GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpeg12dec.c Lines: 1172 1665 70.4 %
Date: 2020-04-02 05:41:20 Branches: 639 1097 58.2 %

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
    int rc_buffer_size;
68
    AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
69
    int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
70
    int tmpgexs;
71
    int first_slice;
72
    int extradata_decoded;
73
} Mpeg1Context;
74
75
#define MB_TYPE_ZERO_MV   0x20000000
76
77
static const uint32_t ptype2mb_type[7] = {
78
                    MB_TYPE_INTRA,
79
                    MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
80
                    MB_TYPE_L0,
81
                    MB_TYPE_L0 | MB_TYPE_CBP,
82
    MB_TYPE_QUANT | MB_TYPE_INTRA,
83
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
84
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
85
};
86
87
static const uint32_t btype2mb_type[11] = {
88
                    MB_TYPE_INTRA,
89
                    MB_TYPE_L1,
90
                    MB_TYPE_L1   | MB_TYPE_CBP,
91
                    MB_TYPE_L0,
92
                    MB_TYPE_L0   | MB_TYPE_CBP,
93
                    MB_TYPE_L0L1,
94
                    MB_TYPE_L0L1 | MB_TYPE_CBP,
95
    MB_TYPE_QUANT | MB_TYPE_INTRA,
96
    MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
97
    MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
98
    MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
99
};
100
101
/* as H.263, but only 17 codes */
102
4129656
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
103
{
104
    int code, sign, val, shift;
105
106
4129656
    code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
107
4129656
    if (code == 0)
108
1684185
        return pred;
109
2445471
    if (code < 0)
110
        return 0xffff;
111
112
2445471
    sign  = get_bits1(&s->gb);
113
2445471
    shift = fcode - 1;
114
2445471
    val   = code;
115
2445471
    if (shift) {
116
2103529
        val  = (val - 1) << shift;
117
2103529
        val |= get_bits(&s->gb, shift);
118
2103529
        val++;
119
    }
120
2445471
    if (sign)
121
1265834
        val = -val;
122
2445471
    val += pred;
123
124
    /* modulo decoding */
125
2445471
    return sign_extend(val, 5 + shift);
126
}
127
128
#define MAX_INDEX (64 - 1)
129
#define check_scantable_index(ctx, x)                                         \
130
    do {                                                                      \
131
        if ((x) > MAX_INDEX) {                                                \
132
            av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
133
                   ctx->mb_x, ctx->mb_y);                                     \
134
            return AVERROR_INVALIDDATA;                                       \
135
        }                                                                     \
136
    } while (0)
137
138
403118
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
139
                                           int16_t *block, int n)
140
{
141
    int level, i, j, run;
142
403118
    RLTable *rl                  = &ff_rl_mpeg1;
143
403118
    uint8_t *const scantable     = s->intra_scantable.permutated;
144
403118
    const uint16_t *quant_matrix = s->inter_matrix;
145
403118
    const int qscale             = s->qscale;
146
147
    {
148
403118
        OPEN_READER(re, &s->gb);
149
403118
        i = -1;
150
        // special case for first coefficient, no need to add second VLC table
151
403118
        UPDATE_CACHE(re, &s->gb);
152
403118
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
153
101724
            level = (3 * qscale * quant_matrix[0]) >> 5;
154
101724
            level = (level - 1) | 1;
155
101724
            if (GET_CACHE(re, &s->gb) & 0x40000000)
156
56898
                level = -level;
157
101724
            block[0] = level;
158
101724
            i++;
159
101724
            SKIP_BITS(re, &s->gb, 2);
160
101724
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
161
34285
                goto end;
162
        }
163
        /* now quantify & encode AC coefficients */
164
        for (;;) {
165
2921408
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
166
                       TEX_VLC_BITS, 2, 0);
167
168
2921408
            if (level != 0) {
169
2842322
                i += run;
170
2842322
                if (i > MAX_INDEX)
171
                    break;
172
2842322
                j = scantable[i];
173
2842322
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
174
2842322
                level = (level - 1) | 1;
175
2842322
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
176
2842322
                        SHOW_SBITS(re, &s->gb, 1);
177
2842322
                SKIP_BITS(re, &s->gb, 1);
178
            } else {
179
                /* escape */
180
79086
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
181
79086
                LAST_SKIP_BITS(re, &s->gb, 6);
182
79086
                UPDATE_CACHE(re, &s->gb);
183
79086
                level = SHOW_SBITS(re, &s->gb, 8);
184
79086
                SKIP_BITS(re, &s->gb, 8);
185
79086
                if (level == -128) {
186
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
187
                    SKIP_BITS(re, &s->gb, 8);
188
79086
                } else if (level == 0) {
189
                    level = SHOW_UBITS(re, &s->gb, 8);
190
                    SKIP_BITS(re, &s->gb, 8);
191
                }
192
79086
                i += run;
193
79086
                if (i > MAX_INDEX)
194
                    break;
195
79086
                j = scantable[i];
196
79086
                if (level < 0) {
197
38919
                    level = -level;
198
38919
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
199
38919
                    level = (level - 1) | 1;
200
38919
                    level = -level;
201
                } else {
202
40167
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
203
40167
                    level = (level - 1) | 1;
204
                }
205
            }
206
207
2921408
            block[j] = level;
208
2921408
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
209
368833
                break;
210
2552575
            UPDATE_CACHE(re, &s->gb);
211
        }
212
403118
end:
213
403118
        LAST_SKIP_BITS(re, &s->gb, 2);
214
403118
        CLOSE_READER(re, &s->gb);
215
    }
216
217
403118
    check_scantable_index(s, i);
218
219
403118
    s->block_last_index[n] = i;
220
403118
    return 0;
221
}
222
223
/**
224
 * Note: this function can read out of range and crash for corrupt streams.
225
 * Changing this would eat up any speed benefits it has.
226
 * Do not use "fast" flag if you need the code to be robust.
227
 */
228
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
229
                                                int16_t *block, int n)
230
{
231
    int level, i, j, run;
232
    RLTable *rl              = &ff_rl_mpeg1;
233
    uint8_t *const scantable = s->intra_scantable.permutated;
234
    const int qscale         = s->qscale;
235
236
    {
237
        OPEN_READER(re, &s->gb);
238
        i = -1;
239
        // Special case for first coefficient, no need to add second VLC table.
240
        UPDATE_CACHE(re, &s->gb);
241
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
242
            level = (3 * qscale) >> 1;
243
            level = (level - 1) | 1;
244
            if (GET_CACHE(re, &s->gb) & 0x40000000)
245
                level = -level;
246
            block[0] = level;
247
            i++;
248
            SKIP_BITS(re, &s->gb, 2);
249
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
250
                goto end;
251
        }
252
253
        /* now quantify & encode AC coefficients */
254
        for (;;) {
255
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
256
                       TEX_VLC_BITS, 2, 0);
257
258
            if (level != 0) {
259
                i += run;
260
                if (i > MAX_INDEX)
261
                    break;
262
                j = scantable[i];
263
                level = ((level * 2 + 1) * qscale) >> 1;
264
                level = (level - 1) | 1;
265
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
266
                        SHOW_SBITS(re, &s->gb, 1);
267
                SKIP_BITS(re, &s->gb, 1);
268
            } else {
269
                /* escape */
270
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
271
                LAST_SKIP_BITS(re, &s->gb, 6);
272
                UPDATE_CACHE(re, &s->gb);
273
                level = SHOW_SBITS(re, &s->gb, 8);
274
                SKIP_BITS(re, &s->gb, 8);
275
                if (level == -128) {
276
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
277
                    SKIP_BITS(re, &s->gb, 8);
278
                } else if (level == 0) {
279
                    level = SHOW_UBITS(re, &s->gb, 8);
280
                    SKIP_BITS(re, &s->gb, 8);
281
                }
282
                i += run;
283
                if (i > MAX_INDEX)
284
                    break;
285
                j = scantable[i];
286
                if (level < 0) {
287
                    level = -level;
288
                    level = ((level * 2 + 1) * qscale) >> 1;
289
                    level = (level - 1) | 1;
290
                    level = -level;
291
                } else {
292
                    level = ((level * 2 + 1) * qscale) >> 1;
293
                    level = (level - 1) | 1;
294
                }
295
            }
296
297
            block[j] = level;
298
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
299
                break;
300
            UPDATE_CACHE(re, &s->gb);
301
        }
302
end:
303
        LAST_SKIP_BITS(re, &s->gb, 2);
304
        CLOSE_READER(re, &s->gb);
305
    }
306
307
    check_scantable_index(s, i);
308
309
    s->block_last_index[n] = i;
310
    return 0;
311
}
312
313
3807658
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
314
                                               int16_t *block, int n)
315
{
316
    int level, i, j, run;
317
3807658
    RLTable *rl = &ff_rl_mpeg1;
318
3807658
    uint8_t *const scantable = s->intra_scantable.permutated;
319
    const uint16_t *quant_matrix;
320
3807658
    const int qscale = s->qscale;
321
    int mismatch;
322
323
3807658
    mismatch = 1;
324
325
    {
326
3807658
        OPEN_READER(re, &s->gb);
327
3807658
        i = -1;
328
3807658
        if (n < 4)
329
2868315
            quant_matrix = s->inter_matrix;
330
        else
331
939343
            quant_matrix = s->chroma_inter_matrix;
332
333
        // Special case for first coefficient, no need to add second VLC table.
334
3807658
        UPDATE_CACHE(re, &s->gb);
335
3807658
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
336
1330950
            level = (3 * qscale * quant_matrix[0]) >> 5;
337
1330950
            if (GET_CACHE(re, &s->gb) & 0x40000000)
338
834321
                level = -level;
339
1330950
            block[0]  = level;
340
1330950
            mismatch ^= level;
341
1330950
            i++;
342
1330950
            SKIP_BITS(re, &s->gb, 2);
343
1330950
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
344
604081
                goto end;
345
        }
346
347
        /* now quantify & encode AC coefficients */
348
        for (;;) {
349
15255123
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
350
                       TEX_VLC_BITS, 2, 0);
351
352
15255123
            if (level != 0) {
353
15003427
                i += run;
354
15003427
                if (i > MAX_INDEX)
355
                    break;
356
15003427
                j = scantable[i];
357
15003427
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
358
15003427
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
359
15003427
                        SHOW_SBITS(re, &s->gb, 1);
360
15003427
                SKIP_BITS(re, &s->gb, 1);
361
            } else {
362
                /* escape */
363
251696
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
364
251696
                LAST_SKIP_BITS(re, &s->gb, 6);
365
251696
                UPDATE_CACHE(re, &s->gb);
366
251696
                level = SHOW_SBITS(re, &s->gb, 12);
367
251696
                SKIP_BITS(re, &s->gb, 12);
368
369
251696
                i += run;
370
251696
                if (i > MAX_INDEX)
371
                    break;
372
251696
                j = scantable[i];
373
251696
                if (level < 0) {
374
122825
                    level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
375
122825
                    level = -level;
376
                } else {
377
128871
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
378
                }
379
            }
380
381
15255123
            mismatch ^= level;
382
15255123
            block[j]  = level;
383
15255123
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
384
3203577
                break;
385
12051546
            UPDATE_CACHE(re, &s->gb);
386
        }
387
3807658
end:
388
3807658
        LAST_SKIP_BITS(re, &s->gb, 2);
389
3807658
        CLOSE_READER(re, &s->gb);
390
    }
391
3807658
    block[63] ^= (mismatch & 1);
392
393
3807658
    check_scantable_index(s, i);
394
395
3807658
    s->block_last_index[n] = i;
396
3807658
    return 0;
397
}
398
399
/**
400
 * Note: this function can read out of range and crash for corrupt streams.
401
 * Changing this would eat up any speed benefits it has.
402
 * Do not use "fast" flag if you need the code to be robust.
403
 */
404
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
405
                                                    int16_t *block, int n)
406
{
407
    int level, i, j, run;
408
    RLTable *rl              = &ff_rl_mpeg1;
409
    uint8_t *const scantable = s->intra_scantable.permutated;
410
    const int qscale         = s->qscale;
411
    OPEN_READER(re, &s->gb);
412
    i = -1;
413
414
    // special case for first coefficient, no need to add second VLC table
415
    UPDATE_CACHE(re, &s->gb);
416
    if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
417
        level = (3 * qscale) >> 1;
418
        if (GET_CACHE(re, &s->gb) & 0x40000000)
419
            level = -level;
420
        block[0] = level;
421
        i++;
422
        SKIP_BITS(re, &s->gb, 2);
423
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
424
            goto end;
425
    }
426
427
    /* now quantify & encode AC coefficients */
428
    for (;;) {
429
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
430
431
        if (level != 0) {
432
            i += run;
433
            if (i > MAX_INDEX)
434
                break;
435
            j = scantable[i];
436
            level = ((level * 2 + 1) * qscale) >> 1;
437
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
438
                    SHOW_SBITS(re, &s->gb, 1);
439
            SKIP_BITS(re, &s->gb, 1);
440
        } else {
441
            /* escape */
442
            run = SHOW_UBITS(re, &s->gb, 6) + 1;
443
            LAST_SKIP_BITS(re, &s->gb, 6);
444
            UPDATE_CACHE(re, &s->gb);
445
            level = SHOW_SBITS(re, &s->gb, 12);
446
            SKIP_BITS(re, &s->gb, 12);
447
448
            i += run;
449
            if (i > MAX_INDEX)
450
                break;
451
            j = scantable[i];
452
            if (level < 0) {
453
                level = ((-level * 2 + 1) * qscale) >> 1;
454
                level = -level;
455
            } else {
456
                level = ((level * 2 + 1) * qscale) >> 1;
457
            }
458
        }
459
460
        block[j] = level;
461
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
462
            break;
463
464
        UPDATE_CACHE(re, &s->gb);
465
    }
466
end:
467
    LAST_SKIP_BITS(re, &s->gb, 2);
468
    CLOSE_READER(re, &s->gb);
469
470
    check_scantable_index(s, i);
471
472
    s->block_last_index[n] = i;
473
    return 0;
474
}
475
476
1624926
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
477
                                           int16_t *block, int n)
478
{
479
    int level, dc, diff, i, j, run;
480
    int component;
481
    RLTable *rl;
482
1624926
    uint8_t *const scantable = s->intra_scantable.permutated;
483
    const uint16_t *quant_matrix;
484
1624926
    const int qscale = s->qscale;
485
    int mismatch;
486
487
    /* DC coefficient */
488
1624926
    if (n < 4) {
489
1011540
        quant_matrix = s->intra_matrix;
490
1011540
        component    = 0;
491
    } else {
492
613386
        quant_matrix = s->chroma_intra_matrix;
493
613386
        component    = (n & 1) + 1;
494
    }
495
1624926
    diff = decode_dc(&s->gb, component);
496
1624926
    if (diff >= 0xffff)
497
        return AVERROR_INVALIDDATA;
498
1624926
    dc  = s->last_dc[component];
499
1624926
    dc += diff;
500
1624926
    s->last_dc[component] = dc;
501
1624926
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
502
    ff_tlog(s->avctx, "dc=%d\n", block[0]);
503
1624926
    mismatch = block[0] ^ 1;
504
1624926
    i = 0;
505
1624926
    if (s->intra_vlc_format)
506
1039632
        rl = &ff_rl_mpeg2;
507
    else
508
585294
        rl = &ff_rl_mpeg1;
509
510
    {
511
1624926
        OPEN_READER(re, &s->gb);
512
        /* now quantify & encode AC coefficients */
513
        for (;;) {
514
12775088
            UPDATE_CACHE(re, &s->gb);
515
12775088
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
516
                       TEX_VLC_BITS, 2, 0);
517
518
12775088
            if (level == 127) {
519
1624922
                break;
520
11150166
            } else if (level != 0) {
521
11027900
                i += run;
522
11027900
                if (i > MAX_INDEX)
523
4
                    break;
524
11027896
                j = scantable[i];
525
11027896
                level = (level * qscale * quant_matrix[j]) >> 4;
526
11027896
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
527
11027896
                        SHOW_SBITS(re, &s->gb, 1);
528
11027896
                LAST_SKIP_BITS(re, &s->gb, 1);
529
            } else {
530
                /* escape */
531
122266
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
532
122266
                LAST_SKIP_BITS(re, &s->gb, 6);
533
122266
                UPDATE_CACHE(re, &s->gb);
534
122266
                level = SHOW_SBITS(re, &s->gb, 12);
535
122266
                SKIP_BITS(re, &s->gb, 12);
536
122266
                i += run;
537
122266
                if (i > MAX_INDEX)
538
                    break;
539
122266
                j = scantable[i];
540
122266
                if (level < 0) {
541
53361
                    level = (-level * qscale * quant_matrix[j]) >> 4;
542
53361
                    level = -level;
543
                } else {
544
68905
                    level = (level * qscale * quant_matrix[j]) >> 4;
545
                }
546
            }
547
548
11150162
            mismatch ^= level;
549
11150162
            block[j]  = level;
550
        }
551
1624926
        CLOSE_READER(re, &s->gb);
552
    }
553
1624926
    block[63] ^= mismatch & 1;
554
555
1624926
    check_scantable_index(s, i);
556
557
1624922
    s->block_last_index[n] = i;
558
1624922
    return 0;
559
}
560
561
/**
562
 * Note: this function can read out of range and crash for corrupt streams.
563
 * Changing this would eat up any speed benefits it has.
564
 * Do not use "fast" flag if you need the code to be robust.
565
 */
566
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
567
                                                int16_t *block, int n)
568
{
569
    int level, dc, diff, i, j, run;
570
    int component;
571
    RLTable *rl;
572
    uint8_t *const scantable = s->intra_scantable.permutated;
573
    const uint16_t *quant_matrix;
574
    const int qscale = s->qscale;
575
576
    /* DC coefficient */
577
    if (n < 4) {
578
        quant_matrix = s->intra_matrix;
579
        component    = 0;
580
    } else {
581
        quant_matrix = s->chroma_intra_matrix;
582
        component    = (n & 1) + 1;
583
    }
584
    diff = decode_dc(&s->gb, component);
585
    if (diff >= 0xffff)
586
        return AVERROR_INVALIDDATA;
587
    dc = s->last_dc[component];
588
    dc += diff;
589
    s->last_dc[component] = dc;
590
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
591
    i = 0;
592
    if (s->intra_vlc_format)
593
        rl = &ff_rl_mpeg2;
594
    else
595
        rl = &ff_rl_mpeg1;
596
597
    {
598
        OPEN_READER(re, &s->gb);
599
        /* now quantify & encode AC coefficients */
600
        for (;;) {
601
            UPDATE_CACHE(re, &s->gb);
602
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
603
                       TEX_VLC_BITS, 2, 0);
604
605
            if (level >= 64 || i > 63) {
606
                break;
607
            } else if (level != 0) {
608
                i += run;
609
                j = scantable[i];
610
                level = (level * qscale * quant_matrix[j]) >> 4;
611
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
612
                        SHOW_SBITS(re, &s->gb, 1);
613
                LAST_SKIP_BITS(re, &s->gb, 1);
614
            } else {
615
                /* escape */
616
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
617
                LAST_SKIP_BITS(re, &s->gb, 6);
618
                UPDATE_CACHE(re, &s->gb);
619
                level = SHOW_SBITS(re, &s->gb, 12);
620
                SKIP_BITS(re, &s->gb, 12);
621
                i += run;
622
                j = scantable[i];
623
                if (level < 0) {
624
                    level = (-level * qscale * quant_matrix[j]) >> 4;
625
                    level = -level;
626
                } else {
627
                    level = (level * qscale * quant_matrix[j]) >> 4;
628
                }
629
            }
630
631
            block[j] = level;
632
        }
633
        CLOSE_READER(re, &s->gb);
634
    }
635
636
    check_scantable_index(s, i);
637
638
    s->block_last_index[n] = i;
639
    return 0;
640
}
641
642
/******************************************/
643
/* decoding */
644
645
30328
static inline int get_dmv(MpegEncContext *s)
646
{
647
30328
    if (get_bits1(&s->gb))
648
28315
        return 1 - (get_bits1(&s->gb) << 1);
649
    else
650
2013
        return 0;
651
}
652
653
/* motion type (for MPEG-2) */
654
#define MT_FIELD 1
655
#define MT_FRAME 2
656
#define MT_16X8  2
657
#define MT_DMV   3
658
659
2059378
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
660
{
661
    int i, j, k, cbp, val, mb_type, motion_type;
662
2059378
    const int mb_block_count = 4 + (1 << s->chroma_format);
663
    int ret;
664
665
    ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
666
667
    av_assert2(s->mb_skipped == 0);
668
669
2059378
    if (s->mb_skip_run-- != 0) {
670
154709
        if (s->pict_type == AV_PICTURE_TYPE_P) {
671
51652
            s->mb_skipped = 1;
672
51652
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
673
                MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
674
        } else {
675
            int mb_type;
676
677
103057
            if (s->mb_x)
678
103057
                mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
679
            else
680
                // FIXME not sure if this is allowed in MPEG at all
681
                mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
682
103057
            if (IS_INTRA(mb_type)) {
683
                av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
684
                return AVERROR_INVALIDDATA;
685
            }
686
103057
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
687
103057
                mb_type | MB_TYPE_SKIP;
688
689
103057
            if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
690
73394
                s->mb_skipped = 1;
691
        }
692
693
154709
        return 0;
694
    }
695
696
1904669
    switch (s->pict_type) {
697
204195
    default:
698
    case AV_PICTURE_TYPE_I:
699
204195
        if (get_bits1(&s->gb) == 0) {
700
16344
            if (get_bits1(&s->gb) == 0) {
701
                av_log(s->avctx, AV_LOG_ERROR,
702
                       "Invalid mb type in I-frame at %d %d\n",
703
                       s->mb_x, s->mb_y);
704
                return AVERROR_INVALIDDATA;
705
            }
706
16344
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
707
        } else {
708
187851
            mb_type = MB_TYPE_INTRA;
709
        }
710
204195
        break;
711
1069428
    case AV_PICTURE_TYPE_P:
712
1069428
        mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
713
1069428
        if (mb_type < 0) {
714
            av_log(s->avctx, AV_LOG_ERROR,
715
                   "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
716
            return AVERROR_INVALIDDATA;
717
        }
718
1069428
        mb_type = ptype2mb_type[mb_type];
719
1069428
        break;
720
631046
    case AV_PICTURE_TYPE_B:
721
631046
        mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
722
631046
        if (mb_type < 0) {
723
            av_log(s->avctx, AV_LOG_ERROR,
724
                   "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
725
            return AVERROR_INVALIDDATA;
726
        }
727
631046
        mb_type = btype2mb_type[mb_type];
728
631046
        break;
729
    }
730
    ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
731
//    motion_type = 0; /* avoid warning */
732
1904669
    if (IS_INTRA(mb_type)) {
733
273908
        s->bdsp.clear_blocks(s->block[0]);
734
735
273908
        if (!s->chroma_y_shift)
736
53810
            s->bdsp.clear_blocks(s->block[6]);
737
738
        /* compute DCT type */
739
        // FIXME: add an interlaced_dct coded var?
740
273908
        if (s->picture_structure == PICT_FRAME &&
741
230337
            !s->frame_pred_frame_dct)
742
96158
            s->interlaced_dct = get_bits1(&s->gb);
743
744
273908
        if (IS_QUANT(mb_type))
745
22653
            s->qscale = mpeg_get_qscale(s);
746
747
273908
        if (s->concealment_motion_vectors) {
748
            /* just parse them */
749
678
            if (s->picture_structure != PICT_FRAME)
750
675
                skip_bits1(&s->gb);  /* field select */
751
752
678
            s->mv[0][0][0]      =
753
678
            s->last_mv[0][0][0] =
754
678
            s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
755
                                                     s->last_mv[0][0][0]);
756
678
            s->mv[0][0][1]      =
757
678
            s->last_mv[0][0][1] =
758
678
            s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
759
                                                     s->last_mv[0][0][1]);
760
761
678
            check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
762
        } else {
763
            /* reset mv prediction */
764
273230
            memset(s->last_mv, 0, sizeof(s->last_mv));
765
        }
766
273908
        s->mb_intra = 1;
767
        // if 1, we memcpy blocks in xvmcvideo
768
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
769
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
770
771
273908
        if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
772
252887
            if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
773
                for (i = 0; i < 6; i++)
774
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
775
            } else {
776
1877809
                for (i = 0; i < mb_block_count; i++)
777
1624926
                    if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
778
4
                        return ret;
779
            }
780
        } else {
781
147147
            for (i = 0; i < 6; i++) {
782
126126
                ret = ff_mpeg1_decode_block_intra(&s->gb,
783
126126
                                                  s->intra_matrix,
784
126126
                                                  s->intra_scantable.permutated,
785
126126
                                                  s->last_dc, *s->pblocks[i],
786
                                                  i, s->qscale);
787
126126
                if (ret < 0) {
788
                    av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
789
                           s->mb_x, s->mb_y);
790
                    return ret;
791
                }
792
793
126126
                s->block_last_index[i] = ret;
794
            }
795
        }
796
    } else {
797
1630761
        if (mb_type & MB_TYPE_ZERO_MV) {
798
            av_assert2(mb_type & MB_TYPE_CBP);
799
800
154462
            s->mv_dir = MV_DIR_FORWARD;
801
154462
            if (s->picture_structure == PICT_FRAME) {
802
64497
                if (s->picture_structure == PICT_FRAME
803
64497
                    && !s->frame_pred_frame_dct)
804
39580
                    s->interlaced_dct = get_bits1(&s->gb);
805
64497
                s->mv_type = MV_TYPE_16X16;
806
            } else {
807
89965
                s->mv_type            = MV_TYPE_FIELD;
808
89965
                mb_type              |= MB_TYPE_INTERLACED;
809
89965
                s->field_select[0][0] = s->picture_structure - 1;
810
            }
811
812
154462
            if (IS_QUANT(mb_type))
813
38251
                s->qscale = mpeg_get_qscale(s);
814
815
154462
            s->last_mv[0][0][0] = 0;
816
154462
            s->last_mv[0][0][1] = 0;
817
154462
            s->last_mv[0][1][0] = 0;
818
154462
            s->last_mv[0][1][1] = 0;
819
154462
            s->mv[0][0][0]      = 0;
820
154462
            s->mv[0][0][1]      = 0;
821
        } else {
822
            av_assert2(mb_type & MB_TYPE_L0L1);
823
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
824
            /* get additional motion vector type */
825

1476299
            if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
826
603374
                motion_type = MT_FRAME;
827
            } else {
828
872925
                motion_type = get_bits(&s->gb, 2);
829

872925
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
830
357276
                    s->interlaced_dct = get_bits1(&s->gb);
831
            }
832
833
1476299
            if (IS_QUANT(mb_type))
834
135734
                s->qscale = mpeg_get_qscale(s);
835
836
            /* motion vectors */
837
1476299
            s->mv_dir = (mb_type >> 13) & 3;
838
            ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
839

1476299
            switch (motion_type) {
840
1236664
            case MT_FRAME: /* or MT_16X8 */
841
1236664
                if (s->picture_structure == PICT_FRAME) {
842
1034164
                    mb_type   |= MB_TYPE_16x16;
843
1034164
                    s->mv_type = MV_TYPE_16X16;
844
3102492
                    for (i = 0; i < 2; i++) {
845
2068328
                        if (USES_LIST(mb_type, i)) {
846
                            /* MT_FRAME */
847
1323224
                            s->mv[i][0][0]      =
848
1323224
                            s->last_mv[i][0][0] =
849
1323224
                            s->last_mv[i][1][0] =
850
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0],
851
                                                   s->last_mv[i][0][0]);
852
1323224
                            s->mv[i][0][1]      =
853
1323224
                            s->last_mv[i][0][1] =
854
1323224
                            s->last_mv[i][1][1] =
855
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1],
856
                                                   s->last_mv[i][0][1]);
857
                            /* full_pel: only for MPEG-1 */
858
1323224
                            if (s->full_pel[i]) {
859
                                s->mv[i][0][0] *= 2;
860
                                s->mv[i][0][1] *= 2;
861
                            }
862
                        }
863
                    }
864
                } else {
865
202500
                    mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
866
202500
                    s->mv_type = MV_TYPE_16X8;
867
607500
                    for (i = 0; i < 2; i++) {
868
405000
                        if (USES_LIST(mb_type, i)) {
869
                            /* MT_16X8 */
870
609543
                            for (j = 0; j < 2; j++) {
871
406362
                                s->field_select[i][j] = get_bits1(&s->gb);
872
1219086
                                for (k = 0; k < 2; k++) {
873
812724
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
874
                                                             s->last_mv[i][j][k]);
875
812724
                                    s->last_mv[i][j][k] = val;
876
812724
                                    s->mv[i][j][k]      = val;
877
                                }
878
                            }
879
                        }
880
                    }
881
                }
882
1236664
                break;
883
224471
            case MT_FIELD:
884
224471
                s->mv_type = MV_TYPE_FIELD;
885
224471
                if (s->picture_structure == PICT_FRAME) {
886
63707
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
887
191121
                    for (i = 0; i < 2; i++) {
888
127414
                        if (USES_LIST(mb_type, i)) {
889
230964
                            for (j = 0; j < 2; j++) {
890
153976
                                s->field_select[i][j] = get_bits1(&s->gb);
891
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
892
                                                         s->last_mv[i][j][0]);
893
153976
                                s->last_mv[i][j][0] = val;
894
153976
                                s->mv[i][j][0]      = val;
895
                                ff_tlog(s->avctx, "fmx=%d\n", val);
896
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
897
153976
                                                         s->last_mv[i][j][1] >> 1);
898
153976
                                s->last_mv[i][j][1] = 2 * val;
899
153976
                                s->mv[i][j][1]      = val;
900
                                ff_tlog(s->avctx, "fmy=%d\n", val);
901
                            }
902
                        }
903
                    }
904
                } else {
905
160764
                    av_assert0(!s->progressive_sequence);
906
160764
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
907
482292
                    for (i = 0; i < 2; i++) {
908
321528
                        if (USES_LIST(mb_type, i)) {
909
165424
                            s->field_select[i][0] = get_bits1(&s->gb);
910
496272
                            for (k = 0; k < 2; k++) {
911
330848
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
912
                                                         s->last_mv[i][0][k]);
913
330848
                                s->last_mv[i][0][k] = val;
914
330848
                                s->last_mv[i][1][k] = val;
915
330848
                                s->mv[i][0][k]      = val;
916
                            }
917
                        }
918
                    }
919
                }
920
224471
                break;
921
15164
            case MT_DMV:
922
15164
                if (s->progressive_sequence){
923
                    av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
924
                    return AVERROR_INVALIDDATA;
925
                }
926
15164
                s->mv_type = MV_TYPE_DMV;
927
45492
                for (i = 0; i < 2; i++) {
928
30328
                    if (USES_LIST(mb_type, i)) {
929
                        int dmx, dmy, mx, my, m;
930
15164
                        const int my_shift = s->picture_structure == PICT_FRAME;
931
932
15164
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
933
                                                s->last_mv[i][0][0]);
934
15164
                        s->last_mv[i][0][0] = mx;
935
15164
                        s->last_mv[i][1][0] = mx;
936
15164
                        dmx = get_dmv(s);
937
15164
                        my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
938
15164
                                                 s->last_mv[i][0][1] >> my_shift);
939
15164
                        dmy = get_dmv(s);
940
941
942
15164
                        s->last_mv[i][0][1] = my * (1 << my_shift);
943
15164
                        s->last_mv[i][1][1] = my * (1 << my_shift);
944
945
15164
                        s->mv[i][0][0] = mx;
946
15164
                        s->mv[i][0][1] = my;
947
15164
                        s->mv[i][1][0] = mx; // not used
948
15164
                        s->mv[i][1][1] = my; // not used
949
950
15164
                        if (s->picture_structure == PICT_FRAME) {
951
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
952
953
                            // m = 1 + 2 * s->top_field_first;
954
                            m = s->top_field_first ? 1 : 3;
955
956
                            /* top -> top pred */
957
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
958
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
959
                            m = 4 - m;
960
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
961
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
962
                        } else {
963
15164
                            mb_type |= MB_TYPE_16x16;
964
965
15164
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
966
15164
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
967
15164
                            if (s->picture_structure == PICT_TOP_FIELD)
968
13048
                                s->mv[i][2][1]--;
969
                            else
970
2116
                                s->mv[i][2][1]++;
971
                        }
972
                    }
973
                }
974
15164
                break;
975
            default:
976
                av_log(s->avctx, AV_LOG_ERROR,
977
                       "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
978
                return AVERROR_INVALIDDATA;
979
            }
980
        }
981
982
1630761
        s->mb_intra = 0;
983
1630761
        if (HAS_CBP(mb_type)) {
984
1295669
            s->bdsp.clear_blocks(s->block[0]);
985
986
1295669
            cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
987
1295669
            if (mb_block_count > 6) {
988
46345
                cbp *= 1 << mb_block_count - 6;
989
46345
                cbp  |= get_bits(&s->gb, mb_block_count - 6);
990
46345
                s->bdsp.clear_blocks(s->block[6]);
991
            }
992
1295669
            if (cbp <= 0) {
993
                av_log(s->avctx, AV_LOG_ERROR,
994
                       "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
995
                return AVERROR_INVALIDDATA;
996
            }
997
998
            // if 1, we memcpy blocks in xvmcvideo
999
            if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1000
                ff_xvmc_pack_pblocks(s, cbp);
1001
1002
1295669
            if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1003
1183927
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1004
                    for (i = 0; i < 6; i++) {
1005
                        if (cbp & 32)
1006
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1007
                        else
1008
                            s->block_last_index[i] = -1;
1009
                        cbp += cbp;
1010
                    }
1011
                } else {
1012
1183927
                    cbp <<= 12 - mb_block_count;
1013
1014
8380179
                    for (i = 0; i < mb_block_count; i++) {
1015
7196252
                        if (cbp & (1 << 11)) {
1016
3807658
                            if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1017
                                return ret;
1018
                        } else {
1019
3388594
                            s->block_last_index[i] = -1;
1020
                        }
1021
7196252
                        cbp += cbp;
1022
                    }
1023
                }
1024
            } else {
1025
111742
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1026
                    for (i = 0; i < 6; i++) {
1027
                        if (cbp & 32)
1028
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1029
                        else
1030
                            s->block_last_index[i] = -1;
1031
                        cbp += cbp;
1032
                    }
1033
                } else {
1034
782194
                    for (i = 0; i < 6; i++) {
1035
670452
                        if (cbp & 32) {
1036
403118
                            if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1037
                                return ret;
1038
                        } else {
1039
267334
                            s->block_last_index[i] = -1;
1040
                        }
1041
670452
                        cbp += cbp;
1042
                    }
1043
                }
1044
            }
1045
        } else {
1046
4356196
            for (i = 0; i < 12; i++)
1047
4021104
                s->block_last_index[i] = -1;
1048
        }
1049
    }
1050
1051
1904665
    s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1052
1053
1904665
    return 0;
1054
}
1055
1056
254
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1057
{
1058
254
    Mpeg1Context *s    = avctx->priv_data;
1059
254
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1060
1061
254
    ff_mpv_decode_defaults(s2);
1062
1063
254
    if (   avctx->codec_tag != AV_RL32("VCR2")
1064
252
        && avctx->codec_tag != AV_RL32("BW10"))
1065
252
        avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1066
254
    ff_mpv_decode_init(s2, avctx);
1067
1068
254
    s->mpeg_enc_ctx.avctx  = avctx;
1069
1070
    /* we need some permutation to store matrices,
1071
     * until the decoder sets the real permutation. */
1072
254
    ff_mpv_idct_init(s2);
1073
254
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1074
254
    ff_mpeg12_init_vlcs();
1075
1076
254
    s2->chroma_format              = 1;
1077
254
    s->mpeg_enc_ctx_allocated      = 0;
1078
254
    s->mpeg_enc_ctx.picture_number = 0;
1079
254
    s->repeat_field                = 0;
1080
254
    s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1081
254
    avctx->color_range             = AVCOL_RANGE_MPEG;
1082
254
    return 0;
1083
}
1084
1085
#if HAVE_THREADS
1086
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1087
                                             const AVCodecContext *avctx_from)
1088
{
1089
    Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1090
    MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1091
    int err;
1092
1093
    if (avctx == avctx_from               ||
1094
        !ctx_from->mpeg_enc_ctx_allocated ||
1095
        !s1->context_initialized)
1096
        return 0;
1097
1098
    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1099
    if (err)
1100
        return err;
1101
1102
    if (!ctx->mpeg_enc_ctx_allocated)
1103
        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1104
1105
    if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1106
        s->picture_number++;
1107
1108
    return 0;
1109
}
1110
#endif
1111
1112
956
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1113
                                 const uint8_t *new_perm)
1114
{
1115
    uint16_t temp_matrix[64];
1116
    int i;
1117
1118
956
    memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1119
1120
62140
    for (i = 0; i < 64; i++)
1121
61184
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1122
956
}
1123
1124
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1125
#if CONFIG_MPEG1_NVDEC_HWACCEL
1126
    AV_PIX_FMT_CUDA,
1127
#endif
1128
#if CONFIG_MPEG1_XVMC_HWACCEL
1129
    AV_PIX_FMT_XVMC,
1130
#endif
1131
#if CONFIG_MPEG1_VDPAU_HWACCEL
1132
    AV_PIX_FMT_VDPAU,
1133
#endif
1134
    AV_PIX_FMT_YUV420P,
1135
    AV_PIX_FMT_NONE
1136
};
1137
1138
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1139
#if CONFIG_MPEG2_NVDEC_HWACCEL
1140
    AV_PIX_FMT_CUDA,
1141
#endif
1142
#if CONFIG_MPEG2_XVMC_HWACCEL
1143
    AV_PIX_FMT_XVMC,
1144
#endif
1145
#if CONFIG_MPEG2_VDPAU_HWACCEL
1146
    AV_PIX_FMT_VDPAU,
1147
#endif
1148
#if CONFIG_MPEG2_DXVA2_HWACCEL
1149
    AV_PIX_FMT_DXVA2_VLD,
1150
#endif
1151
#if CONFIG_MPEG2_D3D11VA_HWACCEL
1152
    AV_PIX_FMT_D3D11VA_VLD,
1153
    AV_PIX_FMT_D3D11,
1154
#endif
1155
#if CONFIG_MPEG2_VAAPI_HWACCEL
1156
    AV_PIX_FMT_VAAPI,
1157
#endif
1158
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1159
    AV_PIX_FMT_VIDEOTOOLBOX,
1160
#endif
1161
    AV_PIX_FMT_YUV420P,
1162
    AV_PIX_FMT_NONE
1163
};
1164
1165
static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1166
    AV_PIX_FMT_YUV422P,
1167
    AV_PIX_FMT_NONE
1168
};
1169
1170
static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1171
    AV_PIX_FMT_YUV444P,
1172
    AV_PIX_FMT_NONE
1173
};
1174
1175
241
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1176
{
1177
241
    Mpeg1Context *s1  = avctx->priv_data;
1178
241
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1179
    const enum AVPixelFormat *pix_fmts;
1180
1181
    if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1182
        return AV_PIX_FMT_GRAY8;
1183
1184
241
    if (s->chroma_format < 2)
1185
185
        pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1186
185
                                mpeg1_hwaccel_pixfmt_list_420 :
1187
                                mpeg2_hwaccel_pixfmt_list_420;
1188
56
    else if (s->chroma_format == 2)
1189
56
        pix_fmts = mpeg12_pixfmt_list_422;
1190
    else
1191
        pix_fmts = mpeg12_pixfmt_list_444;
1192
1193
241
    return ff_thread_get_format(avctx, pix_fmts);
1194
}
1195
1196
241
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1197
{
1198
    // until then pix_fmt may be changed right after codec init
1199
241
    if (avctx->hwaccel)
1200
        if (avctx->idct_algo == FF_IDCT_AUTO)
1201
            avctx->idct_algo = FF_IDCT_NONE;
1202
1203

241
    if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1204
        Mpeg1Context *s1 = avctx->priv_data;
1205
        MpegEncContext *s = &s1->mpeg_enc_ctx;
1206
1207
        s->pack_pblocks = 1;
1208
    }
1209
241
}
1210
1211
/* Call this function when we know all parameters.
1212
 * It may be called in different places for MPEG-1 and MPEG-2. */
1213
4454
static int mpeg_decode_postinit(AVCodecContext *avctx)
1214
{
1215
4454
    Mpeg1Context *s1  = avctx->priv_data;
1216
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1217
    uint8_t old_permutation[64];
1218
    int ret;
1219
1220
4454
    if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1221
        // MPEG-1 aspect
1222
494
        AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1223
494
        avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1224
    } else { // MPEG-2
1225
        // MPEG-2 aspect
1226
3960
        if (s->aspect_ratio_info > 1) {
1227
            AVRational dar =
1228
1947
                av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1229
1947
                                  (AVRational) { s1->pan_scan.width,
1230
1947
                                                 s1->pan_scan.height }),
1231
1947
                         (AVRational) { s->width, s->height });
1232
1233
            /* We ignore the spec here and guess a bit as reality does not
1234
             * match the spec, see for example res_change_ffmpeg_aspect.ts
1235
             * and sequence-display-aspect.mpg.
1236
             * issue1613, 621, 562 */
1237

2239
            if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1238
306
                (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1239
14
                 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1240
1669
                s->avctx->sample_aspect_ratio =
1241
1669
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1242
1669
                             (AVRational) { s->width, s->height });
1243
            } else {
1244
278
                s->avctx->sample_aspect_ratio =
1245
278
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1246
278
                             (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1247
// issue1613 4/3 16/9 -> 16/9
1248
// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1249
// widescreen-issue562.mpg 4/3 16/9 -> 16/9
1250
//                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1251
                ff_dlog(avctx, "aspect A %d/%d\n",
1252
                        ff_mpeg2_aspect[s->aspect_ratio_info].num,
1253
                        ff_mpeg2_aspect[s->aspect_ratio_info].den);
1254
                ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1255
                        s->avctx->sample_aspect_ratio.den);
1256
            }
1257
        } else {
1258
2013
            s->avctx->sample_aspect_ratio =
1259
2013
                ff_mpeg2_aspect[s->aspect_ratio_info];
1260
        }
1261
    } // MPEG-2
1262
1263
4454
    if (av_image_check_sar(s->width, s->height,
1264
                           avctx->sample_aspect_ratio) < 0) {
1265
        av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1266
                avctx->sample_aspect_ratio.num,
1267
                avctx->sample_aspect_ratio.den);
1268
        avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1269
    }
1270
1271
4454
    if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1272
4217
        avctx->coded_width       != s->width                ||
1273
4217
        avctx->coded_height      != s->height               ||
1274
4217
        s1->save_width           != s->width                ||
1275

8434
        s1->save_height          != s->height               ||
1276
4217
        av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1277

4215
        (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1278
        0) {
1279
239
        if (s1->mpeg_enc_ctx_allocated) {
1280
2
            ParseContext pc = s->parse_context;
1281
2
            s->parse_context.buffer = 0;
1282
2
            ff_mpv_common_end(s);
1283
2
            s->parse_context = pc;
1284
2
            s1->mpeg_enc_ctx_allocated = 0;
1285
        }
1286
1287
239
        ret = ff_set_dimensions(avctx, s->width, s->height);
1288
239
        if (ret < 0)
1289
            return ret;
1290
1291

239
        if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1292
212
            avctx->rc_max_rate = s->bit_rate;
1293

27
        } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1294

25
                   (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1295
25
            avctx->bit_rate = s->bit_rate;
1296
        }
1297
239
        s1->save_aspect          = s->avctx->sample_aspect_ratio;
1298
239
        s1->save_width           = s->width;
1299
239
        s1->save_height          = s->height;
1300
239
        s1->save_progressive_seq = s->progressive_sequence;
1301
1302
        /* low_delay may be forced, in this case we will have B-frames
1303
         * that behave like P-frames. */
1304
239
        avctx->has_b_frames = !s->low_delay;
1305
1306
239
        if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1307
            // MPEG-1 fps
1308
25
            avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1309
25
            avctx->ticks_per_frame     = 1;
1310
1311
25
            avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1312
        } else { // MPEG-2
1313
            // MPEG-2 fps
1314
214
            av_reduce(&s->avctx->framerate.num,
1315
214
                      &s->avctx->framerate.den,
1316
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1317
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1318
                      1 << 30);
1319
214
            avctx->ticks_per_frame = 2;
1320
1321
214
            switch (s->chroma_format) {
1322
158
            case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1323
56
            case 2:
1324
56
            case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1325
            default: av_assert0(0);
1326
            }
1327
        } // MPEG-2
1328
1329
239
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1330
239
        setup_hwaccel_for_pixfmt(avctx);
1331
1332
        /* Quantization matrices may need reordering
1333
         * if DCT permutation is changed. */
1334
239
        memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1335
1336
239
        ff_mpv_idct_init(s);
1337
239
        if ((ret = ff_mpv_common_init(s)) < 0)
1338
            return ret;
1339
1340
239
        quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1341
239
        quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1342
239
        quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1343
239
        quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1344
1345
239
        s1->mpeg_enc_ctx_allocated = 1;
1346
    }
1347
4454
    return 0;
1348
}
1349
1350
4454
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1351
                                int buf_size)
1352
{
1353
4454
    Mpeg1Context *s1  = avctx->priv_data;
1354
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1355
    int ref, f_code, vbv_delay;
1356
1357
4454
    init_get_bits(&s->gb, buf, buf_size * 8);
1358
1359
4454
    ref = get_bits(&s->gb, 10); /* temporal ref */
1360
4454
    s->pict_type = get_bits(&s->gb, 3);
1361

4454
    if (s->pict_type == 0 || s->pict_type > 3)
1362
        return AVERROR_INVALIDDATA;
1363
1364
4454
    vbv_delay = get_bits(&s->gb, 16);
1365
4454
    s->vbv_delay = vbv_delay;
1366
4454
    if (s->pict_type == AV_PICTURE_TYPE_P ||
1367
2103
        s->pict_type == AV_PICTURE_TYPE_B) {
1368
3791
        s->full_pel[0] = get_bits1(&s->gb);
1369
3791
        f_code = get_bits(&s->gb, 3);
1370

3791
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1371
            return AVERROR_INVALIDDATA;
1372
3791
        f_code += !f_code;
1373
3791
        s->mpeg_f_code[0][0] = f_code;
1374
3791
        s->mpeg_f_code[0][1] = f_code;
1375
    }
1376
4454
    if (s->pict_type == AV_PICTURE_TYPE_B) {
1377
1440
        s->full_pel[1] = get_bits1(&s->gb);
1378
1440
        f_code = get_bits(&s->gb, 3);
1379

1440
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1380
            return AVERROR_INVALIDDATA;
1381
1440
        f_code += !f_code;
1382
1440
        s->mpeg_f_code[1][0] = f_code;
1383
1440
        s->mpeg_f_code[1][1] = f_code;
1384
    }
1385
4454
    s->current_picture.f->pict_type = s->pict_type;
1386
4454
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1387
1388
4454
    if (avctx->debug & FF_DEBUG_PICT_INFO)
1389
        av_log(avctx, AV_LOG_DEBUG,
1390
               "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1391
1392
4454
    s->y_dc_scale = 8;
1393
4454
    s->c_dc_scale = 8;
1394
4454
    return 0;
1395
}
1396
1397
649
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1398
{
1399
649
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1400
    int horiz_size_ext, vert_size_ext;
1401
    int bit_rate_ext;
1402
    AVCPBProperties *cpb_props;
1403
1404
649
    skip_bits(&s->gb, 1); /* profile and level esc*/
1405
649
    s->avctx->profile       = get_bits(&s->gb, 3);
1406
649
    s->avctx->level         = get_bits(&s->gb, 4);
1407
649
    s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1408
649
    s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1409
1410
649
    if (!s->chroma_format) {
1411
        s->chroma_format = 1;
1412
        av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1413
    }
1414
1415
649
    horiz_size_ext          = get_bits(&s->gb, 2);
1416
649
    vert_size_ext           = get_bits(&s->gb, 2);
1417
649
    s->width  |= (horiz_size_ext << 12);
1418
649
    s->height |= (vert_size_ext  << 12);
1419
649
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1420
649
    s->bit_rate += (bit_rate_ext << 18) * 400LL;
1421
649
    check_marker(s->avctx, &s->gb, "after bit rate extension");
1422
649
    s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1423
1424
649
    s->low_delay = get_bits1(&s->gb);
1425
649
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1426
        s->low_delay = 1;
1427
1428
649
    s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1429
649
    s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1430
1431
    ff_dlog(s->avctx, "sequence extension\n");
1432
649
    s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1433
1434
649
    if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1435
649
        cpb_props->buffer_size = s1->rc_buffer_size;
1436
649
        if (s->bit_rate != 0x3FFFF*400)
1437
232
            cpb_props->max_bitrate = s->bit_rate;
1438
    }
1439
1440
649
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1441
        av_log(s->avctx, AV_LOG_DEBUG,
1442
               "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1443
               s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1444
               s1->rc_buffer_size, s->bit_rate);
1445
649
}
1446
1447
61
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1448
{
1449
61
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1450
    int color_description, w, h;
1451
1452
61
    skip_bits(&s->gb, 3); /* video format */
1453
61
    color_description = get_bits1(&s->gb);
1454
61
    if (color_description) {
1455
29
        s->avctx->color_primaries = get_bits(&s->gb, 8);
1456
29
        s->avctx->color_trc       = get_bits(&s->gb, 8);
1457
29
        s->avctx->colorspace      = get_bits(&s->gb, 8);
1458
    }
1459
61
    w = get_bits(&s->gb, 14);
1460
61
    skip_bits(&s->gb, 1); // marker
1461
61
    h = get_bits(&s->gb, 14);
1462
    // remaining 3 bits are zero padding
1463
1464
61
    s1->pan_scan.width  = 16 * w;
1465
61
    s1->pan_scan.height = 16 * h;
1466
1467
61
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1468
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1469
61
}
1470
1471
15
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1472
{
1473
15
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1474
    int i, nofco;
1475
1476
15
    nofco = 1;
1477
15
    if (s->progressive_sequence) {
1478
        if (s->repeat_first_field) {
1479
            nofco++;
1480
            if (s->top_field_first)
1481
                nofco++;
1482
        }
1483
    } else {
1484
15
        if (s->picture_structure == PICT_FRAME) {
1485
5
            nofco++;
1486
5
            if (s->repeat_first_field)
1487
3
                nofco++;
1488
        }
1489
    }
1490
38
    for (i = 0; i < nofco; i++) {
1491
23
        s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1492
23
        skip_bits(&s->gb, 1); // marker
1493
23
        s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1494
23
        skip_bits(&s->gb, 1); // marker
1495
    }
1496
1497
15
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1498
        av_log(s->avctx, AV_LOG_DEBUG,
1499
               "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1500
               s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1501
               s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1502
               s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1503
15
}
1504
1505
147
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1506
                       uint16_t matrix1[64], int intra)
1507
{
1508
    int i;
1509
1510
9555
    for (i = 0; i < 64; i++) {
1511
9408
        int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1512
9408
        int v = get_bits(&s->gb, 8);
1513
9408
        if (v == 0) {
1514
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1515
            return AVERROR_INVALIDDATA;
1516
        }
1517

9408
        if (intra && i == 0 && v != 8) {
1518
            av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1519
            v = 8; // needed by pink.mpg / issue1046
1520
        }
1521
9408
        matrix0[j] = v;
1522
9408
        if (matrix1)
1523
8960
            matrix1[j] = v;
1524
    }
1525
147
    return 0;
1526
}
1527
1528
692
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1529
{
1530
    ff_dlog(s->avctx, "matrix extension\n");
1531
1532
692
    if (get_bits1(&s->gb))
1533
19
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1534
692
    if (get_bits1(&s->gb))
1535
49
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1536
692
    if (get_bits1(&s->gb))
1537
6
        load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1538
692
    if (get_bits1(&s->gb))
1539
1
        load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1540
692
}
1541
1542
3960
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1543
{
1544
3960
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1545
1546
3960
    s->full_pel[0]       = s->full_pel[1] = 0;
1547
3960
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1548
3960
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1549
3960
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1550
3960
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1551

3960
    if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1552
        av_log(s->avctx, AV_LOG_ERROR,
1553
               "Missing picture start code, guessing missing values\n");
1554
        if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1555
            if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1556
                s->pict_type = AV_PICTURE_TYPE_I;
1557
            else
1558
                s->pict_type = AV_PICTURE_TYPE_P;
1559
        } else
1560
            s->pict_type = AV_PICTURE_TYPE_B;
1561
        s->current_picture.f->pict_type = s->pict_type;
1562
        s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1563
    }
1564
3960
    s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1565
3960
    s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1566
3960
    s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1567
3960
    s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1568
1569
3960
    s->intra_dc_precision         = get_bits(&s->gb, 2);
1570
3960
    s->picture_structure          = get_bits(&s->gb, 2);
1571
3960
    s->top_field_first            = get_bits1(&s->gb);
1572
3960
    s->frame_pred_frame_dct       = get_bits1(&s->gb);
1573
3960
    s->concealment_motion_vectors = get_bits1(&s->gb);
1574
3960
    s->q_scale_type               = get_bits1(&s->gb);
1575
3960
    s->intra_vlc_format           = get_bits1(&s->gb);
1576
3960
    s->alternate_scan             = get_bits1(&s->gb);
1577
3960
    s->repeat_first_field         = get_bits1(&s->gb);
1578
3960
    s->chroma_420_type            = get_bits1(&s->gb);
1579
3960
    s->progressive_frame          = get_bits1(&s->gb);
1580
1581
3960
    if (s->alternate_scan) {
1582
945
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1583
945
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1584
    } else {
1585
3015
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1586
3015
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1587
    }
1588
1589
    /* composite display not parsed */
1590
    ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1591
    ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1592
    ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1593
    ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1594
    ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1595
    ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1596
    ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1597
    ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1598
    ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1599
3960
}
1600
1601
4089
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1602
{
1603
4089
    AVCodecContext *avctx = s->avctx;
1604
4089
    Mpeg1Context *s1      = (Mpeg1Context *) s;
1605
    int ret;
1606
1607
4089
    if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1608
4089
        if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1609
            return AVERROR_INVALIDDATA;
1610
    }
1611
1612
    /* start frame decoding */
1613

7576
    if (s->first_field || s->picture_structure == PICT_FRAME) {
1614
        AVFrameSideData *pan_scan;
1615
1616
3487
        if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1617
            return ret;
1618
1619
3487
        ff_mpeg_er_frame_start(s);
1620
1621
        /* first check if we must repeat the frame */
1622
3487
        s->current_picture_ptr->f->repeat_pict = 0;
1623
3487
        if (s->repeat_first_field) {
1624
3
            if (s->progressive_sequence) {
1625
                if (s->top_field_first)
1626
                    s->current_picture_ptr->f->repeat_pict = 4;
1627
                else
1628
                    s->current_picture_ptr->f->repeat_pict = 2;
1629
3
            } else if (s->progressive_frame) {
1630
3
                s->current_picture_ptr->f->repeat_pict = 1;
1631
            }
1632
        }
1633
1634
3487
        pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1635
                                          AV_FRAME_DATA_PANSCAN,
1636
                                          sizeof(s1->pan_scan));
1637
3487
        if (!pan_scan)
1638
            return AVERROR(ENOMEM);
1639
3487
        memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1640
1641
3487
        if (s1->a53_caption) {
1642
472
            AVFrameSideData *sd = av_frame_new_side_data(
1643
472
                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1644
                s1->a53_caption_size);
1645
472
            if (sd)
1646
472
                memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
1647
472
            av_freep(&s1->a53_caption);
1648
        }
1649
1650
3487
        if (s1->has_stereo3d) {
1651
            AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1652
            if (!stereo)
1653
                return AVERROR(ENOMEM);
1654
1655
            *stereo = s1->stereo3d;
1656
            s1->has_stereo3d = 0;
1657
        }
1658
1659
3487
        if (s1->has_afd) {
1660
            AVFrameSideData *sd =
1661
202
                av_frame_new_side_data(s->current_picture_ptr->f,
1662
                                       AV_FRAME_DATA_AFD, 1);
1663
202
            if (!sd)
1664
                return AVERROR(ENOMEM);
1665
1666
202
            *sd->data   = s1->afd;
1667
202
            s1->has_afd = 0;
1668
        }
1669
1670
3487
        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1671
            ff_thread_finish_setup(avctx);
1672
    } else { // second field
1673
        int i;
1674
1675
602
        if (!s->current_picture_ptr) {
1676
            av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1677
            return AVERROR_INVALIDDATA;
1678
        }
1679
1680
602
        if (s->avctx->hwaccel) {
1681
            if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1682
                av_log(avctx, AV_LOG_ERROR,
1683
                       "hardware accelerator failed to decode first field\n");
1684
                return ret;
1685
            }
1686
        }
1687
1688
3010
        for (i = 0; i < 4; i++) {
1689
2408
            s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1690
2408
            if (s->picture_structure == PICT_BOTTOM_FIELD)
1691
4
                s->current_picture.f->data[i] +=
1692
4
                    s->current_picture_ptr->f->linesize[i];
1693
        }
1694
    }
1695
1696
4089
    if (avctx->hwaccel) {
1697
        if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1698
            return ret;
1699
    }
1700
1701
4089
    return 0;
1702
}
1703
1704
#define DECODE_SLICE_ERROR -1
1705
#define DECODE_SLICE_OK     0
1706
1707
/**
1708
 * Decode a slice.
1709
 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1710
 * @return DECODE_SLICE_ERROR if the slice is damaged,
1711
 *         DECODE_SLICE_OK if this slice is OK
1712
 */
1713
111335
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1714
                             const uint8_t **buf, int buf_size)
1715
{
1716
111335
    AVCodecContext *avctx = s->avctx;
1717
111335
    const int lowres      = s->avctx->lowres;
1718
111335
    const int field_pic   = s->picture_structure != PICT_FRAME;
1719
    int ret;
1720
1721
111335
    s->resync_mb_x =
1722
111335
    s->resync_mb_y = -1;
1723
1724
111335
    av_assert0(mb_y < s->mb_height);
1725
1726
111335
    init_get_bits(&s->gb, *buf, buf_size * 8);
1727

111335
    if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1728
        skip_bits(&s->gb, 3);
1729
1730
111335
    ff_mpeg1_clean_buffers(s);
1731
111335
    s->interlaced_dct = 0;
1732
1733
111335
    s->qscale = mpeg_get_qscale(s);
1734
1735
111335
    if (s->qscale == 0) {
1736
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1737
        return AVERROR_INVALIDDATA;
1738
    }
1739
1740
    /* extra slice info */
1741
111335
    if (skip_1stop_8data_bits(&s->gb) < 0)
1742
        return AVERROR_INVALIDDATA;
1743
1744
111335
    s->mb_x = 0;
1745
1746

111335
    if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1747
        skip_bits1(&s->gb);
1748
    } else {
1749
123534
        while (get_bits_left(&s->gb) > 0) {
1750
123534
            int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1751
                                MBINCR_VLC_BITS, 2);
1752
123534
            if (code < 0) {
1753
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1754
                return AVERROR_INVALIDDATA;
1755
            }
1756
123534
            if (code >= 33) {
1757
12199
                if (code == 33)
1758
12199
                    s->mb_x += 33;
1759
                /* otherwise, stuffing, nothing to do */
1760
            } else {
1761
111335
                s->mb_x += code;
1762
111335
                break;
1763
            }
1764
        }
1765
    }
1766
1767
111335
    if (s->mb_x >= (unsigned) s->mb_width) {
1768
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1769
        return AVERROR_INVALIDDATA;
1770
    }
1771
1772

111335
    if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1773
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1774
        int start_code = -1;
1775
        buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1776
        if (buf_end < *buf + buf_size)
1777
            buf_end -= 4;
1778
        s->mb_y = mb_y;
1779
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1780
            return DECODE_SLICE_ERROR;
1781
        *buf = buf_end;
1782
        return DECODE_SLICE_OK;
1783
    }
1784
1785
111335
    s->resync_mb_x = s->mb_x;
1786
111335
    s->resync_mb_y = s->mb_y = mb_y;
1787
111335
    s->mb_skip_run = 0;
1788
111335
    ff_init_block_index(s);
1789
1790


111335
    if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1791
2886
        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1792
            av_log(s->avctx, AV_LOG_DEBUG,
1793
                   "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",
1794
                   s->qscale,
1795
                   s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1796
                   s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1797
                   s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1798
                   (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1799
                   (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1800
                   s->progressive_sequence ? "ps"  : "",
1801
                   s->progressive_frame    ? "pf"  : "",
1802
                   s->alternate_scan       ? "alt" : "",
1803
                   s->top_field_first      ? "top" : "",
1804
                   s->intra_dc_precision, s->picture_structure,
1805
                   s->frame_pred_frame_dct, s->concealment_motion_vectors,
1806
                   s->q_scale_type, s->intra_vlc_format,
1807
                   s->repeat_first_field, s->chroma_420_type ? "420" : "");
1808
        }
1809
    }
1810
1811
    for (;;) {
1812
        // If 1, we memcpy blocks in xvmcvideo.
1813
1948043
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1814
            ff_xvmc_init_block(s); // set s->block
1815
1816
2059378
        if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1817
4
            return ret;
1818
1819
        // Note motion_val is normally NULL unless we want to extract the MVs.
1820

2059374
        if (s->current_picture.motion_val[0] && !s->encoding) {
1821
            const int wrap = s->b8_stride;
1822
            int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1823
            int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1824
            int motion_x, motion_y, dir, i;
1825
1826
            for (i = 0; i < 2; i++) {
1827
                for (dir = 0; dir < 2; dir++) {
1828
                    if (s->mb_intra ||
1829
                        (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1830
                        motion_x = motion_y = 0;
1831
                    } else if (s->mv_type == MV_TYPE_16X16 ||
1832
                               (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1833
                        motion_x = s->mv[dir][0][0];
1834
                        motion_y = s->mv[dir][0][1];
1835
                    } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1836
                        motion_x = s->mv[dir][i][0];
1837
                        motion_y = s->mv[dir][i][1];
1838
                    }
1839
1840
                    s->current_picture.motion_val[dir][xy][0]     = motion_x;
1841
                    s->current_picture.motion_val[dir][xy][1]     = motion_y;
1842
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1843
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1844
                    s->current_picture.ref_index [dir][b8_xy]     =
1845
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1846
                    av_assert2(s->field_select[dir][i] == 0 ||
1847
                               s->field_select[dir][i] == 1);
1848
                }
1849
                xy    += wrap;
1850
                b8_xy += 2;
1851
            }
1852
        }
1853
1854
2059374
        s->dest[0] += 16 >> lowres;
1855
2059374
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1856
2059374
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1857
1858
2059374
        ff_mpv_reconstruct_mb(s, s->block);
1859
1860
2059374
        if (++s->mb_x >= s->mb_width) {
1861
66414
            const int mb_size = 16 >> s->avctx->lowres;
1862
            int left;
1863
1864
66414
            ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1865
66414
            ff_mpv_report_decode_progress(s);
1866
1867
66414
            s->mb_x  = 0;
1868
66414
            s->mb_y += 1 << field_pic;
1869
1870
66414
            if (s->mb_y >= s->mb_height) {
1871
4085
                int left   = get_bits_left(&s->gb);
1872
8431
                int is_d10 = s->chroma_format == 2 &&
1873
261
                             s->pict_type == AV_PICTURE_TYPE_I &&
1874

49
                             avctx->profile == 0 && avctx->level == 5 &&
1875
49
                             s->intra_dc_precision == 2 &&
1876

4371
                             s->q_scale_type == 1 && s->alternate_scan == 0 &&
1877
25
                             s->progressive_frame == 0
1878
                             /* vbv_delay == 0xBBB || 0xE10 */;
1879
1880

4085
                if (left >= 32 && !is_d10) {
1881
1002
                    GetBitContext gb = s->gb;
1882
1002
                    align_get_bits(&gb);
1883
1002
                    if (show_bits(&gb, 24) == 0x060E2B) {
1884
                        av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1885
                        is_d10 = 1;
1886
                    }
1887

1002
                    if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1888
                        av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1889
                        goto eos;
1890
                    }
1891
                }
1892
1893

4085
                if (left < 0 ||
1894

3788
                    (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1895

4085
                    ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1896
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1897
                           left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1898
                    return AVERROR_INVALIDDATA;
1899
                } else
1900
4085
                    goto eos;
1901
            }
1902
            // There are some files out there which are missing the last slice
1903
            // in cases where the slice is completely outside the visible
1904
            // area, we detect this here instead of running into the end expecting
1905
            // more data
1906
62329
            left = get_bits_left(&s->gb);
1907
62329
            if (s->mb_y >= ((s->height + 15) >> 4) &&
1908

200
                !s->progressive_sequence &&
1909
                left <= 25 &&
1910
                left >= 0 &&
1911
                s->mb_skip_run == -1 &&
1912
                (!left || show_bits(&s->gb, left) == 0))
1913
                goto eos;
1914
1915
62329
            ff_init_block_index(s);
1916
        }
1917
1918
        /* skip mb handling */
1919
2055289
        if (s->mb_skip_run == -1) {
1920
            /* read increment again */
1921
1900580
            s->mb_skip_run = 0;
1922
1229
            for (;;) {
1923
1901809
                int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1924
                                    MBINCR_VLC_BITS, 2);
1925
1901809
                if (code < 0) {
1926
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1927
                    return AVERROR_INVALIDDATA;
1928
                }
1929
1901809
                if (code >= 33) {
1930
108475
                    if (code == 33) {
1931
1229
                        s->mb_skip_run += 33;
1932
107246
                    } else if (code == 35) {
1933

107246
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1934
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1935
                            return AVERROR_INVALIDDATA;
1936
                        }
1937
107246
                        goto eos; /* end of slice */
1938
                    }
1939
                    /* otherwise, stuffing, nothing to do */
1940
                } else {
1941
1793334
                    s->mb_skip_run += code;
1942
1793334
                    break;
1943
                }
1944
            }
1945
1793334
            if (s->mb_skip_run) {
1946
                int i;
1947
57259
                if (s->pict_type == AV_PICTURE_TYPE_I) {
1948
                    av_log(s->avctx, AV_LOG_ERROR,
1949
                           "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1950
                    return AVERROR_INVALIDDATA;
1951
                }
1952
1953
                /* skip mb */
1954
57259
                s->mb_intra = 0;
1955
744367
                for (i = 0; i < 12; i++)
1956
687108
                    s->block_last_index[i] = -1;
1957
57259
                if (s->picture_structure == PICT_FRAME)
1958
39187
                    s->mv_type = MV_TYPE_16X16;
1959
                else
1960
18072
                    s->mv_type = MV_TYPE_FIELD;
1961
57259
                if (s->pict_type == AV_PICTURE_TYPE_P) {
1962
                    /* if P type, zero motion vector is implied */
1963
20815
                    s->mv_dir             = MV_DIR_FORWARD;
1964
20815
                    s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1965
20815
                    s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1966
20815
                    s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1967
20815
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1968
                } else {
1969
                    /* if B type, reuse previous vectors and directions */
1970
36444
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1971
36444
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1972
36444
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1973
36444
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1974
36444
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1975
36444
                    s->field_select[1][0] = (s->picture_structure - 1) & 1;
1976
                }
1977
            }
1978
        }
1979
    }
1980
111331
eos: // end of slice
1981
111331
    if (get_bits_left(&s->gb) < 0) {
1982
        av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1983
        return AVERROR_INVALIDDATA;
1984
    }
1985
111331
    *buf += (get_bits_count(&s->gb) - 1) / 8;
1986
    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);
1987
111331
    return 0;
1988
}
1989
1990
4248
static int slice_decode_thread(AVCodecContext *c, void *arg)
1991
{
1992
4248
    MpegEncContext *s   = *(void **) arg;
1993
4248
    const uint8_t *buf  = s->gb.buffer;
1994
4248
    int mb_y            = s->start_mb_y;
1995
4248
    const int field_pic = s->picture_structure != PICT_FRAME;
1996
1997
4248
    s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1998
1999
9912
    for (;;) {
2000
        uint32_t start_code;
2001
        int ret;
2002
2003
14160
        ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2004
14160
        emms_c();
2005
        ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2006
                ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2007
                s->start_mb_y, s->end_mb_y, s->er.error_count);
2008
14160
        if (ret < 0) {
2009
            if (c->err_recognition & AV_EF_EXPLODE)
2010
4248
                return ret;
2011
            if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2012
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2013
                                s->mb_x, s->mb_y,
2014
                                ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2015
        } else {
2016
14160
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2017
14160
                            s->mb_x - 1, s->mb_y,
2018
                            ER_AC_END | ER_DC_END | ER_MV_END);
2019
        }
2020
2021
14160
        if (s->mb_y == s->end_mb_y)
2022
4248
            return 0;
2023
2024
9912
        start_code = -1;
2025
9912
        buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2026

9912
        if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2027
            return AVERROR_INVALIDDATA;
2028
9912
        mb_y       = start_code - SLICE_MIN_START_CODE;
2029

9912
        if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2030
            mb_y += (*buf&0xE0)<<2;
2031
9912
        mb_y <<= field_pic;
2032
9912
        if (s->picture_structure == PICT_BOTTOM_FIELD)
2033
            mb_y++;
2034
9912
        if (mb_y >= s->end_mb_y)
2035
            return AVERROR_INVALIDDATA;
2036
    }
2037
}
2038
2039
/**
2040
 * Handle slice ends.
2041
 * @return 1 if it seems to be the last slice
2042
 */
2043
3747
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2044
{
2045
3747
    Mpeg1Context *s1  = avctx->priv_data;
2046
3747
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2047
2048

3747
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2049
259
        return 0;
2050
2051
3488
    if (s->avctx->hwaccel) {
2052
        int ret = s->avctx->hwaccel->end_frame(s->avctx);
2053
        if (ret < 0) {
2054
            av_log(avctx, AV_LOG_ERROR,
2055
                   "hardware accelerator failed to decode picture\n");
2056
            return ret;
2057
        }
2058
    }
2059
2060
    /* end of slice reached */
2061

3488
    if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2062
        /* end of image */
2063
2064
3487
        ff_er_frame_end(&s->er);
2065
2066
3487
        ff_mpv_frame_end(s);
2067
2068

5160
        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2069
1673
            int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2070
1673
            if (ret < 0)
2071
                return ret;
2072
1673
            ff_print_debug_info(s, s->current_picture_ptr, pict);
2073
1673
            ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2074
        } else {
2075
1814
            if (avctx->active_thread_type & FF_THREAD_FRAME)
2076
                s->picture_number++;
2077
            /* latency of 1 frame for I- and P-frames */
2078
            /* XXX: use another variable than picture_number */
2079
1814
            if (s->last_picture_ptr) {
2080
1755
                int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2081
1755
                if (ret < 0)
2082
                    return ret;
2083
1755
                ff_print_debug_info(s, s->last_picture_ptr, pict);
2084
1755
                ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2085
            }
2086
        }
2087
2088
3487
        return 1;
2089
    } else {
2090
1
        return 0;
2091
    }
2092
}
2093
2094
741
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2095
                                 const uint8_t *buf, int buf_size)
2096
{
2097
741
    Mpeg1Context *s1  = avctx->priv_data;
2098
741
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2099
    int width, height;
2100
    int i, v, j;
2101
2102
741
    init_get_bits(&s->gb, buf, buf_size * 8);
2103
2104
741
    width  = get_bits(&s->gb, 12);
2105
741
    height = get_bits(&s->gb, 12);
2106

741
    if (width == 0 || height == 0) {
2107
        av_log(avctx, AV_LOG_WARNING,
2108
               "Invalid horizontal or vertical size value.\n");
2109
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2110
            return AVERROR_INVALIDDATA;
2111
    }
2112
741
    s->aspect_ratio_info = get_bits(&s->gb, 4);
2113
741
    if (s->aspect_ratio_info == 0) {
2114
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2115
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2116
            return AVERROR_INVALIDDATA;
2117
    }
2118
741
    s->frame_rate_index = get_bits(&s->gb, 4);
2119

741
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2120
        av_log(avctx, AV_LOG_WARNING,
2121
               "frame_rate_index %d is invalid\n", s->frame_rate_index);
2122
        s->frame_rate_index = 1;
2123
    }
2124
741
    s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2125
741
    if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2126
        return AVERROR_INVALIDDATA;
2127
    }
2128
2129
741
    s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2130
741
    skip_bits(&s->gb, 1);
2131
2132
    /* get matrix */
2133
741
    if (get_bits1(&s->gb)) {
2134
18
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2135
    } else {
2136
46995
        for (i = 0; i < 64; i++) {
2137
46272
            j = s->idsp.idct_permutation[i];
2138
46272
            v = ff_mpeg1_default_intra_matrix[i];
2139
46272
            s->intra_matrix[j]        = v;
2140
46272
            s->chroma_intra_matrix[j] = v;
2141
        }
2142
    }
2143
741
    if (get_bits1(&s->gb)) {
2144
54
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2145
    } else {
2146
44655
        for (i = 0; i < 64; i++) {
2147
43968
            int j = s->idsp.idct_permutation[i];
2148
43968
            v = ff_mpeg1_default_non_intra_matrix[i];
2149
43968
            s->inter_matrix[j]        = v;
2150
43968
            s->chroma_inter_matrix[j] = v;
2151
        }
2152
    }
2153
2154
741
    if (show_bits(&s->gb, 23) != 0) {
2155
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2156
        return AVERROR_INVALIDDATA;
2157
    }
2158
2159
741
    s->width  = width;
2160
741
    s->height = height;
2161
2162
    /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2163
741
    s->progressive_sequence = 1;
2164
741
    s->progressive_frame    = 1;
2165
741
    s->picture_structure    = PICT_FRAME;
2166
741
    s->first_field          = 0;
2167
741
    s->frame_pred_frame_dct = 1;
2168
741
    s->chroma_format        = 1;
2169
741
    s->codec_id             =
2170
741
    s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2171
741
    s->out_format           = FMT_MPEG1;
2172
741
    s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2173
741
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2174
        s->low_delay = 1;
2175
2176
741
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2177
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2178
               s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2179
2180
741
    return 0;
2181
}
2182
2183
2
static int vcr2_init_sequence(AVCodecContext *avctx)
2184
{
2185
2
    Mpeg1Context *s1  = avctx->priv_data;
2186
2
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2187
    int i, v, ret;
2188
2189
    /* start new MPEG-1 context decoding */
2190
2
    s->out_format = FMT_MPEG1;
2191
2
    if (s1->mpeg_enc_ctx_allocated) {
2192
        ff_mpv_common_end(s);
2193
        s1->mpeg_enc_ctx_allocated = 0;
2194
    }
2195
2
    s->width            = avctx->coded_width;
2196
2
    s->height           = avctx->coded_height;
2197
2
    avctx->has_b_frames = 0; // true?
2198
2
    s->low_delay        = 1;
2199
2200
2
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2201
2
    setup_hwaccel_for_pixfmt(avctx);
2202
2203
2
    ff_mpv_idct_init(s);
2204
2
    if ((ret = ff_mpv_common_init(s)) < 0)
2205
        return ret;
2206
2
    s1->mpeg_enc_ctx_allocated = 1;
2207
2208
130
    for (i = 0; i < 64; i++) {
2209
128
        int j = s->idsp.idct_permutation[i];
2210
128
        v = ff_mpeg1_default_intra_matrix[i];
2211
128
        s->intra_matrix[j]        = v;
2212
128
        s->chroma_intra_matrix[j] = v;
2213
2214
128
        v = ff_mpeg1_default_non_intra_matrix[i];
2215
128
        s->inter_matrix[j]        = v;
2216
128
        s->chroma_inter_matrix[j] = v;
2217
    }
2218
2219
2
    s->progressive_sequence  = 1;
2220
2
    s->progressive_frame     = 1;
2221
2
    s->picture_structure     = PICT_FRAME;
2222
2
    s->first_field           = 0;
2223
2
    s->frame_pred_frame_dct  = 1;
2224
2
    s->chroma_format         = 1;
2225
2
    if (s->codec_tag == AV_RL32("BW10")) {
2226
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2227
    } else {
2228
2
        s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2229
2
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2230
    }
2231
2
    s1->save_width           = s->width;
2232
2
    s1->save_height          = s->height;
2233
2
    s1->save_progressive_seq = s->progressive_sequence;
2234
2
    return 0;
2235
}
2236
2237
525
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2238
                              const uint8_t *p, int buf_size)
2239
{
2240
525
    Mpeg1Context *s1 = avctx->priv_data;
2241
2242
525
    if (buf_size >= 6 &&
2243


525
        p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2244

277
        p[4] == 3 && (p[5] & 0x40)) {
2245
        /* extract A53 Part 4 CC data */
2246
277
        int cc_count = p[5] & 0x1f;
2247

277
        if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2248
277
            av_freep(&s1->a53_caption);
2249
277
            s1->a53_caption_size = cc_count * 3;
2250
277
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
2251
277
            if (!s1->a53_caption) {
2252
                s1->a53_caption_size = 0;
2253
            } else {
2254
277
                memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
2255
            }
2256
277
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2257
        }
2258
277
        return 1;
2259
248
    } else if (buf_size >= 2 &&
2260

248
               p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2261
        /* extract SCTE-20 CC data */
2262
        GetBitContext gb;
2263
205
        int cc_count = 0;
2264
        int i;
2265
2266
205
        init_get_bits(&gb, p + 2, buf_size - 2);
2267
205
        cc_count = get_bits(&gb, 5);
2268
205
        if (cc_count > 0) {
2269
205
            av_freep(&s1->a53_caption);
2270
205
            s1->a53_caption_size = cc_count * 3;
2271
205
            s1->a53_caption      = av_mallocz(s1->a53_caption_size);
2272
205
            if (!s1->a53_caption) {
2273
                s1->a53_caption_size = 0;
2274
            } else {
2275
                uint8_t field, cc1, cc2;
2276
205
                uint8_t *cap = s1->a53_caption;
2277

615
                for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2278
410
                    skip_bits(&gb, 2); // priority
2279
410
                    field = get_bits(&gb, 2);
2280
410
                    skip_bits(&gb, 5); // line_offset
2281
410
                    cc1 = get_bits(&gb, 8);
2282
410
                    cc2 = get_bits(&gb, 8);
2283
410
                    skip_bits(&gb, 1); // marker
2284
2285
410
                    if (!field) { // forbidden
2286
                        cap[0] = cap[1] = cap[2] = 0x00;
2287
                    } else {
2288
410
                        field = (field == 2 ? 1 : 0);
2289
410
                        if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2290
410
                        cap[0] = 0x04 | field;
2291
410
                        cap[1] = ff_reverse[cc1];
2292
410
                        cap[2] = ff_reverse[cc2];
2293
                    }
2294
410
                    cap += 3;
2295
                }
2296
            }
2297
205
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2298
        }
2299
205
        return 1;
2300
43
    } else if (buf_size >= 11 &&
2301


43
               p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2302
        /* extract DVD CC data
2303
         *
2304
         * uint32_t   user_data_start_code        0x000001B2    (big endian)
2305
         * uint16_t   user_identifier             0x4343 "CC"
2306
         * uint8_t    user_data_type_code         0x01
2307
         * uint8_t    caption_block_size          0xF8
2308
         * uint8_t
2309
         *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2310
         *   bit 6    caption_filler              0
2311
         *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2312
         *   bit 0    caption_extra_field_added   1=one additional caption word
2313
         *
2314
         * struct caption_field_block {
2315
         *   uint8_t
2316
         *     bit 7:1 caption_filler             0x7F (all 1s)
2317
         *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2318
         *   uint8_t   caption_first_byte
2319
         *   uint8_t   caption_second_byte
2320
         * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2321
         *
2322
         * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2323
         * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2324
         * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2325
         * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2326
         * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2327
        int cc_count = 0;
2328
        int i;
2329
        // There is a caption count field in the data, but it is often
2330
        // incorrect.  So count the number of captions present.
2331
        for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2332
            cc_count++;
2333
        // Transform the DVD format into A53 Part 4 format
2334
        if (cc_count > 0) {
2335
            av_freep(&s1->a53_caption);
2336
            s1->a53_caption_size = cc_count * 6;
2337
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
2338
            if (!s1->a53_caption) {
2339
                s1->a53_caption_size = 0;
2340
            } else {
2341
                uint8_t field1 = !!(p[4] & 0x80);
2342
                uint8_t *cap = s1->a53_caption;
2343
                p += 5;
2344
                for (i = 0; i < cc_count; i++) {
2345
                    cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2346
                    cap[1] = p[1];
2347
                    cap[2] = p[2];
2348
                    cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2349
                    cap[4] = p[4];
2350
                    cap[5] = p[5];
2351
                    cap += 6;
2352
                    p += 6;
2353
                }
2354
            }
2355
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2356
        }
2357
        return 1;
2358
    }
2359
43
    return 0;
2360
}
2361
2362
732
static void mpeg_decode_user_data(AVCodecContext *avctx,
2363
                                  const uint8_t *p, int buf_size)
2364
{
2365
732
    Mpeg1Context *s = avctx->priv_data;
2366
732
    const uint8_t *buf_end = p + buf_size;
2367
732
    Mpeg1Context *s1 = avctx->priv_data;
2368
2369
#if 0
2370
    int i;
2371
    for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2372
        av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2373
    }
2374
    av_log(avctx, AV_LOG_ERROR, "\n");
2375
#endif
2376
2377
732
    if (buf_size > 29){
2378
        int i;
2379
15372
        for(i=0; i<20; i++)
2380
14640
            if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2381
                s->tmpgexs= 1;
2382
            }
2383
    }
2384
    /* we parse the DTG active format information */
2385
732
    if (buf_end - p >= 5 &&
2386


939
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2387
207
        int flags = p[4];
2388
207
        p += 5;
2389
207
        if (flags & 0x80) {
2390
            /* skip event id */
2391
            p += 2;
2392
        }
2393
207
        if (flags & 0x40) {
2394
207
            if (buf_end - p < 1)
2395
                return;
2396
207
            s1->has_afd = 1;
2397
207
            s1->afd     = p[0] & 0x0f;
2398
        }
2399
525
    } else if (buf_end - p >= 6 &&
2400


525
               p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2401
               p[4] == 0x03) { // S3D_video_format_length
2402
        // the 0x7F mask ignores the reserved_bit value
2403
        const uint8_t S3D_video_format_type = p[5] & 0x7F;
2404
2405
        if (S3D_video_format_type == 0x03 ||
2406
            S3D_video_format_type == 0x04 ||
2407
            S3D_video_format_type == 0x08 ||
2408
            S3D_video_format_type == 0x23) {
2409
2410
            s1->has_stereo3d = 1;
2411
2412
            switch (S3D_video_format_type) {
2413
            case 0x03:
2414
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2415
                break;
2416
            case 0x04:
2417
                s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2418
                break;
2419
            case 0x08:
2420
                s1->stereo3d.type = AV_STEREO3D_2D;
2421
                break;
2422
            case 0x23:
2423
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2424
                break;
2425
            }
2426
        }
2427
525
    } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2428
482
        return;
2429
    }
2430
}
2431
2432
513
static void mpeg_decode_gop(AVCodecContext *avctx,
2433
                            const uint8_t *buf, int buf_size)
2434
{
2435
513
    Mpeg1Context *s1  = avctx->priv_data;
2436
513
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2437
    int broken_link;
2438
    int64_t tc;
2439
2440
513
    init_get_bits(&s->gb, buf, buf_size * 8);
2441
2442
513
    tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2443
2444
#if FF_API_PRIVATE_OPT
2445
FF_DISABLE_DEPRECATION_WARNINGS
2446
513
    avctx->timecode_frame_start = tc;
2447
FF_ENABLE_DEPRECATION_WARNINGS
2448
#endif
2449
2450
513
    s->closed_gop = get_bits1(&s->gb);
2451
    /* broken_link indicates that after editing the
2452
     * reference frames of the first B-Frames after GOP I-Frame
2453
     * are missing (open gop) */
2454
513
    broken_link = get_bits1(&s->gb);
2455
2456
513
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2457
        char tcbuf[AV_TIMECODE_STR_SIZE];
2458
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
2459
        av_log(s->avctx, AV_LOG_DEBUG,
2460
               "GOP (%s) closed_gop=%d broken_link=%d\n",
2461
               tcbuf, s->closed_gop, broken_link);
2462
    }
2463
513
}
2464
2465
4141
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2466
                         int *got_output, const uint8_t *buf, int buf_size)
2467
{
2468
4141
    Mpeg1Context *s = avctx->priv_data;
2469
4141
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2470
4141
    const uint8_t *buf_ptr = buf;
2471
4141
    const uint8_t *buf_end = buf + buf_size;
2472
    int ret, input_size;
2473
4141
    int last_code = 0, skip_frame = 0;
2474
4141
    int picture_start_code_seen = 0;
2475
2476
199014
    for (;;) {
2477
        /* find next start code */
2478
203155
        uint32_t start_code = -1;
2479
203155
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2480
203155
        if (start_code > 0x1ff) {
2481
4019
            if (!skip_frame) {
2482
3747
                if (HAVE_THREADS &&
2483
3747
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2484
475
                    !avctx->hwaccel) {
2485
                    int i;
2486
475
                    av_assert0(avctx->thread_count > 1);
2487
2488
475
                    avctx->execute(avctx, slice_decode_thread,
2489
475
                                   &s2->thread_context[0], NULL,
2490
                                   s->slice_count, sizeof(void *));
2491
4723
                    for (i = 0; i < s->slice_count; i++)
2492
4248
                        s2->er.error_count += s2->thread_context[i]->er.error_count;
2493
                }
2494
2495
3747
                ret = slice_end(avctx, picture);
2496
3747
                if (ret < 0)
2497
4141
                    return ret;
2498
3747
                else if (ret) {
2499
                    // FIXME: merge with the stuff in mpeg_decode_slice
2500

3487
                    if (s2->last_picture_ptr || s2->low_delay)
2501
3428
                        *got_output = 1;
2502
                }
2503
            }
2504
4019
            s2->pict_type = 0;
2505
2506

4019
            if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2507
                return AVERROR_INVALIDDATA;
2508
2509
4019
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2510
        }
2511
2512
199136
        input_size = buf_end - buf_ptr;
2513
2514
199136
        if (avctx->debug & FF_DEBUG_STARTCODE)
2515
            av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2516
                   start_code, buf_ptr - buf, input_size);
2517
2518
        /* prepare data for next start code */
2519

199136
        switch (start_code) {
2520
741
        case SEQ_START_CODE:
2521
741
            if (last_code == 0) {
2522
741
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2523
741
                if (buf != avctx->extradata)
2524
504
                    s->sync = 1;
2525
            } else {
2526
                av_log(avctx, AV_LOG_ERROR,
2527
                       "ignoring SEQ_START_CODE after %X\n", last_code);
2528
                if (avctx->err_recognition & AV_EF_EXPLODE)
2529
                    return AVERROR_INVALIDDATA;
2530
            }
2531
741
            break;
2532
2533
4576
        case PICTURE_START_CODE:
2534

4576
            if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2535
               /* If it's a frame picture, there can't be more than one picture header.
2536
                  Yet, it does happen and we need to handle it. */
2537
               av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2538
               break;
2539
            }
2540
4576
            picture_start_code_seen = 1;
2541
2542

4576
            if (s2->width <= 0 || s2->height <= 0) {
2543
122
                av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2544
                       s2->width, s2->height);
2545
122
                return AVERROR_INVALIDDATA;
2546
            }
2547
2548
4454
            if (s->tmpgexs){
2549
                s2->intra_dc_precision= 3;
2550
                s2->intra_matrix[0]= 1;
2551
            }
2552
4454
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2553

478
                !avctx->hwaccel && s->slice_count) {
2554
                int i;
2555
2556
                avctx->execute(avctx, slice_decode_thread,
2557
                               s2->thread_context, NULL,
2558
                               s->slice_count, sizeof(void *));
2559
                for (i = 0; i < s->slice_count; i++)
2560
                    s2->er.error_count += s2->thread_context[i]->er.error_count;
2561
                s->slice_count = 0;
2562
            }
2563

4454
            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2564
4454
                ret = mpeg_decode_postinit(avctx);
2565
4454
                if (ret < 0) {
2566
                    av_log(avctx, AV_LOG_ERROR,
2567
                           "mpeg_decode_postinit() failure\n");
2568
                    return ret;
2569
                }
2570
2571
                /* We have a complete image: we try to decompress it. */
2572
4454
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2573
                    s2->pict_type = 0;
2574
4454
                s->first_slice = 1;
2575
4454
                last_code      = PICTURE_START_CODE;
2576
            } else {
2577
                av_log(avctx, AV_LOG_ERROR,
2578
                       "ignoring pic after %X\n", last_code);
2579
                if (avctx->err_recognition & AV_EF_EXPLODE)
2580
                    return AVERROR_INVALIDDATA;
2581
            }
2582
4454
            break;
2583
5377
        case EXT_START_CODE:
2584
5377
            init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2585
2586
5377
            switch (get_bits(&s2->gb, 4)) {
2587
649
            case 0x1:
2588
649
                if (last_code == 0) {
2589
649
                    mpeg_decode_sequence_extension(s);
2590
                } else {
2591
                    av_log(avctx, AV_LOG_ERROR,
2592
                           "ignoring seq ext after %X\n", last_code);
2593
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2594
                        return AVERROR_INVALIDDATA;
2595
                }
2596
649
                break;
2597
61
            case 0x2:
2598
61
                mpeg_decode_sequence_display_extension(s);
2599
61
                break;
2600
692
            case 0x3:
2601
692
                mpeg_decode_quant_matrix_extension(s2);
2602
692
                break;
2603
15
            case 0x7:
2604
15
                mpeg_decode_picture_display_extension(s);
2605
15
                break;
2606
3960
            case 0x8:
2607
3960
                if (last_code == PICTURE_START_CODE) {
2608
3960
                    mpeg_decode_picture_coding_extension(s);
2609
                } else {
2610
                    av_log(avctx, AV_LOG_ERROR,
2611
                           "ignoring pic cod ext after %X\n", last_code);
2612
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2613
                        return AVERROR_INVALIDDATA;
2614
                }
2615
3960
                break;
2616
            }
2617
5377
            break;
2618
732
        case USER_START_CODE:
2619
732
            mpeg_decode_user_data(avctx, buf_ptr, input_size);
2620
732
            break;
2621
513
        case GOP_START_CODE:
2622
513
            if (last_code == 0) {
2623
513
                s2->first_field = 0;
2624
513
                mpeg_decode_gop(avctx, buf_ptr, input_size);
2625
513
                s->sync = 1;
2626
            } else {
2627
                av_log(avctx, AV_LOG_ERROR,
2628
                       "ignoring GOP_START_CODE after %X\n", last_code);
2629
                if (avctx->err_recognition & AV_EF_EXPLODE)
2630
                    return AVERROR_INVALIDDATA;
2631
            }
2632
513
            break;
2633
187197
        default:
2634
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2635

186651
                start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2636

4454
                if (s2->progressive_sequence && !s2->progressive_frame) {
2637
                    s2->progressive_frame = 1;
2638
                    av_log(s2->avctx, AV_LOG_ERROR,
2639
                           "interlaced frame in progressive sequence, ignoring\n");
2640
                }
2641
2642
4454
                if (s2->picture_structure == 0 ||
2643

4454
                    (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2644
                    av_log(s2->avctx, AV_LOG_ERROR,
2645
                           "picture_structure %d invalid, ignoring\n",
2646
                           s2->picture_structure);
2647
                    s2->picture_structure = PICT_FRAME;
2648
                }
2649
2650

4454
                if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2651
                    av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2652
2653
4454
                if (s2->picture_structure == PICT_FRAME) {
2654
3064
                    s2->first_field = 0;
2655
3064
                    s2->v_edge_pos  = 16 * s2->mb_height;
2656
                } else {
2657
1390
                    s2->first_field ^= 1;
2658
1390
                    s2->v_edge_pos   = 8 * s2->mb_height;
2659
1390
                    memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2660
                }
2661
            }
2662
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2663

186651
                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2664
186507
                const int field_pic = s2->picture_structure != PICT_FRAME;
2665
186507
                int mb_y = start_code - SLICE_MIN_START_CODE;
2666
186507
                last_code = SLICE_MIN_START_CODE;
2667

186507
                if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2668
                    mb_y += (*buf_ptr&0xE0)<<2;
2669
2670
186507
                mb_y <<= field_pic;
2671
186507
                if (s2->picture_structure == PICT_BOTTOM_FIELD)
2672
10341
                    mb_y++;
2673
2674
186507
                if (buf_end - buf_ptr < 2) {
2675
                    av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2676
                    return AVERROR_INVALIDDATA;
2677
                }
2678
2679
186507
                if (mb_y >= s2->mb_height) {
2680
                    av_log(s2->avctx, AV_LOG_ERROR,
2681
                           "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2682
                    return AVERROR_INVALIDDATA;
2683
                }
2684
2685
186507
                if (!s2->last_picture_ptr) {
2686
                    /* Skip B-frames if we do not have reference frames and
2687
                     * GOP is not closed. */
2688
78806
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2689
612
                        if (!s2->closed_gop) {
2690
612
                            skip_frame = 1;
2691
612
                            av_log(s2->avctx, AV_LOG_DEBUG,
2692
                                   "Skipping B slice due to open GOP\n");
2693
612
                            break;
2694
                        }
2695
                    }
2696
                }
2697

185895
                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2698
120936
                    s->sync = 1;
2699
185895
                if (!s2->next_picture_ptr) {
2700
                    /* Skip P-frames if we do not have a reference frame or
2701
                     * we have an invalid header. */
2702

74630
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2703
3060
                        skip_frame = 1;
2704
3060
                        av_log(s2->avctx, AV_LOG_DEBUG,
2705
                               "Skipping P slice due to !sync\n");
2706
3060
                        break;
2707
                    }
2708
                }
2709
182835
                if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2710
71500
                     s2->pict_type == AV_PICTURE_TYPE_B) ||
2711
182835
                    (avctx->skip_frame >= AVDISCARD_NONKEY &&
2712
71500
                     s2->pict_type != AV_PICTURE_TYPE_I) ||
2713
182218
                    avctx->skip_frame >= AVDISCARD_ALL) {
2714
71500
                    skip_frame = 1;
2715
71500
                    break;
2716
                }
2717
2718
111335
                if (!s->mpeg_enc_ctx_allocated)
2719
                    break;
2720
2721
111335
                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2722
104062
                    if (mb_y < avctx->skip_top ||
2723
104062
                        mb_y >= s2->mb_height - avctx->skip_bottom)
2724
                        break;
2725
                }
2726
2727
111335
                if (!s2->pict_type) {
2728
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2729
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2730
                        return AVERROR_INVALIDDATA;
2731
                    break;
2732
                }
2733
2734
111335
                if (s->first_slice) {
2735
4089
                    skip_frame     = 0;
2736
4089
                    s->first_slice = 0;
2737
4089
                    if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2738
                        return ret;
2739
                }
2740
111335
                if (!s2->current_picture_ptr) {
2741
                    av_log(avctx, AV_LOG_ERROR,
2742
                           "current_picture not initialized\n");
2743
                    return AVERROR_INVALIDDATA;
2744
                }
2745
2746
111335
                if (HAVE_THREADS &&
2747
111335
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2748
14160
                    !avctx->hwaccel) {
2749
14160
                    int threshold = (s2->mb_height * s->slice_count +
2750
14160
                                     s2->slice_context_count / 2) /
2751
14160
                                    s2->slice_context_count;
2752
14160
                    av_assert0(avctx->thread_count > 1);
2753
14160
                    if (threshold <= mb_y) {
2754
4248
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2755
2756
4248
                        thread_context->start_mb_y = mb_y;
2757
4248
                        thread_context->end_mb_y   = s2->mb_height;
2758
4248
                        if (s->slice_count) {
2759
3776
                            s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2760
3776
                            ret = ff_update_duplicate_context(thread_context, s2);
2761
3776
                            if (ret < 0)
2762
                                return ret;
2763
                        }
2764
4248
                        init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2765
4248
                        s->slice_count++;
2766
                    }
2767
14160
                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
2768
                } else {
2769
97175
                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2770
97175
                    emms_c();
2771
2772
97175
                    if (ret < 0) {
2773
4
                        if (avctx->err_recognition & AV_EF_EXPLODE)
2774
                            return ret;
2775

4
                        if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2776
4
                            ff_er_add_slice(&s2->er, s2->resync_mb_x,
2777
                                            s2->resync_mb_y, s2->mb_x, s2->mb_y,
2778
                                            ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2779
                    } else {
2780
97171
                        ff_er_add_slice(&s2->er, s2->resync_mb_x,
2781
97171
                                        s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2782
                                        ER_AC_END | ER_DC_END | ER_MV_END);
2783
                    }
2784
                }
2785
            }
2786
112025
            break;
2787
        }
2788
    }
2789
}
2790
2791
4058
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2792
                             int *got_output, AVPacket *avpkt)
2793
{
2794
4058
    const uint8_t *buf = avpkt->data;
2795
    int ret;
2796
4058
    int buf_size = avpkt->size;
2797
4058
    Mpeg1Context *s = avctx->priv_data;
2798
4058
    AVFrame *picture = data;
2799
4058
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2800
2801

4058
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2802
        /* special case for last picture */
2803

129
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
2804
59
            int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2805
59
            if (ret < 0)
2806
                return ret;
2807
2808
59
            s2->next_picture_ptr = NULL;
2809
2810
59
            *got_output = 1;
2811
        }
2812
129
        return buf_size;
2813
    }
2814
2815
3929
    if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2816
49
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2817
                                           buf_size, NULL);
2818
2819
49
        if (ff_combine_frame(&s2->parse_context, next,
2820
                             (const uint8_t **) &buf, &buf_size) < 0)
2821
25
            return buf_size;
2822
    }
2823
2824
3904
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2825

3904
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2826
381
                                           || s2->codec_tag == AV_RL32("BW10")
2827
                                          ))
2828
2
        vcr2_init_sequence(avctx);
2829
2830
3904
    s->slice_count = 0;
2831
2832

3904
    if (avctx->extradata && !s->extradata_decoded) {
2833
237
        ret = decode_chunks(avctx, picture, got_output,
2834
237
                            avctx->extradata, avctx->extradata_size);
2835
237
        if (*got_output) {
2836
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2837
            av_frame_unref(picture);
2838
            *got_output = 0;
2839
        }
2840
237
        s->extradata_decoded = 1;
2841

237
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2842
            s2->current_picture_ptr = NULL;
2843
            return ret;
2844
        }
2845
    }
2846
2847
3904
    ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2848

3904
    if (ret<0 || *got_output) {
2849
3550
        s2->current_picture_ptr = NULL;
2850
2851

3550
        if (s2->timecode_frame_start != -1 && *got_output) {
2852
343
            AVFrameSideData *tcside = av_frame_new_side_data(picture,
2853
                                                             AV_FRAME_DATA_GOP_TIMECODE,
2854
                                                             sizeof(int64_t));
2855
343
            if (!tcside)
2856
                return AVERROR(ENOMEM);
2857
343
            memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2858
2859
343
            s2->timecode_frame_start = -1;
2860
        }
2861
    }
2862
2863
3904
    return ret;
2864
}
2865
2866
static void flush(AVCodecContext *avctx)
2867
{
2868
    Mpeg1Context *s = avctx->priv_data;
2869
2870
    s->sync       = 0;
2871
2872
    ff_mpeg_flush(avctx);
2873
}
2874
2875
254
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2876
{
2877
254
    Mpeg1Context *s = avctx->priv_data;
2878
2879
254
    if (s->mpeg_enc_ctx_allocated)
2880
239
        ff_mpv_common_end(&s->mpeg_enc_ctx);
2881
254
    av_freep(&s->a53_caption);
2882
254
    return 0;
2883
}
2884
2885
AVCodec ff_mpeg1video_decoder = {
2886
    .name                  = "mpeg1video",
2887
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2888
    .type                  = AVMEDIA_TYPE_VIDEO,
2889
    .id                    = AV_CODEC_ID_MPEG1VIDEO,
2890
    .priv_data_size        = sizeof(Mpeg1Context),
2891
    .init                  = mpeg_decode_init,
2892
    .close                 = mpeg_decode_end,
2893
    .decode                = mpeg_decode_frame,
2894
    .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2895
                             AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2896
                             AV_CODEC_CAP_SLICE_THREADS,
2897
    .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2898
    .flush                 = flush,
2899
    .max_lowres            = 3,
2900
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2901
    .hw_configs            = (const AVCodecHWConfigInternal*[]) {
2902
#if CONFIG_MPEG1_NVDEC_HWACCEL
2903
                               HWACCEL_NVDEC(mpeg1),
2904
#endif
2905
#if CONFIG_MPEG1_VDPAU_HWACCEL
2906
                               HWACCEL_VDPAU(mpeg1),
2907
#endif
2908
#if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2909
                               HWACCEL_VIDEOTOOLBOX(mpeg1),
2910
#endif
2911
#if CONFIG_MPEG1_XVMC_HWACCEL
2912
                               HWACCEL_XVMC(mpeg1),
2913
#endif
2914
                               NULL
2915
                           },
2916
};
2917
2918
AVCodec ff_mpeg2video_decoder = {
2919
    .name           = "mpeg2video",
2920
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2921
    .type           = AVMEDIA_TYPE_VIDEO,
2922
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2923
    .priv_data_size = sizeof(Mpeg1Context),
2924
    .init           = mpeg_decode_init,
2925
    .close          = mpeg_decode_end,
2926
    .decode         = mpeg_decode_frame,
2927
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2928
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2929
                      AV_CODEC_CAP_SLICE_THREADS,
2930
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2931
    .flush          = flush,
2932
    .max_lowres     = 3,
2933
    .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2934
    .hw_configs     = (const AVCodecHWConfigInternal*[]) {
2935
#if CONFIG_MPEG2_DXVA2_HWACCEL
2936
                        HWACCEL_DXVA2(mpeg2),
2937
#endif
2938
#if CONFIG_MPEG2_D3D11VA_HWACCEL
2939
                        HWACCEL_D3D11VA(mpeg2),
2940
#endif
2941
#if CONFIG_MPEG2_D3D11VA2_HWACCEL
2942
                        HWACCEL_D3D11VA2(mpeg2),
2943
#endif
2944
#if CONFIG_MPEG2_NVDEC_HWACCEL
2945
                        HWACCEL_NVDEC(mpeg2),
2946
#endif
2947
#if CONFIG_MPEG2_VAAPI_HWACCEL
2948
                        HWACCEL_VAAPI(mpeg2),
2949
#endif
2950
#if CONFIG_MPEG2_VDPAU_HWACCEL
2951
                        HWACCEL_VDPAU(mpeg2),
2952
#endif
2953
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2954
                        HWACCEL_VIDEOTOOLBOX(mpeg2),
2955
#endif
2956
#if CONFIG_MPEG2_XVMC_HWACCEL
2957
                        HWACCEL_XVMC(mpeg2),
2958
#endif
2959
                        NULL
2960
                    },
2961
};
2962
2963
//legacy decoder
2964
AVCodec ff_mpegvideo_decoder = {
2965
    .name           = "mpegvideo",
2966
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2967
    .type           = AVMEDIA_TYPE_VIDEO,
2968
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2969
    .priv_data_size = sizeof(Mpeg1Context),
2970
    .init           = mpeg_decode_init,
2971
    .close          = mpeg_decode_end,
2972
    .decode         = mpeg_decode_frame,
2973
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2974
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2975
    .flush          = flush,
2976
    .max_lowres     = 3,
2977
};