GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpeg12dec.c Lines: 1168 1664 70.2 %
Date: 2019-11-22 03:34:36 Branches: 636 1095 58.1 %

Line Branch Exec Source
1
/*
2
 * MPEG-1/2 decoder
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
4
 * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
/**
24
 * @file
25
 * MPEG-1/2 decoder
26
 */
27
28
#define UNCHECKED_BITSTREAM_READER 1
29
#include <inttypes.h>
30
31
#include "libavutil/attributes.h"
32
#include "libavutil/imgutils.h"
33
#include "libavutil/internal.h"
34
#include "libavutil/stereo3d.h"
35
36
#include "avcodec.h"
37
#include "bytestream.h"
38
#include "error_resilience.h"
39
#include "hwaccel.h"
40
#include "idctdsp.h"
41
#include "internal.h"
42
#include "mpeg_er.h"
43
#include "mpeg12.h"
44
#include "mpeg12data.h"
45
#include "mpegutils.h"
46
#include "mpegvideo.h"
47
#include "mpegvideodata.h"
48
#include "profiles.h"
49
#include "thread.h"
50
#include "version.h"
51
#include "xvmc_internal.h"
52
53
typedef struct Mpeg1Context {
54
    MpegEncContext mpeg_enc_ctx;
55
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
56
    int repeat_field;           /* true if we must repeat the field */
57
    AVPanScan pan_scan;         /* some temporary storage for the panscan */
58
    AVStereo3D stereo3d;
59
    int has_stereo3d;
60
    uint8_t *a53_caption;
61
    int a53_caption_size;
62
    uint8_t afd;
63
    int has_afd;
64
    int slice_count;
65
    AVRational save_aspect;
66
    int save_width, save_height, save_progressive_seq;
67
    AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
68
    int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
69
    int tmpgexs;
70
    int first_slice;
71
    int extradata_decoded;
72
} Mpeg1Context;
73
74
#define MB_TYPE_ZERO_MV   0x20000000
75
76
static const uint32_t ptype2mb_type[7] = {
77
                    MB_TYPE_INTRA,
78
                    MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
79
                    MB_TYPE_L0,
80
                    MB_TYPE_L0 | MB_TYPE_CBP,
81
    MB_TYPE_QUANT | MB_TYPE_INTRA,
82
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
83
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
84
};
85
86
static const uint32_t btype2mb_type[11] = {
87
                    MB_TYPE_INTRA,
88
                    MB_TYPE_L1,
89
                    MB_TYPE_L1   | MB_TYPE_CBP,
90
                    MB_TYPE_L0,
91
                    MB_TYPE_L0   | MB_TYPE_CBP,
92
                    MB_TYPE_L0L1,
93
                    MB_TYPE_L0L1 | MB_TYPE_CBP,
94
    MB_TYPE_QUANT | MB_TYPE_INTRA,
95
    MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
96
    MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
97
    MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
98
};
99
100
/* as H.263, but only 17 codes */
101
4129656
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
102
{
103
    int code, sign, val, shift;
104
105
4129656
    code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
106
4129656
    if (code == 0)
107
1684185
        return pred;
108
2445471
    if (code < 0)
109
        return 0xffff;
110
111
2445471
    sign  = get_bits1(&s->gb);
112
2445471
    shift = fcode - 1;
113
2445471
    val   = code;
114
2445471
    if (shift) {
115
2103529
        val  = (val - 1) << shift;
116
2103529
        val |= get_bits(&s->gb, shift);
117
2103529
        val++;
118
    }
119
2445471
    if (sign)
120
1265834
        val = -val;
121
2445471
    val += pred;
122
123
    /* modulo decoding */
124
2445471
    return sign_extend(val, 5 + shift);
125
}
126
127
#define MAX_INDEX (64 - 1)
128
#define check_scantable_index(ctx, x)                                         \
129
    do {                                                                      \
130
        if ((x) > MAX_INDEX) {                                                \
131
            av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
132
                   ctx->mb_x, ctx->mb_y);                                     \
133
            return AVERROR_INVALIDDATA;                                       \
134
        }                                                                     \
135
    } while (0)
136
137
403118
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
138
                                           int16_t *block, int n)
139
{
140
    int level, i, j, run;
141
403118
    RLTable *rl                  = &ff_rl_mpeg1;
142
403118
    uint8_t *const scantable     = s->intra_scantable.permutated;
143
403118
    const uint16_t *quant_matrix = s->inter_matrix;
144
403118
    const int qscale             = s->qscale;
145
146
    {
147
403118
        OPEN_READER(re, &s->gb);
148
403118
        i = -1;
149
        // special case for first coefficient, no need to add second VLC table
150
403118
        UPDATE_CACHE(re, &s->gb);
151
403118
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
152
101724
            level = (3 * qscale * quant_matrix[0]) >> 5;
153
101724
            level = (level - 1) | 1;
154
101724
            if (GET_CACHE(re, &s->gb) & 0x40000000)
155
56898
                level = -level;
156
101724
            block[0] = level;
157
101724
            i++;
158
101724
            SKIP_BITS(re, &s->gb, 2);
159
101724
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
160
34285
                goto end;
161
        }
162
        /* now quantify & encode AC coefficients */
163
        for (;;) {
164
2921408
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
165
                       TEX_VLC_BITS, 2, 0);
166
167
2921408
            if (level != 0) {
168
2842322
                i += run;
169
2842322
                if (i > MAX_INDEX)
170
                    break;
171
2842322
                j = scantable[i];
172
2842322
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
173
2842322
                level = (level - 1) | 1;
174
2842322
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
175
2842322
                        SHOW_SBITS(re, &s->gb, 1);
176
2842322
                SKIP_BITS(re, &s->gb, 1);
177
            } else {
178
                /* escape */
179
79086
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
180
79086
                LAST_SKIP_BITS(re, &s->gb, 6);
181
79086
                UPDATE_CACHE(re, &s->gb);
182
79086
                level = SHOW_SBITS(re, &s->gb, 8);
183
79086
                SKIP_BITS(re, &s->gb, 8);
184
79086
                if (level == -128) {
185
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
186
                    SKIP_BITS(re, &s->gb, 8);
187
79086
                } else if (level == 0) {
188
                    level = SHOW_UBITS(re, &s->gb, 8);
189
                    SKIP_BITS(re, &s->gb, 8);
190
                }
191
79086
                i += run;
192
79086
                if (i > MAX_INDEX)
193
                    break;
194
79086
                j = scantable[i];
195
79086
                if (level < 0) {
196
38919
                    level = -level;
197
38919
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
198
38919
                    level = (level - 1) | 1;
199
38919
                    level = -level;
200
                } else {
201
40167
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
202
40167
                    level = (level - 1) | 1;
203
                }
204
            }
205
206
2921408
            block[j] = level;
207
2921408
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
208
368833
                break;
209
2552575
            UPDATE_CACHE(re, &s->gb);
210
        }
211
403118
end:
212
403118
        LAST_SKIP_BITS(re, &s->gb, 2);
213
403118
        CLOSE_READER(re, &s->gb);
214
    }
215
216
403118
    check_scantable_index(s, i);
217
218
403118
    s->block_last_index[n] = i;
219
403118
    return 0;
220
}
221
222
/**
223
 * Note: this function can read out of range and crash for corrupt streams.
224
 * Changing this would eat up any speed benefits it has.
225
 * Do not use "fast" flag if you need the code to be robust.
226
 */
227
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
228
                                                int16_t *block, int n)
229
{
230
    int level, i, j, run;
231
    RLTable *rl              = &ff_rl_mpeg1;
232
    uint8_t *const scantable = s->intra_scantable.permutated;
233
    const int qscale         = s->qscale;
234
235
    {
236
        OPEN_READER(re, &s->gb);
237
        i = -1;
238
        // Special case for first coefficient, no need to add second VLC table.
239
        UPDATE_CACHE(re, &s->gb);
240
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
241
            level = (3 * qscale) >> 1;
242
            level = (level - 1) | 1;
243
            if (GET_CACHE(re, &s->gb) & 0x40000000)
244
                level = -level;
245
            block[0] = level;
246
            i++;
247
            SKIP_BITS(re, &s->gb, 2);
248
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
249
                goto end;
250
        }
251
252
        /* now quantify & encode AC coefficients */
253
        for (;;) {
254
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
255
                       TEX_VLC_BITS, 2, 0);
256
257
            if (level != 0) {
258
                i += run;
259
                if (i > MAX_INDEX)
260
                    break;
261
                j = scantable[i];
262
                level = ((level * 2 + 1) * qscale) >> 1;
263
                level = (level - 1) | 1;
264
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
265
                        SHOW_SBITS(re, &s->gb, 1);
266
                SKIP_BITS(re, &s->gb, 1);
267
            } else {
268
                /* escape */
269
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
270
                LAST_SKIP_BITS(re, &s->gb, 6);
271
                UPDATE_CACHE(re, &s->gb);
272
                level = SHOW_SBITS(re, &s->gb, 8);
273
                SKIP_BITS(re, &s->gb, 8);
274
                if (level == -128) {
275
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
276
                    SKIP_BITS(re, &s->gb, 8);
277
                } else if (level == 0) {
278
                    level = SHOW_UBITS(re, &s->gb, 8);
279
                    SKIP_BITS(re, &s->gb, 8);
280
                }
281
                i += run;
282
                if (i > MAX_INDEX)
283
                    break;
284
                j = scantable[i];
285
                if (level < 0) {
286
                    level = -level;
287
                    level = ((level * 2 + 1) * qscale) >> 1;
288
                    level = (level - 1) | 1;
289
                    level = -level;
290
                } else {
291
                    level = ((level * 2 + 1) * qscale) >> 1;
292
                    level = (level - 1) | 1;
293
                }
294
            }
295
296
            block[j] = level;
297
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
298
                break;
299
            UPDATE_CACHE(re, &s->gb);
300
        }
301
end:
302
        LAST_SKIP_BITS(re, &s->gb, 2);
303
        CLOSE_READER(re, &s->gb);
304
    }
305
306
    check_scantable_index(s, i);
307
308
    s->block_last_index[n] = i;
309
    return 0;
310
}
311
312
3807658
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
313
                                               int16_t *block, int n)
314
{
315
    int level, i, j, run;
316
3807658
    RLTable *rl = &ff_rl_mpeg1;
317
3807658
    uint8_t *const scantable = s->intra_scantable.permutated;
318
    const uint16_t *quant_matrix;
319
3807658
    const int qscale = s->qscale;
320
    int mismatch;
321
322
3807658
    mismatch = 1;
323
324
    {
325
3807658
        OPEN_READER(re, &s->gb);
326
3807658
        i = -1;
327
3807658
        if (n < 4)
328
2868315
            quant_matrix = s->inter_matrix;
329
        else
330
939343
            quant_matrix = s->chroma_inter_matrix;
331
332
        // Special case for first coefficient, no need to add second VLC table.
333
3807658
        UPDATE_CACHE(re, &s->gb);
334
3807658
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
335
1330950
            level = (3 * qscale * quant_matrix[0]) >> 5;
336
1330950
            if (GET_CACHE(re, &s->gb) & 0x40000000)
337
834321
                level = -level;
338
1330950
            block[0]  = level;
339
1330950
            mismatch ^= level;
340
1330950
            i++;
341
1330950
            SKIP_BITS(re, &s->gb, 2);
342
1330950
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
343
604081
                goto end;
344
        }
345
346
        /* now quantify & encode AC coefficients */
347
        for (;;) {
348
15255123
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
349
                       TEX_VLC_BITS, 2, 0);
350
351
15255123
            if (level != 0) {
352
15003427
                i += run;
353
15003427
                if (i > MAX_INDEX)
354
                    break;
355
15003427
                j = scantable[i];
356
15003427
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
357
15003427
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
358
15003427
                        SHOW_SBITS(re, &s->gb, 1);
359
15003427
                SKIP_BITS(re, &s->gb, 1);
360
            } else {
361
                /* escape */
362
251696
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
363
251696
                LAST_SKIP_BITS(re, &s->gb, 6);
364
251696
                UPDATE_CACHE(re, &s->gb);
365
251696
                level = SHOW_SBITS(re, &s->gb, 12);
366
251696
                SKIP_BITS(re, &s->gb, 12);
367
368
251696
                i += run;
369
251696
                if (i > MAX_INDEX)
370
                    break;
371
251696
                j = scantable[i];
372
251696
                if (level < 0) {
373
122825
                    level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
374
122825
                    level = -level;
375
                } else {
376
128871
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
377
                }
378
            }
379
380
15255123
            mismatch ^= level;
381
15255123
            block[j]  = level;
382
15255123
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
383
3203577
                break;
384
12051546
            UPDATE_CACHE(re, &s->gb);
385
        }
386
3807658
end:
387
3807658
        LAST_SKIP_BITS(re, &s->gb, 2);
388
3807658
        CLOSE_READER(re, &s->gb);
389
    }
390
3807658
    block[63] ^= (mismatch & 1);
391
392
3807658
    check_scantable_index(s, i);
393
394
3807658
    s->block_last_index[n] = i;
395
3807658
    return 0;
396
}
397
398
/**
399
 * Note: this function can read out of range and crash for corrupt streams.
400
 * Changing this would eat up any speed benefits it has.
401
 * Do not use "fast" flag if you need the code to be robust.
402
 */
403
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
404
                                                    int16_t *block, int n)
405
{
406
    int level, i, j, run;
407
    RLTable *rl              = &ff_rl_mpeg1;
408
    uint8_t *const scantable = s->intra_scantable.permutated;
409
    const int qscale         = s->qscale;
410
    OPEN_READER(re, &s->gb);
411
    i = -1;
412
413
    // special case for first coefficient, no need to add second VLC table
414
    UPDATE_CACHE(re, &s->gb);
415
    if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416
        level = (3 * qscale) >> 1;
417
        if (GET_CACHE(re, &s->gb) & 0x40000000)
418
            level = -level;
419
        block[0] = level;
420
        i++;
421
        SKIP_BITS(re, &s->gb, 2);
422
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
423
            goto end;
424
    }
425
426
    /* now quantify & encode AC coefficients */
427
    for (;;) {
428
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
429
430
        if (level != 0) {
431
            i += run;
432
            if (i > MAX_INDEX)
433
                break;
434
            j = scantable[i];
435
            level = ((level * 2 + 1) * qscale) >> 1;
436
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
437
                    SHOW_SBITS(re, &s->gb, 1);
438
            SKIP_BITS(re, &s->gb, 1);
439
        } else {
440
            /* escape */
441
            run = SHOW_UBITS(re, &s->gb, 6) + 1;
442
            LAST_SKIP_BITS(re, &s->gb, 6);
443
            UPDATE_CACHE(re, &s->gb);
444
            level = SHOW_SBITS(re, &s->gb, 12);
445
            SKIP_BITS(re, &s->gb, 12);
446
447
            i += run;
448
            if (i > MAX_INDEX)
449
                break;
450
            j = scantable[i];
451
            if (level < 0) {
452
                level = ((-level * 2 + 1) * qscale) >> 1;
453
                level = -level;
454
            } else {
455
                level = ((level * 2 + 1) * qscale) >> 1;
456
            }
457
        }
458
459
        block[j] = level;
460
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
461
            break;
462
463
        UPDATE_CACHE(re, &s->gb);
464
    }
465
end:
466
    LAST_SKIP_BITS(re, &s->gb, 2);
467
    CLOSE_READER(re, &s->gb);
468
469
    check_scantable_index(s, i);
470
471
    s->block_last_index[n] = i;
472
    return 0;
473
}
474
475
1624926
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
476
                                           int16_t *block, int n)
477
{
478
    int level, dc, diff, i, j, run;
479
    int component;
480
    RLTable *rl;
481
1624926
    uint8_t *const scantable = s->intra_scantable.permutated;
482
    const uint16_t *quant_matrix;
483
1624926
    const int qscale = s->qscale;
484
    int mismatch;
485
486
    /* DC coefficient */
487
1624926
    if (n < 4) {
488
1011540
        quant_matrix = s->intra_matrix;
489
1011540
        component    = 0;
490
    } else {
491
613386
        quant_matrix = s->chroma_intra_matrix;
492
613386
        component    = (n & 1) + 1;
493
    }
494
1624926
    diff = decode_dc(&s->gb, component);
495
1624926
    if (diff >= 0xffff)
496
        return AVERROR_INVALIDDATA;
497
1624926
    dc  = s->last_dc[component];
498
1624926
    dc += diff;
499
1624926
    s->last_dc[component] = dc;
500
1624926
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
501
    ff_tlog(s->avctx, "dc=%d\n", block[0]);
502
1624926
    mismatch = block[0] ^ 1;
503
1624926
    i = 0;
504
1624926
    if (s->intra_vlc_format)
505
1039632
        rl = &ff_rl_mpeg2;
506
    else
507
585294
        rl = &ff_rl_mpeg1;
508
509
    {
510
1624926
        OPEN_READER(re, &s->gb);
511
        /* now quantify & encode AC coefficients */
512
        for (;;) {
513
12775088
            UPDATE_CACHE(re, &s->gb);
514
12775088
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
515
                       TEX_VLC_BITS, 2, 0);
516
517
12775088
            if (level == 127) {
518
1624922
                break;
519
11150166
            } else if (level != 0) {
520
11027900
                i += run;
521
11027900
                if (i > MAX_INDEX)
522
4
                    break;
523
11027896
                j = scantable[i];
524
11027896
                level = (level * qscale * quant_matrix[j]) >> 4;
525
11027896
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
526
11027896
                        SHOW_SBITS(re, &s->gb, 1);
527
11027896
                LAST_SKIP_BITS(re, &s->gb, 1);
528
            } else {
529
                /* escape */
530
122266
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
531
122266
                LAST_SKIP_BITS(re, &s->gb, 6);
532
122266
                UPDATE_CACHE(re, &s->gb);
533
122266
                level = SHOW_SBITS(re, &s->gb, 12);
534
122266
                SKIP_BITS(re, &s->gb, 12);
535
122266
                i += run;
536
122266
                if (i > MAX_INDEX)
537
                    break;
538
122266
                j = scantable[i];
539
122266
                if (level < 0) {
540
53361
                    level = (-level * qscale * quant_matrix[j]) >> 4;
541
53361
                    level = -level;
542
                } else {
543
68905
                    level = (level * qscale * quant_matrix[j]) >> 4;
544
                }
545
            }
546
547
11150162
            mismatch ^= level;
548
11150162
            block[j]  = level;
549
        }
550
1624926
        CLOSE_READER(re, &s->gb);
551
    }
552
1624926
    block[63] ^= mismatch & 1;
553
554
1624926
    check_scantable_index(s, i);
555
556
1624922
    s->block_last_index[n] = i;
557
1624922
    return 0;
558
}
559
560
/**
561
 * Note: this function can read out of range and crash for corrupt streams.
562
 * Changing this would eat up any speed benefits it has.
563
 * Do not use "fast" flag if you need the code to be robust.
564
 */
565
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
566
                                                int16_t *block, int n)
567
{
568
    int level, dc, diff, i, j, run;
569
    int component;
570
    RLTable *rl;
571
    uint8_t *const scantable = s->intra_scantable.permutated;
572
    const uint16_t *quant_matrix;
573
    const int qscale = s->qscale;
574
575
    /* DC coefficient */
576
    if (n < 4) {
577
        quant_matrix = s->intra_matrix;
578
        component    = 0;
579
    } else {
580
        quant_matrix = s->chroma_intra_matrix;
581
        component    = (n & 1) + 1;
582
    }
583
    diff = decode_dc(&s->gb, component);
584
    if (diff >= 0xffff)
585
        return AVERROR_INVALIDDATA;
586
    dc = s->last_dc[component];
587
    dc += diff;
588
    s->last_dc[component] = dc;
589
    block[0] = dc << (3 - s->intra_dc_precision);
590
    i = 0;
591
    if (s->intra_vlc_format)
592
        rl = &ff_rl_mpeg2;
593
    else
594
        rl = &ff_rl_mpeg1;
595
596
    {
597
        OPEN_READER(re, &s->gb);
598
        /* now quantify & encode AC coefficients */
599
        for (;;) {
600
            UPDATE_CACHE(re, &s->gb);
601
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
602
                       TEX_VLC_BITS, 2, 0);
603
604
            if (level >= 64 || i > 63) {
605
                break;
606
            } else if (level != 0) {
607
                i += run;
608
                j = scantable[i];
609
                level = (level * qscale * quant_matrix[j]) >> 4;
610
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
611
                        SHOW_SBITS(re, &s->gb, 1);
612
                LAST_SKIP_BITS(re, &s->gb, 1);
613
            } else {
614
                /* escape */
615
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
616
                LAST_SKIP_BITS(re, &s->gb, 6);
617
                UPDATE_CACHE(re, &s->gb);
618
                level = SHOW_SBITS(re, &s->gb, 12);
619
                SKIP_BITS(re, &s->gb, 12);
620
                i += run;
621
                j = scantable[i];
622
                if (level < 0) {
623
                    level = (-level * qscale * quant_matrix[j]) >> 4;
624
                    level = -level;
625
                } else {
626
                    level = (level * qscale * quant_matrix[j]) >> 4;
627
                }
628
            }
629
630
            block[j] = level;
631
        }
632
        CLOSE_READER(re, &s->gb);
633
    }
634
635
    check_scantable_index(s, i);
636
637
    s->block_last_index[n] = i;
638
    return 0;
639
}
640
641
/******************************************/
642
/* decoding */
643
644
30328
static inline int get_dmv(MpegEncContext *s)
645
{
646
30328
    if (get_bits1(&s->gb))
647
28315
        return 1 - (get_bits1(&s->gb) << 1);
648
    else
649
2013
        return 0;
650
}
651
652
/* motion type (for MPEG-2) */
653
#define MT_FIELD 1
654
#define MT_FRAME 2
655
#define MT_16X8  2
656
#define MT_DMV   3
657
658
2059378
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
659
{
660
    int i, j, k, cbp, val, mb_type, motion_type;
661
2059378
    const int mb_block_count = 4 + (1 << s->chroma_format);
662
    int ret;
663
664
    ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
665
666
    av_assert2(s->mb_skipped == 0);
667
668
2059378
    if (s->mb_skip_run-- != 0) {
669
154709
        if (s->pict_type == AV_PICTURE_TYPE_P) {
670
51652
            s->mb_skipped = 1;
671
51652
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
672
                MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
673
        } else {
674
            int mb_type;
675
676
103057
            if (s->mb_x)
677
103057
                mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
678
            else
679
                // FIXME not sure if this is allowed in MPEG at all
680
                mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
681
103057
            if (IS_INTRA(mb_type)) {
682
                av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
683
                return AVERROR_INVALIDDATA;
684
            }
685
103057
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
686
103057
                mb_type | MB_TYPE_SKIP;
687
688
103057
            if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
689
73394
                s->mb_skipped = 1;
690
        }
691
692
154709
        return 0;
693
    }
694
695
1904669
    switch (s->pict_type) {
696
204195
    default:
697
    case AV_PICTURE_TYPE_I:
698
204195
        if (get_bits1(&s->gb) == 0) {
699
16344
            if (get_bits1(&s->gb) == 0) {
700
                av_log(s->avctx, AV_LOG_ERROR,
701
                       "Invalid mb type in I-frame at %d %d\n",
702
                       s->mb_x, s->mb_y);
703
                return AVERROR_INVALIDDATA;
704
            }
705
16344
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
706
        } else {
707
187851
            mb_type = MB_TYPE_INTRA;
708
        }
709
204195
        break;
710
1069428
    case AV_PICTURE_TYPE_P:
711
1069428
        mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
712
1069428
        if (mb_type < 0) {
713
            av_log(s->avctx, AV_LOG_ERROR,
714
                   "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
715
            return AVERROR_INVALIDDATA;
716
        }
717
1069428
        mb_type = ptype2mb_type[mb_type];
718
1069428
        break;
719
631046
    case AV_PICTURE_TYPE_B:
720
631046
        mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
721
631046
        if (mb_type < 0) {
722
            av_log(s->avctx, AV_LOG_ERROR,
723
                   "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
724
            return AVERROR_INVALIDDATA;
725
        }
726
631046
        mb_type = btype2mb_type[mb_type];
727
631046
        break;
728
    }
729
    ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
730
//    motion_type = 0; /* avoid warning */
731
1904669
    if (IS_INTRA(mb_type)) {
732
273908
        s->bdsp.clear_blocks(s->block[0]);
733
734
273908
        if (!s->chroma_y_shift)
735
53810
            s->bdsp.clear_blocks(s->block[6]);
736
737
        /* compute DCT type */
738
        // FIXME: add an interlaced_dct coded var?
739
273908
        if (s->picture_structure == PICT_FRAME &&
740
230337
            !s->frame_pred_frame_dct)
741
96158
            s->interlaced_dct = get_bits1(&s->gb);
742
743
273908
        if (IS_QUANT(mb_type))
744
22653
            s->qscale = mpeg_get_qscale(s);
745
746
273908
        if (s->concealment_motion_vectors) {
747
            /* just parse them */
748
678
            if (s->picture_structure != PICT_FRAME)
749
675
                skip_bits1(&s->gb);  /* field select */
750
751
678
            s->mv[0][0][0]      =
752
678
            s->last_mv[0][0][0] =
753
678
            s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
754
                                                     s->last_mv[0][0][0]);
755
678
            s->mv[0][0][1]      =
756
678
            s->last_mv[0][0][1] =
757
678
            s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
758
                                                     s->last_mv[0][0][1]);
759
760
678
            check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
761
        } else {
762
            /* reset mv prediction */
763
273230
            memset(s->last_mv, 0, sizeof(s->last_mv));
764
        }
765
273908
        s->mb_intra = 1;
766
        // if 1, we memcpy blocks in xvmcvideo
767
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
768
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
769
770
273908
        if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
771
252887
            if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
772
                for (i = 0; i < 6; i++)
773
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
774
            } else {
775
1877809
                for (i = 0; i < mb_block_count; i++)
776
1624926
                    if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
777
4
                        return ret;
778
            }
779
        } else {
780
147147
            for (i = 0; i < 6; i++) {
781
126126
                ret = ff_mpeg1_decode_block_intra(&s->gb,
782
126126
                                                  s->intra_matrix,
783
126126
                                                  s->intra_scantable.permutated,
784
126126
                                                  s->last_dc, *s->pblocks[i],
785
                                                  i, s->qscale);
786
126126
                if (ret < 0) {
787
                    av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
788
                           s->mb_x, s->mb_y);
789
                    return ret;
790
                }
791
792
126126
                s->block_last_index[i] = ret;
793
            }
794
        }
795
    } else {
796
1630761
        if (mb_type & MB_TYPE_ZERO_MV) {
797
            av_assert2(mb_type & MB_TYPE_CBP);
798
799
154462
            s->mv_dir = MV_DIR_FORWARD;
800
154462
            if (s->picture_structure == PICT_FRAME) {
801
64497
                if (s->picture_structure == PICT_FRAME
802
64497
                    && !s->frame_pred_frame_dct)
803
39580
                    s->interlaced_dct = get_bits1(&s->gb);
804
64497
                s->mv_type = MV_TYPE_16X16;
805
            } else {
806
89965
                s->mv_type            = MV_TYPE_FIELD;
807
89965
                mb_type              |= MB_TYPE_INTERLACED;
808
89965
                s->field_select[0][0] = s->picture_structure - 1;
809
            }
810
811
154462
            if (IS_QUANT(mb_type))
812
38251
                s->qscale = mpeg_get_qscale(s);
813
814
154462
            s->last_mv[0][0][0] = 0;
815
154462
            s->last_mv[0][0][1] = 0;
816
154462
            s->last_mv[0][1][0] = 0;
817
154462
            s->last_mv[0][1][1] = 0;
818
154462
            s->mv[0][0][0]      = 0;
819
154462
            s->mv[0][0][1]      = 0;
820
        } else {
821
            av_assert2(mb_type & MB_TYPE_L0L1);
822
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
823
            /* get additional motion vector type */
824

1476299
            if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
825
603374
                motion_type = MT_FRAME;
826
            } else {
827
872925
                motion_type = get_bits(&s->gb, 2);
828

872925
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
829
357276
                    s->interlaced_dct = get_bits1(&s->gb);
830
            }
831
832
1476299
            if (IS_QUANT(mb_type))
833
135734
                s->qscale = mpeg_get_qscale(s);
834
835
            /* motion vectors */
836
1476299
            s->mv_dir = (mb_type >> 13) & 3;
837
            ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
838

1476299
            switch (motion_type) {
839
1236664
            case MT_FRAME: /* or MT_16X8 */
840
1236664
                if (s->picture_structure == PICT_FRAME) {
841
1034164
                    mb_type   |= MB_TYPE_16x16;
842
1034164
                    s->mv_type = MV_TYPE_16X16;
843
3102492
                    for (i = 0; i < 2; i++) {
844
2068328
                        if (USES_LIST(mb_type, i)) {
845
                            /* MT_FRAME */
846
1323224
                            s->mv[i][0][0]      =
847
1323224
                            s->last_mv[i][0][0] =
848
1323224
                            s->last_mv[i][1][0] =
849
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0],
850
                                                   s->last_mv[i][0][0]);
851
1323224
                            s->mv[i][0][1]      =
852
1323224
                            s->last_mv[i][0][1] =
853
1323224
                            s->last_mv[i][1][1] =
854
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1],
855
                                                   s->last_mv[i][0][1]);
856
                            /* full_pel: only for MPEG-1 */
857
1323224
                            if (s->full_pel[i]) {
858
                                s->mv[i][0][0] *= 2;
859
                                s->mv[i][0][1] *= 2;
860
                            }
861
                        }
862
                    }
863
                } else {
864
202500
                    mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
865
202500
                    s->mv_type = MV_TYPE_16X8;
866
607500
                    for (i = 0; i < 2; i++) {
867
405000
                        if (USES_LIST(mb_type, i)) {
868
                            /* MT_16X8 */
869
609543
                            for (j = 0; j < 2; j++) {
870
406362
                                s->field_select[i][j] = get_bits1(&s->gb);
871
1219086
                                for (k = 0; k < 2; k++) {
872
812724
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
873
                                                             s->last_mv[i][j][k]);
874
812724
                                    s->last_mv[i][j][k] = val;
875
812724
                                    s->mv[i][j][k]      = val;
876
                                }
877
                            }
878
                        }
879
                    }
880
                }
881
1236664
                break;
882
224471
            case MT_FIELD:
883
224471
                s->mv_type = MV_TYPE_FIELD;
884
224471
                if (s->picture_structure == PICT_FRAME) {
885
63707
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
886
191121
                    for (i = 0; i < 2; i++) {
887
127414
                        if (USES_LIST(mb_type, i)) {
888
230964
                            for (j = 0; j < 2; j++) {
889
153976
                                s->field_select[i][j] = get_bits1(&s->gb);
890
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
891
                                                         s->last_mv[i][j][0]);
892
153976
                                s->last_mv[i][j][0] = val;
893
153976
                                s->mv[i][j][0]      = val;
894
                                ff_tlog(s->avctx, "fmx=%d\n", val);
895
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
896
153976
                                                         s->last_mv[i][j][1] >> 1);
897
153976
                                s->last_mv[i][j][1] = 2 * val;
898
153976
                                s->mv[i][j][1]      = val;
899
                                ff_tlog(s->avctx, "fmy=%d\n", val);
900
                            }
901
                        }
902
                    }
903
                } else {
904
160764
                    av_assert0(!s->progressive_sequence);
905
160764
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
906
482292
                    for (i = 0; i < 2; i++) {
907
321528
                        if (USES_LIST(mb_type, i)) {
908
165424
                            s->field_select[i][0] = get_bits1(&s->gb);
909
496272
                            for (k = 0; k < 2; k++) {
910
330848
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
911
                                                         s->last_mv[i][0][k]);
912
330848
                                s->last_mv[i][0][k] = val;
913
330848
                                s->last_mv[i][1][k] = val;
914
330848
                                s->mv[i][0][k]      = val;
915
                            }
916
                        }
917
                    }
918
                }
919
224471
                break;
920
15164
            case MT_DMV:
921
15164
                if (s->progressive_sequence){
922
                    av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
923
                    return AVERROR_INVALIDDATA;
924
                }
925
15164
                s->mv_type = MV_TYPE_DMV;
926
45492
                for (i = 0; i < 2; i++) {
927
30328
                    if (USES_LIST(mb_type, i)) {
928
                        int dmx, dmy, mx, my, m;
929
15164
                        const int my_shift = s->picture_structure == PICT_FRAME;
930
931
15164
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
932
                                                s->last_mv[i][0][0]);
933
15164
                        s->last_mv[i][0][0] = mx;
934
15164
                        s->last_mv[i][1][0] = mx;
935
15164
                        dmx = get_dmv(s);
936
15164
                        my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
937
15164
                                                 s->last_mv[i][0][1] >> my_shift);
938
15164
                        dmy = get_dmv(s);
939
940
941
15164
                        s->last_mv[i][0][1] = my * (1 << my_shift);
942
15164
                        s->last_mv[i][1][1] = my * (1 << my_shift);
943
944
15164
                        s->mv[i][0][0] = mx;
945
15164
                        s->mv[i][0][1] = my;
946
15164
                        s->mv[i][1][0] = mx; // not used
947
15164
                        s->mv[i][1][1] = my; // not used
948
949
15164
                        if (s->picture_structure == PICT_FRAME) {
950
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
951
952
                            // m = 1 + 2 * s->top_field_first;
953
                            m = s->top_field_first ? 1 : 3;
954
955
                            /* top -> top pred */
956
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
957
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
958
                            m = 4 - m;
959
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
960
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
961
                        } else {
962
15164
                            mb_type |= MB_TYPE_16x16;
963
964
15164
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
965
15164
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
966
15164
                            if (s->picture_structure == PICT_TOP_FIELD)
967
13048
                                s->mv[i][2][1]--;
968
                            else
969
2116
                                s->mv[i][2][1]++;
970
                        }
971
                    }
972
                }
973
15164
                break;
974
            default:
975
                av_log(s->avctx, AV_LOG_ERROR,
976
                       "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
977
                return AVERROR_INVALIDDATA;
978
            }
979
        }
980
981
1630761
        s->mb_intra = 0;
982
1630761
        if (HAS_CBP(mb_type)) {
983
1295669
            s->bdsp.clear_blocks(s->block[0]);
984
985
1295669
            cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
986
1295669
            if (mb_block_count > 6) {
987
46345
                cbp *= 1 << mb_block_count - 6;
988
46345
                cbp  |= get_bits(&s->gb, mb_block_count - 6);
989
46345
                s->bdsp.clear_blocks(s->block[6]);
990
            }
991
1295669
            if (cbp <= 0) {
992
                av_log(s->avctx, AV_LOG_ERROR,
993
                       "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
994
                return AVERROR_INVALIDDATA;
995
            }
996
997
            // if 1, we memcpy blocks in xvmcvideo
998
            if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
999
                ff_xvmc_pack_pblocks(s, cbp);
1000
1001
1295669
            if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1002
1183927
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1003
                    for (i = 0; i < 6; i++) {
1004
                        if (cbp & 32)
1005
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1006
                        else
1007
                            s->block_last_index[i] = -1;
1008
                        cbp += cbp;
1009
                    }
1010
                } else {
1011
1183927
                    cbp <<= 12 - mb_block_count;
1012
1013
8380179
                    for (i = 0; i < mb_block_count; i++) {
1014
7196252
                        if (cbp & (1 << 11)) {
1015
3807658
                            if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1016
                                return ret;
1017
                        } else {
1018
3388594
                            s->block_last_index[i] = -1;
1019
                        }
1020
7196252
                        cbp += cbp;
1021
                    }
1022
                }
1023
            } else {
1024
111742
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1025
                    for (i = 0; i < 6; i++) {
1026
                        if (cbp & 32)
1027
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1028
                        else
1029
                            s->block_last_index[i] = -1;
1030
                        cbp += cbp;
1031
                    }
1032
                } else {
1033
782194
                    for (i = 0; i < 6; i++) {
1034
670452
                        if (cbp & 32) {
1035
403118
                            if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1036
                                return ret;
1037
                        } else {
1038
267334
                            s->block_last_index[i] = -1;
1039
                        }
1040
670452
                        cbp += cbp;
1041
                    }
1042
                }
1043
            }
1044
        } else {
1045
4356196
            for (i = 0; i < 12; i++)
1046
4021104
                s->block_last_index[i] = -1;
1047
        }
1048
    }
1049
1050
1904665
    s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1051
1052
1904665
    return 0;
1053
}
1054
1055
254
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1056
{
1057
254
    Mpeg1Context *s    = avctx->priv_data;
1058
254
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1059
1060
254
    ff_mpv_decode_defaults(s2);
1061
1062
254
    if (   avctx->codec_tag != AV_RL32("VCR2")
1063
252
        && avctx->codec_tag != AV_RL32("BW10"))
1064
252
        avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1065
254
    ff_mpv_decode_init(s2, avctx);
1066
1067
254
    s->mpeg_enc_ctx.avctx  = avctx;
1068
1069
    /* we need some permutation to store matrices,
1070
     * until the decoder sets the real permutation. */
1071
254
    ff_mpv_idct_init(s2);
1072
254
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1073
254
    ff_mpeg12_init_vlcs();
1074
1075
254
    s2->chroma_format              = 1;
1076
254
    s->mpeg_enc_ctx_allocated      = 0;
1077
254
    s->mpeg_enc_ctx.picture_number = 0;
1078
254
    s->repeat_field                = 0;
1079
254
    s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1080
254
    avctx->color_range             = AVCOL_RANGE_MPEG;
1081
254
    return 0;
1082
}
1083
1084
#if HAVE_THREADS
1085
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1086
                                             const AVCodecContext *avctx_from)
1087
{
1088
    Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1089
    MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1090
    int err;
1091
1092
    if (avctx == avctx_from               ||
1093
        !ctx_from->mpeg_enc_ctx_allocated ||
1094
        !s1->context_initialized)
1095
        return 0;
1096
1097
    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1098
    if (err)
1099
        return err;
1100
1101
    if (!ctx->mpeg_enc_ctx_allocated)
1102
        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1103
1104
    if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1105
        s->picture_number++;
1106
1107
    return 0;
1108
}
1109
#endif
1110
1111
956
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1112
                                 const uint8_t *new_perm)
1113
{
1114
    uint16_t temp_matrix[64];
1115
    int i;
1116
1117
956
    memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1118
1119
62140
    for (i = 0; i < 64; i++)
1120
61184
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1121
956
}
1122
1123
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1124
#if CONFIG_MPEG1_NVDEC_HWACCEL
1125
    AV_PIX_FMT_CUDA,
1126
#endif
1127
#if CONFIG_MPEG1_XVMC_HWACCEL
1128
    AV_PIX_FMT_XVMC,
1129
#endif
1130
#if CONFIG_MPEG1_VDPAU_HWACCEL
1131
    AV_PIX_FMT_VDPAU,
1132
#endif
1133
    AV_PIX_FMT_YUV420P,
1134
    AV_PIX_FMT_NONE
1135
};
1136
1137
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1138
#if CONFIG_MPEG2_NVDEC_HWACCEL
1139
    AV_PIX_FMT_CUDA,
1140
#endif
1141
#if CONFIG_MPEG2_XVMC_HWACCEL
1142
    AV_PIX_FMT_XVMC,
1143
#endif
1144
#if CONFIG_MPEG2_VDPAU_HWACCEL
1145
    AV_PIX_FMT_VDPAU,
1146
#endif
1147
#if CONFIG_MPEG2_DXVA2_HWACCEL
1148
    AV_PIX_FMT_DXVA2_VLD,
1149
#endif
1150
#if CONFIG_MPEG2_D3D11VA_HWACCEL
1151
    AV_PIX_FMT_D3D11VA_VLD,
1152
    AV_PIX_FMT_D3D11,
1153
#endif
1154
#if CONFIG_MPEG2_VAAPI_HWACCEL
1155
    AV_PIX_FMT_VAAPI,
1156
#endif
1157
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1158
    AV_PIX_FMT_VIDEOTOOLBOX,
1159
#endif
1160
    AV_PIX_FMT_YUV420P,
1161
    AV_PIX_FMT_NONE
1162
};
1163
1164
static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1165
    AV_PIX_FMT_YUV422P,
1166
    AV_PIX_FMT_NONE
1167
};
1168
1169
static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1170
    AV_PIX_FMT_YUV444P,
1171
    AV_PIX_FMT_NONE
1172
};
1173
1174
241
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1175
{
1176
241
    Mpeg1Context *s1  = avctx->priv_data;
1177
241
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1178
    const enum AVPixelFormat *pix_fmts;
1179
1180
    if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1181
        return AV_PIX_FMT_GRAY8;
1182
1183
241
    if (s->chroma_format < 2)
1184
185
        pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1185
185
                                mpeg1_hwaccel_pixfmt_list_420 :
1186
                                mpeg2_hwaccel_pixfmt_list_420;
1187
56
    else if (s->chroma_format == 2)
1188
56
        pix_fmts = mpeg12_pixfmt_list_422;
1189
    else
1190
        pix_fmts = mpeg12_pixfmt_list_444;
1191
1192
241
    return ff_thread_get_format(avctx, pix_fmts);
1193
}
1194
1195
241
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1196
{
1197
    // until then pix_fmt may be changed right after codec init
1198
241
    if (avctx->hwaccel)
1199
        if (avctx->idct_algo == FF_IDCT_AUTO)
1200
            avctx->idct_algo = FF_IDCT_NONE;
1201
1202

241
    if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1203
        Mpeg1Context *s1 = avctx->priv_data;
1204
        MpegEncContext *s = &s1->mpeg_enc_ctx;
1205
1206
        s->pack_pblocks = 1;
1207
    }
1208
241
}
1209
1210
/* Call this function when we know all parameters.
1211
 * It may be called in different places for MPEG-1 and MPEG-2. */
1212
4454
static int mpeg_decode_postinit(AVCodecContext *avctx)
1213
{
1214
4454
    Mpeg1Context *s1  = avctx->priv_data;
1215
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1216
    uint8_t old_permutation[64];
1217
    int ret;
1218
1219
4454
    if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1220
        // MPEG-1 aspect
1221
494
        AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1222
494
        avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1223
    } else { // MPEG-2
1224
        // MPEG-2 aspect
1225
3960
        if (s->aspect_ratio_info > 1) {
1226
            AVRational dar =
1227
1947
                av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1228
1947
                                  (AVRational) { s1->pan_scan.width,
1229
1947
                                                 s1->pan_scan.height }),
1230
1947
                         (AVRational) { s->width, s->height });
1231
1232
            /* We ignore the spec here and guess a bit as reality does not
1233
             * match the spec, see for example res_change_ffmpeg_aspect.ts
1234
             * and sequence-display-aspect.mpg.
1235
             * issue1613, 621, 562 */
1236

2239
            if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1237
306
                (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1238
14
                 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1239
1669
                s->avctx->sample_aspect_ratio =
1240
1669
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1241
1669
                             (AVRational) { s->width, s->height });
1242
            } else {
1243
278
                s->avctx->sample_aspect_ratio =
1244
278
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1245
278
                             (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1246
// issue1613 4/3 16/9 -> 16/9
1247
// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1248
// widescreen-issue562.mpg 4/3 16/9 -> 16/9
1249
//                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1250
                ff_dlog(avctx, "aspect A %d/%d\n",
1251
                        ff_mpeg2_aspect[s->aspect_ratio_info].num,
1252
                        ff_mpeg2_aspect[s->aspect_ratio_info].den);
1253
                ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1254
                        s->avctx->sample_aspect_ratio.den);
1255
            }
1256
        } else {
1257
2013
            s->avctx->sample_aspect_ratio =
1258
2013
                ff_mpeg2_aspect[s->aspect_ratio_info];
1259
        }
1260
    } // MPEG-2
1261
1262
4454
    if (av_image_check_sar(s->width, s->height,
1263
                           avctx->sample_aspect_ratio) < 0) {
1264
        av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1265
                avctx->sample_aspect_ratio.num,
1266
                avctx->sample_aspect_ratio.den);
1267
        avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1268
    }
1269
1270
4454
    if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1271
4217
        avctx->coded_width       != s->width                ||
1272
4217
        avctx->coded_height      != s->height               ||
1273
4217
        s1->save_width           != s->width                ||
1274

8434
        s1->save_height          != s->height               ||
1275
4217
        av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1276

4215
        (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1277
        0) {
1278
239
        if (s1->mpeg_enc_ctx_allocated) {
1279
2
            ParseContext pc = s->parse_context;
1280
2
            s->parse_context.buffer = 0;
1281
2
            ff_mpv_common_end(s);
1282
2
            s->parse_context = pc;
1283
2
            s1->mpeg_enc_ctx_allocated = 0;
1284
        }
1285
1286
239
        ret = ff_set_dimensions(avctx, s->width, s->height);
1287
239
        if (ret < 0)
1288
            return ret;
1289
1290

239
        if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1291
212
            avctx->rc_max_rate = s->bit_rate;
1292

27
        } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1293

25
                   (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1294
25
            avctx->bit_rate = s->bit_rate;
1295
        }
1296
239
        s1->save_aspect          = s->avctx->sample_aspect_ratio;
1297
239
        s1->save_width           = s->width;
1298
239
        s1->save_height          = s->height;
1299
239
        s1->save_progressive_seq = s->progressive_sequence;
1300
1301
        /* low_delay may be forced, in this case we will have B-frames
1302
         * that behave like P-frames. */
1303
239
        avctx->has_b_frames = !s->low_delay;
1304
1305
239
        if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1306
            // MPEG-1 fps
1307
25
            avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1308
25
            avctx->ticks_per_frame     = 1;
1309
1310
25
            avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1311
        } else { // MPEG-2
1312
            // MPEG-2 fps
1313
214
            av_reduce(&s->avctx->framerate.num,
1314
214
                      &s->avctx->framerate.den,
1315
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1316
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1317
                      1 << 30);
1318
214
            avctx->ticks_per_frame = 2;
1319
1320
214
            switch (s->chroma_format) {
1321
158
            case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1322
56
            case 2:
1323
56
            case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1324
            default: av_assert0(0);
1325
            }
1326
        } // MPEG-2
1327
1328
239
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1329
239
        setup_hwaccel_for_pixfmt(avctx);
1330
1331
        /* Quantization matrices may need reordering
1332
         * if DCT permutation is changed. */
1333
239
        memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1334
1335
239
        ff_mpv_idct_init(s);
1336
239
        if ((ret = ff_mpv_common_init(s)) < 0)
1337
            return ret;
1338
1339
239
        quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1340
239
        quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1341
239
        quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1342
239
        quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1343
1344
239
        s1->mpeg_enc_ctx_allocated = 1;
1345
    }
1346
4454
    return 0;
1347
}
1348
1349
4454
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1350
                                int buf_size)
1351
{
1352
4454
    Mpeg1Context *s1  = avctx->priv_data;
1353
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1354
    int ref, f_code, vbv_delay;
1355
1356
4454
    init_get_bits(&s->gb, buf, buf_size * 8);
1357
1358
4454
    ref = get_bits(&s->gb, 10); /* temporal ref */
1359
4454
    s->pict_type = get_bits(&s->gb, 3);
1360

4454
    if (s->pict_type == 0 || s->pict_type > 3)
1361
        return AVERROR_INVALIDDATA;
1362
1363
4454
    vbv_delay = get_bits(&s->gb, 16);
1364
4454
    s->vbv_delay = vbv_delay;
1365
4454
    if (s->pict_type == AV_PICTURE_TYPE_P ||
1366
2103
        s->pict_type == AV_PICTURE_TYPE_B) {
1367
3791
        s->full_pel[0] = get_bits1(&s->gb);
1368
3791
        f_code = get_bits(&s->gb, 3);
1369

3791
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1370
            return AVERROR_INVALIDDATA;
1371
3791
        f_code += !f_code;
1372
3791
        s->mpeg_f_code[0][0] = f_code;
1373
3791
        s->mpeg_f_code[0][1] = f_code;
1374
    }
1375
4454
    if (s->pict_type == AV_PICTURE_TYPE_B) {
1376
1440
        s->full_pel[1] = get_bits1(&s->gb);
1377
1440
        f_code = get_bits(&s->gb, 3);
1378

1440
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1379
            return AVERROR_INVALIDDATA;
1380
1440
        f_code += !f_code;
1381
1440
        s->mpeg_f_code[1][0] = f_code;
1382
1440
        s->mpeg_f_code[1][1] = f_code;
1383
    }
1384
4454
    s->current_picture.f->pict_type = s->pict_type;
1385
4454
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1386
1387
4454
    if (avctx->debug & FF_DEBUG_PICT_INFO)
1388
        av_log(avctx, AV_LOG_DEBUG,
1389
               "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1390
1391
4454
    s->y_dc_scale = 8;
1392
4454
    s->c_dc_scale = 8;
1393
4454
    return 0;
1394
}
1395
1396
649
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1397
{
1398
649
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1399
    int horiz_size_ext, vert_size_ext;
1400
    int bit_rate_ext;
1401
1402
649
    skip_bits(&s->gb, 1); /* profile and level esc*/
1403
649
    s->avctx->profile       = get_bits(&s->gb, 3);
1404
649
    s->avctx->level         = get_bits(&s->gb, 4);
1405
649
    s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1406
649
    s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1407
1408
649
    if (!s->chroma_format) {
1409
        s->chroma_format = 1;
1410
        av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1411
    }
1412
1413
649
    horiz_size_ext          = get_bits(&s->gb, 2);
1414
649
    vert_size_ext           = get_bits(&s->gb, 2);
1415
649
    s->width  |= (horiz_size_ext << 12);
1416
649
    s->height |= (vert_size_ext  << 12);
1417
649
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1418
649
    s->bit_rate += (bit_rate_ext << 18) * 400LL;
1419
649
    check_marker(s->avctx, &s->gb, "after bit rate extension");
1420
649
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1421
1422
649
    s->low_delay = get_bits1(&s->gb);
1423
649
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1424
        s->low_delay = 1;
1425
1426
649
    s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1427
649
    s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1428
1429
    ff_dlog(s->avctx, "sequence extension\n");
1430
649
    s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1431
1432
649
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1433
        av_log(s->avctx, AV_LOG_DEBUG,
1434
               "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1435
               s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1436
               s->avctx->rc_buffer_size, s->bit_rate);
1437
649
}
1438
1439
61
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1440
{
1441
61
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1442
    int color_description, w, h;
1443
1444
61
    skip_bits(&s->gb, 3); /* video format */
1445
61
    color_description = get_bits1(&s->gb);
1446
61
    if (color_description) {
1447
29
        s->avctx->color_primaries = get_bits(&s->gb, 8);
1448
29
        s->avctx->color_trc       = get_bits(&s->gb, 8);
1449
29
        s->avctx->colorspace      = get_bits(&s->gb, 8);
1450
    }
1451
61
    w = get_bits(&s->gb, 14);
1452
61
    skip_bits(&s->gb, 1); // marker
1453
61
    h = get_bits(&s->gb, 14);
1454
    // remaining 3 bits are zero padding
1455
1456
61
    s1->pan_scan.width  = 16 * w;
1457
61
    s1->pan_scan.height = 16 * h;
1458
1459
61
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1460
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1461
61
}
1462
1463
15
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1464
{
1465
15
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1466
    int i, nofco;
1467
1468
15
    nofco = 1;
1469
15
    if (s->progressive_sequence) {
1470
        if (s->repeat_first_field) {
1471
            nofco++;
1472
            if (s->top_field_first)
1473
                nofco++;
1474
        }
1475
    } else {
1476
15
        if (s->picture_structure == PICT_FRAME) {
1477
5
            nofco++;
1478
5
            if (s->repeat_first_field)
1479
3
                nofco++;
1480
        }
1481
    }
1482
38
    for (i = 0; i < nofco; i++) {
1483
23
        s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1484
23
        skip_bits(&s->gb, 1); // marker
1485
23
        s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1486
23
        skip_bits(&s->gb, 1); // marker
1487
    }
1488
1489
15
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1490
        av_log(s->avctx, AV_LOG_DEBUG,
1491
               "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1492
               s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1493
               s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1494
               s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1495
15
}
1496
1497
147
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1498
                       uint16_t matrix1[64], int intra)
1499
{
1500
    int i;
1501
1502
9555
    for (i = 0; i < 64; i++) {
1503
9408
        int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1504
9408
        int v = get_bits(&s->gb, 8);
1505
9408
        if (v == 0) {
1506
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1507
            return AVERROR_INVALIDDATA;
1508
        }
1509

9408
        if (intra && i == 0 && v != 8) {
1510
            av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1511
            v = 8; // needed by pink.mpg / issue1046
1512
        }
1513
9408
        matrix0[j] = v;
1514
9408
        if (matrix1)
1515
8960
            matrix1[j] = v;
1516
    }
1517
147
    return 0;
1518
}
1519
1520
692
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1521
{
1522
    ff_dlog(s->avctx, "matrix extension\n");
1523
1524
692
    if (get_bits1(&s->gb))
1525
19
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1526
692
    if (get_bits1(&s->gb))
1527
49
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1528
692
    if (get_bits1(&s->gb))
1529
6
        load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1530
692
    if (get_bits1(&s->gb))
1531
1
        load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1532
692
}
1533
1534
3960
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1535
{
1536
3960
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1537
1538
3960
    s->full_pel[0]       = s->full_pel[1] = 0;
1539
3960
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1540
3960
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1541
3960
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1542
3960
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1543

3960
    if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1544
        av_log(s->avctx, AV_LOG_ERROR,
1545
               "Missing picture start code, guessing missing values\n");
1546
        if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1547
            if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1548
                s->pict_type = AV_PICTURE_TYPE_I;
1549
            else
1550
                s->pict_type = AV_PICTURE_TYPE_P;
1551
        } else
1552
            s->pict_type = AV_PICTURE_TYPE_B;
1553
        s->current_picture.f->pict_type = s->pict_type;
1554
        s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1555
    }
1556
3960
    s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1557
3960
    s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1558
3960
    s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1559
3960
    s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1560
1561
3960
    s->intra_dc_precision         = get_bits(&s->gb, 2);
1562
3960
    s->picture_structure          = get_bits(&s->gb, 2);
1563
3960
    s->top_field_first            = get_bits1(&s->gb);
1564
3960
    s->frame_pred_frame_dct       = get_bits1(&s->gb);
1565
3960
    s->concealment_motion_vectors = get_bits1(&s->gb);
1566
3960
    s->q_scale_type               = get_bits1(&s->gb);
1567
3960
    s->intra_vlc_format           = get_bits1(&s->gb);
1568
3960
    s->alternate_scan             = get_bits1(&s->gb);
1569
3960
    s->repeat_first_field         = get_bits1(&s->gb);
1570
3960
    s->chroma_420_type            = get_bits1(&s->gb);
1571
3960
    s->progressive_frame          = get_bits1(&s->gb);
1572
1573
3960
    if (s->alternate_scan) {
1574
945
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1575
945
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1576
    } else {
1577
3015
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1578
3015
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1579
    }
1580
1581
    /* composite display not parsed */
1582
    ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1583
    ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1584
    ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1585
    ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1586
    ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1587
    ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1588
    ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1589
    ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1590
    ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1591
3960
}
1592
1593
4089
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1594
{
1595
4089
    AVCodecContext *avctx = s->avctx;
1596
4089
    Mpeg1Context *s1      = (Mpeg1Context *) s;
1597
    int ret;
1598
1599
4089
    if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1600
4089
        if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1601
            return AVERROR_INVALIDDATA;
1602
    }
1603
1604
    /* start frame decoding */
1605

7576
    if (s->first_field || s->picture_structure == PICT_FRAME) {
1606
        AVFrameSideData *pan_scan;
1607
1608
3487
        if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1609
            return ret;
1610
1611
3487
        ff_mpeg_er_frame_start(s);
1612
1613
        /* first check if we must repeat the frame */
1614
3487
        s->current_picture_ptr->f->repeat_pict = 0;
1615
3487
        if (s->repeat_first_field) {
1616
3
            if (s->progressive_sequence) {
1617
                if (s->top_field_first)
1618
                    s->current_picture_ptr->f->repeat_pict = 4;
1619
                else
1620
                    s->current_picture_ptr->f->repeat_pict = 2;
1621
3
            } else if (s->progressive_frame) {
1622
3
                s->current_picture_ptr->f->repeat_pict = 1;
1623
            }
1624
        }
1625
1626
3487
        pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1627
                                          AV_FRAME_DATA_PANSCAN,
1628
                                          sizeof(s1->pan_scan));
1629
3487
        if (!pan_scan)
1630
            return AVERROR(ENOMEM);
1631
3487
        memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1632
1633
3487
        if (s1->a53_caption) {
1634
472
            AVFrameSideData *sd = av_frame_new_side_data(
1635
472
                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1636
                s1->a53_caption_size);
1637
472
            if (sd)
1638
472
                memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1639
472
            av_freep(&s1->a53_caption);
1640
        }
1641
1642
3487
        if (s1->has_stereo3d) {
1643
            AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1644
            if (!stereo)
1645
                return AVERROR(ENOMEM);
1646
1647
            *stereo = s1->stereo3d;
1648
            s1->has_stereo3d = 0;
1649
        }
1650
1651
3487
        if (s1->has_afd) {
1652
            AVFrameSideData *sd =
1653
202
                av_frame_new_side_data(s->current_picture_ptr->f,
1654
                                       AV_FRAME_DATA_AFD, 1);
1655
202
            if (!sd)
1656
                return AVERROR(ENOMEM);
1657
1658
202
            *sd->data   = s1->afd;
1659
202
            s1->has_afd = 0;
1660
        }
1661
1662
3487
        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1663
            ff_thread_finish_setup(avctx);
1664
    } else { // second field
1665
        int i;
1666
1667
602
        if (!s->current_picture_ptr) {
1668
            av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1669
            return AVERROR_INVALIDDATA;
1670
        }
1671
1672
602
        if (s->avctx->hwaccel &&
1673
            (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
1674
            if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1675
                av_log(avctx, AV_LOG_ERROR,
1676
                       "hardware accelerator failed to decode first field\n");
1677
                return ret;
1678
            }
1679
        }
1680
1681
3010
        for (i = 0; i < 4; i++) {
1682
2408
            s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1683
2408
            if (s->picture_structure == PICT_BOTTOM_FIELD)
1684
4
                s->current_picture.f->data[i] +=
1685
4
                    s->current_picture_ptr->f->linesize[i];
1686
        }
1687
    }
1688
1689
4089
    if (avctx->hwaccel) {
1690
        if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1691
            return ret;
1692
    }
1693
1694
4089
    return 0;
1695
}
1696
1697
#define DECODE_SLICE_ERROR -1
1698
#define DECODE_SLICE_OK     0
1699
1700
/**
1701
 * Decode a slice.
1702
 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1703
 * @return DECODE_SLICE_ERROR if the slice is damaged,
1704
 *         DECODE_SLICE_OK if this slice is OK
1705
 */
1706
111335
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1707
                             const uint8_t **buf, int buf_size)
1708
{
1709
111335
    AVCodecContext *avctx = s->avctx;
1710
111335
    const int lowres      = s->avctx->lowres;
1711
111335
    const int field_pic   = s->picture_structure != PICT_FRAME;
1712
    int ret;
1713
1714
111335
    s->resync_mb_x =
1715
111335
    s->resync_mb_y = -1;
1716
1717
111335
    av_assert0(mb_y < s->mb_height);
1718
1719
111335
    init_get_bits(&s->gb, *buf, buf_size * 8);
1720

111335
    if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1721
        skip_bits(&s->gb, 3);
1722
1723
111335
    ff_mpeg1_clean_buffers(s);
1724
111335
    s->interlaced_dct = 0;
1725
1726
111335
    s->qscale = mpeg_get_qscale(s);
1727
1728
111335
    if (s->qscale == 0) {
1729
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1730
        return AVERROR_INVALIDDATA;
1731
    }
1732
1733
    /* extra slice info */
1734
111335
    if (skip_1stop_8data_bits(&s->gb) < 0)
1735
        return AVERROR_INVALIDDATA;
1736
1737
111335
    s->mb_x = 0;
1738
1739

111335
    if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1740
        skip_bits1(&s->gb);
1741
    } else {
1742
123534
        while (get_bits_left(&s->gb) > 0) {
1743
123534
            int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1744
                                MBINCR_VLC_BITS, 2);
1745
123534
            if (code < 0) {
1746
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1747
                return AVERROR_INVALIDDATA;
1748
            }
1749
123534
            if (code >= 33) {
1750
12199
                if (code == 33)
1751
12199
                    s->mb_x += 33;
1752
                /* otherwise, stuffing, nothing to do */
1753
            } else {
1754
111335
                s->mb_x += code;
1755
111335
                break;
1756
            }
1757
        }
1758
    }
1759
1760
111335
    if (s->mb_x >= (unsigned) s->mb_width) {
1761
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1762
        return AVERROR_INVALIDDATA;
1763
    }
1764
1765

111335
    if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1766
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1767
        int start_code = -1;
1768
        buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1769
        if (buf_end < *buf + buf_size)
1770
            buf_end -= 4;
1771
        s->mb_y = mb_y;
1772
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1773
            return DECODE_SLICE_ERROR;
1774
        *buf = buf_end;
1775
        return DECODE_SLICE_OK;
1776
    }
1777
1778
111335
    s->resync_mb_x = s->mb_x;
1779
111335
    s->resync_mb_y = s->mb_y = mb_y;
1780
111335
    s->mb_skip_run = 0;
1781
111335
    ff_init_block_index(s);
1782
1783


111335
    if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1784
2886
        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1785
            av_log(s->avctx, AV_LOG_DEBUG,
1786
                   "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1787
                   s->qscale,
1788
                   s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1789
                   s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1790
                   s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1791
                   (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1792
                   (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1793
                   s->progressive_sequence ? "ps"  : "",
1794
                   s->progressive_frame    ? "pf"  : "",
1795
                   s->alternate_scan       ? "alt" : "",
1796
                   s->top_field_first      ? "top" : "",
1797
                   s->intra_dc_precision, s->picture_structure,
1798
                   s->frame_pred_frame_dct, s->concealment_motion_vectors,
1799
                   s->q_scale_type, s->intra_vlc_format,
1800
                   s->repeat_first_field, s->chroma_420_type ? "420" : "");
1801
        }
1802
    }
1803
1804
    for (;;) {
1805
        // If 1, we memcpy blocks in xvmcvideo.
1806
1948043
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1807
            ff_xvmc_init_block(s); // set s->block
1808
1809
2059378
        if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1810
4
            return ret;
1811
1812
        // Note motion_val is normally NULL unless we want to extract the MVs.
1813

2059374
        if (s->current_picture.motion_val[0] && !s->encoding) {
1814
            const int wrap = s->b8_stride;
1815
            int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1816
            int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1817
            int motion_x, motion_y, dir, i;
1818
1819
            for (i = 0; i < 2; i++) {
1820
                for (dir = 0; dir < 2; dir++) {
1821
                    if (s->mb_intra ||
1822
                        (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1823
                        motion_x = motion_y = 0;
1824
                    } else if (s->mv_type == MV_TYPE_16X16 ||
1825
                               (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1826
                        motion_x = s->mv[dir][0][0];
1827
                        motion_y = s->mv[dir][0][1];
1828
                    } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1829
                        motion_x = s->mv[dir][i][0];
1830
                        motion_y = s->mv[dir][i][1];
1831
                    }
1832
1833
                    s->current_picture.motion_val[dir][xy][0]     = motion_x;
1834
                    s->current_picture.motion_val[dir][xy][1]     = motion_y;
1835
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1836
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1837
                    s->current_picture.ref_index [dir][b8_xy]     =
1838
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1839
                    av_assert2(s->field_select[dir][i] == 0 ||
1840
                               s->field_select[dir][i] == 1);
1841
                }
1842
                xy    += wrap;
1843
                b8_xy += 2;
1844
            }
1845
        }
1846
1847
2059374
        s->dest[0] += 16 >> lowres;
1848
2059374
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1849
2059374
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1850
1851
2059374
        ff_mpv_reconstruct_mb(s, s->block);
1852
1853
2059374
        if (++s->mb_x >= s->mb_width) {
1854
66414
            const int mb_size = 16 >> s->avctx->lowres;
1855
            int left;
1856
1857
66414
            ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1858
66414
            ff_mpv_report_decode_progress(s);
1859
1860
66414
            s->mb_x  = 0;
1861
66414
            s->mb_y += 1 << field_pic;
1862
1863
66414
            if (s->mb_y >= s->mb_height) {
1864
4085
                int left   = get_bits_left(&s->gb);
1865
8431
                int is_d10 = s->chroma_format == 2 &&
1866
261
                             s->pict_type == AV_PICTURE_TYPE_I &&
1867

49
                             avctx->profile == 0 && avctx->level == 5 &&
1868
49
                             s->intra_dc_precision == 2 &&
1869

4371
                             s->q_scale_type == 1 && s->alternate_scan == 0 &&
1870
25
                             s->progressive_frame == 0
1871
                             /* vbv_delay == 0xBBB || 0xE10 */;
1872
1873

4085
                if (left >= 32 && !is_d10) {
1874
1002
                    GetBitContext gb = s->gb;
1875
1002
                    align_get_bits(&gb);
1876
1002
                    if (show_bits(&gb, 24) == 0x060E2B) {
1877
                        av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1878
                        is_d10 = 1;
1879
                    }
1880

1002
                    if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1881
                        av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1882
                        goto eos;
1883
                    }
1884
                }
1885
1886

4085
                if (left < 0 ||
1887

3788
                    (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1888

4085
                    ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1889
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1890
                           left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1891
                    return AVERROR_INVALIDDATA;
1892
                } else
1893
4085
                    goto eos;
1894
            }
1895
            // There are some files out there which are missing the last slice
1896
            // in cases where the slice is completely outside the visible
1897
            // area, we detect this here instead of running into the end expecting
1898
            // more data
1899
62329
            left = get_bits_left(&s->gb);
1900
62329
            if (s->mb_y >= ((s->height + 15) >> 4) &&
1901

200
                !s->progressive_sequence &&
1902
                left <= 25 &&
1903
                left >= 0 &&
1904
                s->mb_skip_run == -1 &&
1905
                (!left || show_bits(&s->gb, left) == 0))
1906
                goto eos;
1907
1908
62329
            ff_init_block_index(s);
1909
        }
1910
1911
        /* skip mb handling */
1912
2055289
        if (s->mb_skip_run == -1) {
1913
            /* read increment again */
1914
1900580
            s->mb_skip_run = 0;
1915
1229
            for (;;) {
1916
1901809
                int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1917
                                    MBINCR_VLC_BITS, 2);
1918
1901809
                if (code < 0) {
1919
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1920
                    return AVERROR_INVALIDDATA;
1921
                }
1922
1901809
                if (code >= 33) {
1923
108475
                    if (code == 33) {
1924
1229
                        s->mb_skip_run += 33;
1925
107246
                    } else if (code == 35) {
1926

107246
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1927
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1928
                            return AVERROR_INVALIDDATA;
1929
                        }
1930
107246
                        goto eos; /* end of slice */
1931
                    }
1932
                    /* otherwise, stuffing, nothing to do */
1933
                } else {
1934
1793334
                    s->mb_skip_run += code;
1935
1793334
                    break;
1936
                }
1937
            }
1938
1793334
            if (s->mb_skip_run) {
1939
                int i;
1940
57259
                if (s->pict_type == AV_PICTURE_TYPE_I) {
1941
                    av_log(s->avctx, AV_LOG_ERROR,
1942
                           "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1943
                    return AVERROR_INVALIDDATA;
1944
                }
1945
1946
                /* skip mb */
1947
57259
                s->mb_intra = 0;
1948
744367
                for (i = 0; i < 12; i++)
1949
687108
                    s->block_last_index[i] = -1;
1950
57259
                if (s->picture_structure == PICT_FRAME)
1951
39187
                    s->mv_type = MV_TYPE_16X16;
1952
                else
1953
18072
                    s->mv_type = MV_TYPE_FIELD;
1954
57259
                if (s->pict_type == AV_PICTURE_TYPE_P) {
1955
                    /* if P type, zero motion vector is implied */
1956
20815
                    s->mv_dir             = MV_DIR_FORWARD;
1957
20815
                    s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1958
20815
                    s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1959
20815
                    s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1960
20815
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1961
                } else {
1962
                    /* if B type, reuse previous vectors and directions */
1963
36444
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1964
36444
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1965
36444
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1966
36444
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1967
36444
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1968
36444
                    s->field_select[1][0] = (s->picture_structure - 1) & 1;
1969
                }
1970
            }
1971
        }
1972
    }
1973
111331
eos: // end of slice
1974
111331
    if (get_bits_left(&s->gb) < 0) {
1975
        av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1976
        return AVERROR_INVALIDDATA;
1977
    }
1978
111331
    *buf += (get_bits_count(&s->gb) - 1) / 8;
1979
    ff_dlog(s, "Slice start:%d %d  end:%d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1980
111331
    return 0;
1981
}
1982
1983
4248
static int slice_decode_thread(AVCodecContext *c, void *arg)
1984
{
1985
4248
    MpegEncContext *s   = *(void **) arg;
1986
4248
    const uint8_t *buf  = s->gb.buffer;
1987
4248
    int mb_y            = s->start_mb_y;
1988
4248
    const int field_pic = s->picture_structure != PICT_FRAME;
1989
1990
4248
    s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1991
1992
9912
    for (;;) {
1993
        uint32_t start_code;
1994
        int ret;
1995
1996
14160
        ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1997
14160
        emms_c();
1998
        ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1999
                ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2000
                s->start_mb_y, s->end_mb_y, s->er.error_count);
2001
14160
        if (ret < 0) {
2002
            if (c->err_recognition & AV_EF_EXPLODE)
2003
4248
                return ret;
2004
            if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2005
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2006
                                s->mb_x, s->mb_y,
2007
                                ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2008
        } else {
2009
14160
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2010
14160
                            s->mb_x - 1, s->mb_y,
2011
                            ER_AC_END | ER_DC_END | ER_MV_END);
2012
        }
2013
2014
14160
        if (s->mb_y == s->end_mb_y)
2015
4248
            return 0;
2016
2017
9912
        start_code = -1;
2018
9912
        buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2019

9912
        if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2020
            return AVERROR_INVALIDDATA;
2021
9912
        mb_y       = start_code - SLICE_MIN_START_CODE;
2022

9912
        if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2023
            mb_y += (*buf&0xE0)<<2;
2024
9912
        mb_y <<= field_pic;
2025
9912
        if (s->picture_structure == PICT_BOTTOM_FIELD)
2026
            mb_y++;
2027
9912
        if (mb_y >= s->end_mb_y)
2028
            return AVERROR_INVALIDDATA;
2029
    }
2030
}
2031
2032
/**
2033
 * Handle slice ends.
2034
 * @return 1 if it seems to be the last slice
2035
 */
2036
3747
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2037
{
2038
3747
    Mpeg1Context *s1  = avctx->priv_data;
2039
3747
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2040
2041

3747
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2042
259
        return 0;
2043
2044
3488
    if (s->avctx->hwaccel) {
2045
        int ret = s->avctx->hwaccel->end_frame(s->avctx);
2046
        if (ret < 0) {
2047
            av_log(avctx, AV_LOG_ERROR,
2048
                   "hardware accelerator failed to decode picture\n");
2049
            return ret;
2050
        }
2051
    }
2052
2053
    /* end of slice reached */
2054

3488
    if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2055
        /* end of image */
2056
2057
3487
        ff_er_frame_end(&s->er);
2058
2059
3487
        ff_mpv_frame_end(s);
2060
2061

5160
        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2062
1673
            int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2063
1673
            if (ret < 0)
2064
                return ret;
2065
1673
            ff_print_debug_info(s, s->current_picture_ptr, pict);
2066
1673
            ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2067
        } else {
2068
1814
            if (avctx->active_thread_type & FF_THREAD_FRAME)
2069
                s->picture_number++;
2070
            /* latency of 1 frame for I- and P-frames */
2071
            /* XXX: use another variable than picture_number */
2072
1814
            if (s->last_picture_ptr) {
2073
1755
                int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2074
1755
                if (ret < 0)
2075
                    return ret;
2076
1755
                ff_print_debug_info(s, s->last_picture_ptr, pict);
2077
1755
                ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2078
            }
2079
        }
2080
2081
3487
        return 1;
2082
    } else {
2083
1
        return 0;
2084
    }
2085
}
2086
2087
741
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2088
                                 const uint8_t *buf, int buf_size)
2089
{
2090
741
    Mpeg1Context *s1  = avctx->priv_data;
2091
741
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2092
    int width, height;
2093
    int i, v, j;
2094
2095
741
    init_get_bits(&s->gb, buf, buf_size * 8);
2096
2097
741
    width  = get_bits(&s->gb, 12);
2098
741
    height = get_bits(&s->gb, 12);
2099

741
    if (width == 0 || height == 0) {
2100
        av_log(avctx, AV_LOG_WARNING,
2101
               "Invalid horizontal or vertical size value.\n");
2102
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2103
            return AVERROR_INVALIDDATA;
2104
    }
2105
741
    s->aspect_ratio_info = get_bits(&s->gb, 4);
2106
741
    if (s->aspect_ratio_info == 0) {
2107
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2108
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2109
            return AVERROR_INVALIDDATA;
2110
    }
2111
741
    s->frame_rate_index = get_bits(&s->gb, 4);
2112

741
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2113
        av_log(avctx, AV_LOG_WARNING,
2114
               "frame_rate_index %d is invalid\n", s->frame_rate_index);
2115
        s->frame_rate_index = 1;
2116
    }
2117
741
    s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2118
741
    if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2119
        return AVERROR_INVALIDDATA;
2120
    }
2121
2122
741
    s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2123
741
    skip_bits(&s->gb, 1);
2124
2125
    /* get matrix */
2126
741
    if (get_bits1(&s->gb)) {
2127
18
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2128
    } else {
2129
46995
        for (i = 0; i < 64; i++) {
2130
46272
            j = s->idsp.idct_permutation[i];
2131
46272
            v = ff_mpeg1_default_intra_matrix[i];
2132
46272
            s->intra_matrix[j]        = v;
2133
46272
            s->chroma_intra_matrix[j] = v;
2134
        }
2135
    }
2136
741
    if (get_bits1(&s->gb)) {
2137
54
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2138
    } else {
2139
44655
        for (i = 0; i < 64; i++) {
2140
43968
            int j = s->idsp.idct_permutation[i];
2141
43968
            v = ff_mpeg1_default_non_intra_matrix[i];
2142
43968
            s->inter_matrix[j]        = v;
2143
43968
            s->chroma_inter_matrix[j] = v;
2144
        }
2145
    }
2146
2147
741
    if (show_bits(&s->gb, 23) != 0) {
2148
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2149
        return AVERROR_INVALIDDATA;
2150
    }
2151
2152
741
    s->width  = width;
2153
741
    s->height = height;
2154
2155
    /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2156
741
    s->progressive_sequence = 1;
2157
741
    s->progressive_frame    = 1;
2158
741
    s->picture_structure    = PICT_FRAME;
2159
741
    s->first_field          = 0;
2160
741
    s->frame_pred_frame_dct = 1;
2161
741
    s->chroma_format        = 1;
2162
741
    s->codec_id             =
2163
741
    s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2164
741
    s->out_format           = FMT_MPEG1;
2165
741
    s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2166
741
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2167
        s->low_delay = 1;
2168
2169
741
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2170
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2171
               s->avctx->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2172
2173
741
    return 0;
2174
}
2175
2176
2
static int vcr2_init_sequence(AVCodecContext *avctx)
2177
{
2178
2
    Mpeg1Context *s1  = avctx->priv_data;
2179
2
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2180
    int i, v, ret;
2181
2182
    /* start new MPEG-1 context decoding */
2183
2
    s->out_format = FMT_MPEG1;
2184
2
    if (s1->mpeg_enc_ctx_allocated) {
2185
        ff_mpv_common_end(s);
2186
        s1->mpeg_enc_ctx_allocated = 0;
2187
    }
2188
2
    s->width            = avctx->coded_width;
2189
2
    s->height           = avctx->coded_height;
2190
2
    avctx->has_b_frames = 0; // true?
2191
2
    s->low_delay        = 1;
2192
2193
2
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2194
2
    setup_hwaccel_for_pixfmt(avctx);
2195
2196
2
    ff_mpv_idct_init(s);
2197
2
    if ((ret = ff_mpv_common_init(s)) < 0)
2198
        return ret;
2199
2
    s1->mpeg_enc_ctx_allocated = 1;
2200
2201
130
    for (i = 0; i < 64; i++) {
2202
128
        int j = s->idsp.idct_permutation[i];
2203
128
        v = ff_mpeg1_default_intra_matrix[i];
2204
128
        s->intra_matrix[j]        = v;
2205
128
        s->chroma_intra_matrix[j] = v;
2206
2207
128
        v = ff_mpeg1_default_non_intra_matrix[i];
2208
128
        s->inter_matrix[j]        = v;
2209
128
        s->chroma_inter_matrix[j] = v;
2210
    }
2211
2212
2
    s->progressive_sequence  = 1;
2213
2
    s->progressive_frame     = 1;
2214
2
    s->picture_structure     = PICT_FRAME;
2215
2
    s->first_field           = 0;
2216
2
    s->frame_pred_frame_dct  = 1;
2217
2
    s->chroma_format         = 1;
2218
2
    if (s->codec_tag == AV_RL32("BW10")) {
2219
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2220
    } else {
2221
2
        s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2222
2
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2223
    }
2224
2
    s1->save_width           = s->width;
2225
2
    s1->save_height          = s->height;
2226
2
    s1->save_progressive_seq = s->progressive_sequence;
2227
2
    return 0;
2228
}
2229
2230
525
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2231
                              const uint8_t *p, int buf_size)
2232
{
2233
525
    Mpeg1Context *s1 = avctx->priv_data;
2234
2235
525
    if (buf_size >= 6 &&
2236


525
        p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2237

277
        p[4] == 3 && (p[5] & 0x40)) {
2238
        /* extract A53 Part 4 CC data */
2239
277
        int cc_count = p[5] & 0x1f;
2240

277
        if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2241
277
            av_freep(&s1->a53_caption);
2242
277
            s1->a53_caption_size = cc_count * 3;
2243
277
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
2244
277
            if (!s1->a53_caption) {
2245
                s1->a53_caption_size = 0;
2246
            } else {
2247
277
                memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2248
            }
2249
277
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2250
        }
2251
277
        return 1;
2252
248
    } else if (buf_size >= 2 &&
2253

248
               p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2254
        /* extract SCTE-20 CC data */
2255
        GetBitContext gb;
2256
205
        int cc_count = 0;
2257
        int i;
2258
2259
205
        init_get_bits(&gb, p + 2, buf_size - 2);
2260
205
        cc_count = get_bits(&gb, 5);
2261
205
        if (cc_count > 0) {
2262
205
            av_freep(&s1->a53_caption);
2263
205
            s1->a53_caption_size = cc_count * 3;
2264
205
            s1->a53_caption      = av_mallocz(s1->a53_caption_size);
2265
205
            if (!s1->a53_caption) {
2266
                s1->a53_caption_size = 0;
2267
            } else {
2268
                uint8_t field, cc1, cc2;
2269
205
                uint8_t *cap = s1->a53_caption;
2270

615
                for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2271
410
                    skip_bits(&gb, 2); // priority
2272
410
                    field = get_bits(&gb, 2);
2273
410
                    skip_bits(&gb, 5); // line_offset
2274
410
                    cc1 = get_bits(&gb, 8);
2275
410
                    cc2 = get_bits(&gb, 8);
2276
410
                    skip_bits(&gb, 1); // marker
2277
2278
410
                    if (!field) { // forbidden
2279
                        cap[0] = cap[1] = cap[2] = 0x00;
2280
                    } else {
2281
410
                        field = (field == 2 ? 1 : 0);
2282
410
                        if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2283
410
                        cap[0] = 0x04 | field;
2284
410
                        cap[1] = ff_reverse[cc1];
2285
410
                        cap[2] = ff_reverse[cc2];
2286
                    }
2287
410
                    cap += 3;
2288
                }
2289
            }
2290
205
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2291
        }
2292
205
        return 1;
2293
43
    } else if (buf_size >= 11 &&
2294


43
               p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2295
        /* extract DVD CC data
2296
         *
2297
         * uint32_t   user_data_start_code        0x000001B2    (big endian)
2298
         * uint16_t   user_identifier             0x4343 "CC"
2299
         * uint8_t    user_data_type_code         0x01
2300
         * uint8_t    caption_block_size          0xF8
2301
         * uint8_t
2302
         *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2303
         *   bit 6    caption_filler              0
2304
         *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2305
         *   bit 0    caption_extra_field_added   1=one additional caption word
2306
         *
2307
         * struct caption_field_block {
2308
         *   uint8_t
2309
         *     bit 7:1 caption_filler             0x7F (all 1s)
2310
         *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2311
         *   uint8_t   caption_first_byte
2312
         *   uint8_t   caption_second_byte
2313
         * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2314
         *
2315
         * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2316
         * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2317
         * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2318
         * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2319
         * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2320
        int cc_count = 0;
2321
        int i;
2322
        // There is a caption count field in the data, but it is often
2323
        // incorrect.  So count the number of captions present.
2324
        for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2325
            cc_count++;
2326
        // Transform the DVD format into A53 Part 4 format
2327
        if (cc_count > 0) {
2328
            av_freep(&s1->a53_caption);
2329
            s1->a53_caption_size = cc_count * 6;
2330
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
2331
            if (!s1->a53_caption) {
2332
                s1->a53_caption_size = 0;
2333
            } else {
2334
                uint8_t field1 = !!(p[4] & 0x80);
2335
                uint8_t *cap = s1->a53_caption;
2336
                p += 5;
2337
                for (i = 0; i < cc_count; i++) {
2338
                    cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2339
                    cap[1] = p[1];
2340
                    cap[2] = p[2];
2341
                    cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2342
                    cap[4] = p[4];
2343
                    cap[5] = p[5];
2344
                    cap += 6;
2345
                    p += 6;
2346
                }
2347
            }
2348
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2349
        }
2350
        return 1;
2351
    }
2352
43
    return 0;
2353
}
2354
2355
732
static void mpeg_decode_user_data(AVCodecContext *avctx,
2356
                                  const uint8_t *p, int buf_size)
2357
{
2358
732
    Mpeg1Context *s = avctx->priv_data;
2359
732
    const uint8_t *buf_end = p + buf_size;
2360
732
    Mpeg1Context *s1 = avctx->priv_data;
2361
2362
#if 0
2363
    int i;
2364
    for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2365
        av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2366
    }
2367
    av_log(avctx, AV_LOG_ERROR, "\n");
2368
#endif
2369
2370
732
    if (buf_size > 29){
2371
        int i;
2372
15372
        for(i=0; i<20; i++)
2373
14640
            if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2374
                s->tmpgexs= 1;
2375
            }
2376
    }
2377
    /* we parse the DTG active format information */
2378
732
    if (buf_end - p >= 5 &&
2379


939
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2380
207
        int flags = p[4];
2381
207
        p += 5;
2382
207
        if (flags & 0x80) {
2383
            /* skip event id */
2384
            p += 2;
2385
        }
2386
207
        if (flags & 0x40) {
2387
207
            if (buf_end - p < 1)
2388
                return;
2389
207
            s1->has_afd = 1;
2390
207
            s1->afd     = p[0] & 0x0f;
2391
        }
2392
525
    } else if (buf_end - p >= 6 &&
2393


525
               p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2394
               p[4] == 0x03) { // S3D_video_format_length
2395
        // the 0x7F mask ignores the reserved_bit value
2396
        const uint8_t S3D_video_format_type = p[5] & 0x7F;
2397
2398
        if (S3D_video_format_type == 0x03 ||
2399
            S3D_video_format_type == 0x04 ||
2400
            S3D_video_format_type == 0x08 ||
2401
            S3D_video_format_type == 0x23) {
2402
2403
            s1->has_stereo3d = 1;
2404
2405
            switch (S3D_video_format_type) {
2406
            case 0x03:
2407
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2408
                break;
2409
            case 0x04:
2410
                s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2411
                break;
2412
            case 0x08:
2413
                s1->stereo3d.type = AV_STEREO3D_2D;
2414
                break;
2415
            case 0x23:
2416
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2417
                break;
2418
            }
2419
        }
2420
525
    } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2421
482
        return;
2422
    }
2423
}
2424
2425
513
static void mpeg_decode_gop(AVCodecContext *avctx,
2426
                            const uint8_t *buf, int buf_size)
2427
{
2428
513
    Mpeg1Context *s1  = avctx->priv_data;
2429
513
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2430
    int broken_link;
2431
    int64_t tc;
2432
2433
513
    init_get_bits(&s->gb, buf, buf_size * 8);
2434
2435
513
    tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2436
2437
#if FF_API_PRIVATE_OPT
2438
FF_DISABLE_DEPRECATION_WARNINGS
2439
513
    avctx->timecode_frame_start = tc;
2440
FF_ENABLE_DEPRECATION_WARNINGS
2441
#endif
2442
2443
513
    s->closed_gop = get_bits1(&s->gb);
2444
    /* broken_link indicates that after editing the
2445
     * reference frames of the first B-Frames after GOP I-Frame
2446
     * are missing (open gop) */
2447
513
    broken_link = get_bits1(&s->gb);
2448
2449
513
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2450
        char tcbuf[AV_TIMECODE_STR_SIZE];
2451
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
2452
        av_log(s->avctx, AV_LOG_DEBUG,
2453
               "GOP (%s) closed_gop=%d broken_link=%d\n",
2454
               tcbuf, s->closed_gop, broken_link);
2455
    }
2456
513
}
2457
2458
4141
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2459
                         int *got_output, const uint8_t *buf, int buf_size)
2460
{
2461
4141
    Mpeg1Context *s = avctx->priv_data;
2462
4141
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2463
4141
    const uint8_t *buf_ptr = buf;
2464
4141
    const uint8_t *buf_end = buf + buf_size;
2465
    int ret, input_size;
2466
4141
    int last_code = 0, skip_frame = 0;
2467
4141
    int picture_start_code_seen = 0;
2468
2469
199014
    for (;;) {
2470
        /* find next start code */
2471
203155
        uint32_t start_code = -1;
2472
203155
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2473
203155
        if (start_code > 0x1ff) {
2474
4019
            if (!skip_frame) {
2475
3747
                if (HAVE_THREADS &&
2476
3747
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2477
475
                    !avctx->hwaccel) {
2478
                    int i;
2479
475
                    av_assert0(avctx->thread_count > 1);
2480
2481
475
                    avctx->execute(avctx, slice_decode_thread,
2482
475
                                   &s2->thread_context[0], NULL,
2483
                                   s->slice_count, sizeof(void *));
2484
4723
                    for (i = 0; i < s->slice_count; i++)
2485
4248
                        s2->er.error_count += s2->thread_context[i]->er.error_count;
2486
                }
2487
2488
3747
                ret = slice_end(avctx, picture);
2489
3747
                if (ret < 0)
2490
4141
                    return ret;
2491
3747
                else if (ret) {
2492
                    // FIXME: merge with the stuff in mpeg_decode_slice
2493

3487
                    if (s2->last_picture_ptr || s2->low_delay)
2494
3428
                        *got_output = 1;
2495
                }
2496
            }
2497
4019
            s2->pict_type = 0;
2498
2499

4019
            if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2500
                return AVERROR_INVALIDDATA;
2501
2502
4019
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2503
        }
2504
2505
199136
        input_size = buf_end - buf_ptr;
2506
2507
199136
        if (avctx->debug & FF_DEBUG_STARTCODE)
2508
            av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2509
                   start_code, buf_ptr - buf, input_size);
2510
2511
        /* prepare data for next start code */
2512

199136
        switch (start_code) {
2513
741
        case SEQ_START_CODE:
2514
741
            if (last_code == 0) {
2515
741
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2516
741
                if (buf != avctx->extradata)
2517
504
                    s->sync = 1;
2518
            } else {
2519
                av_log(avctx, AV_LOG_ERROR,
2520
                       "ignoring SEQ_START_CODE after %X\n", last_code);
2521
                if (avctx->err_recognition & AV_EF_EXPLODE)
2522
                    return AVERROR_INVALIDDATA;
2523
            }
2524
741
            break;
2525
2526
4576
        case PICTURE_START_CODE:
2527

4576
            if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2528
               /* If it's a frame picture, there can't be more than one picture header.
2529
                  Yet, it does happen and we need to handle it. */
2530
               av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2531
               break;
2532
            }
2533
4576
            picture_start_code_seen = 1;
2534
2535

4576
            if (s2->width <= 0 || s2->height <= 0) {
2536
122
                av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2537
                       s2->width, s2->height);
2538
122
                return AVERROR_INVALIDDATA;
2539
            }
2540
2541
4454
            if (s->tmpgexs){
2542
                s2->intra_dc_precision= 3;
2543
                s2->intra_matrix[0]= 1;
2544
            }
2545
4454
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2546

478
                !avctx->hwaccel && s->slice_count) {
2547
                int i;
2548
2549
                avctx->execute(avctx, slice_decode_thread,
2550
                               s2->thread_context, NULL,
2551
                               s->slice_count, sizeof(void *));
2552
                for (i = 0; i < s->slice_count; i++)
2553
                    s2->er.error_count += s2->thread_context[i]->er.error_count;
2554
                s->slice_count = 0;
2555
            }
2556

4454
            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2557
4454
                ret = mpeg_decode_postinit(avctx);
2558
4454
                if (ret < 0) {
2559
                    av_log(avctx, AV_LOG_ERROR,
2560
                           "mpeg_decode_postinit() failure\n");
2561
                    return ret;
2562
                }
2563
2564
                /* We have a complete image: we try to decompress it. */
2565
4454
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2566
                    s2->pict_type = 0;
2567
4454
                s->first_slice = 1;
2568
4454
                last_code      = PICTURE_START_CODE;
2569
            } else {
2570
                av_log(avctx, AV_LOG_ERROR,
2571
                       "ignoring pic after %X\n", last_code);
2572
                if (avctx->err_recognition & AV_EF_EXPLODE)
2573
                    return AVERROR_INVALIDDATA;
2574
            }
2575
4454
            break;
2576
5377
        case EXT_START_CODE:
2577
5377
            init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2578
2579
5377
            switch (get_bits(&s2->gb, 4)) {
2580
649
            case 0x1:
2581
649
                if (last_code == 0) {
2582
649
                    mpeg_decode_sequence_extension(s);
2583
                } else {
2584
                    av_log(avctx, AV_LOG_ERROR,
2585
                           "ignoring seq ext after %X\n", last_code);
2586
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2587
                        return AVERROR_INVALIDDATA;
2588
                }
2589
649
                break;
2590
61
            case 0x2:
2591
61
                mpeg_decode_sequence_display_extension(s);
2592
61
                break;
2593
692
            case 0x3:
2594
692
                mpeg_decode_quant_matrix_extension(s2);
2595
692
                break;
2596
15
            case 0x7:
2597
15
                mpeg_decode_picture_display_extension(s);
2598
15
                break;
2599
3960
            case 0x8:
2600
3960
                if (last_code == PICTURE_START_CODE) {
2601
3960
                    mpeg_decode_picture_coding_extension(s);
2602
                } else {
2603
                    av_log(avctx, AV_LOG_ERROR,
2604
                           "ignoring pic cod ext after %X\n", last_code);
2605
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2606
                        return AVERROR_INVALIDDATA;
2607
                }
2608
3960
                break;
2609
            }
2610
5377
            break;
2611
732
        case USER_START_CODE:
2612
732
            mpeg_decode_user_data(avctx, buf_ptr, input_size);
2613
732
            break;
2614
513
        case GOP_START_CODE:
2615
513
            if (last_code == 0) {
2616
513
                s2->first_field = 0;
2617
513
                mpeg_decode_gop(avctx, buf_ptr, input_size);
2618
513
                s->sync = 1;
2619
            } else {
2620
                av_log(avctx, AV_LOG_ERROR,
2621
                       "ignoring GOP_START_CODE after %X\n", last_code);
2622
                if (avctx->err_recognition & AV_EF_EXPLODE)
2623
                    return AVERROR_INVALIDDATA;
2624
            }
2625
513
            break;
2626
187197
        default:
2627
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2628

186651
                start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2629

4454
                if (s2->progressive_sequence && !s2->progressive_frame) {
2630
                    s2->progressive_frame = 1;
2631
                    av_log(s2->avctx, AV_LOG_ERROR,
2632
                           "interlaced frame in progressive sequence, ignoring\n");
2633
                }
2634
2635
4454
                if (s2->picture_structure == 0 ||
2636

4454
                    (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2637
                    av_log(s2->avctx, AV_LOG_ERROR,
2638
                           "picture_structure %d invalid, ignoring\n",
2639
                           s2->picture_structure);
2640
                    s2->picture_structure = PICT_FRAME;
2641
                }
2642
2643

4454
                if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2644
                    av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2645
2646
4454
                if (s2->picture_structure == PICT_FRAME) {
2647
3064
                    s2->first_field = 0;
2648
3064
                    s2->v_edge_pos  = 16 * s2->mb_height;
2649
                } else {
2650
1390
                    s2->first_field ^= 1;
2651
1390
                    s2->v_edge_pos   = 8 * s2->mb_height;
2652
1390
                    memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2653
                }
2654
            }
2655
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2656

186651
                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2657
186507
                const int field_pic = s2->picture_structure != PICT_FRAME;
2658
186507
                int mb_y = start_code - SLICE_MIN_START_CODE;
2659
186507
                last_code = SLICE_MIN_START_CODE;
2660

186507
                if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2661
                    mb_y += (*buf_ptr&0xE0)<<2;
2662
2663
186507
                mb_y <<= field_pic;
2664
186507
                if (s2->picture_structure == PICT_BOTTOM_FIELD)
2665
10341
                    mb_y++;
2666
2667
186507
                if (buf_end - buf_ptr < 2) {
2668
                    av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2669
                    return AVERROR_INVALIDDATA;
2670
                }
2671
2672
186507
                if (mb_y >= s2->mb_height) {
2673
                    av_log(s2->avctx, AV_LOG_ERROR,
2674
                           "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2675
                    return AVERROR_INVALIDDATA;
2676
                }
2677
2678
186507
                if (!s2->last_picture_ptr) {
2679
                    /* Skip B-frames if we do not have reference frames and
2680
                     * GOP is not closed. */
2681
78806
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2682
612
                        if (!s2->closed_gop) {
2683
612
                            skip_frame = 1;
2684
612
                            av_log(s2->avctx, AV_LOG_DEBUG,
2685
                                   "Skipping B slice due to open GOP\n");
2686
612
                            break;
2687
                        }
2688
                    }
2689
                }
2690

185895
                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2691
120936
                    s->sync = 1;
2692
185895
                if (!s2->next_picture_ptr) {
2693
                    /* Skip P-frames if we do not have a reference frame or
2694
                     * we have an invalid header. */
2695

74630
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2696
3060
                        skip_frame = 1;
2697
3060
                        av_log(s2->avctx, AV_LOG_DEBUG,
2698
                               "Skipping P slice due to !sync\n");
2699
3060
                        break;
2700
                    }
2701
                }
2702
182835
                if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2703
71500
                     s2->pict_type == AV_PICTURE_TYPE_B) ||
2704
182835
                    (avctx->skip_frame >= AVDISCARD_NONKEY &&
2705
71500
                     s2->pict_type != AV_PICTURE_TYPE_I) ||
2706
182218
                    avctx->skip_frame >= AVDISCARD_ALL) {
2707
71500
                    skip_frame = 1;
2708
71500
                    break;
2709
                }
2710
2711
111335
                if (!s->mpeg_enc_ctx_allocated)
2712
                    break;
2713
2714
111335
                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2715
104062
                    if (mb_y < avctx->skip_top ||
2716
104062
                        mb_y >= s2->mb_height - avctx->skip_bottom)
2717
                        break;
2718
                }
2719
2720
111335
                if (!s2->pict_type) {
2721
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2722
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2723
                        return AVERROR_INVALIDDATA;
2724
                    break;
2725
                }
2726
2727
111335
                if (s->first_slice) {
2728
4089
                    skip_frame     = 0;
2729
4089
                    s->first_slice = 0;
2730
4089
                    if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2731
                        return ret;
2732
                }
2733
111335
                if (!s2->current_picture_ptr) {
2734
                    av_log(avctx, AV_LOG_ERROR,
2735
                           "current_picture not initialized\n");
2736
                    return AVERROR_INVALIDDATA;
2737
                }
2738
2739
111335
                if (HAVE_THREADS &&
2740
111335
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2741
14160
                    !avctx->hwaccel) {
2742
14160
                    int threshold = (s2->mb_height * s->slice_count +
2743
14160
                                     s2->slice_context_count / 2) /
2744
14160
                                    s2->slice_context_count;
2745
14160
                    av_assert0(avctx->thread_count > 1);
2746
14160
                    if (threshold <= mb_y) {
2747
4248
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2748
2749
4248
                        thread_context->start_mb_y = mb_y;
2750
4248
                        thread_context->end_mb_y   = s2->mb_height;
2751
4248
                        if (s->slice_count) {
2752
3776
                            s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2753
3776
                            ret = ff_update_duplicate_context(thread_context, s2);
2754
3776
                            if (ret < 0)
2755
                                return ret;
2756
                        }
2757
4248
                        init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2758
4248
                        s->slice_count++;
2759
                    }
2760
14160
                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
2761
                } else {
2762
97175
                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2763
97175
                    emms_c();
2764
2765
97175
                    if (ret < 0) {
2766
4
                        if (avctx->err_recognition & AV_EF_EXPLODE)
2767
                            return ret;
2768

4
                        if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2769
4
                            ff_er_add_slice(&s2->er, s2->resync_mb_x,
2770
                                            s2->resync_mb_y, s2->mb_x, s2->mb_y,
2771
                                            ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2772
                    } else {
2773
97171
                        ff_er_add_slice(&s2->er, s2->resync_mb_x,
2774
97171
                                        s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2775
                                        ER_AC_END | ER_DC_END | ER_MV_END);
2776
                    }
2777
                }
2778
            }
2779
112025
            break;
2780
        }
2781
    }
2782
}
2783
2784
4058
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2785
                             int *got_output, AVPacket *avpkt)
2786
{
2787
4058
    const uint8_t *buf = avpkt->data;
2788
    int ret;
2789
4058
    int buf_size = avpkt->size;
2790
4058
    Mpeg1Context *s = avctx->priv_data;
2791
4058
    AVFrame *picture = data;
2792
4058
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2793
2794

4058
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2795
        /* special case for last picture */
2796

129
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
2797
59
            int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2798
59
            if (ret < 0)
2799
                return ret;
2800
2801
59
            s2->next_picture_ptr = NULL;
2802
2803
59
            *got_output = 1;
2804
        }
2805
129
        return buf_size;
2806
    }
2807
2808
3929
    if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2809
49
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2810
                                           buf_size, NULL);
2811
2812
49
        if (ff_combine_frame(&s2->parse_context, next,
2813
                             (const uint8_t **) &buf, &buf_size) < 0)
2814
25
            return buf_size;
2815
    }
2816
2817
3904
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2818

3904
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2819
381
                                           || s2->codec_tag == AV_RL32("BW10")
2820
                                          ))
2821
2
        vcr2_init_sequence(avctx);
2822
2823
3904
    s->slice_count = 0;
2824
2825

3904
    if (avctx->extradata && !s->extradata_decoded) {
2826
237
        ret = decode_chunks(avctx, picture, got_output,
2827
237
                            avctx->extradata, avctx->extradata_size);
2828
237
        if (*got_output) {
2829
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2830
            av_frame_unref(picture);
2831
            *got_output = 0;
2832
        }
2833
237
        s->extradata_decoded = 1;
2834

237
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2835
            s2->current_picture_ptr = NULL;
2836
            return ret;
2837
        }
2838
    }
2839
2840
3904
    ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2841

3904
    if (ret<0 || *got_output) {
2842
3550
        s2->current_picture_ptr = NULL;
2843
2844

3550
        if (s2->timecode_frame_start != -1 && *got_output) {
2845
343
            AVFrameSideData *tcside = av_frame_new_side_data(picture,
2846
                                                             AV_FRAME_DATA_GOP_TIMECODE,
2847
                                                             sizeof(int64_t));
2848
343
            if (!tcside)
2849
                return AVERROR(ENOMEM);
2850
343
            memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2851
2852
343
            s2->timecode_frame_start = -1;
2853
        }
2854
    }
2855
2856
3904
    return ret;
2857
}
2858
2859
static void flush(AVCodecContext *avctx)
2860
{
2861
    Mpeg1Context *s = avctx->priv_data;
2862
2863
    s->sync       = 0;
2864
2865
    ff_mpeg_flush(avctx);
2866
}
2867
2868
254
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2869
{
2870
254
    Mpeg1Context *s = avctx->priv_data;
2871
2872
254
    if (s->mpeg_enc_ctx_allocated)
2873
239
        ff_mpv_common_end(&s->mpeg_enc_ctx);
2874
254
    av_freep(&s->a53_caption);
2875
254
    return 0;
2876
}
2877
2878
AVCodec ff_mpeg1video_decoder = {
2879
    .name                  = "mpeg1video",
2880
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2881
    .type                  = AVMEDIA_TYPE_VIDEO,
2882
    .id                    = AV_CODEC_ID_MPEG1VIDEO,
2883
    .priv_data_size        = sizeof(Mpeg1Context),
2884
    .init                  = mpeg_decode_init,
2885
    .close                 = mpeg_decode_end,
2886
    .decode                = mpeg_decode_frame,
2887
    .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2888
                             AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2889
                             AV_CODEC_CAP_SLICE_THREADS,
2890
    .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2891
    .flush                 = flush,
2892
    .max_lowres            = 3,
2893
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2894
    .hw_configs            = (const AVCodecHWConfigInternal*[]) {
2895
#if CONFIG_MPEG1_NVDEC_HWACCEL
2896
                               HWACCEL_NVDEC(mpeg1),
2897
#endif
2898
#if CONFIG_MPEG1_VDPAU_HWACCEL
2899
                               HWACCEL_VDPAU(mpeg1),
2900
#endif
2901
#if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2902
                               HWACCEL_VIDEOTOOLBOX(mpeg1),
2903
#endif
2904
#if CONFIG_MPEG1_XVMC_HWACCEL
2905
                               HWACCEL_XVMC(mpeg1),
2906
#endif
2907
                               NULL
2908
                           },
2909
};
2910
2911
AVCodec ff_mpeg2video_decoder = {
2912
    .name           = "mpeg2video",
2913
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2914
    .type           = AVMEDIA_TYPE_VIDEO,
2915
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2916
    .priv_data_size = sizeof(Mpeg1Context),
2917
    .init           = mpeg_decode_init,
2918
    .close          = mpeg_decode_end,
2919
    .decode         = mpeg_decode_frame,
2920
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2921
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2922
                      AV_CODEC_CAP_SLICE_THREADS,
2923
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2924
    .flush          = flush,
2925
    .max_lowres     = 3,
2926
    .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2927
    .hw_configs     = (const AVCodecHWConfigInternal*[]) {
2928
#if CONFIG_MPEG2_DXVA2_HWACCEL
2929
                        HWACCEL_DXVA2(mpeg2),
2930
#endif
2931
#if CONFIG_MPEG2_D3D11VA_HWACCEL
2932
                        HWACCEL_D3D11VA(mpeg2),
2933
#endif
2934
#if CONFIG_MPEG2_D3D11VA2_HWACCEL
2935
                        HWACCEL_D3D11VA2(mpeg2),
2936
#endif
2937
#if CONFIG_MPEG2_NVDEC_HWACCEL
2938
                        HWACCEL_NVDEC(mpeg2),
2939
#endif
2940
#if CONFIG_MPEG2_VAAPI_HWACCEL
2941
                        HWACCEL_VAAPI(mpeg2),
2942
#endif
2943
#if CONFIG_MPEG2_VDPAU_HWACCEL
2944
                        HWACCEL_VDPAU(mpeg2),
2945
#endif
2946
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2947
                        HWACCEL_VIDEOTOOLBOX(mpeg2),
2948
#endif
2949
#if CONFIG_MPEG2_XVMC_HWACCEL
2950
                        HWACCEL_XVMC(mpeg2),
2951
#endif
2952
                        NULL
2953
                    },
2954
};
2955
2956
//legacy decoder
2957
AVCodec ff_mpegvideo_decoder = {
2958
    .name           = "mpegvideo",
2959
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2960
    .type           = AVMEDIA_TYPE_VIDEO,
2961
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2962
    .priv_data_size = sizeof(Mpeg1Context),
2963
    .init           = mpeg_decode_init,
2964
    .close          = mpeg_decode_end,
2965
    .decode         = mpeg_decode_frame,
2966
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2967
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2968
    .flush          = flush,
2969
    .max_lowres     = 3,
2970
};