GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpeg12dec.c Lines: 1177 1673 70.4 %
Date: 2020-09-21 17:35:45 Branches: 644 1109 58.1 %

Line Branch Exec Source
1
/*
2
 * MPEG-1/2 decoder
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
4
 * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
/**
24
 * @file
25
 * MPEG-1/2 decoder
26
 */
27
28
#define UNCHECKED_BITSTREAM_READER 1
29
#include <inttypes.h>
30
31
#include "libavutil/attributes.h"
32
#include "libavutil/imgutils.h"
33
#include "libavutil/internal.h"
34
#include "libavutil/stereo3d.h"
35
36
#include "avcodec.h"
37
#include "bytestream.h"
38
#include "error_resilience.h"
39
#include "hwconfig.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
    AVBufferRef *a53_buf_ref;
61
    uint8_t afd;
62
    int has_afd;
63
    int slice_count;
64
    AVRational save_aspect;
65
    int save_width, save_height, save_progressive_seq;
66
    int rc_buffer_size;
67
    AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
68
    int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
69
    int tmpgexs;
70
    int first_slice;
71
    int extradata_decoded;
72
} Mpeg1Context;
73
74
#define MB_TYPE_ZERO_MV   0x20000000
75
76
static const uint32_t ptype2mb_type[7] = {
77
                    MB_TYPE_INTRA,
78
                    MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
79
                    MB_TYPE_L0,
80
                    MB_TYPE_L0 | MB_TYPE_CBP,
81
    MB_TYPE_QUANT | MB_TYPE_INTRA,
82
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
83
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
84
};
85
86
static const uint32_t btype2mb_type[11] = {
87
                    MB_TYPE_INTRA,
88
                    MB_TYPE_L1,
89
                    MB_TYPE_L1   | MB_TYPE_CBP,
90
                    MB_TYPE_L0,
91
                    MB_TYPE_L0   | MB_TYPE_CBP,
92
                    MB_TYPE_L0L1,
93
                    MB_TYPE_L0L1 | MB_TYPE_CBP,
94
    MB_TYPE_QUANT | MB_TYPE_INTRA,
95
    MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
96
    MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
97
    MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
98
};
99
100
/* as H.263, but only 17 codes */
101
4129656
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
102
{
103
    int code, sign, val, shift;
104
105
4129656
    code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
106
4129656
    if (code == 0)
107
1684185
        return pred;
108
2445471
    if (code < 0)
109
        return 0xffff;
110
111
2445471
    sign  = get_bits1(&s->gb);
112
2445471
    shift = fcode - 1;
113
2445471
    val   = code;
114
2445471
    if (shift) {
115
2103529
        val  = (val - 1) << shift;
116
2103529
        val |= get_bits(&s->gb, shift);
117
2103529
        val++;
118
    }
119
2445471
    if (sign)
120
1265834
        val = -val;
121
2445471
    val += pred;
122
123
    /* modulo decoding */
124
2445471
    return sign_extend(val, 5 + shift);
125
}
126
127
#define MAX_INDEX (64 - 1)
128
#define check_scantable_index(ctx, x)                                         \
129
    do {                                                                      \
130
        if ((x) > MAX_INDEX) {                                                \
131
            av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
132
                   ctx->mb_x, ctx->mb_y);                                     \
133
            return AVERROR_INVALIDDATA;                                       \
134
        }                                                                     \
135
    } while (0)
136
137
403118
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
138
                                           int16_t *block, int n)
139
{
140
    int level, i, j, run;
141
403118
    RLTable *rl                  = &ff_rl_mpeg1;
142
403118
    uint8_t *const scantable     = s->intra_scantable.permutated;
143
403118
    const uint16_t *quant_matrix = s->inter_matrix;
144
403118
    const int qscale             = s->qscale;
145
146
    {
147
403118
        OPEN_READER(re, &s->gb);
148
403118
        i = -1;
149
        // special case for first coefficient, no need to add second VLC table
150
403118
        UPDATE_CACHE(re, &s->gb);
151
403118
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
152
101724
            level = (3 * qscale * quant_matrix[0]) >> 5;
153
101724
            level = (level - 1) | 1;
154
101724
            if (GET_CACHE(re, &s->gb) & 0x40000000)
155
56898
                level = -level;
156
101724
            block[0] = level;
157
101724
            i++;
158
101724
            SKIP_BITS(re, &s->gb, 2);
159
101724
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
160
34285
                goto end;
161
        }
162
        /* now quantify & encode AC coefficients */
163
        for (;;) {
164
2921408
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
165
                       TEX_VLC_BITS, 2, 0);
166
167
2921408
            if (level != 0) {
168
2842322
                i += run;
169
2842322
                if (i > MAX_INDEX)
170
                    break;
171
2842322
                j = scantable[i];
172
2842322
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
173
2842322
                level = (level - 1) | 1;
174
2842322
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
175
2842322
                        SHOW_SBITS(re, &s->gb, 1);
176
2842322
                SKIP_BITS(re, &s->gb, 1);
177
            } else {
178
                /* escape */
179
79086
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
180
79086
                LAST_SKIP_BITS(re, &s->gb, 6);
181
79086
                UPDATE_CACHE(re, &s->gb);
182
79086
                level = SHOW_SBITS(re, &s->gb, 8);
183
79086
                SKIP_BITS(re, &s->gb, 8);
184
79086
                if (level == -128) {
185
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
186
                    SKIP_BITS(re, &s->gb, 8);
187
79086
                } else if (level == 0) {
188
                    level = SHOW_UBITS(re, &s->gb, 8);
189
                    SKIP_BITS(re, &s->gb, 8);
190
                }
191
79086
                i += run;
192
79086
                if (i > MAX_INDEX)
193
                    break;
194
79086
                j = scantable[i];
195
79086
                if (level < 0) {
196
38919
                    level = -level;
197
38919
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
198
38919
                    level = (level - 1) | 1;
199
38919
                    level = -level;
200
                } else {
201
40167
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
202
40167
                    level = (level - 1) | 1;
203
                }
204
            }
205
206
2921408
            block[j] = level;
207
2921408
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
208
368833
                break;
209
2552575
            UPDATE_CACHE(re, &s->gb);
210
        }
211
403118
end:
212
403118
        LAST_SKIP_BITS(re, &s->gb, 2);
213
403118
        CLOSE_READER(re, &s->gb);
214
    }
215
216
403118
    check_scantable_index(s, i);
217
218
403118
    s->block_last_index[n] = i;
219
403118
    return 0;
220
}
221
222
/**
223
 * Changing this would eat up any speed benefits it has.
224
 * Do not use "fast" flag if you need the code to be robust.
225
 */
226
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
227
                                                int16_t *block, int n)
228
{
229
    int level, i, j, run;
230
    RLTable *rl              = &ff_rl_mpeg1;
231
    uint8_t *const scantable = s->intra_scantable.permutated;
232
    const int qscale         = s->qscale;
233
234
    {
235
        OPEN_READER(re, &s->gb);
236
        i = -1;
237
        // Special case for first coefficient, no need to add second VLC table.
238
        UPDATE_CACHE(re, &s->gb);
239
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
240
            level = (3 * qscale) >> 1;
241
            level = (level - 1) | 1;
242
            if (GET_CACHE(re, &s->gb) & 0x40000000)
243
                level = -level;
244
            block[0] = level;
245
            i++;
246
            SKIP_BITS(re, &s->gb, 2);
247
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
248
                goto end;
249
        }
250
251
        /* now quantify & encode AC coefficients */
252
        for (;;) {
253
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
254
                       TEX_VLC_BITS, 2, 0);
255
256
            if (level != 0) {
257
                i += run;
258
                if (i > MAX_INDEX)
259
                    break;
260
                j = scantable[i];
261
                level = ((level * 2 + 1) * qscale) >> 1;
262
                level = (level - 1) | 1;
263
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
264
                        SHOW_SBITS(re, &s->gb, 1);
265
                SKIP_BITS(re, &s->gb, 1);
266
            } else {
267
                /* escape */
268
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
269
                LAST_SKIP_BITS(re, &s->gb, 6);
270
                UPDATE_CACHE(re, &s->gb);
271
                level = SHOW_SBITS(re, &s->gb, 8);
272
                SKIP_BITS(re, &s->gb, 8);
273
                if (level == -128) {
274
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
275
                    SKIP_BITS(re, &s->gb, 8);
276
                } else if (level == 0) {
277
                    level = SHOW_UBITS(re, &s->gb, 8);
278
                    SKIP_BITS(re, &s->gb, 8);
279
                }
280
                i += run;
281
                if (i > MAX_INDEX)
282
                    break;
283
                j = scantable[i];
284
                if (level < 0) {
285
                    level = -level;
286
                    level = ((level * 2 + 1) * qscale) >> 1;
287
                    level = (level - 1) | 1;
288
                    level = -level;
289
                } else {
290
                    level = ((level * 2 + 1) * qscale) >> 1;
291
                    level = (level - 1) | 1;
292
                }
293
            }
294
295
            block[j] = level;
296
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
297
                break;
298
            UPDATE_CACHE(re, &s->gb);
299
        }
300
end:
301
        LAST_SKIP_BITS(re, &s->gb, 2);
302
        CLOSE_READER(re, &s->gb);
303
    }
304
305
    check_scantable_index(s, i);
306
307
    s->block_last_index[n] = i;
308
    return 0;
309
}
310
311
3807658
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
312
                                               int16_t *block, int n)
313
{
314
    int level, i, j, run;
315
3807658
    RLTable *rl = &ff_rl_mpeg1;
316
3807658
    uint8_t *const scantable = s->intra_scantable.permutated;
317
    const uint16_t *quant_matrix;
318
3807658
    const int qscale = s->qscale;
319
    int mismatch;
320
321
3807658
    mismatch = 1;
322
323
    {
324
3807658
        OPEN_READER(re, &s->gb);
325
3807658
        i = -1;
326
3807658
        if (n < 4)
327
2868315
            quant_matrix = s->inter_matrix;
328
        else
329
939343
            quant_matrix = s->chroma_inter_matrix;
330
331
        // Special case for first coefficient, no need to add second VLC table.
332
3807658
        UPDATE_CACHE(re, &s->gb);
333
3807658
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
334
1330950
            level = (3 * qscale * quant_matrix[0]) >> 5;
335
1330950
            if (GET_CACHE(re, &s->gb) & 0x40000000)
336
834321
                level = -level;
337
1330950
            block[0]  = level;
338
1330950
            mismatch ^= level;
339
1330950
            i++;
340
1330950
            SKIP_BITS(re, &s->gb, 2);
341
1330950
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
342
604081
                goto end;
343
        }
344
345
        /* now quantify & encode AC coefficients */
346
        for (;;) {
347
15255123
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
348
                       TEX_VLC_BITS, 2, 0);
349
350
15255123
            if (level != 0) {
351
15003427
                i += run;
352
15003427
                if (i > MAX_INDEX)
353
                    break;
354
15003427
                j = scantable[i];
355
15003427
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
356
15003427
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
357
15003427
                        SHOW_SBITS(re, &s->gb, 1);
358
15003427
                SKIP_BITS(re, &s->gb, 1);
359
            } else {
360
                /* escape */
361
251696
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
362
251696
                LAST_SKIP_BITS(re, &s->gb, 6);
363
251696
                UPDATE_CACHE(re, &s->gb);
364
251696
                level = SHOW_SBITS(re, &s->gb, 12);
365
251696
                SKIP_BITS(re, &s->gb, 12);
366
367
251696
                i += run;
368
251696
                if (i > MAX_INDEX)
369
                    break;
370
251696
                j = scantable[i];
371
251696
                if (level < 0) {
372
122825
                    level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
373
122825
                    level = -level;
374
                } else {
375
128871
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
376
                }
377
            }
378
379
15255123
            mismatch ^= level;
380
15255123
            block[j]  = level;
381
15255123
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
382
3203577
                break;
383
12051546
            UPDATE_CACHE(re, &s->gb);
384
        }
385
3807658
end:
386
3807658
        LAST_SKIP_BITS(re, &s->gb, 2);
387
3807658
        CLOSE_READER(re, &s->gb);
388
    }
389
3807658
    block[63] ^= (mismatch & 1);
390
391
3807658
    check_scantable_index(s, i);
392
393
3807658
    s->block_last_index[n] = i;
394
3807658
    return 0;
395
}
396
397
/**
398
 * Changing this would eat up any speed benefits it has.
399
 * Do not use "fast" flag if you need the code to be robust.
400
 */
401
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
402
                                                    int16_t *block, int n)
403
{
404
    int level, i, j, run;
405
    RLTable *rl              = &ff_rl_mpeg1;
406
    uint8_t *const scantable = s->intra_scantable.permutated;
407
    const int qscale         = s->qscale;
408
    OPEN_READER(re, &s->gb);
409
    i = -1;
410
411
    // special case for first coefficient, no need to add second VLC table
412
    UPDATE_CACHE(re, &s->gb);
413
    if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
414
        level = (3 * qscale) >> 1;
415
        if (GET_CACHE(re, &s->gb) & 0x40000000)
416
            level = -level;
417
        block[0] = level;
418
        i++;
419
        SKIP_BITS(re, &s->gb, 2);
420
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
421
            goto end;
422
    }
423
424
    /* now quantify & encode AC coefficients */
425
    for (;;) {
426
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
427
428
        if (level != 0) {
429
            i += run;
430
            if (i > MAX_INDEX)
431
                break;
432
            j = scantable[i];
433
            level = ((level * 2 + 1) * qscale) >> 1;
434
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
435
                    SHOW_SBITS(re, &s->gb, 1);
436
            SKIP_BITS(re, &s->gb, 1);
437
        } else {
438
            /* escape */
439
            run = SHOW_UBITS(re, &s->gb, 6) + 1;
440
            LAST_SKIP_BITS(re, &s->gb, 6);
441
            UPDATE_CACHE(re, &s->gb);
442
            level = SHOW_SBITS(re, &s->gb, 12);
443
            SKIP_BITS(re, &s->gb, 12);
444
445
            i += run;
446
            if (i > MAX_INDEX)
447
                break;
448
            j = scantable[i];
449
            if (level < 0) {
450
                level = ((-level * 2 + 1) * qscale) >> 1;
451
                level = -level;
452
            } else {
453
                level = ((level * 2 + 1) * qscale) >> 1;
454
            }
455
        }
456
457
        block[j] = level;
458
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
459
            break;
460
461
        UPDATE_CACHE(re, &s->gb);
462
    }
463
end:
464
    LAST_SKIP_BITS(re, &s->gb, 2);
465
    CLOSE_READER(re, &s->gb);
466
467
    check_scantable_index(s, i);
468
469
    s->block_last_index[n] = i;
470
    return 0;
471
}
472
473
1624926
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
474
                                           int16_t *block, int n)
475
{
476
    int level, dc, diff, i, j, run;
477
    int component;
478
    RLTable *rl;
479
1624926
    uint8_t *const scantable = s->intra_scantable.permutated;
480
    const uint16_t *quant_matrix;
481
1624926
    const int qscale = s->qscale;
482
    int mismatch;
483
484
    /* DC coefficient */
485
1624926
    if (n < 4) {
486
1011540
        quant_matrix = s->intra_matrix;
487
1011540
        component    = 0;
488
    } else {
489
613386
        quant_matrix = s->chroma_intra_matrix;
490
613386
        component    = (n & 1) + 1;
491
    }
492
1624926
    diff = decode_dc(&s->gb, component);
493
1624926
    if (diff >= 0xffff)
494
        return AVERROR_INVALIDDATA;
495
1624926
    dc  = s->last_dc[component];
496
1624926
    dc += diff;
497
1624926
    s->last_dc[component] = dc;
498
1624926
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
499
    ff_tlog(s->avctx, "dc=%d\n", block[0]);
500
1624926
    mismatch = block[0] ^ 1;
501
1624926
    i = 0;
502
1624926
    if (s->intra_vlc_format)
503
1039632
        rl = &ff_rl_mpeg2;
504
    else
505
585294
        rl = &ff_rl_mpeg1;
506
507
    {
508
1624926
        OPEN_READER(re, &s->gb);
509
        /* now quantify & encode AC coefficients */
510
        for (;;) {
511
12775088
            UPDATE_CACHE(re, &s->gb);
512
12775088
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
513
                       TEX_VLC_BITS, 2, 0);
514
515
12775088
            if (level == 127) {
516
1624922
                break;
517
11150166
            } else if (level != 0) {
518
11027900
                i += run;
519
11027900
                if (i > MAX_INDEX)
520
4
                    break;
521
11027896
                j = scantable[i];
522
11027896
                level = (level * qscale * quant_matrix[j]) >> 4;
523
11027896
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
524
11027896
                        SHOW_SBITS(re, &s->gb, 1);
525
11027896
                LAST_SKIP_BITS(re, &s->gb, 1);
526
            } else {
527
                /* escape */
528
122266
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
529
122266
                LAST_SKIP_BITS(re, &s->gb, 6);
530
122266
                UPDATE_CACHE(re, &s->gb);
531
122266
                level = SHOW_SBITS(re, &s->gb, 12);
532
122266
                SKIP_BITS(re, &s->gb, 12);
533
122266
                i += run;
534
122266
                if (i > MAX_INDEX)
535
                    break;
536
122266
                j = scantable[i];
537
122266
                if (level < 0) {
538
53361
                    level = (-level * qscale * quant_matrix[j]) >> 4;
539
53361
                    level = -level;
540
                } else {
541
68905
                    level = (level * qscale * quant_matrix[j]) >> 4;
542
                }
543
            }
544
545
11150162
            mismatch ^= level;
546
11150162
            block[j]  = level;
547
        }
548
1624926
        CLOSE_READER(re, &s->gb);
549
    }
550
1624926
    block[63] ^= mismatch & 1;
551
552
1624926
    check_scantable_index(s, i);
553
554
1624922
    s->block_last_index[n] = i;
555
1624922
    return 0;
556
}
557
558
/**
559
 * Changing this would eat up any speed benefits it has.
560
 * Do not use "fast" flag if you need the code to be robust.
561
 */
562
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
563
                                                int16_t *block, int n)
564
{
565
    int level, dc, diff, i, j, run;
566
    int component;
567
    RLTable *rl;
568
    uint8_t *const scantable = s->intra_scantable.permutated;
569
    const uint16_t *quant_matrix;
570
    const int qscale = s->qscale;
571
572
    /* DC coefficient */
573
    if (n < 4) {
574
        quant_matrix = s->intra_matrix;
575
        component    = 0;
576
    } else {
577
        quant_matrix = s->chroma_intra_matrix;
578
        component    = (n & 1) + 1;
579
    }
580
    diff = decode_dc(&s->gb, component);
581
    if (diff >= 0xffff)
582
        return AVERROR_INVALIDDATA;
583
    dc = s->last_dc[component];
584
    dc += diff;
585
    s->last_dc[component] = dc;
586
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
587
    i = 0;
588
    if (s->intra_vlc_format)
589
        rl = &ff_rl_mpeg2;
590
    else
591
        rl = &ff_rl_mpeg1;
592
593
    {
594
        OPEN_READER(re, &s->gb);
595
        /* now quantify & encode AC coefficients */
596
        for (;;) {
597
            UPDATE_CACHE(re, &s->gb);
598
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
599
                       TEX_VLC_BITS, 2, 0);
600
601
            if (level >= 64 || i > 63) {
602
                break;
603
            } else if (level != 0) {
604
                i += run;
605
                j = scantable[i];
606
                level = (level * qscale * quant_matrix[j]) >> 4;
607
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
608
                        SHOW_SBITS(re, &s->gb, 1);
609
                LAST_SKIP_BITS(re, &s->gb, 1);
610
            } else {
611
                /* escape */
612
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
613
                LAST_SKIP_BITS(re, &s->gb, 6);
614
                UPDATE_CACHE(re, &s->gb);
615
                level = SHOW_SBITS(re, &s->gb, 12);
616
                SKIP_BITS(re, &s->gb, 12);
617
                i += run;
618
                j = scantable[i];
619
                if (level < 0) {
620
                    level = (-level * qscale * quant_matrix[j]) >> 4;
621
                    level = -level;
622
                } else {
623
                    level = (level * qscale * quant_matrix[j]) >> 4;
624
                }
625
            }
626
627
            block[j] = level;
628
        }
629
        CLOSE_READER(re, &s->gb);
630
    }
631
632
    check_scantable_index(s, i);
633
634
    s->block_last_index[n] = i;
635
    return 0;
636
}
637
638
/******************************************/
639
/* decoding */
640
641
30328
static inline int get_dmv(MpegEncContext *s)
642
{
643
30328
    if (get_bits1(&s->gb))
644
28315
        return 1 - (get_bits1(&s->gb) << 1);
645
    else
646
2013
        return 0;
647
}
648
649
/* motion type (for MPEG-2) */
650
#define MT_FIELD 1
651
#define MT_FRAME 2
652
#define MT_16X8  2
653
#define MT_DMV   3
654
655
2059378
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
656
{
657
    int i, j, k, cbp, val, mb_type, motion_type;
658
2059378
    const int mb_block_count = 4 + (1 << s->chroma_format);
659
    int ret;
660
661
    ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
662
663
    av_assert2(s->mb_skipped == 0);
664
665
2059378
    if (s->mb_skip_run-- != 0) {
666
154709
        if (s->pict_type == AV_PICTURE_TYPE_P) {
667
51652
            s->mb_skipped = 1;
668
51652
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
669
                MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
670
        } else {
671
            int mb_type;
672
673
103057
            if (s->mb_x)
674
103057
                mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
675
            else
676
                // FIXME not sure if this is allowed in MPEG at all
677
                mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
678
103057
            if (IS_INTRA(mb_type)) {
679
                av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
680
                return AVERROR_INVALIDDATA;
681
            }
682
103057
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
683
103057
                mb_type | MB_TYPE_SKIP;
684
685
103057
            if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
686
73394
                s->mb_skipped = 1;
687
        }
688
689
154709
        return 0;
690
    }
691
692
1904669
    switch (s->pict_type) {
693
204195
    default:
694
    case AV_PICTURE_TYPE_I:
695
204195
        if (get_bits1(&s->gb) == 0) {
696
16344
            if (get_bits1(&s->gb) == 0) {
697
                av_log(s->avctx, AV_LOG_ERROR,
698
                       "Invalid mb type in I-frame at %d %d\n",
699
                       s->mb_x, s->mb_y);
700
                return AVERROR_INVALIDDATA;
701
            }
702
16344
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
703
        } else {
704
187851
            mb_type = MB_TYPE_INTRA;
705
        }
706
204195
        break;
707
1069428
    case AV_PICTURE_TYPE_P:
708
1069428
        mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
709
1069428
        if (mb_type < 0) {
710
            av_log(s->avctx, AV_LOG_ERROR,
711
                   "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
712
            return AVERROR_INVALIDDATA;
713
        }
714
1069428
        mb_type = ptype2mb_type[mb_type];
715
1069428
        break;
716
631046
    case AV_PICTURE_TYPE_B:
717
631046
        mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
718
631046
        if (mb_type < 0) {
719
            av_log(s->avctx, AV_LOG_ERROR,
720
                   "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
721
            return AVERROR_INVALIDDATA;
722
        }
723
631046
        mb_type = btype2mb_type[mb_type];
724
631046
        break;
725
    }
726
    ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
727
//    motion_type = 0; /* avoid warning */
728
1904669
    if (IS_INTRA(mb_type)) {
729
273908
        s->bdsp.clear_blocks(s->block[0]);
730
731
273908
        if (!s->chroma_y_shift)
732
53810
            s->bdsp.clear_blocks(s->block[6]);
733
734
        /* compute DCT type */
735
        // FIXME: add an interlaced_dct coded var?
736
273908
        if (s->picture_structure == PICT_FRAME &&
737
230337
            !s->frame_pred_frame_dct)
738
96158
            s->interlaced_dct = get_bits1(&s->gb);
739
740
273908
        if (IS_QUANT(mb_type))
741
22653
            s->qscale = mpeg_get_qscale(s);
742
743
273908
        if (s->concealment_motion_vectors) {
744
            /* just parse them */
745
678
            if (s->picture_structure != PICT_FRAME)
746
675
                skip_bits1(&s->gb);  /* field select */
747
748
678
            s->mv[0][0][0]      =
749
678
            s->last_mv[0][0][0] =
750
678
            s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
751
                                                     s->last_mv[0][0][0]);
752
678
            s->mv[0][0][1]      =
753
678
            s->last_mv[0][0][1] =
754
678
            s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
755
                                                     s->last_mv[0][0][1]);
756
757
678
            check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
758
        } else {
759
            /* reset mv prediction */
760
273230
            memset(s->last_mv, 0, sizeof(s->last_mv));
761
        }
762
273908
        s->mb_intra = 1;
763
        // if 1, we memcpy blocks in xvmcvideo
764
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
765
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
766
767
273908
        if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
768
252887
            if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
769
                for (i = 0; i < 6; i++)
770
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
771
            } else {
772
1877809
                for (i = 0; i < mb_block_count; i++)
773
1624926
                    if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
774
4
                        return ret;
775
            }
776
        } else {
777
147147
            for (i = 0; i < 6; i++) {
778
126126
                ret = ff_mpeg1_decode_block_intra(&s->gb,
779
126126
                                                  s->intra_matrix,
780
126126
                                                  s->intra_scantable.permutated,
781
126126
                                                  s->last_dc, *s->pblocks[i],
782
                                                  i, s->qscale);
783
126126
                if (ret < 0) {
784
                    av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
785
                           s->mb_x, s->mb_y);
786
                    return ret;
787
                }
788
789
126126
                s->block_last_index[i] = ret;
790
            }
791
        }
792
    } else {
793
1630761
        if (mb_type & MB_TYPE_ZERO_MV) {
794
            av_assert2(mb_type & MB_TYPE_CBP);
795
796
154462
            s->mv_dir = MV_DIR_FORWARD;
797
154462
            if (s->picture_structure == PICT_FRAME) {
798
64497
                if (s->picture_structure == PICT_FRAME
799
64497
                    && !s->frame_pred_frame_dct)
800
39580
                    s->interlaced_dct = get_bits1(&s->gb);
801
64497
                s->mv_type = MV_TYPE_16X16;
802
            } else {
803
89965
                s->mv_type            = MV_TYPE_FIELD;
804
89965
                mb_type              |= MB_TYPE_INTERLACED;
805
89965
                s->field_select[0][0] = s->picture_structure - 1;
806
            }
807
808
154462
            if (IS_QUANT(mb_type))
809
38251
                s->qscale = mpeg_get_qscale(s);
810
811
154462
            s->last_mv[0][0][0] = 0;
812
154462
            s->last_mv[0][0][1] = 0;
813
154462
            s->last_mv[0][1][0] = 0;
814
154462
            s->last_mv[0][1][1] = 0;
815
154462
            s->mv[0][0][0]      = 0;
816
154462
            s->mv[0][0][1]      = 0;
817
        } else {
818
            av_assert2(mb_type & MB_TYPE_L0L1);
819
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
820
            /* get additional motion vector type */
821

1476299
            if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
822
603374
                motion_type = MT_FRAME;
823
            } else {
824
872925
                motion_type = get_bits(&s->gb, 2);
825

872925
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
826
357276
                    s->interlaced_dct = get_bits1(&s->gb);
827
            }
828
829
1476299
            if (IS_QUANT(mb_type))
830
135734
                s->qscale = mpeg_get_qscale(s);
831
832
            /* motion vectors */
833
1476299
            s->mv_dir = (mb_type >> 13) & 3;
834
            ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
835

1476299
            switch (motion_type) {
836
1236664
            case MT_FRAME: /* or MT_16X8 */
837
1236664
                if (s->picture_structure == PICT_FRAME) {
838
1034164
                    mb_type   |= MB_TYPE_16x16;
839
1034164
                    s->mv_type = MV_TYPE_16X16;
840
3102492
                    for (i = 0; i < 2; i++) {
841
2068328
                        if (USES_LIST(mb_type, i)) {
842
                            /* MT_FRAME */
843
1323224
                            s->mv[i][0][0]      =
844
1323224
                            s->last_mv[i][0][0] =
845
1323224
                            s->last_mv[i][1][0] =
846
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0],
847
                                                   s->last_mv[i][0][0]);
848
1323224
                            s->mv[i][0][1]      =
849
1323224
                            s->last_mv[i][0][1] =
850
1323224
                            s->last_mv[i][1][1] =
851
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1],
852
                                                   s->last_mv[i][0][1]);
853
                            /* full_pel: only for MPEG-1 */
854
1323224
                            if (s->full_pel[i]) {
855
                                s->mv[i][0][0] *= 2;
856
                                s->mv[i][0][1] *= 2;
857
                            }
858
                        }
859
                    }
860
                } else {
861
202500
                    mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
862
202500
                    s->mv_type = MV_TYPE_16X8;
863
607500
                    for (i = 0; i < 2; i++) {
864
405000
                        if (USES_LIST(mb_type, i)) {
865
                            /* MT_16X8 */
866
609543
                            for (j = 0; j < 2; j++) {
867
406362
                                s->field_select[i][j] = get_bits1(&s->gb);
868
1219086
                                for (k = 0; k < 2; k++) {
869
812724
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
870
                                                             s->last_mv[i][j][k]);
871
812724
                                    s->last_mv[i][j][k] = val;
872
812724
                                    s->mv[i][j][k]      = val;
873
                                }
874
                            }
875
                        }
876
                    }
877
                }
878
1236664
                break;
879
224471
            case MT_FIELD:
880
224471
                s->mv_type = MV_TYPE_FIELD;
881
224471
                if (s->picture_structure == PICT_FRAME) {
882
63707
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
883
191121
                    for (i = 0; i < 2; i++) {
884
127414
                        if (USES_LIST(mb_type, i)) {
885
230964
                            for (j = 0; j < 2; j++) {
886
153976
                                s->field_select[i][j] = get_bits1(&s->gb);
887
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
888
                                                         s->last_mv[i][j][0]);
889
153976
                                s->last_mv[i][j][0] = val;
890
153976
                                s->mv[i][j][0]      = val;
891
                                ff_tlog(s->avctx, "fmx=%d\n", val);
892
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
893
153976
                                                         s->last_mv[i][j][1] >> 1);
894
153976
                                s->last_mv[i][j][1] = 2 * val;
895
153976
                                s->mv[i][j][1]      = val;
896
                                ff_tlog(s->avctx, "fmy=%d\n", val);
897
                            }
898
                        }
899
                    }
900
                } else {
901
160764
                    av_assert0(!s->progressive_sequence);
902
160764
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
903
482292
                    for (i = 0; i < 2; i++) {
904
321528
                        if (USES_LIST(mb_type, i)) {
905
165424
                            s->field_select[i][0] = get_bits1(&s->gb);
906
496272
                            for (k = 0; k < 2; k++) {
907
330848
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
908
                                                         s->last_mv[i][0][k]);
909
330848
                                s->last_mv[i][0][k] = val;
910
330848
                                s->last_mv[i][1][k] = val;
911
330848
                                s->mv[i][0][k]      = val;
912
                            }
913
                        }
914
                    }
915
                }
916
224471
                break;
917
15164
            case MT_DMV:
918
15164
                if (s->progressive_sequence){
919
                    av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
920
                    return AVERROR_INVALIDDATA;
921
                }
922
15164
                s->mv_type = MV_TYPE_DMV;
923
45492
                for (i = 0; i < 2; i++) {
924
30328
                    if (USES_LIST(mb_type, i)) {
925
                        int dmx, dmy, mx, my, m;
926
15164
                        const int my_shift = s->picture_structure == PICT_FRAME;
927
928
15164
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
929
                                                s->last_mv[i][0][0]);
930
15164
                        s->last_mv[i][0][0] = mx;
931
15164
                        s->last_mv[i][1][0] = mx;
932
15164
                        dmx = get_dmv(s);
933
15164
                        my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
934
15164
                                                 s->last_mv[i][0][1] >> my_shift);
935
15164
                        dmy = get_dmv(s);
936
937
938
15164
                        s->last_mv[i][0][1] = my * (1 << my_shift);
939
15164
                        s->last_mv[i][1][1] = my * (1 << my_shift);
940
941
15164
                        s->mv[i][0][0] = mx;
942
15164
                        s->mv[i][0][1] = my;
943
15164
                        s->mv[i][1][0] = mx; // not used
944
15164
                        s->mv[i][1][1] = my; // not used
945
946
15164
                        if (s->picture_structure == PICT_FRAME) {
947
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
948
949
                            // m = 1 + 2 * s->top_field_first;
950
                            m = s->top_field_first ? 1 : 3;
951
952
                            /* top -> top pred */
953
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
954
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
955
                            m = 4 - m;
956
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
957
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
958
                        } else {
959
15164
                            mb_type |= MB_TYPE_16x16;
960
961
15164
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
962
15164
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
963
15164
                            if (s->picture_structure == PICT_TOP_FIELD)
964
13048
                                s->mv[i][2][1]--;
965
                            else
966
2116
                                s->mv[i][2][1]++;
967
                        }
968
                    }
969
                }
970
15164
                break;
971
            default:
972
                av_log(s->avctx, AV_LOG_ERROR,
973
                       "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
974
                return AVERROR_INVALIDDATA;
975
            }
976
        }
977
978
1630761
        s->mb_intra = 0;
979
1630761
        if (HAS_CBP(mb_type)) {
980
1295669
            s->bdsp.clear_blocks(s->block[0]);
981
982
1295669
            cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
983
1295669
            if (mb_block_count > 6) {
984
46345
                cbp *= 1 << mb_block_count - 6;
985
46345
                cbp  |= get_bits(&s->gb, mb_block_count - 6);
986
46345
                s->bdsp.clear_blocks(s->block[6]);
987
            }
988
1295669
            if (cbp <= 0) {
989
                av_log(s->avctx, AV_LOG_ERROR,
990
                       "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
991
                return AVERROR_INVALIDDATA;
992
            }
993
994
            // if 1, we memcpy blocks in xvmcvideo
995
            if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
996
                ff_xvmc_pack_pblocks(s, cbp);
997
998
1295669
            if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
999
1183927
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1000
                    for (i = 0; i < 6; i++) {
1001
                        if (cbp & 32)
1002
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1003
                        else
1004
                            s->block_last_index[i] = -1;
1005
                        cbp += cbp;
1006
                    }
1007
                } else {
1008
1183927
                    cbp <<= 12 - mb_block_count;
1009
1010
8380179
                    for (i = 0; i < mb_block_count; i++) {
1011
7196252
                        if (cbp & (1 << 11)) {
1012
3807658
                            if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1013
                                return ret;
1014
                        } else {
1015
3388594
                            s->block_last_index[i] = -1;
1016
                        }
1017
7196252
                        cbp += cbp;
1018
                    }
1019
                }
1020
            } else {
1021
111742
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1022
                    for (i = 0; i < 6; i++) {
1023
                        if (cbp & 32)
1024
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1025
                        else
1026
                            s->block_last_index[i] = -1;
1027
                        cbp += cbp;
1028
                    }
1029
                } else {
1030
782194
                    for (i = 0; i < 6; i++) {
1031
670452
                        if (cbp & 32) {
1032
403118
                            if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1033
                                return ret;
1034
                        } else {
1035
267334
                            s->block_last_index[i] = -1;
1036
                        }
1037
670452
                        cbp += cbp;
1038
                    }
1039
                }
1040
            }
1041
        } else {
1042
4356196
            for (i = 0; i < 12; i++)
1043
4021104
                s->block_last_index[i] = -1;
1044
        }
1045
    }
1046
1047
1904665
    s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1048
1049
1904665
    return 0;
1050
}
1051
1052
255
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1053
{
1054
255
    Mpeg1Context *s    = avctx->priv_data;
1055
255
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1056
1057
255
    ff_mpv_decode_defaults(s2);
1058
1059
255
    if (   avctx->codec_tag != AV_RL32("VCR2")
1060
253
        && avctx->codec_tag != AV_RL32("BW10"))
1061
253
        avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1062
255
    ff_mpv_decode_init(s2, avctx);
1063
1064
255
    s->mpeg_enc_ctx.avctx  = avctx;
1065
1066
    /* we need some permutation to store matrices,
1067
     * until the decoder sets the real permutation. */
1068
255
    ff_mpv_idct_init(s2);
1069
255
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1070
255
    ff_mpeg12_init_vlcs();
1071
1072
255
    s2->chroma_format              = 1;
1073
255
    s->mpeg_enc_ctx_allocated      = 0;
1074
255
    s->mpeg_enc_ctx.picture_number = 0;
1075
255
    s->repeat_field                = 0;
1076
255
    s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1077
255
    avctx->color_range             = AVCOL_RANGE_MPEG;
1078
255
    return 0;
1079
}
1080
1081
#if HAVE_THREADS
1082
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1083
                                             const AVCodecContext *avctx_from)
1084
{
1085
    Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1086
    MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1087
    int err;
1088
1089
    if (avctx == avctx_from               ||
1090
        !ctx_from->mpeg_enc_ctx_allocated ||
1091
        !s1->context_initialized)
1092
        return 0;
1093
1094
    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1095
    if (err)
1096
        return err;
1097
1098
    if (!ctx->mpeg_enc_ctx_allocated)
1099
        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1100
1101
    if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1102
        s->picture_number++;
1103
1104
    return 0;
1105
}
1106
#endif
1107
1108
956
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1109
                                 const uint8_t *new_perm)
1110
{
1111
    uint16_t temp_matrix[64];
1112
    int i;
1113
1114
956
    memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1115
1116
62140
    for (i = 0; i < 64; i++)
1117
61184
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1118
956
}
1119
1120
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1121
#if CONFIG_MPEG1_NVDEC_HWACCEL
1122
    AV_PIX_FMT_CUDA,
1123
#endif
1124
#if CONFIG_MPEG1_XVMC_HWACCEL
1125
    AV_PIX_FMT_XVMC,
1126
#endif
1127
#if CONFIG_MPEG1_VDPAU_HWACCEL
1128
    AV_PIX_FMT_VDPAU,
1129
#endif
1130
    AV_PIX_FMT_YUV420P,
1131
    AV_PIX_FMT_NONE
1132
};
1133
1134
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1135
#if CONFIG_MPEG2_NVDEC_HWACCEL
1136
    AV_PIX_FMT_CUDA,
1137
#endif
1138
#if CONFIG_MPEG2_XVMC_HWACCEL
1139
    AV_PIX_FMT_XVMC,
1140
#endif
1141
#if CONFIG_MPEG2_VDPAU_HWACCEL
1142
    AV_PIX_FMT_VDPAU,
1143
#endif
1144
#if CONFIG_MPEG2_DXVA2_HWACCEL
1145
    AV_PIX_FMT_DXVA2_VLD,
1146
#endif
1147
#if CONFIG_MPEG2_D3D11VA_HWACCEL
1148
    AV_PIX_FMT_D3D11VA_VLD,
1149
    AV_PIX_FMT_D3D11,
1150
#endif
1151
#if CONFIG_MPEG2_VAAPI_HWACCEL
1152
    AV_PIX_FMT_VAAPI,
1153
#endif
1154
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1155
    AV_PIX_FMT_VIDEOTOOLBOX,
1156
#endif
1157
    AV_PIX_FMT_YUV420P,
1158
    AV_PIX_FMT_NONE
1159
};
1160
1161
static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1162
    AV_PIX_FMT_YUV422P,
1163
    AV_PIX_FMT_NONE
1164
};
1165
1166
static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1167
    AV_PIX_FMT_YUV444P,
1168
    AV_PIX_FMT_NONE
1169
};
1170
1171
241
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1172
{
1173
241
    Mpeg1Context *s1  = avctx->priv_data;
1174
241
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1175
    const enum AVPixelFormat *pix_fmts;
1176
1177
    if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1178
        return AV_PIX_FMT_GRAY8;
1179
1180
241
    if (s->chroma_format < 2)
1181
185
        pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1182
185
                                mpeg1_hwaccel_pixfmt_list_420 :
1183
                                mpeg2_hwaccel_pixfmt_list_420;
1184
56
    else if (s->chroma_format == 2)
1185
56
        pix_fmts = mpeg12_pixfmt_list_422;
1186
    else
1187
        pix_fmts = mpeg12_pixfmt_list_444;
1188
1189
241
    return ff_thread_get_format(avctx, pix_fmts);
1190
}
1191
1192
241
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1193
{
1194
    // until then pix_fmt may be changed right after codec init
1195
241
    if (avctx->hwaccel)
1196
        if (avctx->idct_algo == FF_IDCT_AUTO)
1197
            avctx->idct_algo = FF_IDCT_NONE;
1198
1199

241
    if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1200
        Mpeg1Context *s1 = avctx->priv_data;
1201
        MpegEncContext *s = &s1->mpeg_enc_ctx;
1202
1203
        s->pack_pblocks = 1;
1204
    }
1205
241
}
1206
1207
/* Call this function when we know all parameters.
1208
 * It may be called in different places for MPEG-1 and MPEG-2. */
1209
4454
static int mpeg_decode_postinit(AVCodecContext *avctx)
1210
{
1211
4454
    Mpeg1Context *s1  = avctx->priv_data;
1212
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1213
    uint8_t old_permutation[64];
1214
    int ret;
1215
1216
4454
    if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1217
        // MPEG-1 aspect
1218
494
        AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1219
494
        avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1220
    } else { // MPEG-2
1221
        // MPEG-2 aspect
1222
3960
        if (s->aspect_ratio_info > 1) {
1223
            AVRational dar =
1224
1947
                av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1225
1947
                                  (AVRational) { s1->pan_scan.width,
1226
1947
                                                 s1->pan_scan.height }),
1227
1947
                         (AVRational) { s->width, s->height });
1228
1229
            /* We ignore the spec here and guess a bit as reality does not
1230
             * match the spec, see for example res_change_ffmpeg_aspect.ts
1231
             * and sequence-display-aspect.mpg.
1232
             * issue1613, 621, 562 */
1233

2239
            if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1234
306
                (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1235
14
                 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1236
1669
                s->avctx->sample_aspect_ratio =
1237
1669
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1238
1669
                             (AVRational) { s->width, s->height });
1239
            } else {
1240
278
                s->avctx->sample_aspect_ratio =
1241
278
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1242
278
                             (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1243
// issue1613 4/3 16/9 -> 16/9
1244
// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1245
// widescreen-issue562.mpg 4/3 16/9 -> 16/9
1246
//                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1247
                ff_dlog(avctx, "aspect A %d/%d\n",
1248
                        ff_mpeg2_aspect[s->aspect_ratio_info].num,
1249
                        ff_mpeg2_aspect[s->aspect_ratio_info].den);
1250
                ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1251
                        s->avctx->sample_aspect_ratio.den);
1252
            }
1253
        } else {
1254
2013
            s->avctx->sample_aspect_ratio =
1255
2013
                ff_mpeg2_aspect[s->aspect_ratio_info];
1256
        }
1257
    } // MPEG-2
1258
1259
4454
    if (av_image_check_sar(s->width, s->height,
1260
                           avctx->sample_aspect_ratio) < 0) {
1261
        av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1262
                avctx->sample_aspect_ratio.num,
1263
                avctx->sample_aspect_ratio.den);
1264
        avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1265
    }
1266
1267
4454
    if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1268
4217
        avctx->coded_width       != s->width                ||
1269
4217
        avctx->coded_height      != s->height               ||
1270
4217
        s1->save_width           != s->width                ||
1271

8434
        s1->save_height          != s->height               ||
1272
4217
        av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1273

4215
        (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1274
        0) {
1275
239
        if (s1->mpeg_enc_ctx_allocated) {
1276
2
            ParseContext pc = s->parse_context;
1277
2
            s->parse_context.buffer = 0;
1278
2
            ff_mpv_common_end(s);
1279
2
            s->parse_context = pc;
1280
2
            s1->mpeg_enc_ctx_allocated = 0;
1281
        }
1282
1283
239
        ret = ff_set_dimensions(avctx, s->width, s->height);
1284
239
        if (ret < 0)
1285
            return ret;
1286
1287

239
        if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1288
212
            avctx->rc_max_rate = s->bit_rate;
1289

27
        } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1290

25
                   (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1291
25
            avctx->bit_rate = s->bit_rate;
1292
        }
1293
239
        s1->save_aspect          = s->avctx->sample_aspect_ratio;
1294
239
        s1->save_width           = s->width;
1295
239
        s1->save_height          = s->height;
1296
239
        s1->save_progressive_seq = s->progressive_sequence;
1297
1298
        /* low_delay may be forced, in this case we will have B-frames
1299
         * that behave like P-frames. */
1300
239
        avctx->has_b_frames = !s->low_delay;
1301
1302
239
        if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1303
            // MPEG-1 fps
1304
25
            avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1305
25
            avctx->ticks_per_frame     = 1;
1306
1307
25
            avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1308
        } else { // MPEG-2
1309
            // MPEG-2 fps
1310
214
            av_reduce(&s->avctx->framerate.num,
1311
214
                      &s->avctx->framerate.den,
1312
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1313
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1314
                      1 << 30);
1315
214
            avctx->ticks_per_frame = 2;
1316
1317
214
            switch (s->chroma_format) {
1318
158
            case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1319
56
            case 2:
1320
56
            case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1321
            default: av_assert0(0);
1322
            }
1323
        } // MPEG-2
1324
1325
239
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1326
239
        setup_hwaccel_for_pixfmt(avctx);
1327
1328
        /* Quantization matrices may need reordering
1329
         * if DCT permutation is changed. */
1330
239
        memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1331
1332
239
        ff_mpv_idct_init(s);
1333
239
        if ((ret = ff_mpv_common_init(s)) < 0)
1334
            return ret;
1335
1336
239
        quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1337
239
        quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1338
239
        quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1339
239
        quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1340
1341
239
        s1->mpeg_enc_ctx_allocated = 1;
1342
    }
1343
4454
    return 0;
1344
}
1345
1346
4454
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1347
                                int buf_size)
1348
{
1349
4454
    Mpeg1Context *s1  = avctx->priv_data;
1350
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1351
    int ref, f_code, vbv_delay;
1352
1353
4454
    init_get_bits(&s->gb, buf, buf_size * 8);
1354
1355
4454
    ref = get_bits(&s->gb, 10); /* temporal ref */
1356
4454
    s->pict_type = get_bits(&s->gb, 3);
1357

4454
    if (s->pict_type == 0 || s->pict_type > 3)
1358
        return AVERROR_INVALIDDATA;
1359
1360
4454
    vbv_delay = get_bits(&s->gb, 16);
1361
4454
    s->vbv_delay = vbv_delay;
1362
4454
    if (s->pict_type == AV_PICTURE_TYPE_P ||
1363
2103
        s->pict_type == AV_PICTURE_TYPE_B) {
1364
3791
        s->full_pel[0] = get_bits1(&s->gb);
1365
3791
        f_code = get_bits(&s->gb, 3);
1366

3791
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1367
            return AVERROR_INVALIDDATA;
1368
3791
        f_code += !f_code;
1369
3791
        s->mpeg_f_code[0][0] = f_code;
1370
3791
        s->mpeg_f_code[0][1] = f_code;
1371
    }
1372
4454
    if (s->pict_type == AV_PICTURE_TYPE_B) {
1373
1440
        s->full_pel[1] = get_bits1(&s->gb);
1374
1440
        f_code = get_bits(&s->gb, 3);
1375

1440
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1376
            return AVERROR_INVALIDDATA;
1377
1440
        f_code += !f_code;
1378
1440
        s->mpeg_f_code[1][0] = f_code;
1379
1440
        s->mpeg_f_code[1][1] = f_code;
1380
    }
1381
4454
    s->current_picture.f->pict_type = s->pict_type;
1382
4454
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1383
1384
4454
    if (avctx->debug & FF_DEBUG_PICT_INFO)
1385
        av_log(avctx, AV_LOG_DEBUG,
1386
               "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1387
1388
4454
    s->y_dc_scale = 8;
1389
4454
    s->c_dc_scale = 8;
1390
4454
    return 0;
1391
}
1392
1393
649
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1394
{
1395
649
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1396
    int horiz_size_ext, vert_size_ext;
1397
    int bit_rate_ext;
1398
    AVCPBProperties *cpb_props;
1399
1400
649
    skip_bits(&s->gb, 1); /* profile and level esc*/
1401
649
    s->avctx->profile       = get_bits(&s->gb, 3);
1402
649
    s->avctx->level         = get_bits(&s->gb, 4);
1403
649
    s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1404
649
    s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1405
1406
649
    if (!s->chroma_format) {
1407
        s->chroma_format = 1;
1408
        av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1409
    }
1410
1411
649
    horiz_size_ext          = get_bits(&s->gb, 2);
1412
649
    vert_size_ext           = get_bits(&s->gb, 2);
1413
649
    s->width  |= (horiz_size_ext << 12);
1414
649
    s->height |= (vert_size_ext  << 12);
1415
649
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1416
649
    s->bit_rate += (bit_rate_ext << 18) * 400LL;
1417
649
    check_marker(s->avctx, &s->gb, "after bit rate extension");
1418
649
    s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1419
1420
649
    s->low_delay = get_bits1(&s->gb);
1421
649
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1422
        s->low_delay = 1;
1423
1424
649
    s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1425
649
    s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1426
1427
    ff_dlog(s->avctx, "sequence extension\n");
1428
649
    s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1429
1430
649
    if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1431
649
        cpb_props->buffer_size = s1->rc_buffer_size;
1432
649
        if (s->bit_rate != 0x3FFFF*400)
1433
232
            cpb_props->max_bitrate = s->bit_rate;
1434
    }
1435
1436
649
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1437
        av_log(s->avctx, AV_LOG_DEBUG,
1438
               "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1439
               s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1440
               s1->rc_buffer_size, s->bit_rate);
1441
649
}
1442
1443
61
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1444
{
1445
61
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1446
    int color_description, w, h;
1447
1448
61
    skip_bits(&s->gb, 3); /* video format */
1449
61
    color_description = get_bits1(&s->gb);
1450
61
    if (color_description) {
1451
29
        s->avctx->color_primaries = get_bits(&s->gb, 8);
1452
29
        s->avctx->color_trc       = get_bits(&s->gb, 8);
1453
29
        s->avctx->colorspace      = get_bits(&s->gb, 8);
1454
    }
1455
61
    w = get_bits(&s->gb, 14);
1456
61
    skip_bits(&s->gb, 1); // marker
1457
61
    h = get_bits(&s->gb, 14);
1458
    // remaining 3 bits are zero padding
1459
1460
61
    s1->pan_scan.width  = 16 * w;
1461
61
    s1->pan_scan.height = 16 * h;
1462
1463
61
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1464
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1465
61
}
1466
1467
15
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1468
{
1469
15
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1470
    int i, nofco;
1471
1472
15
    nofco = 1;
1473
15
    if (s->progressive_sequence) {
1474
        if (s->repeat_first_field) {
1475
            nofco++;
1476
            if (s->top_field_first)
1477
                nofco++;
1478
        }
1479
    } else {
1480
15
        if (s->picture_structure == PICT_FRAME) {
1481
5
            nofco++;
1482
5
            if (s->repeat_first_field)
1483
3
                nofco++;
1484
        }
1485
    }
1486
38
    for (i = 0; i < nofco; i++) {
1487
23
        s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1488
23
        skip_bits(&s->gb, 1); // marker
1489
23
        s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1490
23
        skip_bits(&s->gb, 1); // marker
1491
    }
1492
1493
15
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1494
        av_log(s->avctx, AV_LOG_DEBUG,
1495
               "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1496
               s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1497
               s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1498
               s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1499
15
}
1500
1501
147
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1502
                       uint16_t matrix1[64], int intra)
1503
{
1504
    int i;
1505
1506
9555
    for (i = 0; i < 64; i++) {
1507
9408
        int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1508
9408
        int v = get_bits(&s->gb, 8);
1509
9408
        if (v == 0) {
1510
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1511
            return AVERROR_INVALIDDATA;
1512
        }
1513

9408
        if (intra && i == 0 && v != 8) {
1514
            av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1515
            v = 8; // needed by pink.mpg / issue1046
1516
        }
1517
9408
        matrix0[j] = v;
1518
9408
        if (matrix1)
1519
8960
            matrix1[j] = v;
1520
    }
1521
147
    return 0;
1522
}
1523
1524
692
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1525
{
1526
    ff_dlog(s->avctx, "matrix extension\n");
1527
1528
692
    if (get_bits1(&s->gb))
1529
19
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1530
692
    if (get_bits1(&s->gb))
1531
49
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1532
692
    if (get_bits1(&s->gb))
1533
6
        load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1534
692
    if (get_bits1(&s->gb))
1535
1
        load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1536
692
}
1537
1538
3960
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1539
{
1540
3960
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1541
1542
3960
    s->full_pel[0]       = s->full_pel[1] = 0;
1543
3960
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1544
3960
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1545
3960
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1546
3960
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1547

3960
    if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1548
        av_log(s->avctx, AV_LOG_ERROR,
1549
               "Missing picture start code, guessing missing values\n");
1550
        if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1551
            if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1552
                s->pict_type = AV_PICTURE_TYPE_I;
1553
            else
1554
                s->pict_type = AV_PICTURE_TYPE_P;
1555
        } else
1556
            s->pict_type = AV_PICTURE_TYPE_B;
1557
        s->current_picture.f->pict_type = s->pict_type;
1558
        s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1559
    }
1560
3960
    s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1561
3960
    s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1562
3960
    s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1563
3960
    s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1564
1565
3960
    s->intra_dc_precision         = get_bits(&s->gb, 2);
1566
3960
    s->picture_structure          = get_bits(&s->gb, 2);
1567
3960
    s->top_field_first            = get_bits1(&s->gb);
1568
3960
    s->frame_pred_frame_dct       = get_bits1(&s->gb);
1569
3960
    s->concealment_motion_vectors = get_bits1(&s->gb);
1570
3960
    s->q_scale_type               = get_bits1(&s->gb);
1571
3960
    s->intra_vlc_format           = get_bits1(&s->gb);
1572
3960
    s->alternate_scan             = get_bits1(&s->gb);
1573
3960
    s->repeat_first_field         = get_bits1(&s->gb);
1574
3960
    s->chroma_420_type            = get_bits1(&s->gb);
1575
3960
    s->progressive_frame          = get_bits1(&s->gb);
1576
1577
3960
    if (s->alternate_scan) {
1578
945
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1579
945
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1580
    } else {
1581
3015
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1582
3015
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1583
    }
1584
1585
    /* composite display not parsed */
1586
    ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1587
    ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1588
    ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1589
    ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1590
    ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1591
    ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1592
    ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1593
    ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1594
    ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1595
3960
}
1596
1597
4089
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1598
{
1599
4089
    AVCodecContext *avctx = s->avctx;
1600
4089
    Mpeg1Context *s1      = (Mpeg1Context *) s;
1601
    int ret;
1602
1603
4089
    if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1604
4089
        if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1605
            return AVERROR_INVALIDDATA;
1606
    }
1607
1608
    /* start frame decoding */
1609

7576
    if (s->first_field || s->picture_structure == PICT_FRAME) {
1610
        AVFrameSideData *pan_scan;
1611
1612
3487
        if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1613
            return ret;
1614
1615
3487
        ff_mpeg_er_frame_start(s);
1616
1617
        /* first check if we must repeat the frame */
1618
3487
        s->current_picture_ptr->f->repeat_pict = 0;
1619
3487
        if (s->repeat_first_field) {
1620
3
            if (s->progressive_sequence) {
1621
                if (s->top_field_first)
1622
                    s->current_picture_ptr->f->repeat_pict = 4;
1623
                else
1624
                    s->current_picture_ptr->f->repeat_pict = 2;
1625
3
            } else if (s->progressive_frame) {
1626
3
                s->current_picture_ptr->f->repeat_pict = 1;
1627
            }
1628
        }
1629
1630
3487
        pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1631
                                          AV_FRAME_DATA_PANSCAN,
1632
                                          sizeof(s1->pan_scan));
1633
3487
        if (!pan_scan)
1634
            return AVERROR(ENOMEM);
1635
3487
        memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1636
1637
3487
        if (s1->a53_buf_ref) {
1638
472
            AVFrameSideData *sd = av_frame_new_side_data_from_buf(
1639
472
                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1640
                s1->a53_buf_ref);
1641
472
            if (!sd)
1642
                av_buffer_unref(&s1->a53_buf_ref);
1643
472
            s1->a53_buf_ref = NULL;
1644
        }
1645
1646
3487
        if (s1->has_stereo3d) {
1647
            AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1648
            if (!stereo)
1649
                return AVERROR(ENOMEM);
1650
1651
            *stereo = s1->stereo3d;
1652
            s1->has_stereo3d = 0;
1653
        }
1654
1655
3487
        if (s1->has_afd) {
1656
            AVFrameSideData *sd =
1657
202
                av_frame_new_side_data(s->current_picture_ptr->f,
1658
                                       AV_FRAME_DATA_AFD, 1);
1659
202
            if (!sd)
1660
                return AVERROR(ENOMEM);
1661
1662
202
            *sd->data   = s1->afd;
1663
202
            s1->has_afd = 0;
1664
        }
1665
1666
3487
        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1667
            ff_thread_finish_setup(avctx);
1668
    } else { // second field
1669
        int i;
1670
1671
602
        if (!s->current_picture_ptr) {
1672
            av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1673
            return AVERROR_INVALIDDATA;
1674
        }
1675
1676
602
        if (s->avctx->hwaccel) {
1677
            if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1678
                av_log(avctx, AV_LOG_ERROR,
1679
                       "hardware accelerator failed to decode first field\n");
1680
                return ret;
1681
            }
1682
        }
1683
1684
3010
        for (i = 0; i < 4; i++) {
1685
2408
            s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1686
2408
            if (s->picture_structure == PICT_BOTTOM_FIELD)
1687
4
                s->current_picture.f->data[i] +=
1688
4
                    s->current_picture_ptr->f->linesize[i];
1689
        }
1690
    }
1691
1692
4089
    if (avctx->hwaccel) {
1693
        if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1694
            return ret;
1695
    }
1696
1697
4089
    return 0;
1698
}
1699
1700
#define DECODE_SLICE_ERROR -1
1701
#define DECODE_SLICE_OK     0
1702
1703
/**
1704
 * Decode a slice.
1705
 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1706
 * @return DECODE_SLICE_ERROR if the slice is damaged,
1707
 *         DECODE_SLICE_OK if this slice is OK
1708
 */
1709
111335
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1710
                             const uint8_t **buf, int buf_size)
1711
{
1712
111335
    AVCodecContext *avctx = s->avctx;
1713
111335
    const int lowres      = s->avctx->lowres;
1714
111335
    const int field_pic   = s->picture_structure != PICT_FRAME;
1715
    int ret;
1716
1717
111335
    s->resync_mb_x =
1718
111335
    s->resync_mb_y = -1;
1719
1720
111335
    av_assert0(mb_y < s->mb_height);
1721
1722
111335
    init_get_bits(&s->gb, *buf, buf_size * 8);
1723

111335
    if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1724
        skip_bits(&s->gb, 3);
1725
1726
111335
    ff_mpeg1_clean_buffers(s);
1727
111335
    s->interlaced_dct = 0;
1728
1729
111335
    s->qscale = mpeg_get_qscale(s);
1730
1731
111335
    if (s->qscale == 0) {
1732
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1733
        return AVERROR_INVALIDDATA;
1734
    }
1735
1736
    /* extra slice info */
1737
111335
    if (skip_1stop_8data_bits(&s->gb) < 0)
1738
        return AVERROR_INVALIDDATA;
1739
1740
111335
    s->mb_x = 0;
1741
1742

111335
    if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1743
        skip_bits1(&s->gb);
1744
    } else {
1745
123534
        while (get_bits_left(&s->gb) > 0) {
1746
123534
            int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1747
                                MBINCR_VLC_BITS, 2);
1748
123534
            if (code < 0) {
1749
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1750
                return AVERROR_INVALIDDATA;
1751
            }
1752
123534
            if (code >= 33) {
1753
12199
                if (code == 33)
1754
12199
                    s->mb_x += 33;
1755
                /* otherwise, stuffing, nothing to do */
1756
            } else {
1757
111335
                s->mb_x += code;
1758
111335
                break;
1759
            }
1760
        }
1761
    }
1762
1763
111335
    if (s->mb_x >= (unsigned) s->mb_width) {
1764
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1765
        return AVERROR_INVALIDDATA;
1766
    }
1767
1768

111335
    if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1769
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1770
        int start_code = -1;
1771
        buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1772
        if (buf_end < *buf + buf_size)
1773
            buf_end -= 4;
1774
        s->mb_y = mb_y;
1775
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1776
            return DECODE_SLICE_ERROR;
1777
        *buf = buf_end;
1778
        return DECODE_SLICE_OK;
1779
    }
1780
1781
111335
    s->resync_mb_x = s->mb_x;
1782
111335
    s->resync_mb_y = s->mb_y = mb_y;
1783
111335
    s->mb_skip_run = 0;
1784
111335
    ff_init_block_index(s);
1785
1786


111335
    if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1787
2886
        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1788
            av_log(s->avctx, AV_LOG_DEBUG,
1789
                   "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",
1790
                   s->qscale,
1791
                   s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1792
                   s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1793
                   s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1794
                   (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1795
                   (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1796
                   s->progressive_sequence ? "ps"  : "",
1797
                   s->progressive_frame    ? "pf"  : "",
1798
                   s->alternate_scan       ? "alt" : "",
1799
                   s->top_field_first      ? "top" : "",
1800
                   s->intra_dc_precision, s->picture_structure,
1801
                   s->frame_pred_frame_dct, s->concealment_motion_vectors,
1802
                   s->q_scale_type, s->intra_vlc_format,
1803
                   s->repeat_first_field, s->chroma_420_type ? "420" : "");
1804
        }
1805
    }
1806
1807
    for (;;) {
1808
        // If 1, we memcpy blocks in xvmcvideo.
1809
1948043
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1810
            ff_xvmc_init_block(s); // set s->block
1811
1812
2059378
        if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1813
4
            return ret;
1814
1815
        // Note motion_val is normally NULL unless we want to extract the MVs.
1816

2059374
        if (s->current_picture.motion_val[0] && !s->encoding) {
1817
            const int wrap = s->b8_stride;
1818
            int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1819
            int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1820
            int motion_x, motion_y, dir, i;
1821
1822
            for (i = 0; i < 2; i++) {
1823
                for (dir = 0; dir < 2; dir++) {
1824
                    if (s->mb_intra ||
1825
                        (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1826
                        motion_x = motion_y = 0;
1827
                    } else if (s->mv_type == MV_TYPE_16X16 ||
1828
                               (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1829
                        motion_x = s->mv[dir][0][0];
1830
                        motion_y = s->mv[dir][0][1];
1831
                    } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1832
                        motion_x = s->mv[dir][i][0];
1833
                        motion_y = s->mv[dir][i][1];
1834
                    }
1835
1836
                    s->current_picture.motion_val[dir][xy][0]     = motion_x;
1837
                    s->current_picture.motion_val[dir][xy][1]     = motion_y;
1838
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1839
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1840
                    s->current_picture.ref_index [dir][b8_xy]     =
1841
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1842
                    av_assert2(s->field_select[dir][i] == 0 ||
1843
                               s->field_select[dir][i] == 1);
1844
                }
1845
                xy    += wrap;
1846
                b8_xy += 2;
1847
            }
1848
        }
1849
1850
2059374
        s->dest[0] += 16 >> lowres;
1851
2059374
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1852
2059374
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1853
1854
2059374
        ff_mpv_reconstruct_mb(s, s->block);
1855
1856
2059374
        if (++s->mb_x >= s->mb_width) {
1857
66414
            const int mb_size = 16 >> s->avctx->lowres;
1858
            int left;
1859
1860
66414
            ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1861
66414
            ff_mpv_report_decode_progress(s);
1862
1863
66414
            s->mb_x  = 0;
1864
66414
            s->mb_y += 1 << field_pic;
1865
1866
66414
            if (s->mb_y >= s->mb_height) {
1867
4085
                int left   = get_bits_left(&s->gb);
1868
8431
                int is_d10 = s->chroma_format == 2 &&
1869
261
                             s->pict_type == AV_PICTURE_TYPE_I &&
1870

49
                             avctx->profile == 0 && avctx->level == 5 &&
1871
49
                             s->intra_dc_precision == 2 &&
1872

4371
                             s->q_scale_type == 1 && s->alternate_scan == 0 &&
1873
25
                             s->progressive_frame == 0
1874
                             /* vbv_delay == 0xBBB || 0xE10 */;
1875
1876

4085
                if (left >= 32 && !is_d10) {
1877
1002
                    GetBitContext gb = s->gb;
1878
1002
                    align_get_bits(&gb);
1879
1002
                    if (show_bits(&gb, 24) == 0x060E2B) {
1880
                        av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1881
                        is_d10 = 1;
1882
                    }
1883

1002
                    if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1884
                        av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1885
                        goto eos;
1886
                    }
1887
                }
1888
1889

4085
                if (left < 0 ||
1890

3788
                    (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1891

4085
                    ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1892
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1893
                           left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1894
                    return AVERROR_INVALIDDATA;
1895
                } else
1896
4085
                    goto eos;
1897
            }
1898
            // There are some files out there which are missing the last slice
1899
            // in cases where the slice is completely outside the visible
1900
            // area, we detect this here instead of running into the end expecting
1901
            // more data
1902
62329
            left = get_bits_left(&s->gb);
1903
62329
            if (s->mb_y >= ((s->height + 15) >> 4) &&
1904

200
                !s->progressive_sequence &&
1905
                left <= 25 &&
1906
                left >= 0 &&
1907
                s->mb_skip_run == -1 &&
1908
                (!left || show_bits(&s->gb, left) == 0))
1909
                goto eos;
1910
1911
62329
            ff_init_block_index(s);
1912
        }
1913
1914
        /* skip mb handling */
1915
2055289
        if (s->mb_skip_run == -1) {
1916
            /* read increment again */
1917
1900580
            s->mb_skip_run = 0;
1918
1229
            for (;;) {
1919
1901809
                int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1920
                                    MBINCR_VLC_BITS, 2);
1921
1901809
                if (code < 0) {
1922
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1923
                    return AVERROR_INVALIDDATA;
1924
                }
1925
1901809
                if (code >= 33) {
1926
108475
                    if (code == 33) {
1927
1229
                        s->mb_skip_run += 33;
1928
107246
                    } else if (code == 35) {
1929

107246
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1930
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1931
                            return AVERROR_INVALIDDATA;
1932
                        }
1933
107246
                        goto eos; /* end of slice */
1934
                    }
1935
                    /* otherwise, stuffing, nothing to do */
1936
                } else {
1937
1793334
                    s->mb_skip_run += code;
1938
1793334
                    break;
1939
                }
1940
            }
1941
1793334
            if (s->mb_skip_run) {
1942
                int i;
1943
57259
                if (s->pict_type == AV_PICTURE_TYPE_I) {
1944
                    av_log(s->avctx, AV_LOG_ERROR,
1945
                           "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1946
                    return AVERROR_INVALIDDATA;
1947
                }
1948
1949
                /* skip mb */
1950
57259
                s->mb_intra = 0;
1951
744367
                for (i = 0; i < 12; i++)
1952
687108
                    s->block_last_index[i] = -1;
1953
57259
                if (s->picture_structure == PICT_FRAME)
1954
39187
                    s->mv_type = MV_TYPE_16X16;
1955
                else
1956
18072
                    s->mv_type = MV_TYPE_FIELD;
1957
57259
                if (s->pict_type == AV_PICTURE_TYPE_P) {
1958
                    /* if P type, zero motion vector is implied */
1959
20815
                    s->mv_dir             = MV_DIR_FORWARD;
1960
20815
                    s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1961
20815
                    s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1962
20815
                    s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1963
20815
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1964
                } else {
1965
                    /* if B type, reuse previous vectors and directions */
1966
36444
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1967
36444
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1968
36444
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1969
36444
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1970
36444
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1971
36444
                    s->field_select[1][0] = (s->picture_structure - 1) & 1;
1972
                }
1973
            }
1974
        }
1975
    }
1976
111331
eos: // end of slice
1977
111331
    if (get_bits_left(&s->gb) < 0) {
1978
        av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1979
        return AVERROR_INVALIDDATA;
1980
    }
1981
111331
    *buf += (get_bits_count(&s->gb) - 1) / 8;
1982
    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);
1983
111331
    return 0;
1984
}
1985
1986
4248
static int slice_decode_thread(AVCodecContext *c, void *arg)
1987
{
1988
4248
    MpegEncContext *s   = *(void **) arg;
1989
4248
    const uint8_t *buf  = s->gb.buffer;
1990
4248
    int mb_y            = s->start_mb_y;
1991
4248
    const int field_pic = s->picture_structure != PICT_FRAME;
1992
1993
4248
    s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1994
1995
9912
    for (;;) {
1996
        uint32_t start_code;
1997
        int ret;
1998
1999
14160
        ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
2000
14160
        emms_c();
2001
        ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
2002
                ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
2003
                s->start_mb_y, s->end_mb_y, s->er.error_count);
2004
14160
        if (ret < 0) {
2005
            if (c->err_recognition & AV_EF_EXPLODE)
2006
4248
                return ret;
2007
            if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2008
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2009
                                s->mb_x, s->mb_y,
2010
                                ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2011
        } else {
2012
14160
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2013
14160
                            s->mb_x - 1, s->mb_y,
2014
                            ER_AC_END | ER_DC_END | ER_MV_END);
2015
        }
2016
2017
14160
        if (s->mb_y == s->end_mb_y)
2018
4248
            return 0;
2019
2020
9912
        start_code = -1;
2021
9912
        buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2022

9912
        if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2023
            return AVERROR_INVALIDDATA;
2024
9912
        mb_y       = start_code - SLICE_MIN_START_CODE;
2025

9912
        if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2026
            mb_y += (*buf&0xE0)<<2;
2027
9912
        mb_y <<= field_pic;
2028
9912
        if (s->picture_structure == PICT_BOTTOM_FIELD)
2029
            mb_y++;
2030
9912
        if (mb_y >= s->end_mb_y)
2031
            return AVERROR_INVALIDDATA;
2032
    }
2033
}
2034
2035
/**
2036
 * Handle slice ends.
2037
 * @return 1 if it seems to be the last slice
2038
 */
2039
3747
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2040
{
2041
3747
    Mpeg1Context *s1  = avctx->priv_data;
2042
3747
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2043
2044

3747
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2045
259
        return 0;
2046
2047
3488
    if (s->avctx->hwaccel) {
2048
        int ret = s->avctx->hwaccel->end_frame(s->avctx);
2049
        if (ret < 0) {
2050
            av_log(avctx, AV_LOG_ERROR,
2051
                   "hardware accelerator failed to decode picture\n");
2052
            return ret;
2053
        }
2054
    }
2055
2056
    /* end of slice reached */
2057

3488
    if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2058
        /* end of image */
2059
2060
3487
        ff_er_frame_end(&s->er);
2061
2062
3487
        ff_mpv_frame_end(s);
2063
2064

5160
        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2065
1673
            int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2066
1673
            if (ret < 0)
2067
                return ret;
2068
1673
            ff_print_debug_info(s, s->current_picture_ptr, pict);
2069
1673
            ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2070
        } else {
2071
1814
            if (avctx->active_thread_type & FF_THREAD_FRAME)
2072
                s->picture_number++;
2073
            /* latency of 1 frame for I- and P-frames */
2074
            /* XXX: use another variable than picture_number */
2075
1814
            if (s->last_picture_ptr) {
2076
1755
                int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2077
1755
                if (ret < 0)
2078
                    return ret;
2079
1755
                ff_print_debug_info(s, s->last_picture_ptr, pict);
2080
1755
                ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2081
            }
2082
        }
2083
2084
3487
        return 1;
2085
    } else {
2086
1
        return 0;
2087
    }
2088
}
2089
2090
741
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2091
                                 const uint8_t *buf, int buf_size)
2092
{
2093
741
    Mpeg1Context *s1  = avctx->priv_data;
2094
741
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2095
    int width, height;
2096
    int i, v, j;
2097
2098
741
    init_get_bits(&s->gb, buf, buf_size * 8);
2099
2100
741
    width  = get_bits(&s->gb, 12);
2101
741
    height = get_bits(&s->gb, 12);
2102

741
    if (width == 0 || height == 0) {
2103
        av_log(avctx, AV_LOG_WARNING,
2104
               "Invalid horizontal or vertical size value.\n");
2105
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2106
            return AVERROR_INVALIDDATA;
2107
    }
2108
741
    s->aspect_ratio_info = get_bits(&s->gb, 4);
2109
741
    if (s->aspect_ratio_info == 0) {
2110
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2111
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2112
            return AVERROR_INVALIDDATA;
2113
    }
2114
741
    s->frame_rate_index = get_bits(&s->gb, 4);
2115

741
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2116
        av_log(avctx, AV_LOG_WARNING,
2117
               "frame_rate_index %d is invalid\n", s->frame_rate_index);
2118
        s->frame_rate_index = 1;
2119
    }
2120
741
    s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2121
741
    if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2122
        return AVERROR_INVALIDDATA;
2123
    }
2124
2125
741
    s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2126
741
    skip_bits(&s->gb, 1);
2127
2128
    /* get matrix */
2129
741
    if (get_bits1(&s->gb)) {
2130
18
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2131
    } else {
2132
46995
        for (i = 0; i < 64; i++) {
2133
46272
            j = s->idsp.idct_permutation[i];
2134
46272
            v = ff_mpeg1_default_intra_matrix[i];
2135
46272
            s->intra_matrix[j]        = v;
2136
46272
            s->chroma_intra_matrix[j] = v;
2137
        }
2138
    }
2139
741
    if (get_bits1(&s->gb)) {
2140
54
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2141
    } else {
2142
44655
        for (i = 0; i < 64; i++) {
2143
43968
            int j = s->idsp.idct_permutation[i];
2144
43968
            v = ff_mpeg1_default_non_intra_matrix[i];
2145
43968
            s->inter_matrix[j]        = v;
2146
43968
            s->chroma_inter_matrix[j] = v;
2147
        }
2148
    }
2149
2150
741
    if (show_bits(&s->gb, 23) != 0) {
2151
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2152
        return AVERROR_INVALIDDATA;
2153
    }
2154
2155
741
    s->width  = width;
2156
741
    s->height = height;
2157
2158
    /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2159
741
    s->progressive_sequence = 1;
2160
741
    s->progressive_frame    = 1;
2161
741
    s->picture_structure    = PICT_FRAME;
2162
741
    s->first_field          = 0;
2163
741
    s->frame_pred_frame_dct = 1;
2164
741
    s->chroma_format        = 1;
2165
741
    s->codec_id             =
2166
741
    s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2167
741
    s->out_format           = FMT_MPEG1;
2168
741
    s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2169
741
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2170
        s->low_delay = 1;
2171
2172
741
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2173
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2174
               s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2175
2176
741
    return 0;
2177
}
2178
2179
2
static int vcr2_init_sequence(AVCodecContext *avctx)
2180
{
2181
2
    Mpeg1Context *s1  = avctx->priv_data;
2182
2
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2183
    int i, v, ret;
2184
2185
    /* start new MPEG-1 context decoding */
2186
2
    s->out_format = FMT_MPEG1;
2187
2
    if (s1->mpeg_enc_ctx_allocated) {
2188
        ff_mpv_common_end(s);
2189
        s1->mpeg_enc_ctx_allocated = 0;
2190
    }
2191
2
    s->width            = avctx->coded_width;
2192
2
    s->height           = avctx->coded_height;
2193
2
    avctx->has_b_frames = 0; // true?
2194
2
    s->low_delay        = 1;
2195
2196
2
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2197
2
    setup_hwaccel_for_pixfmt(avctx);
2198
2199
2
    ff_mpv_idct_init(s);
2200
2
    if ((ret = ff_mpv_common_init(s)) < 0)
2201
        return ret;
2202
2
    s1->mpeg_enc_ctx_allocated = 1;
2203
2204
130
    for (i = 0; i < 64; i++) {
2205
128
        int j = s->idsp.idct_permutation[i];
2206
128
        v = ff_mpeg1_default_intra_matrix[i];
2207
128
        s->intra_matrix[j]        = v;
2208
128
        s->chroma_intra_matrix[j] = v;
2209
2210
128
        v = ff_mpeg1_default_non_intra_matrix[i];
2211
128
        s->inter_matrix[j]        = v;
2212
128
        s->chroma_inter_matrix[j] = v;
2213
    }
2214
2215
2
    s->progressive_sequence  = 1;
2216
2
    s->progressive_frame     = 1;
2217
2
    s->picture_structure     = PICT_FRAME;
2218
2
    s->first_field           = 0;
2219
2
    s->frame_pred_frame_dct  = 1;
2220
2
    s->chroma_format         = 1;
2221
2
    if (s->codec_tag == AV_RL32("BW10")) {
2222
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2223
    } else {
2224
2
        s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2225
2
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2226
    }
2227
2
    s1->save_width           = s->width;
2228
2
    s1->save_height          = s->height;
2229
2
    s1->save_progressive_seq = s->progressive_sequence;
2230
2
    return 0;
2231
}
2232
2233
525
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2234
                              const uint8_t *p, int buf_size)
2235
{
2236
525
    Mpeg1Context *s1 = avctx->priv_data;
2237
2238
525
    if (buf_size >= 6 &&
2239


525
        p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2240

277
        p[4] == 3 && (p[5] & 0x40)) {
2241
        /* extract A53 Part 4 CC data */
2242
277
        int cc_count = p[5] & 0x1f;
2243

277
        if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2244
277
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2245
277
            const uint64_t new_size = (old_size + cc_count
2246
277
                                            * UINT64_C(3));
2247
            int ret;
2248
2249
277
            if (new_size > INT_MAX)
2250
                return AVERROR(EINVAL);
2251
2252
277
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2253
277
            if (ret >= 0)
2254
277
                memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
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, ret;
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
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2270
205
            const uint64_t new_size = (old_size + cc_count
2271
205
                                            * UINT64_C(3));
2272
205
            if (new_size > INT_MAX)
2273
                return AVERROR(EINVAL);
2274
2275
205
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2276
205
            if (ret >= 0) {
2277
                uint8_t field, cc1, cc2;
2278
205
                uint8_t *cap = s1->a53_buf_ref->data;
2279
2280
205
                memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2281

615
                for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2282
410
                    skip_bits(&gb, 2); // priority
2283
410
                    field = get_bits(&gb, 2);
2284
410
                    skip_bits(&gb, 5); // line_offset
2285
410
                    cc1 = get_bits(&gb, 8);
2286
410
                    cc2 = get_bits(&gb, 8);
2287
410
                    skip_bits(&gb, 1); // marker
2288
2289
410
                    if (!field) { // forbidden
2290
                        cap[0] = cap[1] = cap[2] = 0x00;
2291
                    } else {
2292
410
                        field = (field == 2 ? 1 : 0);
2293
410
                        if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2294
410
                        cap[0] = 0x04 | field;
2295
410
                        cap[1] = ff_reverse[cc1];
2296
410
                        cap[2] = ff_reverse[cc2];
2297
                    }
2298
410
                    cap += 3;
2299
                }
2300
            }
2301
205
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2302
        }
2303
205
        return 1;
2304
43
    } else if (buf_size >= 11 &&
2305


43
               p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2306
        /* extract DVD CC data
2307
         *
2308
         * uint32_t   user_data_start_code        0x000001B2    (big endian)
2309
         * uint16_t   user_identifier             0x4343 "CC"
2310
         * uint8_t    user_data_type_code         0x01
2311
         * uint8_t    caption_block_size          0xF8
2312
         * uint8_t
2313
         *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2314
         *   bit 6    caption_filler              0
2315
         *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2316
         *   bit 0    caption_extra_field_added   1=one additional caption word
2317
         *
2318
         * struct caption_field_block {
2319
         *   uint8_t
2320
         *     bit 7:1 caption_filler             0x7F (all 1s)
2321
         *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2322
         *   uint8_t   caption_first_byte
2323
         *   uint8_t   caption_second_byte
2324
         * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2325
         *
2326
         * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2327
         * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2328
         * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2329
         * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2330
         * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2331
        int cc_count = 0;
2332
        int i, ret;
2333
        // There is a caption count field in the data, but it is often
2334
        // incorrect.  So count the number of captions present.
2335
        for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2336
            cc_count++;
2337
        // Transform the DVD format into A53 Part 4 format
2338
        if (cc_count > 0) {
2339
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2340
            const uint64_t new_size = (old_size + cc_count
2341
                                            * UINT64_C(6));
2342
            if (new_size > INT_MAX)
2343
                return AVERROR(EINVAL);
2344
2345
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2346
            if (ret >= 0) {
2347
                uint8_t field1 = !!(p[4] & 0x80);
2348
                uint8_t *cap = s1->a53_buf_ref->data;
2349
                p += 5;
2350
                for (i = 0; i < cc_count; i++) {
2351
                    cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2352
                    cap[1] = p[1];
2353
                    cap[2] = p[2];
2354
                    cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2355
                    cap[4] = p[4];
2356
                    cap[5] = p[5];
2357
                    cap += 6;
2358
                    p += 6;
2359
                }
2360
            }
2361
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2362
        }
2363
        return 1;
2364
    }
2365
43
    return 0;
2366
}
2367
2368
732
static void mpeg_decode_user_data(AVCodecContext *avctx,
2369
                                  const uint8_t *p, int buf_size)
2370
{
2371
732
    Mpeg1Context *s = avctx->priv_data;
2372
732
    const uint8_t *buf_end = p + buf_size;
2373
732
    Mpeg1Context *s1 = avctx->priv_data;
2374
2375
#if 0
2376
    int i;
2377
    for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2378
        av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2379
    }
2380
    av_log(avctx, AV_LOG_ERROR, "\n");
2381
#endif
2382
2383
732
    if (buf_size > 29){
2384
        int i;
2385
15372
        for(i=0; i<20; i++)
2386
14640
            if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2387
                s->tmpgexs= 1;
2388
            }
2389
    }
2390
    /* we parse the DTG active format information */
2391
732
    if (buf_end - p >= 5 &&
2392


939
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2393
207
        int flags = p[4];
2394
207
        p += 5;
2395
207
        if (flags & 0x80) {
2396
            /* skip event id */
2397
            p += 2;
2398
        }
2399
207
        if (flags & 0x40) {
2400
207
            if (buf_end - p < 1)
2401
                return;
2402
207
            s1->has_afd = 1;
2403
207
            s1->afd     = p[0] & 0x0f;
2404
        }
2405
525
    } else if (buf_end - p >= 6 &&
2406


525
               p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2407
               p[4] == 0x03) { // S3D_video_format_length
2408
        // the 0x7F mask ignores the reserved_bit value
2409
        const uint8_t S3D_video_format_type = p[5] & 0x7F;
2410
2411
        if (S3D_video_format_type == 0x03 ||
2412
            S3D_video_format_type == 0x04 ||
2413
            S3D_video_format_type == 0x08 ||
2414
            S3D_video_format_type == 0x23) {
2415
2416
            s1->has_stereo3d = 1;
2417
2418
            switch (S3D_video_format_type) {
2419
            case 0x03:
2420
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2421
                break;
2422
            case 0x04:
2423
                s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2424
                break;
2425
            case 0x08:
2426
                s1->stereo3d.type = AV_STEREO3D_2D;
2427
                break;
2428
            case 0x23:
2429
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2430
                break;
2431
            }
2432
        }
2433
525
    } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2434
482
        return;
2435
    }
2436
}
2437
2438
513
static void mpeg_decode_gop(AVCodecContext *avctx,
2439
                            const uint8_t *buf, int buf_size)
2440
{
2441
513
    Mpeg1Context *s1  = avctx->priv_data;
2442
513
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2443
    int broken_link;
2444
    int64_t tc;
2445
2446
513
    init_get_bits(&s->gb, buf, buf_size * 8);
2447
2448
513
    tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2449
2450
#if FF_API_PRIVATE_OPT
2451
FF_DISABLE_DEPRECATION_WARNINGS
2452
513
    avctx->timecode_frame_start = tc;
2453
FF_ENABLE_DEPRECATION_WARNINGS
2454
#endif
2455
2456
513
    s->closed_gop = get_bits1(&s->gb);
2457
    /* broken_link indicates that after editing the
2458
     * reference frames of the first B-Frames after GOP I-Frame
2459
     * are missing (open gop) */
2460
513
    broken_link = get_bits1(&s->gb);
2461
2462
513
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2463
        char tcbuf[AV_TIMECODE_STR_SIZE];
2464
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
2465
        av_log(s->avctx, AV_LOG_DEBUG,
2466
               "GOP (%s) closed_gop=%d broken_link=%d\n",
2467
               tcbuf, s->closed_gop, broken_link);
2468
    }
2469
513
}
2470
2471
4141
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2472
                         int *got_output, const uint8_t *buf, int buf_size)
2473
{
2474
4141
    Mpeg1Context *s = avctx->priv_data;
2475
4141
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2476
4141
    const uint8_t *buf_ptr = buf;
2477
4141
    const uint8_t *buf_end = buf + buf_size;
2478
    int ret, input_size;
2479
4141
    int last_code = 0, skip_frame = 0;
2480
4141
    int picture_start_code_seen = 0;
2481
2482
199014
    for (;;) {
2483
        /* find next start code */
2484
203155
        uint32_t start_code = -1;
2485
203155
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2486
203155
        if (start_code > 0x1ff) {
2487
4019
            if (!skip_frame) {
2488
3747
                if (HAVE_THREADS &&
2489
3747
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2490
475
                    !avctx->hwaccel) {
2491
                    int i;
2492
475
                    av_assert0(avctx->thread_count > 1);
2493
2494
475
                    avctx->execute(avctx, slice_decode_thread,
2495
475
                                   &s2->thread_context[0], NULL,
2496
                                   s->slice_count, sizeof(void *));
2497
4723
                    for (i = 0; i < s->slice_count; i++)
2498
4248
                        s2->er.error_count += s2->thread_context[i]->er.error_count;
2499
                }
2500
2501
3747
                ret = slice_end(avctx, picture);
2502
3747
                if (ret < 0)
2503
4141
                    return ret;
2504
3747
                else if (ret) {
2505
                    // FIXME: merge with the stuff in mpeg_decode_slice
2506

3487
                    if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2507
3428
                        *got_output = 1;
2508
                }
2509
            }
2510
4019
            s2->pict_type = 0;
2511
2512

4019
            if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2513
                return AVERROR_INVALIDDATA;
2514
2515
4019
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2516
        }
2517
2518
199136
        input_size = buf_end - buf_ptr;
2519
2520
199136
        if (avctx->debug & FF_DEBUG_STARTCODE)
2521
            av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2522
                   start_code, buf_ptr - buf, input_size);
2523
2524
        /* prepare data for next start code */
2525

199136
        switch (start_code) {
2526
741
        case SEQ_START_CODE:
2527
741
            if (last_code == 0) {
2528
741
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2529
741
                if (buf != avctx->extradata)
2530
504
                    s->sync = 1;
2531
            } else {
2532
                av_log(avctx, AV_LOG_ERROR,
2533
                       "ignoring SEQ_START_CODE after %X\n", last_code);
2534
                if (avctx->err_recognition & AV_EF_EXPLODE)
2535
                    return AVERROR_INVALIDDATA;
2536
            }
2537
741
            break;
2538
2539
4576
        case PICTURE_START_CODE:
2540

4576
            if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2541
               /* If it's a frame picture, there can't be more than one picture header.
2542
                  Yet, it does happen and we need to handle it. */
2543
               av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2544
               break;
2545
            }
2546
4576
            picture_start_code_seen = 1;
2547
2548

4576
            if (s2->width <= 0 || s2->height <= 0) {
2549
122
                av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2550
                       s2->width, s2->height);
2551
122
                return AVERROR_INVALIDDATA;
2552
            }
2553
2554
4454
            if (s->tmpgexs){
2555
                s2->intra_dc_precision= 3;
2556
                s2->intra_matrix[0]= 1;
2557
            }
2558
4454
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2559

478
                !avctx->hwaccel && s->slice_count) {
2560
                int i;
2561
2562
                avctx->execute(avctx, slice_decode_thread,
2563
                               s2->thread_context, NULL,
2564
                               s->slice_count, sizeof(void *));
2565
                for (i = 0; i < s->slice_count; i++)
2566
                    s2->er.error_count += s2->thread_context[i]->er.error_count;
2567
                s->slice_count = 0;
2568
            }
2569

4454
            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2570
4454
                ret = mpeg_decode_postinit(avctx);
2571
4454
                if (ret < 0) {
2572
                    av_log(avctx, AV_LOG_ERROR,
2573
                           "mpeg_decode_postinit() failure\n");
2574
                    return ret;
2575
                }
2576
2577
                /* We have a complete image: we try to decompress it. */
2578
4454
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2579
                    s2->pict_type = 0;
2580
4454
                s->first_slice = 1;
2581
4454
                last_code      = PICTURE_START_CODE;
2582
            } else {
2583
                av_log(avctx, AV_LOG_ERROR,
2584
                       "ignoring pic after %X\n", last_code);
2585
                if (avctx->err_recognition & AV_EF_EXPLODE)
2586
                    return AVERROR_INVALIDDATA;
2587
            }
2588
4454
            break;
2589
5377
        case EXT_START_CODE:
2590
5377
            init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2591
2592
5377
            switch (get_bits(&s2->gb, 4)) {
2593
649
            case 0x1:
2594
649
                if (last_code == 0) {
2595
649
                    mpeg_decode_sequence_extension(s);
2596
                } else {
2597
                    av_log(avctx, AV_LOG_ERROR,
2598
                           "ignoring seq ext after %X\n", last_code);
2599
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2600
                        return AVERROR_INVALIDDATA;
2601
                }
2602
649
                break;
2603
61
            case 0x2:
2604
61
                mpeg_decode_sequence_display_extension(s);
2605
61
                break;
2606
692
            case 0x3:
2607
692
                mpeg_decode_quant_matrix_extension(s2);
2608
692
                break;
2609
15
            case 0x7:
2610
15
                mpeg_decode_picture_display_extension(s);
2611
15
                break;
2612
3960
            case 0x8:
2613
3960
                if (last_code == PICTURE_START_CODE) {
2614
3960
                    mpeg_decode_picture_coding_extension(s);
2615
                } else {
2616
                    av_log(avctx, AV_LOG_ERROR,
2617
                           "ignoring pic cod ext after %X\n", last_code);
2618
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2619
                        return AVERROR_INVALIDDATA;
2620
                }
2621
3960
                break;
2622
            }
2623
5377
            break;
2624
732
        case USER_START_CODE:
2625
732
            mpeg_decode_user_data(avctx, buf_ptr, input_size);
2626
732
            break;
2627
513
        case GOP_START_CODE:
2628
513
            if (last_code == 0) {
2629
513
                s2->first_field = 0;
2630
513
                mpeg_decode_gop(avctx, buf_ptr, input_size);
2631
513
                s->sync = 1;
2632
            } else {
2633
                av_log(avctx, AV_LOG_ERROR,
2634
                       "ignoring GOP_START_CODE after %X\n", last_code);
2635
                if (avctx->err_recognition & AV_EF_EXPLODE)
2636
                    return AVERROR_INVALIDDATA;
2637
            }
2638
513
            break;
2639
187197
        default:
2640
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2641

186651
                start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2642

4454
                if (s2->progressive_sequence && !s2->progressive_frame) {
2643
                    s2->progressive_frame = 1;
2644
                    av_log(s2->avctx, AV_LOG_ERROR,
2645
                           "interlaced frame in progressive sequence, ignoring\n");
2646
                }
2647
2648
4454
                if (s2->picture_structure == 0 ||
2649

4454
                    (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2650
                    av_log(s2->avctx, AV_LOG_ERROR,
2651
                           "picture_structure %d invalid, ignoring\n",
2652
                           s2->picture_structure);
2653
                    s2->picture_structure = PICT_FRAME;
2654
                }
2655
2656

4454
                if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2657
                    av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2658
2659
4454
                if (s2->picture_structure == PICT_FRAME) {
2660
3064
                    s2->first_field = 0;
2661
3064
                    s2->v_edge_pos  = 16 * s2->mb_height;
2662
                } else {
2663
1390
                    s2->first_field ^= 1;
2664
1390
                    s2->v_edge_pos   = 8 * s2->mb_height;
2665
1390
                    memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2666
                }
2667
            }
2668
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2669

186651
                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2670
186507
                const int field_pic = s2->picture_structure != PICT_FRAME;
2671
186507
                int mb_y = start_code - SLICE_MIN_START_CODE;
2672
186507
                last_code = SLICE_MIN_START_CODE;
2673

186507
                if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2674
                    mb_y += (*buf_ptr&0xE0)<<2;
2675
2676
186507
                mb_y <<= field_pic;
2677
186507
                if (s2->picture_structure == PICT_BOTTOM_FIELD)
2678
10341
                    mb_y++;
2679
2680
186507
                if (buf_end - buf_ptr < 2) {
2681
                    av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2682
                    return AVERROR_INVALIDDATA;
2683
                }
2684
2685
186507
                if (mb_y >= s2->mb_height) {
2686
                    av_log(s2->avctx, AV_LOG_ERROR,
2687
                           "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2688
                    return AVERROR_INVALIDDATA;
2689
                }
2690
2691
186507
                if (!s2->last_picture_ptr) {
2692
                    /* Skip B-frames if we do not have reference frames and
2693
                     * GOP is not closed. */
2694
78806
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2695
612
                        if (!s2->closed_gop) {
2696
612
                            skip_frame = 1;
2697
612
                            av_log(s2->avctx, AV_LOG_DEBUG,
2698
                                   "Skipping B slice due to open GOP\n");
2699
612
                            break;
2700
                        }
2701
                    }
2702
                }
2703

185895
                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2704
120936
                    s->sync = 1;
2705
185895
                if (!s2->next_picture_ptr) {
2706
                    /* Skip P-frames if we do not have a reference frame or
2707
                     * we have an invalid header. */
2708

74630
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2709
3060
                        skip_frame = 1;
2710
3060
                        av_log(s2->avctx, AV_LOG_DEBUG,
2711
                               "Skipping P slice due to !sync\n");
2712
3060
                        break;
2713
                    }
2714
                }
2715
182835
                if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2716
71500
                     s2->pict_type == AV_PICTURE_TYPE_B) ||
2717
182835
                    (avctx->skip_frame >= AVDISCARD_NONKEY &&
2718
71500
                     s2->pict_type != AV_PICTURE_TYPE_I) ||
2719
182218
                    avctx->skip_frame >= AVDISCARD_ALL) {
2720
71500
                    skip_frame = 1;
2721
71500
                    break;
2722
                }
2723
2724
111335
                if (!s->mpeg_enc_ctx_allocated)
2725
                    break;
2726
2727
111335
                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2728
104062
                    if (mb_y < avctx->skip_top ||
2729
104062
                        mb_y >= s2->mb_height - avctx->skip_bottom)
2730
                        break;
2731
                }
2732
2733
111335
                if (!s2->pict_type) {
2734
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2735
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2736
                        return AVERROR_INVALIDDATA;
2737
                    break;
2738
                }
2739
2740
111335
                if (s->first_slice) {
2741
4089
                    skip_frame     = 0;
2742
4089
                    s->first_slice = 0;
2743
4089
                    if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2744
                        return ret;
2745
                }
2746
111335
                if (!s2->current_picture_ptr) {
2747
                    av_log(avctx, AV_LOG_ERROR,
2748
                           "current_picture not initialized\n");
2749
                    return AVERROR_INVALIDDATA;
2750
                }
2751
2752
111335
                if (HAVE_THREADS &&
2753
111335
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2754
14160
                    !avctx->hwaccel) {
2755
14160
                    int threshold = (s2->mb_height * s->slice_count +
2756
14160
                                     s2->slice_context_count / 2) /
2757
14160
                                    s2->slice_context_count;
2758
14160
                    av_assert0(avctx->thread_count > 1);
2759
14160
                    if (threshold <= mb_y) {
2760
4248
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2761
2762
4248
                        thread_context->start_mb_y = mb_y;
2763
4248
                        thread_context->end_mb_y   = s2->mb_height;
2764
4248
                        if (s->slice_count) {
2765
3776
                            s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2766
3776
                            ret = ff_update_duplicate_context(thread_context, s2);
2767
3776
                            if (ret < 0)
2768
                                return ret;
2769
                        }
2770
4248
                        init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2771
4248
                        s->slice_count++;
2772
                    }
2773
14160
                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
2774
                } else {
2775
97175
                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2776
97175
                    emms_c();
2777
2778
97175
                    if (ret < 0) {
2779
4
                        if (avctx->err_recognition & AV_EF_EXPLODE)
2780
                            return ret;
2781

4
                        if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2782
4
                            ff_er_add_slice(&s2->er, s2->resync_mb_x,
2783
                                            s2->resync_mb_y, s2->mb_x, s2->mb_y,
2784
                                            ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2785
                    } else {
2786
97171
                        ff_er_add_slice(&s2->er, s2->resync_mb_x,
2787
97171
                                        s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2788
                                        ER_AC_END | ER_DC_END | ER_MV_END);
2789
                    }
2790
                }
2791
            }
2792
112025
            break;
2793
        }
2794
    }
2795
}
2796
2797
4058
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2798
                             int *got_output, AVPacket *avpkt)
2799
{
2800
4058
    const uint8_t *buf = avpkt->data;
2801
    int ret;
2802
4058
    int buf_size = avpkt->size;
2803
4058
    Mpeg1Context *s = avctx->priv_data;
2804
4058
    AVFrame *picture = data;
2805
4058
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2806
2807

4058
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2808
        /* special case for last picture */
2809

129
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
2810
59
            int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2811
59
            if (ret < 0)
2812
                return ret;
2813
2814
59
            s2->next_picture_ptr = NULL;
2815
2816
59
            *got_output = 1;
2817
        }
2818
129
        return buf_size;
2819
    }
2820
2821
3929
    if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2822
49
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2823
                                           buf_size, NULL);
2824
2825
49
        if (ff_combine_frame(&s2->parse_context, next,
2826
                             (const uint8_t **) &buf, &buf_size) < 0)
2827
25
            return buf_size;
2828
    }
2829
2830
3904
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2831

3904
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2832
381
                                           || s2->codec_tag == AV_RL32("BW10")
2833
                                          ))
2834
2
        vcr2_init_sequence(avctx);
2835
2836
3904
    s->slice_count = 0;
2837
2838

3904
    if (avctx->extradata && !s->extradata_decoded) {
2839
237
        ret = decode_chunks(avctx, picture, got_output,
2840
237
                            avctx->extradata, avctx->extradata_size);
2841
237
        if (*got_output) {
2842
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2843
            av_frame_unref(picture);
2844
            *got_output = 0;
2845
        }
2846
237
        s->extradata_decoded = 1;
2847

237
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2848
            s2->current_picture_ptr = NULL;
2849
            return ret;
2850
        }
2851
    }
2852
2853
3904
    ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2854

3904
    if (ret<0 || *got_output) {
2855
3550
        s2->current_picture_ptr = NULL;
2856
2857

3550
        if (s2->timecode_frame_start != -1 && *got_output) {
2858
            char tcbuf[AV_TIMECODE_STR_SIZE];
2859
343
            AVFrameSideData *tcside = av_frame_new_side_data(picture,
2860
                                                             AV_FRAME_DATA_GOP_TIMECODE,
2861
                                                             sizeof(int64_t));
2862
343
            if (!tcside)
2863
                return AVERROR(ENOMEM);
2864
343
            memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2865
2866
343
            av_timecode_make_mpeg_tc_string(tcbuf, s2->timecode_frame_start);
2867
343
            av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2868
2869
343
            s2->timecode_frame_start = -1;
2870
        }
2871
    }
2872
2873
3904
    return ret;
2874
}
2875
2876
static void flush(AVCodecContext *avctx)
2877
{
2878
    Mpeg1Context *s = avctx->priv_data;
2879
2880
    s->sync       = 0;
2881
2882
    ff_mpeg_flush(avctx);
2883
}
2884
2885
255
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2886
{
2887
255
    Mpeg1Context *s = avctx->priv_data;
2888
2889
255
    ff_mpv_common_end(&s->mpeg_enc_ctx);
2890
255
    av_buffer_unref(&s->a53_buf_ref);
2891
255
    return 0;
2892
}
2893
2894
AVCodec ff_mpeg1video_decoder = {
2895
    .name                  = "mpeg1video",
2896
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2897
    .type                  = AVMEDIA_TYPE_VIDEO,
2898
    .id                    = AV_CODEC_ID_MPEG1VIDEO,
2899
    .priv_data_size        = sizeof(Mpeg1Context),
2900
    .init                  = mpeg_decode_init,
2901
    .close                 = mpeg_decode_end,
2902
    .decode                = mpeg_decode_frame,
2903
    .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2904
                             AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2905
                             AV_CODEC_CAP_SLICE_THREADS,
2906
    .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2907
    .flush                 = flush,
2908
    .max_lowres            = 3,
2909
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2910
    .hw_configs            = (const AVCodecHWConfigInternal*[]) {
2911
#if CONFIG_MPEG1_NVDEC_HWACCEL
2912
                               HWACCEL_NVDEC(mpeg1),
2913
#endif
2914
#if CONFIG_MPEG1_VDPAU_HWACCEL
2915
                               HWACCEL_VDPAU(mpeg1),
2916
#endif
2917
#if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2918
                               HWACCEL_VIDEOTOOLBOX(mpeg1),
2919
#endif
2920
#if CONFIG_MPEG1_XVMC_HWACCEL
2921
                               HWACCEL_XVMC(mpeg1),
2922
#endif
2923
                               NULL
2924
                           },
2925
};
2926
2927
AVCodec ff_mpeg2video_decoder = {
2928
    .name           = "mpeg2video",
2929
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2930
    .type           = AVMEDIA_TYPE_VIDEO,
2931
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2932
    .priv_data_size = sizeof(Mpeg1Context),
2933
    .init           = mpeg_decode_init,
2934
    .close          = mpeg_decode_end,
2935
    .decode         = mpeg_decode_frame,
2936
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2937
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2938
                      AV_CODEC_CAP_SLICE_THREADS,
2939
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2940
    .flush          = flush,
2941
    .max_lowres     = 3,
2942
    .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2943
    .hw_configs     = (const AVCodecHWConfigInternal*[]) {
2944
#if CONFIG_MPEG2_DXVA2_HWACCEL
2945
                        HWACCEL_DXVA2(mpeg2),
2946
#endif
2947
#if CONFIG_MPEG2_D3D11VA_HWACCEL
2948
                        HWACCEL_D3D11VA(mpeg2),
2949
#endif
2950
#if CONFIG_MPEG2_D3D11VA2_HWACCEL
2951
                        HWACCEL_D3D11VA2(mpeg2),
2952
#endif
2953
#if CONFIG_MPEG2_NVDEC_HWACCEL
2954
                        HWACCEL_NVDEC(mpeg2),
2955
#endif
2956
#if CONFIG_MPEG2_VAAPI_HWACCEL
2957
                        HWACCEL_VAAPI(mpeg2),
2958
#endif
2959
#if CONFIG_MPEG2_VDPAU_HWACCEL
2960
                        HWACCEL_VDPAU(mpeg2),
2961
#endif
2962
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2963
                        HWACCEL_VIDEOTOOLBOX(mpeg2),
2964
#endif
2965
#if CONFIG_MPEG2_XVMC_HWACCEL
2966
                        HWACCEL_XVMC(mpeg2),
2967
#endif
2968
                        NULL
2969
                    },
2970
};
2971
2972
//legacy decoder
2973
AVCodec ff_mpegvideo_decoder = {
2974
    .name           = "mpegvideo",
2975
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2976
    .type           = AVMEDIA_TYPE_VIDEO,
2977
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2978
    .priv_data_size = sizeof(Mpeg1Context),
2979
    .init           = mpeg_decode_init,
2980
    .close          = mpeg_decode_end,
2981
    .decode         = mpeg_decode_frame,
2982
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2983
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2984
    .flush          = flush,
2985
    .max_lowres     = 3,
2986
};