?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
10l: typing mistake in r18888
[FFMpeg-mirror/lagarith.git] / libavcodec / mpeg12.c
blob021942a1831aa427832f3a15ff29f695a23381b2
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 #include "mpegvideo_common.h"
34
35 #include "mpeg12.h"
36 #include "mpeg12data.h"
37 #include "mpeg12decdata.h"
38 #include "bytestream.h"
39 #include "vdpau_internal.h"
40 #include "xvmc_internal.h"
41
42 //#undef NDEBUG
43 //#include <assert.h>
44
45
46 #define MV_VLC_BITS 9
47 #define MBINCR_VLC_BITS 9
48 #define MB_PAT_VLC_BITS 9
49 #define MB_PTYPE_VLC_BITS 6
50 #define MB_BTYPE_VLC_BITS 6
51
52 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
53 DCTELEM *block,
54 int n);
55 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
56 DCTELEM *block,
57 int n);
58 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
59 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
60 DCTELEM *block,
61 int n);
62 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
63 DCTELEM *block,
64 int n);
65 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
66 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
67 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
68 static void exchange_uv(MpegEncContext *s);
69
70 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
71 PIX_FMT_XVMC_MPEG2_IDCT,
72 PIX_FMT_XVMC_MPEG2_MC,
73 PIX_FMT_NONE};
74
75 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
76
77
78 #define INIT_2D_VLC_RL(rl, static_size)\
79 {\
80 static RL_VLC_ELEM rl_vlc_table[static_size];\
81 INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
82 &rl.table_vlc[0][1], 4, 2,\
83 &rl.table_vlc[0][0], 4, 2, static_size);\
84 \
85 rl.rl_vlc[0]= rl_vlc_table;\
86 init_2d_vlc_rl(&rl);\
87 }
88
89 static void init_2d_vlc_rl(RLTable *rl)
90 {
91 int i;
92
93 for(i=0; i<rl->vlc.table_size; i++){
94 int code= rl->vlc.table[i][0];
95 int len = rl->vlc.table[i][1];
96 int level, run;
97
98 if(len==0){ // illegal code
99 run= 65;
100 level= MAX_LEVEL;
101 }else if(len<0){ //more bits needed
102 run= 0;
103 level= code;
104 }else{
105 if(code==rl->n){ //esc
106 run= 65;
107 level= 0;
108 }else if(code==rl->n+1){ //eob
109 run= 0;
110 level= 127;
111 }else{
112 run= rl->table_run [code] + 1;
113 level= rl->table_level[code];
114 }
115 }
116 rl->rl_vlc[0][i].len= len;
117 rl->rl_vlc[0][i].level= level;
118 rl->rl_vlc[0][i].run= run;
119 }
120 }
121
122 void ff_mpeg12_common_init(MpegEncContext *s)
123 {
124
125 s->y_dc_scale_table=
126 s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
127
128 }
129
130 void ff_mpeg1_clean_buffers(MpegEncContext *s){
131 s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
132 s->last_dc[1] = s->last_dc[0];
133 s->last_dc[2] = s->last_dc[0];
134 memset(s->last_mv, 0, sizeof(s->last_mv));
135 }
136
137
138 /******************************************/
139 /* decoding */
140
141 static VLC mv_vlc;
142 static VLC mbincr_vlc;
143 static VLC mb_ptype_vlc;
144 static VLC mb_btype_vlc;
145 static VLC mb_pat_vlc;
146
147 av_cold void ff_mpeg12_init_vlcs(void)
148 {
149 static int done = 0;
150
151 if (!done) {
152 done = 1;
153
154 INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
155 ff_mpeg12_vlc_dc_lum_bits, 1, 1,
156 ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
157 INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
158 ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
159 ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
160 INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
161 &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
162 &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
163 INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
164 &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
165 &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
166 INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
167 &ff_mpeg12_mbPatTable[0][1], 2, 1,
168 &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
169
170 INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
171 &table_mb_ptype[0][1], 2, 1,
172 &table_mb_ptype[0][0], 2, 1, 64);
173 INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
174 &table_mb_btype[0][1], 2, 1,
175 &table_mb_btype[0][0], 2, 1, 64);
176 init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
177 init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
178
179 INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
180 INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
181 }
182 }
183
184 static inline int get_dmv(MpegEncContext *s)
185 {
186 if(get_bits1(&s->gb))
187 return 1 - (get_bits1(&s->gb) << 1);
188 else
189 return 0;
190 }
191
192 static inline int get_qscale(MpegEncContext *s)
193 {
194 int qscale = get_bits(&s->gb, 5);
195 if (s->q_scale_type) {
196 return non_linear_qscale[qscale];
197 } else {
198 return qscale << 1;
199 }
200 }
201
202 /* motion type (for MPEG-2) */
203 #define MT_FIELD 1
204 #define MT_FRAME 2
205 #define MT_16X8 2
206 #define MT_DMV 3
207
208 static int mpeg_decode_mb(MpegEncContext *s,
209 DCTELEM block[12][64])
210 {
211 int i, j, k, cbp, val, mb_type, motion_type;
212 const int mb_block_count = 4 + (1<< s->chroma_format);
213
214 dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
215
216 assert(s->mb_skipped==0);
217
218 if (s->mb_skip_run-- != 0) {
219 if (s->pict_type == FF_P_TYPE) {
220 s->mb_skipped = 1;
221 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
222 } else {
223 int mb_type;
224
225 if(s->mb_x)
226 mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
227 else
228 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
229 if(IS_INTRA(mb_type))
230 return -1;
231
232 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
233 mb_type | MB_TYPE_SKIP;
234 // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
235
236 if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
237 s->mb_skipped = 1;
238 }
239
240 return 0;
241 }
242
243 switch(s->pict_type) {
244 default:
245 case FF_I_TYPE:
246 if (get_bits1(&s->gb) == 0) {
247 if (get_bits1(&s->gb) == 0){
248 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
249 return -1;
250 }
251 mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
252 } else {
253 mb_type = MB_TYPE_INTRA;
254 }
255 break;
256 case FF_P_TYPE:
257 mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
258 if (mb_type < 0){
259 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
260 return -1;
261 }
262 mb_type = ptype2mb_type[ mb_type ];
263 break;
264 case FF_B_TYPE:
265 mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
266 if (mb_type < 0){
267 av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
268 return -1;
269 }
270 mb_type = btype2mb_type[ mb_type ];
271 break;
272 }
273 dprintf(s->avctx, "mb_type=%x\n", mb_type);
274 // motion_type = 0; /* avoid warning */
275 if (IS_INTRA(mb_type)) {
276 s->dsp.clear_blocks(s->block[0]);
277
278 if(!s->chroma_y_shift){
279 s->dsp.clear_blocks(s->block[6]);
280 }
281
282 /* compute DCT type */
283 if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
284 !s->frame_pred_frame_dct) {
285 s->interlaced_dct = get_bits1(&s->gb);
286 }
287
288 if (IS_QUANT(mb_type))
289 s->qscale = get_qscale(s);
290
291 if (s->concealment_motion_vectors) {
292 /* just parse them */
293 if (s->picture_structure != PICT_FRAME)
294 skip_bits1(&s->gb); /* field select */
295
296 s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
297 mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
298 s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
299 mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
300
301 skip_bits1(&s->gb); /* marker */
302 }else
303 memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
304 s->mb_intra = 1;
305 //if 1, we memcpy blocks in xvmcvideo
306 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
307 ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
308 if(s->swap_uv){
309 exchange_uv(s);
310 }
311 }
312
313 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
314 if(s->flags2 & CODEC_FLAG2_FAST){
315 for(i=0;i<6;i++) {
316 mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
317 }
318 }else{
319 for(i=0;i<mb_block_count;i++) {
320 if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
321 return -1;
322 }
323 }
324 } else {
325 for(i=0;i<6;i++) {
326 if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
327 return -1;
328 }
329 }
330 } else {
331 if (mb_type & MB_TYPE_ZERO_MV){
332 assert(mb_type & MB_TYPE_CBP);
333
334 s->mv_dir = MV_DIR_FORWARD;
335 if(s->picture_structure == PICT_FRAME){
336 if(!s->frame_pred_frame_dct)
337 s->interlaced_dct = get_bits1(&s->gb);
338 s->mv_type = MV_TYPE_16X16;
339 }else{
340 s->mv_type = MV_TYPE_FIELD;
341 mb_type |= MB_TYPE_INTERLACED;
342 s->field_select[0][0]= s->picture_structure - 1;
343 }
344
345 if (IS_QUANT(mb_type))
346 s->qscale = get_qscale(s);
347
348 s->last_mv[0][0][0] = 0;
349 s->last_mv[0][0][1] = 0;
350 s->last_mv[0][1][0] = 0;
351 s->last_mv[0][1][1] = 0;
352 s->mv[0][0][0] = 0;
353 s->mv[0][0][1] = 0;
354 }else{
355 assert(mb_type & MB_TYPE_L0L1);
356 //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
357 /* get additional motion vector type */
358 if (s->frame_pred_frame_dct)
359 motion_type = MT_FRAME;
360 else{
361 motion_type = get_bits(&s->gb, 2);
362 if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
363 s->interlaced_dct = get_bits1(&s->gb);
364 }
365
366 if (IS_QUANT(mb_type))
367 s->qscale = get_qscale(s);
368
369 /* motion vectors */
370 s->mv_dir= (mb_type>>13)&3;
371 dprintf(s->avctx, "motion_type=%d\n", motion_type);
372 switch(motion_type) {
373 case MT_FRAME: /* or MT_16X8 */
374 if (s->picture_structure == PICT_FRAME) {
375 mb_type |= MB_TYPE_16x16;
376 s->mv_type = MV_TYPE_16X16;
377 for(i=0;i<2;i++) {
378 if (USES_LIST(mb_type, i)) {
379 /* MT_FRAME */
380 s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
381 mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
382 s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
383 mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
384 /* full_pel: only for MPEG-1 */
385 if (s->full_pel[i]){
386 s->mv[i][0][0] <<= 1;
387 s->mv[i][0][1] <<= 1;
388 }
389 }
390 }
391 } else {
392 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
393 s->mv_type = MV_TYPE_16X8;
394 for(i=0;i<2;i++) {
395 if (USES_LIST(mb_type, i)) {
396 /* MT_16X8 */
397 for(j=0;j<2;j++) {
398 s->field_select[i][j] = get_bits1(&s->gb);
399 for(k=0;k<2;k++) {
400 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
401 s->last_mv[i][j][k]);
402 s->last_mv[i][j][k] = val;
403 s->mv[i][j][k] = val;
404 }
405 }
406 }
407 }
408 }
409 break;
410 case MT_FIELD:
411 s->mv_type = MV_TYPE_FIELD;
412 if (s->picture_structure == PICT_FRAME) {
413 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
414 for(i=0;i<2;i++) {
415 if (USES_LIST(mb_type, i)) {
416 for(j=0;j<2;j++) {
417 s->field_select[i][j] = get_bits1(&s->gb);
418 val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
419 s->last_mv[i][j][0]);
420 s->last_mv[i][j][0] = val;
421 s->mv[i][j][0] = val;
422 dprintf(s->avctx, "fmx=%d\n", val);
423 val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
424 s->last_mv[i][j][1] >> 1);
425 s->last_mv[i][j][1] = val << 1;
426 s->mv[i][j][1] = val;
427 dprintf(s->avctx, "fmy=%d\n", val);
428 }
429 }
430 }
431 } else {
432 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
433 for(i=0;i<2;i++) {
434 if (USES_LIST(mb_type, i)) {
435 s->field_select[i][0] = get_bits1(&s->gb);
436 for(k=0;k<2;k++) {
437 val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
438 s->last_mv[i][0][k]);
439 s->last_mv[i][0][k] = val;
440 s->last_mv[i][1][k] = val;
441 s->mv[i][0][k] = val;
442 }
443 }
444 }
445 }
446 break;
447 case MT_DMV:
448 s->mv_type = MV_TYPE_DMV;
449 for(i=0;i<2;i++) {
450 if (USES_LIST(mb_type, i)) {
451 int dmx, dmy, mx, my, m;
452 mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
453 s->last_mv[i][0][0]);
454 s->last_mv[i][0][0] = mx;
455 s->last_mv[i][1][0] = mx;
456 dmx = get_dmv(s);
457 my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
458 s->last_mv[i][0][1] >> 1);
459 dmy = get_dmv(s);
460
461
462 s->last_mv[i][0][1] = my<<1;
463 s->last_mv[i][1][1] = my<<1;
464
465 s->mv[i][0][0] = mx;
466 s->mv[i][0][1] = my;
467 s->mv[i][1][0] = mx;//not used
468 s->mv[i][1][1] = my;//not used
469
470 if (s->picture_structure == PICT_FRAME) {
471 mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
472
473 //m = 1 + 2 * s->top_field_first;
474 m = s->top_field_first ? 1 : 3;
475
476 /* top -> top pred */
477 s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
478 s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
479 m = 4 - m;
480 s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
481 s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
482 } else {
483 mb_type |= MB_TYPE_16x16;
484
485 s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
486 s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
487 if(s->picture_structure == PICT_TOP_FIELD)
488 s->mv[i][2][1]--;
489 else
490 s->mv[i][2][1]++;
491 }
492 }
493 }
494 break;
495 default:
496 av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
497 return -1;
498 }
499 }
500
501 s->mb_intra = 0;
502 if (HAS_CBP(mb_type)) {
503 s->dsp.clear_blocks(s->block[0]);
504
505 cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
506 if(mb_block_count > 6){
507 cbp<<= mb_block_count-6;
508 cbp |= get_bits(&s->gb, mb_block_count-6);
509 s->dsp.clear_blocks(s->block[6]);
510 }
511 if (cbp <= 0){
512 av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
513 return -1;
514 }
515
516 //if 1, we memcpy blocks in xvmcvideo
517 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
518 ff_xvmc_pack_pblocks(s,cbp);
519 if(s->swap_uv){
520 exchange_uv(s);
521 }
522 }
523
524 if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
525 if(s->flags2 & CODEC_FLAG2_FAST){
526 for(i=0;i<6;i++) {
527 if(cbp & 32) {
528 mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
529 } else {
530 s->block_last_index[i] = -1;
531 }
532 cbp+=cbp;
533 }
534 }else{
535 cbp<<= 12-mb_block_count;
536
537 for(i=0;i<mb_block_count;i++) {
538 if ( cbp & (1<<11) ) {
539 if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
540 return -1;
541 } else {
542 s->block_last_index[i] = -1;
543 }
544 cbp+=cbp;
545 }
546 }
547 } else {
548 if(s->flags2 & CODEC_FLAG2_FAST){
549 for(i=0;i<6;i++) {
550 if (cbp & 32) {
551 mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
552 } else {
553 s->block_last_index[i] = -1;
554 }
555 cbp+=cbp;
556 }
557 }else{
558 for(i=0;i<6;i++) {
559 if (cbp & 32) {
560 if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
561 return -1;
562 } else {
563 s->block_last_index[i] = -1;
564 }
565 cbp+=cbp;
566 }
567 }
568 }
569 }else{
570 for(i=0;i<12;i++)
571 s->block_last_index[i] = -1;
572 }
573 }
574
575 s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
576
577 return 0;
578 }
579
580 /* as H.263, but only 17 codes */
581 static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
582 {
583 int code, sign, val, l, shift;
584
585 code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
586 if (code == 0) {
587 return pred;
588 }
589 if (code < 0) {
590 return 0xffff;
591 }
592
593 sign = get_bits1(&s->gb);
594 shift = fcode - 1;
595 val = code;
596 if (shift) {
597 val = (val - 1) << shift;
598 val |= get_bits(&s->gb, shift);
599 val++;
600 }
601 if (sign)
602 val = -val;
603 val += pred;
604
605 /* modulo decoding */
606 l= INT_BIT - 5 - shift;
607 val = (val<<l)>>l;
608 return val;
609 }
610
611 static inline int mpeg1_decode_block_intra(MpegEncContext *s,
612 DCTELEM *block,
613 int n)
614 {
615 int level, dc, diff, i, j, run;
616 int component;
617 RLTable *rl = &ff_rl_mpeg1;
618 uint8_t * const scantable= s->intra_scantable.permutated;
619 const uint16_t *quant_matrix= s->intra_matrix;
620 const int qscale= s->qscale;
621
622 /* DC coefficient */
623 component = (n <= 3 ? 0 : n - 4 + 1);
624 diff = decode_dc(&s->gb, component);
625 if (diff >= 0xffff)
626 return -1;
627 dc = s->last_dc[component];
628 dc += diff;
629 s->last_dc[component] = dc;
630 block[0] = dc*quant_matrix[0];
631 dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
632 i = 0;
633 {
634 OPEN_READER(re, &s->gb);
635 /* now quantify & encode AC coefficients */
636 for(;;) {
637 UPDATE_CACHE(re, &s->gb);
638 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
639
640 if(level == 127){
641 break;
642 } else if(level != 0) {
643 i += run;
644 j = scantable[i];
645 level= (level*qscale*quant_matrix[j])>>4;
646 level= (level-1)|1;
647 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
648 LAST_SKIP_BITS(re, &s->gb, 1);
649 } else {
650 /* escape */
651 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
652 UPDATE_CACHE(re, &s->gb);
653 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
654 if (level == -128) {
655 level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
656 } else if (level == 0) {
657 level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
658 }
659 i += run;
660 j = scantable[i];
661 if(level<0){
662 level= -level;
663 level= (level*qscale*quant_matrix[j])>>4;
664 level= (level-1)|1;
665 level= -level;
666 }else{
667 level= (level*qscale*quant_matrix[j])>>4;
668 level= (level-1)|1;
669 }
670 }
671 if (i > 63){
672 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
673 return -1;
674 }
675
676 block[j] = level;
677 }
678 CLOSE_READER(re, &s->gb);
679 }
680 s->block_last_index[n] = i;
681 return 0;
682 }
683
684 int ff_mpeg1_decode_block_intra(MpegEncContext *s,
685 DCTELEM *block,
686 int n)
687 {
688 return mpeg1_decode_block_intra(s, block, n);
689 }
690
691 static inline int mpeg1_decode_block_inter(MpegEncContext *s,
692 DCTELEM *block,
693 int n)
694 {
695 int level, i, j, run;
696 RLTable *rl = &ff_rl_mpeg1;
697 uint8_t * const scantable= s->intra_scantable.permutated;
698 const uint16_t *quant_matrix= s->inter_matrix;
699 const int qscale= s->qscale;
700
701 {
702 OPEN_READER(re, &s->gb);
703 i = -1;
704 // special case for first coefficient, no need to add second VLC table
705 UPDATE_CACHE(re, &s->gb);
706 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
707 level= (3*qscale*quant_matrix[0])>>5;
708 level= (level-1)|1;
709 if(GET_CACHE(re, &s->gb)&0x40000000)
710 level= -level;
711 block[0] = level;
712 i++;
713 SKIP_BITS(re, &s->gb, 2);
714 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
715 goto end;
716 }
717 #if MIN_CACHE_BITS < 19
718 UPDATE_CACHE(re, &s->gb);
719 #endif
720 /* now quantify & encode AC coefficients */
721 for(;;) {
722 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
723
724 if(level != 0) {
725 i += run;
726 j = scantable[i];
727 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
728 level= (level-1)|1;
729 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
730 SKIP_BITS(re, &s->gb, 1);
731 } else {
732 /* escape */
733 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
734 UPDATE_CACHE(re, &s->gb);
735 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
736 if (level == -128) {
737 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
738 } else if (level == 0) {
739 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
740 }
741 i += run;
742 j = scantable[i];
743 if(level<0){
744 level= -level;
745 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
746 level= (level-1)|1;
747 level= -level;
748 }else{
749 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
750 level= (level-1)|1;
751 }
752 }
753 if (i > 63){
754 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
755 return -1;
756 }
757
758 block[j] = level;
759 #if MIN_CACHE_BITS < 19
760 UPDATE_CACHE(re, &s->gb);
761 #endif
762 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
763 break;
764 #if MIN_CACHE_BITS >= 19
765 UPDATE_CACHE(re, &s->gb);
766 #endif
767 }
768 end:
769 LAST_SKIP_BITS(re, &s->gb, 2);
770 CLOSE_READER(re, &s->gb);
771 }
772 s->block_last_index[n] = i;
773 return 0;
774 }
775
776 static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
777 {
778 int level, i, j, run;
779 RLTable *rl = &ff_rl_mpeg1;
780 uint8_t * const scantable= s->intra_scantable.permutated;
781 const int qscale= s->qscale;
782
783 {
784 OPEN_READER(re, &s->gb);
785 i = -1;
786 // special case for first coefficient, no need to add second VLC table
787 UPDATE_CACHE(re, &s->gb);
788 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
789 level= (3*qscale)>>1;
790 level= (level-1)|1;
791 if(GET_CACHE(re, &s->gb)&0x40000000)
792 level= -level;
793 block[0] = level;
794 i++;
795 SKIP_BITS(re, &s->gb, 2);
796 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
797 goto end;
798 }
799 #if MIN_CACHE_BITS < 19
800 UPDATE_CACHE(re, &s->gb);
801 #endif
802
803 /* now quantify & encode AC coefficients */
804 for(;;) {
805 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
806
807 if(level != 0) {
808 i += run;
809 j = scantable[i];
810 level= ((level*2+1)*qscale)>>1;
811 level= (level-1)|1;
812 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
813 SKIP_BITS(re, &s->gb, 1);
814 } else {
815 /* escape */
816 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
817 UPDATE_CACHE(re, &s->gb);
818 level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
819 if (level == -128) {
820 level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
821 } else if (level == 0) {
822 level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
823 }
824 i += run;
825 j = scantable[i];
826 if(level<0){
827 level= -level;
828 level= ((level*2+1)*qscale)>>1;
829 level= (level-1)|1;
830 level= -level;
831 }else{
832 level= ((level*2+1)*qscale)>>1;
833 level= (level-1)|1;
834 }
835 }
836
837 block[j] = level;
838 #if MIN_CACHE_BITS < 19
839 UPDATE_CACHE(re, &s->gb);
840 #endif
841 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
842 break;
843 #if MIN_CACHE_BITS >= 19
844 UPDATE_CACHE(re, &s->gb);
845 #endif
846 }
847 end:
848 LAST_SKIP_BITS(re, &s->gb, 2);
849 CLOSE_READER(re, &s->gb);
850 }
851 s->block_last_index[n] = i;
852 return 0;
853 }
854
855
856 static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
857 DCTELEM *block,
858 int n)
859 {
860 int level, i, j, run;
861 RLTable *rl = &ff_rl_mpeg1;
862 uint8_t * const scantable= s->intra_scantable.permutated;
863 const uint16_t *quant_matrix;
864 const int qscale= s->qscale;
865 int mismatch;
866
867 mismatch = 1;
868
869 {
870 OPEN_READER(re, &s->gb);
871 i = -1;
872 if (n < 4)
873 quant_matrix = s->inter_matrix;
874 else
875 quant_matrix = s->chroma_inter_matrix;
876
877 // special case for first coefficient, no need to add second VLC table
878 UPDATE_CACHE(re, &s->gb);
879 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
880 level= (3*qscale*quant_matrix[0])>>5;
881 if(GET_CACHE(re, &s->gb)&0x40000000)
882 level= -level;
883 block[0] = level;
884 mismatch ^= level;
885 i++;
886 SKIP_BITS(re, &s->gb, 2);
887 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
888 goto end;
889 }
890 #if MIN_CACHE_BITS < 19
891 UPDATE_CACHE(re, &s->gb);
892 #endif
893
894 /* now quantify & encode AC coefficients */
895 for(;;) {
896 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
897
898 if(level != 0) {
899 i += run;
900 j = scantable[i];
901 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
902 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
903 SKIP_BITS(re, &s->gb, 1);
904 } else {
905 /* escape */
906 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
907 UPDATE_CACHE(re, &s->gb);
908 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
909
910 i += run;
911 j = scantable[i];
912 if(level<0){
913 level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
914 level= -level;
915 }else{
916 level= ((level*2+1)*qscale*quant_matrix[j])>>5;
917 }
918 }
919 if (i > 63){
920 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
921 return -1;
922 }
923
924 mismatch ^= level;
925 block[j] = level;
926 #if MIN_CACHE_BITS < 19
927 UPDATE_CACHE(re, &s->gb);
928 #endif
929 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
930 break;
931 #if MIN_CACHE_BITS >= 19
932 UPDATE_CACHE(re, &s->gb);
933 #endif
934 }
935 end:
936 LAST_SKIP_BITS(re, &s->gb, 2);
937 CLOSE_READER(re, &s->gb);
938 }
939 block[63] ^= (mismatch & 1);
940
941 s->block_last_index[n] = i;
942 return 0;
943 }
944
945 static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
946 DCTELEM *block,
947 int n)
948 {
949 int level, i, j, run;
950 RLTable *rl = &ff_rl_mpeg1;
951 uint8_t * const scantable= s->intra_scantable.permutated;
952 const int qscale= s->qscale;
953 OPEN_READER(re, &s->gb);
954 i = -1;
955
956 // special case for first coefficient, no need to add second VLC table
957 UPDATE_CACHE(re, &s->gb);
958 if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
959 level= (3*qscale)>>1;
960 if(GET_CACHE(re, &s->gb)&0x40000000)
961 level= -level;
962 block[0] = level;
963 i++;
964 SKIP_BITS(re, &s->gb, 2);
965 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
966 goto end;
967 }
968 #if MIN_CACHE_BITS < 19
969 UPDATE_CACHE(re, &s->gb);
970 #endif
971
972 /* now quantify & encode AC coefficients */
973 for(;;) {
974 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
975
976 if(level != 0) {
977 i += run;
978 j = scantable[i];
979 level= ((level*2+1)*qscale)>>1;
980 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
981 SKIP_BITS(re, &s->gb, 1);
982 } else {
983 /* escape */
984 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
985 UPDATE_CACHE(re, &s->gb);
986 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
987
988 i += run;
989 j = scantable[i];
990 if(level<0){
991 level= ((-level*2+1)*qscale)>>1;
992 level= -level;
993 }else{
994 level= ((level*2+1)*qscale)>>1;
995 }
996 }
997
998 block[j] = level;
999 #if MIN_CACHE_BITS < 19
1000 UPDATE_CACHE(re, &s->gb);
1001 #endif
1002 if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1003 break;
1004 #if MIN_CACHE_BITS >=19
1005 UPDATE_CACHE(re, &s->gb);
1006 #endif
1007 }
1008 end:
1009 LAST_SKIP_BITS(re, &s->gb, 2);
1010 CLOSE_READER(re, &s->gb);
1011 s->block_last_index[n] = i;
1012 return 0;
1013 }
1014
1015
1016 static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1017 DCTELEM *block,
1018 int n)
1019 {
1020 int level, dc, diff, i, j, run;
1021 int component;
1022 RLTable *rl;
1023 uint8_t * const scantable= s->intra_scantable.permutated;
1024 const uint16_t *quant_matrix;
1025 const int qscale= s->qscale;
1026 int mismatch;
1027
1028 /* DC coefficient */
1029 if (n < 4){
1030 quant_matrix = s->intra_matrix;
1031 component = 0;
1032 }else{
1033 quant_matrix = s->chroma_intra_matrix;
1034 component = (n&1) + 1;
1035 }
1036 diff = decode_dc(&s->gb, component);
1037 if (diff >= 0xffff)
1038 return -1;
1039 dc = s->last_dc[component];
1040 dc += diff;
1041 s->last_dc[component] = dc;
1042 block[0] = dc << (3 - s->intra_dc_precision);
1043 dprintf(s->avctx, "dc=%d\n", block[0]);
1044 mismatch = block[0] ^ 1;
1045 i = 0;
1046 if (s->intra_vlc_format)
1047 rl = &ff_rl_mpeg2;
1048 else
1049 rl = &ff_rl_mpeg1;
1050
1051 {
1052 OPEN_READER(re, &s->gb);
1053 /* now quantify & encode AC coefficients */
1054 for(;;) {
1055 UPDATE_CACHE(re, &s->gb);
1056 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1057
1058 if(level == 127){
1059 break;
1060 } else if(level != 0) {
1061 i += run;
1062 j = scantable[i];
1063 level= (level*qscale*quant_matrix[j])>>4;
1064 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1065 LAST_SKIP_BITS(re, &s->gb, 1);
1066 } else {
1067 /* escape */
1068 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1069 UPDATE_CACHE(re, &s->gb);
1070 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1071 i += run;
1072 j = scantable[i];
1073 if(level<0){
1074 level= (-level*qscale*quant_matrix[j])>>4;
1075 level= -level;
1076 }else{
1077 level= (level*qscale*quant_matrix[j])>>4;
1078 }
1079 }
1080 if (i > 63){
1081 av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1082 return -1;
1083 }
1084
1085 mismatch^= level;
1086 block[j] = level;
1087 }
1088 CLOSE_READER(re, &s->gb);
1089 }
1090 block[63]^= mismatch&1;
1091
1092 s->block_last_index[n] = i;
1093 return 0;
1094 }
1095
1096 static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1097 DCTELEM *block,
1098 int n)
1099 {
1100 int level, dc, diff, j, run;
1101 int component;
1102 RLTable *rl;
1103 uint8_t * scantable= s->intra_scantable.permutated;
1104 const uint16_t *quant_matrix;
1105 const int qscale= s->qscale;
1106
1107 /* DC coefficient */
1108 if (n < 4){
1109 quant_matrix = s->intra_matrix;
1110 component = 0;
1111 }else{
1112 quant_matrix = s->chroma_intra_matrix;
1113 component = (n&1) + 1;
1114 }
1115 diff = decode_dc(&s->gb, component);
1116 if (diff >= 0xffff)
1117 return -1;
1118 dc = s->last_dc[component];
1119 dc += diff;
1120 s->last_dc[component] = dc;
1121 block[0] = dc << (3 - s->intra_dc_precision);
1122 if (s->intra_vlc_format)
1123 rl = &ff_rl_mpeg2;
1124 else
1125 rl = &ff_rl_mpeg1;
1126
1127 {
1128 OPEN_READER(re, &s->gb);
1129 /* now quantify & encode AC coefficients */
1130 for(;;) {
1131 UPDATE_CACHE(re, &s->gb);
1132 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1133
1134 if(level == 127){
1135 break;
1136 } else if(level != 0) {
1137 scantable += run;
1138 j = *scantable;
1139 level= (level*qscale*quant_matrix[j])>>4;
1140 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1141 LAST_SKIP_BITS(re, &s->gb, 1);
1142 } else {
1143 /* escape */
1144 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1145 UPDATE_CACHE(re, &s->gb);
1146 level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1147 scantable += run;
1148 j = *scantable;
1149 if(level<0){
1150 level= (-level*qscale*quant_matrix[j])>>4;
1151 level= -level;
1152 }else{
1153 level= (level*qscale*quant_matrix[j])>>4;
1154 }
1155 }
1156
1157 block[j] = level;
1158 }
1159 CLOSE_READER(re, &s->gb);
1160 }
1161
1162 s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1163 return 0;
1164 }
1165
1166 typedef struct Mpeg1Context {
1167 MpegEncContext mpeg_enc_ctx;
1168 int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1169 int repeat_field; /* true if we must repeat the field */
1170 AVPanScan pan_scan; /** some temporary storage for the panscan */
1171 int slice_count;
1172 int swap_uv;//indicate VCR2
1173 int save_aspect_info;
1174 int save_width, save_height, save_progressive_seq;
1175 AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1176
1177 } Mpeg1Context;
1178
1179 static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1180 {
1181 Mpeg1Context *s = avctx->priv_data;
1182 MpegEncContext *s2 = &s->mpeg_enc_ctx;
1183 int i;
1184
1185 /* we need some permutation to store matrices,
1186 * until MPV_common_init() sets the real permutation. */
1187 for(i=0;i<64;i++)
1188 s2->dsp.idct_permutation[i]=i;
1189
1190 MPV_decode_defaults(s2);
1191
1192 s->mpeg_enc_ctx.avctx= avctx;
1193 s->mpeg_enc_ctx.flags= avctx->flags;
1194 s->mpeg_enc_ctx.flags2= avctx->flags2;
1195 ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1196 ff_mpeg12_init_vlcs();
1197
1198 s->mpeg_enc_ctx_allocated = 0;
1199 s->mpeg_enc_ctx.picture_number = 0;
1200 s->repeat_field = 0;
1201 s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1202 avctx->color_range= AVCOL_RANGE_MPEG;
1203 if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1204 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1205 else
1206 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1207 return 0;
1208 }
1209
1210 static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1211 const uint8_t *new_perm){
1212 uint16_t temp_matrix[64];
1213 int i;
1214
1215 memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1216
1217 for(i=0;i<64;i++){
1218 matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1219 }
1220 }
1221
1222 static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1223 Mpeg1Context *s1 = avctx->priv_data;
1224 MpegEncContext *s = &s1->mpeg_enc_ctx;
1225
1226 if(avctx->xvmc_acceleration)
1227 return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1228 else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1229 if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1230 return PIX_FMT_VDPAU_MPEG1;
1231 else
1232 return PIX_FMT_VDPAU_MPEG2;
1233 }else{
1234 if(s->chroma_format < 2)
1235 return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1236 else if(s->chroma_format == 2)
1237 return PIX_FMT_YUV422P;
1238 else
1239 return PIX_FMT_YUV444P;
1240 }
1241 }
1242
1243 /* Call this function when we know all parameters.
1244 * It may be called in different places for MPEG-1 and MPEG-2. */
1245 static int mpeg_decode_postinit(AVCodecContext *avctx){
1246 Mpeg1Context *s1 = avctx->priv_data;
1247 MpegEncContext *s = &s1->mpeg_enc_ctx;
1248 uint8_t old_permutation[64];
1249
1250 if (
1251 (s1->mpeg_enc_ctx_allocated == 0)||
1252 avctx->coded_width != s->width ||
1253 avctx->coded_height != s->height||
1254 s1->save_width != s->width ||
1255 s1->save_height != s->height ||
1256 s1->save_aspect_info != s->aspect_ratio_info||
1257 s1->save_progressive_seq != s->progressive_sequence ||
1258 0)
1259 {
1260
1261 if (s1->mpeg_enc_ctx_allocated) {
1262 ParseContext pc= s->parse_context;
1263 s->parse_context.buffer=0;
1264 MPV_common_end(s);
1265 s->parse_context= pc;
1266 }
1267
1268 if( (s->width == 0 )||(s->height == 0))
1269 return -2;
1270
1271 avcodec_set_dimensions(avctx, s->width, s->height);
1272 avctx->bit_rate = s->bit_rate;
1273 s1->save_aspect_info = s->aspect_ratio_info;
1274 s1->save_width = s->width;
1275 s1->save_height = s->height;
1276 s1->save_progressive_seq = s->progressive_sequence;
1277
1278 /* low_delay may be forced, in this case we will have B-frames
1279 * that behave like P-frames. */
1280 avctx->has_b_frames = !(s->low_delay);
1281
1282 assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1283 if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1284 //MPEG-1 fps
1285 avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1286 avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1287 //MPEG-1 aspect
1288 avctx->sample_aspect_ratio= av_d2q(
1289 1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1290 avctx->ticks_per_frame=1;
1291 }else{//MPEG-2
1292 //MPEG-2 fps
1293 av_reduce(
1294 &s->avctx->time_base.den,
1295 &s->avctx->time_base.num,
1296 ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1297 ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1298 1<<30);
1299 avctx->ticks_per_frame=2;
1300 //MPEG-2 aspect
1301 if(s->aspect_ratio_info > 1){
1302 //we ignore the spec here as reality does not match the spec, see for example
1303 // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1304 if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1305 s->avctx->sample_aspect_ratio=
1306 av_div_q(
1307 ff_mpeg2_aspect[s->aspect_ratio_info],
1308 (AVRational){s->width, s->height}
1309 );
1310 }else{
1311 s->avctx->sample_aspect_ratio=
1312 av_div_q(
1313 ff_mpeg2_aspect[s->aspect_ratio_info],
1314 (AVRational){s1->pan_scan.width, s1->pan_scan.height}
1315 );
1316 }
1317 }else{
1318 s->avctx->sample_aspect_ratio=
1319 ff_mpeg2_aspect[s->aspect_ratio_info];
1320 }
1321 }//MPEG-2
1322
1323 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1324 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1325 //until then pix_fmt may be changed right after codec init
1326 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1327 avctx->hwaccel ||
1328 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1329 if( avctx->idct_algo == FF_IDCT_AUTO )
1330 avctx->idct_algo = FF_IDCT_SIMPLE;
1331
1332 /* Quantization matrices may need reordering
1333 * if DCT permutation is changed. */
1334 memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1335
1336 if (MPV_common_init(s) < 0)
1337 return -2;
1338
1339 quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1340 quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1341 quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1342 quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1343
1344 s1->mpeg_enc_ctx_allocated = 1;
1345 }
1346 return 0;
1347 }
1348
1349 static int mpeg1_decode_picture(AVCodecContext *avctx,
1350 const uint8_t *buf, int buf_size)
1351 {
1352 Mpeg1Context *s1 = avctx->priv_data;
1353 MpegEncContext *s = &s1->mpeg_enc_ctx;
1354 int ref, f_code, vbv_delay;
1355
1356 if(mpeg_decode_postinit(s->avctx) < 0)
1357 return -2;
1358
1359 init_get_bits(&s->gb, buf, buf_size*8);
1360
1361 ref = get_bits(&s->gb, 10); /* temporal ref */
1362 s->pict_type = get_bits(&s->gb, 3);
1363 if(s->pict_type == 0 || s->pict_type > 3)
1364 return -1;
1365
1366 vbv_delay= get_bits(&s->gb, 16);
1367 if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1368 s->full_pel[0] = get_bits1(&s->gb);
1369 f_code = get_bits(&s->gb, 3);
1370 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1371 return -1;
1372 s->mpeg_f_code[0][0] = f_code;
1373 s->mpeg_f_code[0][1] = f_code;
1374 }
1375 if (s->pict_type == FF_B_TYPE) {
1376 s->full_pel[1] = get_bits1(&s->gb);
1377 f_code = get_bits(&s->gb, 3);
1378 if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1379 return -1;
1380 s->mpeg_f_code[1][0] = f_code;
1381 s->mpeg_f_code[1][1] = f_code;
1382 }
1383 s->current_picture.pict_type= s->pict_type;
1384 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1385
1386 if(avctx->debug & FF_DEBUG_PICT_INFO)
1387 av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1388
1389 s->y_dc_scale = 8;
1390 s->c_dc_scale = 8;
1391 s->first_slice = 1;
1392 return 0;
1393 }
1394
1395 static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1396 {
1397 MpegEncContext *s= &s1->mpeg_enc_ctx;
1398 int horiz_size_ext, vert_size_ext;
1399 int bit_rate_ext;
1400
1401 skip_bits(&s->gb, 1); /* profile and level esc*/
1402 s->avctx->profile= get_bits(&s->gb, 3);
1403 s->avctx->level= get_bits(&s->gb, 4);
1404 s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1405 s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1406 horiz_size_ext = get_bits(&s->gb, 2);
1407 vert_size_ext = get_bits(&s->gb, 2);
1408 s->width |= (horiz_size_ext << 12);
1409 s->height |= (vert_size_ext << 12);
1410 bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1411 s->bit_rate += (bit_rate_ext << 18) * 400;
1412 skip_bits1(&s->gb); /* marker */
1413 s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1414
1415 s->low_delay = get_bits1(&s->gb);
1416 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1417
1418 s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1419 s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1420
1421 dprintf(s->avctx, "sequence extension\n");
1422 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1423 s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1424
1425 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1426 av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1427 s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1428
1429 }
1430
1431 static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1432 {
1433 MpegEncContext *s= &s1->mpeg_enc_ctx;
1434 int color_description, w, h;
1435
1436 skip_bits(&s->gb, 3); /* video format */
1437 color_description= get_bits1(&s->gb);
1438 if(color_description){
1439 s->avctx->color_primaries= get_bits(&s->gb, 8);
1440 s->avctx->color_trc = get_bits(&s->gb, 8);
1441 s->avctx->colorspace = get_bits(&s->gb, 8);
1442 }
1443 w= get_bits(&s->gb, 14);
1444 skip_bits(&s->gb, 1); //marker
1445 h= get_bits(&s->gb, 14);
1446 skip_bits(&s->gb, 1); //marker
1447
1448 s1->pan_scan.width= 16*w;
1449 s1->pan_scan.height=16*h;
1450
1451 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1452 av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1453 }
1454
1455 static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1456 {
1457 MpegEncContext *s= &s1->mpeg_enc_ctx;
1458 int i,nofco;
1459
1460 nofco = 1;
1461 if(s->progressive_sequence){
1462 if(s->repeat_first_field){
1463 nofco++;
1464 if(s->top_field_first)
1465 nofco++;
1466 }
1467 }else{
1468 if(s->picture_structure == PICT_FRAME){
1469 nofco++;
1470 if(s->repeat_first_field)
1471 nofco++;
1472 }
1473 }
1474 for(i=0; i<nofco; i++){
1475 s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1476 skip_bits(&s->gb, 1); //marker
1477 s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1478 skip_bits(&s->gb, 1); //marker
1479 }
1480
1481 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1482 av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1483 s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1484 s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1485 s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1486 );
1487 }
1488
1489 static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1490 int i;
1491
1492 for(i=0; i<64; i++) {
1493 int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1494 int v = get_bits(&s->gb, 8);
1495 if(v==0){
1496 av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1497 return -1;
1498 }
1499 if(intra && i==0 && v!=8){
1500 av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1501 v= 8; // needed by pink.mpg / issue1046
1502 }
1503 matrix0[j] = v;
1504 if(matrix1)
1505 matrix1[j] = v;
1506 }
1507 return 0;
1508 }
1509
1510 static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1511 {
1512 dprintf(s->avctx, "matrix extension\n");
1513
1514 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1515 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1516 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1517 if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1518 }
1519
1520 static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1521 {
1522 MpegEncContext *s= &s1->mpeg_enc_ctx;
1523
1524 s->full_pel[0] = s->full_pel[1] = 0;
1525 s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1526 s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1527 s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1528 s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1529 if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1530 av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1531 if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1532 if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1533 s->pict_type= FF_I_TYPE;
1534 else
1535 s->pict_type= FF_P_TYPE;
1536 }else
1537 s->pict_type= FF_B_TYPE;
1538 s->current_picture.pict_type= s->pict_type;
1539 s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1540 s->first_slice= 1;
1541 }
1542 s->intra_dc_precision = get_bits(&s->gb, 2);
1543 s->picture_structure = get_bits(&s->gb, 2);
1544 s->top_field_first = get_bits1(&s->gb);
1545 s->frame_pred_frame_dct = get_bits1(&s->gb);
1546 s->concealment_motion_vectors = get_bits1(&s->gb);
1547 s->q_scale_type = get_bits1(&s->gb);
1548 s->intra_vlc_format = get_bits1(&s->gb);
1549 s->alternate_scan = get_bits1(&s->gb);
1550 s->repeat_first_field = get_bits1(&s->gb);
1551 s->chroma_420_type = get_bits1(&s->gb);
1552 s->progressive_frame = get_bits1(&s->gb);
1553
1554 if(s->picture_structure == PICT_FRAME){
1555 s->first_field=0;
1556 s->v_edge_pos= 16*s->mb_height;
1557 }else{
1558 s->first_field ^= 1;
1559 s->v_edge_pos= 8*s->mb_height;
1560 memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1561 }
1562
1563 if(s->alternate_scan){
1564 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1565 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1566 }else{
1567 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1568 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1569 }
1570
1571 /* composite display not parsed */
1572 dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1573 dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1574 dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1575 dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1576 dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1577 dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1578 dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1579 dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1580 dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1581 }
1582
1583 static void mpeg_decode_extension(AVCodecContext *avctx,
1584 const uint8_t *buf, int buf_size)
1585 {
1586 Mpeg1Context *s1 = avctx->priv_data;
1587 MpegEncContext *s = &s1->mpeg_enc_ctx;
1588 int ext_type;
1589
1590 init_get_bits(&s->gb, buf, buf_size*8);
1591
1592 ext_type = get_bits(&s->gb, 4);
1593 switch(ext_type) {
1594 case 0x1:
1595 mpeg_decode_sequence_extension(s1);
1596 break;
1597 case 0x2:
1598 mpeg_decode_sequence_display_extension(s1);
1599 break;
1600 case 0x3:
1601 mpeg_decode_quant_matrix_extension(s);
1602 break;
1603 case 0x7:
1604 mpeg_decode_picture_display_extension(s1);
1605 break;
1606 case 0x8:
1607 mpeg_decode_picture_coding_extension(s1);
1608 break;
1609 }
1610 }
1611
1612 static void exchange_uv(MpegEncContext *s){
1613 DCTELEM (*tmp)[64];
1614
1615 tmp = s->pblocks[4];
1616 s->pblocks[4] = s->pblocks[5];
1617 s->pblocks[5] = tmp;
1618 }
1619
1620 static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1621 AVCodecContext *avctx= s->avctx;
1622 Mpeg1Context *s1 = (Mpeg1Context*)s;
1623
1624 /* start frame decoding */
1625 if(s->first_field || s->picture_structure==PICT_FRAME){
1626 if(MPV_frame_start(s, avctx) < 0)
1627 return -1;
1628
1629 ff_er_frame_start(s);
1630
1631 /* first check if we must repeat the frame */
1632 s->current_picture_ptr->repeat_pict = 0;
1633 if (s->repeat_first_field) {
1634 if (s->progressive_sequence) {
1635 if (s->top_field_first)
1636 s->current_picture_ptr->repeat_pict = 4;
1637 else
1638 s->current_picture_ptr->repeat_pict = 2;
1639 } else if (s->progressive_frame) {
1640 s->current_picture_ptr->repeat_pict = 1;
1641 }
1642 }
1643
1644 *s->current_picture_ptr->pan_scan= s1->pan_scan;
1645 }else{ //second field
1646 int i;
1647
1648 if(!s->current_picture_ptr){
1649 av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1650 return -1;
1651 }
1652
1653 for(i=0; i<4; i++){
1654 s->current_picture.data[i] = s->current_picture_ptr->data[i];
1655 if(s->picture_structure == PICT_BOTTOM_FIELD){
1656 s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1657 }
1658 }
1659 }
1660
1661 if (avctx->hwaccel) {
1662 if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1663 return -1;
1664 }
1665
1666 // MPV_frame_start will call this function too,
1667 // but we need to call it on every field
1668 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1669 if(ff_xvmc_field_start(s,avctx) < 0)
1670 return -1;
1671
1672 return 0;
1673 }
1674
1675 #define DECODE_SLICE_ERROR -1
1676 #define DECODE_SLICE_OK 0
1677
1678 /**
1679 * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1680 * @return DECODE_SLICE_ERROR if the slice is damaged<br>
1681 * DECODE_SLICE_OK if this slice is ok<br>
1682 */
1683 static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1684 const uint8_t **buf, int buf_size)
1685 {
1686 MpegEncContext *s = &s1->mpeg_enc_ctx;
1687 AVCodecContext *avctx= s->avctx;
1688 const int field_pic= s->picture_structure != PICT_FRAME;
1689 const int lowres= s->avctx->lowres;
1690
1691 s->resync_mb_x=
1692 s->resync_mb_y= -1;
1693
1694 if (mb_y<<field_pic >= s->mb_height){
1695 av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
1696 return -1;
1697 }
1698
1699 init_get_bits(&s->gb, *buf, buf_size*8);
1700
1701 ff_mpeg1_clean_buffers(s);
1702 s->interlaced_dct = 0;
1703
1704 s->qscale = get_qscale(s);
1705
1706 if(s->qscale == 0){
1707 av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1708 return -1;
1709 }
1710
1711 /* extra slice info */
1712 while (get_bits1(&s->gb) != 0) {
1713 skip_bits(&s->gb, 8);
1714 }
1715
1716 s->mb_x=0;
1717
1718 if (avctx->hwaccel) {
1719 const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1720 int start_code = -1;
1721 buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1722 if (buf_end < *buf + buf_size)
1723 buf_end -= 4;
1724 s->mb_y = mb_y;
1725 if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1726 return DECODE_SLICE_ERROR;
1727 *buf = buf_end;
1728 return DECODE_SLICE_OK;
1729 }
1730
1731 for(;;) {
1732 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1733 if (code < 0){
1734 av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1735 return -1;
1736 }
1737 if (code >= 33) {
1738 if (code == 33) {
1739 s->mb_x += 33;
1740 }
1741 /* otherwise, stuffing, nothing to do */
1742 } else {
1743 s->mb_x += code;
1744 break;
1745 }
1746 }
1747 if(s->mb_x >= (unsigned)s->mb_width){
1748 av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1749 return -1;
1750 }
1751
1752 s->resync_mb_x= s->mb_x;
1753 s->resync_mb_y= s->mb_y= mb_y;
1754 s->mb_skip_run= 0;
1755 ff_init_block_index(s);
1756
1757 if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1758 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1759 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",
1760 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],
1761 s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1762 s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1763 s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1764 s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1765 }
1766 }
1767
1768 for(;;) {
1769 //If 1, we memcpy blocks in xvmcvideo.
1770 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1771 ff_xvmc_init_block(s);//set s->block
1772
1773 if(mpeg_decode_mb(s, s->block) < 0)
1774 return -1;
1775
1776 if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1777 const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride;
1778 int xy = s->mb_x*2 + s->mb_y*2*wrap;
1779 int motion_x, motion_y, dir, i;
1780 if(field_pic && !s->first_field)
1781 xy += wrap/2;
1782
1783 for(i=0; i<2; i++){
1784 for(dir=0; dir<2; dir++){
1785 if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1786 motion_x = motion_y = 0;
1787 }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1788 motion_x = s->mv[dir][0][0];
1789 motion_y = s->mv[dir][0][1];
1790 } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1791 motion_x = s->mv[dir][i][0];
1792 motion_y = s->mv[dir][i][1];
1793 }
1794
1795 s->current_picture.motion_val[dir][xy ][0] = motion_x;
1796 s->current_picture.motion_val[dir][xy ][1] = motion_y;
1797 s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1798 s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1799 s->current_picture.ref_index [dir][xy ]=
1800 s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
1801 assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1802 }
1803 xy += wrap;
1804 }
1805 }
1806
1807 s->dest[0] += 16 >> lowres;
1808 s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1809 s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1810
1811 MPV_decode_mb(s, s->block);
1812
1813 if (++s->mb_x >= s->mb_width) {
1814 const int mb_size= 16>>s->avctx->lowres;
1815
1816 ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
1817
1818 s->mb_x = 0;
1819 s->mb_y++;
1820
1821 if(s->mb_y<<field_pic >= s->mb_height){
1822 int left= s->gb.size_in_bits - get_bits_count(&s->gb);
1823 int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1824 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1825 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1826
1827 if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1828 || (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1829 av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1830 return -1;
1831 }else
1832 goto eos;
1833 }
1834
1835 ff_init_block_index(s);
1836 }
1837
1838 /* skip mb handling */
1839 if (s->mb_skip_run == -1) {
1840 /* read increment again */
1841 s->mb_skip_run = 0;
1842 for(;;) {
1843 int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1844 if (code < 0){
1845 av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1846 return -1;
1847 }
1848 if (code >= 33) {
1849 if (code == 33) {
1850 s->mb_skip_run += 33;
1851 }else if(code == 35){
1852 if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1853 av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1854 return -1;
1855 }
1856 goto eos; /* end of slice */
1857 }
1858 /* otherwise, stuffing, nothing to do */
1859 } else {
1860 s->mb_skip_run += code;
1861 break;
1862 }
1863 }
1864 if(s->mb_skip_run){
1865 int i;
1866 if(s->pict_type == FF_I_TYPE){
1867 av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1868 return -1;
1869 }
1870
1871 /* skip mb */
1872 s->mb_intra = 0;
1873 for(i=0;i<12;i++)
1874 s->block_last_index[i] = -1;
1875 if(s->picture_structure == PICT_FRAME)
1876 s->mv_type = MV_TYPE_16X16;
1877 else
1878 s->mv_type = MV_TYPE_FIELD;
1879 if (s->pict_type == FF_P_TYPE) {
1880 /* if P type, zero motion vector is implied */
1881 s->mv_dir = MV_DIR_FORWARD;
1882 s->mv[0][0][0] = s->mv[0][0][1] = 0;
1883 s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1884 s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1885 s->field_select[0][0]= s->picture_structure - 1;
1886 } else {
1887 /* if B type, reuse previous vectors and directions */
1888 s->mv[0][0][0] = s->last_mv[0][0][0];
1889 s->mv[0][0][1] = s->last_mv[0][0][1];
1890 s->mv[1][0][0] = s->last_mv[1][0][0];
1891 s->mv[1][0][1] = s->last_mv[1][0][1];
1892 }
1893 }
1894 }
1895 }
1896 eos: // end of slice
1897 *buf += (get_bits_count(&s->gb)-1)/8;
1898 //printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1899 return 0;
1900 }
1901
1902 static int slice_decode_thread(AVCodecContext *c, void *arg){
1903 MpegEncContext *s= *(void**)arg;
1904 const uint8_t *buf= s->gb.buffer;
1905 int mb_y= s->start_mb_y;
1906
1907 s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
1908
1909 for(;;){
1910 uint32_t start_code;
1911 int ret;
1912
1913 ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1914 emms_c();
1915 //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1916 //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);
1917 if(ret < 0){
1918 if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1919 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);
1920 }else{
1921 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);
1922 }
1923
1924 if(s->mb_y == s->end_mb_y)
1925 return 0;
1926
1927 start_code= -1;
1928 buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1929 mb_y= start_code - SLICE_MIN_START_CODE;
1930 if(mb_y < 0 || mb_y >= s->end_mb_y)
1931 return -1;
1932 }
1933
1934 return 0; //not reached
1935 }
1936
1937 /**
1938 * Handles slice ends.
1939 * @return 1 if it seems to be the last slice
1940 */
1941 static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1942 {
1943 Mpeg1Context *s1 = avctx->priv_data;
1944 MpegEncContext *s = &s1->mpeg_enc_ctx;
1945
1946 if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1947 return 0;
1948
1949 if (s->avctx->hwaccel) {
1950 if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1951 av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1952 }
1953
1954 if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1955 ff_xvmc_field_end(s);
1956
1957 /* end of slice reached */
1958 if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1959 /* end of image */
1960
1961 s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1962
1963 ff_er_frame_end(s);
1964
1965 MPV_frame_end(s);
1966
1967 if (s->pict_type == FF_B_TYPE || s->low_delay) {
1968 *pict= *(AVFrame*)s->current_picture_ptr;
1969 ff_print_debug_info(s, pict);
1970 } else {
1971 s->picture_number++;
1972 /* latency of 1 frame for I- and P-frames */
1973 /* XXX: use another variable than picture_number */
1974 if (s->last_picture_ptr != NULL) {
1975 *pict= *(AVFrame*)s->last_picture_ptr;
1976 ff_print_debug_info(s, pict);
1977 }
1978 }
1979
1980 return 1;
1981 } else {
1982 return 0;
1983 }
1984 }
1985
1986 static int mpeg1_decode_sequence(AVCodecContext *avctx,
1987 const uint8_t *buf, int buf_size)
1988 {
1989 Mpeg1Context *s1 = avctx->priv_data;
1990 MpegEncContext *s = &s1->mpeg_enc_ctx;
1991 int width,height;
1992 int i, v, j;
1993
1994 init_get_bits(&s->gb, buf, buf_size*8);
1995
1996 width = get_bits(&s->gb, 12);
1997 height = get_bits(&s->gb, 12);
1998 if (width <= 0 || height <= 0)
1999 return -1;
2000 s->aspect_ratio_info= get_bits(&s->gb, 4);
2001 if (s->aspect_ratio_info == 0) {
2002 av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2003 if (avctx->error_recognition >= FF_ER_COMPLIANT)
2004 return -1;
2005 }
2006 s->frame_rate_index = get_bits(&s->gb, 4);
2007 if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
2008 return -1;
2009 s->bit_rate = get_bits(&s->gb, 18) * 400;
2010 if (get_bits1(&s->gb) == 0) /* marker */
2011 return -1;
2012 s->width = width;
2013 s->height = height;
2014
2015 s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2016 skip_bits(&s->gb, 1);
2017
2018 /* get matrix */
2019 if (get_bits1(&s->gb)) {
2020 load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2021 } else {
2022 for(i=0;i<64;i++) {
2023 j = s->dsp.idct_permutation[i];
2024 v = ff_mpeg1_default_intra_matrix[i];
2025 s->intra_matrix[j] = v;
2026 s->chroma_intra_matrix[j] = v;
2027 }
2028 }
2029 if (get_bits1(&s->gb)) {
2030 load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2031 } else {
2032 for(i=0;i<64;i++) {
2033 int j= s->dsp.idct_permutation[i];
2034 v = ff_mpeg1_default_non_intra_matrix[i];
2035 s->inter_matrix[j] = v;
2036 s->chroma_inter_matrix[j] = v;
2037 }
2038 }
2039
2040 if(show_bits(&s->gb, 23) != 0){
2041 av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2042 return -1;
2043 }
2044
2045 /* we set MPEG-2 parameters so that it emulates MPEG-1 */
2046 s->progressive_sequence = 1;
2047 s->progressive_frame = 1;
2048 s->picture_structure = PICT_FRAME;
2049 s->frame_pred_frame_dct = 1;
2050 s->chroma_format = 1;
2051 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2052 avctx->sub_id = 1; /* indicates MPEG-1 */
2053 s->out_format = FMT_MPEG1;
2054 s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2055 if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2056
2057 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2058 av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2059 s->avctx->rc_buffer_size, s->bit_rate);
2060
2061 return 0;
2062 }
2063
2064 static int vcr2_init_sequence(AVCodecContext *avctx)
2065 {
2066 Mpeg1Context *s1 = avctx->priv_data;
2067 MpegEncContext *s = &s1->mpeg_enc_ctx;
2068 int i, v;
2069
2070 /* start new MPEG-1 context decoding */
2071 s->out_format = FMT_MPEG1;
2072 if (s1->mpeg_enc_ctx_allocated) {
2073 MPV_common_end(s);
2074 }
2075 s->width = avctx->coded_width;
2076 s->height = avctx->coded_height;
2077 avctx->has_b_frames= 0; //true?
2078 s->low_delay= 1;
2079
2080 avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2081 avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2082
2083 if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2084 s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2085 if( avctx->idct_algo == FF_IDCT_AUTO )
2086 avctx->idct_algo = FF_IDCT_SIMPLE;
2087
2088 if (MPV_common_init(s) < 0)
2089 return -1;
2090 exchange_uv(s);//common init reset pblocks, so we swap them here
2091 s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2092 s1->mpeg_enc_ctx_allocated = 1;
2093
2094 for(i=0;i<64;i++) {
2095 int j= s->dsp.idct_permutation[i];
2096 v = ff_mpeg1_default_intra_matrix[i];
2097 s->intra_matrix[j] = v;
2098 s->chroma_intra_matrix[j] = v;
2099
2100 v = ff_mpeg1_default_non_intra_matrix[i];
2101 s->inter_matrix[j] = v;
2102 s->chroma_inter_matrix[j] = v;
2103 }
2104
2105 s->progressive_sequence = 1;
2106 s->progressive_frame = 1;
2107 s->picture_structure = PICT_FRAME;
2108 s->frame_pred_frame_dct = 1;
2109 s->chroma_format = 1;
2110 s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2111 avctx->sub_id = 2; /* indicates MPEG-2 */
2112 return 0;
2113 }
2114
2115
2116 static void mpeg_decode_user_data(AVCodecContext *avctx,
2117 const uint8_t *buf, int buf_size)
2118 {
2119 const uint8_t *p;
2120 int len, flags;
2121 p = buf;
2122 len = buf_size;
2123
2124 /* we parse the DTG active format information */
2125 if (len >= 5 &&
2126 p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2127 flags = p[4];
2128 p += 5;
2129 len -= 5;
2130 if (flags & 0x80) {
2131 /* skip event id */
2132 if (len < 2)
2133 return;
2134 p += 2;
2135 len -= 2;
2136 }
2137 if (flags & 0x40) {
2138 if (len < 1)
2139 return;
2140 avctx->dtg_active_format = p[0] & 0x0f;
2141 }
2142 }
2143 }
2144
2145 static void mpeg_decode_gop(AVCodecContext *avctx,
2146 const uint8_t *buf, int buf_size){
2147 Mpeg1Context *s1 = avctx->priv_data;
2148 MpegEncContext *s = &s1->mpeg_enc_ctx;
2149
2150 int drop_frame_flag;
2151 int time_code_hours, time_code_minutes;
2152 int time_code_seconds, time_code_pictures;
2153 int broken_link;
2154
2155 init_get_bits(&s->gb, buf, buf_size*8);
2156
2157 drop_frame_flag = get_bits1(&s->gb);
2158
2159 time_code_hours=get_bits(&s->gb,5);
2160 time_code_minutes = get_bits(&s->gb,6);
2161 skip_bits1(&s->gb);//marker bit
2162 time_code_seconds = get_bits(&s->gb,6);
2163 time_code_pictures = get_bits(&s->gb,6);
2164
2165 s->closed_gop = get_bits1(&s->gb);
2166 /*broken_link indicate that after editing the
2167 reference frames of the first B-Frames after GOP I-Frame
2168 are missing (open gop)*/
2169 broken_link = get_bits1(&s->gb);
2170
2171 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2172 av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2173 time_code_hours, time_code_minutes, time_code_seconds,
2174 time_code_pictures, s->closed_gop, broken_link);
2175 }
2176 /**
2177 * Finds the end of the current frame in the bitstream.
2178 * @return the position of the first byte of the next frame, or -1
2179 */
2180 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2181 {
2182 int i;
2183 uint32_t state= pc->state;
2184
2185 /* EOF considered as end of frame */
2186 if (buf_size == 0)
2187 return 0;
2188
2189 /*
2190 0 frame start -> 1/4
2191 1 first_SEQEXT -> 0/2
2192 2 first field start -> 3/0
2193 3 second_SEQEXT -> 2/0
2194 4 searching end
2195 */
2196
2197 for(i=0; i<buf_size; i++){
2198 assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
2199 if(pc->frame_start_found&1){
2200 if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
2201 pc->frame_start_found--;
2202 else if(state == EXT_START_CODE+2){
2203 if((buf[i]&3) == 3) pc->frame_start_found= 0;
2204 else pc->frame_start_found= (pc->frame_start_found+1)&3;
2205 }
2206 state++;
2207 }else{
2208 i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
2209 if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
2210 i++;
2211 pc->frame_start_found=4;
2212 }
2213 if(state == SEQ_END_CODE){
2214 pc->state=-1;
2215 return i+1;
2216 }
2217 if(pc->frame_start_found==2 && state == SEQ_START_CODE)
2218 pc->frame_start_found= 0;
2219 if(pc->frame_start_found<4 && state == EXT_START_CODE)
2220 pc->frame_start_found++;
2221 if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
2222 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
2223 pc->frame_start_found=0;
2224 pc->state=-1;
2225 return i-3;
2226 }
2227 }
2228 if(s && state == PICTURE_START_CODE){
2229 ff_fetch_timestamp(s, i-4, 1);
2230 }
2231 }
2232 }
2233 pc->state= state;
2234 return END_NOT_FOUND;
2235 }
2236
2237 static int decode_chunks(AVCodecContext *avctx,
2238 AVFrame *picture, int *data_size,
2239 const uint8_t *buf, int buf_size);
2240
2241 /* handle buffering and image synchronisation */
2242 static int mpeg_decode_frame(AVCodecContext *avctx,
2243 void *data, int *data_size,
2244 AVPacket *avpkt)
2245 {
2246 const uint8_t *buf = avpkt->data;
2247 int buf_size = avpkt->size;
2248 Mpeg1Context *s = avctx->priv_data;
2249 AVFrame *picture = data;
2250 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2251 dprintf(avctx, "fill_buffer\n");
2252
2253 if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2254 /* special case for last picture */
2255 if (s2->low_delay==0 && s2->next_picture_ptr) {
2256 *picture= *(AVFrame*)s2->next_picture_ptr;
2257 s2->next_picture_ptr= NULL;
2258
2259 *data_size = sizeof(AVFrame);
2260 }
2261 return buf_size;
2262 }
2263
2264 if(s2->flags&CODEC_FLAG_TRUNCATED){
2265 int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2266
2267 if( ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
2268 return buf_size;
2269 }
2270
2271 #if 0
2272 if (s->repeat_field % 2 == 1) {
2273 s->repeat_field++;
2274 //fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
2275 // s2->picture_number, s->repeat_field);
2276 if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
2277 *data_size = sizeof(AVPicture);
2278 goto the_end;
2279 }
2280 }
2281 #endif
2282
2283 if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
2284 vcr2_init_sequence(avctx);
2285
2286 s->slice_count= 0;
2287
2288 if(avctx->extradata && !avctx->frame_number)
2289 decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2290
2291 return decode_chunks(avctx, picture, data_size, buf, buf_size);
2292 }
2293
2294 static int decode_chunks(AVCodecContext *avctx,
2295 AVFrame *picture, int *data_size,
2296 const uint8_t *buf, int buf_size)
2297 {
2298 Mpeg1Context *s = avctx->priv_data;
2299 MpegEncContext *s2 = &s->mpeg_enc_ctx;
2300 const uint8_t *buf_ptr = buf;
2301 const uint8_t *buf_end = buf + buf_size;
2302 int ret, input_size;
2303
2304 for(;;) {
2305 /* find next start code */
2306 uint32_t start_code = -1;
2307 buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
2308 if (start_code > 0x1ff){
2309 if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
2310 if(avctx->thread_count > 1){
2311 int i;
2312
2313 avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
2314 for(i=0; i<s->slice_count; i++)
2315 s2->error_count += s2->thread_context[i]->error_count;
2316 }
2317
2318 if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
2319 ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2320
2321 if (slice_end(avctx, picture)) {
2322 if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
2323 *data_size = sizeof(AVPicture);
2324 }
2325 }
2326 s2->pict_type= 0;
2327 return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2328 }
2329
2330 input_size = buf_end - buf_ptr;
2331
2332 if(avctx->debug & FF_DEBUG_STARTCODE){
2333 av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2334 }
2335
2336 /* prepare data for next start code */
2337 switch(start_code) {
2338 case SEQ_START_CODE:
2339 mpeg1_decode_sequence(avctx, buf_ptr,
2340 input_size);
2341 break;
2342
2343 case PICTURE_START_CODE:
2344 /* we have a complete image: we try to decompress it */
2345 if(mpeg1_decode_picture(avctx,
2346 buf_ptr, input_size) < 0)
2347 s2->pict_type=0;
2348 break;
2349 case EXT_START_CODE:
2350 mpeg_decode_extension(avctx,
2351 buf_ptr, input_size);
2352 break;
2353 case USER_START_CODE:
2354 mpeg_decode_user_data(avctx,
2355 buf_ptr, input_size);
2356 break;
2357 case GOP_START_CODE:
2358 s2->first_field=0;
2359 mpeg_decode_gop(avctx,
2360 buf_ptr, input_size);
2361 break;
2362 default:
2363 if (start_code >= SLICE_MIN_START_CODE &&
2364 start_code <= SLICE_MAX_START_CODE) {
2365 int mb_y= start_code - SLICE_MIN_START_CODE;
2366
2367 if(s2->last_picture_ptr==NULL){
2368 /* Skip B-frames if we do not have reference frames and gop is not closed */
2369 if(s2->pict_type==FF_B_TYPE){
2370 int i;
2371 if(!s2->closed_gop)
2372 break;
2373 /* Allocate a dummy frame */
2374 i= ff_find_unused_picture(s2, 0);
2375 s2->last_picture_ptr= &s2->picture[i];
2376 if(alloc_picture(s2, s2->last_picture_ptr, 0) < 0)
2377 return -1;
2378 }
2379 }
2380 if(s2->next_picture_ptr==NULL){
2381 /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
2382 if(s2->pict_type==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
2383 }
2384 /* Skip B-frames if we are in a hurry. */
2385 if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
2386 if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
2387 ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
2388 || avctx->skip_frame >= AVDISCARD_ALL)
2389 break;
2390 /* Skip everything if we are in a hurry>=5. */
2391 if(avctx->hurry_up>=5) break;
2392
2393 if (!s->mpeg_enc_ctx_allocated) break;
2394
2395 if(s2->codec_id == CODEC_ID_MPEG2VIDEO){
2396 if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
2397 break;
2398 }
2399
2400 if(!s2->pict_type){
2401 av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2402 break;
2403 }
2404
2405 if(s2->first_slice){
2406 s2->first_slice=0;
2407 if(mpeg_field_start(s2, buf, buf_size) < 0)
2408 return -1;
2409 }
2410 if(!s2->current_picture_ptr){
2411 av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
2412 return -1;
2413 }
2414
2415 if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
2416 s->slice_count++;
2417 break;
2418 }
2419
2420 if(avctx->thread_count > 1){
2421 int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count;
2422 if(threshold <= mb_y){
2423 MpegEncContext *thread_context= s2->thread_context[s->slice_count];
2424
2425 thread_context->start_mb_y= mb_y;
2426 thread_context->end_mb_y = s2->mb_height;
2427 if(s->slice_count){
2428 s2->thread_context[s->slice_count-1]->end_mb_y= mb_y;
2429 ff_update_duplicate_context(thread_context, s2);
2430 }
2431 init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
2432 s->slice_count++;
2433 }
2434 buf_ptr += 2; //FIXME add minimum number of bytes per slice
2435 }else{
2436 ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size);
2437 emms_c();
2438
2439 if(ret < 0){
2440 if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
2441 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);
2442 }else{
2443 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);
2444 }
2445 }
2446 }
2447 break;
2448 }
2449 }
2450 }
2451
2452 static int mpeg_decode_end(AVCodecContext *avctx)
2453 {
2454 Mpeg1Context *s = avctx->priv_data;
2455
2456 if (s->mpeg_enc_ctx_allocated)
2457 MPV_common_end(&s->mpeg_enc_ctx);
2458 return 0;
2459 }
2460
2461 AVCodec mpeg1video_decoder = {
2462 "mpeg1video",
2463 CODEC_TYPE_VIDEO,
2464 CODEC_ID_MPEG1VIDEO,
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 AVCodec mpeg2video_decoder = {
2476 "mpeg2video",
2477 CODEC_TYPE_VIDEO,
2478 CODEC_ID_MPEG2VIDEO,
2479 sizeof(Mpeg1Context),
2480 mpeg_decode_init,
2481 NULL,
2482 mpeg_decode_end,
2483 mpeg_decode_frame,
2484 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2485 .flush= ff_mpeg_flush,
2486 .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2487 };
2488
2489 //legacy decoder
2490 AVCodec mpegvideo_decoder = {
2491 "mpegvideo",
2492 CODEC_TYPE_VIDEO,
2493 CODEC_ID_MPEG2VIDEO,
2494 sizeof(Mpeg1Context),
2495 mpeg_decode_init,
2496 NULL,
2497 mpeg_decode_end,
2498 mpeg_decode_frame,
2499 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
2500 .flush= ff_mpeg_flush,
2501 .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2502 };
2503
2504 #if CONFIG_MPEG_XVMC_DECODER
2505 static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
2506 if( avctx->thread_count > 1)
2507 return -1;
2508 if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
2509 return -1;
2510 if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
2511 dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2512 }
2513 mpeg_decode_init(avctx);
2514
2515 avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
2516 avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
2517
2518 return 0;
2519 }
2520
2521 AVCodec mpeg_xvmc_decoder = {
2522 "mpegvideo_xvmc",
2523 CODEC_TYPE_VIDEO,
2524 CODEC_ID_MPEG2VIDEO_XVMC,
2525 sizeof(Mpeg1Context),
2526 mpeg_mc_decode_init,
2527 NULL,
2528 mpeg_decode_end,
2529 mpeg_decode_frame,
2530 CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2531 .flush= ff_mpeg_flush,
2532 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2533 };
2534
2535 #endif
2536
2537 #if CONFIG_MPEG_VDPAU_DECODER
2538 AVCodec mpeg_vdpau_decoder = {
2539 "mpegvideo_vdpau",
2540 CODEC_TYPE_VIDEO,
2541 CODEC_ID_MPEG2VIDEO,
2542 sizeof(Mpeg1Context),
2543 mpeg_decode_init,
2544 NULL,
2545 mpeg_decode_end,
2546 mpeg_decode_frame,
2547 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2548 .flush= ff_mpeg_flush,
2549 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2550 };
2551 #endif
2552
2553 #if CONFIG_MPEG1_VDPAU_DECODER
2554 AVCodec mpeg1_vdpau_decoder = {
2555 "mpeg1video_vdpau",
2556 CODEC_TYPE_VIDEO,
2557 CODEC_ID_MPEG1VIDEO,
2558 sizeof(Mpeg1Context),
2559 mpeg_decode_init,
2560 NULL,
2561 mpeg_decode_end,
2562 mpeg_decode_frame,
2563 CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
2564 .flush= ff_mpeg_flush,
2565 .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2566 };
2567 #endif
2568
ffmpeg Lagarith lossless decoder