&s->gb, 1); /* profile and level esc*/
1386 s->avctx->profile= get_bits(&s->gb, 3);
1387 s->avctx->level= get_bits(&s->gb, 4);
1388 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1389 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1390 horiz_size_ext = get_bits(&s->gb, 2);
1391 vert_size_ext = get_bits(&s->gb, 2);
1392 s->width |= (horiz_size_ext << 12);
1393 s->height |= (vert_size_ext << 12);
1394 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1395 s->bit_rate += (bit_rate_ext << 18) * 400;
1396 skip_bits1(&s->gb); /* marker */
1397 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1398
1399 s->low_delay = get_bits1(&s->gb);
1400 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1401
1402 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1403 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1404
1405 dprintf(s->avctx, "sequence extension\n");
1406 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1407 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1408
1409 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1410 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1411 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1412
1413 }
1414
1415 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1416 {
1417 MpegEncContext *s= &s1->mpeg_enc_ctx;
1418 int color_description, w, h;
1419
1420 skip_bits(&s->gb, 3); /* video format */
1421 color_description= get_bits1(&s->gb);
1422 if(color_description){
1423 skip_bits(&s->gb, 8); /* color primaries */
1424 skip_bits(&s->gb, 8); /* transfer_characteristics */
1425 skip_bits(&s->gb, 8); /* matrix_coefficients */
1426 }
1427 w= get_bits(&s->gb, 14);
1428 skip_bits(&s->gb, 1); //marker
1429 h= get_bits(&s->gb, 14);
1430 skip_bits(&s->gb, 1); //marker
1431
1432 s1->pan_scan.width= 16*w;
1433 s1->pan_scan.height=16*h;
1434
1435 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1436 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1437 }
1438
1439 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1440 {
1441 MpegEncContext *s= &s1->mpeg_enc_ctx;
1442 int i,nofco;
1443
1444 nofco = 1;
1445 if(s->progressive_sequence){
1446 if(s->repeat_first_field){
1447 nofco++;
1448 if(s->top_field_first)
1449 nofco++;
1450 }
1451 }else{
1452 if(s->picture_structure == PICT_FRAME){
1453 nofco++;
1454 if(s->repeat_first_field)
1455 nofco++;
1456 }
1457 }
1458 for(i=0; i<nofco; i++){
1459 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1460 skip_bits(&s->gb, 1); //marker
1461 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1462 skip_bits(&s->gb, 1); //marker
1463 }
1464
1465 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1466 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1467 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1468 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1469 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1470 );
1471 }
1472
1473 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1474 {
1475 int i, v, j;
1476
1477 dprintf(s->avctx, "matrix extension\n");
1478
1479 if (get_bits1(&s->gb)) {
1480 for(i=0;i<64;i++) {
1481 v = get_bits(&s->gb, 8);
1482 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1483 s->intra_matrix[j] = v;
1484 s->chroma_intra_matrix[j] = v;
1485 }
1486 }
1487 if (get_bits1(&s->gb)) {
1488 for(i=0;i<64;i++) {
1489 v = get_bits(&s->gb, 8);
1490 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1491 s->inter_matrix[j] = v;
1492 s->chroma_inter_matrix[j] = v;
1493 }
1494 }
1495 if (get_bits1(&s->gb)) {
1496 for(i=0;i<64;i++) {
1497 v = get_bits(&s->gb, 8);
1498 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1499 s->chroma_intra_matrix[j] = v;
1500 }
1501 }
1502 if (get_bits1(&s->gb)) {
1503 for(i=0;i<64;i++) {
1504 v = get_bits(&s->gb, 8);
1505 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1506 s->chroma_inter_matrix[j] = v;
1507 }
1508 }
1509 }
1510
1511 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1512 {
1513 MpegEncContext *s= &s1->mpeg_enc_ctx;
1514
1515 s->full_pel[0] = s->full_pel[1] = 0;
1516 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1517 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1518 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1519 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1520 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1521 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1522 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1523 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1524 s->pict_type= FF_I_TYPE;
1525 else
1526 s->pict_type= FF_P_TYPE;
1527 }else
1528 s->pict_type= FF_B_TYPE;
1529 s->current_picture.pict_type= s->pict_type;
1530 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1531 s->first_slice= 1;
1532 }
1533 s->intra_dc_precision = get_bits(&s->gb, 2);
1534 s->picture_structure = get_bits(&s->gb, 2);
1535 s->top_field_first = get_bits1(&s->gb);
1536 s->frame_pred_frame_dct = get_bits1(&s->gb);
1537 s->concealment_motion_vectors = get_bits1(&s->gb);
1538 s->q_scale_type = get_bits1(&s->gb);
1539 s->intra_vlc_format = get_bits1(&s->gb);
1540 s->alternate_scan = get_bits1(&s->gb);
1541 s->repeat_first_field = get_bits1(&s->gb);
1542 s->chroma_420_type = get_bits1(&s->gb);
1543 s->progressive_frame = get_bits1(&s->gb);
1544
1545 if(s->picture_structure == PICT_FRAME){
1546 s->first_field=0;
1547 s->v_edge_pos= 16*s->mb_height;
1548 }else{
1549 s->first_field ^= 1;
1550 s->v_edge_pos= 8*s->mb_height;
1551 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1552 }
1553
1554 if(s->alternate_scan){
1555 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1556 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1557 }else{
1558 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1559 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1560 }
1561
1562 /* composite display not parsed */
1563 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1564 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1565 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1566 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1567 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1568 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1569 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1570 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1571 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1572 }
1573
1574 static void mpeg_decode_extension(AVCodecContext *avctx,
1575 const uint8_t *buf, int buf_size)
1576 {
1577 Mpeg1Context *s1 = avctx->priv_data;
1578 MpegEncContext *s = &s1->mpeg_enc_ctx;
1579 int ext_type;
1580
1581 init_get_bits(&s->gb, buf, buf_size*8);
1582
1583 ext_type = get_bits(&s->gb, 4);
1584 switch(ext_type) {
1585 case 0x1:
1586 mpeg_decode_sequence_extension(s1);
1587 break;
1588 case 0x2:
1589 mpeg_decode_sequence_display_extension(s1);
1590 break;
1591 case 0x3:
1592 mpeg_decode_quant_matrix_extension(s);
1593 break;
1594 case 0x7:
1595 mpeg_decode_picture_display_extension(s1);
1596 break;
1597 case 0x8:
1598 mpeg_decode_picture_coding_extension(s1);
1599 break;
1600 }
1601 }
1602
1603 static void exchange_uv(MpegEncContext *s){
1604 DCTELEM (*tmp)[64];
1605
1606 tmp = s->pblocks[4];
1607 s->pblocks[4] = s->pblocks[5];
1608 s->pblocks[5] = tmp;
1609 }
1610
1611 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1612 AVCodecContext *avctx= s->avctx;
1613 Mpeg1Context *s1 = (Mpeg1Context*)s;
1614
1615 /* start frame decoding */
1616 if(s->first_field || s->picture_structure==PICT_FRAME){
1617 if(MPV_frame_start(s, avctx) < 0)
1618 return -1;
1619
1620 ff_er_frame_start(s);
1621
1622 /* first check if we must repeat the frame */
1623 s->current_picture_ptr->repeat_pict = 0;
1624 if (s->repeat_first_field) {
1625 if (s->progressive_sequence) {
1626 if (s->top_field_first)
1627 s->current_picture_ptr->repeat_pict = 4;
1628 else
1629 s->current_picture_ptr->repeat_pict = 2;
1630 } else if (s->progressive_frame) {
1631 s->current_picture_ptr->repeat_pict = 1;
1632 }
1633 }
1634
1635 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1636 }else{ //second field
1637 int i;
1638
1639 if(!s->current_picture_ptr){
1640 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1641 return -1;
1642 }
1643
1644 for(i=0; i<4; i++){
1645 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1646 if(s->picture_structure == PICT_BOTTOM_FIELD){
1647 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1648 }
1649 }
1650 }
1651
1652 if (avctx->hwaccel) {
1653 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1654 return -1;
1655 }
1656
1657 // MPV_frame_start will call this function too,
1658 // but we need to call it on every field
1659 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1660 if(ff_xvmc_field_start(s,avctx) < 0)
1661 return -1;
1662
1663 return 0;
1664 }
1665
1666 #define DECODE_SLICE_ERROR -1
1667 #define DECODE_SLICE_OK 0
1668
1669 /**
1670 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1671 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1672 * DECODE_SLICE_OK if this slice is ok<br>
1673 */
1674 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1675 const uint8_t **buf, int buf_size)
1676 {
1677 MpegEncContext *s = &s1->mpeg_enc_ctx;
1678 AVCodecContext *avctx= s->avctx;
1679 const int field_pic= s->picture_structure != PICT_FRAME;
1680 const int lowres= s->avctx->lowres;
1681
1682 s->resync_mb_x=
1683 s->resync_mb_y= -1;
1684
1685 if (mb_y<<field_pic >= s->mb_height){
1686 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1687 return -1;
1688 }
1689
1690 init_get_bits(&s->gb, *buf, buf_size*8);
1691
1692 ff_mpeg1_clean_buffers(s);
1693 s->interlaced_dct = 0;
1694
1695 s->qscale = get_qscale(s);
1696
1697 if(s->qscale == 0){
1698 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1699 return -1;
1700 }
1701
1702 /* extra slice info */
1703 while (get_bits1(&s->gb) != 0) {
1704 skip_bits(&s->gb, 8);
1705 }
1706
1707 s->mb_x=0;
1708
1709 if (avctx->hwaccel) {
1710 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1711 int start_code = -1;
1712 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1713 if (buf_end < *buf + buf_size)
1714 buf_end -= 4;
1715 s->mb_y = mb_y;
1716 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1717 return DECODE_SLICE_ERROR;
1718 *buf = buf_end;
1719 return DECODE_SLICE_OK;
1720 }
1721
1722 for(;;) {
1723 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1724 if (code < 0){
1725 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1726 return -1;
1727 }
1728 if (code >= 33) {
1729 if (code == 33) {
1730 s->mb_x += 33;
1731 }
1732 /* otherwise, stuffing, nothing to do */
1733 } else {
1734 s->mb_x += code;
1735 break;
1736 }
1737 }
1738 if(s->mb_x >= (unsigned)s->mb_width){
1739 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1740 return -1;
1741 }
1742
1743 s->resync_mb_x= s->mb_x;
1744 s->resync_mb_y= s->mb_y= mb_y;
1745 s->mb_skip_run= 0;
1746 ff_init_block_index(s);
1747
1748 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1749 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1750 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",
1751 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],
1752 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1753 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1754 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1755 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1756 }
1757 }
1758
1759 for(;;) {
1760 //If 1, we memcpy blocks in xvmcvideo.
1761 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1762 ff_xvmc_init_block(s);//set s->block
1763
1764 if(mpeg_decode_mb(s, s->block) < 0)
1765 return -1;
1766
1767 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1768 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1769 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1770 int motion_x, motion_y, dir, i;
1771 if(field_pic && !s->first_field)
1772 xy += wrap/2;
1773
1774 for(i=0; i<2; i++){
1775 for(dir=0; dir<2; dir++){
1776 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1777 motion_x = motion_y = 0;
1778 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1779 motion_x = s->mv[dir][0][0];
1780 motion_y = s->mv[dir][0][1];
1781 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1782 motion_x = s->mv[dir][i][0];
1783 motion_y = s->mv[dir][i][1];
1784 }
1785
1786 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1787 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1788 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1789 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1790 s->current_picture.ref_index [dir][xy ]=
1791 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1792 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1793 }
1794 xy += wrap;
1795 }
1796 }
1797
1798 s->dest[0] += 16 >> lowres;
1799 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1800 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1801
1802 MPV_decode_mb(s, s->block);
1803
1804 if (++s->mb_x >= s->mb_width) {
1805 const int mb_size= 16>>s->avctx->lowres;
1806
1807 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1808
1809 s->mb_x = 0;
1810 s->mb_y++;
1811
1812 if(s->mb_y<<field_pic >= s->mb_height){
1813 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1814 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1815 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1816 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1817
1818 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1819 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1820 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1821 return -1;
1822 }else
1823 goto eos;
1824 }
1825
1826 ff_init_block_index(s);
1827 }
1828
1829 /* skip mb handling */
1830 if (s->mb_skip_run == -1) {
1831 /* read increment again */
1832 s->mb_skip_run = 0;
1833 for(;;) {
1834 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1835 if (code < 0){
1836 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1837 return -1;
1838 }
1839 if (code >= 33) {
1840 if (code == 33) {
1841 s->mb_skip_run += 33;
1842 }else if(code == 35){
1843 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1844 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1845 return -1;
1846 }
1847 goto eos; /* end of slice */
1848 }
1849 /* otherwise, stuffing, nothing to do */
1850 } else {
1851 s->mb_skip_run += code;
1852 break;
1853 }
1854 }
1855 if(s->mb_skip_run){
1856 int i;
1857 if(s->pict_type == FF_I_TYPE){
1858 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1859 return -1;
1860 }
1861
1862 /* skip mb */
1863 s->mb_intra = 0;
1864 for(i=0;i<12;i++)
1865 s->block_last_index[i] = -1;
1866 if(s->picture_structure == PICT_FRAME)
1867 s->mv_type = MV_TYPE_16X16;
1868 else
1869 s->mv_type = MV_TYPE_FIELD;
1870 if (s->pict_type == FF_P_TYPE) {
1871 /* if P type, zero motion vector is implied */
1872 s->mv_dir = MV_DIR_FORWARD;
1873 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1874 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1875 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1876 s->field_select[0][0]= s->picture_structure - 1;
1877 } else {
1878 /* if B type, reuse previous vectors and directions */
1879 s->mv[0][0][0] = s->last_mv[0][0][0];
1880 s->mv[0][0][1] = s->last_mv[0][0][1];
1881 s->mv[1][0][0] = s->last_mv[1][0][0];
1882 s->mv[1][0][1] = s->last_mv[1][0][1];
1883 }
1884 }
1885 }
1886 }
1887 eos: // end of slice
1888 *buf += (get_bits_count(&s->gb)-1)/8;
1889 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1890 return 0;
1891 }
1892
1893 static int slice_decode_thread(AVCodecContext *c, void *arg){
1894 MpegEncContext *s= *(void**)arg;
1895 const uint8_t *buf= s->gb.buffer;
1896 int mb_y= s->start_mb_y;
1897
1898 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1899
1900 for(;;){
1901 uint32_t start_code;
1902 int ret;
1903
1904 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1905 emms_c();
1906 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1907 //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);
1908 if(ret < 0){
1909 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1910 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);
1911 }else{
1912 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);
1913 }
1914
1915 if(s->mb_y == s->end_mb_y)
1916 return 0;
1917
1918 start_code= -1;
1919 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1920 mb_y= start_code - SLICE_MIN_START_CODE;
1921 if(mb_y < 0 || mb_y >= s->end_mb_y)
1922 return -1;
1923 }
1924
1925 return 0; //not reached
1926 }
1927
1928 /**
1929 * Handles slice ends.
1930 * @return 1 if it seems to be the last slice
1931 */
1932 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1933 {
1934 Mpeg1Context *s1 = avctx->priv_data;
1935 MpegEncContext *s = &s1->mpeg_enc_ctx;
1936
1937 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1938 return 0;
1939
1940 if (s->avctx->hwaccel) {
1941 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1942 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1943 }
1944
1945 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1946 ff_xvmc_field_end(s);
1947
1948 /* end of slice reached */
1949 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1950 /* end of image */
1951
1952 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1953
1954 ff_er_frame_end(s);
1955
1956 MPV_frame_end(s);
1957
1958 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1959 *pict= *(AVFrame*)s->current_picture_ptr;
1960 ff_print_debug_info(s, pict);
1961 } else {
1962 s->picture_number++;
1963 /* latency of 1 frame for I- and P-frames */
1964 /* XXX: use another variable than picture_number */
1965 if (s->last_picture_ptr != NULL) {
1966 *pict= *(AVFrame*)s->last_picture_ptr;
1967 ff_print_debug_info(s, pict);
1968 }
1969 }
1970
1971 return 1;
1972 } else {
1973 return 0;
1974 }
1975 }
1976
1977 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1978 const uint8_t *buf, int buf_size)
1979 {
1980 Mpeg1Context *s1 = avctx->priv_data;
1981 MpegEncContext *s = &s1->mpeg_enc_ctx;
1982 int width,height;
1983 int i, v, j;
1984
1985 init_get_bits(&s->gb, buf, buf_size*8);
1986
1987 width = get_bits(&s->gb, 12);
1988 height = get_bits(&s->gb, 12);
1989 if (width <= 0 || height <= 0)
1990 return -1;
1991 s->aspect_ratio_info= get_bits(&s->gb, 4);
1992 if (s->aspect_ratio_info == 0) {
1993 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1994 if (avctx->error_recognition >= FF_ER_COMPLIANT)
1995 return -1;
1996 }
1997 s->frame_rate_index = get_bits(&s->gb, 4);
1998 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1999 return -1;
2000 s->bit_rate = get_bits(&s->gb, 18) * 400;
2001 if (get_bits1(&s->gb) == 0) /* marker */
2002 return -1;
2003 s->width = width;
2004 s->height = height;
2005
2006 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2007 skip_bits(&s->gb, 1);
2008
2009 /* get matrix */
2010 if (get_bits1(&s->gb)) {
2011 for(i=0;i<64;i++) {
2012 v = get_bits(&s->gb, 8);
2013 if(v==0){
2014 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2015 return -1;
2016 }
2017 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2018 s->intra_matrix[j] = v;
2019 s->chroma_intra_matrix[j] = v;
2020 }
2021 #ifdef DEBUG
2022 dprintf(s->avctx, "intra matrix present\n");
2023 for(i=0;i<64;i++)
2024 dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2025 dprintf(s->avctx, "\n");
2026 #endif
2027 } else {
2028 for(i=0;i<64;i++) {
2029 j = s->dsp.idct_permutation[i];
2030 v = ff_mpeg1_default_intra_matrix[i];
2031 s->intra_matrix[j] = v;
2032 s->chroma_intra_matrix[j] = v;
2033 }
2034 }
2035 if (get_bits1(&s->gb)) {
2036 for(i=0;i<64;i++) {
2037 v = get_bits(&s->gb, 8);
2038 if(v==0){
2039 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2040 return -1;
2041 }
2042 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2043 s->inter_matrix[j] = v;
2044 s->chroma_inter_matrix[j] = v;
2045 }
2046 #ifdef DEBUG
2047 dprintf(s->avctx, "non-intra matrix present\n");
2048 for(i=0;i<64;i++)
2049 dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2050 dprintf(s->avctx, "\n");
2051 #endif
2052 } else {
2053 for(i=0;i<64;i++) {
2054 int j= s->dsp.idct_permutation[i];
2055 v = ff_mpeg1_default_non_intra_matrix[i];
2056 s->inter_matrix[j] = v;
2057 s->chroma_inter_matrix[j] = v;
2058 }
2059 }
2060
2061 if(show_bits(&s->gb, 23) != 0){
2062 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2063 return -1;
2064 }
2065
2066 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2067 s->progressive_sequence = 1;
2068 s->progressive_frame = 1;
2069 s->picture_structure = PICT_FRAME;
2070 s->frame_pred_frame_dct = 1;
2071 s->chroma_format = 1;
2072 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2073 avctx->sub_id = 1; /* indicates MPEG-1 */
2074 s->out_format = FMT_MPEG1;
2075 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2076 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2077
2078 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2079 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2080 s->avctx->rc_buffer_size, s->bit_rate);
2081
2082 return 0;
2083 }
2084
2085 static int vcr2_init_sequence(AVCodecContext *avctx)
2086 {
2087 Mpeg1Context *s1 = avctx->priv_data;
2088 MpegEncContext *s = &s1->mpeg_enc_ctx;
2089 int i, v;
2090
2091 /* start new MPEG-1 context decoding */
2092 s->out_format = FMT_MPEG1;
2093 if (s1->mpeg_enc_ctx_allocated) {
2094 MPV_common_end(s);
2095 }
2096 s->width = avctx->coded_width;
2097 s->height = avctx->coded_height;
2098 avctx->has_b_frames= 0; //true?
2099 s->low_delay= 1;
2100
2101 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2102 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2103
2104 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2105 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2106 if( avctx->idct_algo == FF_IDCT_AUTO )
2107 avctx->idct_algo = FF_IDCT_SIMPLE;
2108
2109 if (MPV_common_init(s) < 0)
2110 return -1;
2111 exchange_uv(s);//common init reset pblocks, so we swap them here
2112 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2113 s1->mpeg_enc_ctx_allocated = 1;
2114
2115 for(i=0;i<64;i++) {
2116 int j= s->dsp.idct_permutation[i];
2117 v = ff_mpeg1_default_intra_matrix[i];
2118 s->intra_matrix[j] = v;
2119 s->chroma_intra_matrix[j] = v;
2120
2121 v = ff_mpeg1_default_non_intra_matrix[i];
2122 s->inter_matrix[j] = v;
2123 s->chroma_inter_matrix[j] = v;
2124 }
2125
2126 s->progressive_sequence = 1;
2127 s->progressive_frame = 1;
2128 s->picture_structure = PICT_FRAME;
2129 s->frame_pred_frame_dct = 1;
2130 s->chroma_format = 1;
2131 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2132 avctx->sub_id = 2; /* indicates MPEG-2 */
2133 return 0;
2134 }
2135
2136
2137 static void mpeg_decode_user_data(AVCodecContext *avctx,
2138 const uint8_t *buf, int buf_size)
2139 {
2140 const uint8_t *p;
2141 int len, flags;
2142 p = buf;
2143 len = buf_size;
2144
2145 /* we parse the DTG active format information */
2146 if (len >= 5 &&
2147 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2148 flags = p[4];
2149 p += 5;
2150 len -= 5;
2151 if (flags & 0x80) {
2152 /* skip event id */
2153 if (len < 2)
2154 return;
2155 p += 2;
2156 len -= 2;
2157 }
2158 if (flags & 0x40) {
2159 if (len < 1)
2160 return;
2161 avctx->dtg_active_format = p[0] & 0x0f;
2162 }
2163 }
2164 }
2165
2166 static void mpeg_decode_gop(AVCodecContext *avctx,
2167 const uint8_t *buf, int buf_size){
2168 Mpeg1Context *s1 = avctx->priv_data;
2169 MpegEncContext *s = &s1->mpeg_enc_ctx;
2170
2171 int drop_frame_flag;
2172 int time_code_hours, time_code_minutes;
2173 int time_code_seconds, time_code_pictures;
2174 int closed_gop, broken_link;
2175
2176 init_get_bits(&s->gb, buf, buf_size*8);
2177
2178 drop_frame_flag = get_bits1(&s->gb);
2179
2180 time_code_hours=get_bits(&s->gb,5);
2181 time_code_minutes = get_bits(&s->gb,6);
2182 skip_bits1(&s->gb);//marker bit
2183 time_code_seconds = get_bits(&s->gb,6);
2184 time_code_pictures = get_bits(&s->gb,6);
2185
2186 closed_gop = get_bits1(&s->gb);
2187 /*broken_link indicate that after editing the
2188 reference frames of the first B-Frames after GOP I-Frame
2189 are missing (open gop)*/
2190 broken_link = get_bits1(&s->gb);
2191
2192 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2193 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2194 time_code_hours, time_code_minutes, time_code_seconds,
2195 time_code_pictures, closed_gop, broken_link);
2196 }
2197 /**
2198 * Finds the end of the current frame in the bitstream.
2199 * @return the position of the first byte of the next frame, or -1
2200 */
2201 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2202 {
2203 int i;
2204 uint32_t state= pc->state;
2205
2206 /* EOF considered as end of frame */
2207 if (buf_size == 0)
2208 return 0;
2209
2210 /*
2211 0 frame start -> 1/4
2212 1 first_SEQEXT -> 0/2
2213 2 first field start -> 3/0
2214 3 second_SEQEXT -> 2/0
2215 4 searching end
2216 */
2217
2218 for(i=0; i<buf_size; i++){
2219 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2220 if(pc->frame_start_found&1){
2221 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2222 pc->frame_start_found--;
2223 else if(state == EXT_START_CODE+2){
2224 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2225 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2226 }
2227 state++;
2228 }else{
2229 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2230 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2231 i++;
2232 pc->frame_start_found=4;
2233 }
2234 if(state == SEQ_END_CODE){
2235 pc->state=-1;
2236 return i+1;
2237 }
2238 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2239 pc->frame_start_found= 0;
2240 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2241 pc->frame_start_found++;
2242 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2243 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2244 pc->frame_start_found=0;
2245 pc->state=-1;
2246 return i-3;
2247 }
2248 }
2249 if(s && state == PICTURE_START_CODE){
2250 ff_fetch_timestamp(s, i-4, 1);
2251 }
2252 }
2253 }
2254 pc->state= state;
2255 return END_NOT_FOUND;
2256 }
2257
2258 static int decode_chunks(AVCodecContext *avctx,
2259 AVFrame *picture, int *data_size,
2260 const uint8_t *buf, int buf_size);
2261
2262 /* handle buffering and image synchronisation */
2263 static int mpeg_decode_frame(AVCodecContext *avctx,
2264 void *data, int *data_size,
2265 AVPacket *avpkt)
2266 {
2267 const uint8_t *buf = avpkt->data;
2268 int buf_size = avpkt->size;
2269 Mpeg1Context *s = avctx->priv_data;
2270 AVFrame *picture = data;
2271 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2272 dprintf(avctx, "fill_buffer\n");
2273
2274 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2275 /* special case for last picture */
2276 if (s2->low_delay==0 && s2->next_picture_ptr) {
2277 *picture= *(AVFrame*)s2->next_picture_ptr;
2278 s2->next_picture_ptr= NULL;
2279
2280 *data_size = sizeof(AVFrame);
2281 }
2282 return buf_size;
2283 }
2284
2285 if(s2->flags&CODEC_FLAG_TRUNCATED){
2286 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2287
2288 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2289 return buf_size;
2290 }
2291
2292 #if 0
2293 if (s->repeat_field % 2 == 1) {
2294 s->repeat_field++;
2295 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2296 // s2->picture_number, s->repeat_field);
2297 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2298 *data_size = sizeof(AVPicture);
2299 goto the_end;
2300 }
2301 }
2302 #endif
2303
2304 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2305 vcr2_init_sequence(avctx);
2306
2307 s->slice_count= 0;
2308
2309 if(avctx->extradata && !avctx->frame_number)
2310 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2311
2312 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2313 }
2314
2315 static int decode_chunks(AVCodecContext *avctx,
2316 AVFrame *picture, int *data_size,
2317 const uint8_t *buf, int buf_size)
2318 {
2319 Mpeg1Context *s = avctx->priv_data;
2320 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2321 const uint8_t *buf_ptr = buf;
2322 const uint8_t *buf_end = buf + buf_size;
2323 int ret, input_size;
2324
2325 for(;;) {
2326 /* find next start code */
2327 uint32_t start_code = -1;
2328 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2329 if (start_code > 0x1ff){
2330 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2331 if(avctx->thread_count > 1){
2332 int i;
2333
2334 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2335 for(i=0; i<s->slice_count; i++)
2336 s2->error_count += s2->thread_context[i]->error_count;
2337 }
2338
2339 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2340 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2341
2342 if (slice_end(avctx, picture)) {
2343 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2344 *data_size = sizeof(AVPicture);
2345 }
2346 }
2347 s2->pict_type= 0;
2348 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2349 }
2350
2351 input_size = buf_end - buf_ptr;
2352
2353 if(avctx->debug & FF_DEBUG_STARTCODE){
2354 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2355 }
2356
2357 /* prepare data for next start code */
2358 switch(start_code) {
2359 case SEQ_START_CODE:
2360 mpeg1_decode_sequence(avctx, buf_ptr,
2361 input_size);
2362 break;
2363
2364 case PICTURE_START_CODE:
2365 /* we have a complete image: we try to decompress it */
2366 if(mpeg1_decode_picture(avctx,
2367 buf_ptr, input_size) < 0)
2368 s2->pict_type=0;
2369 break;
2370 case EXT_START_CODE:
2371 mpeg_decode_extension(avctx,
2372 buf_ptr, input_size);
2373 break;
2374 case USER_START_CODE:
2375 mpeg_decode_user_data(avctx,
2376 buf_ptr, input_size);
2377 break;
2378 case GOP_START_CODE:
2379 s2->first_field=0;
2380 mpeg_decode_gop(avctx,
2381 buf_ptr, input_size);
2382 break;
2383 default:
2384 if (start_code >= SLICE_MIN_START_CODE &&
2385 start_code <= SLICE_MAX_START_CODE) {
2386 int mb_y= start_code - SLICE_MIN_START_CODE;
2387
2388 if(s2->last_picture_ptr==NULL){
2389 /* Skip B-frames if we do not have reference frames. */
2390 if(s2->pict_type==FF_B_TYPE) break;
2391 }
2392 if(s2->next_picture_ptr==NULL){
2393 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2394 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2395 }
2396 /* Skip B-frames if we are in a hurry. */
2397 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2398 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2399 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2400 || avctx->skip_frame >= AVDISCARD_ALL)
2401 break;
2402 /* Skip everything if we are in a hurry>=5. */
2403 if(avctx->hurry_up>=5) break;
2404
2405 if (!s->mpeg_enc_ctx_allocated) break;
2406
2407 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2408 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2409 break;
2410 }
2411
2412 if(!s2->pict_type){
2413 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2414 break;
2415 }
2416
2417 if(s2->first_slice){
2418 s2->first_slice=0;
2419 if(mpeg_field_start(s2, buf, buf_size) < 0)
2420 return -1;
2421 }
2422 if(!s2->current_picture_ptr){
2423 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2424 return -1;
2425 }
2426
2427 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2428 s->slice_count++;
2429 break;
2430 }
2431
2432 if(avctx->thread_count > 1){
2433 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2434 if(threshold <= mb_y){
2435 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2436
2437 thread_context->start_mb_y= mb_y;
2438 thread_context->end_mb_y = s2->mb_height;
2439 if(s->slice_count){
2440 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2441 ff_update_duplicate_context(thread_context, s2);
2442 }
2443 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2444 s->slice_count++;
2445 }
2446 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2447 }else{
2448 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2449 emms_c();
2450
2451 if(ret < 0){
2452 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2453 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);
2454 }else{
2455 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);
2456 }
2457 }
2458 }
2459 break;
2460 }
2461 }
2462 }
2463
2464 static int mpeg_decode_end(AVCodecContext *avctx)
2465 {
2466 Mpeg1Context *s = avctx->priv_data;
2467
2468 if (s->mpeg_enc_ctx_allocated)
2469 MPV_common_end(&s->mpeg_enc_ctx);
2470 return 0;
2471 }
2472
2473 AVCodec mpeg1video_decoder = {
2474 "mpeg1video",
2475 CODEC_TYPE_VIDEO,
2476 CODEC_ID_MPEG1VIDEO,
2477 sizeof(Mpeg1Context),
2478 mpeg_decode_init,
2479 NULL,
2480 mpeg_decode_end,
2481 mpeg_decode_frame,
2482 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2483 .flush= ff_mpeg_flush,
2484 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2485 };
2486
2487 AVCodec mpeg2video_decoder = {
2488 "mpeg2video",
2489 CODEC_TYPE_VIDEO,
2490 CODEC_ID_MPEG2VIDEO,
2491 sizeof(Mpeg1Context),
2492 mpeg_decode_init,
2493 NULL,
2494 mpeg_decode_end,
2495 mpeg_decode_frame,
2496 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2497 .flush= ff_mpeg_flush,
2498 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2499 };
2500
2501 //legacy decoder
2502 AVCodec mpegvideo_decoder = {
2503 "mpegvideo",
2504 CODEC_TYPE_VIDEO,
2505 CODEC_ID_MPEG2VIDEO,
2506 sizeof(Mpeg1Context),
2507 mpeg_decode_init,
2508 NULL,
2509 mpeg_decode_end,
2510 mpeg_decode_frame,
2511 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2512 .flush= ff_mpeg_flush,
2513 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2514 };
2515
2516 #if CONFIG_MPEG_XVMC_DECODER
2517 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2518 if( avctx->thread_count > 1)
2519 return -1;
2520 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2521 return -1;
2522 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2523 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2524 }
2525 mpeg_decode_init(avctx);
2526
2527 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2528 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2529
2530 return 0;
2531 }
2532
2533 AVCodec mpeg_xvmc_decoder = {
2534 "mpegvideo_xvmc",
2535 CODEC_TYPE_VIDEO,
2536 CODEC_ID_MPEG2VIDEO_XVMC,
2537 sizeof(Mpeg1Context),
2538 mpeg_mc_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_HWACCEL | CODEC_CAP_DELAY,
2543 .flush= ff_mpeg_flush,
2544 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2545 };
2546
2547 #endif
2548
2549 #if CONFIG_MPEG_VDPAU_DECODER
2550 AVCodec mpeg_vdpau_decoder = {
2551 "mpegvideo_vdpau",
2552 CODEC_TYPE_VIDEO,
2553 CODEC_ID_MPEG2VIDEO,
2554 sizeof(Mpeg1Context),
2555 mpeg_decode_init,
2556 NULL,
2557 mpeg_decode_end,
2558 mpeg_decode_frame,
2559 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2560 .flush= ff_mpeg_flush,
2561 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2562 };
2563 #endif
2564
2565 #if CONFIG_MPEG1_VDPAU_DECODER
2566 AVCodec mpeg1_vdpau_decoder = {
2567 "mpeg1video_vdpau",
2568 CODEC_TYPE_VIDEO,
2569 CODEC_ID_MPEG1VIDEO,
2570 sizeof(Mpeg1Context),
2571 mpeg_decode_init,
2572 NULL,
2573 mpeg_decode_end,
2574 mpeg_decode_frame,
2575 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2576 .flush= ff_mpeg_flush,
2577 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2578 };
2579 #endif
2580
ffmpeg Lagarith lossless decoder