GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/ituh263dec.c Lines: 513 758 67.7 %
Date: 2019-11-20 04:07:19 Branches: 256 518 49.4 %

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 "avcodec.h"
38
#include "mpegvideo.h"
39
#include "h263.h"
40
#include "h263data.h"
41
#include "internal.h"
42
#include "mathops.h"
43
#include "mpegutils.h"
44
#include "unary.h"
45
#include "flv.h"
46
#include "rv10.h"
47
#include "mpeg4video.h"
48
#include "mpegvideodata.h"
49
50
// The defines below define the number of bits that are read at once for
51
// reading vlc values. Changing these may improve speed and data cache needs
52
// be aware though that decreasing them may need the number of stages that is
53
// passed to get_vlc* to be increased.
54
#define MV_VLC_BITS 9
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
static VLC 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
302
av_cold void ff_h263_decode_init_vlc(void)
109
{
110
    static volatile int done = 0;
111
112
302
    if (!done) {
113
168
        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
168
        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
168
        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
168
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
123
                 &ff_mvtab[0][1], 2, 1,
124
                 &ff_mvtab[0][0], 2, 1, 538);
125
168
        ff_rl_init(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]);
126
168
        ff_rl_init(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]);
127

5544
        INIT_VLC_RL(ff_h263_rl_inter, 554);
128

5544
        INIT_VLC_RL(ff_rl_intra_aic, 554);
129
168
        INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
130
                 &ff_h263_mbtype_b_tab[0][1], 2, 1,
131
                 &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
132
168
        INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
133
                 &ff_cbpc_b_tab[0][1], 2, 1,
134
                 &ff_cbpc_b_tab[0][0], 2, 1, 8);
135
168
        done = 1;
136
    }
137
302
}
138
139
742
int ff_h263_decode_mba(MpegEncContext *s)
140
{
141
    int i, mb_pos;
142
143
2226
    for (i = 0; i < 6; i++)
144
2226
        if (s->mb_num - 1 <= ff_mba_max[i])
145
742
            break;
146
742
    mb_pos  = get_bits(&s->gb, ff_mba_length[i]);
147
742
    s->mb_x = mb_pos % s->mb_width;
148
742
    s->mb_y = mb_pos / s->mb_width;
149
150
742
    return mb_pos;
151
}
152
153
/**
154
 * Decode the group of blocks header or slice header.
155
 * @return <0 if an error occurred
156
 */
157
2544
static int h263_decode_gob_header(MpegEncContext *s)
158
{
159
    unsigned int val, gob_number;
160
    int left;
161
162
    /* Check for GOB Start Code */
163
2544
    val = show_bits(&s->gb, 16);
164
2544
    if(val)
165
        return -1;
166
167
        /* We have a GBSC probably with GSTUFF */
168
2544
    skip_bits(&s->gb, 16); /* Drop the zeros */
169
2544
    left= get_bits_left(&s->gb);
170
2544
    left = FFMIN(left, 32);
171
    //MN: we must check the bits left or we might end in an infinite loop (or segfault)
172
11538
    for(;left>13; left--){
173
11538
        if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
174
    }
175
2544
    if(left<=13)
176
        return -1;
177
178
2544
    if(s->h263_slice_structured){
179
        if(check_marker(s->avctx, &s->gb, "before MBA")==0)
180
            return -1;
181
182
        ff_h263_decode_mba(s);
183
184
        if(s->mb_num > 1583)
185
            if(check_marker(s->avctx, &s->gb, "after MBA")==0)
186
                return -1;
187
188
        s->qscale = get_bits(&s->gb, 5); /* SQUANT */
189
        if(check_marker(s->avctx, &s->gb, "after SQUANT")==0)
190
            return -1;
191
        skip_bits(&s->gb, 2); /* GFID */
192
    }else{
193
2544
        gob_number = get_bits(&s->gb, 5); /* GN */
194
2544
        s->mb_x= 0;
195
2544
        s->mb_y= s->gob_index* gob_number;
196
2544
        skip_bits(&s->gb, 2); /* GFID */
197
2544
        s->qscale = get_bits(&s->gb, 5); /* GQUANT */
198
    }
199
200
2544
    if(s->mb_y >= s->mb_height)
201
        return -1;
202
203
2544
    if(s->qscale==0)
204
        return -1;
205
206
2544
    return 0;
207
}
208
209
/**
210
 * Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
211
 * @return bit position of the resync_marker, or <0 if none was found
212
 */
213
6411
int ff_h263_resync(MpegEncContext *s){
214
    int left, pos, ret;
215
216
    /* In MPEG-4 studio mode look for a new slice startcode
217
     * and decode slice header */
218

6411
    if(s->codec_id==AV_CODEC_ID_MPEG4 && s->studio_profile) {
219
        align_get_bits(&s->gb);
220
221
        while (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) != SLICE_START_CODE) {
222
            get_bits(&s->gb, 8);
223
        }
224
225
        if (get_bits_left(&s->gb) >= 32 && show_bits_long(&s->gb, 32) == SLICE_START_CODE)
226
            return get_bits_count(&s->gb);
227
        else
228
            return -1;
229
    }
230
231
6411
    if(s->codec_id==AV_CODEC_ID_MPEG4){
232
3867
        skip_bits1(&s->gb);
233
3867
        align_get_bits(&s->gb);
234
    }
235
236
6411
    if(show_bits(&s->gb, 16)==0){
237
6411
        pos= get_bits_count(&s->gb);
238
6411
        if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
239
3867
            ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
240
        else
241
2544
            ret= h263_decode_gob_header(s);
242
6411
        if(ret>=0)
243
6411
            return pos;
244
    }
245
    //OK, it's not where it is supposed to be ...
246
    s->gb= s->last_resync_gb;
247
    align_get_bits(&s->gb);
248
    left= get_bits_left(&s->gb);
249
250
    for(;left>16+1+5+5; left-=8){
251
        if(show_bits(&s->gb, 16)==0){
252
            GetBitContext bak= s->gb;
253
254
            pos= get_bits_count(&s->gb);
255
            if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
256
                ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
257
            else
258
                ret= h263_decode_gob_header(s);
259
            if(ret>=0)
260
                return pos;
261
262
            s->gb= bak;
263
        }
264
        skip_bits(&s->gb, 8);
265
    }
266
267
    return -1;
268
}
269
270
3787838
int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
271
{
272
    int code, val, sign, shift;
273
3787838
    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
274
275
3787838
    if (code == 0)
276
1862335
        return pred;
277
1925503
    if (code < 0)
278
        return 0xffff;
279
280
1925503
    sign = get_bits1(&s->gb);
281
1925503
    shift = f_code - 1;
282
1925503
    val = code;
283
1925503
    if (shift) {
284
222315
        val = (val - 1) << shift;
285
222315
        val |= get_bits(&s->gb, shift);
286
222315
        val++;
287
    }
288
1925503
    if (sign)
289
807460
        val = -val;
290
1925503
    val += pred;
291
292
    /* modulo decoding */
293
1925503
    if (!s->h263_long_vectors) {
294
1925503
        val = sign_extend(val, 5 + f_code);
295
    } else {
296
        /* horrible H.263 long vector mode */
297
        if (pred < -31 && val < -63)
298
            val += 64;
299
        if (pred > 32 && val > 63)
300
            val -= 64;
301
302
    }
303
1925503
    return val;
304
}
305
306
307
/* Decode RVLC of H.263+ UMV */
308
103298
static int h263p_decode_umotion(MpegEncContext * s, int pred)
309
{
310
103298
   int code = 0, sign;
311
312
103298
   if (get_bits1(&s->gb)) /* Motion difference = 0 */
313
51255
      return pred;
314
315
52043
   code = 2 + get_bits1(&s->gb);
316
317
80802
   while (get_bits1(&s->gb))
318
   {
319
28759
      code <<= 1;
320
28759
      code += get_bits1(&s->gb);
321
28759
      if (code >= 32768) {
322
          avpriv_request_sample(s->avctx, "Huge DMV");
323
          return 0xffff;
324
      }
325
   }
326
52043
   sign = code & 1;
327
52043
   code >>= 1;
328
329
52043
   code = (sign) ? (pred - code) : (pred + code);
330
   ff_tlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
331
52043
   return code;
332
333
}
334
335
/**
336
 * read the next MVs for OBMC. yes this is an ugly hack, feel free to send a patch :)
337
 */
338
48550
static void preview_obmc(MpegEncContext *s){
339
48550
    GetBitContext gb= s->gb;
340
341
    int cbpc, i, pred_x, pred_y, mx, my;
342
    int16_t *mot_val;
343
48550
    const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
344
48550
    const int stride= s->b8_stride*2;
345
346
242750
    for(i=0; i<4; i++)
347
194200
        s->block_index[i]+= 2;
348
145650
    for(i=4; i<6; i++)
349
97100
        s->block_index[i]+= 1;
350
48550
    s->mb_x++;
351
352
    av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
353
354
    do{
355
48550
        if (get_bits1(&s->gb)) {
356
            /* skip mb */
357
654
            mot_val = s->current_picture.motion_val[0][s->block_index[0]];
358
654
            mot_val[0       ]= mot_val[2       ]=
359
654
            mot_val[0+stride]= mot_val[2+stride]= 0;
360
654
            mot_val[1       ]= mot_val[3       ]=
361
654
            mot_val[1+stride]= mot_val[3+stride]= 0;
362
363
654
            s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
364
654
            goto end;
365
        }
366
47896
        cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
367
47896
    }while(cbpc == 20);
368
369
47896
    if(cbpc & 4){
370
957
        s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
371
    }else{
372
46939
        get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
373
46939
        if (cbpc & 8) {
374
            if(s->modified_quant){
375
                if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
376
                else                  skip_bits(&s->gb, 5);
377
            }else
378
                skip_bits(&s->gb, 2);
379
        }
380
381
46939
        if ((cbpc & 16) == 0) {
382
46939
                s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
383
                /* 16x16 motion prediction */
384
46939
                mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
385
46939
                if (s->umvplus)
386
                    mx = h263p_decode_umotion(s, pred_x);
387
                else
388
46939
                    mx = ff_h263_decode_motion(s, pred_x, 1);
389
390
46939
                if (s->umvplus)
391
                    my = h263p_decode_umotion(s, pred_y);
392
                else
393
46939
                    my = ff_h263_decode_motion(s, pred_y, 1);
394
395
46939
                mot_val[0       ]= mot_val[2       ]=
396
46939
                mot_val[0+stride]= mot_val[2+stride]= mx;
397
46939
                mot_val[1       ]= mot_val[3       ]=
398
46939
                mot_val[1+stride]= mot_val[3+stride]= my;
399
        } else {
400
            s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
401
            for(i=0;i<4;i++) {
402
                mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
403
                if (s->umvplus)
404
                    mx = h263p_decode_umotion(s, pred_x);
405
                else
406
                    mx = ff_h263_decode_motion(s, pred_x, 1);
407
408
                if (s->umvplus)
409
                    my = h263p_decode_umotion(s, pred_y);
410
                else
411
                    my = ff_h263_decode_motion(s, pred_y, 1);
412
                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
413
                    skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
414
                mot_val[0] = mx;
415
                mot_val[1] = my;
416
            }
417
        }
418
    }
419
end:
420
421
242750
    for(i=0; i<4; i++)
422
194200
        s->block_index[i]-= 2;
423
145650
    for(i=4; i<6; i++)
424
97100
        s->block_index[i]-= 1;
425
48550
    s->mb_x--;
426
427
48550
    s->gb= gb;
428
48550
}
429
430
static void h263_decode_dquant(MpegEncContext *s){
431
    static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
432
433
    if(s->modified_quant){
434
        if(get_bits1(&s->gb))
435
            s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
436
        else
437
            s->qscale= get_bits(&s->gb, 5);
438
    }else
439
        s->qscale += quant_tab[get_bits(&s->gb, 2)];
440
    ff_set_qscale(s, s->qscale);
441
}
442
443
2828502
static int h263_decode_block(MpegEncContext * s, int16_t * block,
444
                             int n, int coded)
445
{
446
    int level, i, j, run;
447
2828502
    RLTable *rl = &ff_h263_rl_inter;
448
    const uint8_t *scan_table;
449
2828502
    GetBitContext gb= s->gb;
450
451
2828502
    scan_table = s->intra_scantable.permutated;
452

2828502
    if (s->h263_aic && s->mb_intra) {
453
91098
        rl = &ff_rl_intra_aic;
454
91098
        i = 0;
455
91098
        if (s->ac_pred) {
456
4434
            if (s->h263_aic_dir)
457
1596
                scan_table = s->intra_v_scantable.permutated; /* left */
458
            else
459
2838
                scan_table = s->intra_h_scantable.permutated; /* top */
460
        }
461
2737404
    } else if (s->mb_intra) {
462
        /* DC coef */
463
327756
        if (CONFIG_RV10_DECODER && s->codec_id == AV_CODEC_ID_RV10) {
464

46710
          if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
465
            int component, diff;
466
            component = (n <= 3 ? 0 : n - 4 + 1);
467
            level = s->last_dc[component];
468
            if (s->rv10_first_dc_coded[component]) {
469
                diff = ff_rv_decode_dc(s, n);
470
                if (diff == 0xffff)
471
                    return -1;
472
                level += diff;
473
                level = level & 0xff; /* handle wrap round */
474
                s->last_dc[component] = level;
475
            } else {
476
                s->rv10_first_dc_coded[component] = 1;
477
            }
478
          } else {
479
46710
                level = get_bits(&s->gb, 8);
480
46710
                if (level == 255)
481
542
                    level = 128;
482
          }
483
        }else{
484
281046
            level = get_bits(&s->gb, 8);
485
281046
            if((level&0x7F) == 0){
486
                av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
487
                if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
488
                    return -1;
489
            }
490
281046
            if (level == 255)
491
3309
                level = 128;
492
        }
493
327756
        block[0] = level;
494
327756
        i = 1;
495
    } else {
496
2409648
        i = 0;
497
    }
498
2828502
    if (!coded) {
499

1340005
        if (s->mb_intra && s->h263_aic)
500
3823
            goto not_coded;
501
1336182
        s->block_last_index[n] = i - 1;
502
1336182
        return 0;
503
    }
504
1488497
retry:
505
    {
506
1554956
    OPEN_READER(re, &s->gb);
507
1554956
    i--; // offset by -1 to allow direct indexing of scan_table
508
    for(;;) {
509
15315950
        UPDATE_CACHE(re, &s->gb);
510
15315950
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
511
15315950
        if (run == 66) {
512
640501
            if (level){
513
                CLOSE_READER(re, &s->gb);
514
                av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
515
                return -1;
516
            }
517
            /* escape */
518
640501
            if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
519
170446
                int is11 = SHOW_UBITS(re, &s->gb, 1);
520
170446
                SKIP_CACHE(re, &s->gb, 1);
521
170446
                run = SHOW_UBITS(re, &s->gb, 7) + 1;
522
170446
                if (is11) {
523
                    SKIP_COUNTER(re, &s->gb, 1 + 7);
524
                    UPDATE_CACHE(re, &s->gb);
525
                    level = SHOW_SBITS(re, &s->gb, 11);
526
                    SKIP_COUNTER(re, &s->gb, 11);
527
                } else {
528
170446
                    SKIP_CACHE(re, &s->gb, 7);
529
170446
                    level = SHOW_SBITS(re, &s->gb, 7);
530
170446
                    SKIP_COUNTER(re, &s->gb, 1 + 7 + 7);
531
                }
532
            } else {
533
470055
                run = SHOW_UBITS(re, &s->gb, 7) + 1;
534
470055
                SKIP_CACHE(re, &s->gb, 7);
535
470055
                level = (int8_t)SHOW_UBITS(re, &s->gb, 8);
536
470055
                SKIP_COUNTER(re, &s->gb, 7 + 8);
537
470055
                if(level == -128){
538
3157
                    UPDATE_CACHE(re, &s->gb);
539
3157
                    if (s->codec_id == AV_CODEC_ID_RV10) {
540
                        /* XXX: should patch encoder too */
541
                        level = SHOW_SBITS(re, &s->gb, 12);
542
                        SKIP_COUNTER(re, &s->gb, 12);
543
                    }else{
544
3157
                        level = SHOW_UBITS(re, &s->gb, 5);
545
3157
                        SKIP_CACHE(re, &s->gb, 5);
546
3157
                        level |= SHOW_SBITS(re, &s->gb, 6) * (1<<5);
547
3157
                        SKIP_COUNTER(re, &s->gb, 5 + 6);
548
                    }
549
                }
550
            }
551
        } else {
552
14675449
            if (SHOW_UBITS(re, &s->gb, 1))
553
7316240
                level = -level;
554
14675449
            SKIP_COUNTER(re, &s->gb, 1);
555
        }
556
15315950
        i += run;
557
15315950
        if (i >= 64){
558
1554956
            CLOSE_READER(re, &s->gb);
559
            // redo update without last flag, revert -1 offset
560
1554956
            i = i - run + ((run-1)&63) + 1;
561
1554956
            if (i < 64) {
562
                // only last marker, no overrun
563
1488497
                block[scan_table[i]] = level;
564
1488497
                break;
565
            }
566

66459
            if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
567
                //Looks like a hack but no, it's the way it is supposed to work ...
568
66459
                rl = &ff_rl_intra_aic;
569
66459
                i = 0;
570
66459
                s->gb= gb;
571
66459
                s->bdsp.clear_block(block);
572
66459
                goto retry;
573
            }
574
            av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
575
            return -1;
576
        }
577
13760994
        j = scan_table[i];
578
13760994
        block[j] = level;
579
    }
580
    }
581
1492320
not_coded:
582

1492320
    if (s->mb_intra && s->h263_aic) {
583
91098
        ff_h263_pred_acdc(s, block, n);
584
91098
        i = 63;
585
    }
586
1492320
    s->block_last_index[n] = i;
587
1492320
    return 0;
588
}
589
590
static int h263_skip_b_part(MpegEncContext *s, int cbp)
591
{
592
    LOCAL_ALIGNED_32(int16_t, dblock, [64]);
593
    int i, mbi;
594
    int bli[6];
595
596
    /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
597
     * but real value should be restored in order to be used later (in OBMC condition)
598
     */
599
    mbi = s->mb_intra;
600
    memcpy(bli, s->block_last_index, sizeof(bli));
601
    s->mb_intra = 0;
602
    for (i = 0; i < 6; i++) {
603
        if (h263_decode_block(s, dblock, i, cbp&32) < 0)
604
            return -1;
605
        cbp+=cbp;
606
    }
607
    s->mb_intra = mbi;
608
    memcpy(s->block_last_index, bli, sizeof(bli));
609
    return 0;
610
}
611
612
static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
613
{
614
    int c, mv = 1;
615
616
    if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
617
        c = get_bits1(gb);
618
        if (pb_frame == 2 && c)
619
            mv = !get_bits1(gb);
620
    } else { // h.263 Annex M improved PB-frame
621
        mv = get_unary(gb, 0, 4) + 1;
622
        c = mv & 1;
623
        mv = !!(mv & 2);
624
    }
625
    if(c)
626
        *cbpb = get_bits(gb, 6);
627
    return mv;
628
}
629
630
#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
631
#define tab_bias (tab_size / 2)
632
15407
static inline void set_one_direct_mv(MpegEncContext *s, Picture *p, int i)
633
{
634
15407
    int xy           = s->block_index[i];
635
15407
    uint16_t time_pp = s->pp_time;
636
15407
    uint16_t time_pb = s->pb_time;
637
    int p_mx, p_my;
638
639
15407
    p_mx = p->motion_val[0][xy][0];
640
15407
    if ((unsigned)(p_mx + tab_bias) < tab_size) {
641
15407
        s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias];
642
15407
        s->mv[1][i][0] = s->direct_scale_mv[1][p_mx + tab_bias];
643
    } else {
644
        s->mv[0][i][0] = p_mx * time_pb / time_pp;
645
        s->mv[1][i][0] = p_mx * (time_pb - time_pp) / time_pp;
646
    }
647
15407
    p_my = p->motion_val[0][xy][1];
648
15407
    if ((unsigned)(p_my + tab_bias) < tab_size) {
649
15407
        s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias];
650
15407
        s->mv[1][i][1] = s->direct_scale_mv[1][p_my + tab_bias];
651
    } else {
652
        s->mv[0][i][1] = p_my * time_pb / time_pp;
653
        s->mv[1][i][1] = p_my * (time_pb - time_pp) / time_pp;
654
    }
655
15407
}
656
657
/**
658
 * @return the mb_type
659
 */
660
15266
static int set_direct_mv(MpegEncContext *s)
661
{
662
15266
    const int mb_index = s->mb_x + s->mb_y * s->mb_stride;
663
15266
    Picture *p = &s->next_picture;
664
15266
    int colocated_mb_type = p->mb_type[mb_index];
665
    int i;
666
667

15266
    if (s->codec_tag == AV_RL32("U263") && p->f->pict_type == AV_PICTURE_TYPE_I) {
668
        p = &s->last_picture;
669
        colocated_mb_type = p->mb_type[mb_index];
670
    }
671
672
15266
    if (IS_8X8(colocated_mb_type)) {
673
47
        s->mv_type = MV_TYPE_8X8;
674
235
        for (i = 0; i < 4; i++)
675
188
            set_one_direct_mv(s, p, i);
676
47
        return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
677
    } else {
678
15219
        set_one_direct_mv(s, p, 0);
679
15219
        s->mv[0][1][0] =
680
15219
        s->mv[0][2][0] =
681
15219
        s->mv[0][3][0] = s->mv[0][0][0];
682
15219
        s->mv[0][1][1] =
683
15219
        s->mv[0][2][1] =
684
15219
        s->mv[0][3][1] = s->mv[0][0][1];
685
15219
        s->mv[1][1][0] =
686
15219
        s->mv[1][2][0] =
687
15219
        s->mv[1][3][0] = s->mv[1][0][0];
688
15219
        s->mv[1][1][1] =
689
15219
        s->mv[1][2][1] =
690
15219
        s->mv[1][3][1] = s->mv[1][0][1];
691
15219
        s->mv_type = MV_TYPE_8X8;
692
        // Note see prev line
693
15219
        return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1;
694
    }
695
}
696
697
480738
int ff_h263_decode_mb(MpegEncContext *s,
698
                      int16_t block[6][64])
699
{
700
    int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
701
    int16_t *mot_val;
702
480738
    const int xy= s->mb_x + s->mb_y * s->mb_stride;
703
480738
    int cbpb = 0, pb_mv_count = 0;
704
705
    av_assert2(!s->h263_pred);
706
707
480738
    if (s->pict_type == AV_PICTURE_TYPE_P) {
708
        do{
709
406113
            if (get_bits1(&s->gb)) {
710
                /* skip mb */
711
9321
                s->mb_intra = 0;
712
65247
                for(i=0;i<6;i++)
713
55926
                    s->block_last_index[i] = -1;
714
9321
                s->mv_dir = MV_DIR_FORWARD;
715
9321
                s->mv_type = MV_TYPE_16X16;
716
9321
                s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
717
9321
                s->mv[0][0][0] = 0;
718
9321
                s->mv[0][0][1] = 0;
719
9321
                s->mb_skipped = !(s->obmc | s->loop_filter);
720
9321
                goto end;
721
            }
722
396792
            cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
723
396792
            if (cbpc < 0){
724
                av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
725
                return SLICE_ERROR;
726
            }
727
396792
        }while(cbpc == 20);
728
729
396792
        s->bdsp.clear_blocks(s->block[0]);
730
731
396792
        dquant = cbpc & 8;
732
396792
        s->mb_intra = ((cbpc & 4) != 0);
733
396792
        if (s->mb_intra) goto intra;
734
735

380054
        if(s->pb_frame && get_bits1(&s->gb))
736
            pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
737
380054
        cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
738
739
380054
        if (cbpy < 0) {
740
            av_log(s->avctx, AV_LOG_ERROR, "cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
741
            return SLICE_ERROR;
742
        }
743
744

380054
        if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
745
342210
            cbpy ^= 0xF;
746
747
380054
        cbp = (cbpc & 3) | (cbpy << 2);
748
380054
        if (dquant) {
749
            h263_decode_dquant(s);
750
        }
751
752
380054
        s->mv_dir = MV_DIR_FORWARD;
753
380054
        if ((cbpc & 16) == 0) {
754
379011
            s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
755
            /* 16x16 motion prediction */
756
379011
            s->mv_type = MV_TYPE_16X16;
757
379011
            ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
758
379011
            if (s->umvplus)
759
51649
               mx = h263p_decode_umotion(s, pred_x);
760
            else
761
327362
               mx = ff_h263_decode_motion(s, pred_x, 1);
762
763
379011
            if (mx >= 0xffff)
764
                return SLICE_ERROR;
765
766
379011
            if (s->umvplus)
767
51649
               my = h263p_decode_umotion(s, pred_y);
768
            else
769
327362
               my = ff_h263_decode_motion(s, pred_y, 1);
770
771
379011
            if (my >= 0xffff)
772
                return SLICE_ERROR;
773
379011
            s->mv[0][0][0] = mx;
774
379011
            s->mv[0][0][1] = my;
775
776

379011
            if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
777
340
               skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
778
        } else {
779
1043
            s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
780
1043
            s->mv_type = MV_TYPE_8X8;
781
5215
            for(i=0;i<4;i++) {
782
4172
                mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
783
4172
                if (s->umvplus)
784
                    mx = h263p_decode_umotion(s, pred_x);
785
                else
786
4172
                    mx = ff_h263_decode_motion(s, pred_x, 1);
787
4172
                if (mx >= 0xffff)
788
                    return SLICE_ERROR;
789
790
4172
                if (s->umvplus)
791
                    my = h263p_decode_umotion(s, pred_y);
792
                else
793
4172
                    my = ff_h263_decode_motion(s, pred_y, 1);
794
4172
                if (my >= 0xffff)
795
                    return SLICE_ERROR;
796
4172
                s->mv[0][i][0] = mx;
797
4172
                s->mv[0][i][1] = my;
798

4172
                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
799
                  skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
800
4172
                mot_val[0] = mx;
801
4172
                mot_val[1] = my;
802
            }
803
        }
804
74625
    } else if(s->pict_type==AV_PICTURE_TYPE_B) {
805
        int mb_type;
806
21600
        const int stride= s->b8_stride;
807
21600
        int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
808
21600
        int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
809
//        const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
810
811
        //FIXME ugly
812
21600
        mot_val0[0       ]= mot_val0[2       ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
813
21600
        mot_val0[1       ]= mot_val0[3       ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
814
21600
        mot_val1[0       ]= mot_val1[2       ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
815
21600
        mot_val1[1       ]= mot_val1[3       ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
816
817
        do{
818
21600
            mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
819
21600
            if (mb_type < 0){
820
                av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
821
                return SLICE_ERROR;
822
            }
823
824
21600
            mb_type= h263_mb_type_b_map[ mb_type ];
825
21600
        }while(!mb_type);
826
827
21600
        s->mb_intra = IS_INTRA(mb_type);
828
21600
        if(HAS_CBP(mb_type)){
829
11402
            s->bdsp.clear_blocks(s->block[0]);
830
11402
            cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
831
11402
            if(s->mb_intra){
832
46
                dquant = IS_QUANT(mb_type);
833
46
                goto intra;
834
            }
835
836
11356
            cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
837
838
11356
            if (cbpy < 0){
839
                av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
840
                return SLICE_ERROR;
841
            }
842
843

11356
            if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
844
11356
                cbpy ^= 0xF;
845
846
11356
            cbp = (cbpc & 3) | (cbpy << 2);
847
        }else
848
10198
            cbp=0;
849
850
        av_assert2(!s->mb_intra);
851
852
21554
        if(IS_QUANT(mb_type)){
853
            h263_decode_dquant(s);
854
        }
855
856
21554
        if(IS_DIRECT(mb_type)){
857
15266
            s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
858
15266
            mb_type |= set_direct_mv(s);
859
        }else{
860
6288
            s->mv_dir = 0;
861
6288
            s->mv_type= MV_TYPE_16X16;
862
//FIXME UMV
863
864
6288
            if(USES_LIST(mb_type, 0)){
865
2594
                int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
866
2594
                s->mv_dir = MV_DIR_FORWARD;
867
868
2594
                if (s->umvplus)
869
                    mx = h263p_decode_umotion(s, pred_x);
870
                else
871
2594
                    mx = ff_h263_decode_motion(s, pred_x, 1);
872
2594
                if (mx >= 0xffff)
873
                    return SLICE_ERROR;
874
875
2594
                if (s->umvplus)
876
                    my = h263p_decode_umotion(s, pred_y);
877
                else
878
2594
                    my = ff_h263_decode_motion(s, pred_y, 1);
879
2594
                if (my >= 0xffff)
880
                    return SLICE_ERROR;
881
882

2594
                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
883
                    skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
884
885
2594
                s->mv[0][0][0] = mx;
886
2594
                s->mv[0][0][1] = my;
887
2594
                mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
888
2594
                mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
889
            }
890
891
6288
            if(USES_LIST(mb_type, 1)){
892
3694
                int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &pred_x, &pred_y);
893
3694
                s->mv_dir |= MV_DIR_BACKWARD;
894
895
3694
                if (s->umvplus)
896
                    mx = h263p_decode_umotion(s, pred_x);
897
                else
898
3694
                    mx = ff_h263_decode_motion(s, pred_x, 1);
899
3694
                if (mx >= 0xffff)
900
                    return SLICE_ERROR;
901
902
3694
                if (s->umvplus)
903
                    my = h263p_decode_umotion(s, pred_y);
904
                else
905
3694
                    my = ff_h263_decode_motion(s, pred_y, 1);
906
3694
                if (my >= 0xffff)
907
                    return SLICE_ERROR;
908
909

3694
                if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
910
                    skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
911
912
3694
                s->mv[1][0][0] = mx;
913
3694
                s->mv[1][0][1] = my;
914
3694
                mot_val[0       ]= mot_val[2       ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
915
3694
                mot_val[1       ]= mot_val[3       ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
916
            }
917
        }
918
919
21554
        s->current_picture.mb_type[xy] = mb_type;
920
    } else { /* I-Frame */
921
        do{
922
53025
            cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
923
53025
            if (cbpc < 0){
924
                av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
925
                return SLICE_ERROR;
926
            }
927
53025
        }while(cbpc == 8);
928
929
53025
        s->bdsp.clear_blocks(s->block[0]);
930
931
53025
        dquant = cbpc & 4;
932
53025
        s->mb_intra = 1;
933
69809
intra:
934
69809
        s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
935
69809
        if (s->h263_aic) {
936
15183
            s->ac_pred = get_bits1(&s->gb);
937
15183
            if(s->ac_pred){
938
739
                s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
939
940
739
                s->h263_aic_dir = get_bits1(&s->gb);
941
            }
942
        }else
943
54626
            s->ac_pred = 0;
944
945

69809
        if(s->pb_frame && get_bits1(&s->gb))
946
            pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
947
69809
        cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
948
69809
        if(cbpy<0){
949
            av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
950
            return SLICE_ERROR;
951
        }
952
69809
        cbp = (cbpc & 3) | (cbpy << 2);
953
69809
        if (dquant) {
954
            h263_decode_dquant(s);
955
        }
956
957
69809
        pb_mv_count += !!s->pb_frame;
958
    }
959
960
471417
    while(pb_mv_count--){
961
        ff_h263_decode_motion(s, 0, 1);
962
        ff_h263_decode_motion(s, 0, 1);
963
    }
964
965
    /* decode each block */
966
3299919
    for (i = 0; i < 6; i++) {
967
2828502
        if (h263_decode_block(s, block[i], i, cbp&32) < 0)
968
            return -1;
969
2828502
        cbp+=cbp;
970
    }
971
972

471417
    if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
973
        return -1;
974

471417
    if(s->obmc && !s->mb_intra){
975

50805
        if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
976
48550
            preview_obmc(s);
977
    }
978
422867
end:
979
980
480738
    if (get_bits_left(&s->gb) < 0)
981
        return AVERROR_INVALIDDATA;
982
983
        /* per-MB end of slice check */
984
    {
985
480738
        int v= show_bits(&s->gb, 16);
986
987
480738
        if (get_bits_left(&s->gb) < 16) {
988
1716
            v >>= 16 - get_bits_left(&s->gb);
989
        }
990
991
480738
        if(v==0)
992
3842
            return SLICE_END;
993
    }
994
995
476896
    return SLICE_OK;
996
}
997
998
/* Most is hardcoded; should extend to handle all H.263 streams. */
999
461
int ff_h263_decode_picture_header(MpegEncContext *s)
1000
{
1001
    int format, width, height, i, ret;
1002
    uint32_t startcode;
1003
1004
461
    align_get_bits(&s->gb);
1005
1006

461
    if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
1007
         av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
1008
    }
1009
1010
461
    startcode= get_bits(&s->gb, 22-8);
1011
1012
461
    for(i= get_bits_left(&s->gb); i>24; i-=8) {
1013
461
        startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
1014
1015
461
        if(startcode == 0x20)
1016
461
            break;
1017
    }
1018
1019
461
    if (startcode != 0x20) {
1020
        av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
1021
        return -1;
1022
    }
1023
    /* temporal reference */
1024
461
    i = get_bits(&s->gb, 8); /* picture timestamp */
1025
1026
461
    i -= (i - (s->picture_number & 0xFF) + 128) & ~0xFF;
1027
1028
461
    s->picture_number= (s->picture_number&~0xFF) + i;
1029
1030
    /* PTYPE starts here */
1031
461
    if (check_marker(s->avctx, &s->gb, "in PTYPE") != 1) {
1032
        return -1;
1033
    }
1034
461
    if (get_bits1(&s->gb) != 0) {
1035
        av_log(s->avctx, AV_LOG_ERROR, "Bad H.263 id\n");
1036
        return -1;      /* H.263 id */
1037
    }
1038
461
    skip_bits1(&s->gb);         /* split screen off */
1039
461
    skip_bits1(&s->gb);         /* camera  off */
1040
461
    skip_bits1(&s->gb);         /* freeze picture release off */
1041
1042
461
    format = get_bits(&s->gb, 3);
1043
    /*
1044
        0    forbidden
1045
        1    sub-QCIF
1046
        10   QCIF
1047
        7       extended PTYPE (PLUSPTYPE)
1048
    */
1049
1050

461
    if (format != 7 && format != 6) {
1051
307
        s->h263_plus = 0;
1052
        /* H.263v1 */
1053
307
        width = ff_h263_format[format][0];
1054
307
        height = ff_h263_format[format][1];
1055
307
        if (!width)
1056
            return -1;
1057
1058
307
        s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
1059
1060
307
        s->h263_long_vectors = get_bits1(&s->gb);
1061
1062
307
        if (get_bits1(&s->gb) != 0) {
1063
            av_log(s->avctx, AV_LOG_ERROR, "H.263 SAC not supported\n");
1064
            return -1; /* SAC: off */
1065
        }
1066
307
        s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1067

307
        s->unrestricted_mv = s->h263_long_vectors || s->obmc;
1068
1069
307
        s->pb_frame = get_bits1(&s->gb);
1070
307
        s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
1071
307
        skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
1072
1073
307
        s->width = width;
1074
307
        s->height = height;
1075
307
        s->avctx->sample_aspect_ratio= (AVRational){12,11};
1076
307
        s->avctx->framerate = (AVRational){ 30000, 1001 };
1077
    } else {
1078
        int ufep;
1079
1080
        /* H.263v2 */
1081
154
        s->h263_plus = 1;
1082
154
        ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
1083
1084
        /* ufep other than 0 and 1 are reserved */
1085
154
        if (ufep == 1) {
1086
            /* OPPTYPE */
1087
154
            format = get_bits(&s->gb, 3);
1088
            ff_dlog(s->avctx, "ufep=1, format: %d\n", format);
1089
154
            s->custom_pcf= get_bits1(&s->gb);
1090
154
            s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
1091
154
            if (get_bits1(&s->gb) != 0) {
1092
                av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
1093
            }
1094
154
            s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
1095
154
            s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
1096
154
            s->loop_filter= get_bits1(&s->gb);
1097

154
            s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
1098
154
            if(s->avctx->lowres)
1099
                s->loop_filter = 0;
1100
1101
154
            s->h263_slice_structured= get_bits1(&s->gb);
1102
154
            if (get_bits1(&s->gb) != 0) {
1103
                av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
1104
            }
1105
154
            if (get_bits1(&s->gb) != 0) {
1106
                av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
1107
            }
1108
154
            s->alt_inter_vlc= get_bits1(&s->gb);
1109
154
            s->modified_quant= get_bits1(&s->gb);
1110
154
            if(s->modified_quant)
1111
154
                s->chroma_qscale_table= ff_h263_chroma_qscale_table;
1112
1113
154
            skip_bits(&s->gb, 1); /* Prevent start code emulation */
1114
1115
154
            skip_bits(&s->gb, 3); /* Reserved */
1116
        } else if (ufep != 0) {
1117
            av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
1118
            return -1;
1119
        }
1120
1121
        /* MPPTYPE */
1122
154
        s->pict_type = get_bits(&s->gb, 3);
1123

154
        switch(s->pict_type){
1124
19
        case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
1125
135
        case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
1126
        case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
1127
        case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
1128
        case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
1129
        default:
1130
            return -1;
1131
        }
1132
154
        skip_bits(&s->gb, 2);
1133
154
        s->no_rounding = get_bits1(&s->gb);
1134
154
        skip_bits(&s->gb, 4);
1135
1136
        /* Get the picture dimensions */
1137
154
        if (ufep) {
1138
154
            if (format == 6) {
1139
                /* Custom Picture Format (CPFMT) */
1140
                s->aspect_ratio_info = get_bits(&s->gb, 4);
1141
                ff_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
1142
                /* aspect ratios:
1143
                0 - forbidden
1144
                1 - 1:1
1145
                2 - 12:11 (CIF 4:3)
1146
                3 - 10:11 (525-type 4:3)
1147
                4 - 16:11 (CIF 16:9)
1148
                5 - 40:33 (525-type 16:9)
1149
                6-14 - reserved
1150
                */
1151
                width = (get_bits(&s->gb, 9) + 1) * 4;
1152
                check_marker(s->avctx, &s->gb, "in dimensions");
1153
                height = get_bits(&s->gb, 9) * 4;
1154
                ff_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
1155
                if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1156
                    /* expected dimensions */
1157
                    s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
1158
                    s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
1159
                }else{
1160
                    s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
1161
                }
1162
            } else {
1163
154
                width = ff_h263_format[format][0];
1164
154
                height = ff_h263_format[format][1];
1165
154
                s->avctx->sample_aspect_ratio= (AVRational){12,11};
1166
            }
1167
154
            s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
1168

154
            if ((width == 0) || (height == 0))
1169
                return -1;
1170
154
            s->width = width;
1171
154
            s->height = height;
1172
1173
154
            if(s->custom_pcf){
1174
                int gcd;
1175
154
                s->avctx->framerate.num  = 1800000;
1176
154
                s->avctx->framerate.den  = 1000 + get_bits1(&s->gb);
1177
154
                s->avctx->framerate.den *= get_bits(&s->gb, 7);
1178
154
                if(s->avctx->framerate.den == 0){
1179
                    av_log(s, AV_LOG_ERROR, "zero framerate\n");
1180
                    return -1;
1181
                }
1182
154
                gcd= av_gcd(s->avctx->framerate.den, s->avctx->framerate.num);
1183
154
                s->avctx->framerate.den /= gcd;
1184
154
                s->avctx->framerate.num /= gcd;
1185
            }else{
1186
                s->avctx->framerate = (AVRational){ 30000, 1001 };
1187
            }
1188
        }
1189
1190
154
        if(s->custom_pcf){
1191
154
            skip_bits(&s->gb, 2); //extended Temporal reference
1192
        }
1193
1194
154
        if (ufep) {
1195
154
            if (s->umvplus) {
1196
154
                if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
1197
154
                    skip_bits1(&s->gb);
1198
            }
1199
154
            if(s->h263_slice_structured){
1200
                if (get_bits1(&s->gb) != 0) {
1201
                    av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
1202
                }
1203
                if (get_bits1(&s->gb) != 0) {
1204
                    av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
1205
                }
1206
            }
1207
154
            if (s->pict_type == AV_PICTURE_TYPE_B) {
1208
                skip_bits(&s->gb, 4); //ELNUM
1209
                if (ufep == 1) {
1210
                    skip_bits(&s->gb, 4); // RLNUM
1211
                }
1212
            }
1213
        }
1214
1215
154
        s->qscale = get_bits(&s->gb, 5);
1216
    }
1217
1218
461
    if ((ret = av_image_check_size(s->width, s->height, 0, s)) < 0)
1219
        return ret;
1220
1221
461
    if (!(s->avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1222
461
        if ((s->width * s->height / 256 / 8) > get_bits_left(&s->gb))
1223
            return AVERROR_INVALIDDATA;
1224
    }
1225
1226
461
    s->mb_width = (s->width  + 15) / 16;
1227
461
    s->mb_height = (s->height  + 15) / 16;
1228
461
    s->mb_num = s->mb_width * s->mb_height;
1229
1230
461
    if (s->pb_frame) {
1231
        skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
1232
        if (s->custom_pcf)
1233
            skip_bits(&s->gb, 2); //extended Temporal reference
1234
        skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
1235
    }
1236
1237
461
    if (s->pict_type!=AV_PICTURE_TYPE_B) {
1238
461
        s->time            = s->picture_number;
1239
461
        s->pp_time         = s->time - s->last_non_b_time;
1240
461
        s->last_non_b_time = s->time;
1241
    }else{
1242
        s->time    = s->picture_number;
1243
        s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
1244
        if (s->pp_time <=s->pb_time ||
1245
            s->pp_time <= s->pp_time - s->pb_time ||
1246
            s->pp_time <= 0){
1247
            s->pp_time = 2;
1248
            s->pb_time = 1;
1249
        }
1250
        ff_mpeg4_init_direct_mv(s);
1251
    }
1252
1253
    /* PEI */
1254
461
    if (skip_1stop_8data_bits(&s->gb) < 0)
1255
        return AVERROR_INVALIDDATA;
1256
1257
461
    if(s->h263_slice_structured){
1258
        if (check_marker(s->avctx, &s->gb, "SEPB1") != 1) {
1259
            return -1;
1260
        }
1261
1262
        ff_h263_decode_mba(s);
1263
1264
        if (check_marker(s->avctx, &s->gb, "SEPB2") != 1) {
1265
            return -1;
1266
        }
1267
    }
1268
461
    s->f_code = 1;
1269
1270
461
    if (s->pict_type == AV_PICTURE_TYPE_B)
1271
        s->low_delay = 0;
1272
1273
461
    if(s->h263_aic){
1274
154
         s->y_dc_scale_table=
1275
154
         s->c_dc_scale_table= ff_aic_dc_scale_table;
1276
    }else{
1277
307
        s->y_dc_scale_table=
1278
307
        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
1279
    }
1280
1281
461
        ff_h263_show_pict_info(s);
1282

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){
1283
        int i,j;
1284
        for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1285
        av_log(s->avctx, AV_LOG_DEBUG, "\n");
1286
        for(i=0; i<13; i++){
1287
            for(j=0; j<3; j++){
1288
                int v= get_bits(&s->gb, 8);
1289
                v |= get_sbits(&s->gb, 8) * (1 << 8);
1290
                av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
1291
            }
1292
            av_log(s->avctx, AV_LOG_DEBUG, "\n");
1293
        }
1294
        for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
1295
    }
1296
1297
461
    return 0;
1298
}