mpeg12dec.c 104 KB
Newer Older
1 2 3
/*
 * MPEG-1/2 decoder
 * 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 10 11 12
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14 15 16 17 18
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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 21 22 23 24 25 26 27
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * MPEG-1/2 decoder
 */

28
#define UNCHECKED_BITSTREAM_READER 1
29 30
#include <inttypes.h>

31
#include "libavutil/attributes.h"
32
#include "libavutil/internal.h"
33
#include "libavutil/stereo3d.h"
34

35
#include "avcodec.h"
36
#include "bytestream.h"
37
#include "error_resilience.h"
38
#include "idctdsp.h"
39
#include "internal.h"
40
#include "mpeg_er.h"
41 42
#include "mpeg12.h"
#include "mpeg12data.h"
43
#include "mpegutils.h"
44
#include "mpegvideo.h"
45
#include "thread.h"
46
#include "version.h"
47
#include "vdpau_internal.h"
48
#include "xvmc_internal.h"
49

50 51 52
typedef struct Mpeg1Context {
    MpegEncContext mpeg_enc_ctx;
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
53 54
    int repeat_field;           /* true if we must repeat the field */
    AVPanScan pan_scan;         /* some temporary storage for the panscan */
55 56
    AVStereo3D stereo3d;
    int has_stereo3d;
57 58
    uint8_t *a53_caption;
    int a53_caption_size;
59 60 61
    int slice_count;
    int save_aspect_info;
    int save_width, save_height, save_progressive_seq;
62 63
    AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
    int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
64
    int tmpgexs;
65
    int first_slice;
66 67 68
    int extradata_decoded;
} Mpeg1Context;

69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
#define MB_TYPE_ZERO_MV   0x20000000

static const uint32_t ptype2mb_type[7] = {
                    MB_TYPE_INTRA,
                    MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
                    MB_TYPE_L0,
                    MB_TYPE_L0 | MB_TYPE_CBP,
    MB_TYPE_QUANT | MB_TYPE_INTRA,
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
    MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
};

static const uint32_t btype2mb_type[11] = {
                    MB_TYPE_INTRA,
                    MB_TYPE_L1,
                    MB_TYPE_L1   | MB_TYPE_CBP,
                    MB_TYPE_L0,
                    MB_TYPE_L0   | MB_TYPE_CBP,
                    MB_TYPE_L0L1,
                    MB_TYPE_L0L1 | MB_TYPE_CBP,
    MB_TYPE_QUANT | MB_TYPE_INTRA,
    MB_TYPE_QUANT | MB_TYPE_L1   | MB_TYPE_CBP,
    MB_TYPE_QUANT | MB_TYPE_L0   | MB_TYPE_CBP,
    MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
};

static const uint8_t non_linear_qscale[32] = {
96 97 98 99
     0,  1,  2,  3,  4,  5,   6,   7,
     8, 10, 12, 14, 16, 18,  20,  22,
    24, 28, 32, 36, 40, 44,  48,  52,
    56, 64, 72, 80, 88, 96, 104, 112,
100 101
};

102 103 104 105 106 107
/* as H.263, but only 17 codes */
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
{
    int code, sign, val, shift;

    code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
108
    if (code == 0)
109
        return pred;
110
    if (code < 0)
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
        return 0xffff;

    sign  = get_bits1(&s->gb);
    shift = fcode - 1;
    val   = code;
    if (shift) {
        val  = (val - 1) << shift;
        val |= get_bits(&s->gb, shift);
        val++;
    }
    if (sign)
        val = -val;
    val += pred;

    /* modulo decoding */
    return sign_extend(val, 5 + shift);
}

129 130 131 132 133 134 135 136 137 138 139
#define check_scantable_index(ctx, x)                                         \
    do {                                                                      \
        if ((x) > 63) {                                                       \
            av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",     \
                   ctx->mb_x, ctx->mb_y);                                     \
            return AVERROR_INVALIDDATA;                                       \
        }                                                                     \
    } while (0)

static inline int mpeg1_decode_block_intra(MpegEncContext *s,
                                           int16_t *block, int n)
140 141 142
{
    int level, dc, diff, i, j, run;
    int component;
143 144
    RLTable *rl                  = &ff_rl_mpeg1;
    uint8_t *const scantable     = s->intra_scantable.permutated;
145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160
    const uint16_t *quant_matrix = s->intra_matrix;
    const int qscale             = s->qscale;

    /* DC coefficient */
    component = (n <= 3 ? 0 : n - 4 + 1);
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
        return -1;
    dc  = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc * quant_matrix[0];
    av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
    i = 0;
    {
        OPEN_READER(re, &s->gb);
161 162 163 164
        UPDATE_CACHE(re, &s->gb);
        if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
            goto end;

165 166
        /* now quantify & encode AC coefficients */
        for (;;) {
167 168
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
169

170
            if (level != 0) {
171
                i += run;
172
                check_scantable_index(s, i);
173 174 175
                j = scantable[i];
                level = (level * qscale * quant_matrix[j]) >> 4;
                level = (level - 1) | 1;
176 177
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
178
                SKIP_BITS(re, &s->gb, 1);
179 180
            } else {
                /* escape */
181 182
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
183
                UPDATE_CACHE(re, &s->gb);
184 185
                level = SHOW_SBITS(re, &s->gb, 8);
                SKIP_BITS(re, &s->gb, 8);
186
                if (level == -128) {
187
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
188
                    SKIP_BITS(re, &s->gb, 8);
189
                } else if (level == 0) {
190
                    level = SHOW_UBITS(re, &s->gb, 8);
191
                    SKIP_BITS(re, &s->gb, 8);
192 193
                }
                i += run;
194
                check_scantable_index(s, i);
195 196 197 198 199 200 201 202 203 204 205 206 207
                j = scantable[i];
                if (level < 0) {
                    level = -level;
                    level = (level * qscale * quant_matrix[j]) >> 4;
                    level = (level - 1) | 1;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
                    level = (level - 1) | 1;
                }
            }

            block[j] = level;
208 209 210 211
            if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
               break;

            UPDATE_CACHE(re, &s->gb);
212
        }
213 214
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
215 216 217
        CLOSE_READER(re, &s->gb);
    }
    s->block_last_index[n] = i;
218
    return 0;
219 220 221 222 223 224 225
}

int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
{
    return mpeg1_decode_block_intra(s, block, n);
}

226 227
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
                                           int16_t *block, int n)
228 229
{
    int level, i, j, run;
230 231
    RLTable *rl                  = &ff_rl_mpeg1;
    uint8_t *const scantable     = s->intra_scantable.permutated;
232 233 234 235 236 237 238 239
    const uint16_t *quant_matrix = s->inter_matrix;
    const int qscale             = s->qscale;

    {
        OPEN_READER(re, &s->gb);
        i = -1;
        // special case for first coefficient, no need to add second VLC table
        UPDATE_CACHE(re, &s->gb);
240
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
241 242 243 244 245 246 247
            level = (3 * qscale * quant_matrix[0]) >> 5;
            level = (level - 1) | 1;
            if (GET_CACHE(re, &s->gb) & 0x40000000)
                level = -level;
            block[0] = level;
            i++;
            SKIP_BITS(re, &s->gb, 2);
248
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
249 250 251 252
                goto end;
        }
        /* now quantify & encode AC coefficients */
        for (;;) {
253 254
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
255 256 257

            if (level != 0) {
                i += run;
258
                check_scantable_index(s, i);
259 260 261
                j = scantable[i];
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                level = (level - 1) | 1;
262 263
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
264 265 266
                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
267 268
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
269
                UPDATE_CACHE(re, &s->gb);
270 271
                level = SHOW_SBITS(re, &s->gb, 8);
                SKIP_BITS(re, &s->gb, 8);
272
                if (level == -128) {
273 274
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
                    SKIP_BITS(re, &s->gb, 8);
275
                } else if (level == 0) {
276 277
                    level = SHOW_UBITS(re, &s->gb, 8);
                    SKIP_BITS(re, &s->gb, 8);
278 279
                }
                i += run;
280
                check_scantable_index(s, i);
281 282 283 284 285 286 287 288 289 290 291 292 293
                j = scantable[i];
                if (level < 0) {
                    level = -level;
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                    level = (level - 1) | 1;
                    level = -level;
                } else {
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                    level = (level - 1) | 1;
                }
            }

            block[j] = level;
294
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
295 296 297 298 299 300 301 302 303 304 305
                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
    }
    s->block_last_index[n] = i;
    return 0;
}

306 307 308 309 310
/**
 * Note: this function can read out of range and crash for corrupt streams.
 * Changing this would eat up any speed benefits it has.
 * Do not use "fast" flag if you need the code to be robust.
 */
311 312
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
                                                int16_t *block, int n)
313 314
{
    int level, i, j, run;
315 316 317
    RLTable *rl              = &ff_rl_mpeg1;
    uint8_t *const scantable = s->intra_scantable.permutated;
    const int qscale         = s->qscale;
318 319 320 321

    {
        OPEN_READER(re, &s->gb);
        i = -1;
322
        // Special case for first coefficient, no need to add second VLC table.
323
        UPDATE_CACHE(re, &s->gb);
324
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
325 326 327 328 329 330 331
            level = (3 * qscale) >> 1;
            level = (level - 1) | 1;
            if (GET_CACHE(re, &s->gb) & 0x40000000)
                level = -level;
            block[0] = level;
            i++;
            SKIP_BITS(re, &s->gb, 2);
332
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
333 334 335 336 337
                goto end;
        }

        /* now quantify & encode AC coefficients */
        for (;;) {
338 339
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
340 341 342

            if (level != 0) {
                i += run;
343
                check_scantable_index(s, i);
344 345 346
                j = scantable[i];
                level = ((level * 2 + 1) * qscale) >> 1;
                level = (level - 1) | 1;
347 348
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
349 350 351
                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
352 353
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
354
                UPDATE_CACHE(re, &s->gb);
355 356
                level = SHOW_SBITS(re, &s->gb, 8);
                SKIP_BITS(re, &s->gb, 8);
357
                if (level == -128) {
358 359
                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
                    SKIP_BITS(re, &s->gb, 8);
360
                } else if (level == 0) {
361 362
                    level = SHOW_UBITS(re, &s->gb, 8);
                    SKIP_BITS(re, &s->gb, 8);
363 364
                }
                i += run;
365
                check_scantable_index(s, i);
366 367 368 369 370 371 372 373 374 375 376 377 378
                j = scantable[i];
                if (level < 0) {
                    level = -level;
                    level = ((level * 2 + 1) * qscale) >> 1;
                    level = (level - 1) | 1;
                    level = -level;
                } else {
                    level = ((level * 2 + 1) * qscale) >> 1;
                    level = (level - 1) | 1;
                }
            }

            block[j] = level;
379
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
380 381 382 383 384 385 386 387 388 389 390
                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
    }
    s->block_last_index[n] = i;
    return 0;
}

391 392
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
                                               int16_t *block, int n)
393 394 395
{
    int level, i, j, run;
    RLTable *rl = &ff_rl_mpeg1;
396
    uint8_t *const scantable = s->intra_scantable.permutated;
397 398 399 400 401 402 403 404 405 406 407 408 409 410
    const uint16_t *quant_matrix;
    const int qscale = s->qscale;
    int mismatch;

    mismatch = 1;

    {
        OPEN_READER(re, &s->gb);
        i = -1;
        if (n < 4)
            quant_matrix = s->inter_matrix;
        else
            quant_matrix = s->chroma_inter_matrix;

411
        // Special case for first coefficient, no need to add second VLC table.
412
        UPDATE_CACHE(re, &s->gb);
413 414
        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
            level = (3 * qscale * quant_matrix[0]) >> 5;
415 416 417 418 419 420
            if (GET_CACHE(re, &s->gb) & 0x40000000)
                level = -level;
            block[0]  = level;
            mismatch ^= level;
            i++;
            SKIP_BITS(re, &s->gb, 2);
421
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
422 423 424 425 426
                goto end;
        }

        /* now quantify & encode AC coefficients */
        for (;;) {
427 428
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
429 430 431

            if (level != 0) {
                i += run;
432
                check_scantable_index(s, i);
433 434
                j = scantable[i];
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
435 436
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
437 438 439
                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
440 441
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
442
                UPDATE_CACHE(re, &s->gb);
443 444
                level = SHOW_SBITS(re, &s->gb, 12);
                SKIP_BITS(re, &s->gb, 12);
445 446

                i += run;
447
                check_scantable_index(s, i);
448 449 450 451 452 453 454 455 456 457 458
                j = scantable[i];
                if (level < 0) {
                    level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                    level = -level;
                } else {
                    level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                }
            }

            mismatch ^= level;
            block[j]  = level;
459
            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
460 461 462 463 464 465 466 467 468 469 470 471 472
                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
    }
    block[63] ^= (mismatch & 1);

    s->block_last_index[n] = i;
    return 0;
}

473 474 475 476 477
/**
 * Note: this function can read out of range and crash for corrupt streams.
 * Changing this would eat up any speed benefits it has.
 * Do not use "fast" flag if you need the code to be robust.
 */
478 479 480 481
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
                                                    int16_t *block, int n)
{
    int level, i, j, run;
482 483 484
    RLTable *rl              = &ff_rl_mpeg1;
    uint8_t *const scantable = s->intra_scantable.permutated;
    const int qscale         = s->qscale;
485 486 487 488 489
    OPEN_READER(re, &s->gb);
    i = -1;

    // special case for first coefficient, no need to add second VLC table
    UPDATE_CACHE(re, &s->gb);
490
    if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
491 492 493 494 495 496
        level = (3 * qscale) >> 1;
        if (GET_CACHE(re, &s->gb) & 0x40000000)
            level = -level;
        block[0] = level;
        i++;
        SKIP_BITS(re, &s->gb, 2);
497
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
498 499 500 501 502 503 504 505 506
            goto end;
    }

    /* now quantify & encode AC coefficients */
    for (;;) {
        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);

        if (level != 0) {
            i += run;
507
            j = scantable[i];
508
            level = ((level * 2 + 1) * qscale) >> 1;
509 510
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                    SHOW_SBITS(re, &s->gb, 1);
511 512 513
            SKIP_BITS(re, &s->gb, 1);
        } else {
            /* escape */
514 515
            run = SHOW_UBITS(re, &s->gb, 6) + 1;
            LAST_SKIP_BITS(re, &s->gb, 6);
516
            UPDATE_CACHE(re, &s->gb);
517 518
            level = SHOW_SBITS(re, &s->gb, 12);
            SKIP_BITS(re, &s->gb, 12);
519 520

            i += run;
521
            j = scantable[i];
522 523 524 525 526 527 528 529 530
            if (level < 0) {
                level = ((-level * 2 + 1) * qscale) >> 1;
                level = -level;
            } else {
                level = ((level * 2 + 1) * qscale) >> 1;
            }
        }

        block[j] = level;
531
        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF || i > 63)
532
            break;
533

534 535 536 537 538 539 540 541 542
        UPDATE_CACHE(re, &s->gb);
    }
end:
    LAST_SKIP_BITS(re, &s->gb, 2);
    CLOSE_READER(re, &s->gb);
    s->block_last_index[n] = i;
    return 0;
}

543 544
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
                                           int16_t *block, int n)
545 546 547 548
{
    int level, dc, diff, i, j, run;
    int component;
    RLTable *rl;
549
    uint8_t *const scantable = s->intra_scantable.permutated;
550 551 552 553 554 555 556
    const uint16_t *quant_matrix;
    const int qscale = s->qscale;
    int mismatch;

    /* DC coefficient */
    if (n < 4) {
        quant_matrix = s->intra_matrix;
557
        component    = 0;
558 559
    } else {
        quant_matrix = s->chroma_intra_matrix;
560
        component    = (n & 1) + 1;
561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
    }
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
        return -1;
    dc  = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc << (3 - s->intra_dc_precision);
    av_dlog(s->avctx, "dc=%d\n", block[0]);
    mismatch = block[0] ^ 1;
    i = 0;
    if (s->intra_vlc_format)
        rl = &ff_rl_mpeg2;
    else
        rl = &ff_rl_mpeg1;

    {
        OPEN_READER(re, &s->gb);
        /* now quantify & encode AC coefficients */
        for (;;) {
            UPDATE_CACHE(re, &s->gb);
582 583
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
584 585 586 587 588

            if (level == 127) {
                break;
            } else if (level != 0) {
                i += run;
589
                check_scantable_index(s, i);
590
                j = scantable[i];
591
                level = (level * qscale * quant_matrix[j]) >> 4;
592 593
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
594 595 596
                LAST_SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
597 598
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
599
                UPDATE_CACHE(re, &s->gb);
600 601
                level = SHOW_SBITS(re, &s->gb, 12);
                SKIP_BITS(re, &s->gb, 12);
602
                i += run;
603
                check_scantable_index(s, i);
604
                j = scantable[i];
605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623
                if (level < 0) {
                    level = (-level * qscale * quant_matrix[j]) >> 4;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
                }
            }

            mismatch ^= level;
            block[j]  = level;
        }
        CLOSE_READER(re, &s->gb);
    }
    block[63] ^= mismatch & 1;

    s->block_last_index[n] = i;
    return 0;
}

624 625 626 627 628
/**
 * Note: this function can read out of range and crash for corrupt streams.
 * Changing this would eat up any speed benefits it has.
 * Do not use "fast" flag if you need the code to be robust.
 */
629 630
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
                                                int16_t *block, int n)
631
{
632
    int level, dc, diff, i, j, run;
633 634
    int component;
    RLTable *rl;
635
    uint8_t *const scantable = s->intra_scantable.permutated;
636 637 638 639 640 641
    const uint16_t *quant_matrix;
    const int qscale = s->qscale;

    /* DC coefficient */
    if (n < 4) {
        quant_matrix = s->intra_matrix;
642
        component    = 0;
643 644
    } else {
        quant_matrix = s->chroma_intra_matrix;
645
        component    = (n & 1) + 1;
646 647 648 649 650 651 652 653
    }
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
        return -1;
    dc = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc << (3 - s->intra_dc_precision);
654
    i = 0;
655 656 657 658 659 660 661 662 663 664
    if (s->intra_vlc_format)
        rl = &ff_rl_mpeg2;
    else
        rl = &ff_rl_mpeg1;

    {
        OPEN_READER(re, &s->gb);
        /* now quantify & encode AC coefficients */
        for (;;) {
            UPDATE_CACHE(re, &s->gb);
665 666
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
667

668
            if (level >= 64 || i > 63) {
669 670
                break;
            } else if (level != 0) {
671
                i += run;
672
                j = scantable[i];
673
                level = (level * qscale * quant_matrix[j]) >> 4;
674 675
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
676 677 678
                LAST_SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
679 680
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
681
                UPDATE_CACHE(re, &s->gb);
682 683
                level = SHOW_SBITS(re, &s->gb, 12);
                SKIP_BITS(re, &s->gb, 12);
684
                i += run;
685
                j = scantable[i];
686 687 688 689 690 691 692 693 694 695 696 697 698
                if (level < 0) {
                    level = (-level * qscale * quant_matrix[j]) >> 4;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
                }
            }

            block[j] = level;
        }
        CLOSE_READER(re, &s->gb);
    }

699
    s->block_last_index[n] = i;
700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
    return 0;
}

/******************************************/
/* decoding */

static inline int get_dmv(MpegEncContext *s)
{
    if (get_bits1(&s->gb))
        return 1 - (get_bits1(&s->gb) << 1);
    else
        return 0;
}

static inline int get_qscale(MpegEncContext *s)
{
    int qscale = get_bits(&s->gb, 5);
717
    if (s->q_scale_type)
718
        return non_linear_qscale[qscale];
719
    else
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
        return qscale << 1;
}


/* motion type (for MPEG-2) */
#define MT_FIELD 1
#define MT_FRAME 2
#define MT_16X8  2
#define MT_DMV   3

static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
{
    int i, j, k, cbp, val, mb_type, motion_type;
    const int mb_block_count = 4 + (1 << s->chroma_format);

    av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);

737
    av_assert2(s->mb_skipped == 0);
738 739 740 741

    if (s->mb_skip_run-- != 0) {
        if (s->pict_type == AV_PICTURE_TYPE_P) {
            s->mb_skipped = 1;
742 743
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
                MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
744 745 746 747 748 749
        } else {
            int mb_type;

            if (s->mb_x)
                mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
            else
750 751
                // FIXME not sure if this is allowed in MPEG at all
                mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
752 753
            if (IS_INTRA(mb_type)) {
                av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
754
                return -1;
755
            }
756
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
757
                mb_type | MB_TYPE_SKIP;
758

759 760 761 762 763 764 765 766 767 768 769 770
            if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
                s->mb_skipped = 1;
        }

        return 0;
    }

    switch (s->pict_type) {
    default:
    case AV_PICTURE_TYPE_I:
        if (get_bits1(&s->gb) == 0) {
            if (get_bits1(&s->gb) == 0) {
771 772 773
                av_log(s->avctx, AV_LOG_ERROR,
                       "invalid mb type in I Frame at %d %d\n",
                       s->mb_x, s->mb_y);
774 775 776 777 778 779 780 781 782 783
                return -1;
            }
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
        } else {
            mb_type = MB_TYPE_INTRA;
        }
        break;
    case AV_PICTURE_TYPE_P:
        mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
        if (mb_type < 0) {
784 785
            av_log(s->avctx, AV_LOG_ERROR,
                   "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
786 787 788 789 790 791 792
            return -1;
        }
        mb_type = ptype2mb_type[mb_type];
        break;
    case AV_PICTURE_TYPE_B:
        mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
        if (mb_type < 0) {
793 794
            av_log(s->avctx, AV_LOG_ERROR,
                   "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
795 796 797 798 799 800 801 802
            return -1;
        }
        mb_type = btype2mb_type[mb_type];
        break;
    }
    av_dlog(s->avctx, "mb_type=%x\n", mb_type);
//    motion_type = 0; /* avoid warning */
    if (IS_INTRA(mb_type)) {
803
        s->bdsp.clear_blocks(s->block[0]);
804

805
        if (!s->chroma_y_shift)
806
            s->bdsp.clear_blocks(s->block[6]);
807 808

        /* compute DCT type */
809 810 811
        // FIXME: add an interlaced_dct coded var?
        if (s->picture_structure == PICT_FRAME &&
            !s->frame_pred_frame_dct)
812 813 814 815 816 817 818 819
            s->interlaced_dct = get_bits1(&s->gb);

        if (IS_QUANT(mb_type))
            s->qscale = get_qscale(s);

        if (s->concealment_motion_vectors) {
            /* just parse them */
            if (s->picture_structure != PICT_FRAME)
820
                skip_bits1(&s->gb);  /* field select */
821

822 823 824 825 826 827 828 829
            s->mv[0][0][0]      =
            s->last_mv[0][0][0] =
            s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
                                                     s->last_mv[0][0][0]);
            s->mv[0][0][1]      =
            s->last_mv[0][0][1] =
            s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
                                                     s->last_mv[0][0][1]);
830 831

            skip_bits1(&s->gb); /* marker */
832 833 834 835
        } else {
            /* reset mv prediction */
            memset(s->last_mv, 0, sizeof(s->last_mv));
        }
836 837
        s->mb_intra = 1;
        // if 1, we memcpy blocks in xvmcvideo
838
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
839 840 841 842
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks

        if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
            if (s->flags2 & CODEC_FLAG2_FAST) {
843
                for (i = 0; i < 6; i++)
844 845
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
            } else {
846
                for (i = 0; i < mb_block_count; i++)
847 848 849 850
                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
                        return -1;
            }
        } else {
851
            for (i = 0; i < 6; i++)
852 853 854 855 856
                if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
                    return -1;
        }
    } else {
        if (mb_type & MB_TYPE_ZERO_MV) {
857
            av_assert2(mb_type & MB_TYPE_CBP);
858 859 860

            s->mv_dir = MV_DIR_FORWARD;
            if (s->picture_structure == PICT_FRAME) {
861 862
                if (s->picture_structure == PICT_FRAME
                    && !s->frame_pred_frame_dct)
863 864 865
                    s->interlaced_dct = get_bits1(&s->gb);
                s->mv_type = MV_TYPE_16X16;
            } else {
866 867
                s->mv_type            = MV_TYPE_FIELD;
                mb_type              |= MB_TYPE_INTERLACED;
868 869 870 871 872 873 874 875 876 877
                s->field_select[0][0] = s->picture_structure - 1;
            }

            if (IS_QUANT(mb_type))
                s->qscale = get_qscale(s);

            s->last_mv[0][0][0] = 0;
            s->last_mv[0][0][1] = 0;
            s->last_mv[0][1][0] = 0;
            s->last_mv[0][1][1] = 0;
878 879
            s->mv[0][0][0]      = 0;
            s->mv[0][0][1]      = 0;
880
        } else {
881
            av_assert2(mb_type & MB_TYPE_L0L1);
882 883
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
            /* get additional motion vector type */
884
            if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct) {
885
                motion_type = MT_FRAME;
886
            } else {
887 888 889 890 891 892 893 894 895 896 897 898 899 900
                motion_type = get_bits(&s->gb, 2);
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
                    s->interlaced_dct = get_bits1(&s->gb);
            }

            if (IS_QUANT(mb_type))
                s->qscale = get_qscale(s);

            /* motion vectors */
            s->mv_dir = (mb_type >> 13) & 3;
            av_dlog(s->avctx, "motion_type=%d\n", motion_type);
            switch (motion_type) {
            case MT_FRAME: /* or MT_16X8 */
                if (s->picture_structure == PICT_FRAME) {
901
                    mb_type   |= MB_TYPE_16x16;
902 903 904 905
                    s->mv_type = MV_TYPE_16X16;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            /* MT_FRAME */
906 907 908 909 910 911 912 913 914 915
                            s->mv[i][0][0]      =
                            s->last_mv[i][0][0] =
                            s->last_mv[i][1][0] =
                                mpeg_decode_motion(s, s->mpeg_f_code[i][0],
                                                   s->last_mv[i][0][0]);
                            s->mv[i][0][1]      =
                            s->last_mv[i][0][1] =
                            s->last_mv[i][1][1] =
                                mpeg_decode_motion(s, s->mpeg_f_code[i][1],
                                                   s->last_mv[i][0][1]);
916 917 918 919 920 921 922 923
                            /* full_pel: only for MPEG-1 */
                            if (s->full_pel[i]) {
                                s->mv[i][0][0] <<= 1;
                                s->mv[i][0][1] <<= 1;
                            }
                        }
                    }
                } else {
924
                    mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
                    s->mv_type = MV_TYPE_16X8;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            /* MT_16X8 */
                            for (j = 0; j < 2; j++) {
                                s->field_select[i][j] = get_bits1(&s->gb);
                                for (k = 0; k < 2; k++) {
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
                                                             s->last_mv[i][j][k]);
                                    s->last_mv[i][j][k] = val;
                                    s->mv[i][j][k]      = val;
                                }
                            }
                        }
                    }
                }
                break;
            case MT_FIELD:
                s->mv_type = MV_TYPE_FIELD;
                if (s->picture_structure == PICT_FRAME) {
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            for (j = 0; j < 2; j++) {
                                s->field_select[i][j] = get_bits1(&s->gb);
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
                                                         s->last_mv[i][j][0]);
                                s->last_mv[i][j][0] = val;
                                s->mv[i][j][0]      = val;
                                av_dlog(s->avctx, "fmx=%d\n", val);
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
                                                         s->last_mv[i][j][1] >> 1);
                                s->last_mv[i][j][1] = val << 1;
                                s->mv[i][j][1]      = val;
                                av_dlog(s->avctx, "fmy=%d\n", val);
                            }
                        }
                    }
                } else {
964
                    av_assert0(!s->progressive_sequence);
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
                    mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            s->field_select[i][0] = get_bits1(&s->gb);
                            for (k = 0; k < 2; k++) {
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
                                                         s->last_mv[i][0][k]);
                                s->last_mv[i][0][k] = val;
                                s->last_mv[i][1][k] = val;
                                s->mv[i][0][k]      = val;
                            }
                        }
                    }
                }
                break;
            case MT_DMV:
981
                if (s->progressive_sequence){
982 983 984
                    av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
                    return -1;
                }
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
                s->mv_type = MV_TYPE_DMV;
                for (i = 0; i < 2; i++) {
                    if (USES_LIST(mb_type, i)) {
                        int dmx, dmy, mx, my, m;
                        const int my_shift = s->picture_structure == PICT_FRAME;

                        mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
                                                s->last_mv[i][0][0]);
                        s->last_mv[i][0][0] = mx;
                        s->last_mv[i][1][0] = mx;
                        dmx = get_dmv(s);
                        my  = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
                                                 s->last_mv[i][0][1] >> my_shift);
                        dmy = get_dmv(s);


                        s->last_mv[i][0][1] = my << my_shift;
                        s->last_mv[i][1][1] = my << my_shift;

                        s->mv[i][0][0] = mx;
                        s->mv[i][0][1] = my;
                        s->mv[i][1][0] = mx; // not used
                        s->mv[i][1][1] = my; // not used

                        if (s->picture_structure == PICT_FRAME) {
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;

                            // m = 1 + 2 * s->top_field_first;
                            m = s->top_field_first ? 1 : 3;

                            /* top -> top pred */
                            s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
                            s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
                            m = 4 - m;
                            s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
                            s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
                        } else {
                            mb_type |= MB_TYPE_16x16;

                            s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
                            s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
                            if (s->picture_structure == PICT_TOP_FIELD)
                                s->mv[i][2][1]--;
                            else
                                s->mv[i][2][1]++;
                        }
                    }
                }
                break;
            default:
1035 1036
                av_log(s->avctx, AV_LOG_ERROR,
                       "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
1037 1038 1039 1040 1041 1042
                return -1;
            }
        }

        s->mb_intra = 0;
        if (HAS_CBP(mb_type)) {
1043
            s->bdsp.clear_blocks(s->block[0]);
1044 1045 1046

            cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
            if (mb_block_count > 6) {
1047 1048
                cbp <<= mb_block_count - 6;
                cbp  |= get_bits(&s->gb, mb_block_count - 6);
1049
                s->bdsp.clear_blocks(s->block[6]);
1050 1051
            }
            if (cbp <= 0) {
1052
                av_log(s->avctx, AV_LOG_ERROR,
1053
                       "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
1054 1055 1056
                return -1;
            }

1057
            // if 1, we memcpy blocks in xvmcvideo
1058
            if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1059 1060 1061 1062 1063
                ff_xvmc_pack_pblocks(s, cbp);

            if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
                if (s->flags2 & CODEC_FLAG2_FAST) {
                    for (i = 0; i < 6; i++) {
1064
                        if (cbp & 32)
1065
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1066
                        else
1067 1068 1069 1070
                            s->block_last_index[i] = -1;
                        cbp += cbp;
                    }
                } else {
1071
                    cbp <<= 12 - mb_block_count;
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085

                    for (i = 0; i < mb_block_count; i++) {
                        if (cbp & (1 << 11)) {
                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
                                return -1;
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                }
            } else {
                if (s->flags2 & CODEC_FLAG2_FAST) {
                    for (i = 0; i < 6; i++) {
1086
                        if (cbp & 32)
1087
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1088
                        else
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
                            s->block_last_index[i] = -1;
                        cbp += cbp;
                    }
                } else {
                    for (i = 0; i < 6; i++) {
                        if (cbp & 32) {
                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
                                return -1;
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                }
            }
        } else {
            for (i = 0; i < 12; i++)
                s->block_last_index[i] = -1;
        }
    }

    s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;

    return 0;
}

static av_cold int mpeg_decode_init(AVCodecContext *avctx)
{
1117
    Mpeg1Context *s    = avctx->priv_data;
1118 1119 1120 1121 1122 1123
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
    int i;

    /* we need some permutation to store matrices,
     * until MPV_common_init() sets the real permutation. */
    for (i = 0; i < 64; i++)
1124
        s2->idsp.idct_permutation[i] = i;
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137

    ff_MPV_decode_defaults(s2);

    s->mpeg_enc_ctx.avctx  = avctx;
    s->mpeg_enc_ctx.flags  = avctx->flags;
    s->mpeg_enc_ctx.flags2 = avctx->flags2;
    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
    ff_mpeg12_init_vlcs();

    s->mpeg_enc_ctx_allocated      = 0;
    s->mpeg_enc_ctx.picture_number = 0;
    s->repeat_field                = 0;
    s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
1138
    avctx->color_range             = AVCOL_RANGE_MPEG;
1139 1140 1141 1142 1143 1144 1145
    if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
    else
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
    return 0;
}

1146 1147
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
                                             const AVCodecContext *avctx_from)
1148 1149 1150 1151 1152
{
    Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
    MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
    int err;

1153 1154 1155
    if (avctx == avctx_from               ||
        !ctx_from->mpeg_enc_ctx_allocated ||
        !s1->context_initialized)
1156 1157 1158
        return 0;

    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1159 1160
    if (err)
        return err;
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178

    if (!ctx->mpeg_enc_ctx_allocated)
        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));

    if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
        s->picture_number++;

    return 0;
}

static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
                                 const uint8_t *new_perm)
{
    uint16_t temp_matrix[64];
    int i;

    memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));

1179
    for (i = 0; i < 64; i++)
1180 1181 1182
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
}

1183
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1184 1185
#if CONFIG_MPEG1_XVMC_HWACCEL
    AV_PIX_FMT_XVMC,
1186 1187 1188
#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL
    AV_PIX_FMT_VDPAU_MPEG1,
1189
    AV_PIX_FMT_VDPAU,
1190 1191 1192 1193
#endif
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_NONE
};
1194

1195
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
1196 1197
#if CONFIG_MPEG2_XVMC_HWACCEL
    AV_PIX_FMT_XVMC,
1198 1199 1200
#endif
#if CONFIG_MPEG2_VDPAU_HWACCEL
    AV_PIX_FMT_VDPAU_MPEG2,
1201
    AV_PIX_FMT_VDPAU,
1202
#endif
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
#if CONFIG_MPEG2_DXVA2_HWACCEL
    AV_PIX_FMT_DXVA2_VLD,
#endif
#if CONFIG_MPEG2_VAAPI_HWACCEL
    AV_PIX_FMT_VAAPI_VLD,
#endif
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_NONE
};

1213 1214 1215 1216
static inline int uses_vdpau(AVCodecContext *avctx) {
    return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
}

1217 1218
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
{
1219
    Mpeg1Context *s1  = avctx->priv_data;
1220 1221
    MpegEncContext *s = &s1->mpeg_enc_ctx;

1222
    if (s->chroma_format < 2)
1223
        return ff_thread_get_format(avctx,
1224 1225 1226
                                avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
                                mpeg1_hwaccel_pixfmt_list_420 :
                                mpeg2_hwaccel_pixfmt_list_420);
1227
    else if (s->chroma_format == 2)
1228 1229 1230 1231 1232 1233 1234 1235
        return AV_PIX_FMT_YUV422P;
    else
        return AV_PIX_FMT_YUV444P;
}

static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
{
    // until then pix_fmt may be changed right after codec init
1236
    if (avctx->hwaccel || uses_vdpau(avctx))
1237 1238
        if (avctx->idct_algo == FF_IDCT_AUTO)
            avctx->idct_algo = FF_IDCT_SIMPLE;
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248

    if (avctx->hwaccel && avctx->pix_fmt == AV_PIX_FMT_XVMC) {
        Mpeg1Context *s1 = avctx->priv_data;
        MpegEncContext *s = &s1->mpeg_enc_ctx;

        s->pack_pblocks = 1;
#if FF_API_XVMC
        avctx->xvmc_acceleration = 2;
#endif /* FF_API_XVMC */
    }
1249 1250 1251 1252 1253 1254
}

/* Call this function when we know all parameters.
 * It may be called in different places for MPEG-1 and MPEG-2. */
static int mpeg_decode_postinit(AVCodecContext *avctx)
{
1255
    Mpeg1Context *s1  = avctx->priv_data;
1256 1257
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    uint8_t old_permutation[64];
1258
    int ret;
1259

1260 1261 1262
    if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
        avctx->coded_width       != s->width                ||
        avctx->coded_height      != s->height               ||
1263 1264 1265
        s1->save_width           != s->width                ||
        s1->save_height          != s->height               ||
        s1->save_aspect_info     != s->aspect_ratio_info    ||
1266
        (s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
1267
        0) {
1268 1269 1270 1271 1272
        if (s1->mpeg_enc_ctx_allocated) {
            ParseContext pc = s->parse_context;
            s->parse_context.buffer = 0;
            ff_MPV_common_end(s);
            s->parse_context = pc;
1273
            s1->mpeg_enc_ctx_allocated = 0;
1274 1275 1276 1277 1278
        }

        if ((s->width == 0) || (s->height == 0))
            return -2;

1279 1280 1281 1282
        ret = ff_set_dimensions(avctx, s->width, s->height);
        if (ret < 0)
            return ret;

1283 1284 1285 1286 1287 1288
        if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
            avctx->rc_max_rate = s->bit_rate;
        } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
                   (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
            avctx->bit_rate = s->bit_rate;
        }
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
        s1->save_aspect_info     = s->aspect_ratio_info;
        s1->save_width           = s->width;
        s1->save_height          = s->height;
        s1->save_progressive_seq = s->progressive_sequence;

        /* low_delay may be forced, in this case we will have B-frames
         * that behave like P-frames. */
        avctx->has_b_frames = !s->low_delay;

        if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
1299
            // MPEG-1 fps
1300 1301
            avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
            avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
1302 1303 1304 1305 1306
            // MPEG-1 aspect
            avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
            avctx->ticks_per_frame     = 1;
        } else { // MPEG-2
            // MPEG-2 fps
1307 1308
            av_reduce(&s->avctx->time_base.den,
                      &s->avctx->time_base.num,
1309
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1310 1311 1312
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
                      1 << 30);
            avctx->ticks_per_frame = 2;
1313
            // MPEG-2 aspect
1314 1315 1316
            if (s->aspect_ratio_info > 1) {
                AVRational dar =
                    av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1317 1318 1319 1320 1321 1322 1323 1324
                                      (AVRational) { s1->pan_scan.width,
                                                     s1->pan_scan.height }),
                             (AVRational) { s->width, s->height });

                /* We ignore the spec here and guess a bit as reality does not
                 * match the spec, see for example res_change_ffmpeg_aspect.ts
                 * and sequence-display-aspect.mpg.
                 * issue1613, 621, 562 */
1325
                if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1326 1327
                    (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
                     av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1328 1329
                    s->avctx->sample_aspect_ratio =
                        av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1330
                                 (AVRational) { s->width, s->height });
1331 1332 1333
                } else {
                    s->avctx->sample_aspect_ratio =
                        av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1334 1335 1336 1337
                                 (AVRational) { s1->pan_scan.width, s1->pan_scan.height });
// issue1613 4/3 16/9 -> 16/9
// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
// widescreen-issue562.mpg 4/3 16/9 -> 16/9
1338 1339
//                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
                    av_dlog(avctx, "A %d/%d\n",
1340 1341
                            ff_mpeg2_aspect[s->aspect_ratio_info].num,
                            ff_mpeg2_aspect[s->aspect_ratio_info].den);
1342 1343 1344 1345 1346 1347 1348 1349 1350
                    av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
                            s->avctx->sample_aspect_ratio.den);
                }
            } else {
                s->avctx->sample_aspect_ratio =
                    ff_mpeg2_aspect[s->aspect_ratio_info];
            }
        } // MPEG-2

1351 1352
        ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);

1353
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1354
        setup_hwaccel_for_pixfmt(avctx);
1355 1356 1357

        /* Quantization matrices may need reordering
         * if DCT permutation is changed. */
1358
        memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1359 1360 1361 1362

        if (ff_MPV_common_init(s) < 0)
            return -2;

1363 1364 1365 1366
        quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->idsp.idct_permutation);
        quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->idsp.idct_permutation);
        quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
        quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
1367 1368 1369 1370 1371 1372

        s1->mpeg_enc_ctx_allocated = 1;
    }
    return 0;
}

1373 1374
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
                                int buf_size)
1375
{
1376
    Mpeg1Context *s1  = avctx->priv_data;
1377 1378 1379
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int ref, f_code, vbv_delay;

1380
    init_get_bits(&s->gb, buf, buf_size * 8);
1381 1382 1383 1384 1385 1386 1387

    ref = get_bits(&s->gb, 10); /* temporal ref */
    s->pict_type = get_bits(&s->gb, 3);
    if (s->pict_type == 0 || s->pict_type > 3)
        return -1;

    vbv_delay = get_bits(&s->gb, 16);
1388
    s->vbv_delay = vbv_delay;
1389 1390
    if (s->pict_type == AV_PICTURE_TYPE_P ||
        s->pict_type == AV_PICTURE_TYPE_B) {
1391 1392
        s->full_pel[0] = get_bits1(&s->gb);
        f_code = get_bits(&s->gb, 3);
1393
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1394
            return -1;
1395
        f_code += !f_code;
1396 1397 1398 1399 1400 1401
        s->mpeg_f_code[0][0] = f_code;
        s->mpeg_f_code[0][1] = f_code;
    }
    if (s->pict_type == AV_PICTURE_TYPE_B) {
        s->full_pel[1] = get_bits1(&s->gb);
        f_code = get_bits(&s->gb, 3);
1402
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1403
            return -1;
1404
        f_code += !f_code;
1405 1406 1407
        s->mpeg_f_code[1][0] = f_code;
        s->mpeg_f_code[1][1] = f_code;
    }
1408 1409
    s->current_picture.f->pict_type = s->pict_type;
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1410 1411

    if (avctx->debug & FF_DEBUG_PICT_INFO)
1412 1413
        av_log(avctx, AV_LOG_DEBUG,
               "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1414 1415 1416 1417 1418 1419 1420 1421

    s->y_dc_scale = 8;
    s->c_dc_scale = 8;
    return 0;
}

static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
{
1422
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1423 1424 1425 1426 1427 1428
    int horiz_size_ext, vert_size_ext;
    int bit_rate_ext;

    skip_bits(&s->gb, 1); /* profile and level esc*/
    s->avctx->profile       = get_bits(&s->gb, 3);
    s->avctx->level         = get_bits(&s->gb, 4);
1429
    s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
    s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
    horiz_size_ext          = get_bits(&s->gb, 2);
    vert_size_ext           = get_bits(&s->gb, 2);
    s->width  |= (horiz_size_ext << 12);
    s->height |= (vert_size_ext  << 12);
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
    s->bit_rate += (bit_rate_ext << 18) * 400;
    skip_bits1(&s->gb); /* marker */
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;

    s->low_delay = get_bits1(&s->gb);
    if (s->flags & CODEC_FLAG_LOW_DELAY)
        s->low_delay = 1;

    s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
    s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;

    av_dlog(s->avctx, "sequence extension\n");
1448
    s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1449 1450

    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1451
        av_log(s->avctx, AV_LOG_DEBUG,
1452 1453
               "profile: %d, level: %d ps: %d cf:%d vbv buffer: %d, bitrate:%d\n",
               s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
1454
               s->avctx->rc_buffer_size, s->bit_rate);
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
}

static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
{
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int color_description, w, h;

    skip_bits(&s->gb, 3); /* video format */
    color_description = get_bits1(&s->gb);
    if (color_description) {
        s->avctx->color_primaries = get_bits(&s->gb, 8);
        s->avctx->color_trc       = get_bits(&s->gb, 8);
        s->avctx->colorspace      = get_bits(&s->gb, 8);
    }
    w = get_bits(&s->gb, 14);
1470
    skip_bits(&s->gb, 1); // marker
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507
    h = get_bits(&s->gb, 14);
    // remaining 3 bits are zero padding

    s1->pan_scan.width  = 16 * w;
    s1->pan_scan.height = 16 * h;

    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
}

static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
{
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int i, nofco;

    nofco = 1;
    if (s->progressive_sequence) {
        if (s->repeat_first_field) {
            nofco++;
            if (s->top_field_first)
                nofco++;
        }
    } else {
        if (s->picture_structure == PICT_FRAME) {
            nofco++;
            if (s->repeat_first_field)
                nofco++;
        }
    }
    for (i = 0; i < nofco; i++) {
        s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
        skip_bits(&s->gb, 1); // marker
        s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
        skip_bits(&s->gb, 1); // marker
    }

    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1508 1509
        av_log(s->avctx, AV_LOG_DEBUG,
               "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1510 1511 1512 1513 1514
               s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
               s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
               s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
}

1515 1516
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
                       uint16_t matrix1[64], int intra)
1517 1518 1519 1520
{
    int i;

    for (i = 0; i < 64; i++) {
1521
        int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1522 1523 1524 1525 1526 1527
        int v = get_bits(&s->gb, 8);
        if (v == 0) {
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
            return -1;
        }
        if (intra && i == 0 && v != 8) {
1528
            av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541
            v = 8; // needed by pink.mpg / issue1046
        }
        matrix0[j] = v;
        if (matrix1)
            matrix1[j] = v;
    }
    return 0;
}

static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
{
    av_dlog(s->avctx, "matrix extension\n");

1542 1543 1544 1545 1546 1547 1548 1549
    if (get_bits1(&s->gb))
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
    if (get_bits1(&s->gb))
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
    if (get_bits1(&s->gb))
        load_matrix(s, s->chroma_intra_matrix, NULL, 1);
    if (get_bits1(&s->gb))
        load_matrix(s, s->chroma_inter_matrix, NULL, 0);
1550 1551 1552 1553 1554 1555
}

static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
{
    MpegEncContext *s = &s1->mpeg_enc_ctx;

1556
    s->full_pel[0]       = s->full_pel[1] = 0;
1557 1558 1559 1560 1561
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
    if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1562 1563
        av_log(s->avctx, AV_LOG_ERROR,
               "Missing picture start code, guessing missing values\n");
1564 1565 1566 1567 1568 1569 1570
        if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
            if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
                s->pict_type = AV_PICTURE_TYPE_I;
            else
                s->pict_type = AV_PICTURE_TYPE_P;
        } else
            s->pict_type = AV_PICTURE_TYPE_B;
1571 1572
        s->current_picture.f->pict_type = s->pict_type;
        s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1573
    }
1574 1575 1576 1577 1578
    s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
    s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
    s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
    s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];

1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
    s->intra_dc_precision         = get_bits(&s->gb, 2);
    s->picture_structure          = get_bits(&s->gb, 2);
    s->top_field_first            = get_bits1(&s->gb);
    s->frame_pred_frame_dct       = get_bits1(&s->gb);
    s->concealment_motion_vectors = get_bits1(&s->gb);
    s->q_scale_type               = get_bits1(&s->gb);
    s->intra_vlc_format           = get_bits1(&s->gb);
    s->alternate_scan             = get_bits1(&s->gb);
    s->repeat_first_field         = get_bits1(&s->gb);
    s->chroma_420_type            = get_bits1(&s->gb);
    s->progressive_frame          = get_bits1(&s->gb);

    if (s->alternate_scan) {
1592 1593
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
1594
    } else {
1595 1596
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
    }

    /* composite display not parsed */
    av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
    av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
    av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
    av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
    av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
    av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
    av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
    av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
    av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
}

static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
{
    AVCodecContext *avctx = s->avctx;
1614
    Mpeg1Context *s1      = (Mpeg1Context *) s;
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625

    /* start frame decoding */
    if (s->first_field || s->picture_structure == PICT_FRAME) {
        AVFrameSideData *pan_scan;

        if (ff_MPV_frame_start(s, avctx) < 0)
            return -1;

        ff_mpeg_er_frame_start(s);

        /* first check if we must repeat the frame */
1626
        s->current_picture_ptr->f->repeat_pict = 0;
1627 1628 1629
        if (s->repeat_first_field) {
            if (s->progressive_sequence) {
                if (s->top_field_first)
1630
                    s->current_picture_ptr->f->repeat_pict = 4;
1631
                else
1632
                    s->current_picture_ptr->f->repeat_pict = 2;
1633
            } else if (s->progressive_frame) {
1634
                s->current_picture_ptr->f->repeat_pict = 1;
1635 1636 1637
            }
        }

1638
        pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1639 1640 1641 1642 1643 1644
                                          AV_FRAME_DATA_PANSCAN,
                                          sizeof(s1->pan_scan));
        if (!pan_scan)
            return AVERROR(ENOMEM);
        memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));

1645 1646
        if (s1->a53_caption) {
            AVFrameSideData *sd = av_frame_new_side_data(
1647
                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1648 1649 1650 1651 1652
                s1->a53_caption_size);
            if (sd)
                memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
            av_freep(&s1->a53_caption);
        }
1653 1654

        if (s1->has_stereo3d) {
1655
            AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1656 1657 1658 1659 1660 1661
            if (!stereo)
                return AVERROR(ENOMEM);

            *stereo = s1->stereo3d;
            s1->has_stereo3d = 0;
        }
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
            ff_thread_finish_setup(avctx);
    } else { // second field
        int i;

        if (!s->current_picture_ptr) {
            av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
            return -1;
        }

        if (s->avctx->hwaccel &&
            (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
            if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1675 1676
                av_log(avctx, AV_LOG_ERROR,
                       "hardware accelerator failed to decode first field\n");
1677 1678 1679
        }

        for (i = 0; i < 4; i++) {
1680
            s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1681
            if (s->picture_structure == PICT_BOTTOM_FIELD)
1682 1683
                s->current_picture.f->data[i] +=
                    s->current_picture_ptr->f->linesize[i];
1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
        }
    }

    if (avctx->hwaccel) {
        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
            return -1;
    }

    return 0;
}

#define DECODE_SLICE_ERROR -1
#define DECODE_SLICE_OK     0

/**
 * Decode a slice.
 * MpegEncContext.mb_y must be set to the MB row from the startcode.
 * @return DECODE_SLICE_ERROR if the slice is damaged,
 *         DECODE_SLICE_OK if this slice is OK
 */
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
                             const uint8_t **buf, int buf_size)
{
    AVCodecContext *avctx = s->avctx;
1708
    const int lowres      = s->avctx->lowres;
1709 1710 1711 1712 1713
    const int field_pic   = s->picture_structure != PICT_FRAME;

    s->resync_mb_x =
    s->resync_mb_y = -1;

1714
    av_assert0(mb_y < s->mb_height);
1715 1716

    init_get_bits(&s->gb, *buf, buf_size * 8);
1717
    if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1718
        skip_bits(&s->gb, 3);
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730

    ff_mpeg1_clean_buffers(s);
    s->interlaced_dct = 0;

    s->qscale = get_qscale(s);

    if (s->qscale == 0) {
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
        return -1;
    }

    /* extra slice info */
1731 1732
    if (skip_1stop_8data_bits(&s->gb) < 0)
        return AVERROR_INVALIDDATA;
1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746

    s->mb_x = 0;

    if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
        skip_bits1(&s->gb);
    } else {
        while (get_bits_left(&s->gb) > 0) {
            int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
                                MBINCR_VLC_BITS, 2);
            if (code < 0) {
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
                return -1;
            }
            if (code >= 33) {
1747
                if (code == 33)
1748 1749 1750 1751 1752 1753 1754 1755 1756
                    s->mb_x += 33;
                /* otherwise, stuffing, nothing to do */
            } else {
                s->mb_x += code;
                break;
            }
        }
    }

1757
    if (s->mb_x >= (unsigned) s->mb_width) {
1758 1759 1760 1761
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
        return -1;
    }

1762
    if (avctx->hwaccel && avctx->hwaccel->decode_slice) {
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
        int start_code = -1;
        buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
        if (buf_end < *buf + buf_size)
            buf_end -= 4;
        s->mb_y = mb_y;
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
            return DECODE_SLICE_ERROR;
        *buf = buf_end;
        return DECODE_SLICE_OK;
    }

    s->resync_mb_x = s->mb_x;
    s->resync_mb_y = s->mb_y = mb_y;
    s->mb_skip_run = 0;
    ff_init_block_index(s);

    if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
            av_log(s->avctx, AV_LOG_DEBUG,
                   "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",
                   s->qscale,
                   s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
                   s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
                   s->pict_type  == AV_PICTURE_TYPE_I ? "I" :
                   (s->pict_type == AV_PICTURE_TYPE_P ? "P" :
                   (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
                   s->progressive_sequence ? "ps"  : "",
                   s->progressive_frame    ? "pf"  : "",
                   s->alternate_scan       ? "alt" : "",
                   s->top_field_first      ? "top" : "",
                   s->intra_dc_precision, s->picture_structure,
                   s->frame_pred_frame_dct, s->concealment_motion_vectors,
                   s->q_scale_type, s->intra_vlc_format,
                   s->repeat_first_field, s->chroma_420_type ? "420" : "");
1798 1799 1800 1801 1802
        }
    }

    for (;;) {
        // If 1, we memcpy blocks in xvmcvideo.
1803
        if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
1804 1805 1806 1807 1808
            ff_xvmc_init_block(s); // set s->block

        if (mpeg_decode_mb(s, s->block) < 0)
            return -1;

1809 1810
        // Note motion_val is normally NULL unless we want to extract the MVs.
        if (s->current_picture.motion_val[0] && !s->encoding) {
1811 1812 1813 1814 1815 1816 1817
            const int wrap = s->b8_stride;
            int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
            int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
            int motion_x, motion_y, dir, i;

            for (i = 0; i < 2; i++) {
                for (dir = 0; dir < 2; dir++) {
1818 1819
                    if (s->mb_intra ||
                        (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1820
                        motion_x = motion_y = 0;
1821 1822
                    } else if (s->mv_type == MV_TYPE_16X16 ||
                               (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1823 1824
                        motion_x = s->mv[dir][0][0];
                        motion_y = s->mv[dir][0][1];
1825
                    } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1826 1827 1828 1829
                        motion_x = s->mv[dir][i][0];
                        motion_y = s->mv[dir][i][1];
                    }

1830 1831
                    s->current_picture.motion_val[dir][xy][0]     = motion_x;
                    s->current_picture.motion_val[dir][xy][1]     = motion_y;
1832 1833
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1834
                    s->current_picture.ref_index [dir][b8_xy]     =
1835
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1836 1837
                    av_assert2(s->field_select[dir][i] == 0 ||
                               s->field_select[dir][i] == 1);
1838
                }
1839 1840
                xy    += wrap;
                b8_xy += 2;
1841 1842 1843
            }
        }

1844 1845 1846
        s->dest[0] += 16 >> lowres;
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1847 1848 1849 1850

        ff_MPV_decode_mb(s, s->block);

        if (++s->mb_x >= s->mb_width) {
1851
            const int mb_size = 16 >> s->avctx->lowres;
1852

1853
            ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1854 1855
            ff_MPV_report_decode_progress(s);

1856
            s->mb_x  = 0;
1857 1858 1859 1860
            s->mb_y += 1 << field_pic;

            if (s->mb_y >= s->mb_height) {
                int left   = get_bits_left(&s->gb);
1861 1862 1863 1864 1865 1866 1867
                int is_d10 = s->chroma_format == 2 &&
                             s->pict_type == AV_PICTURE_TYPE_I &&
                             avctx->profile == 0 && avctx->level == 5 &&
                             s->intra_dc_precision == 2 &&
                             s->q_scale_type == 1 && s->alternate_scan == 0 &&
                             s->progressive_frame == 0
                             /* vbv_delay == 0xBBB || 0xE10 */;
1868

1869 1870 1871 1872 1873 1874 1875 1876 1877
                if (left >= 32 && !is_d10) {
                    GetBitContext gb = s->gb;
                    align_get_bits(&gb);
                    if (show_bits(&gb, 24) == 0x060E2B) {
                        av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
                        is_d10 = 1;
                    }
                }

1878 1879
                if (left < 0 ||
                    (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
1880
                    ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1881 1882
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
                           left, show_bits(&s->gb, FFMIN(left, 23)));
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920
                    return -1;
                } else
                    goto eos;
            }

            ff_init_block_index(s);
        }

        /* skip mb handling */
        if (s->mb_skip_run == -1) {
            /* read increment again */
            s->mb_skip_run = 0;
            for (;;) {
                int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
                                    MBINCR_VLC_BITS, 2);
                if (code < 0) {
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
                    return -1;
                }
                if (code >= 33) {
                    if (code == 33) {
                        s->mb_skip_run += 33;
                    } else if (code == 35) {
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
                            return -1;
                        }
                        goto eos; /* end of slice */
                    }
                    /* otherwise, stuffing, nothing to do */
                } else {
                    s->mb_skip_run += code;
                    break;
                }
            }
            if (s->mb_skip_run) {
                int i;
                if (s->pict_type == AV_PICTURE_TYPE_I) {
1921 1922
                    av_log(s->avctx, AV_LOG_ERROR,
                           "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
                    return -1;
                }

                /* skip mb */
                s->mb_intra = 0;
                for (i = 0; i < 12; i++)
                    s->block_last_index[i] = -1;
                if (s->picture_structure == PICT_FRAME)
                    s->mv_type = MV_TYPE_16X16;
                else
                    s->mv_type = MV_TYPE_FIELD;
                if (s->pict_type == AV_PICTURE_TYPE_P) {
                    /* if P type, zero motion vector is implied */
                    s->mv_dir             = MV_DIR_FORWARD;
                    s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
                    s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
                    s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
                } else {
                    /* if B type, reuse previous vectors and directions */
                    s->mv[0][0][0] = s->last_mv[0][0][0];
                    s->mv[0][0][1] = s->last_mv[0][0][1];
                    s->mv[1][0][0] = s->last_mv[1][0][0];
                    s->mv[1][0][1] = s->last_mv[1][0][1];
                }
            }
        }
    }
eos: // end of slice
1952 1953
    if (get_bits_left(&s->gb) < 0)
        return AVERROR_INVALIDDATA;
1954
    *buf += (get_bits_count(&s->gb) - 1) / 8;
1955 1956 1957 1958 1959 1960
    av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
    return 0;
}

static int slice_decode_thread(AVCodecContext *c, void *arg)
{
1961
    MpegEncContext *s   = *(void **) arg;
1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
    const uint8_t *buf  = s->gb.buffer;
    int mb_y            = s->start_mb_y;
    const int field_pic = s->picture_structure != PICT_FRAME;

    s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;

    for (;;) {
        uint32_t start_code;
        int ret;

        ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
        emms_c();
        av_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
                ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
                s->start_mb_y, s->end_mb_y, s->er.error_count);
        if (ret < 0) {
            if (c->err_recognition & AV_EF_EXPLODE)
                return ret;
            if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1981 1982 1983
                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
                                s->mb_x, s->mb_y,
                                ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1984
        } else {
1985 1986 1987
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
                            s->mb_x - 1, s->mb_y,
                            ER_AC_END | ER_DC_END | ER_MV_END);
1988 1989 1990 1991 1992 1993
        }

        if (s->mb_y == s->end_mb_y)
            return 0;

        start_code = -1;
1994
        buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1995 1996
        mb_y       = start_code - SLICE_MIN_START_CODE;
        if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
1997 1998
            mb_y += (*buf&0xE0)<<2;
        mb_y <<= field_pic;
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
        if (s->picture_structure == PICT_BOTTOM_FIELD)
            mb_y++;
        if (mb_y < 0 || mb_y >= s->end_mb_y)
            return -1;
    }
}

/**
 * Handle slice ends.
 * @return 1 if it seems to be the last slice
 */
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
{
2012
    Mpeg1Context *s1  = avctx->priv_data;
2013 2014 2015 2016 2017 2018 2019
    MpegEncContext *s = &s1->mpeg_enc_ctx;

    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
        return 0;

    if (s->avctx->hwaccel) {
        if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
2020 2021
            av_log(avctx, AV_LOG_ERROR,
                   "hardware accelerator failed to decode picture\n");
2022 2023 2024
    }

    /* end of slice reached */
2025
    if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
2026 2027 2028 2029 2030 2031 2032
        /* end of image */

        ff_er_frame_end(&s->er);

        ff_MPV_frame_end(s);

        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
2033
            int ret = av_frame_ref(pict, s->current_picture_ptr->f);
2034 2035
            if (ret < 0)
                return ret;
2036 2037
            ff_print_debug_info(s, s->current_picture_ptr, pict);
            ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2038 2039 2040 2041 2042 2043
        } else {
            if (avctx->active_thread_type & FF_THREAD_FRAME)
                s->picture_number++;
            /* latency of 1 frame for I- and P-frames */
            /* XXX: use another variable than picture_number */
            if (s->last_picture_ptr != NULL) {
2044
                int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2045 2046
                if (ret < 0)
                    return ret;
2047 2048
                ff_print_debug_info(s, s->last_picture_ptr, pict);
                ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
            }
        }

        return 1;
    } else {
        return 0;
    }
}

static int mpeg1_decode_sequence(AVCodecContext *avctx,
                                 const uint8_t *buf, int buf_size)
{
2061
    Mpeg1Context *s1  = avctx->priv_data;
2062 2063 2064 2065
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int width, height;
    int i, v, j;

2066
    init_get_bits(&s->gb, buf, buf_size * 8);
2067 2068 2069 2070

    width  = get_bits(&s->gb, 12);
    height = get_bits(&s->gb, 12);
    if (width == 0 || height == 0) {
2071 2072
        av_log(avctx, AV_LOG_WARNING,
               "Invalid horizontal or vertical size value.\n");
2073
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2074 2075 2076 2077 2078
            return AVERROR_INVALIDDATA;
    }
    s->aspect_ratio_info = get_bits(&s->gb, 4);
    if (s->aspect_ratio_info == 0) {
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2079
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098
            return -1;
    }
    s->frame_rate_index = get_bits(&s->gb, 4);
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
        return -1;
    s->bit_rate = get_bits(&s->gb, 18) * 400;
    if (get_bits1(&s->gb) == 0) /* marker */
        return -1;
    s->width  = width;
    s->height = height;

    s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
    skip_bits(&s->gb, 1);

    /* get matrix */
    if (get_bits1(&s->gb)) {
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
    } else {
        for (i = 0; i < 64; i++) {
2099
            j = s->idsp.idct_permutation[i];
2100 2101 2102 2103 2104 2105 2106 2107 2108
            v = ff_mpeg1_default_intra_matrix[i];
            s->intra_matrix[j]        = v;
            s->chroma_intra_matrix[j] = v;
        }
    }
    if (get_bits1(&s->gb)) {
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
    } else {
        for (i = 0; i < 64; i++) {
2109
            int j = s->idsp.idct_permutation[i];
2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
            v = ff_mpeg1_default_non_intra_matrix[i];
            s->inter_matrix[j]        = v;
            s->chroma_inter_matrix[j] = v;
        }
    }

    if (show_bits(&s->gb, 23) != 0) {
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
        return -1;
    }

2121
    /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2122 2123 2124
    s->progressive_sequence = 1;
    s->progressive_frame    = 1;
    s->picture_structure    = PICT_FRAME;
2125
    s->first_field          = 0;
2126 2127
    s->frame_pred_frame_dct = 1;
    s->chroma_format        = 1;
2128 2129
    s->codec_id             =
    s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
    s->out_format           = FMT_MPEG1;
    s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
    if (s->flags & CODEC_FLAG_LOW_DELAY)
        s->low_delay = 1;

    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
               s->avctx->rc_buffer_size, s->bit_rate);

    return 0;
}

static int vcr2_init_sequence(AVCodecContext *avctx)
{
2144
    Mpeg1Context *s1  = avctx->priv_data;
2145 2146 2147 2148 2149 2150 2151
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int i, v;

    /* start new MPEG-1 context decoding */
    s->out_format = FMT_MPEG1;
    if (s1->mpeg_enc_ctx_allocated) {
        ff_MPV_common_end(s);
2152
        s1->mpeg_enc_ctx_allocated = 0;
2153
    }
2154 2155
    s->width            = avctx->coded_width;
    s->height           = avctx->coded_height;
2156
    avctx->has_b_frames = 0; // true?
2157
    s->low_delay        = 1;
2158 2159

    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2160
    setup_hwaccel_for_pixfmt(avctx);
2161 2162 2163 2164 2165 2166

    if (ff_MPV_common_init(s) < 0)
        return -1;
    s1->mpeg_enc_ctx_allocated = 1;

    for (i = 0; i < 64; i++) {
2167
        int j = s->idsp.idct_permutation[i];
2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179
        v = ff_mpeg1_default_intra_matrix[i];
        s->intra_matrix[j]        = v;
        s->chroma_intra_matrix[j] = v;

        v = ff_mpeg1_default_non_intra_matrix[i];
        s->inter_matrix[j]        = v;
        s->chroma_inter_matrix[j] = v;
    }

    s->progressive_sequence  = 1;
    s->progressive_frame     = 1;
    s->picture_structure     = PICT_FRAME;
2180
    s->first_field           = 0;
2181 2182
    s->frame_pred_frame_dct  = 1;
    s->chroma_format         = 1;
2183 2184 2185 2186 2187 2188
    if (s->codec_tag == AV_RL32("BW10")) {
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
    } else {
        s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
        s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
    }
2189 2190 2191 2192 2193 2194
    s1->save_width           = s->width;
    s1->save_height          = s->height;
    s1->save_progressive_seq = s->progressive_sequence;
    return 0;
}

2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
                              const uint8_t *p, int buf_size)
{
    Mpeg1Context *s1 = avctx->priv_data;

    if (buf_size >= 6 &&
        p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
        p[4] == 3 && (p[5] & 0x40)) {
        /* extract A53 Part 4 CC data */
        int cc_count = p[5] & 0x1f;
        if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
            av_freep(&s1->a53_caption);
            s1->a53_caption_size = cc_count * 3;
2208 2209
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
            if (s1->a53_caption)
2210 2211 2212 2213
                memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
        }
        return 1;
    } else if (buf_size >= 11 &&
2214
               p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225
        /* extract DVD CC data */
        int cc_count = 0;
        int i;
        // There is a caption count field in the data, but it is often
        // incorect.  So count the number of captions present.
        for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
            cc_count++;
        // Transform the DVD format into A53 Part 4 format
        if (cc_count > 0) {
            av_freep(&s1->a53_caption);
            s1->a53_caption_size = cc_count * 6;
2226
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247
            if (s1->a53_caption) {
                uint8_t field1 = !!(p[4] & 0x80);
                uint8_t *cap = s1->a53_caption;
                p += 5;
                for (i = 0; i < cc_count; i++) {
                    cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
                    cap[1] = p[1];
                    cap[2] = p[2];
                    cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
                    cap[4] = p[4];
                    cap[5] = p[5];
                    cap += 6;
                    p += 6;
                }
            }
        }
        return 1;
    }
    return 0;
}

2248 2249 2250
static void mpeg_decode_user_data(AVCodecContext *avctx,
                                  const uint8_t *p, int buf_size)
{
2251
    Mpeg1Context *s = avctx->priv_data;
2252 2253
    const uint8_t *buf_end = p + buf_size;

2254
    if (buf_size > 29){
2255 2256
        int i;
        for(i=0; i<20; i++)
2257
            if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
2258 2259 2260 2261 2262 2263 2264 2265 2266
                s->tmpgexs= 1;
            }

/*        for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
            av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
        }
            av_log(avctx, AV_LOG_ERROR, "\n");*/
    }

2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280
    /* we parse the DTG active format information */
    if (buf_end - p >= 5 &&
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
        int flags = p[4];
        p += 5;
        if (flags & 0x80) {
            /* skip event id */
            p += 2;
        }
        if (flags & 0x40) {
            if (buf_end - p < 1)
                return;
            avctx->dtg_active_format = p[0] & 0x0f;
        }
2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
    } else if (buf_end - p >= 6 &&
               p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
               p[4] == 0x03) { // S3D_video_format_length
        // the 0x7F mask ignores the reserved_bit value
        const uint8_t S3D_video_format_type = p[5] & 0x7F;

        if (S3D_video_format_type == 0x03 ||
            S3D_video_format_type == 0x04 ||
            S3D_video_format_type == 0x08 ||
            S3D_video_format_type == 0x23) {
            Mpeg1Context *s1   = avctx->priv_data;
2292

2293
            s1->has_stereo3d = 1;
2294 2295 2296

            switch (S3D_video_format_type) {
            case 0x03:
2297
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2298 2299
                break;
            case 0x04:
2300
                s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2301 2302
                break;
            case 0x08:
2303
                s1->stereo3d.type = AV_STEREO3D_2D;
2304 2305
                break;
            case 0x23:
2306
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2307 2308 2309
                break;
            }
        }
2310 2311
    } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
        return;
2312 2313 2314 2315 2316 2317 2318 2319 2320
    }
}

static void mpeg_decode_gop(AVCodecContext *avctx,
                            const uint8_t *buf, int buf_size)
{
    Mpeg1Context *s1  = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int broken_link;
2321
    int64_t tc;
2322

2323
    init_get_bits(&s->gb, buf, buf_size * 8);
2324

2325
    tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2326

2327
    s->closed_gop = get_bits1(&s->gb);
2328 2329 2330
    /* broken_link indicate that after editing the
     * reference frames of the first B-Frames after GOP I-Frame
     * are missing (open gop) */
2331 2332
    broken_link = get_bits1(&s->gb);

2333 2334 2335 2336 2337 2338 2339
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
        char tcbuf[AV_TIMECODE_STR_SIZE];
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
        av_log(s->avctx, AV_LOG_DEBUG,
               "GOP (%s) closed_gop=%d broken_link=%d\n",
               tcbuf, s->closed_gop, broken_link);
    }
2340 2341
}

2342 2343
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
                         int *got_output, const uint8_t *buf, int buf_size)
2344 2345 2346 2347 2348 2349
{
    Mpeg1Context *s = avctx->priv_data;
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
    const uint8_t *buf_ptr = buf;
    const uint8_t *buf_end = buf + buf_size;
    int ret, input_size;
2350
    int last_code = 0, skip_frame = 0;
2351
    int picture_start_code_seen = 0;
2352 2353 2354 2355 2356 2357

    for (;;) {
        /* find next start code */
        uint32_t start_code = -1;
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
        if (start_code > 0x1ff) {
2358
            if (!skip_frame) {
2359 2360
                if (HAVE_THREADS &&
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2361
                    !avctx->hwaccel) {
2362
                    int i;
2363
                    av_assert0(avctx->thread_count > 1);
2364

2365 2366 2367
                    avctx->execute(avctx, slice_decode_thread,
                                   &s2->thread_context[0], NULL,
                                   s->slice_count, sizeof(void *));
2368 2369 2370 2371
                    for (i = 0; i < s->slice_count; i++)
                        s2->er.error_count += s2->thread_context[i]->er.error_count;
                }

2372 2373 2374 2375
                if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
                    && uses_vdpau(avctx))
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);

2376 2377 2378 2379
                ret = slice_end(avctx, picture);
                if (ret < 0)
                    return ret;
                else if (ret) {
2380 2381
                    // FIXME: merge with the stuff in mpeg_decode_slice
                    if (s2->last_picture_ptr || s2->low_delay)
2382 2383 2384 2385
                        *got_output = 1;
                }
            }
            s2->pict_type = 0;
2386 2387 2388 2389

            if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
                return AVERROR_INVALIDDATA;

2390 2391 2392 2393 2394
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
        }

        input_size = buf_end - buf_ptr;

2395
        if (avctx->debug & FF_DEBUG_STARTCODE)
2396
            av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" left %d\n",
2397
                   start_code, buf_ptr - buf, input_size);
2398 2399 2400 2401 2402 2403

        /* prepare data for next start code */
        switch (start_code) {
        case SEQ_START_CODE:
            if (last_code == 0) {
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2404 2405
                if (buf != avctx->extradata)
                    s->sync = 1;
2406
            } else {
2407 2408
                av_log(avctx, AV_LOG_ERROR,
                       "ignoring SEQ_START_CODE after %X\n", last_code);
2409 2410 2411 2412 2413 2414
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;

        case PICTURE_START_CODE:
2415 2416 2417 2418 2419 2420 2421 2422
            if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
               /* If it's a frame picture, there can't be more than one picture header.
                  Yet, it does happen and we need to handle it. */
               av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
               break;
            }
            picture_start_code_seen = 1;

2423 2424 2425 2426 2427 2428
            if (s2->width <= 0 || s2->height <= 0) {
                av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
                       s2->width, s2->height);
                return AVERROR_INVALIDDATA;
            }

2429
            if (s->tmpgexs){
2430 2431 2432
                s2->intra_dc_precision= 3;
                s2->intra_matrix[0]= 1;
            }
2433 2434
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
                !avctx->hwaccel && s->slice_count) {
2435 2436 2437 2438
                int i;

                avctx->execute(avctx, slice_decode_thread,
                               s2->thread_context, NULL,
2439
                               s->slice_count, sizeof(void *));
2440 2441 2442 2443 2444 2445 2446
                for (i = 0; i < s->slice_count; i++)
                    s2->er.error_count += s2->thread_context[i]->er.error_count;
                s->slice_count = 0;
            }
            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
                ret = mpeg_decode_postinit(avctx);
                if (ret < 0) {
2447 2448
                    av_log(avctx, AV_LOG_ERROR,
                           "mpeg_decode_postinit() failure\n");
2449 2450 2451
                    return ret;
                }

2452
                /* We have a complete image: we try to decompress it. */
2453 2454
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
                    s2->pict_type = 0;
2455
                s->first_slice = 1;
2456
                last_code      = PICTURE_START_CODE;
2457
            } else {
2458 2459
                av_log(avctx, AV_LOG_ERROR,
                       "ignoring pic after %X\n", last_code);
2460 2461 2462 2463 2464
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;
        case EXT_START_CODE:
2465
            init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2466 2467 2468 2469

            switch (get_bits(&s2->gb, 4)) {
            case 0x1:
                if (last_code == 0) {
2470
                    mpeg_decode_sequence_extension(s);
2471
                } else {
2472 2473
                    av_log(avctx, AV_LOG_ERROR,
                           "ignoring seq ext after %X\n", last_code);
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490
                    if (avctx->err_recognition & AV_EF_EXPLODE)
                        return AVERROR_INVALIDDATA;
                }
                break;
            case 0x2:
                mpeg_decode_sequence_display_extension(s);
                break;
            case 0x3:
                mpeg_decode_quant_matrix_extension(s2);
                break;
            case 0x7:
                mpeg_decode_picture_display_extension(s);
                break;
            case 0x8:
                if (last_code == PICTURE_START_CODE) {
                    mpeg_decode_picture_coding_extension(s);
                } else {
2491 2492
                    av_log(avctx, AV_LOG_ERROR,
                           "ignoring pic cod ext after %X\n", last_code);
2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503
                    if (avctx->err_recognition & AV_EF_EXPLODE)
                        return AVERROR_INVALIDDATA;
                }
                break;
            }
            break;
        case USER_START_CODE:
            mpeg_decode_user_data(avctx, buf_ptr, input_size);
            break;
        case GOP_START_CODE:
            if (last_code == 0) {
2504
                s2->first_field = 0;
2505
                mpeg_decode_gop(avctx, buf_ptr, input_size);
2506
                s->sync = 1;
2507
            } else {
2508 2509
                av_log(avctx, AV_LOG_ERROR,
                       "ignoring GOP_START_CODE after %X\n", last_code);
2510 2511 2512 2513 2514
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;
        default:
2515 2516 2517 2518
            if (start_code >= SLICE_MIN_START_CODE &&
                start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {
                if (s2->progressive_sequence && !s2->progressive_frame) {
                    s2->progressive_frame = 1;
2519 2520
                    av_log(s2->avctx, AV_LOG_ERROR,
                           "interlaced frame in progressive sequence, ignoring\n");
2521 2522
                }

2523 2524 2525 2526 2527
                if (s2->picture_structure == 0 ||
                    (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
                    av_log(s2->avctx, AV_LOG_ERROR,
                           "picture_structure %d invalid, ignoring\n",
                           s2->picture_structure);
2528 2529 2530
                    s2->picture_structure = PICT_FRAME;
                }

2531
                if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542
                    av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");

                if (s2->picture_structure == PICT_FRAME) {
                    s2->first_field = 0;
                    s2->v_edge_pos  = 16 * s2->mb_height;
                } else {
                    s2->first_field ^= 1;
                    s2->v_edge_pos   = 8 * s2->mb_height;
                    memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
                }
            }
2543 2544 2545
            if (start_code >= SLICE_MIN_START_CODE &&
                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
                const int field_pic = s2->picture_structure != PICT_FRAME;
2546
                int mb_y = start_code - SLICE_MIN_START_CODE;
2547
                last_code = SLICE_MIN_START_CODE;
2548
                if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
2549
                    mb_y += (*buf_ptr&0xE0)<<2;
2550

2551
                mb_y <<= field_pic;
2552 2553 2554
                if (s2->picture_structure == PICT_BOTTOM_FIELD)
                    mb_y++;

2555 2556 2557 2558 2559
                if (buf_end - buf_ptr < 2) {
                    av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
                    return AVERROR_INVALIDDATA;
                }

2560
                if (mb_y >= s2->mb_height) {
2561 2562
                    av_log(s2->avctx, AV_LOG_ERROR,
                           "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2563 2564 2565 2566
                    return -1;
                }

                if (s2->last_picture_ptr == NULL) {
2567 2568
                    /* Skip B-frames if we do not have reference frames and
                     * GOP is not closed. */
2569
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2570
                        if (!s2->closed_gop) {
2571
                            skip_frame = 1;
2572
                            break;
2573
                        }
2574 2575
                    }
                }
2576
                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2577
                    s->sync = 1;
2578
                if (s2->next_picture_ptr == NULL) {
2579 2580
                    /* Skip P-frames if we do not have a reference frame or
                     * we have an invalid header. */
2581 2582 2583 2584
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
                        skip_frame = 1;
                        break;
                    }
2585
                }
2586 2587 2588 2589 2590
                if ((avctx->skip_frame >= AVDISCARD_NONREF &&
                     s2->pict_type == AV_PICTURE_TYPE_B) ||
                    (avctx->skip_frame >= AVDISCARD_NONKEY &&
                     s2->pict_type != AV_PICTURE_TYPE_I) ||
                    avctx->skip_frame >= AVDISCARD_ALL) {
2591
                    skip_frame = 1;
2592
                    break;
2593
                }
2594 2595 2596 2597 2598

                if (!s->mpeg_enc_ctx_allocated)
                    break;

                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2599 2600
                    if (mb_y < avctx->skip_top ||
                        mb_y >= s2->mb_height - avctx->skip_bottom)
2601 2602 2603 2604 2605 2606 2607 2608 2609 2610
                        break;
                }

                if (!s2->pict_type) {
                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
                    if (avctx->err_recognition & AV_EF_EXPLODE)
                        return AVERROR_INVALIDDATA;
                    break;
                }

2611
                if (s->first_slice) {
2612
                    skip_frame     = 0;
2613
                    s->first_slice = 0;
2614 2615 2616 2617
                    if (mpeg_field_start(s2, buf, buf_size) < 0)
                        return -1;
                }
                if (!s2->current_picture_ptr) {
2618 2619
                    av_log(avctx, AV_LOG_ERROR,
                           "current_picture not initialized\n");
2620 2621 2622
                    return AVERROR_INVALIDDATA;
                }

2623 2624 2625 2626 2627
                if (uses_vdpau(avctx)) {
                    s->slice_count++;
                    break;
                }

2628 2629
                if (HAVE_THREADS &&
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2630
                    !avctx->hwaccel) {
2631 2632 2633
                    int threshold = (s2->mb_height * s->slice_count +
                                     s2->slice_context_count / 2) /
                                    s2->slice_context_count;
2634
                    av_assert0(avctx->thread_count > 1);
2635 2636 2637 2638 2639 2640
                    if (threshold <= mb_y) {
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];

                        thread_context->start_mb_y = mb_y;
                        thread_context->end_mb_y   = s2->mb_height;
                        if (s->slice_count) {
2641 2642
                            s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
                            ret = ff_update_duplicate_context(thread_context, s2);
2643 2644 2645
                            if (ret < 0)
                                return ret;
                        }
2646
                        init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657
                        s->slice_count++;
                    }
                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
                } else {
                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
                    emms_c();

                    if (ret < 0) {
                        if (avctx->err_recognition & AV_EF_EXPLODE)
                            return ret;
                        if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
2658 2659 2660
                            ff_er_add_slice(&s2->er, s2->resync_mb_x,
                                            s2->resync_mb_y, s2->mb_x, s2->mb_y,
                                            ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2661
                    } else {
2662 2663 2664
                        ff_er_add_slice(&s2->er, s2->resync_mb_x,
                                        s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
                                        ER_AC_END | ER_DC_END | ER_MV_END);
2665 2666 2667 2668 2669 2670 2671 2672
                    }
                }
            }
            break;
        }
    }
}

2673 2674
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
                             int *got_output, AVPacket *avpkt)
2675 2676
{
    const uint8_t *buf = avpkt->data;
2677
    int ret;
2678 2679 2680 2681 2682 2683 2684 2685
    int buf_size = avpkt->size;
    Mpeg1Context *s = avctx->priv_data;
    AVFrame *picture = data;
    MpegEncContext *s2 = &s->mpeg_enc_ctx;

    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
        /* special case for last picture */
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
2686
            int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
            if (ret < 0)
                return ret;

            s2->next_picture_ptr = NULL;

            *got_output = 1;
        }
        return buf_size;
    }

    if (s2->flags & CODEC_FLAG_TRUNCATED) {
2698 2699
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
                                           buf_size, NULL);
2700

2701 2702
        if (ff_combine_frame(&s2->parse_context, next,
                             (const uint8_t **) &buf, &buf_size) < 0)
2703 2704 2705
            return buf_size;
    }

2706 2707 2708 2709
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
                                           || s2->codec_tag == AV_RL32("BW10")
                                          ))
2710 2711 2712 2713 2714
        vcr2_init_sequence(avctx);

    s->slice_count = 0;

    if (avctx->extradata && !s->extradata_decoded) {
2715 2716 2717
        ret = decode_chunks(avctx, picture, got_output,
                            avctx->extradata, avctx->extradata_size);
        if (*got_output) {
2718 2719 2720
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
            *got_output = 0;
        }
2721
        s->extradata_decoded = 1;
2722 2723
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
            s2->current_picture_ptr = NULL;
2724
            return ret;
2725
        }
2726 2727
    }

2728 2729 2730 2731 2732
    ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
    if (ret<0 || *got_output)
        s2->current_picture_ptr = NULL;

    return ret;
2733 2734 2735 2736 2737 2738
}

static void flush(AVCodecContext *avctx)
{
    Mpeg1Context *s = avctx->priv_data;

2739
    s->sync       = 0;
2740 2741 2742 2743

    ff_mpeg_flush(avctx);
}

2744
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2745 2746 2747 2748 2749
{
    Mpeg1Context *s = avctx->priv_data;

    if (s->mpeg_enc_ctx_allocated)
        ff_MPV_common_end(&s->mpeg_enc_ctx);
2750
    av_freep(&s->a53_caption);
2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762
    return 0;
}

static const AVProfile mpeg2_video_profiles[] = {
    { FF_PROFILE_MPEG2_422,          "4:2:2"              },
    { FF_PROFILE_MPEG2_HIGH,         "High"               },
    { FF_PROFILE_MPEG2_SS,           "Spatially Scalable" },
    { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable"       },
    { FF_PROFILE_MPEG2_MAIN,         "Main"               },
    { FF_PROFILE_MPEG2_SIMPLE,       "Simple"             },
    { FF_PROFILE_RESERVED,           "Reserved"           },
    { FF_PROFILE_RESERVED,           "Reserved"           },
2763
    { FF_PROFILE_UNKNOWN                                  },
2764 2765 2766 2767
};

AVCodec ff_mpeg1video_decoder = {
    .name                  = "mpeg1video",
2768
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778
    .type                  = AVMEDIA_TYPE_VIDEO,
    .id                    = AV_CODEC_ID_MPEG1VIDEO,
    .priv_data_size        = sizeof(Mpeg1Context),
    .init                  = mpeg_decode_init,
    .close                 = mpeg_decode_end,
    .decode                = mpeg_decode_frame,
    .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                             CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                             CODEC_CAP_SLICE_THREADS,
    .flush                 = flush,
2779
    .max_lowres            = 3,
2780 2781 2782 2783 2784
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
};

AVCodec ff_mpeg2video_decoder = {
    .name           = "mpeg2video",
2785
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2786 2787 2788 2789 2790 2791 2792 2793 2794 2795
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                      CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                      CODEC_CAP_SLICE_THREADS,
    .flush          = flush,
2796
    .max_lowres     = 3,
2797 2798 2799
    .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
};

2800 2801 2802
//legacy decoder
AVCodec ff_mpegvideo_decoder = {
    .name           = "mpegvideo",
2803
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
    .flush          = flush,
    .max_lowres     = 3,
};

2815
#if FF_API_XVMC
2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835
#if CONFIG_MPEG_XVMC_DECODER
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
{
    if (avctx->active_thread_type & FF_THREAD_SLICE)
        return -1;
    if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
        return -1;
    if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
        av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
    }
    mpeg_decode_init(avctx);

    avctx->pix_fmt           = AV_PIX_FMT_XVMC_MPEG2_IDCT;
    avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!

    return 0;
}

AVCodec ff_mpeg_xvmc_decoder = {
    .name           = "mpegvideo_xvmc",
2836
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2837 2838 2839 2840 2841 2842 2843
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_mc_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2844
                      CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
2845 2846 2847 2848
    .flush          = flush,
};

#endif
2849
#endif /* FF_API_XVMC */
2850 2851 2852 2853

#if CONFIG_MPEG_VDPAU_DECODER
AVCodec ff_mpeg_vdpau_decoder = {
    .name           = "mpegvideo_vdpau",
2854
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
                      CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
    .flush          = flush,
};
#endif

#if CONFIG_MPEG1_VDPAU_DECODER
AVCodec ff_mpeg1_vdpau_decoder = {
    .name           = "mpeg1video_vdpau",
2870
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG1VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
                      CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
    .flush          = flush,
};
#endif