GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpeg12dec.c Lines: 1173 1756 66.8 %
Date: 2021-04-20 04:37:23 Branches: 645 1145 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/mem_internal.h"
35
#include "libavutil/stereo3d.h"
36
#include "libavutil/video_enc_params.h"
37
38
#include "avcodec.h"
39
#include "bytestream.h"
40
#include "error_resilience.h"
41
#include "hwconfig.h"
42
#include "idctdsp.h"
43
#include "internal.h"
44
#include "mpeg_er.h"
45
#include "mpeg12.h"
46
#include "mpeg12data.h"
47
#include "mpegutils.h"
48
#include "mpegvideo.h"
49
#include "mpegvideodata.h"
50
#include "profiles.h"
51
#include "thread.h"
52
#include "version.h"
53
#include "xvmc_internal.h"
54
55
#define A53_MAX_CC_COUNT 2000
56
57
typedef struct Mpeg1Context {
58
    MpegEncContext mpeg_enc_ctx;
59
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
60
    int repeat_field;           /* true if we must repeat the field */
61
    AVPanScan pan_scan;         /* some temporary storage for the panscan */
62
    AVStereo3D stereo3d;
63
    int has_stereo3d;
64
    AVBufferRef *a53_buf_ref;
65
    uint8_t afd;
66
    int has_afd;
67
    int slice_count;
68
    AVRational save_aspect;
69
    int save_width, save_height, save_progressive_seq;
70
    int rc_buffer_size;
71
    AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
72
    int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
73
    int tmpgexs;
74
    int first_slice;
75
    int extradata_decoded;
76
} Mpeg1Context;
77
78
#define MB_TYPE_ZERO_MV   0x20000000
79
80
static const uint32_t ptype2mb_type[7] = {
81
                    MB_TYPE_INTRA,
82
                    MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
83
                    MB_TYPE_L0,
84
                    MB_TYPE_L0 | MB_TYPE_CBP,
85
    MB_TYPE_QUANT | MB_TYPE_INTRA,
86
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
87
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
88
};
89
90
static const uint32_t btype2mb_type[11] = {
91
                    MB_TYPE_INTRA,
92
                    MB_TYPE_L1,
93
                    MB_TYPE_L1   | MB_TYPE_CBP,
94
                    MB_TYPE_L0,
95
                    MB_TYPE_L0   | MB_TYPE_CBP,
96
                    MB_TYPE_L0L1,
97
                    MB_TYPE_L0L1 | MB_TYPE_CBP,
98
    MB_TYPE_QUANT | MB_TYPE_INTRA,
99
    MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
100
    MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
101
    MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
102
};
103
104
/* as H.263, but only 17 codes */
105
4129656
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
106
{
107
    int code, sign, val, shift;
108
109
4129656
    code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
110
4129656
    if (code == 0)
111
1684185
        return pred;
112
2445471
    if (code < 0)
113
        return 0xffff;
114
115
2445471
    sign  = get_bits1(&s->gb);
116
2445471
    shift = fcode - 1;
117
2445471
    val   = code;
118
2445471
    if (shift) {
119
2103529
        val  = (val - 1) << shift;
120
2103529
        val |= get_bits(&s->gb, shift);
121
2103529
        val++;
122
    }
123
2445471
    if (sign)
124
1265834
        val = -val;
125
2445471
    val += pred;
126
127
    /* modulo decoding */
128
2445471
    return sign_extend(val, 5 + shift);
129
}
130
131
#define MAX_INDEX (64 - 1)
132
#define check_scantable_index(ctx, x)                                         \
133
    do {                                                                      \
134
        if ((x) > MAX_INDEX) {                                                \
135
            av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
136
                   ctx->mb_x, ctx->mb_y);                                     \
137
            return AVERROR_INVALIDDATA;                                       \
138
        }                                                                     \
139
    } while (0)
140
141
403118
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
142
                                           int16_t *block, int n)
143
{
144
    int level, i, j, run;
145
403118
    RLTable *rl                  = &ff_rl_mpeg1;
146
403118
    uint8_t *const scantable     = s->intra_scantable.permutated;
147
403118
    const uint16_t *quant_matrix = s->inter_matrix;
148
403118
    const int qscale             = s->qscale;
149
150
    {
151
403118
        OPEN_READER(re, &s->gb);
152
403118
        i = -1;
153
        // special case for first coefficient, no need to add second VLC table
154
403118
        UPDATE_CACHE(re, &s->gb);
155
403118
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
156
101724
            level = (3 * qscale * quant_matrix[0]) >> 5;
157
101724
            level = (level - 1) | 1;
158
101724
            if (GET_CACHE(re, &s->gb) & 0x40000000)
159
56898
                level = -level;
160
101724
            block[0] = level;
161
101724
            i++;
162
101724
            SKIP_BITS(re, &s->gb, 2);
163
101724
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
164
34285
                goto end;
165
        }
166
        /* now quantify & encode AC coefficients */
167
        for (;;) {
168
2921408
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
169
                       TEX_VLC_BITS, 2, 0);
170
171
2921408
            if (level != 0) {
172
2842322
                i += run;
173
2842322
                if (i > MAX_INDEX)
174
                    break;
175
2842322
                j = scantable[i];
176
2842322
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
177
2842322
                level = (level - 1) | 1;
178
2842322
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
179
2842322
                        SHOW_SBITS(re, &s->gb, 1);
180
2842322
                SKIP_BITS(re, &s->gb, 1);
181
            } else {
182
                /* escape */
183
79086
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
184
79086
                LAST_SKIP_BITS(re, &s->gb, 6);
185
79086
                UPDATE_CACHE(re, &s->gb);
186
79086
                level = SHOW_SBITS(re, &s->gb, 8);
187
79086
                SKIP_BITS(re, &s->gb, 8);
188
79086
                if (level == -128) {
189
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
190
                    SKIP_BITS(re, &s->gb, 8);
191
79086
                } else if (level == 0) {
192
                    level = SHOW_UBITS(re, &s->gb, 8);
193
                    SKIP_BITS(re, &s->gb, 8);
194
                }
195
79086
                i += run;
196
79086
                if (i > MAX_INDEX)
197
                    break;
198
79086
                j = scantable[i];
199
79086
                if (level < 0) {
200
38919
                    level = -level;
201
38919
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
202
38919
                    level = (level - 1) | 1;
203
38919
                    level = -level;
204
                } else {
205
40167
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
206
40167
                    level = (level - 1) | 1;
207
                }
208
            }
209
210
2921408
            block[j] = level;
211
2921408
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
212
368833
                break;
213
2552575
            UPDATE_CACHE(re, &s->gb);
214
        }
215
403118
end:
216
403118
        LAST_SKIP_BITS(re, &s->gb, 2);
217
403118
        CLOSE_READER(re, &s->gb);
218
    }
219
220
403118
    check_scantable_index(s, i);
221
222
403118
    s->block_last_index[n] = i;
223
403118
    return 0;
224
}
225
226
/**
227
 * Changing this would eat up any speed benefits it has.
228
 * Do not use "fast" flag if you need the code to be robust.
229
 */
230
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
231
                                                int16_t *block, int n)
232
{
233
    int level, i, j, run;
234
    RLTable *rl              = &ff_rl_mpeg1;
235
    uint8_t *const scantable = s->intra_scantable.permutated;
236
    const int qscale         = s->qscale;
237
238
    {
239
        OPEN_READER(re, &s->gb);
240
        i = -1;
241
        // Special case for first coefficient, no need to add second VLC table.
242
        UPDATE_CACHE(re, &s->gb);
243
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
244
            level = (3 * qscale) >> 1;
245
            level = (level - 1) | 1;
246
            if (GET_CACHE(re, &s->gb) & 0x40000000)
247
                level = -level;
248
            block[0] = level;
249
            i++;
250
            SKIP_BITS(re, &s->gb, 2);
251
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
252
                goto end;
253
        }
254
255
        /* now quantify & encode AC coefficients */
256
        for (;;) {
257
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
258
                       TEX_VLC_BITS, 2, 0);
259
260
            if (level != 0) {
261
                i += run;
262
                if (i > MAX_INDEX)
263
                    break;
264
                j = scantable[i];
265
                level = ((level * 2 + 1) * qscale) >> 1;
266
                level = (level - 1) | 1;
267
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
268
                        SHOW_SBITS(re, &s->gb, 1);
269
                SKIP_BITS(re, &s->gb, 1);
270
            } else {
271
                /* escape */
272
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
273
                LAST_SKIP_BITS(re, &s->gb, 6);
274
                UPDATE_CACHE(re, &s->gb);
275
                level = SHOW_SBITS(re, &s->gb, 8);
276
                SKIP_BITS(re, &s->gb, 8);
277
                if (level == -128) {
278
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
279
                    SKIP_BITS(re, &s->gb, 8);
280
                } else if (level == 0) {
281
                    level = SHOW_UBITS(re, &s->gb, 8);
282
                    SKIP_BITS(re, &s->gb, 8);
283
                }
284
                i += run;
285
                if (i > MAX_INDEX)
286
                    break;
287
                j = scantable[i];
288
                if (level < 0) {
289
                    level = -level;
290
                    level = ((level * 2 + 1) * qscale) >> 1;
291
                    level = (level - 1) | 1;
292
                    level = -level;
293
                } else {
294
                    level = ((level * 2 + 1) * qscale) >> 1;
295
                    level = (level - 1) | 1;
296
                }
297
            }
298
299
            block[j] = level;
300
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
301
                break;
302
            UPDATE_CACHE(re, &s->gb);
303
        }
304
end:
305
        LAST_SKIP_BITS(re, &s->gb, 2);
306
        CLOSE_READER(re, &s->gb);
307
    }
308
309
    check_scantable_index(s, i);
310
311
    s->block_last_index[n] = i;
312
    return 0;
313
}
314
315
3807658
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
316
                                               int16_t *block, int n)
317
{
318
    int level, i, j, run;
319
3807658
    RLTable *rl = &ff_rl_mpeg1;
320
3807658
    uint8_t *const scantable = s->intra_scantable.permutated;
321
    const uint16_t *quant_matrix;
322
3807658
    const int qscale = s->qscale;
323
    int mismatch;
324
325
3807658
    mismatch = 1;
326
327
    {
328
3807658
        OPEN_READER(re, &s->gb);
329
3807658
        i = -1;
330
3807658
        if (n < 4)
331
2868315
            quant_matrix = s->inter_matrix;
332
        else
333
939343
            quant_matrix = s->chroma_inter_matrix;
334
335
        // Special case for first coefficient, no need to add second VLC table.
336
3807658
        UPDATE_CACHE(re, &s->gb);
337
3807658
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
338
1330950
            level = (3 * qscale * quant_matrix[0]) >> 5;
339
1330950
            if (GET_CACHE(re, &s->gb) & 0x40000000)
340
834321
                level = -level;
341
1330950
            block[0]  = level;
342
1330950
            mismatch ^= level;
343
1330950
            i++;
344
1330950
            SKIP_BITS(re, &s->gb, 2);
345
1330950
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
346
604081
                goto end;
347
        }
348
349
        /* now quantify & encode AC coefficients */
350
        for (;;) {
351
15255123
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
352
                       TEX_VLC_BITS, 2, 0);
353
354
15255123
            if (level != 0) {
355
15003427
                i += run;
356
15003427
                if (i > MAX_INDEX)
357
                    break;
358
15003427
                j = scantable[i];
359
15003427
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
360
15003427
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
361
15003427
                        SHOW_SBITS(re, &s->gb, 1);
362
15003427
                SKIP_BITS(re, &s->gb, 1);
363
            } else {
364
                /* escape */
365
251696
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
366
251696
                LAST_SKIP_BITS(re, &s->gb, 6);
367
251696
                UPDATE_CACHE(re, &s->gb);
368
251696
                level = SHOW_SBITS(re, &s->gb, 12);
369
251696
                SKIP_BITS(re, &s->gb, 12);
370
371
251696
                i += run;
372
251696
                if (i > MAX_INDEX)
373
                    break;
374
251696
                j = scantable[i];
375
251696
                if (level < 0) {
376
122825
                    level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
377
122825
                    level = -level;
378
                } else {
379
128871
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
380
                }
381
            }
382
383
15255123
            mismatch ^= level;
384
15255123
            block[j]  = level;
385
15255123
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
386
3203577
                break;
387
12051546
            UPDATE_CACHE(re, &s->gb);
388
        }
389
3807658
end:
390
3807658
        LAST_SKIP_BITS(re, &s->gb, 2);
391
3807658
        CLOSE_READER(re, &s->gb);
392
    }
393
3807658
    block[63] ^= (mismatch & 1);
394
395
3807658
    check_scantable_index(s, i);
396
397
3807658
    s->block_last_index[n] = i;
398
3807658
    return 0;
399
}
400
401
/**
402
 * Changing this would eat up any speed benefits it has.
403
 * Do not use "fast" flag if you need the code to be robust.
404
 */
405
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
406
                                                    int16_t *block, int n)
407
{
408
    int level, i, j, run;
409
    RLTable *rl              = &ff_rl_mpeg1;
410
    uint8_t *const scantable = s->intra_scantable.permutated;
411
    const int qscale         = s->qscale;
412
    OPEN_READER(re, &s->gb);
413
    i = -1;
414
415
    // special case for first coefficient, no need to add second VLC table
416
    UPDATE_CACHE(re, &s->gb);
417
    if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
418
        level = (3 * qscale) >> 1;
419
        if (GET_CACHE(re, &s->gb) & 0x40000000)
420
            level = -level;
421
        block[0] = level;
422
        i++;
423
        SKIP_BITS(re, &s->gb, 2);
424
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
425
            goto end;
426
    }
427
428
    /* now quantify & encode AC coefficients */
429
    for (;;) {
430
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
431
432
        if (level != 0) {
433
            i += run;
434
            if (i > MAX_INDEX)
435
                break;
436
            j = scantable[i];
437
            level = ((level * 2 + 1) * qscale) >> 1;
438
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
439
                    SHOW_SBITS(re, &s->gb, 1);
440
            SKIP_BITS(re, &s->gb, 1);
441
        } else {
442
            /* escape */
443
            run = SHOW_UBITS(re, &s->gb, 6) + 1;
444
            LAST_SKIP_BITS(re, &s->gb, 6);
445
            UPDATE_CACHE(re, &s->gb);
446
            level = SHOW_SBITS(re, &s->gb, 12);
447
            SKIP_BITS(re, &s->gb, 12);
448
449
            i += run;
450
            if (i > MAX_INDEX)
451
                break;
452
            j = scantable[i];
453
            if (level < 0) {
454
                level = ((-level * 2 + 1) * qscale) >> 1;
455
                level = -level;
456
            } else {
457
                level = ((level * 2 + 1) * qscale) >> 1;
458
            }
459
        }
460
461
        block[j] = level;
462
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
463
            break;
464
465
        UPDATE_CACHE(re, &s->gb);
466
    }
467
end:
468
    LAST_SKIP_BITS(re, &s->gb, 2);
469
    CLOSE_READER(re, &s->gb);
470
471
    check_scantable_index(s, i);
472
473
    s->block_last_index[n] = i;
474
    return 0;
475
}
476
477
1624926
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
478
                                           int16_t *block, int n)
479
{
480
    int level, dc, diff, i, j, run;
481
    int component;
482
    RLTable *rl;
483
1624926
    uint8_t *const scantable = s->intra_scantable.permutated;
484
    const uint16_t *quant_matrix;
485
1624926
    const int qscale = s->qscale;
486
    int mismatch;
487
488
    /* DC coefficient */
489
1624926
    if (n < 4) {
490
1011540
        quant_matrix = s->intra_matrix;
491
1011540
        component    = 0;
492
    } else {
493
613386
        quant_matrix = s->chroma_intra_matrix;
494
613386
        component    = (n & 1) + 1;
495
    }
496
1624926
    diff = decode_dc(&s->gb, component);
497
1624926
    dc  = s->last_dc[component];
498
1624926
    dc += diff;
499
1624926
    s->last_dc[component] = dc;
500
1624926
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
501
    ff_tlog(s->avctx, "dc=%d\n", block[0]);
502
1624926
    mismatch = block[0] ^ 1;
503
1624926
    i = 0;
504
1624926
    if (s->intra_vlc_format)
505
1039632
        rl = &ff_rl_mpeg2;
506
    else
507
585294
        rl = &ff_rl_mpeg1;
508
509
    {
510
1624926
        OPEN_READER(re, &s->gb);
511
        /* now quantify & encode AC coefficients */
512
        for (;;) {
513
12775088
            UPDATE_CACHE(re, &s->gb);
514
12775088
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
515
                       TEX_VLC_BITS, 2, 0);
516
517
12775088
            if (level == 127) {
518
1624922
                break;
519
11150166
            } else if (level != 0) {
520
11027900
                i += run;
521
11027900
                if (i > MAX_INDEX)
522
4
                    break;
523
11027896
                j = scantable[i];
524
11027896
                level = (level * qscale * quant_matrix[j]) >> 4;
525
11027896
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
526
11027896
                        SHOW_SBITS(re, &s->gb, 1);
527
11027896
                LAST_SKIP_BITS(re, &s->gb, 1);
528
            } else {
529
                /* escape */
530
122266
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
531
122266
                SKIP_BITS(re, &s->gb, 6);
532
122266
                level = SHOW_SBITS(re, &s->gb, 12);
533
122266
                LAST_SKIP_BITS(re, &s->gb, 12);
534
122266
                i += run;
535
122266
                if (i > MAX_INDEX)
536
                    break;
537
122266
                j = scantable[i];
538
122266
                if (level < 0) {
539
53361
                    level = (-level * qscale * quant_matrix[j]) >> 4;
540
53361
                    level = -level;
541
                } else {
542
68905
                    level = (level * qscale * quant_matrix[j]) >> 4;
543
                }
544
            }
545
546
11150162
            mismatch ^= level;
547
11150162
            block[j]  = level;
548
        }
549
1624926
        CLOSE_READER(re, &s->gb);
550
    }
551
1624926
    block[63] ^= mismatch & 1;
552
553
1624926
    check_scantable_index(s, i);
554
555
1624922
    s->block_last_index[n] = i;
556
1624922
    return 0;
557
}
558
559
/**
560
 * Changing this would eat up any speed benefits it has.
561
 * Do not use "fast" flag if you need the code to be robust.
562
 */
563
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
564
                                                int16_t *block, int n)
565
{
566
    int level, dc, diff, i, j, run;
567
    int component;
568
    RLTable *rl;
569
    uint8_t *const scantable = s->intra_scantable.permutated;
570
    const uint16_t *quant_matrix;
571
    const int qscale = s->qscale;
572
573
    /* DC coefficient */
574
    if (n < 4) {
575
        quant_matrix = s->intra_matrix;
576
        component    = 0;
577
    } else {
578
        quant_matrix = s->chroma_intra_matrix;
579
        component    = (n & 1) + 1;
580
    }
581
    diff = decode_dc(&s->gb, component);
582
    dc = s->last_dc[component];
583
    dc += diff;
584
    s->last_dc[component] = dc;
585
    block[0] = dc * (1 << (3 - s->intra_dc_precision));
586
    i = 0;
587
    if (s->intra_vlc_format)
588
        rl = &ff_rl_mpeg2;
589
    else
590
        rl = &ff_rl_mpeg1;
591
592
    {
593
        OPEN_READER(re, &s->gb);
594
        /* now quantify & encode AC coefficients */
595
        for (;;) {
596
            UPDATE_CACHE(re, &s->gb);
597
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
598
                       TEX_VLC_BITS, 2, 0);
599
600
            if (level >= 64 || i > 63) {
601
                break;
602
            } else if (level != 0) {
603
                i += run;
604
                j = scantable[i];
605
                level = (level * qscale * quant_matrix[j]) >> 4;
606
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
607
                        SHOW_SBITS(re, &s->gb, 1);
608
                LAST_SKIP_BITS(re, &s->gb, 1);
609
            } else {
610
                /* escape */
611
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
612
                SKIP_BITS(re, &s->gb, 6);
613
                level = SHOW_SBITS(re, &s->gb, 12);
614
                LAST_SKIP_BITS(re, &s->gb, 12);
615
                i += run;
616
                j = scantable[i];
617
                if (level < 0) {
618
                    level = (-level * qscale * quant_matrix[j]) >> 4;
619
                    level = -level;
620
                } else {
621
                    level = (level * qscale * quant_matrix[j]) >> 4;
622
                }
623
            }
624
625
            block[j] = level;
626
        }
627
        CLOSE_READER(re, &s->gb);
628
    }
629
630
    check_scantable_index(s, i);
631
632
    s->block_last_index[n] = i;
633
    return 0;
634
}
635
636
/******************************************/
637
/* decoding */
638
639
30328
static inline int get_dmv(MpegEncContext *s)
640
{
641
30328
    if (get_bits1(&s->gb))
642
28315
        return 1 - (get_bits1(&s->gb) << 1);
643
    else
644
2013
        return 0;
645
}
646
647
/* motion type (for MPEG-2) */
648
#define MT_FIELD 1
649
#define MT_FRAME 2
650
#define MT_16X8  2
651
#define MT_DMV   3
652
653
2059378
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
654
{
655
    int i, j, k, cbp, val, mb_type, motion_type;
656
2059378
    const int mb_block_count = 4 + (1 << s->chroma_format);
657
    int ret;
658
659
    ff_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
660
661
    av_assert2(s->mb_skipped == 0);
662
663
2059378
    if (s->mb_skip_run-- != 0) {
664
154709
        if (s->pict_type == AV_PICTURE_TYPE_P) {
665
51652
            s->mb_skipped = 1;
666
51652
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
667
                MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
668
        } else {
669
            int mb_type;
670
671
103057
            if (s->mb_x)
672
103057
                mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
673
            else
674
                // FIXME not sure if this is allowed in MPEG at all
675
                mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
676
103057
            if (IS_INTRA(mb_type)) {
677
                av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
678
                return AVERROR_INVALIDDATA;
679
            }
680
103057
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
681
103057
                mb_type | MB_TYPE_SKIP;
682
683
103057
            if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
684
73394
                s->mb_skipped = 1;
685
        }
686
687
154709
        return 0;
688
    }
689
690
1904669
    switch (s->pict_type) {
691
204195
    default:
692
    case AV_PICTURE_TYPE_I:
693
204195
        if (get_bits1(&s->gb) == 0) {
694
16344
            if (get_bits1(&s->gb) == 0) {
695
                av_log(s->avctx, AV_LOG_ERROR,
696
                       "Invalid mb type in I-frame at %d %d\n",
697
                       s->mb_x, s->mb_y);
698
                return AVERROR_INVALIDDATA;
699
            }
700
16344
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
701
        } else {
702
187851
            mb_type = MB_TYPE_INTRA;
703
        }
704
204195
        break;
705
1069428
    case AV_PICTURE_TYPE_P:
706
1069428
        mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
707
1069428
        if (mb_type < 0) {
708
            av_log(s->avctx, AV_LOG_ERROR,
709
                   "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
710
            return AVERROR_INVALIDDATA;
711
        }
712
1069428
        mb_type = ptype2mb_type[mb_type];
713
1069428
        break;
714
631046
    case AV_PICTURE_TYPE_B:
715
631046
        mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
716
631046
        if (mb_type < 0) {
717
            av_log(s->avctx, AV_LOG_ERROR,
718
                   "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
719
            return AVERROR_INVALIDDATA;
720
        }
721
631046
        mb_type = btype2mb_type[mb_type];
722
631046
        break;
723
    }
724
    ff_tlog(s->avctx, "mb_type=%x\n", mb_type);
725
//    motion_type = 0; /* avoid warning */
726
1904669
    if (IS_INTRA(mb_type)) {
727
273908
        s->bdsp.clear_blocks(s->block[0]);
728
729
273908
        if (!s->chroma_y_shift)
730
53810
            s->bdsp.clear_blocks(s->block[6]);
731
732
        /* compute DCT type */
733
        // FIXME: add an interlaced_dct coded var?
734
273908
        if (s->picture_structure == PICT_FRAME &&
735
230337
            !s->frame_pred_frame_dct)
736
96158
            s->interlaced_dct = get_bits1(&s->gb);
737
738
273908
        if (IS_QUANT(mb_type))
739
22653
            s->qscale = mpeg_get_qscale(s);
740
741
273908
        if (s->concealment_motion_vectors) {
742
            /* just parse them */
743
678
            if (s->picture_structure != PICT_FRAME)
744
675
                skip_bits1(&s->gb);  /* field select */
745
746
678
            s->mv[0][0][0]      =
747
678
            s->last_mv[0][0][0] =
748
678
            s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
749
                                                     s->last_mv[0][0][0]);
750
678
            s->mv[0][0][1]      =
751
678
            s->last_mv[0][0][1] =
752
678
            s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
753
                                                     s->last_mv[0][0][1]);
754
755
678
            check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
756
        } else {
757
            /* reset mv prediction */
758
273230
            memset(s->last_mv, 0, sizeof(s->last_mv));
759
        }
760
273908
        s->mb_intra = 1;
761
        // if 1, we memcpy blocks in xvmcvideo
762
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
763
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
764
765
273908
        if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
766
252887
            if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
767
                for (i = 0; i < 6; i++)
768
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
769
            } else {
770
1877809
                for (i = 0; i < mb_block_count; i++)
771
1624926
                    if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
772
4
                        return ret;
773
            }
774
        } else {
775
147147
            for (i = 0; i < 6; i++) {
776
126126
                ret = ff_mpeg1_decode_block_intra(&s->gb,
777
126126
                                                  s->intra_matrix,
778
126126
                                                  s->intra_scantable.permutated,
779
126126
                                                  s->last_dc, *s->pblocks[i],
780
                                                  i, s->qscale);
781
126126
                if (ret < 0) {
782
                    av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
783
                           s->mb_x, s->mb_y);
784
                    return ret;
785
                }
786
787
126126
                s->block_last_index[i] = ret;
788
            }
789
        }
790
    } else {
791
1630761
        if (mb_type & MB_TYPE_ZERO_MV) {
792
            av_assert2(mb_type & MB_TYPE_CBP);
793
794
154462
            s->mv_dir = MV_DIR_FORWARD;
795
154462
            if (s->picture_structure == PICT_FRAME) {
796
64497
                if (s->picture_structure == PICT_FRAME
797
64497
                    && !s->frame_pred_frame_dct)
798
39580
                    s->interlaced_dct = get_bits1(&s->gb);
799
64497
                s->mv_type = MV_TYPE_16X16;
800
            } else {
801
89965
                s->mv_type            = MV_TYPE_FIELD;
802
89965
                mb_type              |= MB_TYPE_INTERLACED;
803
89965
                s->field_select[0][0] = s->picture_structure - 1;
804
            }
805
806
154462
            if (IS_QUANT(mb_type))
807
38251
                s->qscale = mpeg_get_qscale(s);
808
809
154462
            s->last_mv[0][0][0] = 0;
810
154462
            s->last_mv[0][0][1] = 0;
811
154462
            s->last_mv[0][1][0] = 0;
812
154462
            s->last_mv[0][1][1] = 0;
813
154462
            s->mv[0][0][0]      = 0;
814
154462
            s->mv[0][0][1]      = 0;
815
        } else {
816
            av_assert2(mb_type & MB_TYPE_L0L1);
817
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
818
            /* get additional motion vector type */
819

1476299
            if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
820
603374
                motion_type = MT_FRAME;
821
            } else {
822
872925
                motion_type = get_bits(&s->gb, 2);
823

872925
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
824
357276
                    s->interlaced_dct = get_bits1(&s->gb);
825
            }
826
827
1476299
            if (IS_QUANT(mb_type))
828
135734
                s->qscale = mpeg_get_qscale(s);
829
830
            /* motion vectors */
831
1476299
            s->mv_dir = (mb_type >> 13) & 3;
832
            ff_tlog(s->avctx, "motion_type=%d\n", motion_type);
833

1476299
            switch (motion_type) {
834
1236664
            case MT_FRAME: /* or MT_16X8 */
835
1236664
                if (s->picture_structure == PICT_FRAME) {
836
1034164
                    mb_type   |= MB_TYPE_16x16;
837
1034164
                    s->mv_type = MV_TYPE_16X16;
838
3102492
                    for (i = 0; i < 2; i++) {
839
2068328
                        if (USES_LIST(mb_type, i)) {
840
                            /* MT_FRAME */
841
1323224
                            s->mv[i][0][0]      =
842
1323224
                            s->last_mv[i][0][0] =
843
1323224
                            s->last_mv[i][1][0] =
844
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0],
845
                                                   s->last_mv[i][0][0]);
846
1323224
                            s->mv[i][0][1]      =
847
1323224
                            s->last_mv[i][0][1] =
848
1323224
                            s->last_mv[i][1][1] =
849
1323224
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1],
850
                                                   s->last_mv[i][0][1]);
851
                            /* full_pel: only for MPEG-1 */
852
1323224
                            if (s->full_pel[i]) {
853
                                s->mv[i][0][0] *= 2;
854
                                s->mv[i][0][1] *= 2;
855
                            }
856
                        }
857
                    }
858
                } else {
859
202500
                    mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
860
202500
                    s->mv_type = MV_TYPE_16X8;
861
607500
                    for (i = 0; i < 2; i++) {
862
405000
                        if (USES_LIST(mb_type, i)) {
863
                            /* MT_16X8 */
864
609543
                            for (j = 0; j < 2; j++) {
865
406362
                                s->field_select[i][j] = get_bits1(&s->gb);
866
1219086
                                for (k = 0; k < 2; k++) {
867
812724
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
868
                                                             s->last_mv[i][j][k]);
869
812724
                                    s->last_mv[i][j][k] = val;
870
812724
                                    s->mv[i][j][k]      = val;
871
                                }
872
                            }
873
                        }
874
                    }
875
                }
876
1236664
                break;
877
224471
            case MT_FIELD:
878
224471
                s->mv_type = MV_TYPE_FIELD;
879
224471
                if (s->picture_structure == PICT_FRAME) {
880
63707
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
881
191121
                    for (i = 0; i < 2; i++) {
882
127414
                        if (USES_LIST(mb_type, i)) {
883
230964
                            for (j = 0; j < 2; j++) {
884
153976
                                s->field_select[i][j] = get_bits1(&s->gb);
885
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
886
                                                         s->last_mv[i][j][0]);
887
153976
                                s->last_mv[i][j][0] = val;
888
153976
                                s->mv[i][j][0]      = val;
889
                                ff_tlog(s->avctx, "fmx=%d\n", val);
890
153976
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
891
153976
                                                         s->last_mv[i][j][1] >> 1);
892
153976
                                s->last_mv[i][j][1] = 2 * val;
893
153976
                                s->mv[i][j][1]      = val;
894
                                ff_tlog(s->avctx, "fmy=%d\n", val);
895
                            }
896
                        }
897
                    }
898
                } else {
899
160764
                    av_assert0(!s->progressive_sequence);
900
160764
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
901
482292
                    for (i = 0; i < 2; i++) {
902
321528
                        if (USES_LIST(mb_type, i)) {
903
165424
                            s->field_select[i][0] = get_bits1(&s->gb);
904
496272
                            for (k = 0; k < 2; k++) {
905
330848
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
906
                                                         s->last_mv[i][0][k]);
907
330848
                                s->last_mv[i][0][k] = val;
908
330848
                                s->last_mv[i][1][k] = val;
909
330848
                                s->mv[i][0][k]      = val;
910
                            }
911
                        }
912
                    }
913
                }
914
224471
                break;
915
15164
            case MT_DMV:
916
15164
                if (s->progressive_sequence){
917
                    av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
918
                    return AVERROR_INVALIDDATA;
919
                }
920
15164
                s->mv_type = MV_TYPE_DMV;
921
45492
                for (i = 0; i < 2; i++) {
922
30328
                    if (USES_LIST(mb_type, i)) {
923
                        int dmx, dmy, mx, my, m;
924
15164
                        const int my_shift = s->picture_structure == PICT_FRAME;
925
926
15164
                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
927
                                                s->last_mv[i][0][0]);
928
15164
                        s->last_mv[i][0][0] = mx;
929
15164
                        s->last_mv[i][1][0] = mx;
930
15164
                        dmx = get_dmv(s);
931
15164
                        my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
932
15164
                                                 s->last_mv[i][0][1] >> my_shift);
933
15164
                        dmy = get_dmv(s);
934
935
936
15164
                        s->last_mv[i][0][1] = my * (1 << my_shift);
937
15164
                        s->last_mv[i][1][1] = my * (1 << my_shift);
938
939
15164
                        s->mv[i][0][0] = mx;
940
15164
                        s->mv[i][0][1] = my;
941
15164
                        s->mv[i][1][0] = mx; // not used
942
15164
                        s->mv[i][1][1] = my; // not used
943
944
15164
                        if (s->picture_structure == PICT_FRAME) {
945
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
946
947
                            // m = 1 + 2 * s->top_field_first;
948
                            m = s->top_field_first ? 1 : 3;
949
950
                            /* top -> top pred */
951
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
952
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
953
                            m = 4 - m;
954
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
955
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
956
                        } else {
957
15164
                            mb_type |= MB_TYPE_16x16;
958
959
15164
                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
960
15164
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
961
15164
                            if (s->picture_structure == PICT_TOP_FIELD)
962
13048
                                s->mv[i][2][1]--;
963
                            else
964
2116
                                s->mv[i][2][1]++;
965
                        }
966
                    }
967
                }
968
15164
                break;
969
            default:
970
                av_log(s->avctx, AV_LOG_ERROR,
971
                       "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
972
                return AVERROR_INVALIDDATA;
973
            }
974
        }
975
976
1630761
        s->mb_intra = 0;
977
1630761
        if (HAS_CBP(mb_type)) {
978
1295669
            s->bdsp.clear_blocks(s->block[0]);
979
980
1295669
            cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
981
1295669
            if (mb_block_count > 6) {
982
46345
                cbp *= 1 << mb_block_count - 6;
983
46345
                cbp  |= get_bits(&s->gb, mb_block_count - 6);
984
46345
                s->bdsp.clear_blocks(s->block[6]);
985
            }
986
1295669
            if (cbp <= 0) {
987
                av_log(s->avctx, AV_LOG_ERROR,
988
                       "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
989
                return AVERROR_INVALIDDATA;
990
            }
991
992
            // if 1, we memcpy blocks in xvmcvideo
993
            if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
994
                ff_xvmc_pack_pblocks(s, cbp);
995
996
1295669
            if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
997
1183927
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
998
                    for (i = 0; i < 6; i++) {
999
                        if (cbp & 32)
1000
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1001
                        else
1002
                            s->block_last_index[i] = -1;
1003
                        cbp += cbp;
1004
                    }
1005
                } else {
1006
1183927
                    cbp <<= 12 - mb_block_count;
1007
1008
8380179
                    for (i = 0; i < mb_block_count; i++) {
1009
7196252
                        if (cbp & (1 << 11)) {
1010
3807658
                            if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
1011
                                return ret;
1012
                        } else {
1013
3388594
                            s->block_last_index[i] = -1;
1014
                        }
1015
7196252
                        cbp += cbp;
1016
                    }
1017
                }
1018
            } else {
1019
111742
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1020
                    for (i = 0; i < 6; i++) {
1021
                        if (cbp & 32)
1022
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1023
                        else
1024
                            s->block_last_index[i] = -1;
1025
                        cbp += cbp;
1026
                    }
1027
                } else {
1028
782194
                    for (i = 0; i < 6; i++) {
1029
670452
                        if (cbp & 32) {
1030
403118
                            if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
1031
                                return ret;
1032
                        } else {
1033
267334
                            s->block_last_index[i] = -1;
1034
                        }
1035
670452
                        cbp += cbp;
1036
                    }
1037
                }
1038
            }
1039
        } else {
1040
4356196
            for (i = 0; i < 12; i++)
1041
4021104
                s->block_last_index[i] = -1;
1042
        }
1043
    }
1044
1045
1904665
    s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
1046
1047
1904665
    return 0;
1048
}
1049
1050
259
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1051
{
1052
259
    Mpeg1Context *s    = avctx->priv_data;
1053
259
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
1054
1055
259
    if (   avctx->codec_tag != AV_RL32("VCR2")
1056
257
        && avctx->codec_tag != AV_RL32("BW10"))
1057
257
        avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
1058
259
    ff_mpv_decode_init(s2, avctx);
1059
1060
    /* we need some permutation to store matrices,
1061
     * until the decoder sets the real permutation. */
1062
259
    ff_mpv_idct_init(s2);
1063
259
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1064
259
    ff_mpeg12_init_vlcs();
1065
1066
259
    s2->chroma_format              = 1;
1067
259
    s->mpeg_enc_ctx_allocated      = 0;
1068
259
    s->mpeg_enc_ctx.picture_number = 0;
1069
259
    s->repeat_field                = 0;
1070
259
    avctx->color_range             = AVCOL_RANGE_MPEG;
1071
259
    return 0;
1072
}
1073
1074
#if HAVE_THREADS
1075
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
1076
                                             const AVCodecContext *avctx_from)
1077
{
1078
    Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
1079
    MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
1080
    int err;
1081
1082
    if (avctx == avctx_from               ||
1083
        !ctx_from->mpeg_enc_ctx_allocated ||
1084
        !s1->context_initialized)
1085
        return 0;
1086
1087
    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1088
    if (err)
1089
        return err;
1090
1091
    if (!ctx->mpeg_enc_ctx_allocated)
1092
        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
1093
1094
    if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
1095
        s->picture_number++;
1096
1097
    return 0;
1098
}
1099
#endif
1100
1101
960
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1102
                                 const uint8_t *new_perm)
1103
{
1104
    uint16_t temp_matrix[64];
1105
    int i;
1106
1107
960
    memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
1108
1109
62400
    for (i = 0; i < 64; i++)
1110
61440
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1111
960
}
1112
1113
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1114
#if CONFIG_MPEG1_NVDEC_HWACCEL
1115
    AV_PIX_FMT_CUDA,
1116
#endif
1117
#if CONFIG_MPEG1_XVMC_HWACCEL
1118
    AV_PIX_FMT_XVMC,
1119
#endif
1120
#if CONFIG_MPEG1_VDPAU_HWACCEL
1121
    AV_PIX_FMT_VDPAU,
1122
#endif
1123
    AV_PIX_FMT_YUV420P,
1124
    AV_PIX_FMT_NONE
1125
};
1126
1127
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1128
#if CONFIG_MPEG2_NVDEC_HWACCEL
1129
    AV_PIX_FMT_CUDA,
1130
#endif
1131
#if CONFIG_MPEG2_XVMC_HWACCEL
1132
    AV_PIX_FMT_XVMC,
1133
#endif
1134
#if CONFIG_MPEG2_VDPAU_HWACCEL
1135
    AV_PIX_FMT_VDPAU,
1136
#endif
1137
#if CONFIG_MPEG2_DXVA2_HWACCEL
1138
    AV_PIX_FMT_DXVA2_VLD,
1139
#endif
1140
#if CONFIG_MPEG2_D3D11VA_HWACCEL
1141
    AV_PIX_FMT_D3D11VA_VLD,
1142
    AV_PIX_FMT_D3D11,
1143
#endif
1144
#if CONFIG_MPEG2_VAAPI_HWACCEL
1145
    AV_PIX_FMT_VAAPI,
1146
#endif
1147
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
1148
    AV_PIX_FMT_VIDEOTOOLBOX,
1149
#endif
1150
    AV_PIX_FMT_YUV420P,
1151
    AV_PIX_FMT_NONE
1152
};
1153
1154
static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
1155
    AV_PIX_FMT_YUV422P,
1156
    AV_PIX_FMT_NONE
1157
};
1158
1159
static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
1160
    AV_PIX_FMT_YUV444P,
1161
    AV_PIX_FMT_NONE
1162
};
1163
1164
242
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
1165
{
1166
242
    Mpeg1Context *s1  = avctx->priv_data;
1167
242
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1168
    const enum AVPixelFormat *pix_fmts;
1169
1170
    if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
1171
        return AV_PIX_FMT_GRAY8;
1172
1173
242
    if (s->chroma_format < 2)
1174
187
        pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
1175
187
                                mpeg1_hwaccel_pixfmt_list_420 :
1176
                                mpeg2_hwaccel_pixfmt_list_420;
1177
55
    else if (s->chroma_format == 2)
1178
55
        pix_fmts = mpeg12_pixfmt_list_422;
1179
    else
1180
        pix_fmts = mpeg12_pixfmt_list_444;
1181
1182
242
    return ff_thread_get_format(avctx, pix_fmts);
1183
}
1184
1185
242
static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
1186
{
1187
    // until then pix_fmt may be changed right after codec init
1188
242
    if (avctx->hwaccel)
1189
        if (avctx->idct_algo == FF_IDCT_AUTO)
1190
            avctx->idct_algo = FF_IDCT_NONE;
1191
1192

242
    if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
1193
        Mpeg1Context *s1 = avctx->priv_data;
1194
        MpegEncContext *s = &s1->mpeg_enc_ctx;
1195
1196
        s->pack_pblocks = 1;
1197
    }
1198
242
}
1199
1200
/* Call this function when we know all parameters.
1201
 * It may be called in different places for MPEG-1 and MPEG-2. */
1202
4455
static int mpeg_decode_postinit(AVCodecContext *avctx)
1203
{
1204
4455
    Mpeg1Context *s1  = avctx->priv_data;
1205
4455
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1206
    uint8_t old_permutation[64];
1207
    int ret;
1208
1209
4455
    if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1210
        // MPEG-1 aspect
1211
494
        AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1212
494
        avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
1213
    } else { // MPEG-2
1214
        // MPEG-2 aspect
1215
3961
        if (s->aspect_ratio_info > 1) {
1216
            AVRational dar =
1217
1948
                av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1218
1948
                                  (AVRational) { s1->pan_scan.width,
1219
1948
                                                 s1->pan_scan.height }),
1220
1948
                         (AVRational) { s->width, s->height });
1221
1222
            /* We ignore the spec here and guess a bit as reality does not
1223
             * match the spec, see for example res_change_ffmpeg_aspect.ts
1224
             * and sequence-display-aspect.mpg.
1225
             * issue1613, 621, 562 */
1226

2242
            if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1227
308
                (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
1228
14
                 av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1229
1668
                s->avctx->sample_aspect_ratio =
1230
1668
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1231
1668
                             (AVRational) { s->width, s->height });
1232
            } else {
1233
280
                s->avctx->sample_aspect_ratio =
1234
280
                    av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1235
280
                             (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
1236
// issue1613 4/3 16/9 -> 16/9
1237
// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
1238
// widescreen-issue562.mpg 4/3 16/9 -> 16/9
1239
//                s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1240
                ff_dlog(avctx, "aspect A %d/%d\n",
1241
                        ff_mpeg2_aspect[s->aspect_ratio_info].num,
1242
                        ff_mpeg2_aspect[s->aspect_ratio_info].den);
1243
                ff_dlog(avctx, "aspect B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1244
                        s->avctx->sample_aspect_ratio.den);
1245
            }
1246
        } else {
1247
2013
            s->avctx->sample_aspect_ratio =
1248
2013
                ff_mpeg2_aspect[s->aspect_ratio_info];
1249
        }
1250
    } // MPEG-2
1251
1252
4455
    if (av_image_check_sar(s->width, s->height,
1253
                           avctx->sample_aspect_ratio) < 0) {
1254
        av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
1255
                avctx->sample_aspect_ratio.num,
1256
                avctx->sample_aspect_ratio.den);
1257
        avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
1258
    }
1259
1260
4455
    if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
1261
4217
        avctx->coded_width       != s->width                ||
1262
4217
        avctx->coded_height      != s->height               ||
1263
4217
        s1->save_width           != s->width                ||
1264

8434
        s1->save_height          != s->height               ||
1265
4217
        av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
1266

4215
        (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1267
        0) {
1268
240
        if (s1->mpeg_enc_ctx_allocated) {
1269
2
            ParseContext pc = s->parse_context;
1270
2
            s->parse_context.buffer = 0;
1271
2
            ff_mpv_common_end(s);
1272
2
            s->parse_context = pc;
1273
2
            s1->mpeg_enc_ctx_allocated = 0;
1274
        }
1275
1276
240
        ret = ff_set_dimensions(avctx, s->width, s->height);
1277
240
        if (ret < 0)
1278
            return ret;
1279
1280

240
        if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
1281
213
            avctx->rc_max_rate = s->bit_rate;
1282

27
        } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
1283

25
                   (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
1284
25
            avctx->bit_rate = s->bit_rate;
1285
        }
1286
240
        s1->save_aspect          = s->avctx->sample_aspect_ratio;
1287
240
        s1->save_width           = s->width;
1288
240
        s1->save_height          = s->height;
1289
240
        s1->save_progressive_seq = s->progressive_sequence;
1290
1291
        /* low_delay may be forced, in this case we will have B-frames
1292
         * that behave like P-frames. */
1293
240
        avctx->has_b_frames = !s->low_delay;
1294
1295
240
        if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1296
            // MPEG-1 fps
1297
25
            avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1298
25
            avctx->ticks_per_frame     = 1;
1299
1300
25
            avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1301
        } else { // MPEG-2
1302
            // MPEG-2 fps
1303
215
            av_reduce(&s->avctx->framerate.num,
1304
215
                      &s->avctx->framerate.den,
1305
215
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num,
1306
215
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1307
                      1 << 30);
1308
215
            avctx->ticks_per_frame = 2;
1309
1310
215
            switch (s->chroma_format) {
1311
160
            case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
1312
55
            case 2:
1313
55
            case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
1314
            default: av_assert0(0);
1315
            }
1316
        } // MPEG-2
1317
1318
240
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1319
240
        setup_hwaccel_for_pixfmt(avctx);
1320
1321
        /* Quantization matrices may need reordering
1322
         * if DCT permutation is changed. */
1323
240
        memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1324
1325
240
        ff_mpv_idct_init(s);
1326
240
        if ((ret = ff_mpv_common_init(s)) < 0)
1327
            return ret;
1328
1329
240
        quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
1330
240
        quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
1331
240
        quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
1332
240
        quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1333
1334
240
        s1->mpeg_enc_ctx_allocated = 1;
1335
    }
1336
4455
    return 0;
1337
}
1338
1339
4455
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
1340
                                int buf_size)
1341
{
1342
4455
    Mpeg1Context *s1  = avctx->priv_data;
1343
4455
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1344
    int ref, f_code, vbv_delay;
1345
1346
4455
    init_get_bits(&s->gb, buf, buf_size * 8);
1347
1348
4455
    ref = get_bits(&s->gb, 10); /* temporal ref */
1349
4455
    s->pict_type = get_bits(&s->gb, 3);
1350

4455
    if (s->pict_type == 0 || s->pict_type > 3)
1351
        return AVERROR_INVALIDDATA;
1352
1353
4455
    vbv_delay = get_bits(&s->gb, 16);
1354
4455
    s->vbv_delay = vbv_delay;
1355
4455
    if (s->pict_type == AV_PICTURE_TYPE_P ||
1356
2104
        s->pict_type == AV_PICTURE_TYPE_B) {
1357
3791
        s->full_pel[0] = get_bits1(&s->gb);
1358
3791
        f_code = get_bits(&s->gb, 3);
1359

3791
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1360
            return AVERROR_INVALIDDATA;
1361
3791
        f_code += !f_code;
1362
3791
        s->mpeg_f_code[0][0] = f_code;
1363
3791
        s->mpeg_f_code[0][1] = f_code;
1364
    }
1365
4455
    if (s->pict_type == AV_PICTURE_TYPE_B) {
1366
1440
        s->full_pel[1] = get_bits1(&s->gb);
1367
1440
        f_code = get_bits(&s->gb, 3);
1368

1440
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1369
            return AVERROR_INVALIDDATA;
1370
1440
        f_code += !f_code;
1371
1440
        s->mpeg_f_code[1][0] = f_code;
1372
1440
        s->mpeg_f_code[1][1] = f_code;
1373
    }
1374
4455
    s->current_picture.f->pict_type = s->pict_type;
1375
4455
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1376
1377
4455
    if (avctx->debug & FF_DEBUG_PICT_INFO)
1378
        av_log(avctx, AV_LOG_DEBUG,
1379
               "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1380
1381
4455
    s->y_dc_scale = 8;
1382
4455
    s->c_dc_scale = 8;
1383
4455
    return 0;
1384
}
1385
1386
651
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1387
{
1388
651
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1389
    int horiz_size_ext, vert_size_ext;
1390
    int bit_rate_ext;
1391
    AVCPBProperties *cpb_props;
1392
1393
651
    skip_bits(&s->gb, 1); /* profile and level esc*/
1394
651
    s->avctx->profile       = get_bits(&s->gb, 3);
1395
651
    s->avctx->level         = get_bits(&s->gb, 4);
1396
651
    s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1397
651
    s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1398
1399
651
    if (!s->chroma_format) {
1400
        s->chroma_format = 1;
1401
        av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
1402
    }
1403
1404
651
    horiz_size_ext          = get_bits(&s->gb, 2);
1405
651
    vert_size_ext           = get_bits(&s->gb, 2);
1406
651
    s->width  |= (horiz_size_ext << 12);
1407
651
    s->height |= (vert_size_ext  << 12);
1408
651
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
1409
651
    s->bit_rate += (bit_rate_ext << 18) * 400LL;
1410
651
    check_marker(s->avctx, &s->gb, "after bit rate extension");
1411
651
    s1->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
1412
1413
651
    s->low_delay = get_bits1(&s->gb);
1414
651
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1415
        s->low_delay = 1;
1416
1417
651
    s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
1418
651
    s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
1419
1420
    ff_dlog(s->avctx, "sequence extension\n");
1421
651
    s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1422
1423
651
    if (cpb_props = ff_add_cpb_side_data(s->avctx)) {
1424
651
        cpb_props->buffer_size = s1->rc_buffer_size;
1425
651
        if (s->bit_rate != 0x3FFFF*400)
1426
234
            cpb_props->max_bitrate = s->bit_rate;
1427
    }
1428
1429
651
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1430
        av_log(s->avctx, AV_LOG_DEBUG,
1431
               "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
1432
               s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1433
               s1->rc_buffer_size, s->bit_rate);
1434
651
}
1435
1436
65
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1437
{
1438
65
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1439
    int color_description, w, h;
1440
1441
65
    skip_bits(&s->gb, 3); /* video format */
1442
65
    color_description = get_bits1(&s->gb);
1443
65
    if (color_description) {
1444
33
        s->avctx->color_primaries = get_bits(&s->gb, 8);
1445
33
        s->avctx->color_trc       = get_bits(&s->gb, 8);
1446
33
        s->avctx->colorspace      = get_bits(&s->gb, 8);
1447
    }
1448
65
    w = get_bits(&s->gb, 14);
1449
65
    skip_bits(&s->gb, 1); // marker
1450
65
    h = get_bits(&s->gb, 14);
1451
    // remaining 3 bits are zero padding
1452
1453
65
    s1->pan_scan.width  = 16 * w;
1454
65
    s1->pan_scan.height = 16 * h;
1455
1456
65
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1457
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1458
65
}
1459
1460
15
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1461
{
1462
15
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1463
    int i, nofco;
1464
1465
15
    nofco = 1;
1466
15
    if (s->progressive_sequence) {
1467
        if (s->repeat_first_field) {
1468
            nofco++;
1469
            if (s->top_field_first)
1470
                nofco++;
1471
        }
1472
    } else {
1473
15
        if (s->picture_structure == PICT_FRAME) {
1474
5
            nofco++;
1475
5
            if (s->repeat_first_field)
1476
3
                nofco++;
1477
        }
1478
    }
1479
38
    for (i = 0; i < nofco; i++) {
1480
23
        s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
1481
23
        skip_bits(&s->gb, 1); // marker
1482
23
        s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
1483
23
        skip_bits(&s->gb, 1); // marker
1484
    }
1485
1486
15
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1487
        av_log(s->avctx, AV_LOG_DEBUG,
1488
               "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1489
               s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1490
               s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1491
               s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
1492
15
}
1493
1494
145
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
1495
                       uint16_t matrix1[64], int intra)
1496
{
1497
    int i;
1498
1499
9425
    for (i = 0; i < 64; i++) {
1500
9280
        int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1501
9280
        int v = get_bits(&s->gb, 8);
1502
9280
        if (v == 0) {
1503
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1504
            return AVERROR_INVALIDDATA;
1505
        }
1506

9280
        if (intra && i == 0 && v != 8) {
1507
            av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1508
            v = 8; // needed by pink.mpg / issue1046
1509
        }
1510
9280
        matrix0[j] = v;
1511
9280
        if (matrix1)
1512
8896
            matrix1[j] = v;
1513
    }
1514
145
    return 0;
1515
}
1516
1517
691
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1518
{
1519
    ff_dlog(s->avctx, "matrix extension\n");
1520
1521
691
    if (get_bits1(&s->gb))
1522
18
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1523
691
    if (get_bits1(&s->gb))
1524
49
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1525
691
    if (get_bits1(&s->gb))
1526
5
        load_matrix(s, s->chroma_intra_matrix, NULL, 1);
1527
691
    if (get_bits1(&s->gb))
1528
1
        load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1529
691
}
1530
1531
3961
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1532
{
1533
3961
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1534
1535
3961
    s->full_pel[0]       = s->full_pel[1] = 0;
1536
3961
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1537
3961
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1538
3961
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1539
3961
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1540

3961
    if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1541
        av_log(s->avctx, AV_LOG_ERROR,
1542
               "Missing picture start code, guessing missing values\n");
1543
        if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
1544
            if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1545
                s->pict_type = AV_PICTURE_TYPE_I;
1546
            else
1547
                s->pict_type = AV_PICTURE_TYPE_P;
1548
        } else
1549
            s->pict_type = AV_PICTURE_TYPE_B;
1550
        s->current_picture.f->pict_type = s->pict_type;
1551
        s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1552
    }
1553
3961
    s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
1554
3961
    s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
1555
3961
    s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
1556
3961
    s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
1557
1558
3961
    s->intra_dc_precision         = get_bits(&s->gb, 2);
1559
3961
    s->picture_structure          = get_bits(&s->gb, 2);
1560
3961
    s->top_field_first            = get_bits1(&s->gb);
1561
3961
    s->frame_pred_frame_dct       = get_bits1(&s->gb);
1562
3961
    s->concealment_motion_vectors = get_bits1(&s->gb);
1563
3961
    s->q_scale_type               = get_bits1(&s->gb);
1564
3961
    s->intra_vlc_format           = get_bits1(&s->gb);
1565
3961
    s->alternate_scan             = get_bits1(&s->gb);
1566
3961
    s->repeat_first_field         = get_bits1(&s->gb);
1567
3961
    s->chroma_420_type            = get_bits1(&s->gb);
1568
3961
    s->progressive_frame          = get_bits1(&s->gb);
1569
1570
3961
    if (s->alternate_scan) {
1571
945
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
1572
945
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1573
    } else {
1574
3016
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
1575
3016
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1576
    }
1577
1578
    /* composite display not parsed */
1579
    ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1580
    ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
1581
    ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
1582
    ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1583
    ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1584
    ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1585
    ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1586
    ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1587
    ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1588
3961
}
1589
1590
4089
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
1591
{
1592
4089
    AVCodecContext *avctx = s->avctx;
1593
4089
    Mpeg1Context *s1      = (Mpeg1Context *) s;
1594
    int ret;
1595
1596
4089
    if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
1597
4089
        if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
1598
            return AVERROR_INVALIDDATA;
1599
    }
1600
1601
    /* start frame decoding */
1602

7576
    if (s->first_field || s->picture_structure == PICT_FRAME) {
1603
        AVFrameSideData *pan_scan;
1604
1605
3487
        if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
1606
            return ret;
1607
1608
3487
        ff_mpeg_er_frame_start(s);
1609
1610
        /* first check if we must repeat the frame */
1611
3487
        s->current_picture_ptr->f->repeat_pict = 0;
1612
3487
        if (s->repeat_first_field) {
1613
3
            if (s->progressive_sequence) {
1614
                if (s->top_field_first)
1615
                    s->current_picture_ptr->f->repeat_pict = 4;
1616
                else
1617
                    s->current_picture_ptr->f->repeat_pict = 2;
1618
3
            } else if (s->progressive_frame) {
1619
3
                s->current_picture_ptr->f->repeat_pict = 1;
1620
            }
1621
        }
1622
1623
3487
        pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1624
                                          AV_FRAME_DATA_PANSCAN,
1625
                                          sizeof(s1->pan_scan));
1626
3487
        if (!pan_scan)
1627
            return AVERROR(ENOMEM);
1628
3487
        memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
1629
1630
3487
        if (s1->a53_buf_ref) {
1631
472
            AVFrameSideData *sd = av_frame_new_side_data_from_buf(
1632
472
                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1633
                s1->a53_buf_ref);
1634
472
            if (!sd)
1635
                av_buffer_unref(&s1->a53_buf_ref);
1636
472
            s1->a53_buf_ref = NULL;
1637
        }
1638
1639
3487
        if (s1->has_stereo3d) {
1640
            AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1641
            if (!stereo)
1642
                return AVERROR(ENOMEM);
1643
1644
            *stereo = s1->stereo3d;
1645
            s1->has_stereo3d = 0;
1646
        }
1647
1648
3487
        if (s1->has_afd) {
1649
            AVFrameSideData *sd =
1650
202
                av_frame_new_side_data(s->current_picture_ptr->f,
1651
                                       AV_FRAME_DATA_AFD, 1);
1652
202
            if (!sd)
1653
                return AVERROR(ENOMEM);
1654
1655
202
            *sd->data   = s1->afd;
1656
202
            s1->has_afd = 0;
1657
        }
1658
1659
3487
        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1660
            ff_thread_finish_setup(avctx);
1661
    } else { // second field
1662
        int i;
1663
1664
602
        if (!s->current_picture_ptr) {
1665
            av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1666
            return AVERROR_INVALIDDATA;
1667
        }
1668
1669
602
        if (s->avctx->hwaccel) {
1670
            if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
1671
                av_log(avctx, AV_LOG_ERROR,
1672
                       "hardware accelerator failed to decode first field\n");
1673
                return ret;
1674
            }
1675
        }
1676
1677
3010
        for (i = 0; i < 4; i++) {
1678
2408
            s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1679
2408
            if (s->picture_structure == PICT_BOTTOM_FIELD)
1680
4
                s->current_picture.f->data[i] +=
1681
4
                    s->current_picture_ptr->f->linesize[i];
1682
        }
1683
    }
1684
1685
4089
    if (avctx->hwaccel) {
1686
        if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
1687
            return ret;
1688
    }
1689
1690
4089
    return 0;
1691
}
1692
1693
#define DECODE_SLICE_ERROR -1
1694
#define DECODE_SLICE_OK     0
1695
1696
/**
1697
 * Decode a slice.
1698
 * MpegEncContext.mb_y must be set to the MB row from the startcode.
1699
 * @return DECODE_SLICE_ERROR if the slice is damaged,
1700
 *         DECODE_SLICE_OK if this slice is OK
1701
 */
1702
111335
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
1703
                             const uint8_t **buf, int buf_size)
1704
{
1705
111335
    AVCodecContext *avctx = s->avctx;
1706
111335
    const int lowres      = s->avctx->lowres;
1707
111335
    const int field_pic   = s->picture_structure != PICT_FRAME;
1708
    int ret;
1709
1710
111335
    s->resync_mb_x =
1711
111335
    s->resync_mb_y = -1;
1712
1713
111335
    av_assert0(mb_y < s->mb_height);
1714
1715
111335
    init_get_bits(&s->gb, *buf, buf_size * 8);
1716

111335
    if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1717
        skip_bits(&s->gb, 3);
1718
1719
111335
    ff_mpeg1_clean_buffers(s);
1720
111335
    s->interlaced_dct = 0;
1721
1722
111335
    s->qscale = mpeg_get_qscale(s);
1723
1724
111335
    if (s->qscale == 0) {
1725
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1726
        return AVERROR_INVALIDDATA;
1727
    }
1728
1729
    /* extra slice info */
1730
111335
    if (skip_1stop_8data_bits(&s->gb) < 0)
1731
        return AVERROR_INVALIDDATA;
1732
1733
111335
    s->mb_x = 0;
1734
1735

111335
    if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1736
        skip_bits1(&s->gb);
1737
    } else {
1738
123534
        while (get_bits_left(&s->gb) > 0) {
1739
123534
            int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1740
                                MBINCR_VLC_BITS, 2);
1741
123534
            if (code < 0) {
1742
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1743
                return AVERROR_INVALIDDATA;
1744
            }
1745
123534
            if (code >= 33) {
1746
12199
                if (code == 33)
1747
12199
                    s->mb_x += 33;
1748
                /* otherwise, stuffing, nothing to do */
1749
            } else {
1750
111335
                s->mb_x += code;
1751
111335
                break;
1752
            }
1753
        }
1754
    }
1755
1756
111335
    if (s->mb_x >= (unsigned) s->mb_width) {
1757
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1758
        return AVERROR_INVALIDDATA;
1759
    }
1760
1761

111335
    if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1762
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1763
        int start_code = -1;
1764
        buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1765
        if (buf_end < *buf + buf_size)
1766
            buf_end -= 4;
1767
        s->mb_y = mb_y;
1768
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1769
            return DECODE_SLICE_ERROR;
1770
        *buf = buf_end;
1771
        return DECODE_SLICE_OK;
1772
    }
1773
1774
111335
    s->resync_mb_x = s->mb_x;
1775
111335
    s->resync_mb_y = s->mb_y = mb_y;
1776
111335
    s->mb_skip_run = 0;
1777
111335
    ff_init_block_index(s);
1778
1779


111335
    if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
1780
2886
        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1781
            av_log(s->avctx, AV_LOG_DEBUG,
1782
                   "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",
1783
                   s->qscale,
1784
                   s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
1785
                   s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
1786
                   s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
1787
                   (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
1788
                   (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
1789
                   s->progressive_sequence ? "ps"  : "",
1790
                   s->progressive_frame    ? "pf"  : "",
1791
                   s->alternate_scan       ? "alt" : "",
1792
                   s->top_field_first      ? "top" : "",
1793
                   s->intra_dc_precision, s->picture_structure,
1794
                   s->frame_pred_frame_dct, s->concealment_motion_vectors,
1795
                   s->q_scale_type, s->intra_vlc_format,
1796
                   s->repeat_first_field, s->chroma_420_type ? "420" : "");
1797
        }
1798
    }
1799
1800
    for (;;) {
1801
        // If 1, we memcpy blocks in xvmcvideo.
1802
1948043
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1803
            ff_xvmc_init_block(s); // set s->block
1804
1805
2059378
        if ((ret = mpeg_decode_mb(s, s->block)) < 0)
1806
4
            return ret;
1807
1808
        // Note motion_val is normally NULL unless we want to extract the MVs.
1809

2059374
        if (s->current_picture.motion_val[0] && !s->encoding) {
1810
            const int wrap = s->b8_stride;
1811
            int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
1812
            int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1813
            int motion_x, motion_y, dir, i;
1814
1815
            for (i = 0; i < 2; i++) {
1816
                for (dir = 0; dir < 2; dir++) {
1817
                    if (s->mb_intra ||
1818
                        (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1819
                        motion_x = motion_y = 0;
1820
                    } else if (s->mv_type == MV_TYPE_16X16 ||
1821
                               (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1822
                        motion_x = s->mv[dir][0][0];
1823
                        motion_y = s->mv[dir][0][1];
1824
                    } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1825
                        motion_x = s->mv[dir][i][0];
1826
                        motion_y = s->mv[dir][i][1];
1827
                    }
1828
1829
                    s->current_picture.motion_val[dir][xy][0]     = motion_x;
1830
                    s->current_picture.motion_val[dir][xy][1]     = motion_y;
1831
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1832
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1833
                    s->current_picture.ref_index [dir][b8_xy]     =
1834
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1835
                    av_assert2(s->field_select[dir][i] == 0 ||
1836
                               s->field_select[dir][i] == 1);
1837
                }
1838
                xy    += wrap;
1839
                b8_xy += 2;
1840
            }
1841
        }
1842
1843
2059374
        s->dest[0] += 16 >> lowres;
1844
2059374
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1845
2059374
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1846
1847
2059374
        ff_mpv_reconstruct_mb(s, s->block);
1848
1849
2059374
        if (++s->mb_x >= s->mb_width) {
1850
66414
            const int mb_size = 16 >> s->avctx->lowres;
1851
            int left;
1852
1853
66414
            ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1854
66414
            ff_mpv_report_decode_progress(s);
1855
1856
66414
            s->mb_x  = 0;
1857
66414
            s->mb_y += 1 << field_pic;
1858
1859
66414
            if (s->mb_y >= s->mb_height) {
1860
4085
                int left   = get_bits_left(&s->gb);
1861
8431
                int is_d10 = s->chroma_format == 2 &&
1862
261
                             s->pict_type == AV_PICTURE_TYPE_I &&
1863

49
                             avctx->profile == 0 && avctx->level == 5 &&
1864
49
                             s->intra_dc_precision == 2 &&
1865

4371
                             s->q_scale_type == 1 && s->alternate_scan == 0 &&
1866
25
                             s->progressive_frame == 0
1867
                             /* vbv_delay == 0xBBB || 0xE10 */;
1868
1869

4085
                if (left >= 32 && !is_d10) {
1870
1002
                    GetBitContext gb = s->gb;
1871
1002
                    align_get_bits(&gb);
1872
1002
                    if (show_bits(&gb, 24) == 0x060E2B) {
1873
                        av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
1874
                        is_d10 = 1;
1875
                    }
1876

1002
                    if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
1877
                        av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
1878
                        goto eos;
1879
                    }
1880
                }
1881
1882

4085
                if (left < 0 ||
1883

3788
                    (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1884

4085
                    ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1885
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
1886
                           left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
1887
                    return AVERROR_INVALIDDATA;
1888
                } else
1889
4085
                    goto eos;
1890
            }
1891
            // There are some files out there which are missing the last slice
1892
            // in cases where the slice is completely outside the visible
1893
            // area, we detect this here instead of running into the end expecting
1894
            // more data
1895
62329
            left = get_bits_left(&s->gb);
1896
62329
            if (s->mb_y >= ((s->height + 15) >> 4) &&
1897

200
                !s->progressive_sequence &&
1898
                left <= 25 &&
1899
                left >= 0 &&
1900
                s->mb_skip_run == -1 &&
1901
                (!left || show_bits(&s->gb, left) == 0))
1902
                goto eos;
1903
1904
62329
            ff_init_block_index(s);
1905
        }
1906
1907
        /* skip mb handling */
1908
2055289
        if (s->mb_skip_run == -1) {
1909
            /* read increment again */
1910
1900580
            s->mb_skip_run = 0;
1911
1229
            for (;;) {
1912
1901809
                int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
1913
                                    MBINCR_VLC_BITS, 2);
1914
1901809
                if (code < 0) {
1915
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1916
                    return AVERROR_INVALIDDATA;
1917
                }
1918
1901809
                if (code >= 33) {
1919
108475
                    if (code == 33) {
1920
1229
                        s->mb_skip_run += 33;
1921
107246
                    } else if (code == 35) {
1922

107246
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1923
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1924
                            return AVERROR_INVALIDDATA;
1925
                        }
1926
107246
                        goto eos; /* end of slice */
1927
                    }
1928
                    /* otherwise, stuffing, nothing to do */
1929
                } else {
1930
1793334
                    s->mb_skip_run += code;
1931
1793334
                    break;
1932
                }
1933
            }
1934
1793334
            if (s->mb_skip_run) {
1935
                int i;
1936
57259
                if (s->pict_type == AV_PICTURE_TYPE_I) {
1937
                    av_log(s->avctx, AV_LOG_ERROR,
1938
                           "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1939
                    return AVERROR_INVALIDDATA;
1940
                }
1941
1942
                /* skip mb */
1943
57259
                s->mb_intra = 0;
1944
744367
                for (i = 0; i < 12; i++)
1945
687108
                    s->block_last_index[i] = -1;
1946
57259
                if (s->picture_structure == PICT_FRAME)
1947
39187
                    s->mv_type = MV_TYPE_16X16;
1948
                else
1949
18072
                    s->mv_type = MV_TYPE_FIELD;
1950
57259
                if (s->pict_type == AV_PICTURE_TYPE_P) {
1951
                    /* if P type, zero motion vector is implied */
1952
20815
                    s->mv_dir             = MV_DIR_FORWARD;
1953
20815
                    s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
1954
20815
                    s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
1955
20815
                    s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
1956
20815
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1957
                } else {
1958
                    /* if B type, reuse previous vectors and directions */
1959
36444
                    s->mv[0][0][0] = s->last_mv[0][0][0];
1960
36444
                    s->mv[0][0][1] = s->last_mv[0][0][1];
1961
36444
                    s->mv[1][0][0] = s->last_mv[1][0][0];
1962
36444
                    s->mv[1][0][1] = s->last_mv[1][0][1];
1963
36444
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
1964
36444
                    s->field_select[1][0] = (s->picture_structure - 1) & 1;
1965
                }
1966
            }
1967
        }
1968
    }
1969
111331
eos: // end of slice
1970
111331
    if (get_bits_left(&s->gb) < 0) {
1971
        av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
1972
        return AVERROR_INVALIDDATA;
1973
    }
1974
111331
    *buf += (get_bits_count(&s->gb) - 1) / 8;
1975
    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);
1976
111331
    return 0;
1977
}
1978
1979
4248
static int slice_decode_thread(AVCodecContext *c, void *arg)
1980
{
1981
4248
    MpegEncContext *s   = *(void **) arg;
1982
4248
    const uint8_t *buf  = s->gb.buffer;
1983
4248
    int mb_y            = s->start_mb_y;
1984
4248
    const int field_pic = s->picture_structure != PICT_FRAME;
1985
1986
4248
    s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1987
1988
9912
    for (;;) {
1989
        uint32_t start_code;
1990
        int ret;
1991
1992
14160
        ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1993
14160
        emms_c();
1994
        ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1995
                ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
1996
                s->start_mb_y, s->end_mb_y, s->er.error_count);
1997
14160
        if (ret < 0) {
1998
            if (c->err_recognition & AV_EF_EXPLODE)
1999
4248
                return ret;
2000
            if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
2001
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2002
                                s->mb_x, s->mb_y,
2003
                                ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2004
        } else {
2005
14160
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
2006
14160
                            s->mb_x - 1, s->mb_y,
2007
                            ER_AC_END | ER_DC_END | ER_MV_END);
2008
        }
2009
2010
14160
        if (s->mb_y == s->end_mb_y)
2011
4248
            return 0;
2012
2013
9912
        start_code = -1;
2014
9912
        buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
2015

9912
        if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
2016
            return AVERROR_INVALIDDATA;
2017
9912
        mb_y       = start_code - SLICE_MIN_START_CODE;
2018

9912
        if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
2019
            mb_y += (*buf&0xE0)<<2;
2020
9912
        mb_y <<= field_pic;
2021
9912
        if (s->picture_structure == PICT_BOTTOM_FIELD)
2022
            mb_y++;
2023
9912
        if (mb_y >= s->end_mb_y)
2024
            return AVERROR_INVALIDDATA;
2025
    }
2026
}
2027
2028
/**
2029
 * Handle slice ends.
2030
 * @return 1 if it seems to be the last slice
2031
 */
2032
3748
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
2033
{
2034
3748
    Mpeg1Context *s1  = avctx->priv_data;
2035
3748
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2036
2037

3748
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
2038
260
        return 0;
2039
2040
3488
    if (s->avctx->hwaccel) {
2041
        int ret = s->avctx->hwaccel->end_frame(s->avctx);
2042
        if (ret < 0) {
2043
            av_log(avctx, AV_LOG_ERROR,
2044
                   "hardware accelerator failed to decode picture\n");
2045
            return ret;
2046
        }
2047
    }
2048
2049
    /* end of slice reached */
2050

3488
    if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2051
        /* end of image */
2052
2053
3487
        ff_er_frame_end(&s->er);
2054
2055
3487
        ff_mpv_frame_end(s);
2056
2057

5160
        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2058
1673
            int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2059
1673
            if (ret < 0)
2060
                return ret;
2061
1673
            ff_print_debug_info(s, s->current_picture_ptr, pict);
2062
1673
            ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2063
        } else {
2064
1814
            if (avctx->active_thread_type & FF_THREAD_FRAME)
2065
                s->picture_number++;
2066
            /* latency of 1 frame for I- and P-frames */
2067
            /* XXX: use another variable than picture_number */
2068
1814
            if (s->last_picture_ptr) {
2069
1755
                int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2070
1755
                if (ret < 0)
2071
                    return ret;
2072
1755
                ff_print_debug_info(s, s->last_picture_ptr, pict);
2073
1755
                ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2074
            }
2075
        }
2076
2077
3487
        return 1;
2078
    } else {
2079
1
        return 0;
2080
    }
2081
}
2082
2083
743
static int mpeg1_decode_sequence(AVCodecContext *avctx,
2084
                                 const uint8_t *buf, int buf_size)
2085
{
2086
743
    Mpeg1Context *s1  = avctx->priv_data;
2087
743
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2088
    int width, height;
2089
    int i, v, j;
2090
2091
743
    init_get_bits(&s->gb, buf, buf_size * 8);
2092
2093
743
    width  = get_bits(&s->gb, 12);
2094
743
    height = get_bits(&s->gb, 12);
2095

743
    if (width == 0 || height == 0) {
2096
        av_log(avctx, AV_LOG_WARNING,
2097
               "Invalid horizontal or vertical size value.\n");
2098
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2099
            return AVERROR_INVALIDDATA;
2100
    }
2101
743
    s->aspect_ratio_info = get_bits(&s->gb, 4);
2102
743
    if (s->aspect_ratio_info == 0) {
2103
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2104
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2105
            return AVERROR_INVALIDDATA;
2106
    }
2107
743
    s->frame_rate_index = get_bits(&s->gb, 4);
2108

743
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
2109
        av_log(avctx, AV_LOG_WARNING,
2110
               "frame_rate_index %d is invalid\n", s->frame_rate_index);
2111
        s->frame_rate_index = 1;
2112
    }
2113
743
    s->bit_rate = get_bits(&s->gb, 18) * 400LL;
2114
743
    if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
2115
        return AVERROR_INVALIDDATA;
2116
    }
2117
2118
743
    s1->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2119
743
    skip_bits(&s->gb, 1);
2120
2121
    /* get matrix */
2122
743
    if (get_bits1(&s->gb)) {
2123
18
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2124
    } else {
2125
47125
        for (i = 0; i < 64; i++) {
2126
46400
            j = s->idsp.idct_permutation[i];
2127
46400
            v = ff_mpeg1_default_intra_matrix[i];
2128
46400
            s->intra_matrix[j]        = v;
2129
46400
            s->chroma_intra_matrix[j] = v;
2130
        }
2131
    }
2132
743
    if (get_bits1(&s->gb)) {
2133
54
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2134
    } else {
2135
44785
        for (i = 0; i < 64; i++) {
2136
44096
            int j = s->idsp.idct_permutation[i];
2137
44096
            v = ff_mpeg1_default_non_intra_matrix[i];
2138
44096
            s->inter_matrix[j]        = v;
2139
44096
            s->chroma_inter_matrix[j] = v;
2140
        }
2141
    }
2142
2143
743
    if (show_bits(&s->gb, 23) != 0) {
2144
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2145
        return AVERROR_INVALIDDATA;
2146
    }
2147
2148
743
    s->width  = width;
2149
743
    s->height = height;
2150
2151
    /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2152
743
    s->progressive_sequence = 1;
2153
743
    s->progressive_frame    = 1;
2154
743
    s->picture_structure    = PICT_FRAME;
2155
743
    s->first_field          = 0;
2156
743
    s->frame_pred_frame_dct = 1;
2157
743
    s->chroma_format        = 1;
2158
743
    s->codec_id             =
2159
743
    s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2160
743
    s->out_format           = FMT_MPEG1;
2161
743
    s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
2162
743
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2163
        s->low_delay = 1;
2164
2165
743
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2166
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%"PRId64", aspect_ratio_info: %d \n",
2167
               s1->rc_buffer_size, s->bit_rate, s->aspect_ratio_info);
2168
2169
743
    return 0;
2170
}
2171
2172
2
static int vcr2_init_sequence(AVCodecContext *avctx)
2173
{
2174
2
    Mpeg1Context *s1  = avctx->priv_data;
2175
2
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2176
    int i, v, ret;
2177
2178
    /* start new MPEG-1 context decoding */
2179
2
    s->out_format = FMT_MPEG1;
2180
2
    if (s1->mpeg_enc_ctx_allocated) {
2181
        ff_mpv_common_end(s);
2182
        s1->mpeg_enc_ctx_allocated = 0;
2183
    }
2184
2
    s->width            = avctx->coded_width;
2185
2
    s->height           = avctx->coded_height;
2186
2
    avctx->has_b_frames = 0; // true?
2187
2
    s->low_delay        = 1;
2188
2189
2
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2190
2
    setup_hwaccel_for_pixfmt(avctx);
2191
2192
2
    ff_mpv_idct_init(s);
2193
2
    if ((ret = ff_mpv_common_init(s)) < 0)
2194
        return ret;
2195
2
    s1->mpeg_enc_ctx_allocated = 1;
2196
2197
130
    for (i = 0; i < 64; i++) {
2198
128
        int j = s->idsp.idct_permutation[i];
2199
128
        v = ff_mpeg1_default_intra_matrix[i];
2200
128
        s->intra_matrix[j]        = v;
2201
128
        s->chroma_intra_matrix[j] = v;
2202
2203
128
        v = ff_mpeg1_default_non_intra_matrix[i];
2204
128
        s->inter_matrix[j]        = v;
2205
128
        s->chroma_inter_matrix[j] = v;
2206
    }
2207
2208
2
    s->progressive_sequence  = 1;
2209
2
    s->progressive_frame     = 1;
2210
2
    s->picture_structure     = PICT_FRAME;
2211
2
    s->first_field           = 0;
2212
2
    s->frame_pred_frame_dct  = 1;
2213
2
    s->chroma_format         = 1;
2214
2
    if (s->codec_tag == AV_RL32("BW10")) {
2215
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
2216
    } else {
2217
2
        s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
2218
2
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
2219
    }
2220
2
    s1->save_width           = s->width;
2221
2
    s1->save_height          = s->height;
2222
2
    s1->save_progressive_seq = s->progressive_sequence;
2223
2
    return 0;
2224
}
2225
2226
521
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
2227
                              const uint8_t *p, int buf_size)
2228
{
2229
521
    Mpeg1Context *s1 = avctx->priv_data;
2230
2231
521
    if (buf_size >= 6 &&
2232


521
        p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
2233

277
        p[4] == 3 && (p[5] & 0x40)) {
2234
        /* extract A53 Part 4 CC data */
2235
277
        int cc_count = p[5] & 0x1f;
2236

277
        if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
2237
277
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2238
277
            const uint64_t new_size = (old_size + cc_count
2239
277
                                            * UINT64_C(3));
2240
            int ret;
2241
2242
277
            if (new_size > 3*A53_MAX_CC_COUNT)
2243
                return AVERROR(EINVAL);
2244
2245
277
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2246
277
            if (ret >= 0)
2247
277
                memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
2248
2249
277
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2250
        }
2251
277
        return 1;
2252
244
    } else if (buf_size >= 2 &&
2253

244
               p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
2254
        /* extract SCTE-20 CC data */
2255
        GetBitContext gb;
2256
205
        int cc_count = 0;
2257
        int i, ret;
2258
2259
205
        init_get_bits(&gb, p + 2, buf_size - 2);
2260
205
        cc_count = get_bits(&gb, 5);
2261
205
        if (cc_count > 0) {
2262
205
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2263
205
            const uint64_t new_size = (old_size + cc_count
2264
205
                                            * UINT64_C(3));
2265
205
            if (new_size > 3*A53_MAX_CC_COUNT)
2266
                return AVERROR(EINVAL);
2267
2268
205
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2269
205
            if (ret >= 0) {
2270
                uint8_t field, cc1, cc2;
2271
205
                uint8_t *cap = s1->a53_buf_ref->data;
2272
2273
205
                memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
2274

615
                for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
2275
410
                    skip_bits(&gb, 2); // priority
2276
410
                    field = get_bits(&gb, 2);
2277
410
                    skip_bits(&gb, 5); // line_offset
2278
410
                    cc1 = get_bits(&gb, 8);
2279
410
                    cc2 = get_bits(&gb, 8);
2280
410
                    skip_bits(&gb, 1); // marker
2281
2282
410
                    if (!field) { // forbidden
2283
                        cap[0] = cap[1] = cap[2] = 0x00;
2284
                    } else {
2285
410
                        field = (field == 2 ? 1 : 0);
2286
410
                        if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
2287
410
                        cap[0] = 0x04 | field;
2288
410
                        cap[1] = ff_reverse[cc1];
2289
410
                        cap[2] = ff_reverse[cc2];
2290
                    }
2291
410
                    cap += 3;
2292
                }
2293
            }
2294
205
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2295
        }
2296
205
        return 1;
2297
39
    } else if (buf_size >= 11 &&
2298


39
               p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2299
        /* extract DVD CC data
2300
         *
2301
         * uint32_t   user_data_start_code        0x000001B2    (big endian)
2302
         * uint16_t   user_identifier             0x4343 "CC"
2303
         * uint8_t    user_data_type_code         0x01
2304
         * uint8_t    caption_block_size          0xF8
2305
         * uint8_t
2306
         *   bit 7    caption_odd_field_first     1=odd field (CC1/CC2) first  0=even field (CC3/CC4) first
2307
         *   bit 6    caption_filler              0
2308
         *   bit 5:1  caption_block_count         number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
2309
         *   bit 0    caption_extra_field_added   1=one additional caption word
2310
         *
2311
         * struct caption_field_block {
2312
         *   uint8_t
2313
         *     bit 7:1 caption_filler             0x7F (all 1s)
2314
         *     bit 0   caption_field_odd          1=odd field (this is CC1/CC2)  0=even field (this is CC3/CC4)
2315
         *   uint8_t   caption_first_byte
2316
         *   uint8_t   caption_second_byte
2317
         * } caption_block[(caption_block_count * 2) + caption_extra_field_added];
2318
         *
2319
         * Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
2320
         * correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
2321
         * Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
2322
         * on the even field. There also exist DVDs in the wild that encode an odd field count and the
2323
         * caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
2324
        int cc_count = 0;
2325
        int i, ret;
2326
        // There is a caption count field in the data, but it is often
2327
        // incorrect.  So count the number of captions present.
2328
        for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
2329
            cc_count++;
2330
        // Transform the DVD format into A53 Part 4 format
2331
        if (cc_count > 0) {
2332
            int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
2333
            const uint64_t new_size = (old_size + cc_count
2334
                                            * UINT64_C(6));
2335
            if (new_size > 3*A53_MAX_CC_COUNT)
2336
                return AVERROR(EINVAL);
2337
2338
            ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
2339
            if (ret >= 0) {
2340
                uint8_t field1 = !!(p[4] & 0x80);
2341
                uint8_t *cap = s1->a53_buf_ref->data;
2342
                p += 5;
2343
                for (i = 0; i < cc_count; i++) {
2344
                    cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
2345
                    cap[1] = p[1];
2346
                    cap[2] = p[2];
2347
                    cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
2348
                    cap[4] = p[4];
2349
                    cap[5] = p[5];
2350
                    cap += 6;
2351
                    p += 6;
2352
                }
2353
            }
2354
            avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
2355
        }
2356
        return 1;
2357
    }
2358
39
    return 0;
2359
}
2360
2361
728
static void mpeg_decode_user_data(AVCodecContext *avctx,
2362
                                  const uint8_t *p, int buf_size)
2363
{
2364
728
    Mpeg1Context *s = avctx->priv_data;
2365
728
    const uint8_t *buf_end = p + buf_size;
2366
728
    Mpeg1Context *s1 = avctx->priv_data;
2367
2368
#if 0
2369
    int i;
2370
    for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
2371
        av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
2372
    }
2373
    av_log(avctx, AV_LOG_ERROR, "\n");
2374
#endif
2375
2376
728
    if (buf_size > 29){
2377
        int i;
2378
15288
        for(i=0; i<20; i++)
2379
14560
            if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2380
                s->tmpgexs= 1;
2381
            }
2382
    }
2383
    /* we parse the DTG active format information */
2384
728
    if (buf_end - p >= 5 &&
2385


935
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2386
207
        int flags = p[4];
2387
207
        p += 5;
2388
207
        if (flags & 0x80) {
2389
            /* skip event id */
2390
            p += 2;
2391
        }
2392
207
        if (flags & 0x40) {
2393
207
            if (buf_end - p < 1)
2394
                return;
2395
207
            s1->has_afd = 1;
2396
207
            s1->afd     = p[0] & 0x0f;
2397
        }
2398
521
    } else if (buf_end - p >= 6 &&
2399


521
               p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
2400
               p[4] == 0x03) { // S3D_video_format_length
2401
        // the 0x7F mask ignores the reserved_bit value
2402
        const uint8_t S3D_video_format_type = p[5] & 0x7F;
2403
2404
        if (S3D_video_format_type == 0x03 ||
2405
            S3D_video_format_type == 0x04 ||
2406
            S3D_video_format_type == 0x08 ||
2407
            S3D_video_format_type == 0x23) {
2408
2409
            s1->has_stereo3d = 1;
2410
2411
            switch (S3D_video_format_type) {
2412
            case 0x03:
2413
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2414
                break;
2415
            case 0x04:
2416
                s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2417
                break;
2418
            case 0x08:
2419
                s1->stereo3d.type = AV_STEREO3D_2D;
2420
                break;
2421
            case 0x23:
2422
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2423
                break;
2424
            }
2425
        }
2426
521
    } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
2427
482
        return;
2428
    }
2429
}
2430
2431
514
static void mpeg_decode_gop(AVCodecContext *avctx,
2432
                            const uint8_t *buf, int buf_size)
2433
{
2434
514
    Mpeg1Context *s1  = avctx->priv_data;
2435
514
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2436
    int broken_link;
2437
    int64_t tc;
2438
2439
514
    init_get_bits(&s->gb, buf, buf_size * 8);
2440
2441
514
    tc = s-> timecode_frame_start = get_bits(&s->gb, 25);
2442
2443
#if FF_API_PRIVATE_OPT
2444
FF_DISABLE_DEPRECATION_WARNINGS
2445
514
    avctx->timecode_frame_start = tc;
2446
FF_ENABLE_DEPRECATION_WARNINGS
2447
#endif
2448
2449
514
    s->closed_gop = get_bits1(&s->gb);
2450
    /* broken_link indicates that after editing the
2451
     * reference frames of the first B-Frames after GOP I-Frame
2452
     * are missing (open gop) */
2453
514
    broken_link = get_bits1(&s->gb);
2454
2455
514
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2456
        char tcbuf[AV_TIMECODE_STR_SIZE];
2457
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
2458
        av_log(s->avctx, AV_LOG_DEBUG,
2459
               "GOP (%s) closed_gop=%d broken_link=%d\n",
2460
               tcbuf, s->closed_gop, broken_link);
2461
    }
2462
514
}
2463
2464
4150
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
2465
                         int *got_output, const uint8_t *buf, int buf_size)
2466
{
2467
4150
    Mpeg1Context *s = avctx->priv_data;
2468
4150
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2469
4150
    const uint8_t *buf_ptr = buf;
2470
4150
    const uint8_t *buf_end = buf + buf_size;
2471
    int ret, input_size;
2472
4150
    int last_code = 0, skip_frame = 0;
2473
4150
    int picture_start_code_seen = 0;
2474
2475
197402
    for (;;) {
2476
        /* find next start code */
2477
201552
        uint32_t start_code = -1;
2478
201552
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
2479
201552
        if (start_code > 0x1ff) {
2480
4021
            if (!skip_frame) {
2481
3748
                if (HAVE_THREADS &&
2482
3748
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2483
475
                    !avctx->hwaccel) {
2484
                    int i;
2485
475
                    av_assert0(avctx->thread_count > 1);
2486
2487
475
                    avctx->execute(avctx, slice_decode_thread,
2488
475
                                   &s2->thread_context[0], NULL,
2489
                                   s->slice_count, sizeof(void *));
2490
4723
                    for (i = 0; i < s->slice_count; i++)
2491
4248
                        s2->er.error_count += s2->thread_context[i]->er.error_count;
2492
                }
2493
2494
3748
                ret = slice_end(avctx, picture);
2495
3748
                if (ret < 0)
2496
4150
                    return ret;
2497
3748
                else if (ret) {
2498
                    // FIXME: merge with the stuff in mpeg_decode_slice
2499

3487
                    if (s2->last_picture_ptr || s2->low_delay || s2->pict_type == AV_PICTURE_TYPE_B)
2500
3428
                        *got_output = 1;
2501
                }
2502
            }
2503
4021
            s2->pict_type = 0;
2504
2505

4021
            if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
2506
                return AVERROR_INVALIDDATA;
2507
2508
4021
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
2509
        }
2510
2511
197531
        input_size = buf_end - buf_ptr;
2512
2513
197531
        if (avctx->debug & FF_DEBUG_STARTCODE)
2514
            av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2515
                   start_code, buf_ptr - buf, input_size);
2516
2517
        /* prepare data for next start code */
2518

197531
        switch (start_code) {
2519
743
        case SEQ_START_CODE:
2520
743
            if (last_code == 0) {
2521
743
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2522
743
                if (buf != avctx->extradata)
2523
505
                    s->sync = 1;
2524
            } else {
2525
                av_log(avctx, AV_LOG_ERROR,
2526
                       "ignoring SEQ_START_CODE after %X\n", last_code);
2527
                if (avctx->err_recognition & AV_EF_EXPLODE)
2528
                    return AVERROR_INVALIDDATA;
2529
            }
2530
743
            break;
2531
2532
4584
        case PICTURE_START_CODE:
2533

4584
            if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
2534
               /* If it's a frame picture, there can't be more than one picture header.
2535
                  Yet, it does happen and we need to handle it. */
2536
               av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
2537
               break;
2538
            }
2539
4584
            picture_start_code_seen = 1;
2540
2541

4584
            if (s2->width <= 0 || s2->height <= 0) {
2542
129
                av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
2543
                       s2->width, s2->height);
2544
129
                return AVERROR_INVALIDDATA;
2545
            }
2546
2547
4455
            if (s->tmpgexs){
2548
                s2->intra_dc_precision= 3;
2549
                s2->intra_matrix[0]= 1;
2550
            }
2551
4455
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
2552

478
                !avctx->hwaccel && s->slice_count) {
2553
                int i;
2554
2555
                avctx->execute(avctx, slice_decode_thread,
2556
                               s2->thread_context, NULL,
2557
                               s->slice_count, sizeof(void *));
2558
                for (i = 0; i < s->slice_count; i++)
2559
                    s2->er.error_count += s2->thread_context[i]->er.error_count;
2560
                s->slice_count = 0;
2561
            }
2562

4455
            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
2563
4455
                ret = mpeg_decode_postinit(avctx);
2564
4455
                if (ret < 0) {
2565
                    av_log(avctx, AV_LOG_ERROR,
2566
                           "mpeg_decode_postinit() failure\n");
2567
                    return ret;
2568
                }
2569
2570
                /* We have a complete image: we try to decompress it. */
2571
4455
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
2572
                    s2->pict_type = 0;
2573
4455
                s->first_slice = 1;
2574
4455
                last_code      = PICTURE_START_CODE;
2575
            } else {
2576
                av_log(avctx, AV_LOG_ERROR,
2577
                       "ignoring pic after %X\n", last_code);
2578
                if (avctx->err_recognition & AV_EF_EXPLODE)
2579
                    return AVERROR_INVALIDDATA;
2580
            }
2581
4455
            break;
2582
5383
        case EXT_START_CODE:
2583
5383
            init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2584
2585
5383
            switch (get_bits(&s2->gb, 4)) {
2586
651
            case 0x1:
2587
651
                if (last_code == 0) {
2588
651
                    mpeg_decode_sequence_extension(s);
2589
                } else {
2590
                    av_log(avctx, AV_LOG_ERROR,
2591
                           "ignoring seq ext after %X\n", last_code);
2592
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2593
                        return AVERROR_INVALIDDATA;
2594
                }
2595
651
                break;
2596
65
            case 0x2:
2597
65
                mpeg_decode_sequence_display_extension(s);
2598
65
                break;
2599
691
            case 0x3:
2600
691
                mpeg_decode_quant_matrix_extension(s2);
2601
691
                break;
2602
15
            case 0x7:
2603
15
                mpeg_decode_picture_display_extension(s);
2604
15
                break;
2605
3961
            case 0x8:
2606
3961
                if (last_code == PICTURE_START_CODE) {
2607
3961
                    mpeg_decode_picture_coding_extension(s);
2608
                } else {
2609
                    av_log(avctx, AV_LOG_ERROR,
2610
                           "ignoring pic cod ext after %X\n", last_code);
2611
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2612
                        return AVERROR_INVALIDDATA;
2613
                }
2614
3961
                break;
2615
            }
2616
5383
            break;
2617
728
        case USER_START_CODE:
2618
728
            mpeg_decode_user_data(avctx, buf_ptr, input_size);
2619
728
            break;
2620
514
        case GOP_START_CODE:
2621
514
            if (last_code == 0) {
2622
514
                s2->first_field = 0;
2623
514
                mpeg_decode_gop(avctx, buf_ptr, input_size);
2624
514
                s->sync = 1;
2625
            } else {
2626
                av_log(avctx, AV_LOG_ERROR,
2627
                       "ignoring GOP_START_CODE after %X\n", last_code);
2628
                if (avctx->err_recognition & AV_EF_EXPLODE)
2629
                    return AVERROR_INVALIDDATA;
2630
            }
2631
514
            break;
2632
185579
        default:
2633
185579
            if (start_code >= SLICE_MIN_START_CODE &&
2634

185031
                start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
2635

4455
                if (s2->progressive_sequence && !s2->progressive_frame) {
2636
                    s2->progressive_frame = 1;
2637
                    av_log(s2->avctx, AV_LOG_ERROR,
2638
                           "interlaced frame in progressive sequence, ignoring\n");
2639
                }
2640
2641
4455
                if (s2->picture_structure == 0 ||
2642

4455
                    (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
2643
                    av_log(s2->avctx, AV_LOG_ERROR,
2644
                           "picture_structure %d invalid, ignoring\n",
2645
                           s2->picture_structure);
2646
                    s2->picture_structure = PICT_FRAME;
2647
                }
2648
2649

4455
                if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2650
                    av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
2651
2652
4455
                if (s2->picture_structure == PICT_FRAME) {
2653
3065
                    s2->first_field = 0;
2654
3065
                    s2->v_edge_pos  = 16 * s2->mb_height;
2655
                } else {
2656
1390
                    s2->first_field ^= 1;
2657
1390
                    s2->v_edge_pos   = 8 * s2->mb_height;
2658
1390
                    memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
2659
                }
2660
            }
2661
185579
            if (start_code >= SLICE_MIN_START_CODE &&
2662

185031
                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
2663
184887
                const int field_pic = s2->picture_structure != PICT_FRAME;
2664
184887
                int mb_y = start_code - SLICE_MIN_START_CODE;
2665
184887
                last_code = SLICE_MIN_START_CODE;
2666

184887
                if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2667
                    mb_y += (*buf_ptr&0xE0)<<2;
2668
2669
184887
                mb_y <<= field_pic;
2670
184887
                if (s2->picture_structure == PICT_BOTTOM_FIELD)
2671
10341
                    mb_y++;
2672
2673
184887
                if (buf_end - buf_ptr < 2) {
2674
                    av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
2675
                    return AVERROR_INVALIDDATA;
2676
                }
2677
2678
184887
                if (mb_y >= s2->mb_height) {
2679
                    av_log(s2->avctx, AV_LOG_ERROR,
2680
                           "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2681
                    return AVERROR_INVALIDDATA;
2682
                }
2683
2684
184887
                if (!s2->last_picture_ptr) {
2685
                    /* Skip B-frames if we do not have reference frames and
2686
                     * GOP is not closed. */
2687
77186
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2688
612
                        if (!s2->closed_gop) {
2689
612
                            skip_frame = 1;
2690
612
                            av_log(s2->avctx, AV_LOG_DEBUG,
2691
                                   "Skipping B slice due to open GOP\n");
2692
612
                            break;
2693
                        }
2694
                    }
2695
                }
2696

184275
                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
2697
119316
                    s->sync = 1;
2698
184275
                if (!s2->next_picture_ptr) {
2699
                    /* Skip P-frames if we do not have a reference frame or
2700
                     * we have an invalid header. */
2701

73010
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
2702
3060
                        skip_frame = 1;
2703
3060
                        av_log(s2->avctx, AV_LOG_DEBUG,
2704
                               "Skipping P slice due to !sync\n");
2705
3060
                        break;
2706
                    }
2707
                }
2708
181215
                if ((avctx->skip_frame >= AVDISCARD_NONREF &&
2709
69880
                     s2->pict_type == AV_PICTURE_TYPE_B) ||
2710
181215
                    (avctx->skip_frame >= AVDISCARD_NONKEY &&
2711
69880
                     s2->pict_type != AV_PICTURE_TYPE_I) ||
2712
180598
                    avctx->skip_frame >= AVDISCARD_ALL) {
2713
69880
                    skip_frame = 1;
2714
69880
                    break;
2715
                }
2716
2717
111335
                if (!s->mpeg_enc_ctx_allocated)
2718
                    break;
2719
2720
111335
                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2721
104062
                    if (mb_y < avctx->skip_top ||
2722
104062
                        mb_y >= s2->mb_height - avctx->skip_bottom)
2723
                        break;
2724
                }
2725
2726
111335
                if (!s2->pict_type) {
2727
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
2728
                    if (avctx->err_recognition & AV_EF_EXPLODE)
2729
                        return AVERROR_INVALIDDATA;
2730
                    break;
2731
                }
2732
2733
111335
                if (s->first_slice) {
2734
4089
                    skip_frame     = 0;
2735
4089
                    s->first_slice = 0;
2736
4089
                    if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
2737
                        return ret;
2738
                }
2739
111335
                if (!s2->current_picture_ptr) {
2740
                    av_log(avctx, AV_LOG_ERROR,
2741
                           "current_picture not initialized\n");
2742
                    return AVERROR_INVALIDDATA;
2743
                }
2744
2745
111335
                if (HAVE_THREADS &&
2746
111335
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2747
14160
                    !avctx->hwaccel) {
2748
14160
                    int threshold = (s2->mb_height * s->slice_count +
2749
14160
                                     s2->slice_context_count / 2) /
2750
14160
                                    s2->slice_context_count;
2751
14160
                    av_assert0(avctx->thread_count > 1);
2752
14160
                    if (threshold <= mb_y) {
2753
4248
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];
2754
2755
4248
                        thread_context->start_mb_y = mb_y;
2756
4248
                        thread_context->end_mb_y   = s2->mb_height;
2757
4248
                        if (s->slice_count) {
2758
3776
                            s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
2759
3776
                            ret = ff_update_duplicate_context(thread_context, s2);
2760
3776
                            if (ret < 0)
2761
                                return ret;
2762
                        }
2763
4248
                        init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2764
4248
                        s->slice_count++;
2765
                    }
2766
14160
                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
2767
                } else {
2768
97175
                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
2769
97175
                    emms_c();
2770
2771
97175
                    if (ret < 0) {
2772
4
                        if (avctx->err_recognition & AV_EF_EXPLODE)
2773
                            return ret;
2774

4
                        if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2775
4
                            ff_er_add_slice(&s2->er, s2->resync_mb_x,
2776
                                            s2->resync_mb_y, s2->mb_x, s2->mb_y,
2777
                                            ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2778
                    } else {
2779
97171
                        ff_er_add_slice(&s2->er, s2->resync_mb_x,
2780
97171
                                        s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
2781
                                        ER_AC_END | ER_DC_END | ER_MV_END);
2782
                    }
2783
                }
2784
            }
2785
112027
            break;
2786
        }
2787
    }
2788
}
2789
2790
4068
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
2791
                             int *got_output, AVPacket *avpkt)
2792
{
2793
4068
    const uint8_t *buf = avpkt->data;
2794
    int ret;
2795
4068
    int buf_size = avpkt->size;
2796
4068
    Mpeg1Context *s = avctx->priv_data;
2797
4068
    AVFrame *picture = data;
2798
4068
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2799
2800

4068
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2801
        /* special case for last picture */
2802

131
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
2803
59
            int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2804
59
            if (ret < 0)
2805
                return ret;
2806
2807
59
            s2->next_picture_ptr = NULL;
2808
2809
59
            *got_output = 1;
2810
        }
2811
131
        return buf_size;
2812
    }
2813
2814
3937
    if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2815
49
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
2816
                                           buf_size, NULL);
2817
2818
49
        if (ff_combine_frame(&s2->parse_context, next,
2819
                             (const uint8_t **) &buf, &buf_size) < 0)
2820
25
            return buf_size;
2821
    }
2822
2823
3912
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2824

3912
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
2825
389
                                           || s2->codec_tag == AV_RL32("BW10")
2826
                                          ))
2827
2
        vcr2_init_sequence(avctx);
2828
2829
3912
    s->slice_count = 0;
2830
2831

3912
    if (avctx->extradata && !s->extradata_decoded) {
2832
238
        ret = decode_chunks(avctx, picture, got_output,
2833
238
                            avctx->extradata, avctx->extradata_size);
2834
238
        if (*got_output) {
2835
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
2836
            av_frame_unref(picture);
2837
            *got_output = 0;
2838
        }
2839
238
        s->extradata_decoded = 1;
2840

238
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
2841
            s2->current_picture_ptr = NULL;
2842
            return ret;
2843
        }
2844
    }
2845
2846
3912
    ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
2847

3912
    if (ret<0 || *got_output) {
2848
3557
        s2->current_picture_ptr = NULL;
2849
2850

3557
        if (s2->timecode_frame_start != -1 && *got_output) {
2851
            char tcbuf[AV_TIMECODE_STR_SIZE];
2852
343
            AVFrameSideData *tcside = av_frame_new_side_data(picture,
2853
                                                             AV_FRAME_DATA_GOP_TIMECODE,
2854
                                                             sizeof(int64_t));
2855
343
            if (!tcside)
2856
                return AVERROR(ENOMEM);
2857
343
            memcpy(tcside->data, &s2->timecode_frame_start, sizeof(int64_t));
2858
2859
343
            av_timecode_make_mpeg_tc_string(tcbuf, s2->timecode_frame_start);
2860
343
            av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
2861
2862
343
            s2->timecode_frame_start = -1;
2863
        }
2864
    }
2865
2866
3912
    return ret;
2867
}
2868
2869
static void flush(AVCodecContext *avctx)
2870
{
2871
    Mpeg1Context *s = avctx->priv_data;
2872
2873
    s->sync       = 0;
2874
2875
    ff_mpeg_flush(avctx);
2876
}
2877
2878
259
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2879
{
2880
259
    Mpeg1Context *s = avctx->priv_data;
2881
2882
259
    if (s->mpeg_enc_ctx_allocated)
2883
240
        ff_mpv_common_end(&s->mpeg_enc_ctx);
2884
259
    av_buffer_unref(&s->a53_buf_ref);
2885
259
    return 0;
2886
}
2887
2888
AVCodec ff_mpeg1video_decoder = {
2889
    .name                  = "mpeg1video",
2890
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2891
    .type                  = AVMEDIA_TYPE_VIDEO,
2892
    .id                    = AV_CODEC_ID_MPEG1VIDEO,
2893
    .priv_data_size        = sizeof(Mpeg1Context),
2894
    .init                  = mpeg_decode_init,
2895
    .close                 = mpeg_decode_end,
2896
    .decode                = mpeg_decode_frame,
2897
    .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2898
                             AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2899
                             AV_CODEC_CAP_SLICE_THREADS,
2900
    .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE |
2901
                             FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2902
    .flush                 = flush,
2903
    .max_lowres            = 3,
2904
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context),
2905
    .hw_configs            = (const AVCodecHWConfigInternal *const []) {
2906
#if CONFIG_MPEG1_NVDEC_HWACCEL
2907
                               HWACCEL_NVDEC(mpeg1),
2908
#endif
2909
#if CONFIG_MPEG1_VDPAU_HWACCEL
2910
                               HWACCEL_VDPAU(mpeg1),
2911
#endif
2912
#if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
2913
                               HWACCEL_VIDEOTOOLBOX(mpeg1),
2914
#endif
2915
#if CONFIG_MPEG1_XVMC_HWACCEL
2916
                               HWACCEL_XVMC(mpeg1),
2917
#endif
2918
                               NULL
2919
                           },
2920
};
2921
2922
AVCodec ff_mpeg2video_decoder = {
2923
    .name           = "mpeg2video",
2924
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2925
    .type           = AVMEDIA_TYPE_VIDEO,
2926
    .id             = AV_CODEC_ID_MPEG2VIDEO,
2927
    .priv_data_size = sizeof(Mpeg1Context),
2928
    .init           = mpeg_decode_init,
2929
    .close          = mpeg_decode_end,
2930
    .decode         = mpeg_decode_frame,
2931
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2932
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2933
                      AV_CODEC_CAP_SLICE_THREADS,
2934
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
2935
                      FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2936
    .flush          = flush,
2937
    .max_lowres     = 3,
2938
    .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2939
    .hw_configs     = (const AVCodecHWConfigInternal *const []) {
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_INIT_THREADSAFE |
2980
                      FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2981
    .flush          = flush,
2982
    .max_lowres     = 3,
2983
};
2984
2985
typedef struct IPUContext {
2986
    MpegEncContext m;
2987
2988
    int flags;
2989
    DECLARE_ALIGNED(32, int16_t, block)[6][64];
2990
} IPUContext;
2991
2992
static int ipu_decode_frame(AVCodecContext *avctx, void *data,
2993
                            int *got_frame, AVPacket *avpkt)
2994
{
2995
    IPUContext *s = avctx->priv_data;
2996
    MpegEncContext *m = &s->m;
2997
    GetBitContext *gb = &m->gb;
2998
    AVFrame * const frame = data;
2999
    int ret;
3000
3001
    ret = ff_get_buffer(avctx, frame, 0);
3002
    if (ret < 0)
3003
        return ret;
3004
3005
    ret = init_get_bits8(gb, avpkt->data, avpkt->size);
3006
    if (ret < 0)
3007
        return ret;
3008
3009
    s->flags = get_bits(gb, 8);
3010
    m->intra_dc_precision = s->flags & 3;
3011
    m->q_scale_type = !!(s->flags & 0x40);
3012
    m->intra_vlc_format = !!(s->flags & 0x20);
3013
    m->alternate_scan = !!(s->flags & 0x10);
3014
3015
    if (s->flags & 0x10) {
3016
        ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_alternate_vertical_scan);
3017
        ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_alternate_vertical_scan);
3018
    } else {
3019
        ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_zigzag_direct);
3020
        ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_zigzag_direct);
3021
    }
3022
3023
    m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
3024
    m->qscale = 1;
3025
3026
    for (int y = 0; y < avctx->height; y += 16) {
3027
        int intraquant;
3028
3029
        for (int x = 0; x < avctx->width; x += 16) {
3030
            if (x || y) {
3031
                if (!get_bits1(gb))
3032
                    return AVERROR_INVALIDDATA;
3033
            }
3034
            if (get_bits1(gb)) {
3035
                intraquant = 0;
3036
            } else {
3037
                if (!get_bits1(gb))
3038
                    return AVERROR_INVALIDDATA;
3039
                intraquant = 1;
3040
            }
3041
3042
            if (s->flags & 4)
3043
                skip_bits1(gb);
3044
3045
            if (intraquant)
3046
                m->qscale = mpeg_get_qscale(m);
3047
3048
            memset(s->block, 0, sizeof(s->block));
3049
3050
            for (int n = 0; n < 6; n++) {
3051
                if (s->flags & 0x80) {
3052
                    ret = ff_mpeg1_decode_block_intra(&m->gb,
3053
                                                      m->intra_matrix,
3054
                                                      m->intra_scantable.permutated,
3055
                                                      m->last_dc, s->block[n],
3056
                                                      n, m->qscale);
3057
                    if (ret >= 0)
3058
                        m->block_last_index[n] = ret;
3059
                } else {
3060
                    ret = mpeg2_decode_block_intra(m, s->block[n], n);
3061
                }
3062
3063
                if (ret < 0)
3064
                    return ret;
3065
            }
3066
3067
            m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
3068
                             frame->linesize[0], s->block[0]);
3069
            m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
3070
                             frame->linesize[0], s->block[1]);
3071
            m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
3072
                             frame->linesize[0], s->block[2]);
3073
            m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
3074
                             frame->linesize[0], s->block[3]);
3075
            m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
3076
                             frame->linesize[1], s->block[4]);
3077
            m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
3078
                             frame->linesize[2], s->block[5]);
3079
        }
3080
    }
3081
3082
    align_get_bits(gb);
3083
    if (get_bits_left(gb) != 32)
3084
        return AVERROR_INVALIDDATA;
3085
3086
    frame->pict_type = AV_PICTURE_TYPE_I;
3087
    frame->key_frame = 1;
3088
    *got_frame = 1;
3089
3090
    return avpkt->size;
3091
}
3092
3093
static av_cold int ipu_decode_init(AVCodecContext *avctx)
3094
{
3095
    IPUContext *s = avctx->priv_data;
3096
    MpegEncContext *m = &s->m;
3097
3098
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
3099
3100
    ff_mpv_decode_init(m, avctx);
3101
    ff_mpv_idct_init(m);
3102
    ff_mpeg12_common_init(m);
3103
    ff_mpeg12_init_vlcs();
3104
3105
    for (int i = 0; i < 64; i++) {
3106
        int j = m->idsp.idct_permutation[i];
3107
        int v = ff_mpeg1_default_intra_matrix[i];
3108
        m->intra_matrix[j]        = v;
3109
        m->chroma_intra_matrix[j] = v;
3110
    }
3111
3112
    for (int i = 0; i < 64; i++) {
3113
        int j = m->idsp.idct_permutation[i];
3114
        int v = ff_mpeg1_default_non_intra_matrix[i];
3115
        m->inter_matrix[j]        = v;
3116
        m->chroma_inter_matrix[j] = v;
3117
    }
3118
3119
    return 0;
3120
}
3121
3122
static av_cold int ipu_decode_end(AVCodecContext *avctx)
3123
{
3124
    IPUContext *s = avctx->priv_data;
3125
3126
    ff_mpv_common_end(&s->m);
3127
3128
    return 0;
3129
}
3130
3131
AVCodec ff_ipu_decoder = {
3132
    .name           = "ipu",
3133
    .long_name      = NULL_IF_CONFIG_SMALL("IPU Video"),
3134
    .type           = AVMEDIA_TYPE_VIDEO,
3135
    .id             = AV_CODEC_ID_IPU,
3136
    .priv_data_size = sizeof(IPUContext),
3137
    .init           = ipu_decode_init,
3138
    .decode         = ipu_decode_frame,
3139
    .close          = ipu_decode_end,
3140
    .capabilities   = AV_CODEC_CAP_DR1,
3141
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
3142
};