?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Rename rtp_payload_data_t to avoid clashes with the POSIX namespace
[ffmpeg-lucabe.git] / libavcodec / mpeg12.c
blob3122bb191cf466dc3de56cf59e183212cd451c27
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 mpeg12.c
25 * MPEG-1/2 decoder
26 */
27
28 //#define DEBUG
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "mpegvideo.h"
32
33 #include "mpeg12.h"
34 #include "mpeg12data.h"
35 #include "mpeg12decdata.h"
36 #include "bytestream.h"
37
38 //#undef NDEBUG
39 //#include <assert.h>
40
41
42 #define MV_VLC_BITS 9
43 #define MBINCR_VLC_BITS 9
44 #define MB_PAT_VLC_BITS 9
45 #define MB_PTYPE_VLC_BITS 6
46 #define MB_BTYPE_VLC_BITS 6
47
48 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
49 DCTELEM *block,
50 int n);
51 static inline int mpeg1_decode_block_intra(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 int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx);
67 int XVMC_field_end(MpegEncContext *s);
68 void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
69 void XVMC_init_block(MpegEncContext *s);//set s->block
70
71 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
72 PIX_FMT_XVMC_MPEG2_IDCT,
73 PIX_FMT_XVMC_MPEG2_MC,
74 PIX_FMT_NONE};
75
76 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
77
78
79 #define INIT_2D_VLC_RL(rl, static_size)\
80 {\
81 static RL_VLC_ELEM rl_vlc_table[static_size];\
82 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
83 &rl.table_vlc[0][1], 4, 2,\
84 &rl.table_vlc[0][0], 4, 2, static_size);\
85 \
86 rl.rl_vlc[0]= rl_vlc_table;\
87 init_2d_vlc_rl(&rl);\
88 }
89
90 static void init_2d_vlc_rl(RLTable *rl)
91 {
92 int i;
93
94 for(i=0; i<rl->vlc.table_size; i++){
95 int code= rl->vlc.table[i][0];
96 int len = rl->vlc.table[i][1];
97 int level, run;
98
99 if(len==0){ // illegal code
100 run= 65;
101 level= MAX_LEVEL;
102 }else if(len<0){ //more bits needed
103 run= 0;
104 level= code;
105 }else{
106 if(code==rl->n){ //esc
107 run= 65;
108 level= 0;
109 }else if(code==rl->n+1){ //eob
110 run= 0;
111 level= 127;
112 }else{
113 run= rl->table_run [code] + 1;
114 level= rl->table_level[code];
115 }
116 }
117 rl->rl_vlc[0][i].len= len;
118 rl->rl_vlc[0][i].level= level;
119 rl->rl_vlc[0][i].run= run;
120 }
121 }
122
123 void ff_mpeg12_common_init(MpegEncContext *s)
124 {
125
126 s->y_dc_scale_table=
127 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
128
129 }
130
131 void ff_mpeg1_clean_buffers(MpegEncContext *s){
132 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
133 s->last_dc[1] = s->last_dc[0];
134 s->last_dc[2] = s->last_dc[0];
135 memset(s->last_mv, 0, sizeof(s->last_mv));
136 }
137
138
139 /******************************************/
140 /* decoding */
141
142 static VLC mv_vlc;
143 static VLC mbincr_vlc;
144 static VLC mb_ptype_vlc;
145 static VLC mb_btype_vlc;
146 static VLC mb_pat_vlc;
147
148 av_cold void ff_mpeg12_init_vlcs(void)
149 {
150 static int done = 0;
151
152 if (!done) {
153 done = 1;
154
155 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
156 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
157 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
158 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
159 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
160 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
161 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
162 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
163 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
164 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
165 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
166 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
167 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
168 &ff_mpeg12_mbPatTable[0][1], 2, 1,
169 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
170
171 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
172 &table_mb_ptype[0][1], 2, 1,
173 &table_mb_ptype[0][0], 2, 1, 64);
174 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
175 &table_mb_btype[0][1], 2, 1,
176 &table_mb_btype[0][0], 2, 1, 64);
177 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
178 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
179
180 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
181 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
182 }
183 }
184
185 static inline int get_dmv(MpegEncContext *s)
186 {
187 if(get_bits1(&s->gb))
188 return 1 - (get_bits1(&s->gb) << 1);
189 else
190 return 0;
191 }
192
193 static inline int get_qscale(MpegEncContext *s)
194 {
195 int qscale = get_bits(&s->gb, 5);
196 if (s->q_scale_type) {
197 return non_linear_qscale[qscale];
198 } else {
199 return qscale << 1;
200 }
201 }
202
203 /* motion type (for MPEG-2) */
204 #define MT_FIELD 1
205 #define MT_FRAME 2
206 #define MT_16X8 2
207 #define MT_DMV 3
208
209 static int mpeg_decode_mb(MpegEncContext *s,
210 DCTELEM block[12][64])
211 {
212 int i, j, k, cbp, val, mb_type, motion_type;
213 const int mb_block_count = 4 + (1<< s->chroma_format);
214
215 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
216
217 assert(s->mb_skipped==0);
218
219 if (s->mb_skip_run-- != 0) {
220 if (s->pict_type == FF_P_TYPE) {
221 s->mb_skipped = 1;
222 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
223 } else {
224 int mb_type;
225
226 if(s->mb_x)
227 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
228 else
229 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
230 if(IS_INTRA(mb_type))
231 return -1;
232
233 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
234 mb_type | MB_TYPE_SKIP;
235 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
236
237 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
238 s->mb_skipped = 1;
239 }
240
241 return 0;
242 }
243
244 switch(s->pict_type) {
245 default:
246 case FF_I_TYPE:
247 if (get_bits1(&s->gb) == 0) {
248 if (get_bits1(&s->gb) == 0){
249 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
250 return -1;
251 }
252 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
253 } else {
254 mb_type = MB_TYPE_INTRA;
255 }
256 break;
257 case FF_P_TYPE:
258 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
259 if (mb_type < 0){
260 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
261 return -1;
262 }
263 mb_type = ptype2mb_type[ mb_type ];
264 break;
265 case FF_B_TYPE:
266 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
267 if (mb_type < 0){
268 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
269 return -1;
270 }
271 mb_type = btype2mb_type[ mb_type ];
272 break;
273 }
274 dprintf(s->avctx, "mb_type=%x\n", mb_type);
275 // motion_type = 0; /* avoid warning */
276 if (IS_INTRA(mb_type)) {
277 s->dsp.clear_blocks(s->block[0]);
278
279 if(!s->chroma_y_shift){
280 s->dsp.clear_blocks(s->block[6]);
281 }
282
283 /* compute DCT type */
284 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
285 !s->frame_pred_frame_dct) {
286 s->interlaced_dct = get_bits1(&s->gb);
287 }
288
289 if (IS_QUANT(mb_type))
290 s->qscale = get_qscale(s);
291
292 if (s->concealment_motion_vectors) {
293 /* just parse them */
294 if (s->picture_structure != PICT_FRAME)
295 skip_bits1(&s->gb); /* field select */
296
297 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
298 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
299 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
300 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
301
302 skip_bits1(&s->gb); /* marker */
303 }else
304 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
305 s->mb_intra = 1;
306 #ifdef HAVE_XVMC
307 //if 1, we memcpy blocks in xvmcvideo
308 if(s->avctx->xvmc_acceleration > 1){
309 XVMC_pack_pblocks(s,-1);//inter are always full blocks
310 if(s->swap_uv){
311 exchange_uv(s);
312 }
313 }
314 #endif
315
316 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
317 if(s->flags2 & CODEC_FLAG2_FAST){
318 for(i=0;i<6;i++) {
319 mpeg2_fast_decode_block_intra(s, s->pblocks[i], i);
320 }
321 }else{
322 for(i=0;i<mb_block_count;i++) {
323 if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0)
324 return -1;
325 }
326 }
327 } else {
328 for(i=0;i<6;i++) {
329 if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0)
330 return -1;
331 }
332 }
333 } else {
334 if (mb_type & MB_TYPE_ZERO_MV){
335 assert(mb_type & MB_TYPE_CBP);
336
337 s->mv_dir = MV_DIR_FORWARD;
338 if(s->picture_structure == PICT_FRAME){
339 if(!s->frame_pred_frame_dct)
340 s->interlaced_dct = get_bits1(&s->gb);
341 s->mv_type = MV_TYPE_16X16;
342 }else{
343 s->mv_type = MV_TYPE_FIELD;
344 mb_type |= MB_TYPE_INTERLACED;
345 s->field_select[0][0]= s->picture_structure - 1;
346 }
347
348 if (IS_QUANT(mb_type))
349 s->qscale = get_qscale(s);
350
351 s->last_mv[0][0][0] = 0;
352 s->last_mv[0][0][1] = 0;
353 s->last_mv[0][1][0] = 0;
354 s->last_mv[0][1][1] = 0;
355 s->mv[0][0][0] = 0;
356 s->mv[0][0][1] = 0;
357 }else{
358 assert(mb_type & MB_TYPE_L0L1);
359 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
360 /* get additional motion vector type */
361 if (s->frame_pred_frame_dct)
362 motion_type = MT_FRAME;
363 else{
364 motion_type = get_bits(&s->gb, 2);
365 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
366 s->interlaced_dct = get_bits1(&s->gb);
367 }
368
369 if (IS_QUANT(mb_type))
370 s->qscale = get_qscale(s);
371
372 /* motion vectors */
373 s->mv_dir= (mb_type>>13)&3;
374 dprintf(s->avctx, "motion_type=%d\n", motion_type);
375 switch(motion_type) {
376 case MT_FRAME: /* or MT_16X8 */
377 if (s->picture_structure == PICT_FRAME) {
378 mb_type |= MB_TYPE_16x16;
379 s->mv_type = MV_TYPE_16X16;
380 for(i=0;i<2;i++) {
381 if (USES_LIST(mb_type, i)) {
382 /* MT_FRAME */
383 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
384 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
385 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
386 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
387 /* full_pel: only for MPEG-1 */
388 if (s->full_pel[i]){
389 s->mv[i][0][0] <<= 1;
390 s->mv[i][0][1] <<= 1;
391 }
392 }
393 }
394 } else {
395 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
396 s->mv_type = MV_TYPE_16X8;
397 for(i=0;i<2;i++) {
398 if (USES_LIST(mb_type, i)) {
399 /* MT_16X8 */
400 for(j=0;j<2;j++) {
401 s->field_select[i][j] = get_bits1(&s->gb);
402 for(k=0;k<2;k++) {
403 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
404 s->last_mv[i][j][k]);
405 s->last_mv[i][j][k] = val;
406 s->mv[i][j][k] = val;
407 }
408 }
409 }
410 }
411 }
412 break;
413 case MT_FIELD:
414 s->mv_type = MV_TYPE_FIELD;
415 if (s->picture_structure == PICT_FRAME) {
416 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
417 for(i=0;i<2;i++) {
418 if (USES_LIST(mb_type, i)) {
419 for(j=0;j<2;j++) {
420 s->field_select[i][j] = get_bits1(&s->gb);
421 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
422 s->last_mv[i][j][0]);
423 s->last_mv[i][j][0] = val;
424 s->mv[i][j][0] = val;
425 dprintf(s->avctx, "fmx=%d\n", val);
426 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
427 s->last_mv[i][j][1] >> 1);
428 s->last_mv[i][j][1] = val << 1;
429 s->mv[i][j][1] = val;
430 dprintf(s->avctx, "fmy=%d\n", val);
431 }
432 }
433 }
434 } else {
435 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
436 for(i=0;i<2;i++) {
437 if (USES_LIST(mb_type, i)) {
438 s->field_select[i][0] = get_bits1(&s->gb);
439 for(k=0;k<2;k++) {
440 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
441 s->last_mv[i][0][k]);
442 s->last_mv[i][0][k] = val;
443 s->last_mv[i][1][k] = val;
444 s->mv[i][0][k] = val;
445 }
446 }
447 }
448 }
449 break;
450 case MT_DMV:
451 s->mv_type = MV_TYPE_DMV;
452 for(i=0;i<2;i++) {
453 if (USES_LIST(mb_type, i)) {
454 int dmx, dmy, mx, my, m;
455 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
456 s->last_mv[i][0][0]);
457 s->last_mv[i][0][0] = mx;
458 s->last_mv[i][1][0] = mx;
459 dmx = get_dmv(s);
460 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
461 s->last_mv[i][0][1] >> 1);
462 dmy = get_dmv(s);
463
464
465 s->last_mv[i][0][1] = my<<1;
466 s->last_mv[i][1][1] = my<<1;
467
468 s->mv[i][0][0] = mx;
469 s->mv[i][0][1] = my;
470 s->mv[i][1][0] = mx;//not used
471 s->mv[i][1][1] = my;//not used
472
473 if (s->picture_structure == PICT_FRAME) {
474 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
475
476 //m = 1 + 2 * s->top_field_first;
477 m = s->top_field_first ? 1 : 3;
478
479 /* top -> top pred */
480 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
481 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
482 m = 4 - m;
483 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
484 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
485 } else {
486 mb_type |= MB_TYPE_16x16;
487
488 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
489 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
490 if(s->picture_structure == PICT_TOP_FIELD)
491 s->mv[i][2][1]--;
492 else
493 s->mv[i][2][1]++;
494 }
495 }
496 }
497 break;
498 default:
499 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
500 return -1;
501 }
502 }
503
504 s->mb_intra = 0;
505 if (HAS_CBP(mb_type)) {
506 s->dsp.clear_blocks(s->block[0]);
507
508 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
509 if(mb_block_count > 6){
510 cbp<<= mb_block_count-6;
511 cbp |= get_bits(&s->gb, mb_block_count-6);
512 s->dsp.clear_blocks(s->block[6]);
513 }
514 if (cbp <= 0){
515 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
516 return -1;
517 }
518
519 #ifdef HAVE_XVMC
520 //if 1, we memcpy blocks in xvmcvideo
521 if(s->avctx->xvmc_acceleration > 1){
522 XVMC_pack_pblocks(s,cbp);
523 if(s->swap_uv){
524 exchange_uv(s);
525 }
526 }
527 #endif
528
529 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
530 if(s->flags2 & CODEC_FLAG2_FAST){
531 for(i=0;i<6;i++) {
532 if(cbp & 32) {
533 mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
534 } else {
535 s->block_last_index[i] = -1;
536 }
537 cbp+=cbp;
538 }
539 }else{
540 cbp<<= 12-mb_block_count;
541
542 for(i=0;i<mb_block_count;i++) {
543 if ( cbp & (1<<11) ) {
544 if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0)
545 return -1;
546 } else {
547 s->block_last_index[i] = -1;
548 }
549 cbp+=cbp;
550 }
551 }
552 } else {
553 if(s->flags2 & CODEC_FLAG2_FAST){
554 for(i=0;i<6;i++) {
555 if (cbp & 32) {
556 mpeg1_fast_decode_block_inter(s, s->pblocks[i], i);
557 } else {
558 s->block_last_index[i] = -1;
559 }
560 cbp+=cbp;
561 }
562 }else{
563 for(i=0;i<6;i++) {
564 if (cbp & 32) {
565 if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0)
566 return -1;
567 } else {
568 s->block_last_index[i] = -1;
569 }
570 cbp+=cbp;
571 }
572 }
573 }
574 }else{
575 for(i=0;i<12;i++)
576 s->block_last_index[i] = -1;
577 }
578 }
579
580 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
581
582 return 0;
583 }
584
585 /* as H.263, but only 17 codes */
586 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
587 {
588 int code, sign, val, l, shift;
589
590 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
591 if (code == 0) {
592 return pred;
593 }
594 if (code < 0) {
595 return 0xffff;
596 }
597
598 sign = get_bits1(&s->gb);
599 shift = fcode - 1;
600 val = code;
601 if (shift) {
602 val = (val - 1) << shift;
603 val |= get_bits(&s->gb, shift);
604 val++;
605 }
606 if (sign)
607 val = -val;
608 val += pred;
609
610 /* modulo decoding */
611 l= INT_BIT - 5 - shift;
612 val = (val<<l)>>l;
613 return val;
614 }
615
616 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
617 DCTELEM *block,
618 int n)
619 {
620 int level, dc, diff, i, j, run;
621 int component;
622 RLTable *rl = &ff_rl_mpeg1;
623 uint8_t * const scantable= s->intra_scantable.permutated;
624 const uint16_t *quant_matrix= s->intra_matrix;
625 const int qscale= s->qscale;
626
627 /* DC coefficient */
628 component = (n <= 3 ? 0 : n - 4 + 1);
629 diff = decode_dc(&s->gb, component);
630 if (diff >= 0xffff)
631 return -1;
632 dc = s->last_dc[component];
633 dc += diff;
634 s->last_dc[component] = dc;
635 block[0] = dc<<3;
636 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
637 i = 0;
638 {
639 OPEN_READER(re, &s->gb);
640 /* now quantify & encode AC coefficients */
641 for(;;) {
642 UPDATE_CACHE(re, &s->gb);
643 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
644
645 if(level == 127){
646 break;
647 } else if(level != 0) {
648 i += run;
649 j = scantable[i];
650 level= (level*qscale*quant_matrix[j])>>4;
651 level= (level-1)|1;
652 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
653 LAST_SKIP_BITS(re, &s->gb, 1);
654 } else {
655 /* escape */
656 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
657 UPDATE_CACHE(re, &s->gb);
658 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
659 if (level == -128) {
660 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
661 } else if (level == 0) {
662 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
663 }
664 i += run;
665 j = scantable[i];
666 if(level<0){
667 level= -level;
668 level= (level*qscale*quant_matrix[j])>>4;
669 level= (level-1)|1;
670 level= -level;
671 }else{
672 level= (level*qscale*quant_matrix[j])>>4;
673 level= (level-1)|1;
674 }
675 }
676 if (i > 63){
677 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
678 return -1;
679 }
680
681 block[j] = level;
682 }
683 CLOSE_READER(re, &s->gb);
684 }
685 s->block_last_index[n] = i;
686 return 0;
687 }
688
689 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
690 DCTELEM *block,
691 int n)
692 {
693 int level, i, j, run;
694 RLTable *rl = &ff_rl_mpeg1;
695 uint8_t * const scantable= s->intra_scantable.permutated;
696 const uint16_t *quant_matrix= s->inter_matrix;
697 const int qscale= s->qscale;
698
699 {
700 OPEN_READER(re, &s->gb);
701 i = -1;
702 // special case for first coefficient, no need to add second VLC table
703 UPDATE_CACHE(re, &s->gb);
704 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
705 level= (3*qscale*quant_matrix[0])>>5;
706 level= (level-1)|1;
707 if(GET_CACHE(re, &s->gb)&0x40000000)
708 level= -level;
709 block[0] = level;
710 i++;
711 SKIP_BITS(re, &s->gb, 2);
712 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
713 goto end;
714 }
715 #if MIN_CACHE_BITS < 19
716 UPDATE_CACHE(re, &s->gb);
717 #endif
718 /* now quantify & encode AC coefficients */
719 for(;;) {
720 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
721
722 if(level != 0) {
723 i += run;
724 j = scantable[i];
725 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
726 level= (level-1)|1;
727 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
728 SKIP_BITS(re, &s->gb, 1);
729 } else {
730 /* escape */
731 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
732 UPDATE_CACHE(re, &s->gb);
733 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
734 if (level == -128) {
735 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
736 } else if (level == 0) {
737 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
738 }
739 i += run;
740 j = scantable[i];
741 if(level<0){
742 level= -level;
743 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
744 level= (level-1)|1;
745 level= -level;
746 }else{
747 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
748 level= (level-1)|1;
749 }
750 }
751 if (i > 63){
752 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
753 return -1;
754 }
755
756 block[j] = level;
757 #if MIN_CACHE_BITS < 19
758 UPDATE_CACHE(re, &s->gb);
759 #endif
760 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
761 break;
762 #if MIN_CACHE_BITS >= 19
763 UPDATE_CACHE(re, &s->gb);
764 #endif
765 }
766 end:
767 LAST_SKIP_BITS(re, &s->gb, 2);
768 CLOSE_READER(re, &s->gb);
769 }
770 s->block_last_index[n] = i;
771 return 0;
772 }
773
774 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
775 {
776 int level, i, j, run;
777 RLTable *rl = &ff_rl_mpeg1;
778 uint8_t * const scantable= s->intra_scantable.permutated;
779 const int qscale= s->qscale;
780
781 {
782 OPEN_READER(re, &s->gb);
783 i = -1;
784 // special case for first coefficient, no need to add second VLC table
785 UPDATE_CACHE(re, &s->gb);
786 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
787 level= (3*qscale)>>1;
788 level= (level-1)|1;
789 if(GET_CACHE(re, &s->gb)&0x40000000)
790 level= -level;
791 block[0] = level;
792 i++;
793 SKIP_BITS(re, &s->gb, 2);
794 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
795 goto end;
796 }
797 #if MIN_CACHE_BITS < 19
798 UPDATE_CACHE(re, &s->gb);
799 #endif
800
801 /* now quantify & encode AC coefficients */
802 for(;;) {
803 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
804
805 if(level != 0) {
806 i += run;
807 j = scantable[i];
808 level= ((level*2+1)*qscale)>>1;
809 level= (level-1)|1;
810 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
811 SKIP_BITS(re, &s->gb, 1);
812 } else {
813 /* escape */
814 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
815 UPDATE_CACHE(re, &s->gb);
816 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
817 if (level == -128) {
818 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
819 } else if (level == 0) {
820 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
821 }
822 i += run;
823 j = scantable[i];
824 if(level<0){
825 level= -level;
826 level= ((level*2+1)*qscale)>>1;
827 level= (level-1)|1;
828 level= -level;
829 }else{
830 level= ((level*2+1)*qscale)>>1;
831 level= (level-1)|1;
832 }
833 }
834
835 block[j] = level;
836 #if MIN_CACHE_BITS < 19
837 UPDATE_CACHE(re, &s->gb);
838 #endif
839 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
840 break;
841 #if MIN_CACHE_BITS >= 19
842 UPDATE_CACHE(re, &s->gb);
843 #endif
844 }
845 end:
846 LAST_SKIP_BITS(re, &s->gb, 2);
847 CLOSE_READER(re, &s->gb);
848 }
849 s->block_last_index[n] = i;
850 return 0;
851 }
852
853
854 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
855 DCTELEM *block,
856 int n)
857 {
858 int level, i, j, run;
859 RLTable *rl = &ff_rl_mpeg1;
860 uint8_t * const scantable= s->intra_scantable.permutated;
861 const uint16_t *quant_matrix;
862 const int qscale= s->qscale;
863 int mismatch;
864
865 mismatch = 1;
866
867 {
868 OPEN_READER(re, &s->gb);
869 i = -1;
870 if (n < 4)
871 quant_matrix = s->inter_matrix;
872 else
873 quant_matrix = s->chroma_inter_matrix;
874
875 // special case for first coefficient, no need to add second VLC table
876 UPDATE_CACHE(re, &s->gb);
877 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
878 level= (3*qscale*quant_matrix[0])>>5;
879 if(GET_CACHE(re, &s->gb)&0x40000000)
880 level= -level;
881 block[0] = level;
882 mismatch ^= level;
883 i++;
884 SKIP_BITS(re, &s->gb, 2);
885 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
886 goto end;
887 }
888 #if MIN_CACHE_BITS < 19
889 UPDATE_CACHE(re, &s->gb);
890 #endif
891
892 /* now quantify & encode AC coefficients */
893 for(;;) {
894 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
895
896 if(level != 0) {
897 i += run;
898 j = scantable[i];
899 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
900 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
901 SKIP_BITS(re, &s->gb, 1);
902 } else {
903 /* escape */
904 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
905 UPDATE_CACHE(re, &s->gb);
906 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
907
908 i += run;
909 j = scantable[i];
910 if(level<0){
911 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
912 level= -level;
913 }else{
914 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
915 }
916 }
917 if (i > 63){
918 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
919 return -1;
920 }
921
922 mismatch ^= level;
923 block[j] = level;
924 #if MIN_CACHE_BITS < 19
925 UPDATE_CACHE(re, &s->gb);
926 #endif
927 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
928 break;
929 #if MIN_CACHE_BITS >= 19
930 UPDATE_CACHE(re, &s->gb);
931 #endif
932 }
933 end:
934 LAST_SKIP_BITS(re, &s->gb, 2);
935 CLOSE_READER(re, &s->gb);
936 }
937 block[63] ^= (mismatch & 1);
938
939 s->block_last_index[n] = i;
940 return 0;
941 }
942
943 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
944 DCTELEM *block,
945 int n)
946 {
947 int level, i, j, run;
948 RLTable *rl = &ff_rl_mpeg1;
949 uint8_t * const scantable= s->intra_scantable.permutated;
950 const int qscale= s->qscale;
951 OPEN_READER(re, &s->gb);
952 i = -1;
953
954 // special case for first coefficient, no need to add second VLC table
955 UPDATE_CACHE(re, &s->gb);
956 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
957 level= (3*qscale)>>1;
958 if(GET_CACHE(re, &s->gb)&0x40000000)
959 level= -level;
960 block[0] = level;
961 i++;
962 SKIP_BITS(re, &s->gb, 2);
963 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
964 goto end;
965 }
966 #if MIN_CACHE_BITS < 19
967 UPDATE_CACHE(re, &s->gb);
968 #endif
969
970 /* now quantify & encode AC coefficients */
971 for(;;) {
972 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
973
974 if(level != 0) {
975 i += run;
976 j = scantable[i];
977 level= ((level*2+1)*qscale)>>1;
978 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
979 SKIP_BITS(re, &s->gb, 1);
980 } else {
981 /* escape */
982 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
983 UPDATE_CACHE(re, &s->gb);
984 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
985
986 i += run;
987 j = scantable[i];
988 if(level<0){
989 level= ((-level*2+1)*qscale)>>1;
990 level= -level;
991 }else{
992 level= ((level*2+1)*qscale)>>1;
993 }
994 }
995
996 block[j] = level;
997 #if MIN_CACHE_BITS < 19
998 UPDATE_CACHE(re, &s->gb);
999 #endif
1000 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1001 break;
1002 #if MIN_CACHE_BITS >=19
1003 UPDATE_CACHE(re, &s->gb);
1004 #endif
1005 }
1006 end:
1007 LAST_SKIP_BITS(re, &s->gb, 2);
1008 CLOSE_READER(re, &s->gb);
1009 s->block_last_index[n] = i;
1010 return 0;
1011 }
1012
1013
1014 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1015 DCTELEM *block,
1016 int n)
1017 {
1018 int level, dc, diff, i, j, run;
1019 int component;
1020 RLTable *rl;
1021 uint8_t * const scantable= s->intra_scantable.permutated;
1022 const uint16_t *quant_matrix;
1023 const int qscale= s->qscale;
1024 int mismatch;
1025
1026 /* DC coefficient */
1027 if (n < 4){
1028 quant_matrix = s->intra_matrix;
1029 component = 0;
1030 }else{
1031 quant_matrix = s->chroma_intra_matrix;
1032 component = (n&1) + 1;
1033 }
1034 diff = decode_dc(&s->gb, component);
1035 if (diff >= 0xffff)
1036 return -1;
1037 dc = s->last_dc[component];
1038 dc += diff;
1039 s->last_dc[component] = dc;
1040 block[0] = dc << (3 - s->intra_dc_precision);
1041 dprintf(s->avctx, "dc=%d\n", block[0]);
1042 mismatch = block[0] ^ 1;
1043 i = 0;
1044 if (s->intra_vlc_format)
1045 rl = &ff_rl_mpeg2;
1046 else
1047 rl = &ff_rl_mpeg1;
1048
1049 {
1050 OPEN_READER(re, &s->gb);
1051 /* now quantify & encode AC coefficients */
1052 for(;;) {
1053 UPDATE_CACHE(re, &s->gb);
1054 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1055
1056 if(level == 127){
1057 break;
1058 } else if(level != 0) {
1059 i += run;
1060 j = scantable[i];
1061 level= (level*qscale*quant_matrix[j])>>4;
1062 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1063 LAST_SKIP_BITS(re, &s->gb, 1);
1064 } else {
1065 /* escape */
1066 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1067 UPDATE_CACHE(re, &s->gb);
1068 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1069 i += run;
1070 j = scantable[i];
1071 if(level<0){
1072 level= (-level*qscale*quant_matrix[j])>>4;
1073 level= -level;
1074 }else{
1075 level= (level*qscale*quant_matrix[j])>>4;
1076 }
1077 }
1078 if (i > 63){
1079 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1080 return -1;
1081 }
1082
1083 mismatch^= level;
1084 block[j] = level;
1085 }
1086 CLOSE_READER(re, &s->gb);
1087 }
1088 block[63]^= mismatch&1;
1089
1090 s->block_last_index[n] = i;
1091 return 0;
1092 }
1093
1094 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1095 DCTELEM *block,
1096 int n)
1097 {
1098 int level, dc, diff, j, run;
1099 int component;
1100 RLTable *rl;
1101 uint8_t * scantable= s->intra_scantable.permutated;
1102 const uint16_t *quant_matrix;
1103 const int qscale= s->qscale;
1104
1105 /* DC coefficient */
1106 if (n < 4){
1107 quant_matrix = s->intra_matrix;
1108 component = 0;
1109 }else{
1110 quant_matrix = s->chroma_intra_matrix;
1111 component = (n&1) + 1;
1112 }
1113 diff = decode_dc(&s->gb, component);
1114 if (diff >= 0xffff)
1115 return -1;
1116 dc = s->last_dc[component];
1117 dc += diff;
1118 s->last_dc[component] = dc;
1119 block[0] = dc << (3 - s->intra_dc_precision);
1120 if (s->intra_vlc_format)
1121 rl = &ff_rl_mpeg2;
1122 else
1123 rl = &ff_rl_mpeg1;
1124
1125 {
1126 OPEN_READER(re, &s->gb);
1127 /* now quantify & encode AC coefficients */
1128 for(;;) {
1129 UPDATE_CACHE(re, &s->gb);
1130 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1131
1132 if(level == 127){
1133 break;
1134 } else if(level != 0) {
1135 scantable += run;
1136 j = *scantable;
1137 level= (level*qscale*quant_matrix[j])>>4;
1138 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1139 LAST_SKIP_BITS(re, &s->gb, 1);
1140 } else {
1141 /* escape */
1142 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1143 UPDATE_CACHE(re, &s->gb);
1144 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1145 scantable += run;
1146 j = *scantable;
1147 if(level<0){
1148 level= (-level*qscale*quant_matrix[j])>>4;
1149 level= -level;
1150 }else{
1151 level= (level*qscale*quant_matrix[j])>>4;
1152 }
1153 }
1154
1155 block[j] = level;
1156 }
1157 CLOSE_READER(re, &s->gb);
1158 }
1159
1160 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1161 return 0;
1162 }
1163
1164 typedef struct Mpeg1Context {
1165 MpegEncContext mpeg_enc_ctx;
1166 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1167 int repeat_field; /* true if we must repeat the field */
1168 AVPanScan pan_scan; /** some temporary storage for the panscan */
1169 int slice_count;
1170 int swap_uv;//indicate VCR2
1171 int save_aspect_info;
1172 int save_width, save_height;
1173 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1174
1175 } Mpeg1Context;
1176
1177 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1178 {
1179 Mpeg1Context *s = avctx->priv_data;
1180 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1181 int i;
1182
1183 /* we need some permutation to store matrices,
1184 * until MPV_common_init() sets the real permutation. */
1185 for(i=0;i<64;i++)
1186 s2->dsp.idct_permutation[i]=i;
1187
1188 MPV_decode_defaults(s2);
1189
1190 s->mpeg_enc_ctx.avctx= avctx;
1191 s->mpeg_enc_ctx.flags= avctx->flags;
1192 s->mpeg_enc_ctx.flags2= avctx->flags2;
1193 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1194 ff_mpeg12_init_vlcs();
1195
1196 s->mpeg_enc_ctx_allocated = 0;
1197 s->mpeg_enc_ctx.picture_number = 0;
1198 s->repeat_field = 0;
1199 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1200 return 0;
1201 }
1202
1203 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1204 const uint8_t *new_perm){
1205 uint16_t temp_matrix[64];
1206 int i;
1207
1208 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1209
1210 for(i=0;i<64;i++){
1211 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1212 }
1213 }
1214
1215 /* Call this function when we know all parameters.
1216 * It may be called in different places for MPEG-1 and MPEG-2. */
1217 static int mpeg_decode_postinit(AVCodecContext *avctx){
1218 Mpeg1Context *s1 = avctx->priv_data;
1219 MpegEncContext *s = &s1->mpeg_enc_ctx;
1220 uint8_t old_permutation[64];
1221
1222 if (
1223 (s1->mpeg_enc_ctx_allocated == 0)||
1224 avctx->coded_width != s->width ||
1225 avctx->coded_height != s->height||
1226 s1->save_width != s->width ||
1227 s1->save_height != s->height ||
1228 s1->save_aspect_info != s->aspect_ratio_info||
1229 0)
1230 {
1231
1232 if (s1->mpeg_enc_ctx_allocated) {
1233 ParseContext pc= s->parse_context;
1234 s->parse_context.buffer=0;
1235 MPV_common_end(s);
1236 s->parse_context= pc;
1237 }
1238
1239 if( (s->width == 0 )||(s->height == 0))
1240 return -2;
1241
1242 avcodec_set_dimensions(avctx, s->width, s->height);
1243 avctx->bit_rate = s->bit_rate;
1244 s1->save_aspect_info = s->aspect_ratio_info;
1245 s1->save_width = s->width;
1246 s1->save_height = s->height;
1247
1248 /* low_delay may be forced, in this case we will have B-frames
1249 * that behave like P-frames. */
1250 avctx->has_b_frames = !(s->low_delay);
1251
1252 if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID
1253 //MPEG-1 fps
1254 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1255 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1256 //MPEG-1 aspect
1257 avctx->sample_aspect_ratio= av_d2q(
1258 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1259
1260 }else{//MPEG-2
1261 //MPEG-2 fps
1262 av_reduce(
1263 &s->avctx->time_base.den,
1264 &s->avctx->time_base.num,
1265 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1266 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1267 1<<30);
1268 //MPEG-2 aspect
1269 if(s->aspect_ratio_info > 1){
1270 //we ignore the spec here as reality does not match the spec, see for example
1271 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1272 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1273 s->avctx->sample_aspect_ratio=
1274 av_div_q(
1275 ff_mpeg2_aspect[s->aspect_ratio_info],
1276 (AVRational){s->width, s->height}
1277 );
1278 }else{
1279 s->avctx->sample_aspect_ratio=
1280 av_div_q(
1281 ff_mpeg2_aspect[s->aspect_ratio_info],
1282 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1283 );
1284 }
1285 }else{
1286 s->avctx->sample_aspect_ratio=
1287 ff_mpeg2_aspect[s->aspect_ratio_info];
1288 }
1289 }//MPEG-2
1290
1291 if(avctx->xvmc_acceleration){
1292 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1293 }else{
1294 if(s->chroma_format < 2){
1295 avctx->pix_fmt = PIX_FMT_YUV420P;
1296 }else
1297 if(s->chroma_format == 2){
1298 avctx->pix_fmt = PIX_FMT_YUV422P;
1299 }else
1300 if(s->chroma_format > 2){
1301 avctx->pix_fmt = PIX_FMT_YUV444P;
1302 }
1303 }
1304 //until then pix_fmt may be changed right after codec init
1305 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
1306 if( avctx->idct_algo == FF_IDCT_AUTO )
1307 avctx->idct_algo = FF_IDCT_SIMPLE;
1308
1309 /* Quantization matrices may need reordering
1310 * if DCT permutation is changed. */
1311 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1312
1313 if (MPV_common_init(s) < 0)
1314 return -2;
1315
1316 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1317 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1318 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1319 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1320
1321 s1->mpeg_enc_ctx_allocated = 1;
1322 }
1323 return 0;
1324 }
1325
1326 static int mpeg1_decode_picture(AVCodecContext *avctx,
1327 const uint8_t *buf, int buf_size)
1328 {
1329 Mpeg1Context *s1 = avctx->priv_data;
1330 MpegEncContext *s = &s1->mpeg_enc_ctx;
1331 int ref, f_code, vbv_delay;
1332
1333 if(mpeg_decode_postinit(s->avctx) < 0)
1334 return -2;
1335
1336 init_get_bits(&s->gb, buf, buf_size*8);
1337
1338 ref = get_bits(&s->gb, 10); /* temporal ref */
1339 s->pict_type = get_bits(&s->gb, 3);
1340 if(s->pict_type == 0 || s->pict_type > 3)
1341 return -1;
1342
1343 vbv_delay= get_bits(&s->gb, 16);
1344 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1345 s->full_pel[0] = get_bits1(&s->gb);
1346 f_code = get_bits(&s->gb, 3);
1347 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1348 return -1;
1349 s->mpeg_f_code[0][0] = f_code;
1350 s->mpeg_f_code[0][1] = f_code;
1351 }
1352 if (s->pict_type == FF_B_TYPE) {
1353 s->full_pel[1] = get_bits1(&s->gb);
1354 f_code = get_bits(&s->gb, 3);
1355 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1356 return -1;
1357 s->mpeg_f_code[1][0] = f_code;
1358 s->mpeg_f_code[1][1] = f_code;
1359 }
1360 s->current_picture.pict_type= s->pict_type;
1361 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1362
1363 if(avctx->debug & FF_DEBUG_PICT_INFO)
1364 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1365
1366 s->y_dc_scale = 8;
1367 s->c_dc_scale = 8;
1368 s->first_slice = 1;
1369 return 0;
1370 }
1371
1372 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1373 {
1374 MpegEncContext *s= &s1->mpeg_enc_ctx;
1375 int horiz_size_ext, vert_size_ext;
1376 int bit_rate_ext;
1377
1378 skip_bits(&s->gb, 1); /* profile and level esc*/
1379 s->avctx->profile= get_bits(&s->gb, 3);
1380 s->avctx->level= get_bits(&s->gb, 4);
1381 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1382 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1383 horiz_size_ext = get_bits(&s->gb, 2);
1384 vert_size_ext = get_bits(&s->gb, 2);
1385 s->width |= (horiz_size_ext << 12);
1386 s->height |= (vert_size_ext << 12);
1387 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1388 s->bit_rate += (bit_rate_ext << 18) * 400;
1389 skip_bits1(&s->gb); /* marker */
1390 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1391
1392 s->low_delay = get_bits1(&s->gb);
1393 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1394
1395 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1396 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1397
1398 dprintf(s->avctx, "sequence extension\n");
1399 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1400 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1401
1402 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1403 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1404 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1405
1406 }
1407
1408 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1409 {
1410 MpegEncContext *s= &s1->mpeg_enc_ctx;
1411 int color_description, w, h;
1412
1413 skip_bits(&s->gb, 3); /* video format */
1414 color_description= get_bits1(&s->gb);
1415 if(color_description){
1416 skip_bits(&s->gb, 8); /* color primaries */
1417 skip_bits(&s->gb, 8); /* transfer_characteristics */
1418 skip_bits(&s->gb, 8); /* matrix_coefficients */
1419 }
1420 w= get_bits(&s->gb, 14);
1421 skip_bits(&s->gb, 1); //marker
1422 h= get_bits(&s->gb, 14);
1423 skip_bits(&s->gb, 1); //marker
1424
1425 s1->pan_scan.width= 16*w;
1426 s1->pan_scan.height=16*h;
1427
1428 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1429 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1430 }
1431
1432 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1433 {
1434 MpegEncContext *s= &s1->mpeg_enc_ctx;
1435 int i,nofco;
1436
1437 nofco = 1;
1438 if(s->progressive_sequence){
1439 if(s->repeat_first_field){
1440 nofco++;
1441 if(s->top_field_first)
1442 nofco++;
1443 }
1444 }else{
1445 if(s->picture_structure == PICT_FRAME){
1446 nofco++;
1447 if(s->repeat_first_field)
1448 nofco++;
1449 }
1450 }
1451 for(i=0; i<nofco; i++){
1452 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1453 skip_bits(&s->gb, 1); //marker
1454 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1455 skip_bits(&s->gb, 1); //marker
1456 }
1457
1458 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1459 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1460 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1461 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1462 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1463 );
1464 }
1465
1466 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1467 {
1468 int i, v, j;
1469
1470 dprintf(s->avctx, "matrix extension\n");
1471
1472 if (get_bits1(&s->gb)) {
1473 for(i=0;i<64;i++) {
1474 v = get_bits(&s->gb, 8);
1475 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1476 s->intra_matrix[j] = v;
1477 s->chroma_intra_matrix[j] = v;
1478 }
1479 }
1480 if (get_bits1(&s->gb)) {
1481 for(i=0;i<64;i++) {
1482 v = get_bits(&s->gb, 8);
1483 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1484 s->inter_matrix[j] = v;
1485 s->chroma_inter_matrix[j] = v;
1486 }
1487 }
1488 if (get_bits1(&s->gb)) {
1489 for(i=0;i<64;i++) {
1490 v = get_bits(&s->gb, 8);
1491 j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1492 s->chroma_intra_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_inter_matrix[j] = v;
1500 }
1501 }
1502 }
1503
1504 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1505 {
1506 MpegEncContext *s= &s1->mpeg_enc_ctx;
1507
1508 s->full_pel[0] = s->full_pel[1] = 0;
1509 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1510 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1511 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1512 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1513 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1514 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1515 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1516 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1517 s->pict_type= FF_I_TYPE;
1518 else
1519 s->pict_type= FF_P_TYPE;
1520 }else
1521 s->pict_type= FF_B_TYPE;
1522 s->current_picture.pict_type= s->pict_type;
1523 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1524 s->first_slice= 1;
1525 }
1526 s->intra_dc_precision = get_bits(&s->gb, 2);
1527 s->picture_structure = get_bits(&s->gb, 2);
1528 s->top_field_first = get_bits1(&s->gb);
1529 s->frame_pred_frame_dct = get_bits1(&s->gb);
1530 s->concealment_motion_vectors = get_bits1(&s->gb);
1531 s->q_scale_type = get_bits1(&s->gb);
1532 s->intra_vlc_format = get_bits1(&s->gb);
1533 s->alternate_scan = get_bits1(&s->gb);
1534 s->repeat_first_field = get_bits1(&s->gb);
1535 s->chroma_420_type = get_bits1(&s->gb);
1536 s->progressive_frame = get_bits1(&s->gb);
1537
1538 if(s->picture_structure == PICT_FRAME){
1539 s->first_field=0;
1540 s->v_edge_pos= 16*s->mb_height;
1541 }else{
1542 s->first_field ^= 1;
1543 s->v_edge_pos= 8*s->mb_height;
1544 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1545 }
1546
1547 if(s->alternate_scan){
1548 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1549 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1550 }else{
1551 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1552 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1553 }
1554
1555 /* composite display not parsed */
1556 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1557 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1558 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1559 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1560 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1561 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1562 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1563 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1564 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1565 }
1566
1567 static void mpeg_decode_extension(AVCodecContext *avctx,
1568 const uint8_t *buf, int buf_size)
1569 {
1570 Mpeg1Context *s1 = avctx->priv_data;
1571 MpegEncContext *s = &s1->mpeg_enc_ctx;
1572 int ext_type;
1573
1574 init_get_bits(&s->gb, buf, buf_size*8);
1575
1576 ext_type = get_bits(&s->gb, 4);
1577 switch(ext_type) {
1578 case 0x1:
1579 mpeg_decode_sequence_extension(s1);
1580 break;
1581 case 0x2:
1582 mpeg_decode_sequence_display_extension(s1);
1583 break;
1584 case 0x3:
1585 mpeg_decode_quant_matrix_extension(s);
1586 break;
1587 case 0x7:
1588 mpeg_decode_picture_display_extension(s1);
1589 break;
1590 case 0x8:
1591 mpeg_decode_picture_coding_extension(s1);
1592 break;
1593 }
1594 }
1595
1596 static void exchange_uv(MpegEncContext *s){
1597 short * tmp = s->pblocks[4];
1598 s->pblocks[4] = s->pblocks[5];
1599 s->pblocks[5] = tmp;
1600 }
1601
1602 static int mpeg_field_start(MpegEncContext *s){
1603 AVCodecContext *avctx= s->avctx;
1604 Mpeg1Context *s1 = (Mpeg1Context*)s;
1605
1606 /* start frame decoding */
1607 if(s->first_field || s->picture_structure==PICT_FRAME){
1608 if(MPV_frame_start(s, avctx) < 0)
1609 return -1;
1610
1611 ff_er_frame_start(s);
1612
1613 /* first check if we must repeat the frame */
1614 s->current_picture_ptr->repeat_pict = 0;
1615 if (s->repeat_first_field) {
1616 if (s->progressive_sequence) {
1617 if (s->top_field_first)
1618 s->current_picture_ptr->repeat_pict = 4;
1619 else
1620 s->current_picture_ptr->repeat_pict = 2;
1621 } else if (s->progressive_frame) {
1622 s->current_picture_ptr->repeat_pict = 1;
1623 }
1624 }
1625
1626 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1627 }else{ //second field
1628 int i;
1629
1630 if(!s->current_picture_ptr){
1631 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1632 return -1;
1633 }
1634
1635 for(i=0; i<4; i++){
1636 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1637 if(s->picture_structure == PICT_BOTTOM_FIELD){
1638 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1639 }
1640 }
1641 }
1642 #ifdef HAVE_XVMC
1643 // MPV_frame_start will call this function too,
1644 // but we need to call it on every field
1645 if(s->avctx->xvmc_acceleration)
1646 XVMC_field_start(s,avctx);
1647 #endif
1648
1649 return 0;
1650 }
1651
1652 #define DECODE_SLICE_ERROR -1
1653 #define DECODE_SLICE_OK 0
1654
1655 /**
1656 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1657 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1658 * DECODE_SLICE_OK if this slice is ok<br>
1659 */
1660 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1661 const uint8_t **buf, int buf_size)
1662 {
1663 MpegEncContext *s = &s1->mpeg_enc_ctx;
1664 AVCodecContext *avctx= s->avctx;
1665 const int field_pic= s->picture_structure != PICT_FRAME;
1666 const int lowres= s->avctx->lowres;
1667
1668 s->resync_mb_x=
1669 s->resync_mb_y= -1;
1670
1671 if (mb_y<<field_pic >= s->mb_height){
1672 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1673 return -1;
1674 }
1675
1676 init_get_bits(&s->gb, *buf, buf_size*8);
1677
1678 ff_mpeg1_clean_buffers(s);
1679 s->interlaced_dct = 0;
1680
1681 s->qscale = get_qscale(s);
1682
1683 if(s->qscale == 0){
1684 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1685 return -1;
1686 }
1687
1688 /* extra slice info */
1689 while (get_bits1(&s->gb) != 0) {
1690 skip_bits(&s->gb, 8);
1691 }
1692
1693 s->mb_x=0;
1694
1695 for(;;) {
1696 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1697 if (code < 0){
1698 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1699 return -1;
1700 }
1701 if (code >= 33) {
1702 if (code == 33) {
1703 s->mb_x += 33;
1704 }
1705 /* otherwise, stuffing, nothing to do */
1706 } else {
1707 s->mb_x += code;
1708 break;
1709 }
1710 }
1711 if(s->mb_x >= (unsigned)s->mb_width){
1712 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1713 return -1;
1714 }
1715
1716 s->resync_mb_x= s->mb_x;
1717 s->resync_mb_y= s->mb_y= mb_y;
1718 s->mb_skip_run= 0;
1719 ff_init_block_index(s);
1720
1721 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1722 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1723 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",
1724 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],
1725 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1726 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1727 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1728 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1729 }
1730 }
1731
1732 for(;;) {
1733 #ifdef HAVE_XVMC
1734 //If 1, we memcpy blocks in xvmcvideo.
1735 if(s->avctx->xvmc_acceleration > 1)
1736 XVMC_init_block(s);//set s->block
1737 #endif
1738
1739 if(mpeg_decode_mb(s, s->block) < 0)
1740 return -1;
1741
1742 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1743 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1744 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1745 int motion_x, motion_y, dir, i;
1746 if(field_pic && !s->first_field)
1747 xy += wrap/2;
1748
1749 for(i=0; i<2; i++){
1750 for(dir=0; dir<2; dir++){
1751 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1752 motion_x = motion_y = 0;
1753 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1754 motion_x = s->mv[dir][0][0];
1755 motion_y = s->mv[dir][0][1];
1756 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1757 motion_x = s->mv[dir][i][0];
1758 motion_y = s->mv[dir][i][1];
1759 }
1760
1761 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1762 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1763 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1764 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1765 s->current_picture.ref_index [dir][xy ]=
1766 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1767 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1768 }
1769 xy += wrap;
1770 }
1771 }
1772
1773 s->dest[0] += 16 >> lowres;
1774 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1775 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1776
1777 MPV_decode_mb(s, s->block);
1778
1779 if (++s->mb_x >= s->mb_width) {
1780 const int mb_size= 16>>s->avctx->lowres;
1781
1782 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1783
1784 s->mb_x = 0;
1785 s->mb_y++;
1786
1787 if(s->mb_y<<field_pic >= s->mb_height){
1788 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1789 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1790 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1791 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1792
1793 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1794 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1795 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1796 return -1;
1797 }else
1798 goto eos;
1799 }
1800
1801 ff_init_block_index(s);
1802 }
1803
1804 /* skip mb handling */
1805 if (s->mb_skip_run == -1) {
1806 /* read increment again */
1807 s->mb_skip_run = 0;
1808 for(;;) {
1809 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1810 if (code < 0){
1811 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1812 return -1;
1813 }
1814 if (code >= 33) {
1815 if (code == 33) {
1816 s->mb_skip_run += 33;
1817 }else if(code == 35){
1818 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1819 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1820 return -1;
1821 }
1822 goto eos; /* end of slice */
1823 }
1824 /* otherwise, stuffing, nothing to do */
1825 } else {
1826 s->mb_skip_run += code;
1827 break;
1828 }
1829 }
1830 if(s->mb_skip_run){
1831 int i;
1832 if(s->pict_type == FF_I_TYPE){
1833 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1834 return -1;
1835 }
1836
1837 /* skip mb */
1838 s->mb_intra = 0;
1839 for(i=0;i<12;i++)
1840 s->block_last_index[i] = -1;
1841 if(s->picture_structure == PICT_FRAME)
1842 s->mv_type = MV_TYPE_16X16;
1843 else
1844 s->mv_type = MV_TYPE_FIELD;
1845 if (s->pict_type == FF_P_TYPE) {
1846 /* if P type, zero motion vector is implied */
1847 s->mv_dir = MV_DIR_FORWARD;
1848 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1849 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1850 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1851 s->field_select[0][0]= s->picture_structure - 1;
1852 } else {
1853 /* if B type, reuse previous vectors and directions */
1854 s->mv[0][0][0] = s->last_mv[0][0][0];
1855 s->mv[0][0][1] = s->last_mv[0][0][1];
1856 s->mv[1][0][0] = s->last_mv[1][0][0];
1857 s->mv[1][0][1] = s->last_mv[1][0][1];
1858 }
1859 }
1860 }
1861 }
1862 eos: // end of slice
1863 *buf += (get_bits_count(&s->gb)-1)/8;
1864 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1865 return 0;
1866 }
1867
1868 static int slice_decode_thread(AVCodecContext *c, void *arg){
1869 MpegEncContext *s= *(void**)arg;
1870 const uint8_t *buf= s->gb.buffer;
1871 int mb_y= s->start_mb_y;
1872
1873 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1874
1875 for(;;){
1876 uint32_t start_code;
1877 int ret;
1878
1879 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1880 emms_c();
1881 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1882 //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);
1883 if(ret < 0){
1884 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1885 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);
1886 }else{
1887 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);
1888 }
1889
1890 if(s->mb_y == s->end_mb_y)
1891 return 0;
1892
1893 start_code= -1;
1894 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1895 mb_y= start_code - SLICE_MIN_START_CODE;
1896 if(mb_y < 0 || mb_y >= s->end_mb_y)
1897 return -1;
1898 }
1899
1900 return 0; //not reached
1901 }
1902
1903 /**
1904 * Handles slice ends.
1905 * @return 1 if it seems to be the last slice
1906 */
1907 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1908 {
1909 Mpeg1Context *s1 = avctx->priv_data;
1910 MpegEncContext *s = &s1->mpeg_enc_ctx;
1911
1912 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1913 return 0;
1914
1915 #ifdef HAVE_XVMC
1916 if(s->avctx->xvmc_acceleration)
1917 XVMC_field_end(s);
1918 #endif
1919 /* end of slice reached */
1920 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1921 /* end of image */
1922
1923 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1924
1925 ff_er_frame_end(s);
1926
1927 MPV_frame_end(s);
1928
1929 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1930 *pict= *(AVFrame*)s->current_picture_ptr;
1931 ff_print_debug_info(s, pict);
1932 } else {
1933 s->picture_number++;
1934 /* latency of 1 frame for I- and P-frames */
1935 /* XXX: use another variable than picture_number */
1936 if (s->last_picture_ptr != NULL) {
1937 *pict= *(AVFrame*)s->last_picture_ptr;
1938 ff_print_debug_info(s, pict);
1939 }
1940 }
1941
1942 return 1;
1943 } else {
1944 return 0;
1945 }
1946 }
1947
1948 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1949 const uint8_t *buf, int buf_size)
1950 {
1951 Mpeg1Context *s1 = avctx->priv_data;
1952 MpegEncContext *s = &s1->mpeg_enc_ctx;
1953 int width,height;
1954 int i, v, j;
1955
1956 init_get_bits(&s->gb, buf, buf_size*8);
1957
1958 width = get_bits(&s->gb, 12);
1959 height = get_bits(&s->gb, 12);
1960 if (width <= 0 || height <= 0)
1961 return -1;
1962 s->aspect_ratio_info= get_bits(&s->gb, 4);
1963 if (s->aspect_ratio_info == 0) {
1964 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1965 if (avctx->error_recognition >= FF_ER_COMPLIANT)
1966 return -1;
1967 }
1968 s->frame_rate_index = get_bits(&s->gb, 4);
1969 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1970 return -1;
1971 s->bit_rate = get_bits(&s->gb, 18) * 400;
1972 if (get_bits1(&s->gb) == 0) /* marker */
1973 return -1;
1974 s->width = width;
1975 s->height = height;
1976
1977 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
1978 skip_bits(&s->gb, 1);
1979
1980 /* get matrix */
1981 if (get_bits1(&s->gb)) {
1982 for(i=0;i<64;i++) {
1983 v = get_bits(&s->gb, 8);
1984 if(v==0){
1985 av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
1986 return -1;
1987 }
1988 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1989 s->intra_matrix[j] = v;
1990 s->chroma_intra_matrix[j] = v;
1991 }
1992 #ifdef DEBUG
1993 dprintf(s->avctx, "intra matrix present\n");
1994 for(i=0;i<64;i++)
1995 dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
1996 dprintf(s->avctx, "\n");
1997 #endif
1998 } else {
1999 for(i=0;i<64;i++) {
2000 j = s->dsp.idct_permutation[i];
2001 v = ff_mpeg1_default_intra_matrix[i];
2002 s->intra_matrix[j] = v;
2003 s->chroma_intra_matrix[j] = v;
2004 }
2005 }
2006 if (get_bits1(&s->gb)) {
2007 for(i=0;i<64;i++) {
2008 v = get_bits(&s->gb, 8);
2009 if(v==0){
2010 av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
2011 return -1;
2012 }
2013 j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
2014 s->inter_matrix[j] = v;
2015 s->chroma_inter_matrix[j] = v;
2016 }
2017 #ifdef DEBUG
2018 dprintf(s->avctx, "non-intra matrix present\n");
2019 for(i=0;i<64;i++)
2020 dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
2021 dprintf(s->avctx, "\n");
2022 #endif
2023 } else {
2024 for(i=0;i<64;i++) {
2025 int j= s->dsp.idct_permutation[i];
2026 v = ff_mpeg1_default_non_intra_matrix[i];
2027 s->inter_matrix[j] = v;
2028 s->chroma_inter_matrix[j] = v;
2029 }
2030 }
2031
2032 if(show_bits(&s->gb, 23) != 0){
2033 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2034 return -1;
2035 }
2036
2037 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2038 s->progressive_sequence = 1;
2039 s->progressive_frame = 1;
2040 s->picture_structure = PICT_FRAME;
2041 s->frame_pred_frame_dct = 1;
2042 s->chroma_format = 1;
2043 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2044 avctx->sub_id = 1; /* indicates MPEG-1 */
2045 s->out_format = FMT_MPEG1;
2046 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2047 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2048
2049 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2050 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2051 s->avctx->rc_buffer_size, s->bit_rate);
2052
2053 return 0;
2054 }
2055
2056 static int vcr2_init_sequence(AVCodecContext *avctx)
2057 {
2058 Mpeg1Context *s1 = avctx->priv_data;
2059 MpegEncContext *s = &s1->mpeg_enc_ctx;
2060 int i, v;
2061
2062 /* start new MPEG-1 context decoding */
2063 s->out_format = FMT_MPEG1;
2064 if (s1->mpeg_enc_ctx_allocated) {
2065 MPV_common_end(s);
2066 }
2067 s->width = avctx->coded_width;
2068 s->height = avctx->coded_height;
2069 avctx->has_b_frames= 0; //true?
2070 s->low_delay= 1;
2071
2072 if(avctx->xvmc_acceleration){
2073 avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
2074 }else{
2075 avctx->pix_fmt = PIX_FMT_YUV420P;
2076 }
2077
2078 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT )
2079 if( avctx->idct_algo == FF_IDCT_AUTO )
2080 avctx->idct_algo = FF_IDCT_SIMPLE;
2081
2082 if (MPV_common_init(s) < 0)
2083 return -1;
2084 exchange_uv(s);//common init reset pblocks, so we swap them here
2085 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2086 s1->mpeg_enc_ctx_allocated = 1;
2087
2088 for(i=0;i<64;i++) {
2089 int j= s->dsp.idct_permutation[i];
2090 v = ff_mpeg1_default_intra_matrix[i];
2091 s->intra_matrix[j] = v;
2092 s->chroma_intra_matrix[j] = v;
2093
2094 v = ff_mpeg1_default_non_intra_matrix[i];
2095 s->inter_matrix[j] = v;
2096 s->chroma_inter_matrix[j] = v;
2097 }
2098
2099 s->progressive_sequence = 1;
2100 s->progressive_frame = 1;
2101 s->picture_structure = PICT_FRAME;
2102 s->frame_pred_frame_dct = 1;
2103 s->chroma_format = 1;
2104 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2105 avctx->sub_id = 2; /* indicates MPEG-2 */
2106 return 0;
2107 }
2108
2109
2110 static void mpeg_decode_user_data(AVCodecContext *avctx,
2111 const uint8_t *buf, int buf_size)
2112 {
2113 const uint8_t *p;
2114 int len, flags;
2115 p = buf;
2116 len = buf_size;
2117
2118 /* we parse the DTG active format information */
2119 if (len >= 5 &&
2120 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2121 flags = p[4];
2122 p += 5;
2123 len -= 5;
2124 if (flags & 0x80) {
2125 /* skip event id */
2126 if (len < 2)
2127 return;
2128 p += 2;
2129 len -= 2;
2130 }
2131 if (flags & 0x40) {
2132 if (len < 1)
2133 return;
2134 avctx->dtg_active_format = p[0] & 0x0f;
2135 }
2136 }
2137 }
2138
2139 static void mpeg_decode_gop(AVCodecContext *avctx,
2140 const uint8_t *buf, int buf_size){
2141 Mpeg1Context *s1 = avctx->priv_data;
2142 MpegEncContext *s = &s1->mpeg_enc_ctx;
2143
2144 int drop_frame_flag;
2145 int time_code_hours, time_code_minutes;
2146 int time_code_seconds, time_code_pictures;
2147 int closed_gop, broken_link;
2148
2149 init_get_bits(&s->gb, buf, buf_size*8);
2150
2151 drop_frame_flag = get_bits1(&s->gb);
2152
2153 time_code_hours=get_bits(&s->gb,5);
2154 time_code_minutes = get_bits(&s->gb,6);
2155 skip_bits1(&s->gb);//marker bit
2156 time_code_seconds = get_bits(&s->gb,6);
2157 time_code_pictures = get_bits(&s->gb,6);
2158
2159 closed_gop = get_bits1(&s->gb);
2160 /*broken_link indicate that after editing the
2161 reference frames of the first B-Frames after GOP I-Frame
2162 are missing (open gop)*/
2163 broken_link = get_bits1(&s->gb);
2164
2165 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2166 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2167 time_code_hours, time_code_minutes, time_code_seconds,
2168 time_code_pictures, closed_gop, broken_link);
2169 }
2170 /**
2171 * Finds the end of the current frame in the bitstream.
2172 * @return the position of the first byte of the next frame, or -1
2173 */
2174 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
2175 {
2176 int i;
2177 uint32_t state= pc->state;
2178
2179 /* EOF considered as end of frame */
2180 if (buf_size == 0)
2181 return 0;
2182
2183 /*
2184 0 frame start -> 1/4
2185 1 first_SEQEXT -> 0/2
2186 2 first field start -> 3/0
2187 3 second_SEQEXT -> 2/0
2188 4 searching end
2189 */
2190
2191 for(i=0; i<buf_size; i++){
2192 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2193 if(pc->frame_start_found&1){
2194 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2195 pc->frame_start_found--;
2196 else if(state == EXT_START_CODE+2){
2197 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2198 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2199 }
2200 state++;
2201 }else{
2202 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2203 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2204 i++;
2205 pc->frame_start_found=4;
2206 }
2207 if(state == SEQ_END_CODE){
2208 pc->state=-1;
2209 return i+1;
2210 }
2211 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2212 pc->frame_start_found= 0;
2213 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2214 pc->frame_start_found++;
2215 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2216 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2217 pc->frame_start_found=0;
2218 pc->state=-1;
2219 return i-3;
2220 }
2221 }
2222 }
2223 }
2224 pc->state= state;
2225 return END_NOT_FOUND;
2226 }
2227
2228 static int decode_chunks(AVCodecContext *avctx,
2229 AVFrame *picture, int *data_size,
2230 const uint8_t *buf, int buf_size);
2231
2232 /* handle buffering and image synchronisation */
2233 static int mpeg_decode_frame(AVCodecContext *avctx,
2234 void *data, int *data_size,
2235 const uint8_t *buf, int buf_size)
2236 {
2237 Mpeg1Context *s = avctx->priv_data;
2238 AVFrame *picture = data;
2239 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2240 dprintf(avctx, "fill_buffer\n");
2241
2242 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2243 /* special case for last picture */
2244 if (s2->low_delay==0 && s2->next_picture_ptr) {
2245 *picture= *(AVFrame*)s2->next_picture_ptr;
2246 s2->next_picture_ptr= NULL;
2247
2248 *data_size = sizeof(AVFrame);
2249 }
2250 return buf_size;
2251 }
2252
2253 if(s2->flags&CODEC_FLAG_TRUNCATED){
2254 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size);
2255
2256 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2257 return buf_size;
2258 }
2259
2260 #if 0
2261 if (s->repeat_field % 2 == 1) {
2262 s->repeat_field++;
2263 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2264 // s2->picture_number, s->repeat_field);
2265 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2266 *data_size = sizeof(AVPicture);
2267 goto the_end;
2268 }
2269 }
2270 #endif
2271
2272 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2"))
2273 vcr2_init_sequence(avctx);
2274
2275 s->slice_count= 0;
2276
2277 if(avctx->extradata && !avctx->frame_number)
2278 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2279
2280 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2281 }
2282
2283 static int decode_chunks(AVCodecContext *avctx,
2284 AVFrame *picture, int *data_size,
2285 const uint8_t *buf, int buf_size)
2286 {
2287 Mpeg1Context *s = avctx->priv_data;
2288 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2289 const uint8_t *buf_ptr = buf;
2290 const uint8_t *buf_end = buf + buf_size;
2291 int ret, input_size;
2292
2293 for(;;) {
2294 /* find next start code */
2295 uint32_t start_code = -1;
2296 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2297 if (start_code > 0x1ff){
2298 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2299 if(avctx->thread_count > 1){
2300 int i;
2301
2302 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2303 for(i=0; i<s->slice_count; i++)
2304 s2->error_count += s2->thread_context[i]->error_count;
2305 }
2306 if (slice_end(avctx, picture)) {
2307 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2308 *data_size = sizeof(AVPicture);
2309 }
2310 }
2311 s2->pict_type= 0;
2312 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2313 }
2314
2315 input_size = buf_end - buf_ptr;
2316
2317 if(avctx->debug & FF_DEBUG_STARTCODE){
2318 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2319 }
2320
2321 /* prepare data for next start code */
2322 switch(start_code) {
2323 case SEQ_START_CODE:
2324 mpeg1_decode_sequence(avctx, buf_ptr,
2325 input_size);
2326 break;
2327
2328 case PICTURE_START_CODE:
2329 /* we have a complete image: we try to decompress it */
2330 if(mpeg1_decode_picture(avctx,
2331 buf_ptr, input_size) < 0)
2332 s2->pict_type=0;
2333 break;
2334 case EXT_START_CODE:
2335 mpeg_decode_extension(avctx,
2336 buf_ptr, input_size);
2337 break;
2338 case USER_START_CODE:
2339 mpeg_decode_user_data(avctx,
2340 buf_ptr, input_size);
2341 break;
2342 case GOP_START_CODE:
2343 s2->first_field=0;
2344 mpeg_decode_gop(avctx,
2345 buf_ptr, input_size);
2346 break;
2347 default:
2348 if (start_code >= SLICE_MIN_START_CODE &&
2349 start_code <= SLICE_MAX_START_CODE) {
2350 int mb_y= start_code - SLICE_MIN_START_CODE;
2351
2352 if(s2->last_picture_ptr==NULL){
2353 /* Skip B-frames if we do not have reference frames. */
2354 if(s2->pict_type==FF_B_TYPE) break;
2355 }
2356 if(s2->next_picture_ptr==NULL){
2357 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2358 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2359 }
2360 /* Skip B-frames if we are in a hurry. */
2361 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2362 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2363 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2364 || avctx->skip_frame >= AVDISCARD_ALL)
2365 break;
2366 /* Skip everything if we are in a hurry>=5. */
2367 if(avctx->hurry_up>=5) break;
2368
2369 if (!s->mpeg_enc_ctx_allocated) break;
2370
2371 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2372 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2373 break;
2374 }
2375
2376 if(!s2->pict_type){
2377 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2378 break;
2379 }
2380
2381 if(s2->first_slice){
2382 s2->first_slice=0;
2383 if(mpeg_field_start(s2) < 0)
2384 return -1;
2385 }
2386 if(!s2->current_picture_ptr){
2387 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2388 return -1;
2389 }
2390
2391 if(avctx->thread_count > 1){
2392 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2393 if(threshold <= mb_y){
2394 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2395
2396 thread_context->start_mb_y= mb_y;
2397 thread_context->end_mb_y = s2->mb_height;
2398 if(s->slice_count){
2399 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2400 ff_update_duplicate_context(thread_context, s2);
2401 }
2402 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2403 s->slice_count++;
2404 }
2405 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2406 }else{
2407 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2408 emms_c();
2409
2410 if(ret < 0){
2411 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2412 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);
2413 }else{
2414 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);
2415 }
2416 }
2417 }
2418 break;
2419 }
2420 }
2421 }
2422
2423 static int mpeg_decode_end(AVCodecContext *avctx)
2424 {
2425 Mpeg1Context *s = avctx->priv_data;
2426
2427 if (s->mpeg_enc_ctx_allocated)
2428 MPV_common_end(&s->mpeg_enc_ctx);
2429 return 0;
2430 }
2431
2432 AVCodec mpeg1video_decoder = {
2433 "mpeg1video",
2434 CODEC_TYPE_VIDEO,
2435 CODEC_ID_MPEG1VIDEO,
2436 sizeof(Mpeg1Context),
2437 mpeg_decode_init,
2438 NULL,
2439 mpeg_decode_end,
2440 mpeg_decode_frame,
2441 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2442 .flush= ff_mpeg_flush,
2443 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2444 };
2445
2446 AVCodec mpeg2video_decoder = {
2447 "mpeg2video",
2448 CODEC_TYPE_VIDEO,
2449 CODEC_ID_MPEG2VIDEO,
2450 sizeof(Mpeg1Context),
2451 mpeg_decode_init,
2452 NULL,
2453 mpeg_decode_end,
2454 mpeg_decode_frame,
2455 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2456 .flush= ff_mpeg_flush,
2457 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2458 };
2459
2460 //legacy decoder
2461 AVCodec mpegvideo_decoder = {
2462 "mpegvideo",
2463 CODEC_TYPE_VIDEO,
2464 CODEC_ID_MPEG2VIDEO,
2465 sizeof(Mpeg1Context),
2466 mpeg_decode_init,
2467 NULL,
2468 mpeg_decode_end,
2469 mpeg_decode_frame,
2470 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2471 .flush= ff_mpeg_flush,
2472 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2473 };
2474
2475 #ifdef HAVE_XVMC
2476 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2477 Mpeg1Context *s;
2478
2479 if( avctx->thread_count > 1)
2480 return -1;
2481 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2482 return -1;
2483 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2484 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2485 }
2486 mpeg_decode_init(avctx);
2487 s = avctx->priv_data;
2488
2489 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2490 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2491
2492 return 0;
2493 }
2494
2495 AVCodec mpeg_xvmc_decoder = {
2496 "mpegvideo_xvmc",
2497 CODEC_TYPE_VIDEO,
2498 CODEC_ID_MPEG2VIDEO_XVMC,
2499 sizeof(Mpeg1Context),
2500 mpeg_mc_decode_init,
2501 NULL,
2502 mpeg_decode_end,
2503 mpeg_decode_frame,
2504 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2505 .flush= ff_mpeg_flush,
2506 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video XvMC (X-Video Motion Compensation)"),
2507 };
2508
2509 #endif
lucabe's unfinished and experimental patches for ffmpeg