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flacdec: remove unneeded local variable
[FFMpeg-mirror/lagarith.git] / libavcodec / mpeg12.c
blobb353b88f4c6f52711238644e7b5c8d5affde396f
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;
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 0)
1242 {
1243
1244 if (s1->mpeg_enc_ctx_allocated) {
1245 ParseContext pc= s->parse_context;
1246 s->parse_context.buffer=0;
1247 MPV_common_end(s);
1248 s->parse_context= pc;
1249 }
1250
1251 if( (s->width == 0 )||(s->height == 0))
1252 return -2;
1253
1254 avcodec_set_dimensions(avctx, s->width, s->height);
1255 avctx->bit_rate = s->bit_rate;
1256 s1->save_aspect_info = s->aspect_ratio_info;
1257 s1->save_width = s->width;
1258 s1->save_height = s->height;
1259
1260 /* low_delay may be forced, in this case we will have B-frames
1261 * that behave like P-frames. */
1262 avctx->has_b_frames = !(s->low_delay);
1263
1264 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1265 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1266 //MPEG-1 fps
1267 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1268 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1269 //MPEG-1 aspect
1270 avctx->sample_aspect_ratio= av_d2q(
1271 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1272 avctx->ticks_per_frame=1;
1273 }else{//MPEG-2
1274 //MPEG-2 fps
1275 av_reduce(
1276 &s->avctx->time_base.den,
1277 &s->avctx->time_base.num,
1278 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1279 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1280 1<<30);
1281 avctx->ticks_per_frame=2;
1282 //MPEG-2 aspect
1283 if(s->aspect_ratio_info > 1){
1284 //we ignore the spec here as reality does not match the spec, see for example
1285 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1286 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1287 s->avctx->sample_aspect_ratio=
1288 av_div_q(
1289 ff_mpeg2_aspect[s->aspect_ratio_info],
1290 (AVRational){s->width, s->height}
1291 );
1292 }else{
1293 s->avctx->sample_aspect_ratio=
1294 av_div_q(
1295 ff_mpeg2_aspect[s->aspect_ratio_info],
1296 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1297 );
1298 }
1299 }else{
1300 s->avctx->sample_aspect_ratio=
1301 ff_mpeg2_aspect[s->aspect_ratio_info];
1302 }
1303 }//MPEG-2
1304
1305 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1306 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1307 //until then pix_fmt may be changed right after codec init
1308 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1309 avctx->hwaccel ||
1310 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1311 if( avctx->idct_algo == FF_IDCT_AUTO )
1312 avctx->idct_algo = FF_IDCT_SIMPLE;
1313
1314 /* Quantization matrices may need reordering
1315 * if DCT permutation is changed. */
1316 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1317
1318 if (MPV_common_init(s) < 0)
1319 return -2;
1320
1321 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1322 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1323 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1324 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1325
1326 s1->mpeg_enc_ctx_allocated = 1;
1327 }
1328 return 0;
1329 }
1330
1331 static int mpeg1_decode_picture(AVCodecContext *avctx,
1332 const uint8_t *buf, int buf_size)
1333 {
1334 Mpeg1Context *s1 = avctx->priv_data;
1335 MpegEncContext *s = &s1->mpeg_enc_ctx;
1336 int ref, f_code, vbv_delay;
1337
1338 if(mpeg_decode_postinit(s->avctx) < 0)
1339 return -2;
1340
1341 init_get_bits(&s->gb, buf, buf_size*8);
1342
1343 ref = get_bits(&s->gb, 10); /* temporal ref */
1344 s->pict_type = get_bits(&s->gb, 3);
1345 if(s->pict_type == 0 || s->pict_type > 3)
1346 return -1;
1347
1348 vbv_delay= get_bits(&s->gb, 16);
1349 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1350 s->full_pel[0] = get_bits1(&s->gb);
1351 f_code = get_bits(&s->gb, 3);
1352 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1353 return -1;
1354 s->mpeg_f_code[0][0] = f_code;
1355 s->mpeg_f_code[0][1] = f_code;
1356 }
1357 if (s->pict_type == FF_B_TYPE) {
1358 s->full_pel[1] = get_bits1(&s->gb);
1359 f_code = get_bits(&s->gb, 3);
1360 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1361 return -1;
1362 s->mpeg_f_code[1][0] = f_code;
1363 s->mpeg_f_code[1][1] = f_code;
1364 }
1365 s->current_picture.pict_type= s->pict_type;
1366 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1367
1368 if(avctx->debug & FF_DEBUG_PICT_INFO)
1369 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1370
1371 s->y_dc_scale = 8;
1372 s->c_dc_scale = 8;
1373 s->first_slice = 1;
1374 return 0;
1375 }
1376
1377 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1378 {
1379 MpegEncContext *s= &s1->mpeg_enc_ctx;
1380 int horiz_size_ext, vert_size_ext;
1381 int bit_rate_ext;
1382
1383 skip_bits(&s->gb, 1); /* profile and level esc*/
1384 s->avctx->profile= get_bits(&s->gb, 3);
1385 s->avctx->level= get_bits(&s->gb, 4);
1386 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1387 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1388 horiz_size_ext = get_bits(&s->gb, 2);
1389 vert_size_ext = get_bits(&s->gb, 2);
1390 s->width |= (horiz_size_ext << 12);
1391 s->height |= (vert_size_ext << 12);
1392 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1393 s->bit_rate += (bit_rate_ext << 18) * 400;
1394 skip_bits1(&s->gb); /* marker */
1395 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1396
1397 s->low_delay = get_bits1(&s->gb);
1398 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1399
1400 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1401 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1402
1403 dprintf(s->avctx, "sequence extension\n");
1404 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1405 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1406
1407 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1408 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1409 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1410
1411 }
1412
1413 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1414 {
1415 MpegEncContext *s= &s1->mpeg_enc_ctx;
1416 int color_description, w, h;
1417
1418 skip_bits(&s->gb, 3); /* video format */
1419 color_description= get_bits1(&s->gb);
1420 if(color_description){
1421 skip_bits(&s->gb, 8); /* color primaries */
1422 skip_bits(&s->gb, 8); /* transfer_characteristics */
1423 skip_bits(&s->gb, 8); /* matrix_coefficients */
1424 }
1425 w= get_bits(&s->gb, 14);
1426 skip_bits(&s->gb, 1); //marker
1427 h= get_bits(&s->gb, 14);
1428 skip_bits(&s->gb, 1); //marker
1429
1430 s1->pan_scan.width= 16*w;
1431 s1->pan_scan.height=16*h;
1432
1433 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1434 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1435 }
1436
1437 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1438 {
1439 MpegEncContext *s= &s1->mpeg_enc_ctx;
1440 int i,nofco;
1441
1442 nofco = 1;
1443 if(s->progressive_sequence){
1444 if(s->repeat_first_field){
1445 nofco++;
1446 if(s->top_field_first)
1447 nofco++;
1448 }
1449 }else{
1450 if(s->picture_structure == PICT_FRAME){
1451 nofco++;
1452 if(s->repeat_first_field)
1453 nofco++;
1454 }
1455 }
1456 for(i=0; i<nofco; i++){
1457 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1458 skip_bits(&s->gb, 1); //marker
1459 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1460 skip_bits(&s->gb, 1); //marker
1461 }
1462
1463 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1464 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1465 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1466 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1467 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1468 );
1469 }
1470
1471 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1472 {
1473 int i, v, j;
1474
1475 dprintf(s->avctx, "matrix extension\n");
1476
1477 if (get_bits1(&s->gb)) {
1478 for(i=0;i<64;i++) {
1479 v = get_bits(&s->gb, 8);
1480 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1481 s->intra_matrix[j] = v;
1482 s->chroma_intra_matrix[j] = v;
1483 }
1484 }
1485 if (get_bits1(&s->gb)) {
1486 for(i=0;i<64;i++) {
1487 v = get_bits(&s->gb, 8);
1488 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1489 s->inter_matrix[j] = v;
1490 s->chroma_inter_matrix[j] = v;
1491 }
1492 }
1493 if (get_bits1(&s->gb)) {
1494 for(i=0;i<64;i++) {
1495 v = get_bits(&s->gb, 8);
1496 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1497 s->chroma_intra_matrix[j] = v;
1498 }
1499 }
1500 if (get_bits1(&s->gb)) {
1501 for(i=0;i<64;i++) {
1502 v = get_bits(&s->gb, 8);
1503 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1504 s->chroma_inter_matrix[j] = v;
1505 }
1506 }
1507 }
1508
1509 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1510 {
1511 MpegEncContext *s= &s1->mpeg_enc_ctx;
1512
1513 s->full_pel[0] = s->full_pel[1] = 0;
1514 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1515 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1516 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1517 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1518 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1519 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1520 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1521 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1522 s->pict_type= FF_I_TYPE;
1523 else
1524 s->pict_type= FF_P_TYPE;
1525 }else
1526 s->pict_type= FF_B_TYPE;
1527 s->current_picture.pict_type= s->pict_type;
1528 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1529 s->first_slice= 1;
1530 }
1531 s->intra_dc_precision = get_bits(&s->gb, 2);
1532 s->picture_structure = get_bits(&s->gb, 2);
1533 s->top_field_first = get_bits1(&s->gb);
1534 s->frame_pred_frame_dct = get_bits1(&s->gb);
1535 s->concealment_motion_vectors = get_bits1(&s->gb);
1536 s->q_scale_type = get_bits1(&s->gb);
1537 s->intra_vlc_format = get_bits1(&s->gb);
1538 s->alternate_scan = get_bits1(&s->gb);
1539 s->repeat_first_field = get_bits1(&s->gb);
1540 s->chroma_420_type = get_bits1(&s->gb);
1541 s->progressive_frame = get_bits1(&s->gb);
1542
1543 if(s->picture_structure == PICT_FRAME){
1544 s->first_field=0;
1545 s->v_edge_pos= 16*s->mb_height;
1546 }else{
1547 s->first_field ^= 1;
1548 s->v_edge_pos= 8*s->mb_height;
1549 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1550 }
1551
1552 if(s->alternate_scan){
1553 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1554 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1555 }else{
1556 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1557 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1558 }
1559
1560 /* composite display not parsed */
1561 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1562 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1563 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1564 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1565 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1566 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1567 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1568 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1569 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1570 }
1571
1572 static void mpeg_decode_extension(AVCodecContext *avctx,
1573 const uint8_t *buf, int buf_size)
1574 {
1575 Mpeg1Context *s1 = avctx->priv_data;
1576 MpegEncContext *s = &s1->mpeg_enc_ctx;
1577 int ext_type;
1578
1579 init_get_bits(&s->gb, buf, buf_size*8);
1580
1581 ext_type = get_bits(&s->gb, 4);
1582 switch(ext_type) {
1583 case 0x1:
1584 mpeg_decode_sequence_extension(s1);
1585 break;
1586 case 0x2:
1587 mpeg_decode_sequence_display_extension(s1);
1588 break;
1589 case 0x3:
1590 mpeg_decode_quant_matrix_extension(s);
1591 break;
1592 case 0x7:
1593 mpeg_decode_picture_display_extension(s1);
1594 break;
1595 case 0x8:
1596 mpeg_decode_picture_coding_extension(s1);
1597 break;
1598 }
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->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->repeat_pict = 4;
1626 else
1627 s->current_picture_ptr->repeat_pict = 2;
1628 } else if (s->progressive_frame) {
1629 s->current_picture_ptr->repeat_pict = 1;
1630 }
1631 }
1632
1633 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1634 }else{ //second field
1635 int i;
1636
1637 if(!s->current_picture_ptr){
1638 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1639 return -1;
1640 }
1641
1642 for(i=0; i<4; i++){
1643 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1644 if(s->picture_structure == PICT_BOTTOM_FIELD){
1645 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1646 }
1647 }
1648 }
1649
1650 if (avctx->hwaccel) {
1651 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1652 return -1;
1653 }
1654
1655 // MPV_frame_start will call this function too,
1656 // but we need to call it on every field
1657 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1658 if(ff_xvmc_field_start(s,avctx) < 0)
1659 return -1;
1660
1661 return 0;
1662 }
1663
1664 #define DECODE_SLICE_ERROR -1
1665 #define DECODE_SLICE_OK 0
1666
1667 /**
1668 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1669 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1670 * DECODE_SLICE_OK if this slice is ok<br>
1671 */
1672 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1673 const uint8_t **buf, int buf_size)
1674 {
1675 MpegEncContext *s = &s1->mpeg_enc_ctx;
1676 AVCodecContext *avctx= s->avctx;
1677 const int field_pic= s->picture_structure != PICT_FRAME;
1678 const int lowres= s->avctx->lowres;
1679
1680 s->resync_mb_x=
1681 s->resync_mb_y= -1;
1682
1683 if (mb_y<<field_pic >= s->mb_height){
1684 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1685 return -1;
1686 }
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 (avctx->hwaccel) {
1708 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1709 int start_code = -1;
1710 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1711 if (buf_end < *buf + buf_size)
1712 buf_end -= 4;
1713 s->mb_y = mb_y;
1714 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1715 return DECODE_SLICE_ERROR;
1716 *buf = buf_end;
1717 return DECODE_SLICE_OK;
1718 }
1719
1720 for(;;) {
1721 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1722 if (code < 0){
1723 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1724 return -1;
1725 }
1726 if (code >= 33) {
1727 if (code == 33) {
1728 s->mb_x += 33;
1729 }
1730 /* otherwise, stuffing, nothing to do */
1731 } else {
1732 s->mb_x += code;
1733 break;
1734 }
1735 }
1736 if(s->mb_x >= (unsigned)s->mb_width){
1737 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1738 return -1;
1739 }
1740
1741 s->resync_mb_x= s->mb_x;
1742 s->resync_mb_y= s->mb_y= mb_y;
1743 s->mb_skip_run= 0;
1744 ff_init_block_index(s);
1745
1746 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1747 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1748 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",
1749 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],
1750 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1751 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1752 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1753 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1754 }
1755 }
1756
1757 for(;;) {
1758 //If 1, we memcpy blocks in xvmcvideo.
1759 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1760 ff_xvmc_init_block(s);//set s->block
1761
1762 if(mpeg_decode_mb(s, s->block) < 0)
1763 return -1;
1764
1765 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1766 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1767 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1768 int motion_x, motion_y, dir, i;
1769 if(field_pic && !s->first_field)
1770 xy += wrap/2;
1771
1772 for(i=0; i<2; i++){
1773 for(dir=0; dir<2; dir++){
1774 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1775 motion_x = motion_y = 0;
1776 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1777 motion_x = s->mv[dir][0][0];
1778 motion_y = s->mv[dir][0][1];
1779 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1780 motion_x = s->mv[dir][i][0];
1781 motion_y = s->mv[dir][i][1];
1782 }
1783
1784 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1785 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1786 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1787 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1788 s->current_picture.ref_index [dir][xy ]=
1789 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1790 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1791 }
1792 xy += wrap;
1793 }
1794 }
1795
1796 s->dest[0] += 16 >> lowres;
1797 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1798 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1799
1800 MPV_decode_mb(s, s->block);
1801
1802 if (++s->mb_x >= s->mb_width) {
1803 const int mb_size= 16>>s->avctx->lowres;
1804
1805 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1806
1807 s->mb_x = 0;
1808 s->mb_y++;
1809
1810 if(s->mb_y<<field_pic >= s->mb_height){
1811 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1812 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1813 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1814 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1815
1816 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1817 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1818 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1819 return -1;
1820 }else
1821 goto eos;
1822 }
1823
1824 ff_init_block_index(s);
1825 }
1826
1827 /* skip mb handling */
1828 if (s->mb_skip_run == -1) {
1829 /* read increment again */
1830 s->mb_skip_run = 0;
1831 for(;;) {
1832 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1833 if (code < 0){
1834 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1835 return -1;
1836 }
1837 if (code >= 33) {
1838 if (code == 33) {
1839 s->mb_skip_run += 33;
1840 }else if(code == 35){
1841 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1842 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1843 return -1;
1844 }
1845 goto eos; /* end of slice */
1846 }
1847 /* otherwise, stuffing, nothing to do */
1848 } else {
1849 s->mb_skip_run += code;
1850 break;
1851 }
1852 }
1853 if(s->mb_skip_run){
1854 int i;
1855 if(s->pict_type == FF_I_TYPE){
1856 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1857 return -1;
1858 }
1859
1860 /* skip mb */
1861 s->mb_intra = 0;
1862 for(i=0;i<12;i++)
1863 s->block_last_index[i] = -1;
1864 if(s->picture_structure == PICT_FRAME)
1865 s->mv_type = MV_TYPE_16X16;
1866 else
1867 s->mv_type = MV_TYPE_FIELD;
1868 if (s->pict_type == FF_P_TYPE) {
1869 /* if P type, zero motion vector is implied */
1870 s->mv_dir = MV_DIR_FORWARD;
1871 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1872 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1873 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1874 s->field_select[0][0]= s->picture_structure - 1;
1875 } else {
1876 /* if B type, reuse previous vectors and directions */
1877 s->mv[0][0][0] = s->last_mv[0][0][0];
1878 s->mv[0][0][1] = s->last_mv[0][0][1];
1879 s->mv[1][0][0] = s->last_mv[1][0][0];
1880 s->mv[1][0][1] = s->last_mv[1][0][1];
1881 }
1882 }
1883 }
1884 }
1885 eos: // end of slice
1886 *buf += (get_bits_count(&s->gb)-1)/8;
1887 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1888 return 0;
1889 }
1890
1891 static int slice_decode_thread(AVCodecContext *c, void *arg){
1892 MpegEncContext *s= *(void**)arg;
1893 const uint8_t *buf= s->gb.buffer;
1894 int mb_y= s->start_mb_y;
1895
1896 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1897
1898 for(;;){
1899 uint32_t start_code;
1900 int ret;
1901
1902 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1903 emms_c();
1904 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1905 //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);
1906 if(ret < 0){
1907 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1908 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);
1909 }else{
1910 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);
1911 }
1912
1913 if(s->mb_y == s->end_mb_y)
1914 return 0;
1915
1916 start_code= -1;
1917 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1918 mb_y= start_code - SLICE_MIN_START_CODE;
1919 if(mb_y < 0 || mb_y >= s->end_mb_y)
1920 return -1;
1921 }
1922
1923 return 0; //not reached
1924 }
1925
1926 /**
1927 * Handles slice ends.
1928 * @return 1 if it seems to be the last slice
1929 */
1930 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1931 {
1932 Mpeg1Context *s1 = avctx->priv_data;
1933 MpegEncContext *s = &s1->mpeg_enc_ctx;
1934
1935 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1936 return 0;
1937
1938 if (s->avctx->hwaccel) {
1939 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1940 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1941 }
1942
1943 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1944 ff_xvmc_field_end(s);
1945
1946 /* end of slice reached */
1947 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1948 /* end of image */
1949
1950 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1951
1952 ff_er_frame_end(s);
1953
1954 MPV_frame_end(s);
1955
1956 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1957 *pict= *(AVFrame*)s->current_picture_ptr;
1958 ff_print_debug_info(s, pict);
1959 } else {
1960 s->picture_number++;
1961 /* latency of 1 frame for I- and P-frames */
1962 /* XXX: use another variable than picture_number */
1963 if (s->last_picture_ptr != NULL) {
1964 *pict= *(AVFrame*)s->last_picture_ptr;
1965 ff_print_debug_info(s, pict);
1966 }
1967 }
1968
1969 return 1;
1970 } else {
1971 return 0;
1972 }
1973 }
1974
1975 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1976 const uint8_t *buf, int buf_size)
1977 {
1978 Mpeg1Context *s1 = avctx->priv_data;
1979 MpegEncContext *s = &s1->mpeg_enc_ctx;
1980 int width,height;
1981 int i, v, j;
1982
1983 init_get_bits(&s->gb, buf, buf_size*8);
1984
1985 width = get_bits(&s->gb, 12);
1986 height = get_bits(&s->gb, 12);
1987 if (width <= 0 || height <= 0)
1988 return -1;
1989 s->aspect_ratio_info= get_bits(&s->gb, 4);
1990 if (s->aspect_ratio_info == 0) {
1991 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1992 if (avctx->error_recognition >= FF_ER_COMPLIANT)
1993 return -1;
1994 }
1995 s->frame_rate_index = get_bits(&s->gb, 4);
1996 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1997 return -1;
1998 s->bit_rate = get_bits(&s->gb, 18) * 400;
1999 if (get_bits1(&s->gb) == 0) /* marker */
2000 return -1;
2001 s->width = width;
2002 s->height = height;
2003
2004 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2005 skip_bits(&s->gb, 1);
2006
2007 /* get matrix */
2008 if (get_bits1(&s->gb)) {
2009 for(i=0;i<64;i++) {
2010 v = get_bits(&s->gb, 8);
2011 if(v==0){
2012 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
2013 return -1;
2014 }
2015 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2016 s->intra_matrix[j] = v;
2017 s->chroma_intra_matrix[j] = v;
2018 }
2019 #ifdef DEBUG
2020 dprintf(s->avctx, "intra matrix present\n");
2021 for(i=0;i<64;i++)
2022 dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
2023 dprintf(s->avctx, "\n");
2024 #endif
2025 } else {
2026 for(i=0;i<64;i++) {
2027 j = s->dsp.idct_permutation[i];
2028 v = ff_mpeg1_default_intra_matrix[i];
2029 s->intra_matrix[j] = v;
2030 s->chroma_intra_matrix[j] = v;
2031 }
2032 }
2033 if (get_bits1(&s->gb)) {
2034 for(i=0;i<64;i++) {
2035 v = get_bits(&s->gb, 8);
2036 if(v==0){
2037 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2038 return -1;
2039 }
2040 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2041 s->inter_matrix[j] = v;
2042 s->chroma_inter_matrix[j] = v;
2043 }
2044 #ifdef DEBUG
2045 dprintf(s->avctx, "non-intra matrix present\n");
2046 for(i=0;i<64;i++)
2047 dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2048 dprintf(s->avctx, "\n");
2049 #endif
2050 } else {
2051 for(i=0;i<64;i++) {
2052 int j= s->dsp.idct_permutation[i];
2053 v = ff_mpeg1_default_non_intra_matrix[i];
2054 s->inter_matrix[j] = v;
2055 s->chroma_inter_matrix[j] = v;
2056 }
2057 }
2058
2059 if(show_bits(&s->gb, 23) != 0){
2060 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2061 return -1;
2062 }
2063
2064 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2065 s->progressive_sequence = 1;
2066 s->progressive_frame = 1;
2067 s->picture_structure = PICT_FRAME;
2068 s->frame_pred_frame_dct = 1;
2069 s->chroma_format = 1;
2070 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2071 avctx->sub_id = 1; /* indicates MPEG-1 */
2072 s->out_format = FMT_MPEG1;
2073 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2074 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2075
2076 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2077 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2078 s->avctx->rc_buffer_size, s->bit_rate);
2079
2080 return 0;
2081 }
2082
2083 static int vcr2_init_sequence(AVCodecContext *avctx)
2084 {
2085 Mpeg1Context *s1 = avctx->priv_data;
2086 MpegEncContext *s = &s1->mpeg_enc_ctx;
2087 int i, v;
2088
2089 /* start new MPEG-1 context decoding */
2090 s->out_format = FMT_MPEG1;
2091 if (s1->mpeg_enc_ctx_allocated) {
2092 MPV_common_end(s);
2093 }
2094 s->width = avctx->coded_width;
2095 s->height = avctx->coded_height;
2096 avctx->has_b_frames= 0; //true?
2097 s->low_delay= 1;
2098
2099 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2100 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2101
2102 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2103 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2104 if( avctx->idct_algo == FF_IDCT_AUTO )
2105 avctx->idct_algo = FF_IDCT_SIMPLE;
2106
2107 if (MPV_common_init(s) < 0)
2108 return -1;
2109 exchange_uv(s);//common init reset pblocks, so we swap them here
2110 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2111 s1->mpeg_enc_ctx_allocated = 1;
2112
2113 for(i=0;i<64;i++) {
2114 int j= s->dsp.idct_permutation[i];
2115 v = ff_mpeg1_default_intra_matrix[i];
2116 s->intra_matrix[j] = v;
2117 s->chroma_intra_matrix[j] = v;
2118
2119 v = ff_mpeg1_default_non_intra_matrix[i];
2120 s->inter_matrix[j] = v;
2121 s->chroma_inter_matrix[j] = v;
2122 }
2123
2124 s->progressive_sequence = 1;
2125 s->progressive_frame = 1;
2126 s->picture_structure = PICT_FRAME;
2127 s->frame_pred_frame_dct = 1;
2128 s->chroma_format = 1;
2129 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2130 avctx->sub_id = 2; /* indicates MPEG-2 */
2131 return 0;
2132 }
2133
2134
2135 static void mpeg_decode_user_data(AVCodecContext *avctx,
2136 const uint8_t *buf, int buf_size)
2137 {
2138 const uint8_t *p;
2139 int len, flags;
2140 p = buf;
2141 len = buf_size;
2142
2143 /* we parse the DTG active format information */
2144 if (len >= 5 &&
2145 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2146 flags = p[4];
2147 p += 5;
2148 len -= 5;
2149 if (flags & 0x80) {
2150 /* skip event id */
2151 if (len < 2)
2152 return;
2153 p += 2;
2154 len -= 2;
2155 }
2156 if (flags & 0x40) {
2157 if (len < 1)
2158 return;
2159 avctx->dtg_active_format = p[0] & 0x0f;
2160 }
2161 }
2162 }
2163
2164 static void mpeg_decode_gop(AVCodecContext *avctx,
2165 const uint8_t *buf, int buf_size){
2166 Mpeg1Context *s1 = avctx->priv_data;
2167 MpegEncContext *s = &s1->mpeg_enc_ctx;
2168
2169 int drop_frame_flag;
2170 int time_code_hours, time_code_minutes;
2171 int time_code_seconds, time_code_pictures;
2172 int closed_gop, broken_link;
2173
2174 init_get_bits(&s->gb, buf, buf_size*8);
2175
2176 drop_frame_flag = get_bits1(&s->gb);
2177
2178 time_code_hours=get_bits(&s->gb,5);
2179 time_code_minutes = get_bits(&s->gb,6);
2180 skip_bits1(&s->gb);//marker bit
2181 time_code_seconds = get_bits(&s->gb,6);
2182 time_code_pictures = get_bits(&s->gb,6);
2183
2184 closed_gop = get_bits1(&s->gb);
2185 /*broken_link indicate that after editing the
2186 reference frames of the first B-Frames after GOP I-Frame
2187 are missing (open gop)*/
2188 broken_link = get_bits1(&s->gb);
2189
2190 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2191 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2192 time_code_hours, time_code_minutes, time_code_seconds,
2193 time_code_pictures, closed_gop, broken_link);
2194 }
2195 /**
2196 * Finds the end of the current frame in the bitstream.
2197 * @return the position of the first byte of the next frame, or -1
2198 */
2199 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2200 {
2201 int i;
2202 uint32_t state= pc->state;
2203
2204 /* EOF considered as end of frame */
2205 if (buf_size == 0)
2206 return 0;
2207
2208 /*
2209 0 frame start -> 1/4
2210 1 first_SEQEXT -> 0/2
2211 2 first field start -> 3/0
2212 3 second_SEQEXT -> 2/0
2213 4 searching end
2214 */
2215
2216 for(i=0; i<buf_size; i++){
2217 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2218 if(pc->frame_start_found&1){
2219 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2220 pc->frame_start_found--;
2221 else if(state == EXT_START_CODE+2){
2222 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2223 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2224 }
2225 state++;
2226 }else{
2227 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2228 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2229 i++;
2230 pc->frame_start_found=4;
2231 }
2232 if(state == SEQ_END_CODE){
2233 pc->state=-1;
2234 return i+1;
2235 }
2236 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2237 pc->frame_start_found= 0;
2238 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2239 pc->frame_start_found++;
2240 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2241 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2242 pc->frame_start_found=0;
2243 pc->state=-1;
2244 return i-3;
2245 }
2246 }
2247 if(s && state == PICTURE_START_CODE){
2248 ff_fetch_timestamp(s, i-4, 1);
2249 }
2250 }
2251 }
2252 pc->state= state;
2253 return END_NOT_FOUND;
2254 }
2255
2256 static int decode_chunks(AVCodecContext *avctx,
2257 AVFrame *picture, int *data_size,
2258 const uint8_t *buf, int buf_size);
2259
2260 /* handle buffering and image synchronisation */
2261 static int mpeg_decode_frame(AVCodecContext *avctx,
2262 void *data, int *data_size,
2263 const uint8_t *buf, int buf_size)
2264 {
2265 Mpeg1Context *s = avctx->priv_data;
2266 AVFrame *picture = data;
2267 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2268 dprintf(avctx, "fill_buffer\n");
2269
2270 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2271 /* special case for last picture */
2272 if (s2->low_delay==0 && s2->next_picture_ptr) {
2273 *picture= *(AVFrame*)s2->next_picture_ptr;
2274 s2->next_picture_ptr= NULL;
2275
2276 *data_size = sizeof(AVFrame);
2277 }
2278 return buf_size;
2279 }
2280
2281 if(s2->flags&CODEC_FLAG_TRUNCATED){
2282 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2283
2284 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2285 return buf_size;
2286 }
2287
2288 #if 0
2289 if (s->repeat_field % 2 == 1) {
2290 s->repeat_field++;
2291 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2292 // s2->picture_number, s->repeat_field);
2293 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2294 *data_size = sizeof(AVPicture);
2295 goto the_end;
2296 }
2297 }
2298 #endif
2299
2300 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2301 vcr2_init_sequence(avctx);
2302
2303 s->slice_count= 0;
2304
2305 if(avctx->extradata && !avctx->frame_number)
2306 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2307
2308 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2309 }
2310
2311 static int decode_chunks(AVCodecContext *avctx,
2312 AVFrame *picture, int *data_size,
2313 const uint8_t *buf, int buf_size)
2314 {
2315 Mpeg1Context *s = avctx->priv_data;
2316 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2317 const uint8_t *buf_ptr = buf;
2318 const uint8_t *buf_end = buf + buf_size;
2319 int ret, input_size;
2320
2321 for(;;) {
2322 /* find next start code */
2323 uint32_t start_code = -1;
2324 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2325 if (start_code > 0x1ff){
2326 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2327 if(avctx->thread_count > 1){
2328 int i;
2329
2330 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2331 for(i=0; i<s->slice_count; i++)
2332 s2->error_count += s2->thread_context[i]->error_count;
2333 }
2334
2335 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2336 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2337
2338 if (slice_end(avctx, picture)) {
2339 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2340 *data_size = sizeof(AVPicture);
2341 }
2342 }
2343 s2->pict_type= 0;
2344 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2345 }
2346
2347 input_size = buf_end - buf_ptr;
2348
2349 if(avctx->debug & FF_DEBUG_STARTCODE){
2350 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2351 }
2352
2353 /* prepare data for next start code */
2354 switch(start_code) {
2355 case SEQ_START_CODE:
2356 mpeg1_decode_sequence(avctx, buf_ptr,
2357 input_size);
2358 break;
2359
2360 case PICTURE_START_CODE:
2361 /* we have a complete image: we try to decompress it */
2362 if(mpeg1_decode_picture(avctx,
2363 buf_ptr, input_size) < 0)
2364 s2->pict_type=0;
2365 break;
2366 case EXT_START_CODE:
2367 mpeg_decode_extension(avctx,
2368 buf_ptr, input_size);
2369 break;
2370 case USER_START_CODE:
2371 mpeg_decode_user_data(avctx,
2372 buf_ptr, input_size);
2373 break;
2374 case GOP_START_CODE:
2375 s2->first_field=0;
2376 mpeg_decode_gop(avctx,
2377 buf_ptr, input_size);
2378 break;
2379 default:
2380 if (start_code >= SLICE_MIN_START_CODE &&
2381 start_code <= SLICE_MAX_START_CODE) {
2382 int mb_y= start_code - SLICE_MIN_START_CODE;
2383
2384 if(s2->last_picture_ptr==NULL){
2385 /* Skip B-frames if we do not have reference frames. */
2386 if(s2->pict_type==FF_B_TYPE) break;
2387 }
2388 if(s2->next_picture_ptr==NULL){
2389 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2390 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2391 }
2392 /* Skip B-frames if we are in a hurry. */
2393 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2394 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2395 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2396 || avctx->skip_frame >= AVDISCARD_ALL)
2397 break;
2398 /* Skip everything if we are in a hurry>=5. */
2399 if(avctx->hurry_up>=5) break;
2400
2401 if (!s->mpeg_enc_ctx_allocated) break;
2402
2403 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2404 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2405 break;
2406 }
2407
2408 if(!s2->pict_type){
2409 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2410 break;
2411 }
2412
2413 if(s2->first_slice){
2414 s2->first_slice=0;
2415 if(mpeg_field_start(s2, buf, buf_size) < 0)
2416 return -1;
2417 }
2418 if(!s2->current_picture_ptr){
2419 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2420 return -1;
2421 }
2422
2423 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2424 s->slice_count++;
2425 break;
2426 }
2427
2428 if(avctx->thread_count > 1){
2429 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2430 if(threshold <= mb_y){
2431 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2432
2433 thread_context->start_mb_y= mb_y;
2434 thread_context->end_mb_y = s2->mb_height;
2435 if(s->slice_count){
2436 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2437 ff_update_duplicate_context(thread_context, s2);
2438 }
2439 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2440 s->slice_count++;
2441 }
2442 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2443 }else{
2444 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2445 emms_c();
2446
2447 if(ret < 0){
2448 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2449 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);
2450 }else{
2451 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);
2452 }
2453 }
2454 }
2455 break;
2456 }
2457 }
2458 }
2459
2460 static int mpeg_decode_end(AVCodecContext *avctx)
2461 {
2462 Mpeg1Context *s = avctx->priv_data;
2463
2464 if (s->mpeg_enc_ctx_allocated)
2465 MPV_common_end(&s->mpeg_enc_ctx);
2466 return 0;
2467 }
2468
2469 AVCodec mpeg1video_decoder = {
2470 "mpeg1video",
2471 CODEC_TYPE_VIDEO,
2472 CODEC_ID_MPEG1VIDEO,
2473 sizeof(Mpeg1Context),
2474 mpeg_decode_init,
2475 NULL,
2476 mpeg_decode_end,
2477 mpeg_decode_frame,
2478 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2479 .flush= ff_mpeg_flush,
2480 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2481 };
2482
2483 AVCodec mpeg2video_decoder = {
2484 "mpeg2video",
2485 CODEC_TYPE_VIDEO,
2486 CODEC_ID_MPEG2VIDEO,
2487 sizeof(Mpeg1Context),
2488 mpeg_decode_init,
2489 NULL,
2490 mpeg_decode_end,
2491 mpeg_decode_frame,
2492 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2493 .flush= ff_mpeg_flush,
2494 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2495 };
2496
2497 //legacy decoder
2498 AVCodec mpegvideo_decoder = {
2499 "mpegvideo",
2500 CODEC_TYPE_VIDEO,
2501 CODEC_ID_MPEG2VIDEO,
2502 sizeof(Mpeg1Context),
2503 mpeg_decode_init,
2504 NULL,
2505 mpeg_decode_end,
2506 mpeg_decode_frame,
2507 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2508 .flush= ff_mpeg_flush,
2509 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2510 };
2511
2512 #if CONFIG_MPEG_XVMC_DECODER
2513 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2514 if( avctx->thread_count > 1)
2515 return -1;
2516 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2517 return -1;
2518 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2519 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2520 }
2521 mpeg_decode_init(avctx);
2522
2523 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2524 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2525
2526 return 0;
2527 }
2528
2529 AVCodec mpeg_xvmc_decoder = {
2530 "mpegvideo_xvmc",
2531 CODEC_TYPE_VIDEO,
2532 CODEC_ID_MPEG2VIDEO_XVMC,
2533 sizeof(Mpeg1Context),
2534 mpeg_mc_decode_init,
2535 NULL,
2536 mpeg_decode_end,
2537 mpeg_decode_frame,
2538 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2539 .flush= ff_mpeg_flush,
2540 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2541 };
2542
2543 #endif
2544
2545 #if CONFIG_MPEG_VDPAU_DECODER
2546 AVCodec mpeg_vdpau_decoder = {
2547 "mpegvideo_vdpau",
2548 CODEC_TYPE_VIDEO,
2549 CODEC_ID_MPEG2VIDEO,
2550 sizeof(Mpeg1Context),
2551 mpeg_decode_init,
2552 NULL,
2553 mpeg_decode_end,
2554 mpeg_decode_frame,
2555 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2556 .flush= ff_mpeg_flush,
2557 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2558 };
2559 #endif
2560
2561 #if CONFIG_MPEG1_VDPAU_DECODER
2562 AVCodec mpeg1_vdpau_decoder = {
2563 "mpeg1video_vdpau",
2564 CODEC_TYPE_VIDEO,
2565 CODEC_ID_MPEG1VIDEO,
2566 sizeof(Mpeg1Context),
2567 mpeg_decode_init,
2568 NULL,
2569 mpeg_decode_end,
2570 mpeg_decode_frame,
2571 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2572 .flush= ff_mpeg_flush,
2573 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2574 };
2575 #endif
2576
ffmpeg Lagarith lossless decoder