GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/ituh263dec.c Lines: 512 757 67.6 %
Date: 2021-04-20 15:25:36 Branches: 253 514 49.2 %

Line Branch Exec Source
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
76
461
void ff_h263_show_pict_info(MpegEncContext *s){
77
461
    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
461
}
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 */
108
303
av_cold void ff_h263_decode_init_vlc(void)
109
{
110
    static volatile int done = 0;
111
112
303
    if (!done) {
113
172
        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
172
        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
172
        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
172
        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
172
        ff_h263_init_rl_inter();
126

5676
        INIT_VLC_RL(ff_h263_rl_inter, 554);
127
172
        INIT_FIRST_VLC_RL(ff_rl_intra_aic, 554);
128
172
        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
172
        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
172
        done = 1;
135
    }
136
303
}
137
138
742
int ff_h263_decode_mba(MpegEncContext *s)
139
{
140
    int i, mb_pos;
141
142
2226
    for (i = 0; i < 6; i++)
143
2226
        if (s->mb_num - 1 <= ff_mba_max[i])
144
742
            break;
145
742
    mb_pos  = get_bits(&s->gb, ff_mba_length[i]);
146
742
    s->mb_x = mb_pos % s->mb_width;
147
742
    s->mb_y = mb_pos / s->mb_width;
148
149
742
    return mb_pos;
150
}
151
152
/**
153
 * Decode the group of blocks header or slice header.
154
 * @return <0 if an error occurred
155
 */
156
2544
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
2544
    val = show_bits(&s->gb, 16);
163
2544
    if(val)
164
        return -1;
165
166
        /* We have a GBSC probably with GSTUFF */
167
2544
    skip_bits(&s->gb, 16); /* Drop the zeros */
168
2544
    left= get_bits_left(&s->gb);
169
2544
    left = FFMIN(left, 32);
170
    //MN: we must check the bits left or we might end in an infinite loop (or segfault)
171
11538
    for(;left>13; left--){
172
11538
        if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
173
    }
174
2544
    if(left<=13)
175
        return -1;
176
177
2544
    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
2544
        gob_number = get_bits(&s->gb, 5); /* GN */
193
2544
        s->mb_x= 0;
194
2544
        s->mb_y= s->gob_index* gob_number;
195
2544
        skip_bits(&s->gb, 2); /* GFID */
196
2544
        s->qscale = get_bits(&s->gb, 5); /* GQUANT */
197
    }
198
199
2544
    if(s->mb_y >= s->mb_height)
200
        return -1;
201
202
2544
    if(s->qscale==0)
203
        return -1;
204
205
2544
    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
 */
212
6411
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

6411
    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
6411
    if(s->codec_id==AV_CODEC_ID_MPEG4){
231
3867
        skip_bits1(&s->gb);
232
3867
        align_get_bits(&s->gb);
233
    }
234
235
6411
    if(show_bits(&s->gb, 16)==0){
236
6411
        pos= get_bits_count(&s->gb);
237
6411
        if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
238
3867
            ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
239
        else
240
2544
            ret= h263_decode_gob_header(s);
241
6411
        if(ret>=0)
242
6411
            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
269
3734438
int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
270
{
271
    int code, val, sign, shift;
272
3734438
    code = get_vlc2(&s->gb, ff_h263_mv_vlc.table, H263_MV_VLC_BITS, 2);
273
274
3734438
    if (code == 0)
275
1837968
        return pred;
276
1896470
    if (code < 0)
277
        return 0xffff;
278
279
1896470
    sign = get_bits1(&s->gb);
280
1896470
    shift = f_code - 1;
281
1896470
    val = code;
282
1896470
    if (shift) {
283
222315
        val = (val - 1) << shift;
284
222315
        val |= get_bits(&s->gb, shift);
285
222315
        val++;
286
    }
287
1896470
    if (sign)
288
791305
        val = -val;
289
1896470
    val += pred;
290
291
    /* modulo decoding */
292
1896470
    if (!s->h263_long_vectors) {
293
1896470
        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
1896470
    return val;
303
}
304
305
306
/* Decode RVLC of H.263+ UMV */
307
103298
static int h263p_decode_umotion(MpegEncContext * s, int pred)
308
{
309
103298
   int code = 0, sign;
310
311
103298
   if (get_bits1(&s->gb)) /* Motion difference = 0 */
312
51255
      return pred;
313
314
52043
   code = 2 + get_bits1(&s->gb);
315
316
80802
   while (get_bits1(&s->gb))
317
   {
318
28759
      code <<= 1;
319
28759
      code += get_bits1(&s->gb);
320
28759
      if (code >= 32768) {
321
          avpriv_request_sample(s->avctx, "Huge DMV");
322
          return 0xffff;
323
      }
324
   }
325
52043
   sign = code & 1;
326
52043
   code >>= 1;
327
328
52043
   code = (sign) ? (pred - code) : (pred + code);
329
   ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
330
52043
   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
 */
337
48550
static void preview_obmc(MpegEncContext *s){
338
48550
    GetBitContext gb= s->gb;
339
340
    int cbpc, i, pred_x, pred_y, mx, my;
341
    int16_t *mot_val;
342
48550
    const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
343
48550
    const int stride= s->b8_stride*2;
344
345
242750
    for(i=0; i<4; i++)
346
194200
        s->block_index[i]+= 2;
347
145650
    for(i=4; i<6; i++)
348
97100
        s->block_index[i]+= 1;
349
48550
    s->mb_x++;
350
351
    av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
352
353
    do{
354
48550
        if (get_bits1(&s->gb)) {
355
            /* skip mb */
356
654
            mot_val = s->current_picture.motion_val[0][s->block_index[0]];
357
654
            mot_val[0       ]= mot_val[2       ]=
358
654
            mot_val[0+stride]= mot_val[2+stride]= 0;
359
654
            mot_val[1       ]= mot_val[3       ]=
360
654
            mot_val[1+stride]= mot_val[3+stride]= 0;
361
362
654
            s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
363
654
            goto end;
364
        }
365
47896
        cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
366
47896
    }while(cbpc == 20);
367
368
47896
    if(cbpc & 4){
369
957
        s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
370
    }else{
371
46939
        get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
372
46939
        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
46939
        if ((cbpc & 16) == 0) {
381
46939
                s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
382
                /* 16x16 motion prediction */
383
46939
                mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
384
46939
                if (s->umvplus)
385
                    mx = h263p_decode_umotion(s, pred_x);
386
                else
387
46939
                    mx = ff_h263_decode_motion(s, pred_x, 1);
388
389
46939
                if (s->umvplus)
390
                    my = h263p_decode_umotion(s, pred_y);
391
                else
392
46939
                    my = ff_h263_decode_motion(s, pred_y, 1);
393
394
46939
                mot_val[0       ]= mot_val[2       ]=
395
46939
                mot_val[0+stride]= mot_val[2+stride]= mx;
396
46939
                mot_val[1       ]= mot_val[3       ]=
397
46939
                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
242750
    for(i=0; i<4; i++)
421
194200
        s->block_index[i]-= 2;
422
145650
    for(i=4; i<6; i++)
423
97100
        s->block_index[i]-= 1;
424
48550
    s->mb_x--;
425
426
48550
    s->gb= gb;
427
48550
}
428
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
442
2590998
static int h263_decode_block(MpegEncContext * s, int16_t * block,
443
                             int n, int coded)
444
{
445
    int level, i, j, run;
446
2590998
    RLTable *rl = &ff_h263_rl_inter;
447
    const uint8_t *scan_table;
448
2590998
    GetBitContext gb= s->gb;
449
450
2590998
    scan_table = s->intra_scantable.permutated;
451

2590998
    if (s->h263_aic && s->mb_intra) {
452
91098
        rl = &ff_rl_intra_aic;
453
91098
        i = 0;
454
91098
        if (s->ac_pred) {
455
4434
            if (s->h263_aic_dir)
456
1596
                scan_table = s->intra_v_scantable.permutated; /* left */
457
            else
458
2838
                scan_table = s->intra_h_scantable.permutated; /* top */
459
        }
460
2499900
    } else if (s->mb_intra) {
461
        /* DC coef */
462
300744
        if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
463

46710
          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
46710
                level = get_bits(&s->gb, 8);
479
46710
                if (level == 255)
480
542
                    level = 128;
481
          }
482
        }else{
483
254034
            level = get_bits(&s->gb, 8);
484
254034
            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
254034
            if (level == 255)
490
3049
                level = 128;
491
        }
492
300744
        block[0] = level;
493
300744
        i = 1;
494
    } else {
495
2199156
        i = 0;
496
    }
497
2590998
    if (!coded) {
498

1245242
        if (s->mb_intra && s->h263_aic)
499
3823
            goto not_coded;
500
1241419
        s->block_last_index[n] = i - 1;
501
1241419
        return 0;
502
    }
503
1345756
retry:
504
    {
505
1412215
    OPEN_READER(re, &s->gb);
506
1412215
    i--; // offset by -1 to allow direct indexing of scan_table
507
    for(;;) {
508
14050943
        UPDATE_CACHE(re, &s->gb);
509
14050943
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
510
14050943
        if (run == 66) {
511
587695
            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
587695
            if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
518
117640
                int is11 = SHOW_UBITS(re, &s->gb, 1);
519
117640
                SKIP_CACHE(re, &s->gb, 1);
520
117640
                run = SHOW_UBITS(re, &s->gb, 7) + 1;
521
117640
                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
117640
                    SKIP_CACHE(re, &s->gb, 7);
528
117640
                    level = SHOW_SBITS(re, &s->gb, 7);
529
117640
                    SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
530
                }
531
            } else {
532
470055
                run = SHOW_UBITS(re, &s->gb, 7) + 1;
533
470055
                SKIP_CACHE(re, &s->gb, 7);
534
470055
                level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
535
470055
                SKIP_COUNTER(re, &s->gb, 7 + 8);
536
470055
                if(level == -128){
537
3157
                    UPDATE_CACHE(re, &s->gb);
538
3157
                    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
3157
                        level = SHOW_UBITS(re, &s->gb, 5);
544
3157
                        SKIP_CACHE(re, &s->gb, 5);
545
3157
                        level |= SHOW_SBITS(re, &s->gb, 6) * (1<<5);
546
3157
                        SKIP_COUNTER(re, &s->gb, 5 + 6);
547
                    }
548
                }
549
            }
550
        } else {
551
13463248
            if (SHOW_UBITS(re, &s->gb, 1))
552
6708475
                level = -level;
553
13463248
            SKIP_COUNTER(re, &s->gb, 1);
554
        }
555
14050943
        i += run;
556
14050943
        if (i >= 64){
557
1412215
            CLOSE_READER(re, &s->gb);
558
            // redo update without last flag, revert -1 offset
559
1412215
            i = i - run + ((run-1)&63) + 1;
560
1412215
            if (i < 64) {
561
                // only last marker, no overrun
562
1345756
                block[scan_table[i]] = level;
563
1345756
                break;
564
            }
565

66459
            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
66459
                rl = &ff_rl_intra_aic;
568
66459
                i = 0;
569
66459
                s->gb= gb;
570
66459
                s->bdsp.clear_block(block);
571
66459
                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
12638728
        j = scan_table[i];
577
12638728
        block[j] = level;
578
    }
579
    }
580
1349579
not_coded:
581

1349579
    if (s->mb_intra && s->h263_aic) {
582
91098
        ff_h263_pred_acdc(s, block, n);
583
91098
        i = 63;
584
    }
585
1349579
    s->block_last_index[n] = i;
586
1349579
    return 0;
587
}
588
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
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)
631
15407
static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
632
{
633
15407
    int xy           = s->block_index[i];
634
15407
    uint16_t time_pp = s->pp_time;
635
15407
    uint16_t time_pb = s->pb_time;
636
    int p_mx, p_my;
637
638
15407
    p_mx = p->motion_val[0][xy][0];
639
15407
    if ((unsigned)(p_mx + tab_bias) < tab_size) {
640
15407
        s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
641
15407
        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
15407
    p_my = p->motion_val[0][xy][1];
647
15407
    if ((unsigned)(p_my + tab_bias) < tab_size) {
648
15407
        s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
649
15407
        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
15407
}
655
656
/**
657
 * @return the mb_type
658
 */
659
15266
static int set_direct_mv(MpegEncContext *s)
660
{
661
15266
    const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
662
15266
    Picture *p = &s->next_picture;
663
15266
    int colocated_mb_type = p->mb_type[mb_index];
664
    int i;
665
666

15266
    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
15266
    if (IS_8X8(colocated_mb_type)) {
672
47
        s->mv_type = MV_TYPE_8X8;
673
235
        for (i = 0; i < 4; i++)
674
188
            set_one_direct_mv(s, p, i);
675
47
        return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
676
    } else {
677
15219
        set_one_direct_mv(s, p, 0);
678
15219
        s->mv[0][1][0] =
679
15219
        s->mv[0][2][0] =
680
15219
        s->mv[0][3][0] = s->mv[0][0][0];
681
15219
        s->mv[0][1][1] =
682
15219
        s->mv[0][2][1] =
683
15219
        s->mv[0][3][1] = s->mv[0][0][1];
684
15219
        s->mv[1][1][0] =
685
15219
        s->mv[1][2][0] =
686
15219
        s->mv[1][3][0] = s->mv[1][0][0];
687
15219
        s->mv[1][1][1] =
688
15219
        s->mv[1][2][1] =
689
15219
        s->mv[1][3][1] = s->mv[1][0][1];
690
15219
        s->mv_type = MV_TYPE_8X8;
691
        // Note see prev line
692
15219
        return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
693
    }
694
}
695
696
441138
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
441138
    const int xy= s->mb_x + s->mb_y * s->mb_stride;
702
441138
    int cbpb = 0, pb_mv_count = 0;
703
704
    av_assert2(!s->h263_pred);
705
706
441138
    if (s->pict_type == AV_PICTURE_TYPE_P) {
707
        do{
708
367701
            if (get_bits1(&s->gb)) {
709
                /* skip mb */
710
9305
                s->mb_intra = 0;
711
65135
                for(i=0;i<6;i++)
712
55830
                    s->block_last_index[i] = -1;
713
9305
                s->mv_dir = MV_DIR_FORWARD;
714
9305
                s->mv_type = MV_TYPE_16X16;
715
9305
                s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
716
9305
                s->mv[0][0][0] = 0;
717
9305
                s->mv[0][0][1] = 0;
718
9305
                s->mb_skipped = !(s->obmc | s->loop_filter);
719
9305
                goto end;
720
            }
721
358396
            cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
722
358396
            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
358396
        }while(cbpc == 20);
727
728
358396
        s->bdsp.clear_blocks(s->block[0]);
729
730
358396
        dquant = cbpc & 8;
731
358396
        s->mb_intra = ((cbpc & 4) != 0);
732
358396
        if (s->mb_intra) goto intra;
733
734

344972
        if(s->pb_frame && get_bits1(&s->gb))
735
            pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
736
344972
        cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
737
738
344972
        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

344972
        if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
744
307128
            cbpy ^= 0xF;
745
746
344972
        cbp = (cbpc & 3) | (cbpy << 2);
747
344972
        if (dquant) {
748
            h263_decode_dquant(s);
749
        }
750
751
344972
        s->mv_dir = MV_DIR_FORWARD;
752
344972
        if ((cbpc & 16) == 0) {
753
343929
            s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
754
            /* 16x16 motion prediction */
755
343929
            s->mv_type = MV_TYPE_16X16;
756
343929
            ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
757
343929
            if (s->umvplus)
758
51649
               mx = h263p_decode_umotion(s, pred_x);
759
            else
760
292280
               mx = ff_h263_decode_motion(s, pred_x, 1);
761
762
343929
            if (mx >= 0xffff)
763
                return SLICE_ERROR;
764
765
343929
            if (s->umvplus)
766
51649
               my = h263p_decode_umotion(s, pred_y);
767
            else
768
292280
               my = ff_h263_decode_motion(s, pred_y, 1);
769
770
343929
            if (my >= 0xffff)
771
                return SLICE_ERROR;
772
343929
            s->mv[0][0][0] = mx;
773
343929
            s->mv[0][0][1] = my;
774
775

343929
            if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
776
340
               skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
777
        } else {
778
1043
            s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
779
1043
            s->mv_type = MV_TYPE_8X8;
780
5215
            for(i=0;i<4;i++) {
781
4172
                mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
782
4172
                if (s->umvplus)
783
                    mx = h263p_decode_umotion(s, pred_x);
784
                else
785
4172
                    mx = ff_h263_decode_motion(s, pred_x, 1);
786
4172
                if (mx >= 0xffff)
787
                    return SLICE_ERROR;
788
789
4172
                if (s->umvplus)
790
                    my = h263p_decode_umotion(s, pred_y);
791
                else
792
4172
                    my = ff_h263_decode_motion(s, pred_y, 1);
793
4172
                if (my >= 0xffff)
794
                    return SLICE_ERROR;
795
4172
                s->mv[0][i][0] = mx;
796
4172
                s->mv[0][i][1] = my;
797

4172
                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
798
                  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
799
4172
                mot_val[0] = mx;
800
4172
                mot_val[1] = my;
801
            }
802
        }
803
73437
    } else if(s->pict_type==AV_PICTURE_TYPE_B) {
804
        int mb_type;
805
21600
        const int stride= s->b8_stride;
806
21600
        int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
807
21600
        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
21600
        mot_val0[0       ]= mot_val0[2       ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
812
21600
        mot_val0[1       ]= mot_val0[3       ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
813
21600
        mot_val1[0       ]= mot_val1[2       ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
814
21600
        mot_val1[1       ]= mot_val1[3       ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
815
816
        do{
817
21600
            mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
818
21600
            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
21600
            mb_type= h263_mb_type_b_map[ mb_type ];
824
21600
        }while(!mb_type);
825
826
21600
        s->mb_intra = IS_INTRA(mb_type);
827
21600
        if(HAS_CBP(mb_type)){
828
11402
            s->bdsp.clear_blocks(s->block[0]);
829
11402
            cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
830
11402
            if(s->mb_intra){
831
46
                dquant = IS_QUANT(mb_type);
832
46
                goto intra;
833
            }
834
835
11356
            cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
836
837
11356
            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

11356
            if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
843
11356
                cbpy ^= 0xF;
844
845
11356
            cbp = (cbpc & 3) | (cbpy << 2);
846
        }else
847
10198
            cbp=0;
848
849
        av_assert2(!s->mb_intra);
850
851
21554
        if(IS_QUANT(mb_type)){
852
            h263_decode_dquant(s);
853
        }
854
855
21554
        if(IS_DIRECT(mb_type)){
856
15266
            s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
857
15266
            mb_type |= set_direct_mv(s);
858
        }else{
859
6288
            s->mv_dir = 0;
860
6288
            s->mv_type= MV_TYPE_16X16;
861
//FIXME UMV
862
863
6288
            if(USES_LIST(mb_type, 0)){
864
2594
                int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
865
2594
                s->mv_dir = MV_DIR_FORWARD;
866
867
2594
                if (s->umvplus)
868
                    mx = h263p_decode_umotion(s, pred_x);
869
                else
870
2594
                    mx = ff_h263_decode_motion(s, pred_x, 1);
871
2594
                if (mx >= 0xffff)
872
                    return SLICE_ERROR;
873
874
2594
                if (s->umvplus)
875
                    my = h263p_decode_umotion(s, pred_y);
876
                else
877
2594
                    my = ff_h263_decode_motion(s, pred_y, 1);
878
2594
                if (my >= 0xffff)
879
                    return SLICE_ERROR;
880
881

2594
                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
882
                    skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
883
884
2594
                s->mv[0][0][0] = mx;
885
2594
                s->mv[0][0][1] = my;
886
2594
                mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
887
2594
                mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
888
            }
889
890
6288
            if(USES_LIST(mb_type, 1)){
891
3694
                int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
892
3694
                s->mv_dir |= MV_DIR_BACKWARD;
893
894
3694
                if (s->umvplus)
895
                    mx = h263p_decode_umotion(s, pred_x);
896
                else
897
3694
                    mx = ff_h263_decode_motion(s, pred_x, 1);
898
3694
                if (mx >= 0xffff)
899
                    return SLICE_ERROR;
900
901
3694
                if (s->umvplus)
902
                    my = h263p_decode_umotion(s, pred_y);
903
                else
904
3694
                    my = ff_h263_decode_motion(s, pred_y, 1);
905
3694
                if (my >= 0xffff)
906
                    return SLICE_ERROR;
907
908

3694
                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
909
                    skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
910
911
3694
                s->mv[1][0][0] = mx;
912
3694
                s->mv[1][0][1] = my;
913
3694
                mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
914
3694
                mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
915
            }
916
        }
917
918
21554
        s->current_picture.mb_type[xy] = mb_type;
919
    } else { /* I-Frame */
920
        do{
921
51837
            cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
922
51837
            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
51837
        }while(cbpc == 8);
927
928
51837
        s->bdsp.clear_blocks(s->block[0]);
929
930
51837
        dquant = cbpc & 4;
931
51837
        s->mb_intra = 1;
932
65307
intra:
933
65307
        s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
934
65307
        if (s->h263_aic) {
935
15183
            s->ac_pred = get_bits1(&s->gb);
936
15183
            if(s->ac_pred){
937
739
                s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
938
939
739
                s->h263_aic_dir = get_bits1(&s->gb);
940
            }
941
        }else
942
50124
            s->ac_pred = 0;
943
944

65307
        if(s->pb_frame && get_bits1(&s->gb))
945
            pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
946
65307
        cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
947
65307
        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
65307
        cbp = (cbpc & 3) | (cbpy << 2);
952
65307
        if (dquant) {
953
            h263_decode_dquant(s);
954
        }
955
956
65307
        pb_mv_count += !!s->pb_frame;
957
    }
958
959
431833
    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
3022831
    for (i = 0; i < 6; i++) {
966
2590998
        if (h263_decode_block(s, block[i], i, cbp&32) < 0)
967
            return -1;
968
2590998
        cbp+=cbp;
969
    }
970
971

431833
    if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
972
        return -1;
973

431833
    if(s->obmc && !s->mb_intra){
974

50805
        if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
975
48550
            preview_obmc(s);
976
    }
977
383283
end:
978
979
441138
    if (get_bits_left(&s->gb) < 0)
980
        return AVERROR_INVALIDDATA;
981
982
        /* per-MB end of slice check */
983
    {
984
441138
        int v= show_bits(&s->gb, 16);
985
986
441138
        if (get_bits_left(&s->gb) < 16) {
987
1616
            v >>= 16 - get_bits_left(&s->gb);
988
        }
989
990
441138
        if(v==0)
991
3742
            return SLICE_END;
992
    }
993
994
437396
    return SLICE_OK;
995
}
996
997
/* Most is hardcoded; should extend to handle all H.263 streams. */
998
461
int ff_h263_decode_picture_header(MpegEncContext *s)
999
{
1000
    int format, width, height, i, ret;
1001
    uint32_t startcode;
1002
1003
461
    align_get_bits(&s->gb);
1004
1005

461
    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
461
    startcode= get_bits(&s->gb, 22-8);
1010
1011
461
    for(i= get_bits_left(&s->gb); i>24; i-=8) {
1012
461
        startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
1013
1014
461
        if(startcode == 0x20)
1015
461
            break;
1016
    }
1017
1018
461
    if (startcode != 0x20) {
1019
        av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
1020
        return -1;
1021
    }
1022
    /* temporal reference */
1023
461
    i = get_bits(&s->gb, 8); /* picture timestamp */
1024
1025
461
    i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
1026
1027
461
    s->picture_number= (s->picture_number&~0xFF) + i;
1028
1029
    /* PTYPE starts here */
1030
461
    if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
1031
        return -1;
1032
    }
1033
461
    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
461
    skip_bits1(&s->gb);         /* split screen off */
1038
461
    skip_bits1(&s->gb);         /* camera  off */
1039
461
    skip_bits1(&s->gb);         /* freeze picture release off */
1040
1041
461
    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

461
    if (format != 7 && format != 6) {
1050
307
        s->h263_plus = 0;
1051
        /* H.263v1 */
1052
307
        width = ff_h263_format[format][0];
1053
307
        height = ff_h263_format[format][1];
1054
307
        if (!width)
1055
            return -1;
1056
1057
307
        s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
1058
1059
307
        s->h263_long_vectors = get_bits1(&s->gb);
1060
1061
307
        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
307
        s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1066

307
        s->unrestricted_mv = s->h263_long_vectors || s->obmc;
1067
1068
307
        s->pb_frame = get_bits1(&s->gb);
1069
307
        s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
1070
307
        skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
1071
1072
307
        s->width = width;
1073
307
        s->height = height;
1074
307
        s->avctx->sample_aspect_ratio= (AVRational){12,11};
1075
307
        s->avctx->framerate = (AVRational){ 30000, 1001 };
1076
    } else {
1077
        int ufep;
1078
1079
        /* H.263v2 */
1080
154
        s->h263_plus = 1;
1081
154
        ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
1082
1083
        /* ufep other than 0 and 1 are reserved */
1084
154
        if (ufep == 1) {
1085
            /* OPPTYPE */
1086
154
            format = get_bits(&s->gb, 3);
1087
            ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
1088
154
            s->custom_pcf= get_bits1(&s->gb);
1089
154
            s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
1090
154
            if (get_bits1(&s->gb) != 0) {
1091
                av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
1092
            }
1093
154
            s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1094
154
            s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
1095
154
            s->loop_filter= get_bits1(&s->gb);
1096

154
            s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
1097
154
            if(s->avctx->lowres)
1098
                s->loop_filter = 0;
1099
1100
154
            s->h263_slice_structured= get_bits1(&s->gb);
1101
154
            if (get_bits1(&s->gb) != 0) {
1102
                av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
1103
            }
1104
154
            if (get_bits1(&s->gb) != 0) {
1105
                av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
1106
            }
1107
154
            s->alt_inter_vlc= get_bits1(&s->gb);
1108
154
            s->modified_quant= get_bits1(&s->gb);
1109
154
            if(s->modified_quant)
1110
154
                s->chroma_qscale_table= ff_h263_chroma_qscale_table;
1111
1112
154
            skip_bits(&s->gb, 1); /* Prevent start code emulation */
1113
1114
154
            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
154
        s->pict_type = get_bits(&s->gb, 3);
1122

154
        switch(s->pict_type){
1123
19
        case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
1124
135
        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
154
        skip_bits(&s->gb, 2);
1132
154
        s->no_rounding = get_bits1(&s->gb);
1133
154
        skip_bits(&s->gb, 4);
1134
1135
        /* Get the picture dimensions */
1136
154
        if (ufep) {
1137
154
            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
154
                width = ff_h263_format[format][0];
1163
154
                height = ff_h263_format[format][1];
1164
154
                s->avctx->sample_aspect_ratio= (AVRational){12,11};
1165
            }
1166
154
            s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
1167

154
            if ((width == 0) || (height == 0))
1168
                return -1;
1169
154
            s->width = width;
1170
154
            s->height = height;
1171
1172
154
            if(s->custom_pcf){
1173
                int gcd;
1174
154
                s->avctx->framerate.num  = 1800000;
1175
154
                s->avctx->framerate.den  = 1000 + get_bits1(&s->gb);
1176
154
                s->avctx->framerate.den *= get_bits(&s->gb, 7);
1177
154
                if(s->avctx->framerate.den == 0){
1178
                    av_log(s, AV_LOG_ERROR, "zero framerate\n");
1179
                    return -1;
1180
                }
1181
154
                gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1182
154
                s->avctx->framerate.den /= gcd;
1183
154
                s->avctx->framerate.num /= gcd;
1184
            }else{
1185
                s->avctx->framerate = (AVRational){ 30000, 1001 };
1186
            }
1187
        }
1188
1189
154
        if(s->custom_pcf){
1190
154
            skip_bits(&s->gb, 2); //extended Temporal reference
1191
        }
1192
1193
154
        if (ufep) {
1194
154
            if (s->umvplus) {
1195
154
                if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1196
154
                    skip_bits1(&s->gb);
1197
            }
1198
154
            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
154
            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
154
        s->qscale = get_bits(&s->gb, 5);
1215
    }
1216
1217
461
    if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1218
        return ret;
1219
1220
461
    if (!(s->avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1221
461
        if ((s->width * s->height / 256 / 8) > get_bits_left(&s->gb))
1222
            return AVERROR_INVALIDDATA;
1223
    }
1224
1225
461
    s->mb_width = (s->width  + 15) / 16;
1226
461
    s->mb_height = (s->height  + 15) / 16;
1227
461
    s->mb_num = s->mb_width * s->mb_height;
1228
1229
461
    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
461
    if (s->pict_type!=AV_PICTURE_TYPE_B) {
1237
461
        s->time            = s->picture_number;
1238
461
        s->pp_time         = s->time - s->last_non_b_time;
1239
461
        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
461
    if (skip_1stop_8data_bits(&s->gb) < 0)
1254
        return AVERROR_INVALIDDATA;
1255
1256
461
    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
461
    s->f_code = 1;
1268
1269
461
    if (s->pict_type == AV_PICTURE_TYPE_B)
1270
        s->low_delay = 0;
1271
1272
461
    if(s->h263_aic){
1273
154
         s->y_dc_scale_table=
1274
154
         s->c_dc_scale_table= ff_aic_dc_scale_table;
1275
    }else{
1276
307
        s->y_dc_scale_table=
1277
307
        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
1278
    }
1279
1280
461
        ff_h263_show_pict_info(s);
1281

461
    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
461
    return 0;
1297
}