GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpeg12dec.c Lines: 1175 1760 66.8 %
Date: 2020-11-28 20:53:16 Branches: 643 1143 56.3 %

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
#define A53_MAX_CC_COUNT 2000
54
55
typedef struct Mpeg1Context {
56
    MpegEncContext mpeg_enc_ctx;
57
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
58
    int repeat_field;           /* true if we must repeat the field */
59
    AVPanScan pan_scan;         /* some temporary storage for the panscan */
60
    AVStereo3D stereo3d;
61
    int has_stereo3d;
62
    AVBufferRef *a53_buf_ref;
63
    uint8_t afd;
64
    int has_afd;
65
    int slice_count;
66
    AVRational save_aspect;
67
    int save_width, save_height, save_progressive_seq;
68
    int rc_buffer_size;
69
    AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
70
    int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
71
    int tmpgexs;
72
    int first_slice;
73
    int extradata_decoded;
74
} Mpeg1Context;
75
76
#define MB_TYPE_ZERO_MV   0x20000000
77
78
static const uint32_t ptype2mb_type[7] = {
79
                    MB_TYPE_INTRA,
80
                    MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
81
                    MB_TYPE_L0,
82
                    MB_TYPE_L0 | MB_TYPE_CBP,
83
    MB_TYPE_QUANT | MB_TYPE_INTRA,
84
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
85
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
86
};
87
88
static const uint32_t btype2mb_type[11] = {
89
                    MB_TYPE_INTRA,
90
                    MB_TYPE_L1,
91
                    MB_TYPE_L1   | MB_TYPE_CBP,
92
                    MB_TYPE_L0,
93
                    MB_TYPE_L0   | MB_TYPE_CBP,
94
                    MB_TYPE_L0L1,
95
                    MB_TYPE_L0L1 | MB_TYPE_CBP,
96
    MB_TYPE_QUANT | MB_TYPE_INTRA,
97
    MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
98
    MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
99
    MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
100
};
101
102
/* as H.263, but only 17 codes */
103
4129656
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
104
{
105
    int code, sign, val, shift;
106
107
4129656
    code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
108
4129656
    if (code == 0)
109
1684185
        return pred;
110
2445471
    if (code < 0)
111
        return 0xffff;
112
113
2445471
    sign  = get_bits1(&s->gb);
114
2445471
    shift = fcode - 1;
115
2445471
    val   = code;
116
2445471
    if (shift) {
117
2103529
        val  = (val - 1) << shift;
118
2103529
        val |= get_bits(&s->gb, shift);
119
2103529
        val++;
120
    }
121
2445471
    if (sign)
122
1265834
        val = -val;
123
2445471
    val += pred;
124
125
    /* modulo decoding */
126
2445471
    return sign_extend(val, 5 + shift);
127
}
128
129
#define MAX_INDEX (64 - 1)
130
#define check_scantable_index(ctx, x)                                         \
131
    do {                                                                      \
132
        if ((x) > MAX_INDEX) {                                                \
133
            av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
134
                   ctx->mb_x, ctx->mb_y);                                     \
135
            return AVERROR_INVALIDDATA;                                       \
136
        }                                                                     \
137
    } while (0)
138
139
403118
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
140
                                           int16_t *block, int n)
141
{
142
    int level, i, j, run;
143
403118
    RLTable *rl                  = &ff_rl_mpeg1;
144
403118
    uint8_t *const scantable     = s->intra_scantable.permutated;
145
403118
    const uint16_t *quant_matrix = s->inter_matrix;
146
403118
    const int qscale             = s->qscale;
147
148
    {
149
403118
        OPEN_READER(re, &s->gb);
150
403118
        i = -1;
151
        // special case for first coefficient, no need to add second VLC table
152
403118
        UPDATE_CACHE(re, &s->gb);
153
403118
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
154
101724
            level = (3 * qscale * quant_matrix[0]) >> 5;
155
101724
            level = (level - 1) | 1;
156
101724
            if (GET_CACHE(re, &s->gb) & 0x40000000)
157
56898
                level = -level;
158
101724
            block[0] = level;
159
101724
            i++;
160
101724
            SKIP_BITS(re, &s->gb, 2);
161
101724
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
162
34285
                goto end;
163
        }
164
        /* now quantify & encode AC coefficients */
165
        for (;;) {
166
2921408
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
167
                       TEX_VLC_BITS, 2, 0);
168
169
2921408
            if (level != 0) {
170
2842322
                i += run;
171
2842322
                if (i > MAX_INDEX)
172
                    break;
173
2842322
                j = scantable[i];
174
2842322
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
175
2842322
                level = (level - 1) | 1;
176
2842322
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
177
2842322
                        SHOW_SBITS(re, &s->gb, 1);
178
2842322
                SKIP_BITS(re, &s->gb, 1);
179
            } else {
180
                /* escape */
181
79086
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
182
79086
                LAST_SKIP_BITS(re, &s->gb, 6);
183
79086
                UPDATE_CACHE(re, &s->gb);
184
79086
                level = SHOW_SBITS(re, &s->gb, 8);
185
79086
                SKIP_BITS(re, &s->gb, 8);
186
79086
                if (level == -128) {
187
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
188
                    SKIP_BITS(re, &s->gb, 8);
189
79086
                } else if (level == 0) {
190
                    level = SHOW_UBITS(re, &s->gb, 8);
191
                    SKIP_BITS(re, &s->gb, 8);
192
                }
193
79086
                i += run;
194
79086
                if (i > MAX_INDEX)
195
                    break;
196
79086
                j = scantable[i];
197
79086
                if (level < 0) {
198
38919
                    level = -level;
199
38919
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
200
38919
                    level = (level - 1) | 1;
201
38919
                    level = -level;
202
                } else {
203
40167
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
204
40167
                    level = (level - 1) | 1;
205
                }
206
            }
207
208
2921408
            block[j] = level;
209
2921408
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
210
368833
                break;
211
2552575
            UPDATE_CACHE(re, &s->gb);
212
        }
213
403118
end:
214
403118
        LAST_SKIP_BITS(re, &s->gb, 2);
215
403118
        CLOSE_READER(re, &s->gb);
216
    }
217
218
403118
    check_scantable_index(s, i);
219
220
403118
    s->block_last_index[n] = i;
221
403118
    return 0;
222
}
223
224
/**
225
 * Changing this would eat up any speed benefits it has.
226
 * Do not use "fast" flag if you need the code to be robust.
227
 */
228
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
229
                                                int16_t *block, int n)
230
{
231
    int level, i, j, run;
232
    RLTable *rl              = &ff_rl_mpeg1;
233
    uint8_t *const scantable = s->intra_scantable.permutated;
234
    const int qscale         = s->qscale;
235
236
    {
237
        OPEN_READER(re, &s->gb);
238
        i = -1;
239
        // Special case for first coefficient, no need to add second VLC table.
240
        UPDATE_CACHE(re, &s->gb);
241
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
242
            level = (3 * qscale) >> 1;
243
            level = (level - 1) | 1;
244
            if (GET_CACHE(re, &s->gb) & 0x40000000)
245
                level = -level;
246
            block[0] = level;
247
            i++;
248
            SKIP_BITS(re, &s->gb, 2);
249
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
250
                goto end;
251
        }
252
253
        /* now quantify & encode AC coefficients */
254
        for (;;) {
255
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
256
                       TEX_VLC_BITS, 2, 0);
257
258
            if (level != 0) {
259
                i += run;
260
                if (i > MAX_INDEX)
261
                    break;
262
                j = scantable[i];
263
                level = ((level * 2 + 1) * qscale) >> 1;
264
                level = (level - 1) | 1;
265
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
266
                        SHOW_SBITS(re, &s->gb, 1);
267
                SKIP_BITS(re, &s->gb, 1);
268
            } else {
269
                /* escape */
270
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
271
                LAST_SKIP_BITS(re, &s->gb, 6);
272
                UPDATE_CACHE(re, &s->gb);
273
                level = SHOW_SBITS(re, &s->gb, 8);
274
                SKIP_BITS(re, &s->gb, 8);
275
                if (level == -128) {
276
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
277
                    SKIP_BITS(re, &s->gb, 8);
278
                } else if (level == 0) {
279
                    level = SHOW_UBITS(re, &s->gb, 8);
280
                    SKIP_BITS(re, &s->gb, 8);
281
                }
282
                i += run;
283
                if (i > MAX_INDEX)
284
                    break;
285
                j = scantable[i];
286
                if (level < 0) {
287
                    level = -level;
288
                    level = ((level * 2 + 1) * qscale) >> 1;
289
                    level = (level - 1) | 1;
290
                    level = -level;
291
                } else {
292
                    level = ((level * 2 + 1) * qscale) >> 1;
293
                    level = (level - 1) | 1;
294
                }
295
            }
296
297
            block[j] = level;
298
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
299
                break;
300
            UPDATE_CACHE(re, &s->gb);
301
        }
302
end:
303
        LAST_SKIP_BITS(re, &s->gb, 2);
304
        CLOSE_READER(re, &s->gb);
305
    }
306
307
    check_scantable_index(s, i);
308
309
    s->block_last_index[n] = i;
310
    return 0;
311
}
312
313
3807658
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
314
                                               int16_t *block, int n)
315
{
316
    int level, i, j, run;
317
3807658
    RLTable *rl = &ff_rl_mpeg1;
318
3807658
    uint8_t *const scantable = s->intra_scantable.permutated;
319
    const uint16_t *quant_matrix;
320
3807658
    const int qscale = s->qscale;
321
    int mismatch;
322
323
3807658
    mismatch = 1;
324
325
    {
326
3807658
        OPEN_READER(re, &s->gb);
327
3807658
        i = -1;
328
3807658
        if (n < 4)
329
2868315
            quant_matrix = s->inter_matrix;
330
        else
331
939343
            quant_matrix = s->chroma_inter_matrix;
332
333
        // Special case for first coefficient, no need to add second VLC table.
334
3807658
        UPDATE_CACHE(re, &s->gb);
335
3807658
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
336
1330950
            level = (3 * qscale * quant_matrix[0]) >> 5;
337
1330950
            if (GET_CACHE(re, &s->gb) & 0x40000000)
338
834321
                level = -level;
339
1330950
            block[0]  = level;
340
1330950
            mismatch ^= level;
341
1330950
            i++;
342
1330950
            SKIP_BITS(re, &s->gb, 2);
343
1330950
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
344
604081
                goto end;
345
        }
346
347
        /* now quantify & encode AC coefficients */
348
        for (;;) {
349
15255123
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
350
                       TEX_VLC_BITS, 2, 0);
351
352
15255123
            if (level != 0) {
353
15003427
                i += run;
354
15003427
                if (i > MAX_INDEX)
355
                    break;
356
15003427
                j = scantable[i];
357
15003427
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
358
15003427
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
359
15003427
                        SHOW_SBITS(re, &s->gb, 1);
360
15003427
                SKIP_BITS(re, &s->gb, 1);
361
            } else {
362
                /* escape */
363
251696
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
364
251696
                LAST_SKIP_BITS(re, &s->gb, 6);
365
251696
                UPDATE_CACHE(re, &s->gb);
366
251696
                level = SHOW_SBITS(re, &s->gb, 12);
367
251696
                SKIP_BITS(re, &s->gb, 12);
368
369
251696
                i += run;
370
251696
                if (i > MAX_INDEX)
371
                    break;
372
251696
                j = scantable[i];
373
251696
                if (level < 0) {
374
122825
                    level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
375
122825
                    level = -level;
376
                } else {
377
128871
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
378
                }
379
            }
380
381
15255123
            mismatch ^= level;
382
15255123
            block[j]  = level;
383
15255123
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
384
3203577
                break;
385
12051546
            UPDATE_CACHE(re, &s->gb);
386
        }
387
3807658
end:
388
3807658
        LAST_SKIP_BITS(re, &s->gb, 2);
389
3807658
        CLOSE_READER(re, &s->gb);
390
    }
391
3807658
    block[63] ^= (mismatch & 1);
392
393
3807658
    check_scantable_index(s, i);
394
395
3807658
    s->block_last_index[n] = i;
396
3807658
    return 0;
397
}
398
399
/**
400
 * Changing this would eat up any speed benefits it has.
401
 * Do not use "fast" flag if you need the code to be robust.
402
 */
403
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
404
                                                    int16_t *block, int n)
405
{
406
    int level, i, j, run;
407
    RLTable *rl              = &ff_rl_mpeg1;
408
    uint8_t *const scantable = s->intra_scantable.permutated;
409
    const int qscale         = s->qscale;
410
    OPEN_READER(re, &s->gb);
411
    i = -1;
412
413
    // special case for first coefficient, no need to add second VLC table
414
    UPDATE_CACHE(re, &s->gb);
415
    if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
416
        level = (3 * qscale) >> 1;
417
        if (GET_CACHE(re, &s->gb) & 0x40000000)
418
            level = -level;
419
        block[0] = level;
420
        i++;
421
        SKIP_BITS(re, &s->gb, 2);
422
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
423
            goto end;
424
    }
425
426
    /* now quantify & encode AC coefficients */
427
    for (;;) {
428
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
429
430
        if (level != 0) {
431
            i += run;
432
            if (i > MAX_INDEX)
433
                break;
434
            j = scantable[i];
435
            level = ((level * 2 + 1) * qscale) >> 1;
436
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
437
                    SHOW_SBITS(re, &s->gb, 1);
438
            SKIP_BITS(re, &s->gb, 1);
439
        } else {
440
            /* escape */
441
            run = SHOW_UBITS(re, &s->gb, 6) + 1;
442
            LAST_SKIP_BITS(re, &s->gb, 6);
443
            UPDATE_CACHE(re, &s->gb);
444
            level = SHOW_SBITS(re, &s->gb, 12);
445
            SKIP_BITS(re, &s->gb, 12);
446
447
            i += run;
448
            if (i > MAX_INDEX)
449
                break;
450
            j = scantable[i];
451
            if (level < 0) {
452
                level = ((-level * 2 + 1) * qscale) >> 1;
453
                level = -level;
454
            } else {
455
                level = ((level * 2 + 1) * qscale) >> 1;
456
            }
457
        }
458
459
        block[j] = level;
460
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
461
            break;
462
463
        UPDATE_CACHE(re, &s->gb);
464
    }
465
end:
466
    LAST_SKIP_BITS(re, &s->gb, 2);
467
    CLOSE_READER(re, &s->gb);
468
469
    check_scantable_index(s, i);
470
471
    s->block_last_index[n] = i;
472
    return 0;
473
}
474
475
1624926
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
476
                                           int16_t *block, int n)
477
{
478
    int level, dc, diff, i, j, run;
479
    int component;
480
    RLTable *rl;
481
1624926
    uint8_t *const scantable = s->intra_scantable.permutated;
482
    const uint16_t *quant_matrix;
483
1624926
    const int qscale = s->qscale;
484
    int mismatch;
485
486
    /* DC coefficient */
487
1624926
    if (n < 4) {
488
1011540
        quant_matrix = s->intra_matrix;
489
1011540
        component    = 0;
490
    } else {
491
613386
        quant_matrix = s->chroma_intra_matrix;
492
613386
        component    = (n & 1) + 1;
493
    }
494
1624926
    diff = decode_dc(&s->gb, component);
495
1624926
    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
                SKIP_BITS(re, &s->gb, 6);
530
122266
                level = SHOW_SBITS(re, &s->gb, 12);
531
122266
                LAST_SKIP_BITS(re, &s->gb, 12);
532
122266
                i += run;
533
122266
                if (i > MAX_INDEX)
534
                    break;
535
122266
                j = scantable[i];
536
122266
                if (level < 0) {
537
53361
                    level = (-level * qscale * quant_matrix[j]) >> 4;
538
53361
                    level = -level;
539
                } else {
540
68905
                    level = (level * qscale * quant_matrix[j]) >> 4;
541
                }
542
            }
543
544
11150162
            mismatch ^= level;
545
11150162
            block[j]  = level;
546
        }
547
1624926
        CLOSE_READER(re, &s->gb);
548
    }
549
1624926
    block[63] ^= mismatch & 1;
550
551
1624926
    check_scantable_index(s, i);
552
553
1624922
    s->block_last_index[n] = i;
554
1624922
    return 0;
555
}
556
557
/**
558
 * Changing this would eat up any speed benefits it has.
559
 * Do not use "fast" flag if you need the code to be robust.
560
 */
561
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
562
                                                int16_t *block, int n)
563
{
564
    int level, dc, diff, i, j, run;
565
    int component;
566
    RLTable *rl;
567
    uint8_t *const scantable = s->intra_scantable.permutated;
568
    const uint16_t *quant_matrix;
569
    const int qscale = s->qscale;
570
571
    /* DC coefficient */
572
    if (n < 4) {
573
        quant_matrix = s->intra_matrix;
574
        component    = 0;
575
    } else {
576
        quant_matrix = s->chroma_intra_matrix;
577
        component    = (n & 1) + 1;
578
    }
579
    diff = decode_dc(&s->gb, component);
580
    dc = s->last_dc[component];
581
    dc += diff;
582
    s->last_dc[component] = dc;
583
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
584
    i = 0;
585
    if (s->intra_vlc_format)
586
        rl = &ff_rl_mpeg2;
587
    else
588
        rl = &ff_rl_mpeg1;
589
590
    {
591
        OPEN_READER(re, &s->gb);
592
        /* now quantify & encode AC coefficients */
593
        for (;;) {
594
            UPDATE_CACHE(re, &s->gb);
595
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
596
                       TEX_VLC_BITS, 2, 0);
597
598
            if (level >= 64 || i > 63) {
599
                break;
600
            } else if (level != 0) {
601
                i += run;
602
                j = scantable[i];
603
                level = (level * qscale * quant_matrix[j]) >> 4;
604
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
605
                        SHOW_SBITS(re, &s->gb, 1);
606
                LAST_SKIP_BITS(re, &s->gb, 1);
607
            } else {
608
                /* escape */
609
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
610
                SKIP_BITS(re, &s->gb, 6);
611
                level = SHOW_SBITS(re, &s->gb, 12);
612
                LAST_SKIP_BITS(re, &s->gb, 12);
613
                i += run;
614
                j = scantable[i];
615
                if (level < 0) {
616
                    level = (-level * qscale * quant_matrix[j]) >> 4;
617
                    level = -level;
618
                } else {
619
                    level = (level * qscale * quant_matrix[j]) >> 4;
620
                }
621
            }
622
623
            block[j] = level;
624
        }
625
        CLOSE_READER(re, &s->gb);
626
    }
627
628
    check_scantable_index(s, i);
629
630
    s->block_last_index[n] = i;
631
    return 0;
632
}
633
634
/******************************************/
635
/* decoding */
636
637
30328
static inline int get_dmv(MpegEncContext *s)
638
{
639
30328
    if (get_bits1(&s->gb))
640
28315
        return 1 - (get_bits1(&s->gb) << 1);
641
    else
642
2013
        return 0;
643
}
644
645
/* motion type (for MPEG-2) */
646
#define MT_FIELD 1
647
#define MT_FRAME 2
648
#define MT_16X8  2
649
#define MT_DMV   3
650
651
2059378
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
652
{
653
    int i, j, k, cbp, val, mb_type, motion_type;
654
2059378
    const int mb_block_count = 4 + (1 << s->chroma_format);
655
    int ret;
656
657
    ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
658
659
    av_assert2(s->mb_skipped == 0);
660
661
2059378
    if (s->mb_skip_run-- != 0) {
662
154709
        if (s->pict_type == AV_PICTURE_TYPE_P) {
663
51652
            s->mb_skipped = 1;
664
51652
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
665
                MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
666
        } else {
667
            int mb_type;
668
669
103057
            if (s->mb_x)
670
103057
                mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
671
            else
672
                // FIXME not sure if this is allowed in MPEG at all
673
                mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
674
103057
            if (IS_INTRA(mb_type)) {
675
                av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
676
                return AVERROR_INVALIDDATA;
677
            }
678
103057
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
679
103057
                mb_type | MB_TYPE_SKIP;
680
681
103057
            if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
682
73394
                s->mb_skipped = 1;
683
        }
684
685
154709
        return 0;
686
    }
687
688
1904669
    switch (s->pict_type) {
689
204195
    default:
690
    case AV_PICTURE_TYPE_I:
691
204195
        if (get_bits1(&s->gb) == 0) {
692
16344
            if (get_bits1(&s->gb) == 0) {
693
                av_log(s->avctx, AV_LOG_ERROR,
694
                       "Invalid mb type in I-frame at %d %d\n",
695
                       s->mb_x, s->mb_y);
696
                return AVERROR_INVALIDDATA;
697
            }
698
16344
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
699
        } else {
700
187851
            mb_type = MB_TYPE_INTRA;
701
        }
702
204195
        break;
703
1069428
    case AV_PICTURE_TYPE_P:
704
1069428
        mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
705
1069428
        if (mb_type < 0) {
706
            av_log(s->avctx, AV_LOG_ERROR,
707
                   "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
708
            return AVERROR_INVALIDDATA;
709
        }
710
1069428
        mb_type = ptype2mb_type[mb_type];
711
1069428
        break;
712
631046
    case AV_PICTURE_TYPE_B:
713
631046
        mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
714
631046
        if (mb_type < 0) {
715
            av_log(s->avctx, AV_LOG_ERROR,
716
                   "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
717
            return AVERROR_INVALIDDATA;
718
        }
719
631046
        mb_type = btype2mb_type[mb_type];
720
631046
        break;
721
    }
722
    ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
723
//    motion_type = 0; /* avoid warning */
724
1904669
    if (IS_INTRA(mb_type)) {
725
273908
        s->bdsp.clear_blocks(s->block[0]);
726
727
273908
        if (!s->chroma_y_shift)
728
53810
            s->bdsp.clear_blocks(s->block[6]);
729
730
        /* compute DCT type */
731
        // FIXME: add an interlaced_dct coded var?
732
273908
        if (s->picture_structure == PICT_FRAME &&
733
230337
            !s->frame_pred_frame_dct)
734
96158
            s->interlaced_dct = get_bits1(&s->gb);
735
736
273908
        if (IS_QUANT(mb_type))
737
22653
            s->qscale = mpeg_get_qscale(s);
738
739
273908
        if (s->concealment_motion_vectors) {
740
            /* just parse them */
741
678
            if (s->picture_structure != PICT_FRAME)
742
675
                skip_bits1(&s->gb);  /* field select */
743
744
678
            s->mv[0][0][0]      =
745
678
            s->last_mv[0][0][0] =
746
678
            s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
747
                                                     s->last_mv[0][0][0]);
748
678
            s->mv[0][0][1]      =
749
678
            s->last_mv[0][0][1] =
750
678
            s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
751
                                                     s->last_mv[0][0][1]);
752
753
678
            check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
754
        } else {
755
            /* reset mv prediction */
756
273230
            memset(s->last_mv, 0, sizeof(s->last_mv));
757
        }
758
273908
        s->mb_intra = 1;
759
        // if 1, we memcpy blocks in xvmcvideo
760
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
761
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
762
763
273908
        if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
764
252887
            if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
765
                for (i = 0; i < 6; i++)
766
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
767
            } else {
768
1877809
                for (i = 0; i < mb_block_count; i++)
769
1624926
                    if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
770
4
                        return ret;
771
            }
772
        } else {
773
147147
            for (i = 0; i < 6; i++) {
774
126126
                ret = ff_mpeg1_decode_block_intra(&s->gb,
775
126126
                                                  s->intra_matrix,
776
126126
                                                  s->intra_scantable.permutated,
777
126126
                                                  s->last_dc, *s->pblocks[i],
778
                                                  i, s->qscale);
779
126126
                if (ret < 0) {
780
                    av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
781
                           s->mb_x, s->mb_y);
782
                    return ret;
783
                }
784
785
126126
                s->block_last_index[i] = ret;
786
            }
787
        }
788
    } else {
789
1630761
        if (mb_type & MB_TYPE_ZERO_MV) {
790
            av_assert2(mb_type & MB_TYPE_CBP);
791
792
154462
            s->mv_dir = MV_DIR_FORWARD;
793
154462
            if (s->picture_structure == PICT_FRAME) {
794
64497
                if (s->picture_structure == PICT_FRAME
795
64497
                    && !s->frame_pred_frame_dct)
796
39580
                    s->interlaced_dct = get_bits1(&s->gb);
797
64497
                s->mv_type = MV_TYPE_16X16;
798
            } else {
799
89965
                s->mv_type            = MV_TYPE_FIELD;
800
89965
                mb_type              |= MB_TYPE_INTERLACED;
801
89965
                s->field_select[0][0] = s->picture_structure - 1;
802
            }
803
804
154462
            if (IS_QUANT(mb_type))
805
38251
                s->qscale = mpeg_get_qscale(s);
806
807
154462
            s->last_mv[0][0][0] = 0;
808
154462
            s->last_mv[0][0][1] = 0;
809
154462
            s->last_mv[0][1][0] = 0;
810
154462
            s->last_mv[0][1][1] = 0;
811
154462
            s->mv[0][0][0]      = 0;
812
154462
            s->mv[0][0][1]      = 0;
813
        } else {
814
            av_assert2(mb_type & MB_TYPE_L0L1);
815
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
816
            /* get additional motion vector type */
817

1476299
            if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
818
603374
                motion_type = MT_FRAME;
819
            } else {
820
872925
                motion_type = get_bits(&s->gb, 2);
821

872925
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
822
357276
                    s->interlaced_dct = get_bits1(&s->gb);
823
            }
824
825
1476299
            if (IS_QUANT(mb_type))
826
135734
                s->qscale = mpeg_get_qscale(s);
827
828
            /* motion vectors */
829
1476299
            s->mv_dir = (mb_type >> 13) & 3;
830
            ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
831

1476299
            switch (motion_type) {
832
1236664
            case MT_FRAME: /* or MT_16X8 */
833
1236664
                if (s->picture_structure == PICT_FRAME) {
834
1034164
                    mb_type   |= MB_TYPE_16x16;
835
1034164
                    s->mv_type = MV_TYPE_16X16;
836
3102492
                    for (i = 0; i < 2; i++) {
837
2068328
                        if (USES_LIST(mb_type, i)) {
838
                            /* MT_FRAME */
839
1323224
                            s->mv[i][0][0]      =
840
1323224
                            s->last_mv[i][0][0] =
841
1323224
                            s->last_mv[i][1][0] =
842
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0],
843
                                                   s->last_mv[i][0][0]);
844
1323224
                            s->mv[i][0][1]      =
845
1323224
                            s->last_mv[i][0][1] =
846
1323224
                            s->last_mv[i][1][1] =
847
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1],
848
                                                   s->last_mv[i][0][1]);
849
                            /* full_pel: only for MPEG-1 */
850
1323224
                            if (s->full_pel[i]) {
851
                                s->mv[i][0][0] *= 2;
852
                                s->mv[i][0][1] *= 2;
853
                            }
854
                        }
855
                    }
856
                } else {
857
202500
                    mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
858
202500
                    s->mv_type = MV_TYPE_16X8;
859
607500
                    for (i = 0; i < 2; i++) {
860
405000
                        if (USES_LIST(mb_type, i)) {
861
                            /* MT_16X8 */
862
609543
                            for (j = 0; j < 2; j++) {
863
406362
                                s->field_select[i][j] = get_bits1(&s->gb);
864
1219086
                                for (k = 0; k < 2; k++) {
865
812724
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
866
                                                             s->last_mv[i][j][k]);
867
812724
                                    s->last_mv[i][j][k] = val;
868
812724
                                    s->mv[i][j][k]      = val;
869
                                }
870
                            }
871
                        }
872
                    }
873
                }
874
1236664
                break;
875
224471
            case MT_FIELD:
876
224471
                s->mv_type = MV_TYPE_FIELD;
877
224471
                if (s->picture_structure == PICT_FRAME) {
878
63707
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
879
191121
                    for (i = 0; i < 2; i++) {
880
127414
                        if (USES_LIST(mb_type, i)) {
881
230964
                            for (j = 0; j < 2; j++) {
882
153976
                                s->field_select[i][j] = get_bits1(&s->gb);
883
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
884
                                                         s->last_mv[i][j][0]);
885
153976
                                s->last_mv[i][j][0] = val;
886
153976
                                s->mv[i][j][0]      = val;
887
                                ff_tlog(s->avctx, "fmx=%d\n", val);
888
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
889
153976
                                                         s->last_mv[i][j][1] >> 1);
890
153976
                                s->last_mv[i][j][1] = 2 * val;
891
153976
                                s->mv[i][j][1]      = val;
892
                                ff_tlog(s->avctx, "fmy=%d\n", val);
893
                            }
894
                        }
895
                    }
896
                } else {
897
160764
                    av_assert0(!s->progressive_sequence);
898
160764
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
899
482292
                    for (i = 0; i < 2; i++) {
900
321528
                        if (USES_LIST(mb_type, i)) {
901
165424
                            s->field_select[i][0] = get_bits1(&s->gb);
902
496272
                            for (k = 0; k < 2; k++) {
903
330848
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
904
                                                         s->last_mv[i][0][k]);
905
330848
                                s->last_mv[i][0][k] = val;
906
330848
                                s->last_mv[i][1][k] = val;
907
330848
                                s->mv[i][0][k]      = val;
908
                            }
909
                        }
910
                    }
911
                }
912
224471
                break;
913
15164
            case MT_DMV:
914
15164
                if (s->progressive_sequence){
915
                    av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
916
                    return AVERROR_INVALIDDATA;
917
                }
918
15164
                s->mv_type = MV_TYPE_DMV;
919
45492
                for (i = 0; i < 2; i++) {
920
30328
                    if (USES_LIST(mb_type, i)) {
921
                        int dmx, dmy, mx, my, m;
922
15164
                        const int my_shift = s->picture_structure == PICT_FRAME;
923
924
15164
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
925
                                                s->last_mv[i][0][0]);
926
15164
                        s->last_mv[i][0][0] = mx;
927
15164
                        s->last_mv[i][1][0] = mx;
928
15164
                        dmx = get_dmv(s);
929
15164
                        my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
930
15164
                                                 s->last_mv[i][0][1] >> my_shift);
931
15164
                        dmy = get_dmv(s);
932
933
934
15164
                        s->last_mv[i][0][1] = my * (1 << my_shift);
935
15164
                        s->last_mv[i][1][1] = my * (1 << my_shift);
936
937
15164
                        s->mv[i][0][0] = mx;
938
15164
                        s->mv[i][0][1] = my;
939
15164
                        s->mv[i][1][0] = mx; // not used
940
15164
                        s->mv[i][1][1] = my; // not used
941
942
15164
                        if (s->picture_structure == PICT_FRAME) {
943
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
944
945
                            // m = 1 + 2 * s->top_field_first;
946
                            m = s->top_field_first ? 1 : 3;
947
948
                            /* top -> top pred */
949
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
950
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
951
                            m = 4 - m;
952
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
953
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
954
                        } else {
955
15164
                            mb_type |= MB_TYPE_16x16;
956
957
15164
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
958
15164
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
959
15164
                            if (s->picture_structure == PICT_TOP_FIELD)
960
13048
                                s->mv[i][2][1]--;
961
                            else
962
2116
                                s->mv[i][2][1]++;
963
                        }
964
                    }
965
                }
966
15164
                break;
967
            default:
968
                av_log(s->avctx, AV_LOG_ERROR,
969
                       "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
970
                return AVERROR_INVALIDDATA;
971
            }
972
        }
973
974
1630761
        s->mb_intra = 0;
975
1630761
        if (HAS_CBP(mb_type)) {
976
1295669
            s->bdsp.clear_blocks(s->block[0]);
977
978
1295669
            cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
979
1295669
            if (mb_block_count > 6) {
980
46345
                cbp *= 1 << mb_block_count - 6;
981
46345
                cbp  |= get_bits(&s->gb, mb_block_count - 6);
982
46345
                s->bdsp.clear_blocks(s->block[6]);
983
            }
984
1295669
            if (cbp <= 0) {
985
                av_log(s->avctx, AV_LOG_ERROR,
986
                       "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
987
                return AVERROR_INVALIDDATA;
988
            }
989
990
            // if 1, we memcpy blocks in xvmcvideo
991
            if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
992
                ff_xvmc_pack_pblocks(s, cbp);
993
994
1295669
            if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
995
1183927
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
996
                    for (i = 0; i < 6; i++) {
997
                        if (cbp & 32)
998
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
999
                        else
1000
                            s->block_last_index[i] = -1;
1001
                        cbp += cbp;
1002
                    }
1003
                } else {
1004
1183927
                    cbp <<= 12 - mb_block_count;
1005
1006
8380179
                    for (i = 0; i < mb_block_count; i++) {
1007
7196252
                        if (cbp & (1 << 11)) {
1008
3807658
                            if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1009
                                return ret;
1010
                        } else {
1011
3388594
                            s->block_last_index[i] = -1;
1012
                        }
1013
7196252
                        cbp += cbp;
1014
                    }
1015
                }
1016
            } else {
1017
111742
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1018
                    for (i = 0; i < 6; i++) {
1019
                        if (cbp & 32)
1020
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1021
                        else
1022
                            s->block_last_index[i] = -1;
1023
                        cbp += cbp;
1024
                    }
1025
                } else {
1026
782194
                    for (i = 0; i < 6; i++) {
1027
670452
                        if (cbp & 32) {
1028
403118
                            if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1029
                                return ret;
1030
                        } else {
1031
267334
                            s->block_last_index[i] = -1;
1032
                        }
1033
670452
                        cbp += cbp;
1034
                    }
1035
                }
1036
            }
1037
        } else {
1038
4356196
            for (i = 0; i < 12; i++)
1039
4021104
                s->block_last_index[i] = -1;
1040
        }
1041
    }
1042
1043
1904665
    s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1044
1045
1904665
    return 0;
1046
}
1047
1048
255
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1049
{
1050
255
    Mpeg1Context *s    = avctx->priv_data;
1051
255
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1052
1053
255
    ff_mpv_decode_defaults(s2);
1054
1055
255
    if (   avctx->codec_tag != AV_RL32("VCR2")
1056
253
        && avctx->codec_tag != AV_RL32("BW10"))
1057
253
        avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1058
255
    ff_mpv_decode_init(s2, avctx);
1059
1060
255
    s->mpeg_enc_ctx.avctx  = avctx;
1061
1062
    /* we need some permutation to store matrices,
1063
     * until the decoder sets the real permutation. */
1064
255
    ff_mpv_idct_init(s2);
1065
255
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1066
255
    ff_mpeg12_init_vlcs();
1067
1068
255
    s2->chroma_format              = 1;
1069
255
    s->mpeg_enc_ctx_allocated      = 0;
1070
255
    s->mpeg_enc_ctx.picture_number = 0;
1071
255
    s->repeat_field                = 0;
1072
255
    s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1073
255
    avctx->color_range             = AVCOL_RANGE_MPEG;
1074
255
    return 0;
1075
}
1076
1077
#if HAVE_THREADS
1078
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1079
                                             const AVCodecContext *avctx_from)
1080
{
1081
    Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1082
    MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1083
    int err;
1084
1085
    if (avctx == avctx_from               ||
1086
        !ctx_from->mpeg_enc_ctx_allocated ||
1087
        !s1->context_initialized)
1088
        return 0;
1089
1090
    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1091
    if (err)
1092
        return err;
1093
1094
    if (!ctx->mpeg_enc_ctx_allocated)
1095
        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1096
1097
    if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1098
        s->picture_number++;
1099
1100
    return 0;
1101
}
1102
#endif
1103
1104
956
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1105
                                 const uint8_t *new_perm)
1106
{
1107
    uint16_t temp_matrix[64];
1108
    int i;
1109
1110
956
    memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1111
1112
62140
    for (i = 0; i < 64; i++)
1113
61184
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1114
956
}
1115
1116
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1117
#if CONFIG_MPEG1_NVDEC_HWACCEL
1118
    AV_PIX_FMT_CUDA,
1119
#endif
1120
#if CONFIG_MPEG1_XVMC_HWACCEL
1121
    AV_PIX_FMT_XVMC,
1122
#endif
1123
#if CONFIG_MPEG1_VDPAU_HWACCEL
1124
    AV_PIX_FMT_VDPAU,
1125
#endif
1126
    AV_PIX_FMT_YUV420P,
1127
    AV_PIX_FMT_NONE
1128
};
1129
1130
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1131
#if CONFIG_MPEG2_NVDEC_HWACCEL
1132
    AV_PIX_FMT_CUDA,
1133
#endif
1134
#if CONFIG_MPEG2_XVMC_HWACCEL
1135
    AV_PIX_FMT_XVMC,
1136
#endif
1137
#if CONFIG_MPEG2_VDPAU_HWACCEL
1138
    AV_PIX_FMT_VDPAU,
1139
#endif
1140
#if CONFIG_MPEG2_DXVA2_HWACCEL
1141
    AV_PIX_FMT_DXVA2_VLD,
1142
#endif
1143
#if CONFIG_MPEG2_D3D11VA_HWACCEL
1144
    AV_PIX_FMT_D3D11VA_VLD,
1145
    AV_PIX_FMT_D3D11,
1146
#endif
1147
#if CONFIG_MPEG2_VAAPI_HWACCEL
1148
    AV_PIX_FMT_VAAPI,
1149
#endif
1150
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1151
    AV_PIX_FMT_VIDEOTOOLBOX,
1152
#endif
1153
    AV_PIX_FMT_YUV420P,
1154
    AV_PIX_FMT_NONE
1155
};
1156
1157
static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1158
    AV_PIX_FMT_YUV422P,
1159
    AV_PIX_FMT_NONE
1160
};
1161
1162
static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1163
    AV_PIX_FMT_YUV444P,
1164
    AV_PIX_FMT_NONE
1165
};
1166
1167
241
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1168
{
1169
241
    Mpeg1Context *s1  = avctx->priv_data;
1170
241
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1171
    const enum AVPixelFormat *pix_fmts;
1172
1173
    if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1174
        return AV_PIX_FMT_GRAY8;
1175
1176
241
    if (s->chroma_format < 2)
1177
185
        pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1178
185
                                mpeg1_hwaccel_pixfmt_list_420 :
1179
                                mpeg2_hwaccel_pixfmt_list_420;
1180
56
    else if (s->chroma_format == 2)
1181
56
        pix_fmts = mpeg12_pixfmt_list_422;
1182
    else
1183
        pix_fmts = mpeg12_pixfmt_list_444;
1184
1185
241
    return ff_thread_get_format(avctx, pix_fmts);
1186
}
1187
1188
241
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1189
{
1190
    // until then pix_fmt may be changed right after codec init
1191
241
    if (avctx->hwaccel)
1192
        if (avctx->idct_algo == FF_IDCT_AUTO)
1193
            avctx->idct_algo = FF_IDCT_NONE;
1194
1195

241
    if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1196
        Mpeg1Context *s1 = avctx->priv_data;
1197
        MpegEncContext *s = &s1->mpeg_enc_ctx;
1198
1199
        s->pack_pblocks = 1;
1200
    }
1201
241
}
1202
1203
/* Call this function when we know all parameters.
1204
 * It may be called in different places for MPEG-1 and MPEG-2. */
1205
4454
static int mpeg_decode_postinit(AVCodecContext *avctx)
1206
{
1207
4454
    Mpeg1Context *s1  = avctx->priv_data;
1208
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1209
    uint8_t old_permutation[64];
1210
    int ret;
1211
1212
4454
    if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1213
        // MPEG-1 aspect
1214
494
        AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1215
494
        avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1216
    } else { // MPEG-2
1217
        // MPEG-2 aspect
1218
3960
        if (s->aspect_ratio_info > 1) {
1219
            AVRational dar =
1220
1947
                av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1221
1947
                                  (AVRational) { s1->pan_scan.width,
1222
1947
                                                 s1->pan_scan.height }),
1223
1947
                         (AVRational) { s->width, s->height });
1224
1225
            /* We ignore the spec here and guess a bit as reality does not
1226
             * match the spec, see for example res_change_ffmpeg_aspect.ts
1227
             * and sequence-display-aspect.mpg.
1228
             * issue1613, 621, 562 */
1229

2239
            if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1230
306
                (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1231
14
                 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1232
1669
                s->avctx->sample_aspect_ratio =
1233
1669
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1234
1669
                             (AVRational) { s->width, s->height });
1235
            } else {
1236
278
                s->avctx->sample_aspect_ratio =
1237
278
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1238
278
                             (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1239
// issue1613 4/3 16/9 -> 16/9
1240
// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1241
// widescreen-issue562.mpg 4/3 16/9 -> 16/9
1242
//                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1243
                ff_dlog(avctx, "aspect A %d/%d\n",
1244
                        ff_mpeg2_aspect[s->aspect_ratio_info].num,
1245
                        ff_mpeg2_aspect[s->aspect_ratio_info].den);
1246
                ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1247
                        s->avctx->sample_aspect_ratio.den);
1248
            }
1249
        } else {
1250
2013
            s->avctx->sample_aspect_ratio =
1251
2013
                ff_mpeg2_aspect[s->aspect_ratio_info];
1252
        }
1253
    } // MPEG-2
1254
1255
4454
    if (av_image_check_sar(s->width, s->height,
1256
                           avctx->sample_aspect_ratio) < 0) {
1257
        av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1258
                avctx->sample_aspect_ratio.num,
1259
                avctx->sample_aspect_ratio.den);
1260
        avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1261
    }
1262
1263
4454
    if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1264
4217
        avctx->coded_width       != s->width                ||
1265
4217
        avctx->coded_height      != s->height               ||
1266
4217
        s1->save_width           != s->width                ||
1267

8434
        s1->save_height          != s->height               ||
1268
4217
        av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1269

4215
        (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1270
        0) {
1271
239
        if (s1->mpeg_enc_ctx_allocated) {
1272
2
            ParseContext pc = s->parse_context;
1273
2
            s->parse_context.buffer = 0;
1274
2
            ff_mpv_common_end(s);
1275
2
            s->parse_context = pc;
1276
2
            s1->mpeg_enc_ctx_allocated = 0;
1277
        }
1278
1279
239
        ret = ff_set_dimensions(avctx, s->width, s->height);
1280
239
        if (ret < 0)
1281
            return ret;
1282
1283

239
        if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1284
212
            avctx->rc_max_rate = s->bit_rate;
1285

27
        } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1286

25
                   (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1287
25
            avctx->bit_rate = s->bit_rate;
1288
        }
1289
239
        s1->save_aspect          = s->avctx->sample_aspect_ratio;
1290
239
        s1->save_width           = s->width;
1291
239
        s1->save_height          = s->height;
1292
239
        s1->save_progressive_seq = s->progressive_sequence;
1293
1294
        /* low_delay may be forced, in this case we will have B-frames
1295
         * that behave like P-frames. */
1296
239
        avctx->has_b_frames = !s->low_delay;
1297
1298
239
        if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1299
            // MPEG-1 fps
1300
25
            avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1301
25
            avctx->ticks_per_frame     = 1;
1302
1303
25
            avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1304
        } else { // MPEG-2
1305
            // MPEG-2 fps
1306
214
            av_reduce(&s->avctx->framerate.num,
1307
214
                      &s->avctx->framerate.den,
1308
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1309
214
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1310
                      1 << 30);
1311
214
            avctx->ticks_per_frame = 2;
1312
1313
214
            switch (s->chroma_format) {
1314
158
            case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1315
56
            case 2:
1316
56
            case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1317
            default: av_assert0(0);
1318
            }
1319
        } // MPEG-2
1320
1321
239
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1322
239
        setup_hwaccel_for_pixfmt(avctx);
1323
1324
        /* Quantization matrices may need reordering
1325
         * if DCT permutation is changed. */
1326
239
        memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1327
1328
239
        ff_mpv_idct_init(s);
1329
239
        if ((ret = ff_mpv_common_init(s)) < 0)
1330
            return ret;
1331
1332
239
        quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1333
239
        quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1334
239
        quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1335
239
        quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1336
1337
239
        s1->mpeg_enc_ctx_allocated = 1;
1338
    }
1339
4454
    return 0;
1340
}
1341
1342
4454
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1343
                                int buf_size)
1344
{
1345
4454
    Mpeg1Context *s1  = avctx->priv_data;
1346
4454
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1347
    int ref, f_code, vbv_delay;
1348
1349
4454
    init_get_bits(&s->gb, buf, buf_size * 8);
1350
1351
4454
    ref = get_bits(&s->gb, 10); /* temporal ref */
1352
4454
    s->pict_type = get_bits(&s->gb, 3);
1353

4454
    if (s->pict_type == 0 || s->pict_type > 3)
1354
        return AVERROR_INVALIDDATA;
1355
1356
4454
    vbv_delay = get_bits(&s->gb, 16);
1357
4454
    s->vbv_delay = vbv_delay;
1358
4454
    if (s->pict_type == AV_PICTURE_TYPE_P ||
1359
2103
        s->pict_type == AV_PICTURE_TYPE_B) {
1360
3791
        s->full_pel[0] = get_bits1(&s->gb);
1361
3791
        f_code = get_bits(&s->gb, 3);
1362

3791
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1363
            return AVERROR_INVALIDDATA;
1364
3791
        f_code += !f_code;
1365
3791
        s->mpeg_f_code[0][0] = f_code;
1366
3791
        s->mpeg_f_code[0][1] = f_code;
1367
    }
1368
4454
    if (s->pict_type == AV_PICTURE_TYPE_B) {
1369
1440
        s->full_pel[1] = get_bits1(&s->gb);
1370
1440
        f_code = get_bits(&s->gb, 3);
1371

1440
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1372
            return AVERROR_INVALIDDATA;
1373
1440
        f_code += !f_code;
1374
1440
        s->mpeg_f_code[1][0] = f_code;
1375
1440
        s->mpeg_f_code[1][1] = f_code;
1376
    }
1377
4454
    s->current_picture.f->pict_type = s->pict_type;
1378
4454
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1379
1380
4454
    if (avctx->debug & FF_DEBUG_PICT_INFO)
1381
        av_log(avctx, AV_LOG_DEBUG,
1382
               "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1383
1384
4454
    s->y_dc_scale = 8;
1385
4454
    s->c_dc_scale = 8;
1386
4454
    return 0;
1387
}
1388
1389
649
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1390
{
1391
649
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1392
    int horiz_size_ext, vert_size_ext;
1393
    int bit_rate_ext;
1394
    AVCPBProperties *cpb_props;
1395
1396
649
    skip_bits(&s->gb, 1); /* profile and level esc*/
1397
649
    s->avctx->profile       = get_bits(&s->gb, 3);
1398
649
    s->avctx->level         = get_bits(&s->gb, 4);
1399
649
    s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1400
649
    s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1401
1402
649
    if (!s->chroma_format) {
1403
        s->chroma_format = 1;
1404
        av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1405
    }
1406
1407
649
    horiz_size_ext          = get_bits(&s->gb, 2);
1408
649
    vert_size_ext           = get_bits(&s->gb, 2);
1409
649
    s->width  |= (horiz_size_ext << 12);
1410
649
    s->height |= (vert_size_ext  << 12);
1411
649
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1412
649
    s->bit_rate += (bit_rate_ext << 18) * 400LL;
1413
649
    check_marker(s->avctx, &s->gb, "after bit rate extension");
1414
649
    s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1415
1416
649
    s->low_delay = get_bits1(&s->gb);
1417
649
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1418
        s->low_delay = 1;
1419
1420
649
    s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1421
649
    s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1422
1423
    ff_dlog(s->avctx, "sequence extension\n");
1424
649
    s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1425
1426
649
    if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1427
649
        cpb_props->buffer_size = s1->rc_buffer_size;
1428
649
        if (s->bit_rate != 0x3FFFF*400)
1429
232
            cpb_props->max_bitrate = s->bit_rate;
1430
    }
1431
1432
649
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1433
        av_log(s->avctx, AV_LOG_DEBUG,
1434
               "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1435
               s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1436
               s1->rc_buffer_size, s->bit_rate);
1437
649
}
1438
1439
61
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1440
{
1441
61
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1442
    int color_description, w, h;
1443
1444
61
    skip_bits(&s->gb, 3); /* video format */
1445
61
    color_description = get_bits1(&s->gb);
1446
61
    if (color_description) {
1447
29
        s->avctx->color_primaries = get_bits(&s->gb, 8);
1448
29
        s->avctx->color_trc       = get_bits(&s->gb, 8);
1449
29
        s->avctx->colorspace      = get_bits(&s->gb, 8);
1450
    }
1451
61
    w = get_bits(&s->gb, 14);
1452
61
    skip_bits(&s->gb, 1); // marker
1453
61
    h = get_bits(&s->gb, 14);
1454
    // remaining 3 bits are zero padding
1455
1456
61
    s1->pan_scan.width  = 16 * w;
1457
61
    s1->pan_scan.height = 16 * h;
1458
1459
61
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1460
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1461
61
}
1462
1463
15
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1464
{
1465
15
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1466
    int i, nofco;
1467
1468
15
    nofco = 1;
1469
15
    if (s->progressive_sequence) {
1470
        if (s->repeat_first_field) {
1471
            nofco++;
1472
            if (s->top_field_first)
1473
                nofco++;
1474
        }
1475
    } else {
1476
15
        if (s->picture_structure == PICT_FRAME) {
1477
5
            nofco++;
1478
5
            if (s->repeat_first_field)
1479
3
                nofco++;
1480
        }
1481
    }
1482
38
    for (i = 0; i < nofco; i++) {
1483
23
        s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1484
23
        skip_bits(&s->gb, 1); // marker
1485
23
        s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1486
23
        skip_bits(&s->gb, 1); // marker
1487
    }
1488
1489
15
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1490
        av_log(s->avctx, AV_LOG_DEBUG,
1491
               "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1492
               s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1493
               s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1494
               s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1495
15
}
1496
1497
147
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1498
                       uint16_t matrix1[64], int intra)
1499
{
1500
    int i;
1501
1502
9555
    for (i = 0; i < 64; i++) {
1503
9408
        int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1504
9408
        int v = get_bits(&s->gb, 8);
1505
9408
        if (v == 0) {
1506
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1507
            return AVERROR_INVALIDDATA;
1508
        }
1509

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

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

7576
    if (s->first_field || s->picture_structure == PICT_FRAME) {
1606
        AVFrameSideData *pan_scan;
1607
1608
3487
        if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1609
            return ret;
1610
1611
3487
        ff_mpeg_er_frame_start(s);
1612
1613
        /* first check if we must repeat the frame */
1614
3487
        s->current_picture_ptr->f->repeat_pict = 0;
1615
3487
        if (s->repeat_first_field) {
1616
3
            if (s->progressive_sequence) {
1617
                if (s->top_field_first)
1618
                    s->current_picture_ptr->f->repeat_pict = 4;
1619
                else
1620
                    s->current_picture_ptr->f->repeat_pict = 2;
1621
3
            } else if (s->progressive_frame) {
1622
3
                s->current_picture_ptr->f->repeat_pict = 1;
1623
            }
1624
        }
1625
1626
3487
        pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1627
                                          AV_FRAME_DATA_PANSCAN,
1628
                                          sizeof(s1->pan_scan));
1629
3487
        if (!pan_scan)
1630
            return AVERROR(ENOMEM);
1631
3487
        memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1632
1633
3487
        if (s1->a53_buf_ref) {
1634
472
            AVFrameSideData *sd = av_frame_new_side_data_from_buf(
1635
472
                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1636
                s1->a53_buf_ref);
1637
472
            if (!sd)
1638
                av_buffer_unref(&s1->a53_buf_ref);
1639
472
            s1->a53_buf_ref = NULL;
1640
        }
1641
1642
3487
        if (s1->has_stereo3d) {
1643
            AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1644
            if (!stereo)
1645
                return AVERROR(ENOMEM);
1646
1647
            *stereo = s1->stereo3d;
1648
            s1->has_stereo3d = 0;
1649
        }
1650
1651
3487
        if (s1->has_afd) {
1652
            AVFrameSideData *sd =
1653
202
                av_frame_new_side_data(s->current_picture_ptr->f,
1654
                                       AV_FRAME_DATA_AFD, 1);
1655
202
            if (!sd)
1656
                return AVERROR(ENOMEM);
1657
1658
202
            *sd->data   = s1->afd;
1659
202
            s1->has_afd = 0;
1660
        }
1661
1662
3487
        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1663
            ff_thread_finish_setup(avctx);
1664
    } else { // second field
1665
        int i;
1666
1667
602
        if (!s->current_picture_ptr) {
1668
            av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1669
            return AVERROR_INVALIDDATA;
1670
        }
1671
1672
602
        if (s->avctx->hwaccel) {
1673
            if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1674
                av_log(avctx, AV_LOG_ERROR,
1675
                       "hardware accelerator failed to decode first field\n");
1676
                return ret;
1677
            }
1678
        }
1679
1680
3010
        for (i = 0; i < 4; i++) {
1681
2408
            s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1682
2408
            if (s->picture_structure == PICT_BOTTOM_FIELD)
1683
4
                s->current_picture.f->data[i] +=
1684
4
                    s->current_picture_ptr->f->linesize[i];
1685
        }
1686
    }
1687
1688
4089
    if (avctx->hwaccel) {
1689
        if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1690
            return ret;
1691
    }
1692
1693
4089
    return 0;
1694
}
1695
1696
#define DECODE_SLICE_ERROR -1
1697
#define DECODE_SLICE_OK     0
1698
1699
/**
1700
 * Decode a slice.
1701
 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1702
 * @return DECODE_SLICE_ERROR if the slice is damaged,
1703
 *         DECODE_SLICE_OK if this slice is OK
1704
 */
1705
111335
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1706
                             const uint8_t **buf, int buf_size)
1707
{
1708
111335
    AVCodecContext *avctx = s->avctx;
1709
111335
    const int lowres      = s->avctx->lowres;
1710
111335
    const int field_pic   = s->picture_structure != PICT_FRAME;
1711
    int ret;
1712
1713
111335
    s->resync_mb_x =
1714
111335
    s->resync_mb_y = -1;
1715
1716
111335
    av_assert0(mb_y < s->mb_height);
1717
1718
111335
    init_get_bits(&s->gb, *buf, buf_size * 8);
1719

111335
    if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1720
        skip_bits(&s->gb, 3);
1721
1722
111335
    ff_mpeg1_clean_buffers(s);
1723
111335
    s->interlaced_dct = 0;
1724
1725
111335
    s->qscale = mpeg_get_qscale(s);
1726
1727
111335
    if (s->qscale == 0) {
1728
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1729
        return AVERROR_INVALIDDATA;
1730
    }
1731
1732
    /* extra slice info */
1733
111335
    if (skip_1stop_8data_bits(&s->gb) < 0)
1734
        return AVERROR_INVALIDDATA;
1735
1736
111335
    s->mb_x = 0;
1737
1738

111335
    if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1739
        skip_bits1(&s->gb);
1740
    } else {
1741
123534
        while (get_bits_left(&s->gb) > 0) {
1742
123534
            int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1743
                                MBINCR_VLC_BITS, 2);
1744
123534
            if (code < 0) {
1745
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1746
                return AVERROR_INVALIDDATA;
1747
            }
1748
123534
            if (code >= 33) {
1749
12199
                if (code == 33)
1750
12199
                    s->mb_x += 33;
1751
                /* otherwise, stuffing, nothing to do */
1752
            } else {
1753
111335
                s->mb_x += code;
1754
111335
                break;
1755
            }
1756
        }
1757
    }
1758
1759
111335
    if (s->mb_x >= (unsigned) s->mb_width) {
1760
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1761
        return AVERROR_INVALIDDATA;
1762
    }
1763
1764

111335
    if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1765
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1766
        int start_code = -1;
1767
        buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1768
        if (buf_end < *buf + buf_size)
1769
            buf_end -= 4;
1770
        s->mb_y = mb_y;
1771
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1772
            return DECODE_SLICE_ERROR;
1773
        *buf = buf_end;
1774
        return DECODE_SLICE_OK;
1775
    }
1776
1777
111335
    s->resync_mb_x = s->mb_x;
1778
111335
    s->resync_mb_y = s->mb_y = mb_y;
1779
111335
    s->mb_skip_run = 0;
1780
111335
    ff_init_block_index(s);
1781
1782


111335
    if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1783
2886
        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1784
            av_log(s->avctx, AV_LOG_DEBUG,
1785
                   "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",
1786
                   s->qscale,
1787
                   s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1788
                   s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1789
                   s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1790
                   (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1791
                   (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1792
                   s->progressive_sequence ? "ps"  : "",
1793
                   s->progressive_frame    ? "pf"  : "",
1794
                   s->alternate_scan       ? "alt" : "",
1795
                   s->top_field_first      ? "top" : "",
1796
                   s->intra_dc_precision, s->picture_structure,
1797
                   s->frame_pred_frame_dct, s->concealment_motion_vectors,
1798
                   s->q_scale_type, s->intra_vlc_format,
1799
                   s->repeat_first_field, s->chroma_420_type ? "420" : "");
1800
        }
1801
    }
1802
1803
    for (;;) {
1804
        // If 1, we memcpy blocks in xvmcvideo.
1805
1948043
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1806
            ff_xvmc_init_block(s); // set s->block
1807
1808
2059378
        if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1809
4
            return ret;
1810
1811
        // Note motion_val is normally NULL unless we want to extract the MVs.
1812

2059374
        if (s->current_picture.motion_val[0] && !s->encoding) {
1813
            const int wrap = s->b8_stride;
1814
            int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1815
            int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1816
            int motion_x, motion_y, dir, i;
1817
1818
            for (i = 0; i < 2; i++) {
1819
                for (dir = 0; dir < 2; dir++) {
1820
                    if (s->mb_intra ||
1821
                        (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1822
                        motion_x = motion_y = 0;
1823
                    } else if (s->mv_type == MV_TYPE_16X16 ||
1824
                               (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1825
                        motion_x = s->mv[dir][0][0];
1826
                        motion_y = s->mv[dir][0][1];
1827
                    } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1828
                        motion_x = s->mv[dir][i][0];
1829
                        motion_y = s->mv[dir][i][1];
1830
                    }
1831
1832
                    s->current_picture.motion_val[dir][xy][0]     = motion_x;
1833
                    s->current_picture.motion_val[dir][xy][1]     = motion_y;
1834
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1835
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1836
                    s->current_picture.ref_index [dir][b8_xy]     =
1837
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1838
                    av_assert2(s->field_select[dir][i] == 0 ||
1839
                               s->field_select[dir][i] == 1);
1840
                }
1841
                xy    += wrap;
1842
                b8_xy += 2;
1843
            }
1844
        }
1845
1846
2059374
        s->dest[0] += 16 >> lowres;
1847
2059374
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1848
2059374
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1849
1850
2059374
        ff_mpv_reconstruct_mb(s, s->block);
1851
1852
2059374
        if (++s->mb_x >= s->mb_width) {
1853
66414
            const int mb_size = 16 >> s->avctx->lowres;
1854
            int left;
1855
1856
66414
            ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1857
66414
            ff_mpv_report_decode_progress(s);
1858
1859
66414
            s->mb_x  = 0;
1860
66414
            s->mb_y += 1 << field_pic;
1861
1862
66414
            if (s->mb_y >= s->mb_height) {
1863
4085
                int left   = get_bits_left(&s->gb);
1864
8431
                int is_d10 = s->chroma_format == 2 &&
1865
261
                             s->pict_type == AV_PICTURE_TYPE_I &&
1866

49
                             avctx->profile == 0 && avctx->level == 5 &&
1867
49
                             s->intra_dc_precision == 2 &&
1868

4371
                             s->q_scale_type == 1 && s->alternate_scan == 0 &&
1869
25
                             s->progressive_frame == 0
1870
                             /* vbv_delay == 0xBBB || 0xE10 */;
1871
1872

4085
                if (left >= 32 && !is_d10) {
1873
1002
                    GetBitContext gb = s->gb;
1874
1002
                    align_get_bits(&gb);
1875
1002
                    if (show_bits(&gb, 24) == 0x060E2B) {
1876
                        av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1877
                        is_d10 = 1;
1878
                    }
1879

1002
                    if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1880
                        av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1881
                        goto eos;
1882
                    }
1883
                }
1884
1885

4085
                if (left < 0 ||
1886

3788
                    (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1887

4085
                    ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1888
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1889
                           left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1890
                    return AVERROR_INVALIDDATA;
1891
                } else
1892
4085
                    goto eos;
1893
            }
1894
            // There are some files out there which are missing the last slice
1895
            // in cases where the slice is completely outside the visible
1896
            // area, we detect this here instead of running into the end expecting
1897
            // more data
1898
62329
            left = get_bits_left(&s->gb);
1899
62329
            if (s->mb_y >= ((s->height + 15) >> 4) &&
1900

200
                !s->progressive_sequence &&
1901
                left <= 25 &&
1902
                left >= 0 &&
1903
                s->mb_skip_run == -1 &&
1904
                (!left || show_bits(&s->gb, left) == 0))
1905
                goto eos;
1906
1907
62329
            ff_init_block_index(s);
1908
        }
1909
1910
        /* skip mb handling */
1911
2055289
        if (s->mb_skip_run == -1) {
1912
            /* read increment again */
1913
1900580
            s->mb_skip_run = 0;
1914
1229
            for (;;) {
1915
1901809
                int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1916
                                    MBINCR_VLC_BITS, 2);
1917
1901809
                if (code < 0) {
1918
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1919
                    return AVERROR_INVALIDDATA;
1920
                }
1921
1901809
                if (code >= 33) {
1922
108475
                    if (code == 33) {
1923
1229
                        s->mb_skip_run += 33;
1924
107246
                    } else if (code == 35) {
1925

107246
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1926
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1927
                            return AVERROR_INVALIDDATA;
1928
                        }
1929
107246
                        goto eos; /* end of slice */
1930
                    }
1931
                    /* otherwise, stuffing, nothing to do */
1932
                } else {
1933
1793334
                    s->mb_skip_run += code;
1934
1793334
                    break;
1935
                }
1936
            }
1937
1793334
            if (s->mb_skip_run) {
1938
                int i;
1939
57259
                if (s->pict_type == AV_PICTURE_TYPE_I) {
1940
                    av_log(s->avctx, AV_LOG_ERROR,
1941
                           "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1942
                    return AVERROR_INVALIDDATA;
1943
                }
1944
1945
                /* skip mb */
1946
57259
                s->mb_intra = 0;
1947
744367
                for (i = 0; i < 12; i++)
1948
687108
                    s->block_last_index[i] = -1;
1949
57259
                if (s->picture_structure == PICT_FRAME)
1950
39187
                    s->mv_type = MV_TYPE_16X16;
1951
                else
1952
18072
                    s->mv_type = MV_TYPE_FIELD;
1953
57259
                if (s->pict_type == AV_PICTURE_TYPE_P) {
1954
                    /* if P type, zero motion vector is implied */
1955
20815
                    s->mv_dir             = MV_DIR_FORWARD;
1956
20815
                    s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1957
20815
                    s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1958
20815
                    s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1959
20815
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1960
                } else {
1961
                    /* if B type, reuse previous vectors and directions */
1962
36444
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1963
36444
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1964
36444
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1965
36444
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1966
36444
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1967
36444
                    s->field_select[1][0] = (s->picture_structure - 1) & 1;
1968
                }
1969
            }
1970
        }
1971
    }
1972
111331
eos: // end of slice
1973
111331
    if (get_bits_left(&s->gb) < 0) {
1974
        av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1975
        return AVERROR_INVALIDDATA;
1976
    }
1977
111331
    *buf += (get_bits_count(&s->gb) - 1) / 8;
1978
    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);
1979
111331
    return 0;
1980
}
1981
1982
4248
static int slice_decode_thread(AVCodecContext *c, void *arg)
1983
{
1984
4248
    MpegEncContext *s   = *(void **) arg;
1985
4248
    const uint8_t *buf  = s->gb.buffer;
1986
4248
    int mb_y            = s->start_mb_y;
1987
4248
    const int field_pic = s->picture_structure != PICT_FRAME;
1988
1989
4248
    s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1990
1991
9912
    for (;;) {
1992
        uint32_t start_code;
1993
        int ret;
1994
1995
14160
        ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1996
14160
        emms_c();
1997
        ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1998
                ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1999
                s->start_mb_y, s->end_mb_y, s->er.error_count);
2000
14160
        if (ret < 0) {
2001
            if (c->err_recognition & AV_EF_EXPLODE)
2002
4248
                return ret;
2003
            if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2004
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2005
                                s->mb_x, s->mb_y,
2006
                                ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2007
        } else {
2008
14160
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2009
14160
                            s->mb_x - 1, s->mb_y,
2010
                            ER_AC_END | ER_DC_END | ER_MV_END);
2011
        }
2012
2013
14160
        if (s->mb_y == s->end_mb_y)
2014
4248
            return 0;
2015
2016
9912
        start_code = -1;
2017
9912
        buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2018

9912
        if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2019
            return AVERROR_INVALIDDATA;
2020
9912
        mb_y       = start_code - SLICE_MIN_START_CODE;
2021

9912
        if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2022
            mb_y += (*buf&0xE0)<<2;
2023
9912
        mb_y <<= field_pic;
2024
9912
        if (s->picture_structure == PICT_BOTTOM_FIELD)
2025
            mb_y++;
2026
9912
        if (mb_y >= s->end_mb_y)
2027
            return AVERROR_INVALIDDATA;
2028
    }
2029
}
2030
2031
/**
2032
 * Handle slice ends.
2033
 * @return 1 if it seems to be the last slice
2034
 */
2035
3747
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2036
{
2037
3747
    Mpeg1Context *s1  = avctx->priv_data;
2038
3747
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2039
2040

3747
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2041
259
        return 0;
2042
2043
3488
    if (s->avctx->hwaccel) {
2044
        int ret = s->avctx->hwaccel->end_frame(s->avctx);
2045
        if (ret < 0) {
2046
            av_log(avctx, AV_LOG_ERROR,
2047
                   "hardware accelerator failed to decode picture\n");
2048
            return ret;
2049
        }
2050
    }
2051
2052
    /* end of slice reached */
2053

3488
    if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2054
        /* end of image */
2055
2056
3487
        ff_er_frame_end(&s->er);
2057
2058
3487
        ff_mpv_frame_end(s);
2059
2060

5160
        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2061
1673
            int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2062
1673
            if (ret < 0)
2063
                return ret;
2064
1673
            ff_print_debug_info(s, s->current_picture_ptr, pict);
2065
1673
            ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2066
        } else {
2067
1814
            if (avctx->active_thread_type & FF_THREAD_FRAME)
2068
                s->picture_number++;
2069
            /* latency of 1 frame for I- and P-frames */
2070
            /* XXX: use another variable than picture_number */
2071
1814
            if (s->last_picture_ptr) {
2072
1755
                int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2073
1755
                if (ret < 0)
2074
                    return ret;
2075
1755
                ff_print_debug_info(s, s->last_picture_ptr, pict);
2076
1755
                ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2077
            }
2078
        }
2079
2080
3487
        return 1;
2081
    } else {
2082
1
        return 0;
2083
    }
2084
}
2085
2086
741
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2087
                                 const uint8_t *buf, int buf_size)
2088
{
2089
741
    Mpeg1Context *s1  = avctx->priv_data;
2090
741
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2091
    int width, height;
2092
    int i, v, j;
2093
2094
741
    init_get_bits(&s->gb, buf, buf_size * 8);
2095
2096
741
    width  = get_bits(&s->gb, 12);
2097
741
    height = get_bits(&s->gb, 12);
2098

741
    if (width == 0 || height == 0) {
2099
        av_log(avctx, AV_LOG_WARNING,
2100
               "Invalid horizontal or vertical size value.\n");
2101
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2102
            return AVERROR_INVALIDDATA;
2103
    }
2104
741
    s->aspect_ratio_info = get_bits(&s->gb, 4);
2105
741
    if (s->aspect_ratio_info == 0) {
2106
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2107
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2108
            return AVERROR_INVALIDDATA;
2109
    }
2110
741
    s->frame_rate_index = get_bits(&s->gb, 4);
2111

741
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2112
        av_log(avctx, AV_LOG_WARNING,
2113
               "frame_rate_index %d is invalid\n", s->frame_rate_index);
2114
        s->frame_rate_index = 1;
2115
    }
2116
741
    s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2117
741
    if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2118
        return AVERROR_INVALIDDATA;
2119
    }
2120
2121
741
    s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2122
741
    skip_bits(&s->gb, 1);
2123
2124
    /* get matrix */
2125
741
    if (get_bits1(&s->gb)) {
2126
18
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2127
    } else {
2128
46995
        for (i = 0; i < 64; i++) {
2129
46272
            j = s->idsp.idct_permutation[i];
2130
46272
            v = ff_mpeg1_default_intra_matrix[i];
2131
46272
            s->intra_matrix[j]        = v;
2132
46272
            s->chroma_intra_matrix[j] = v;
2133
        }
2134
    }
2135
741
    if (get_bits1(&s->gb)) {
2136
54
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2137
    } else {
2138
44655
        for (i = 0; i < 64; i++) {
2139
43968
            int j = s->idsp.idct_permutation[i];
2140
43968
            v = ff_mpeg1_default_non_intra_matrix[i];
2141
43968
            s->inter_matrix[j]        = v;
2142
43968
            s->chroma_inter_matrix[j] = v;
2143
        }
2144
    }
2145
2146
741
    if (show_bits(&s->gb, 23) != 0) {
2147
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2148
        return AVERROR_INVALIDDATA;
2149
    }
2150
2151
741
    s->width  = width;
2152
741
    s->height = height;
2153
2154
    /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2155
741
    s->progressive_sequence = 1;
2156
741
    s->progressive_frame    = 1;
2157
741
    s->picture_structure    = PICT_FRAME;
2158
741
    s->first_field          = 0;
2159
741
    s->frame_pred_frame_dct = 1;
2160
741
    s->chroma_format        = 1;
2161
741
    s->codec_id             =
2162
741
    s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2163
741
    s->out_format           = FMT_MPEG1;
2164
741
    s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2165
741
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2166
        s->low_delay = 1;
2167
2168
741
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2169
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2170
               s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2171
2172
741
    return 0;
2173
}
2174
2175
2
static int vcr2_init_sequence(AVCodecContext *avctx)
2176
{
2177
2
    Mpeg1Context *s1  = avctx->priv_data;
2178
2
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2179
    int i, v, ret;
2180
2181
    /* start new MPEG-1 context decoding */
2182
2
    s->out_format = FMT_MPEG1;
2183
2
    if (s1->mpeg_enc_ctx_allocated) {
2184
        ff_mpv_common_end(s);
2185
        s1->mpeg_enc_ctx_allocated = 0;
2186
    }
2187
2
    s->width            = avctx->coded_width;
2188
2
    s->height           = avctx->coded_height;
2189
2
    avctx->has_b_frames = 0; // true?
2190
2
    s->low_delay        = 1;
2191
2192
2
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2193
2
    setup_hwaccel_for_pixfmt(avctx);
2194
2195
2
    ff_mpv_idct_init(s);
2196
2
    if ((ret = ff_mpv_common_init(s)) < 0)
2197
        return ret;
2198
2
    s1->mpeg_enc_ctx_allocated = 1;
2199
2200
130
    for (i = 0; i < 64; i++) {
2201
128
        int j = s->idsp.idct_permutation[i];
2202
128
        v = ff_mpeg1_default_intra_matrix[i];
2203
128
        s->intra_matrix[j]        = v;
2204
128
        s->chroma_intra_matrix[j] = v;
2205
2206
128
        v = ff_mpeg1_default_non_intra_matrix[i];
2207
128
        s->inter_matrix[j]        = v;
2208
128
        s->chroma_inter_matrix[j] = v;
2209
    }
2210
2211
2
    s->progressive_sequence  = 1;
2212
2
    s->progressive_frame     = 1;
2213
2
    s->picture_structure     = PICT_FRAME;
2214
2
    s->first_field           = 0;
2215
2
    s->frame_pred_frame_dct  = 1;
2216
2
    s->chroma_format         = 1;
2217
2
    if (s->codec_tag == AV_RL32("BW10")) {
2218
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2219
    } else {
2220
2
        s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2221
2
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2222
    }
2223
2
    s1->save_width           = s->width;
2224
2
    s1->save_height          = s->height;
2225
2
    s1->save_progressive_seq = s->progressive_sequence;
2226
2
    return 0;
2227
}
2228
2229
525
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2230
                              const uint8_t *p, int buf_size)
2231
{
2232
525
    Mpeg1Context *s1 = avctx->priv_data;
2233
2234
525
    if (buf_size >= 6 &&
2235


525
        p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2236

277
        p[4] == 3 && (p[5] & 0x40)) {
2237
        /* extract A53 Part 4 CC data */
2238
277
        int cc_count = p[5] & 0x1f;
2239

277
        if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2240
277
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2241
277
            const uint64_t new_size = (old_size + cc_count
2242
277
                                            * UINT64_C(3));
2243
            int ret;
2244
2245
277
            if (new_size > 3*A53_MAX_CC_COUNT)
2246
                return AVERROR(EINVAL);
2247
2248
277
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2249
277
            if (ret >= 0)
2250
277
                memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
2251
2252
277
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2253
        }
2254
277
        return 1;
2255
248
    } else if (buf_size >= 2 &&
2256

248
               p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2257
        /* extract SCTE-20 CC data */
2258
        GetBitContext gb;
2259
205
        int cc_count = 0;
2260
        int i, ret;
2261
2262
205
        init_get_bits(&gb, p + 2, buf_size - 2);
2263
205
        cc_count = get_bits(&gb, 5);
2264
205
        if (cc_count > 0) {
2265
205
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2266
205
            const uint64_t new_size = (old_size + cc_count
2267
205
                                            * UINT64_C(3));
2268
205
            if (new_size > 3*A53_MAX_CC_COUNT)
2269
                return AVERROR(EINVAL);
2270
2271
205
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2272
205
            if (ret >= 0) {
2273
                uint8_t field, cc1, cc2;
2274
205
                uint8_t *cap = s1->a53_buf_ref->data;
2275
2276
205
                memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2277

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


43
               p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2302
        /* extract DVD CC data
2303
         *
2304
         * uint32_t   user_data_start_code        0x000001B2    (big endian)
2305
         * uint16_t   user_identifier             0x4343 "CC"
2306
         * uint8_t    user_data_type_code         0x01
2307
         * uint8_t    caption_block_size          0xF8
2308
         * uint8_t
2309
         *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2310
         *   bit 6    caption_filler              0
2311
         *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2312
         *   bit 0    caption_extra_field_added   1=one additional caption word
2313
         *
2314
         * struct caption_field_block {
2315
         *   uint8_t
2316
         *     bit 7:1 caption_filler             0x7F (all 1s)
2317
         *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2318
         *   uint8_t   caption_first_byte
2319
         *   uint8_t   caption_second_byte
2320
         * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2321
         *
2322
         * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2323
         * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2324
         * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2325
         * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2326
         * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2327
        int cc_count = 0;
2328
        int i, ret;
2329
        // There is a caption count field in the data, but it is often
2330
        // incorrect.  So count the number of captions present.
2331
        for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2332
            cc_count++;
2333
        // Transform the DVD format into A53 Part 4 format
2334
        if (cc_count > 0) {
2335
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2336
            const uint64_t new_size = (old_size + cc_count
2337
                                            * UINT64_C(6));
2338
            if (new_size > 3*A53_MAX_CC_COUNT)
2339
                return AVERROR(EINVAL);
2340
2341
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2342
            if (ret >= 0) {
2343
                uint8_t field1 = !!(p[4] & 0x80);
2344
                uint8_t *cap = s1->a53_buf_ref->data;
2345
                p += 5;
2346
                for (i = 0; i < cc_count; i++) {
2347
                    cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2348
                    cap[1] = p[1];
2349
                    cap[2] = p[2];
2350
                    cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2351
                    cap[4] = p[4];
2352
                    cap[5] = p[5];
2353
                    cap += 6;
2354
                    p += 6;
2355
                }
2356
            }
2357
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2358
        }
2359
        return 1;
2360
    }
2361
43
    return 0;
2362
}
2363
2364
732
static void mpeg_decode_user_data(AVCodecContext *avctx,
2365
                                  const uint8_t *p, int buf_size)
2366
{
2367
732
    Mpeg1Context *s = avctx->priv_data;
2368
732
    const uint8_t *buf_end = p + buf_size;
2369
732
    Mpeg1Context *s1 = avctx->priv_data;
2370
2371
#if 0
2372
    int i;
2373
    for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2374
        av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2375
    }
2376
    av_log(avctx, AV_LOG_ERROR, "\n");
2377
#endif
2378
2379
732
    if (buf_size > 29){
2380
        int i;
2381
15372
        for(i=0; i<20; i++)
2382
14640
            if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2383
                s->tmpgexs= 1;
2384
            }
2385
    }
2386
    /* we parse the DTG active format information */
2387
732
    if (buf_end - p >= 5 &&
2388


939
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2389
207
        int flags = p[4];
2390
207
        p += 5;
2391
207
        if (flags & 0x80) {
2392
            /* skip event id */
2393
            p += 2;
2394
        }
2395
207
        if (flags & 0x40) {
2396
207
            if (buf_end - p < 1)
2397
                return;
2398
207
            s1->has_afd = 1;
2399
207
            s1->afd     = p[0] & 0x0f;
2400
        }
2401
525
    } else if (buf_end - p >= 6 &&
2402


525
               p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2403
               p[4] == 0x03) { // S3D_video_format_length
2404
        // the 0x7F mask ignores the reserved_bit value
2405
        const uint8_t S3D_video_format_type = p[5] & 0x7F;
2406
2407
        if (S3D_video_format_type == 0x03 ||
2408
            S3D_video_format_type == 0x04 ||
2409
            S3D_video_format_type == 0x08 ||
2410
            S3D_video_format_type == 0x23) {
2411
2412
            s1->has_stereo3d = 1;
2413
2414
            switch (S3D_video_format_type) {
2415
            case 0x03:
2416
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2417
                break;
2418
            case 0x04:
2419
                s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2420
                break;
2421
            case 0x08:
2422
                s1->stereo3d.type = AV_STEREO3D_2D;
2423
                break;
2424
            case 0x23:
2425
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2426
                break;
2427
            }
2428
        }
2429
525
    } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2430
482
        return;
2431
    }
2432
}
2433
2434
513
static void mpeg_decode_gop(AVCodecContext *avctx,
2435
                            const uint8_t *buf, int buf_size)
2436
{
2437
513
    Mpeg1Context *s1  = avctx->priv_data;
2438
513
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2439
    int broken_link;
2440
    int64_t tc;
2441
2442
513
    init_get_bits(&s->gb, buf, buf_size * 8);
2443
2444
513
    tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2445
2446
#if FF_API_PRIVATE_OPT
2447
FF_DISABLE_DEPRECATION_WARNINGS
2448
513
    avctx->timecode_frame_start = tc;
2449
FF_ENABLE_DEPRECATION_WARNINGS
2450
#endif
2451
2452
513
    s->closed_gop = get_bits1(&s->gb);
2453
    /* broken_link indicates that after editing the
2454
     * reference frames of the first B-Frames after GOP I-Frame
2455
     * are missing (open gop) */
2456
513
    broken_link = get_bits1(&s->gb);
2457
2458
513
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2459
        char tcbuf[AV_TIMECODE_STR_SIZE];
2460
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
2461
        av_log(s->avctx, AV_LOG_DEBUG,
2462
               "GOP (%s) closed_gop=%d broken_link=%d\n",
2463
               tcbuf, s->closed_gop, broken_link);
2464
    }
2465
513
}
2466
2467
4141
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2468
                         int *got_output, const uint8_t *buf, int buf_size)
2469
{
2470
4141
    Mpeg1Context *s = avctx->priv_data;
2471
4141
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2472
4141
    const uint8_t *buf_ptr = buf;
2473
4141
    const uint8_t *buf_end = buf + buf_size;
2474
    int ret, input_size;
2475
4141
    int last_code = 0, skip_frame = 0;
2476
4141
    int picture_start_code_seen = 0;
2477
2478
199014
    for (;;) {
2479
        /* find next start code */
2480
203155
        uint32_t start_code = -1;
2481
203155
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2482
203155
        if (start_code > 0x1ff) {
2483
4019
            if (!skip_frame) {
2484
3747
                if (HAVE_THREADS &&
2485
3747
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2486
475
                    !avctx->hwaccel) {
2487
                    int i;
2488
475
                    av_assert0(avctx->thread_count > 1);
2489
2490
475
                    avctx->execute(avctx, slice_decode_thread,
2491
475
                                   &s2->thread_context[0], NULL,
2492
                                   s->slice_count, sizeof(void *));
2493
4723
                    for (i = 0; i < s->slice_count; i++)
2494
4248
                        s2->er.error_count += s2->thread_context[i]->er.error_count;
2495
                }
2496
2497
3747
                ret = slice_end(avctx, picture);
2498
3747
                if (ret < 0)
2499
4141
                    return ret;
2500
3747
                else if (ret) {
2501
                    // FIXME: merge with the stuff in mpeg_decode_slice
2502

3487
                    if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2503
3428
                        *got_output = 1;
2504
                }
2505
            }
2506
4019
            s2->pict_type = 0;
2507
2508

4019
            if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2509
                return AVERROR_INVALIDDATA;
2510
2511
4019
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2512
        }
2513
2514
199136
        input_size = buf_end - buf_ptr;
2515
2516
199136
        if (avctx->debug & FF_DEBUG_STARTCODE)
2517
            av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2518
                   start_code, buf_ptr - buf, input_size);
2519
2520
        /* prepare data for next start code */
2521

199136
        switch (start_code) {
2522
741
        case SEQ_START_CODE:
2523
741
            if (last_code == 0) {
2524
741
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2525
741
                if (buf != avctx->extradata)
2526
504
                    s->sync = 1;
2527
            } else {
2528
                av_log(avctx, AV_LOG_ERROR,
2529
                       "ignoring SEQ_START_CODE after %X\n", last_code);
2530
                if (avctx->err_recognition & AV_EF_EXPLODE)
2531
                    return AVERROR_INVALIDDATA;
2532
            }
2533
741
            break;
2534
2535
4576
        case PICTURE_START_CODE:
2536

4576
            if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2537
               /* If it's a frame picture, there can't be more than one picture header.
2538
                  Yet, it does happen and we need to handle it. */
2539
               av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2540
               break;
2541
            }
2542
4576
            picture_start_code_seen = 1;
2543
2544

4576
            if (s2->width <= 0 || s2->height <= 0) {
2545
122
                av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2546
                       s2->width, s2->height);
2547
122
                return AVERROR_INVALIDDATA;
2548
            }
2549
2550
4454
            if (s->tmpgexs){
2551
                s2->intra_dc_precision= 3;
2552
                s2->intra_matrix[0]= 1;
2553
            }
2554
4454
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2555

478
                !avctx->hwaccel && s->slice_count) {
2556
                int i;
2557
2558
                avctx->execute(avctx, slice_decode_thread,
2559
                               s2->thread_context, NULL,
2560
                               s->slice_count, sizeof(void *));
2561
                for (i = 0; i < s->slice_count; i++)
2562
                    s2->er.error_count += s2->thread_context[i]->er.error_count;
2563
                s->slice_count = 0;
2564
            }
2565

4454
            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2566
4454
                ret = mpeg_decode_postinit(avctx);
2567
4454
                if (ret < 0) {
2568
                    av_log(avctx, AV_LOG_ERROR,
2569
                           "mpeg_decode_postinit() failure\n");
2570
                    return ret;
2571
                }
2572
2573
                /* We have a complete image: we try to decompress it. */
2574
4454
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2575
                    s2->pict_type = 0;
2576
4454
                s->first_slice = 1;
2577
4454
                last_code      = PICTURE_START_CODE;
2578
            } else {
2579
                av_log(avctx, AV_LOG_ERROR,
2580
                       "ignoring pic after %X\n", last_code);
2581
                if (avctx->err_recognition & AV_EF_EXPLODE)
2582
                    return AVERROR_INVALIDDATA;
2583
            }
2584
4454
            break;
2585
5377
        case EXT_START_CODE:
2586
5377
            init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2587
2588
5377
            switch (get_bits(&s2->gb, 4)) {
2589
649
            case 0x1:
2590
649
                if (last_code == 0) {
2591
649
                    mpeg_decode_sequence_extension(s);
2592
                } else {
2593
                    av_log(avctx, AV_LOG_ERROR,
2594
                           "ignoring seq ext after %X\n", last_code);
2595
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2596
                        return AVERROR_INVALIDDATA;
2597
                }
2598
649
                break;
2599
61
            case 0x2:
2600
61
                mpeg_decode_sequence_display_extension(s);
2601
61
                break;
2602
692
            case 0x3:
2603
692
                mpeg_decode_quant_matrix_extension(s2);
2604
692
                break;
2605
15
            case 0x7:
2606
15
                mpeg_decode_picture_display_extension(s);
2607
15
                break;
2608
3960
            case 0x8:
2609
3960
                if (last_code == PICTURE_START_CODE) {
2610
3960
                    mpeg_decode_picture_coding_extension(s);
2611
                } else {
2612
                    av_log(avctx, AV_LOG_ERROR,
2613
                           "ignoring pic cod ext after %X\n", last_code);
2614
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2615
                        return AVERROR_INVALIDDATA;
2616
                }
2617
3960
                break;
2618
            }
2619
5377
            break;
2620
732
        case USER_START_CODE:
2621
732
            mpeg_decode_user_data(avctx, buf_ptr, input_size);
2622
732
            break;
2623
513
        case GOP_START_CODE:
2624
513
            if (last_code == 0) {
2625
513
                s2->first_field = 0;
2626
513
                mpeg_decode_gop(avctx, buf_ptr, input_size);
2627
513
                s->sync = 1;
2628
            } else {
2629
                av_log(avctx, AV_LOG_ERROR,
2630
                       "ignoring GOP_START_CODE after %X\n", last_code);
2631
                if (avctx->err_recognition & AV_EF_EXPLODE)
2632
                    return AVERROR_INVALIDDATA;
2633
            }
2634
513
            break;
2635
187197
        default:
2636
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2637

186651
                start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2638

4454
                if (s2->progressive_sequence && !s2->progressive_frame) {
2639
                    s2->progressive_frame = 1;
2640
                    av_log(s2->avctx, AV_LOG_ERROR,
2641
                           "interlaced frame in progressive sequence, ignoring\n");
2642
                }
2643
2644
4454
                if (s2->picture_structure == 0 ||
2645

4454
                    (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2646
                    av_log(s2->avctx, AV_LOG_ERROR,
2647
                           "picture_structure %d invalid, ignoring\n",
2648
                           s2->picture_structure);
2649
                    s2->picture_structure = PICT_FRAME;
2650
                }
2651
2652

4454
                if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2653
                    av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2654
2655
4454
                if (s2->picture_structure == PICT_FRAME) {
2656
3064
                    s2->first_field = 0;
2657
3064
                    s2->v_edge_pos  = 16 * s2->mb_height;
2658
                } else {
2659
1390
                    s2->first_field ^= 1;
2660
1390
                    s2->v_edge_pos   = 8 * s2->mb_height;
2661
1390
                    memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2662
                }
2663
            }
2664
187197
            if (start_code >= SLICE_MIN_START_CODE &&
2665

186651
                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2666
186507
                const int field_pic = s2->picture_structure != PICT_FRAME;
2667
186507
                int mb_y = start_code - SLICE_MIN_START_CODE;
2668
186507
                last_code = SLICE_MIN_START_CODE;
2669

186507
                if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2670
                    mb_y += (*buf_ptr&0xE0)<<2;
2671
2672
186507
                mb_y <<= field_pic;
2673
186507
                if (s2->picture_structure == PICT_BOTTOM_FIELD)
2674
10341
                    mb_y++;
2675
2676
186507
                if (buf_end - buf_ptr < 2) {
2677
                    av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2678
                    return AVERROR_INVALIDDATA;
2679
                }
2680
2681
186507
                if (mb_y >= s2->mb_height) {
2682
                    av_log(s2->avctx, AV_LOG_ERROR,
2683
                           "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2684
                    return AVERROR_INVALIDDATA;
2685
                }
2686
2687
186507
                if (!s2->last_picture_ptr) {
2688
                    /* Skip B-frames if we do not have reference frames and
2689
                     * GOP is not closed. */
2690
78806
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2691
612
                        if (!s2->closed_gop) {
2692
612
                            skip_frame = 1;
2693
612
                            av_log(s2->avctx, AV_LOG_DEBUG,
2694
                                   "Skipping B slice due to open GOP\n");
2695
612
                            break;
2696
                        }
2697
                    }
2698
                }
2699

185895
                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2700
120936
                    s->sync = 1;
2701
185895
                if (!s2->next_picture_ptr) {
2702
                    /* Skip P-frames if we do not have a reference frame or
2703
                     * we have an invalid header. */
2704

74630
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2705
3060
                        skip_frame = 1;
2706
3060
                        av_log(s2->avctx, AV_LOG_DEBUG,
2707
                               "Skipping P slice due to !sync\n");
2708
3060
                        break;
2709
                    }
2710
                }
2711
182835
                if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2712
71500
                     s2->pict_type == AV_PICTURE_TYPE_B) ||
2713
182835
                    (avctx->skip_frame >= AVDISCARD_NONKEY &&
2714
71500
                     s2->pict_type != AV_PICTURE_TYPE_I) ||
2715
182218
                    avctx->skip_frame >= AVDISCARD_ALL) {
2716
71500
                    skip_frame = 1;
2717
71500
                    break;
2718
                }
2719
2720
111335
                if (!s->mpeg_enc_ctx_allocated)
2721
                    break;
2722
2723
111335
                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2724
104062
                    if (mb_y < avctx->skip_top ||
2725
104062
                        mb_y >= s2->mb_height - avctx->skip_bottom)
2726
                        break;
2727
                }
2728
2729
111335
                if (!s2->pict_type) {
2730
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2731
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2732
                        return AVERROR_INVALIDDATA;
2733
                    break;
2734
                }
2735
2736
111335
                if (s->first_slice) {
2737
4089
                    skip_frame     = 0;
2738
4089
                    s->first_slice = 0;
2739
4089
                    if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2740
                        return ret;
2741
                }
2742
111335
                if (!s2->current_picture_ptr) {
2743
                    av_log(avctx, AV_LOG_ERROR,
2744
                           "current_picture not initialized\n");
2745
                    return AVERROR_INVALIDDATA;
2746
                }
2747
2748
111335
                if (HAVE_THREADS &&
2749
111335
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2750
14160
                    !avctx->hwaccel) {
2751
14160
                    int threshold = (s2->mb_height * s->slice_count +
2752
14160
                                     s2->slice_context_count / 2) /
2753
14160
                                    s2->slice_context_count;
2754
14160
                    av_assert0(avctx->thread_count > 1);
2755
14160
                    if (threshold <= mb_y) {
2756
4248
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2757
2758
4248
                        thread_context->start_mb_y = mb_y;
2759
4248
                        thread_context->end_mb_y   = s2->mb_height;
2760
4248
                        if (s->slice_count) {
2761
3776
                            s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2762
3776
                            ret = ff_update_duplicate_context(thread_context, s2);
2763
3776
                            if (ret < 0)
2764
                                return ret;
2765
                        }
2766
4248
                        init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2767
4248
                        s->slice_count++;
2768
                    }
2769
14160
                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
2770
                } else {
2771
97175
                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2772
97175
                    emms_c();
2773
2774
97175
                    if (ret < 0) {
2775
4
                        if (avctx->err_recognition & AV_EF_EXPLODE)
2776
                            return ret;
2777

4
                        if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2778
4
                            ff_er_add_slice(&s2->er, s2->resync_mb_x,
2779
                                            s2->resync_mb_y, s2->mb_x, s2->mb_y,
2780
                                            ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2781
                    } else {
2782
97171
                        ff_er_add_slice(&s2->er, s2->resync_mb_x,
2783
97171
                                        s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2784
                                        ER_AC_END | ER_DC_END | ER_MV_END);
2785
                    }
2786
                }
2787
            }
2788
112025
            break;
2789
        }
2790
    }
2791
}
2792
2793
4058
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2794
                             int *got_output, AVPacket *avpkt)
2795
{
2796
4058
    const uint8_t *buf = avpkt->data;
2797
    int ret;
2798
4058
    int buf_size = avpkt->size;
2799
4058
    Mpeg1Context *s = avctx->priv_data;
2800
4058
    AVFrame *picture = data;
2801
4058
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2802
2803

4058
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2804
        /* special case for last picture */
2805

129
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
2806
59
            int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2807
59
            if (ret < 0)
2808
                return ret;
2809
2810
59
            s2->next_picture_ptr = NULL;
2811
2812
59
            *got_output = 1;
2813
        }
2814
129
        return buf_size;
2815
    }
2816
2817
3929
    if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2818
49
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2819
                                           buf_size, NULL);
2820
2821
49
        if (ff_combine_frame(&s2->parse_context, next,
2822
                             (const uint8_t **) &buf, &buf_size) < 0)
2823
25
            return buf_size;
2824
    }
2825
2826
3904
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2827

3904
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2828
381
                                           || s2->codec_tag == AV_RL32("BW10")
2829
                                          ))
2830
2
        vcr2_init_sequence(avctx);
2831
2832
3904
    s->slice_count = 0;
2833
2834

3904
    if (avctx->extradata && !s->extradata_decoded) {
2835
237
        ret = decode_chunks(avctx, picture, got_output,
2836
237
                            avctx->extradata, avctx->extradata_size);
2837
237
        if (*got_output) {
2838
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2839
            av_frame_unref(picture);
2840
            *got_output = 0;
2841
        }
2842
237
        s->extradata_decoded = 1;
2843

237
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2844
            s2->current_picture_ptr = NULL;
2845
            return ret;
2846
        }
2847
    }
2848
2849
3904
    ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2850

3904
    if (ret<0 || *got_output) {
2851
3550
        s2->current_picture_ptr = NULL;
2852
2853

3550
        if (s2->timecode_frame_start != -1 && *got_output) {
2854
            char tcbuf[AV_TIMECODE_STR_SIZE];
2855
343
            AVFrameSideData *tcside = av_frame_new_side_data(picture,
2856
                                                             AV_FRAME_DATA_GOP_TIMECODE,
2857
                                                             sizeof(int64_t));
2858
343
            if (!tcside)
2859
                return AVERROR(ENOMEM);
2860
343
            memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2861
2862
343
            av_timecode_make_mpeg_tc_string(tcbuf, s2->timecode_frame_start);
2863
343
            av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2864
2865
343
            s2->timecode_frame_start = -1;
2866
        }
2867
    }
2868
2869
3904
    return ret;
2870
}
2871
2872
static void flush(AVCodecContext *avctx)
2873
{
2874
    Mpeg1Context *s = avctx->priv_data;
2875
2876
    s->sync       = 0;
2877
2878
    ff_mpeg_flush(avctx);
2879
}
2880
2881
255
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2882
{
2883
255
    Mpeg1Context *s = avctx->priv_data;
2884
2885
255
    ff_mpv_common_end(&s->mpeg_enc_ctx);
2886
255
    av_buffer_unref(&s->a53_buf_ref);
2887
255
    return 0;
2888
}
2889
2890
AVCodec ff_mpeg1video_decoder = {
2891
    .name                  = "mpeg1video",
2892
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2893
    .type                  = AVMEDIA_TYPE_VIDEO,
2894
    .id                    = AV_CODEC_ID_MPEG1VIDEO,
2895
    .priv_data_size        = sizeof(Mpeg1Context),
2896
    .init                  = mpeg_decode_init,
2897
    .close                 = mpeg_decode_end,
2898
    .decode                = mpeg_decode_frame,
2899
    .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2900
                             AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2901
                             AV_CODEC_CAP_SLICE_THREADS,
2902
    .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2903
    .flush                 = flush,
2904
    .max_lowres            = 3,
2905
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2906
    .hw_configs            = (const AVCodecHWConfigInternal*[]) {
2907
#if CONFIG_MPEG1_NVDEC_HWACCEL
2908
                               HWACCEL_NVDEC(mpeg1),
2909
#endif
2910
#if CONFIG_MPEG1_VDPAU_HWACCEL
2911
                               HWACCEL_VDPAU(mpeg1),
2912
#endif
2913
#if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2914
                               HWACCEL_VIDEOTOOLBOX(mpeg1),
2915
#endif
2916
#if CONFIG_MPEG1_XVMC_HWACCEL
2917
                               HWACCEL_XVMC(mpeg1),
2918
#endif
2919
                               NULL
2920
                           },
2921
};
2922
2923
AVCodec ff_mpeg2video_decoder = {
2924
    .name           = "mpeg2video",
2925
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2926
    .type           = AVMEDIA_TYPE_VIDEO,
2927
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2928
    .priv_data_size = sizeof(Mpeg1Context),
2929
    .init           = mpeg_decode_init,
2930
    .close          = mpeg_decode_end,
2931
    .decode         = mpeg_decode_frame,
2932
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2933
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2934
                      AV_CODEC_CAP_SLICE_THREADS,
2935
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2936
    .flush          = flush,
2937
    .max_lowres     = 3,
2938
    .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2939
    .hw_configs     = (const AVCodecHWConfigInternal*[]) {
2940
#if CONFIG_MPEG2_DXVA2_HWACCEL
2941
                        HWACCEL_DXVA2(mpeg2),
2942
#endif
2943
#if CONFIG_MPEG2_D3D11VA_HWACCEL
2944
                        HWACCEL_D3D11VA(mpeg2),
2945
#endif
2946
#if CONFIG_MPEG2_D3D11VA2_HWACCEL
2947
                        HWACCEL_D3D11VA2(mpeg2),
2948
#endif
2949
#if CONFIG_MPEG2_NVDEC_HWACCEL
2950
                        HWACCEL_NVDEC(mpeg2),
2951
#endif
2952
#if CONFIG_MPEG2_VAAPI_HWACCEL
2953
                        HWACCEL_VAAPI(mpeg2),
2954
#endif
2955
#if CONFIG_MPEG2_VDPAU_HWACCEL
2956
                        HWACCEL_VDPAU(mpeg2),
2957
#endif
2958
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
2959
                        HWACCEL_VIDEOTOOLBOX(mpeg2),
2960
#endif
2961
#if CONFIG_MPEG2_XVMC_HWACCEL
2962
                        HWACCEL_XVMC(mpeg2),
2963
#endif
2964
                        NULL
2965
                    },
2966
};
2967
2968
//legacy decoder
2969
AVCodec ff_mpegvideo_decoder = {
2970
    .name           = "mpegvideo",
2971
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2972
    .type           = AVMEDIA_TYPE_VIDEO,
2973
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2974
    .priv_data_size = sizeof(Mpeg1Context),
2975
    .init           = mpeg_decode_init,
2976
    .close          = mpeg_decode_end,
2977
    .decode         = mpeg_decode_frame,
2978
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
2979
    .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_CLEANUP,
2980
    .flush          = flush,
2981
    .max_lowres     = 3,
2982
};
2983
2984
typedef struct IPUContext {
2985
    MpegEncContext m;
2986
2987
    int flags;
2988
    DECLARE_ALIGNED(32, int16_t, block)[6][64];
2989
} IPUContext;
2990
2991
static int ipu_decode_frame(AVCodecContext *avctx, void *data,
2992
                            int *got_frame, AVPacket *avpkt)
2993
{
2994
    IPUContext *s = avctx->priv_data;
2995
    MpegEncContext *m = &s->m;
2996
    GetBitContext *gb = &m->gb;
2997
    AVFrame * const frame = data;
2998
    int ret;
2999
3000
    ret = ff_get_buffer(avctx, frame, 0);
3001
    if (ret < 0)
3002
        return ret;
3003
3004
    ret = init_get_bits8(gb, avpkt->data, avpkt->size);
3005
    if (ret < 0)
3006
        return ret;
3007
3008
    s->flags = get_bits(gb, 8);
3009
    m->intra_dc_precision = s->flags & 3;
3010
    m->q_scale_type = !!(s->flags & 0x40);
3011
    m->intra_vlc_format = !!(s->flags & 0x20);
3012
    m->alternate_scan = !!(s->flags & 0x10);
3013
3014
    if (s->flags & 0x10) {
3015
        ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_alternate_vertical_scan);
3016
        ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_alternate_vertical_scan);
3017
    } else {
3018
        ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_zigzag_direct);
3019
        ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_zigzag_direct);
3020
    }
3021
3022
    m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
3023
    m->qscale = 1;
3024
3025
    for (int y = 0; y < avctx->height; y += 16) {
3026
        int intraquant;
3027
3028
        for (int x = 0; x < avctx->width; x += 16) {
3029
            if (x || y) {
3030
                if (!get_bits1(gb))
3031
                    return AVERROR_INVALIDDATA;
3032
            }
3033
            if (get_bits1(gb)) {
3034
                intraquant = 0;
3035
            } else {
3036
                if (!get_bits1(gb))
3037
                    return AVERROR_INVALIDDATA;
3038
                intraquant = 1;
3039
            }
3040
3041
            if (s->flags & 4)
3042
                skip_bits1(gb);
3043
3044
            if (intraquant)
3045
                m->qscale = mpeg_get_qscale(m);
3046
3047
            memset(s->block, 0, sizeof(s->block));
3048
3049
            for (int n = 0; n < 6; n++) {
3050
                if (s->flags & 0x80) {
3051
                    ret = ff_mpeg1_decode_block_intra(&m->gb,
3052
                                                      m->intra_matrix,
3053
                                                      m->intra_scantable.permutated,
3054
                                                      m->last_dc, s->block[n],
3055
                                                      n, m->qscale);
3056
                    if (ret >= 0)
3057
                        m->block_last_index[n] = ret;
3058
                } else {
3059
                    ret = mpeg2_decode_block_intra(m, s->block[n], n);
3060
                }
3061
3062
                if (ret < 0)
3063
                    return ret;
3064
            }
3065
3066
            m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
3067
                             frame->linesize[0], s->block[0]);
3068
            m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
3069
                             frame->linesize[0], s->block[1]);
3070
            m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
3071
                             frame->linesize[0], s->block[2]);
3072
            m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
3073
                             frame->linesize[0], s->block[3]);
3074
            m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
3075
                             frame->linesize[1], s->block[4]);
3076
            m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
3077
                             frame->linesize[2], s->block[5]);
3078
        }
3079
    }
3080
3081
    align_get_bits(gb);
3082
    if (get_bits_left(gb) != 32)
3083
        return AVERROR_INVALIDDATA;
3084
3085
    frame->pict_type = AV_PICTURE_TYPE_I;
3086
    frame->key_frame = 1;
3087
    *got_frame = 1;
3088
3089
    return avpkt->size;
3090
}
3091
3092
static av_cold int ipu_decode_init(AVCodecContext *avctx)
3093
{
3094
    IPUContext *s = avctx->priv_data;
3095
    MpegEncContext *m = &s->m;
3096
3097
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
3098
3099
    ff_mpv_decode_defaults(m);
3100
    ff_mpv_decode_init(m, avctx);
3101
    s->m.avctx = avctx;
3102
    ff_mpv_idct_init(m);
3103
    ff_mpeg12_common_init(m);
3104
    ff_mpeg12_init_vlcs();
3105
3106
    for (int i = 0; i < 64; i++) {
3107
        int j = m->idsp.idct_permutation[i];
3108
        int v = ff_mpeg1_default_intra_matrix[i];
3109
        m->intra_matrix[j]        = v;
3110
        m->chroma_intra_matrix[j] = v;
3111
    }
3112
3113
    for (int i = 0; i < 64; i++) {
3114
        int j = m->idsp.idct_permutation[i];
3115
        int v = ff_mpeg1_default_non_intra_matrix[i];
3116
        m->inter_matrix[j]        = v;
3117
        m->chroma_inter_matrix[j] = v;
3118
    }
3119
3120
    return 0;
3121
}
3122
3123
static av_cold int ipu_decode_end(AVCodecContext *avctx)
3124
{
3125
    IPUContext *s = avctx->priv_data;
3126
3127
    ff_mpv_common_end(&s->m);
3128
3129
    return 0;
3130
}
3131
3132
AVCodec ff_ipu_decoder = {
3133
    .name           = "ipu",
3134
    .long_name      = NULL_IF_CONFIG_SMALL("IPU Video"),
3135
    .type           = AVMEDIA_TYPE_VIDEO,
3136
    .id             = AV_CODEC_ID_IPU,
3137
    .priv_data_size = sizeof(IPUContext),
3138
    .init           = ipu_decode_init,
3139
    .decode         = ipu_decode_frame,
3140
    .close          = ipu_decode_end,
3141
    .capabilities   = AV_CODEC_CAP_DR1,
3142
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
3143
};