1 /*
2 * ITU H.263 bitstream decoder
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * H.263+ support.
5 * Copyright (c) 2001 Juan J. Sierralta P
6 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 /**
26 * @file
27 * H.263 decoder.
28 */
29
30 #define UNCHECKED_BITSTREAM_READER 1
31 #include <limits.h>
32
33 #include "libavutil/attributes.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/mem_internal.h"
38 #include "avcodec.h"
39 #include "mpegvideo.h"
40 #include "h263.h"
41 #include "h263data.h"
42 #include "internal.h"
43 #include "mathops.h"
44 #include "mpegutils.h"
45 #include "unary.h"
46 #include "flv.h"
47 #include "rv10.h"
48 #include "mpeg4video.h"
49 #include "mpegvideodata.h"
50
51 // The defines below define the number of bits that are read at once for
52 // reading vlc values. Changing these may improve speed and data cache needs
53 // be aware though that decreasing them may need the number of stages that is
54 // passed to get_vlc* to be increased.
55 #define H263_MBTYPE_B_VLC_BITS 6
56 #define CBPC_B_VLC_BITS 3
57
58 static const int h263_mb_type_b_map[15]= {
59 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
60 MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
61 MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
62 MB_TYPE_L0 | MB_TYPE_16x16,
63 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16,
64 MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
65 MB_TYPE_L1 | MB_TYPE_16x16,
66 MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16,
67 MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
68 MB_TYPE_L0L1 | MB_TYPE_16x16,
69 MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16,
70 MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
71 0, //stuffing
72 MB_TYPE_INTRA4x4 | MB_TYPE_CBP,
73 MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT,
74 };
75
ff_h263_show_pict_info(MpegEncContext * s)76 void ff_h263_show_pict_info(MpegEncContext *s){
77 if(s->avctx->debug&FF_DEBUG_PICT_INFO){
78 av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n",
79 s->qscale, av_get_picture_type_char(s->pict_type),
80 s->gb.size_in_bits, 1-s->no_rounding,
81 s->obmc ? " AP" : "",
82 s->umvplus ? " UMV" : "",
83 s->h263_long_vectors ? " LONG" : "",
84 s->h263_plus ? " +" : "",
85 s->h263_aic ? " AIC" : "",
86 s->alt_inter_vlc ? " AIV" : "",
87 s->modified_quant ? " MQ" : "",
88 s->loop_filter ? " LOOP" : "",
89 s->h263_slice_structured ? " SS" : "",
90 s->avctx->framerate.num, s->avctx->framerate.den
91 );
92 }
93 }
94
95 /***********************************************/
96 /* decoding */
97
98 VLC ff_h263_intra_MCBPC_vlc;
99 VLC ff_h263_inter_MCBPC_vlc;
100 VLC ff_h263_cbpy_vlc;
101 VLC ff_h263_mv_vlc;
102 static VLC h263_mbtype_b_vlc;
103 static VLC cbpc_b_vlc;
104
105 /* init vlcs */
106
107 /* XXX: find a better solution to handle static init */
ff_h263_decode_init_vlc(void)108 av_cold void ff_h263_decode_init_vlc(void)
109 {
110 static volatile int done = 0;
111
112 if (!done) {
113 INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
114 ff_h263_intra_MCBPC_bits, 1, 1,
115 ff_h263_intra_MCBPC_code, 1, 1, 72);
116 INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
117 ff_h263_inter_MCBPC_bits, 1, 1,
118 ff_h263_inter_MCBPC_code, 1, 1, 198);
119 INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
120 &ff_h263_cbpy_tab[0][1], 2, 1,
121 &ff_h263_cbpy_tab[0][0], 2, 1, 64);
122 INIT_VLC_STATIC(&ff_h263_mv_vlc, H263_MV_VLC_BITS, 33,
123 &ff_mvtab[0][1], 2, 1,
124 &ff_mvtab[0][0], 2, 1, 538);
125 ff_h263_init_rl_inter();
126 INIT_VLC_RL(ff_h263_rl_inter, 554);
127 INIT_FIRST_VLC_RL(ff_rl_intra_aic, 554);
128 INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
129 &ff_h263_mbtype_b_tab[0][1], 2, 1,
130 &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
131 INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
132 &ff_cbpc_b_tab[0][1], 2, 1,
133 &ff_cbpc_b_tab[0][0], 2, 1, 8);
134 done = 1;
135 }
136 }
137
ff_h263_decode_mba(MpegEncContext * s)138 int ff_h263_decode_mba(MpegEncContext *s)
139 {
140 int i, mb_pos;
141
142 for (i = 0; i < 6; i++)
143 if (s->mb_num - 1 <= ff_mba_max[i])
144 break;
145 mb_pos = get_bits(&s->gb, ff_mba_length[i]);
146 s->mb_x = mb_pos % s->mb_width;
147 s->mb_y = mb_pos / s->mb_width;
148
149 return mb_pos;
150 }
151
152 /**
153 * Decode the group of blocks header or slice header.
154 * @return <0 if an error occurred
155 */
h263_decode_gob_header(MpegEncContext * s)156 static int h263_decode_gob_header(MpegEncContext *s)
157 {
158 unsigned int val, gob_number;
159 int left;
160
161 /* Check for GOB Start Code */
162 val = show_bits(&s->gb, 16);
163 if(val)
164 return -1;
165
166 /* We have a GBSC probably with GSTUFF */
167 skip_bits(&s->gb, 16); /* Drop the zeros */
168 left= get_bits_left(&s->gb);
169 left = FFMIN(left, 32);
170 //MN: we must check the bits left or we might end in an infinite loop (or segfault)
171 for(;left>13; left--){
172 if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
173 }
174 if(left<=13)
175 return -1;
176
177 if(s->h263_slice_structured){
178 if(check_marker(s->avctx, &s->gb, "before MBA")==0)
179 return -1;
180
181 ff_h263_decode_mba(s);
182
183 if(s->mb_num > 1583)
184 if(check_marker(s->avctx, &s->gb, "after MBA")==0)
185 return -1;
186
187 s->qscale = get_bits(&s->gb, 5); /* SQUANT */
188 if(check_marker(s->avctx, &s->gb, "after SQUANT")==0)
189 return -1;
190 skip_bits(&s->gb, 2); /* GFID */
191 }else{
192 gob_number = get_bits(&s->gb, 5); /* GN */
193 s->mb_x= 0;
194 s->mb_y= s->gob_index* gob_number;
195 skip_bits(&s->gb, 2); /* GFID */
196 s->qscale = get_bits(&s->gb, 5); /* GQUANT */
197 }
198
199 if(s->mb_y >= s->mb_height)
200 return -1;
201
202 if(s->qscale==0)
203 return -1;
204
205 return 0;
206 }
207
208 /**
209 * Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
210 * @return bit position of the resync_marker, or <0 if none was found
211 */
ff_h263_resync(MpegEncContext * s)212 int ff_h263_resync(MpegEncContext *s){
213 int left, pos, ret;
214
215 /* In MPEG-4 studio mode look for a new slice startcode
216 * and decode slice header */
217 if(s->codec_id==AV_CODEC_ID_MPEG4 && s->studio_profile) {
218 align_get_bits(&s->gb);
219
220 while (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) != SLICE_START_CODE) {
221 get_bits(&s->gb, 8);
222 }
223
224 if (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) == SLICE_START_CODE)
225 return get_bits_count(&s->gb);
226 else
227 return -1;
228 }
229
230 if(s->codec_id==AV_CODEC_ID_MPEG4){
231 skip_bits1(&s->gb);
232 align_get_bits(&s->gb);
233 }
234
235 if(show_bits(&s->gb, 16)==0){
236 pos= get_bits_count(&s->gb);
237 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
238 ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
239 else
240 ret= h263_decode_gob_header(s);
241 if(ret>=0)
242 return pos;
243 }
244 //OK, it's not where it is supposed to be ...
245 s->gb= s->last_resync_gb;
246 align_get_bits(&s->gb);
247 left= get_bits_left(&s->gb);
248
249 for(;left>16+1+5+5; left-=8){
250 if(show_bits(&s->gb, 16)==0){
251 GetBitContext bak= s->gb;
252
253 pos= get_bits_count(&s->gb);
254 if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
255 ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
256 else
257 ret= h263_decode_gob_header(s);
258 if(ret>=0)
259 return pos;
260
261 s->gb= bak;
262 }
263 skip_bits(&s->gb, 8);
264 }
265
266 return -1;
267 }
268
ff_h263_decode_motion(MpegEncContext * s,int pred,int f_code)269 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
270 {
271 int code, val, sign, shift;
272 code = get_vlc2(&s->gb, ff_h263_mv_vlc.table, H263_MV_VLC_BITS, 2);
273
274 if (code == 0)
275 return pred;
276 if (code < 0)
277 return 0xffff;
278
279 sign = get_bits1(&s->gb);
280 shift = f_code - 1;
281 val = code;
282 if (shift) {
283 val = (val - 1) << shift;
284 val |= get_bits(&s->gb, shift);
285 val++;
286 }
287 if (sign)
288 val = -val;
289 val += pred;
290
291 /* modulo decoding */
292 if (!s->h263_long_vectors) {
293 val = sign_extend(val, 5 + f_code);
294 } else {
295 /* horrible H.263 long vector mode */
296 if (pred < -31 && val < -63)
297 val += 64;
298 if (pred > 32 && val > 63)
299 val -= 64;
300
301 }
302 return val;
303 }
304
305
306 /* Decode RVLC of H.263+ UMV */
h263p_decode_umotion(MpegEncContext * s,int pred)307 static int h263p_decode_umotion(MpegEncContext * s, int pred)
308 {
309 int code = 0, sign;
310
311 if (get_bits1(&s->gb)) /* Motion difference = 0 */
312 return pred;
313
314 code = 2 + get_bits1(&s->gb);
315
316 while (get_bits1(&s->gb))
317 {
318 code <<= 1;
319 code += get_bits1(&s->gb);
320 if (code >= 32768) {
321 avpriv_request_sample(s->avctx, "Huge DMV");
322 return 0xffff;
323 }
324 }
325 sign = code & 1;
326 code >>= 1;
327
328 code = (sign) ? (pred - code) : (pred + code);
329 ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
330 return code;
331
332 }
333
334 /**
335 * read the next MVs for OBMC. yes this is an ugly hack, feel free to send a patch :)
336 */
preview_obmc(MpegEncContext * s)337 static void preview_obmc(MpegEncContext *s){
338 GetBitContext gb= s->gb;
339
340 int cbpc, i, pred_x, pred_y, mx, my;
341 int16_t *mot_val;
342 const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
343 const int stride= s->b8_stride*2;
344
345 for(i=0; i<4; i++)
346 s->block_index[i]+= 2;
347 for(i=4; i<6; i++)
348 s->block_index[i]+= 1;
349 s->mb_x++;
350
351 av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
352
353 do{
354 if (get_bits1(&s->gb)) {
355 /* skip mb */
356 mot_val = s->current_picture.motion_val[0][s->block_index[0]];
357 mot_val[0 ]= mot_val[2 ]=
358 mot_val[0+stride]= mot_val[2+stride]= 0;
359 mot_val[1 ]= mot_val[3 ]=
360 mot_val[1+stride]= mot_val[3+stride]= 0;
361
362 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
363 goto end;
364 }
365 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
366 }while(cbpc == 20);
367
368 if(cbpc & 4){
369 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
370 }else{
371 get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
372 if (cbpc & 8) {
373 if(s->modified_quant){
374 if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
375 else skip_bits(&s->gb, 5);
376 }else
377 skip_bits(&s->gb, 2);
378 }
379
380 if ((cbpc & 16) == 0) {
381 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
382 /* 16x16 motion prediction */
383 mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
384 if (s->umvplus)
385 mx = h263p_decode_umotion(s, pred_x);
386 else
387 mx = ff_h263_decode_motion(s, pred_x, 1);
388
389 if (s->umvplus)
390 my = h263p_decode_umotion(s, pred_y);
391 else
392 my = ff_h263_decode_motion(s, pred_y, 1);
393
394 mot_val[0 ]= mot_val[2 ]=
395 mot_val[0+stride]= mot_val[2+stride]= mx;
396 mot_val[1 ]= mot_val[3 ]=
397 mot_val[1+stride]= mot_val[3+stride]= my;
398 } else {
399 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
400 for(i=0;i<4;i++) {
401 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
402 if (s->umvplus)
403 mx = h263p_decode_umotion(s, pred_x);
404 else
405 mx = ff_h263_decode_motion(s, pred_x, 1);
406
407 if (s->umvplus)
408 my = h263p_decode_umotion(s, pred_y);
409 else
410 my = ff_h263_decode_motion(s, pred_y, 1);
411 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
412 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
413 mot_val[0] = mx;
414 mot_val[1] = my;
415 }
416 }
417 }
418 end:
419
420 for(i=0; i<4; i++)
421 s->block_index[i]-= 2;
422 for(i=4; i<6; i++)
423 s->block_index[i]-= 1;
424 s->mb_x--;
425
426 s->gb= gb;
427 }
428
h263_decode_dquant(MpegEncContext * s)429 static void h263_decode_dquant(MpegEncContext *s){
430 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
431
432 if(s->modified_quant){
433 if(get_bits1(&s->gb))
434 s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
435 else
436 s->qscale= get_bits(&s->gb, 5);
437 }else
438 s->qscale += quant_tab[get_bits(&s->gb, 2)];
439 ff_set_qscale(s, s->qscale);
440 }
441
h263_decode_block(MpegEncContext * s,int16_t * block,int n,int coded)442 static int h263_decode_block(MpegEncContext * s, int16_t * block,
443 int n, int coded)
444 {
445 int level, i, j, run;
446 RLTable *rl = &ff_h263_rl_inter;
447 const uint8_t *scan_table;
448 GetBitContext gb= s->gb;
449
450 scan_table = s->intra_scantable.permutated;
451 if (s->h263_aic && s->mb_intra) {
452 rl = &ff_rl_intra_aic;
453 i = 0;
454 if (s->ac_pred) {
455 if (s->h263_aic_dir)
456 scan_table = s->intra_v_scantable.permutated; /* left */
457 else
458 scan_table = s->intra_h_scantable.permutated; /* top */
459 }
460 } else if (s->mb_intra) {
461 /* DC coef */
462 if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
463 if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
464 int component, diff;
465 component = (n <= 3 ? 0 : n - 4 + 1);
466 level = s->last_dc[component];
467 if (s->rv10_first_dc_coded[component]) {
468 diff = ff_rv_decode_dc(s, n);
469 if (diff < 0)
470 return -1;
471 level += diff;
472 level = level & 0xff; /* handle wrap round */
473 s->last_dc[component] = level;
474 } else {
475 s->rv10_first_dc_coded[component] = 1;
476 }
477 } else {
478 level = get_bits(&s->gb, 8);
479 if (level == 255)
480 level = 128;
481 }
482 }else{
483 level = get_bits(&s->gb, 8);
484 if((level&0x7F) == 0){
485 av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
486 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
487 return -1;
488 }
489 if (level == 255)
490 level = 128;
491 }
492 block[0] = level;
493 i = 1;
494 } else {
495 i = 0;
496 }
497 if (!coded) {
498 if (s->mb_intra && s->h263_aic)
499 goto not_coded;
500 s->block_last_index[n] = i - 1;
501 return 0;
502 }
503 retry:
504 {
505 OPEN_READER(re, &s->gb);
506 i--; // offset by -1 to allow direct indexing of scan_table
507 for(;;) {
508 UPDATE_CACHE(re, &s->gb);
509 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
510 if (run == 66) {
511 if (level){
512 CLOSE_READER(re, &s->gb);
513 av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
514 return -1;
515 }
516 /* escape */
517 if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
518 int is11 = SHOW_UBITS(re, &s->gb, 1);
519 SKIP_CACHE(re, &s->gb, 1);
520 run = SHOW_UBITS(re, &s->gb, 7) + 1;
521 if (is11) {
522 SKIP_COUNTER(re, &s->gb, 1 + 7);
523 UPDATE_CACHE(re, &s->gb);
524 level = SHOW_SBITS(re, &s->gb, 11);
525 SKIP_COUNTER(re, &s->gb, 11);
526 } else {
527 SKIP_CACHE(re, &s->gb, 7);
528 level = SHOW_SBITS(re, &s->gb, 7);
529 SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
530 }
531 } else {
532 run = SHOW_UBITS(re, &s->gb, 7) + 1;
533 SKIP_CACHE(re, &s->gb, 7);
534 level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
535 SKIP_COUNTER(re, &s->gb, 7 + 8);
536 if(level == -128){
537 UPDATE_CACHE(re, &s->gb);
538 if (s->codec_id == AV_CODEC_ID_RV10) {
539 /* XXX: should patch encoder too */
540 level = SHOW_SBITS(re, &s->gb, 12);
541 SKIP_COUNTER(re, &s->gb, 12);
542 }else{
543 level = SHOW_UBITS(re, &s->gb, 5);
544 SKIP_CACHE(re, &s->gb, 5);
545 level |= SHOW_SBITS(re, &s->gb, 6) * (1<<5);
546 SKIP_COUNTER(re, &s->gb, 5 + 6);
547 }
548 }
549 }
550 } else {
551 if (SHOW_UBITS(re, &s->gb, 1))
552 level = -level;
553 SKIP_COUNTER(re, &s->gb, 1);
554 }
555 i += run;
556 if (i >= 64){
557 CLOSE_READER(re, &s->gb);
558 // redo update without last flag, revert -1 offset
559 i = i - run + ((run-1)&63) + 1;
560 if (i < 64) {
561 // only last marker, no overrun
562 block[scan_table[i]] = level;
563 break;
564 }
565 if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
566 //Looks like a hack but no, it's the way it is supposed to work ...
567 rl = &ff_rl_intra_aic;
568 i = 0;
569 s->gb= gb;
570 s->bdsp.clear_block(block);
571 goto retry;
572 }
573 av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
574 return -1;
575 }
576 j = scan_table[i];
577 block[j] = level;
578 }
579 }
580 not_coded:
581 if (s->mb_intra && s->h263_aic) {
582 ff_h263_pred_acdc(s, block, n);
583 i = 63;
584 }
585 s->block_last_index[n] = i;
586 return 0;
587 }
588
h263_skip_b_part(MpegEncContext * s,int cbp)589 static int h263_skip_b_part(MpegEncContext *s, int cbp)
590 {
591 LOCAL_ALIGNED_32(int16_t, dblock, [64]);
592 int i, mbi;
593 int bli[6];
594
595 /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
596 * but real value should be restored in order to be used later (in OBMC condition)
597 */
598 mbi = s->mb_intra;
599 memcpy(bli, s->block_last_index, sizeof(bli));
600 s->mb_intra = 0;
601 for (i = 0; i < 6; i++) {
602 if (h263_decode_block(s, dblock, i, cbp&32) < 0)
603 return -1;
604 cbp+=cbp;
605 }
606 s->mb_intra = mbi;
607 memcpy(s->block_last_index, bli, sizeof(bli));
608 return 0;
609 }
610
h263_get_modb(GetBitContext * gb,int pb_frame,int * cbpb)611 static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
612 {
613 int c, mv = 1;
614
615 if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
616 c = get_bits1(gb);
617 if (pb_frame == 2 && c)
618 mv = !get_bits1(gb);
619 } else { // h.263 Annex M improved PB-frame
620 mv = get_unary(gb, 0, 4) + 1;
621 c = mv & 1;
622 mv = !!(mv & 2);
623 }
624 if(c)
625 *cbpb = get_bits(gb, 6);
626 return mv;
627 }
628
629 #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
630 #define tab_bias (tab_size / 2)
set_one_direct_mv(MpegEncContext * s,Picture * p,int i)631 static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
632 {
633 int xy = s->block_index[i];
634 uint16_t time_pp = s->pp_time;
635 uint16_t time_pb = s->pb_time;
636 int p_mx, p_my;
637
638 p_mx = p->motion_val[0][xy][0];
639 if ((unsigned)(p_mx + tab_bias) < tab_size) {
640 s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
641 s->mv[1][i][0] = s->direct_scale_mv[1][p_mx + tab_bias];
642 } else {
643 s->mv[0][i][0] = p_mx * time_pb / time_pp;
644 s->mv[1][i][0] = p_mx * (time_pb - time_pp) / time_pp;
645 }
646 p_my = p->motion_val[0][xy][1];
647 if ((unsigned)(p_my + tab_bias) < tab_size) {
648 s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
649 s->mv[1][i][1] = s->direct_scale_mv[1][p_my + tab_bias];
650 } else {
651 s->mv[0][i][1] = p_my * time_pb / time_pp;
652 s->mv[1][i][1] = p_my * (time_pb - time_pp) / time_pp;
653 }
654 }
655
656 /**
657 * @return the mb_type
658 */
set_direct_mv(MpegEncContext * s)659 static int set_direct_mv(MpegEncContext *s)
660 {
661 const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
662 Picture *p = &s->next_picture;
663 int colocated_mb_type = p->mb_type[mb_index];
664 int i;
665
666 if (s->codec_tag == AV_RL32("U263") && p->f->pict_type == AV_PICTURE_TYPE_I) {
667 p = &s->last_picture;
668 colocated_mb_type = p->mb_type[mb_index];
669 }
670
671 if (IS_8X8(colocated_mb_type)) {
672 s->mv_type = MV_TYPE_8X8;
673 for (i = 0; i < 4; i++)
674 set_one_direct_mv(s, p, i);
675 return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
676 } else {
677 set_one_direct_mv(s, p, 0);
678 s->mv[0][1][0] =
679 s->mv[0][2][0] =
680 s->mv[0][3][0] = s->mv[0][0][0];
681 s->mv[0][1][1] =
682 s->mv[0][2][1] =
683 s->mv[0][3][1] = s->mv[0][0][1];
684 s->mv[1][1][0] =
685 s->mv[1][2][0] =
686 s->mv[1][3][0] = s->mv[1][0][0];
687 s->mv[1][1][1] =
688 s->mv[1][2][1] =
689 s->mv[1][3][1] = s->mv[1][0][1];
690 s->mv_type = MV_TYPE_8X8;
691 // Note see prev line
692 return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
693 }
694 }
695
ff_h263_decode_mb(MpegEncContext * s,int16_t block[6][64])696 int ff_h263_decode_mb(MpegEncContext *s,
697 int16_t block[6][64])
698 {
699 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
700 int16_t *mot_val;
701 const int xy= s->mb_x + s->mb_y * s->mb_stride;
702 int cbpb = 0, pb_mv_count = 0;
703
704 av_assert2(!s->h263_pred);
705
706 if (s->pict_type == AV_PICTURE_TYPE_P) {
707 do{
708 if (get_bits1(&s->gb)) {
709 /* skip mb */
710 s->mb_intra = 0;
711 for(i=0;i<6;i++)
712 s->block_last_index[i] = -1;
713 s->mv_dir = MV_DIR_FORWARD;
714 s->mv_type = MV_TYPE_16X16;
715 s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
716 s->mv[0][0][0] = 0;
717 s->mv[0][0][1] = 0;
718 s->mb_skipped = !(s->obmc | s->loop_filter);
719 goto end;
720 }
721 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
722 if (cbpc < 0){
723 av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
724 return SLICE_ERROR;
725 }
726 }while(cbpc == 20);
727
728 s->bdsp.clear_blocks(s->block[0]);
729
730 dquant = cbpc & 8;
731 s->mb_intra = ((cbpc & 4) != 0);
732 if (s->mb_intra) goto intra;
733
734 if(s->pb_frame && get_bits1(&s->gb))
735 pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
736 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
737
738 if (cbpy < 0) {
739 av_log(s->avctx, AV_LOG_ERROR, "cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
740 return SLICE_ERROR;
741 }
742
743 if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
744 cbpy ^= 0xF;
745
746 cbp = (cbpc & 3) | (cbpy << 2);
747 if (dquant) {
748 h263_decode_dquant(s);
749 }
750
751 s->mv_dir = MV_DIR_FORWARD;
752 if ((cbpc & 16) == 0) {
753 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
754 /* 16x16 motion prediction */
755 s->mv_type = MV_TYPE_16X16;
756 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
757 if (s->umvplus)
758 mx = h263p_decode_umotion(s, pred_x);
759 else
760 mx = ff_h263_decode_motion(s, pred_x, 1);
761
762 if (mx >= 0xffff)
763 return SLICE_ERROR;
764
765 if (s->umvplus)
766 my = h263p_decode_umotion(s, pred_y);
767 else
768 my = ff_h263_decode_motion(s, pred_y, 1);
769
770 if (my >= 0xffff)
771 return SLICE_ERROR;
772 s->mv[0][0][0] = mx;
773 s->mv[0][0][1] = my;
774
775 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
776 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
777 } else {
778 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
779 s->mv_type = MV_TYPE_8X8;
780 for(i=0;i<4;i++) {
781 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
782 if (s->umvplus)
783 mx = h263p_decode_umotion(s, pred_x);
784 else
785 mx = ff_h263_decode_motion(s, pred_x, 1);
786 if (mx >= 0xffff)
787 return SLICE_ERROR;
788
789 if (s->umvplus)
790 my = h263p_decode_umotion(s, pred_y);
791 else
792 my = ff_h263_decode_motion(s, pred_y, 1);
793 if (my >= 0xffff)
794 return SLICE_ERROR;
795 s->mv[0][i][0] = mx;
796 s->mv[0][i][1] = my;
797 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
798 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
799 mot_val[0] = mx;
800 mot_val[1] = my;
801 }
802 }
803 } else if(s->pict_type==AV_PICTURE_TYPE_B) {
804 int mb_type;
805 const int stride= s->b8_stride;
806 int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
807 int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
808 // const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
809
810 //FIXME ugly
811 mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
812 mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
813 mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
814 mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
815
816 do{
817 mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
818 if (mb_type < 0){
819 av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
820 return SLICE_ERROR;
821 }
822
823 mb_type= h263_mb_type_b_map[ mb_type ];
824 }while(!mb_type);
825
826 s->mb_intra = IS_INTRA(mb_type);
827 if(HAS_CBP(mb_type)){
828 s->bdsp.clear_blocks(s->block[0]);
829 cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
830 if(s->mb_intra){
831 dquant = IS_QUANT(mb_type);
832 goto intra;
833 }
834
835 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
836
837 if (cbpy < 0){
838 av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
839 return SLICE_ERROR;
840 }
841
842 if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
843 cbpy ^= 0xF;
844
845 cbp = (cbpc & 3) | (cbpy << 2);
846 }else
847 cbp=0;
848
849 av_assert2(!s->mb_intra);
850
851 if(IS_QUANT(mb_type)){
852 h263_decode_dquant(s);
853 }
854
855 if(IS_DIRECT(mb_type)){
856 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
857 mb_type |= set_direct_mv(s);
858 }else{
859 s->mv_dir = 0;
860 s->mv_type= MV_TYPE_16X16;
861 //FIXME UMV
862
863 if(USES_LIST(mb_type, 0)){
864 int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
865 s->mv_dir = MV_DIR_FORWARD;
866
867 if (s->umvplus)
868 mx = h263p_decode_umotion(s, pred_x);
869 else
870 mx = ff_h263_decode_motion(s, pred_x, 1);
871 if (mx >= 0xffff)
872 return SLICE_ERROR;
873
874 if (s->umvplus)
875 my = h263p_decode_umotion(s, pred_y);
876 else
877 my = ff_h263_decode_motion(s, pred_y, 1);
878 if (my >= 0xffff)
879 return SLICE_ERROR;
880
881 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
882 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
883
884 s->mv[0][0][0] = mx;
885 s->mv[0][0][1] = my;
886 mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
887 mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
888 }
889
890 if(USES_LIST(mb_type, 1)){
891 int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
892 s->mv_dir |= MV_DIR_BACKWARD;
893
894 if (s->umvplus)
895 mx = h263p_decode_umotion(s, pred_x);
896 else
897 mx = ff_h263_decode_motion(s, pred_x, 1);
898 if (mx >= 0xffff)
899 return SLICE_ERROR;
900
901 if (s->umvplus)
902 my = h263p_decode_umotion(s, pred_y);
903 else
904 my = ff_h263_decode_motion(s, pred_y, 1);
905 if (my >= 0xffff)
906 return SLICE_ERROR;
907
908 if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
909 skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
910
911 s->mv[1][0][0] = mx;
912 s->mv[1][0][1] = my;
913 mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
914 mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
915 }
916 }
917
918 s->current_picture.mb_type[xy] = mb_type;
919 } else { /* I-Frame */
920 do{
921 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
922 if (cbpc < 0){
923 av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
924 return SLICE_ERROR;
925 }
926 }while(cbpc == 8);
927
928 s->bdsp.clear_blocks(s->block[0]);
929
930 dquant = cbpc & 4;
931 s->mb_intra = 1;
932 intra:
933 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
934 if (s->h263_aic) {
935 s->ac_pred = get_bits1(&s->gb);
936 if(s->ac_pred){
937 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
938
939 s->h263_aic_dir = get_bits1(&s->gb);
940 }
941 }else
942 s->ac_pred = 0;
943
944 if(s->pb_frame && get_bits1(&s->gb))
945 pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
946 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
947 if(cbpy<0){
948 av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
949 return SLICE_ERROR;
950 }
951 cbp = (cbpc & 3) | (cbpy << 2);
952 if (dquant) {
953 h263_decode_dquant(s);
954 }
955
956 pb_mv_count += !!s->pb_frame;
957 }
958
959 while(pb_mv_count--){
960 ff_h263_decode_motion(s, 0, 1);
961 ff_h263_decode_motion(s, 0, 1);
962 }
963
964 /* decode each block */
965 for (i = 0; i < 6; i++) {
966 if (h263_decode_block(s, block[i], i, cbp&32) < 0)
967 return -1;
968 cbp+=cbp;
969 }
970
971 if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
972 return -1;
973 if(s->obmc && !s->mb_intra){
974 if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
975 preview_obmc(s);
976 }
977 end:
978
979 if (get_bits_left(&s->gb) < 0)
980 return AVERROR_INVALIDDATA;
981
982 /* per-MB end of slice check */
983 {
984 int v= show_bits(&s->gb, 16);
985
986 if (get_bits_left(&s->gb) < 16) {
987 v >>= 16 - get_bits_left(&s->gb);
988 }
989
990 if(v==0)
991 return SLICE_END;
992 }
993
994 return SLICE_OK;
995 }
996
997 /* Most is hardcoded; should extend to handle all H.263 streams. */
ff_h263_decode_picture_header(MpegEncContext * s)998 int ff_h263_decode_picture_header(MpegEncContext *s)
999 {
1000 int format, width, height, i, ret;
1001 uint32_t startcode;
1002
1003 align_get_bits(&s->gb);
1004
1005 if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
1006 av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
1007 }
1008
1009 startcode= get_bits(&s->gb, 22-8);
1010
1011 for(i= get_bits_left(&s->gb); i>24; i-=8) {
1012 startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
1013
1014 if(startcode == 0x20)
1015 break;
1016 }
1017
1018 if (startcode != 0x20) {
1019 av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
1020 return -1;
1021 }
1022 /* temporal reference */
1023 i = get_bits(&s->gb, 8); /* picture timestamp */
1024
1025 i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
1026
1027 s->picture_number= (s->picture_number&~0xFF) + i;
1028
1029 /* PTYPE starts here */
1030 if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
1031 return -1;
1032 }
1033 if (get_bits1(&s->gb) != 0) {
1034 av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
1035 return -1; /* H.263 id */
1036 }
1037 skip_bits1(&s->gb); /* split screen off */
1038 skip_bits1(&s->gb); /* camera off */
1039 skip_bits1(&s->gb); /* freeze picture release off */
1040
1041 format = get_bits(&s->gb, 3);
1042 /*
1043 0 forbidden
1044 1 sub-QCIF
1045 10 QCIF
1046 7 extended PTYPE (PLUSPTYPE)
1047 */
1048
1049 if (format != 7 && format != 6) {
1050 s->h263_plus = 0;
1051 /* H.263v1 */
1052 width = ff_h263_format[format][0];
1053 height = ff_h263_format[format][1];
1054 if (!width)
1055 return -1;
1056
1057 s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
1058
1059 s->h263_long_vectors = get_bits1(&s->gb);
1060
1061 if (get_bits1(&s->gb) != 0) {
1062 av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
1063 return -1; /* SAC: off */
1064 }
1065 s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1066 s->unrestricted_mv = s->h263_long_vectors || s->obmc;
1067
1068 s->pb_frame = get_bits1(&s->gb);
1069 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
1070 skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
1071
1072 s->width = width;
1073 s->height = height;
1074 s->avctx->sample_aspect_ratio= (AVRational){12,11};
1075 s->avctx->framerate = (AVRational){ 30000, 1001 };
1076 } else {
1077 int ufep;
1078
1079 /* H.263v2 */
1080 s->h263_plus = 1;
1081 ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
1082
1083 /* ufep other than 0 and 1 are reserved */
1084 if (ufep == 1) {
1085 /* OPPTYPE */
1086 format = get_bits(&s->gb, 3);
1087 ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
1088 s->custom_pcf= get_bits1(&s->gb);
1089 s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
1090 if (get_bits1(&s->gb) != 0) {
1091 av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
1092 }
1093 s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1094 s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
1095 s->loop_filter= get_bits1(&s->gb);
1096 s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
1097 if(s->avctx->lowres)
1098 s->loop_filter = 0;
1099
1100 s->h263_slice_structured= get_bits1(&s->gb);
1101 if (get_bits1(&s->gb) != 0) {
1102 av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
1103 }
1104 if (get_bits1(&s->gb) != 0) {
1105 av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
1106 }
1107 s->alt_inter_vlc= get_bits1(&s->gb);
1108 s->modified_quant= get_bits1(&s->gb);
1109 if(s->modified_quant)
1110 s->chroma_qscale_table= ff_h263_chroma_qscale_table;
1111
1112 skip_bits(&s->gb, 1); /* Prevent start code emulation */
1113
1114 skip_bits(&s->gb, 3); /* Reserved */
1115 } else if (ufep != 0) {
1116 av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
1117 return -1;
1118 }
1119
1120 /* MPPTYPE */
1121 s->pict_type = get_bits(&s->gb, 3);
1122 switch(s->pict_type){
1123 case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
1124 case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
1125 case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
1126 case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
1127 case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
1128 default:
1129 return -1;
1130 }
1131 skip_bits(&s->gb, 2);
1132 s->no_rounding = get_bits1(&s->gb);
1133 skip_bits(&s->gb, 4);
1134
1135 /* Get the picture dimensions */
1136 if (ufep) {
1137 if (format == 6) {
1138 /* Custom Picture Format (CPFMT) */
1139 s->aspect_ratio_info = get_bits(&s->gb, 4);
1140 ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1141 /* aspect ratios:
1142 0 - forbidden
1143 1 - 1:1
1144 2 - 12:11 (CIF 4:3)
1145 3 - 10:11 (525-type 4:3)
1146 4 - 16:11 (CIF 16:9)
1147 5 - 40:33 (525-type 16:9)
1148 6-14 - reserved
1149 */
1150 width = (get_bits(&s->gb, 9) + 1) * 4;
1151 check_marker(s->avctx, &s->gb, "in dimensions");
1152 height = get_bits(&s->gb, 9) * 4;
1153 ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1154 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1155 /* expected dimensions */
1156 s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1157 s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1158 }else{
1159 s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1160 }
1161 } else {
1162 width = ff_h263_format[format][0];
1163 height = ff_h263_format[format][1];
1164 s->avctx->sample_aspect_ratio= (AVRational){12,11};
1165 }
1166 s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
1167 if ((width == 0) || (height == 0))
1168 return -1;
1169 s->width = width;
1170 s->height = height;
1171
1172 if(s->custom_pcf){
1173 int gcd;
1174 s->avctx->framerate.num = 1800000;
1175 s->avctx->framerate.den = 1000 + get_bits1(&s->gb);
1176 s->avctx->framerate.den *= get_bits(&s->gb, 7);
1177 if(s->avctx->framerate.den == 0){
1178 av_log(s, AV_LOG_ERROR, "zero framerate\n");
1179 return -1;
1180 }
1181 gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1182 s->avctx->framerate.den /= gcd;
1183 s->avctx->framerate.num /= gcd;
1184 }else{
1185 s->avctx->framerate = (AVRational){ 30000, 1001 };
1186 }
1187 }
1188
1189 if(s->custom_pcf){
1190 skip_bits(&s->gb, 2); //extended Temporal reference
1191 }
1192
1193 if (ufep) {
1194 if (s->umvplus) {
1195 if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1196 skip_bits1(&s->gb);
1197 }
1198 if(s->h263_slice_structured){
1199 if (get_bits1(&s->gb) != 0) {
1200 av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1201 }
1202 if (get_bits1(&s->gb) != 0) {
1203 av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1204 }
1205 }
1206 if (s->pict_type == AV_PICTURE_TYPE_B) {
1207 skip_bits(&s->gb, 4); //ELNUM
1208 if (ufep == 1) {
1209 skip_bits(&s->gb, 4); // RLNUM
1210 }
1211 }
1212 }
1213
1214 s->qscale = get_bits(&s->gb, 5);
1215 }
1216
1217 if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1218 return ret;
1219
1220 if (!(s->avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1221 if ((s->width * s->height / 256 / 8) > get_bits_left(&s->gb))
1222 return AVERROR_INVALIDDATA;
1223 }
1224
1225 s->mb_width = (s->width + 15) / 16;
1226 s->mb_height = (s->height + 15) / 16;
1227 s->mb_num = s->mb_width * s->mb_height;
1228
1229 if (s->pb_frame) {
1230 skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1231 if (s->custom_pcf)
1232 skip_bits(&s->gb, 2); //extended Temporal reference
1233 skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1234 }
1235
1236 if (s->pict_type!=AV_PICTURE_TYPE_B) {
1237 s->time = s->picture_number;
1238 s->pp_time = s->time - s->last_non_b_time;
1239 s->last_non_b_time = s->time;
1240 }else{
1241 s->time = s->picture_number;
1242 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1243 if (s->pp_time <=s->pb_time ||
1244 s->pp_time <= s->pp_time - s->pb_time ||
1245 s->pp_time <= 0){
1246 s->pp_time = 2;
1247 s->pb_time = 1;
1248 }
1249 ff_mpeg4_init_direct_mv(s);
1250 }
1251
1252 /* PEI */
1253 if (skip_1stop_8data_bits(&s->gb) < 0)
1254 return AVERROR_INVALIDDATA;
1255
1256 if(s->h263_slice_structured){
1257 if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
1258 return -1;
1259 }
1260
1261 ff_h263_decode_mba(s);
1262
1263 if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
1264 return -1;
1265 }
1266 }
1267 s->f_code = 1;
1268
1269 if (s->pict_type == AV_PICTURE_TYPE_B)
1270 s->low_delay = 0;
1271
1272 if(s->h263_aic){
1273 s->y_dc_scale_table=
1274 s->c_dc_scale_table= ff_aic_dc_scale_table;
1275 }else{
1276 s->y_dc_scale_table=
1277 s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
1278 }
1279
1280 ff_h263_show_pict_info(s);
1281 if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
1282 int i,j;
1283 for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1284 av_log(s->avctx, AV_LOG_DEBUG, "\n");
1285 for(i=0; i<13; i++){
1286 for(j=0; j<3; j++){
1287 int v= get_bits(&s->gb, 8);
1288 v |= get_sbits(&s->gb, 8) * (1 << 8);
1289 av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1290 }
1291 av_log(s->avctx, AV_LOG_DEBUG, "\n");
1292 }
1293 for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1294 }
1295
1296 return 0;
1297 }
1298