mpeg12dec.c 96.2 KB
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/*
 * MPEG-1/2 decoder
 * Copyright (c) 2000, 2001 Fabrice Bellard
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * 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.
 *
 * Libav is distributed in the hope that it will be useful,
 * 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
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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

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#include <inttypes.h>

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#include "libavutil/attributes.h"
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#include "libavutil/internal.h"
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#include "libavutil/stereo3d.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "error_resilience.h"
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#include "idctdsp.h"
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#include "internal.h"
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#include "mpeg_er.h"
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#include "mpeg12.h"
#include "mpeg12data.h"
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#include "mpegutils.h"
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#include "mpegvideo.h"
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#include "mpegvideodata.h"
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#include "profiles.h"
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#include "thread.h"
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#include "version.h"
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#include "xvmc_internal.h"
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typedef struct Mpeg1Context {
    MpegEncContext mpeg_enc_ctx;
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
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    int repeat_field;           /* true if we must repeat the field */
    AVPanScan pan_scan;         /* some temporary storage for the panscan */
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    AVStereo3D stereo3d;
    int has_stereo3d;
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    uint8_t *a53_caption;
    int a53_caption_size;
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    uint8_t afd;
    int has_afd;
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    int slice_count;
    int save_aspect_info;
    int save_width, save_height, save_progressive_seq;
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    AVRational frame_rate_ext;  /* MPEG-2 specific framerate modificator */
    int sync;                   /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
    int closed_gop;             /* GOP is closed */
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    int first_slice;
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    int extradata_decoded;
} Mpeg1Context;

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#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] = {
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     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,
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};

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/* 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);
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    if (code == 0)
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        return pred;
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    if (code < 0)
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        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);
}

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#define MAX_INDEX (64 - 1)
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#define check_scantable_index(ctx, x)                                         \
    do {                                                                      \
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        if ((x) > MAX_INDEX) {                                                \
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            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_inter(MpegEncContext *s,
                                           int16_t *block, int n)
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{
    int level, i, j, run;
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    RLTable *rl                  = &ff_rl_mpeg1;
    uint8_t *const scantable     = s->intra_scantable.permutated;
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    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);
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        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
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            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);
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            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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                goto end;
        }
        /* now quantify & encode AC coefficients */
        for (;;) {
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            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
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            if (level != 0) {
                i += run;
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                if (i > MAX_INDEX)
                    break;
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                j = scantable[i];
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                level = (level - 1) | 1;
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                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
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                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
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                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
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                UPDATE_CACHE(re, &s->gb);
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                level = SHOW_SBITS(re, &s->gb, 8);
                SKIP_BITS(re, &s->gb, 8);
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                if (level == -128) {
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                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
                    SKIP_BITS(re, &s->gb, 8);
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                } else if (level == 0) {
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                    level = SHOW_UBITS(re, &s->gb, 8);
                    SKIP_BITS(re, &s->gb, 8);
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                }
                i += run;
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                if (i > MAX_INDEX)
                    break;
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                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;
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            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
    }
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    check_scantable_index(s, i);

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

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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
                                                int16_t *block, int n)
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{
    int level, i, j, run;
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    RLTable *rl              = &ff_rl_mpeg1;
    uint8_t *const scantable = s->intra_scantable.permutated;
    const int qscale         = s->qscale;
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    {
        OPEN_READER(re, &s->gb);
        i = -1;
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        // Special case for first coefficient, no need to add second VLC table.
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        UPDATE_CACHE(re, &s->gb);
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        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
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            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);
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            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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                goto end;
        }

        /* now quantify & encode AC coefficients */
        for (;;) {
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            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
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            if (level != 0) {
                i += run;
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                if (i > MAX_INDEX)
                    break;
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                j = scantable[i];
                level = ((level * 2 + 1) * qscale) >> 1;
                level = (level - 1) | 1;
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                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
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                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
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                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
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                UPDATE_CACHE(re, &s->gb);
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                level = SHOW_SBITS(re, &s->gb, 8);
                SKIP_BITS(re, &s->gb, 8);
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                if (level == -128) {
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                    level = SHOW_UBITS(re, &s->gb, 8) - 256;
                    SKIP_BITS(re, &s->gb, 8);
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                } else if (level == 0) {
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                    level = SHOW_UBITS(re, &s->gb, 8);
                    SKIP_BITS(re, &s->gb, 8);
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                }
                i += run;
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                if (i > MAX_INDEX)
                    break;
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                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;
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            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
    }
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    check_scantable_index(s, i);

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

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static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
                                               int16_t *block, int n)
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{
    int level, i, j, run;
    RLTable *rl = &ff_rl_mpeg1;
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    uint8_t *const scantable = s->intra_scantable.permutated;
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    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;

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        // Special case for first coefficient, no need to add second VLC table.
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        UPDATE_CACHE(re, &s->gb);
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        if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
            level = (3 * qscale * quant_matrix[0]) >> 5;
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            if (GET_CACHE(re, &s->gb) & 0x40000000)
                level = -level;
            block[0]  = level;
            mismatch ^= level;
            i++;
            SKIP_BITS(re, &s->gb, 2);
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            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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                goto end;
        }

        /* now quantify & encode AC coefficients */
        for (;;) {
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            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
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            if (level != 0) {
                i += run;
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                if (i > MAX_INDEX)
                    break;
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                j = scantable[i];
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
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                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
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                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
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                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
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                UPDATE_CACHE(re, &s->gb);
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                level = SHOW_SBITS(re, &s->gb, 12);
                SKIP_BITS(re, &s->gb, 12);
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                i += run;
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                if (i > MAX_INDEX)
                    break;
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                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;
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            if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
    }
    block[63] ^= (mismatch & 1);

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    check_scantable_index(s, i);

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

static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
                                                    int16_t *block, int n)
{
    int level, i, j, run;
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    RLTable *rl              = &ff_rl_mpeg1;
    uint8_t *const scantable = s->intra_scantable.permutated;
    const int qscale         = s->qscale;
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    OPEN_READER(re, &s->gb);
    i = -1;

    // special case for first coefficient, no need to add second VLC table
    UPDATE_CACHE(re, &s->gb);
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    if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
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        level = (3 * qscale) >> 1;
        if (GET_CACHE(re, &s->gb) & 0x40000000)
            level = -level;
        block[0] = level;
        i++;
        SKIP_BITS(re, &s->gb, 2);
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        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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            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;
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            if (i > MAX_INDEX)
                break;
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            j = scantable[i];
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            level = ((level * 2 + 1) * qscale) >> 1;
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            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                    SHOW_SBITS(re, &s->gb, 1);
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            SKIP_BITS(re, &s->gb, 1);
        } else {
            /* escape */
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            run = SHOW_UBITS(re, &s->gb, 6) + 1;
            LAST_SKIP_BITS(re, &s->gb, 6);
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            UPDATE_CACHE(re, &s->gb);
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            level = SHOW_SBITS(re, &s->gb, 12);
            SKIP_BITS(re, &s->gb, 12);
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            i += run;
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            if (i > MAX_INDEX)
                break;
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            j = scantable[i];
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            if (level < 0) {
                level = ((-level * 2 + 1) * qscale) >> 1;
                level = -level;
            } else {
                level = ((level * 2 + 1) * qscale) >> 1;
            }
        }

        block[j] = level;
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        if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
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            break;
        UPDATE_CACHE(re, &s->gb);
    }
end:
    LAST_SKIP_BITS(re, &s->gb, 2);
    CLOSE_READER(re, &s->gb);
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    check_scantable_index(s, i);

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

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static inline int mpeg2_decode_block_intra(MpegEncContext *s,
                                           int16_t *block, int n)
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{
    int level, dc, diff, i, j, run;
    int component;
    RLTable *rl;
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    uint8_t *const scantable = s->intra_scantable.permutated;
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    const uint16_t *quant_matrix;
    const int qscale = s->qscale;
    int mismatch;

    /* DC coefficient */
    if (n < 4) {
        quant_matrix = s->intra_matrix;
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        component    = 0;
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    } else {
        quant_matrix = s->chroma_intra_matrix;
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        component    = (n & 1) + 1;
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    }
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
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        return AVERROR_INVALIDDATA;
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    dc  = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc << (3 - s->intra_dc_precision);
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    ff_dlog(s->avctx, "dc=%d\n", block[0]);
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    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);
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            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
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            if (level == 127) {
                break;
            } else if (level != 0) {
                i += run;
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                if (i > MAX_INDEX)
                    break;
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                j = scantable[i];
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                level = (level * qscale * quant_matrix[j]) >> 4;
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                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
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                LAST_SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
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                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
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                UPDATE_CACHE(re, &s->gb);
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                level = SHOW_SBITS(re, &s->gb, 12);
                SKIP_BITS(re, &s->gb, 12);
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                i += run;
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                if (i > MAX_INDEX)
                    break;
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                j = scantable[i];
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                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;

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    check_scantable_index(s, i);

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

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static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
                                                int16_t *block, int n)
555
{
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    int level, dc, diff, i, j, run;
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    int component;
    RLTable *rl;
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    uint8_t *const scantable = s->intra_scantable.permutated;
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    const uint16_t *quant_matrix;
    const int qscale = s->qscale;

    /* DC coefficient */
    if (n < 4) {
        quant_matrix = s->intra_matrix;
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        component    = 0;
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    } else {
        quant_matrix = s->chroma_intra_matrix;
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        component    = (n & 1) + 1;
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    }
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
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        return AVERROR_INVALIDDATA;
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    dc = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc << (3 - s->intra_dc_precision);
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    i = 0;
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    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);
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            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
                       TEX_VLC_BITS, 2, 0);
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            if (level == 127) {
                break;
            } else if (level != 0) {
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                i += run;
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                if (i > MAX_INDEX)
                    break;
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                j = scantable[i];
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                level = (level * qscale * quant_matrix[j]) >> 4;
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                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
                        SHOW_SBITS(re, &s->gb, 1);
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                LAST_SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
605 606
                run = SHOW_UBITS(re, &s->gb, 6) + 1;
                LAST_SKIP_BITS(re, &s->gb, 6);
607
                UPDATE_CACHE(re, &s->gb);
608 609
                level = SHOW_SBITS(re, &s->gb, 12);
                SKIP_BITS(re, &s->gb, 12);
610
                i += run;
611 612
                if (i > MAX_INDEX)
                    break;
613
                j = scantable[i];
614 615 616 617 618 619 620 621 622 623 624 625 626
                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);
    }

627 628
    check_scantable_index(s, i);

629
    s->block_last_index[n] = i;
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
    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);
647
    if (s->q_scale_type)
648
        return non_linear_qscale[qscale];
649
    else
650 651 652 653 654 655 656 657 658 659 660 661 662
        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);
663
    int ret;
664

665
    ff_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
666 667 668 669 670 671

    assert(s->mb_skipped == 0);

    if (s->mb_skip_run-- != 0) {
        if (s->pict_type == AV_PICTURE_TYPE_P) {
            s->mb_skipped = 1;
672 673
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
                MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
674 675 676 677 678 679
        } 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
680 681
                // 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];
682
            if (IS_INTRA(mb_type))
683
                return AVERROR_INVALIDDATA;
684
            s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
                mb_type | MB_TYPE_SKIP;
//            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));

            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) {
700
                av_log(s->avctx, AV_LOG_ERROR,
701
                       "Invalid mb type in I-frame at %d %d\n",
702
                       s->mb_x, s->mb_y);
703
                return AVERROR_INVALIDDATA;
704 705 706 707 708 709 710 711 712
            }
            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) {
713
            av_log(s->avctx, AV_LOG_ERROR,
714
                   "Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
715
            return AVERROR_INVALIDDATA;
716 717 718 719 720 721
        }
        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) {
722
            av_log(s->avctx, AV_LOG_ERROR,
723
                   "Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
724
            return AVERROR_INVALIDDATA;
725 726 727 728
        }
        mb_type = btype2mb_type[mb_type];
        break;
    }
729
    ff_dlog(s->avctx, "mb_type=%x\n", mb_type);
730 731
//    motion_type = 0; /* avoid warning */
    if (IS_INTRA(mb_type)) {
732
        s->bdsp.clear_blocks(s->block[0]);
733

734
        if (!s->chroma_y_shift)
735
            s->bdsp.clear_blocks(s->block[6]);
736 737

        /* compute DCT type */
738 739 740
        // FIXME: add an interlaced_dct coded var?
        if (s->picture_structure == PICT_FRAME &&
            !s->frame_pred_frame_dct)
741 742 743 744 745 746 747 748
            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)
749
                skip_bits1(&s->gb);  /* field select */
750

751 752 753 754 755 756 757 758
            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]);
759 760

            skip_bits1(&s->gb); /* marker */
761 762 763 764
        } else {
            /* reset mv prediction */
            memset(s->last_mv, 0, sizeof(s->last_mv));
        }
765
        s->mb_intra = 1;
766 767
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
768
        // if 1, we memcpy blocks in xvmcvideo
769
        if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
770
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
771 772
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
773 774

        if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
775
            if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
776
                for (i = 0; i < 6; i++)
777 778
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
            } else {
779
                for (i = 0; i < mb_block_count; i++)
780 781
                    if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
                        return ret;
782 783
            }
        } else {
784 785 786 787 788 789 790 791 792
            for (i = 0; i < 6; i++) {
                ret = ff_mpeg1_decode_block_intra(&s->gb,
                                                  s->intra_matrix,
                                                  s->intra_scantable.permutated,
                                                  s->last_dc, *s->pblocks[i],
                                                  i, s->qscale);
                if (ret < 0) {
                    av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
                           s->mb_x, s->mb_y);
793
                    return ret;
794 795 796 797
                }

                s->block_last_index[i] = ret;
            }
798 799 800 801 802 803 804 805 806 807 808
        }
    } else {
        if (mb_type & MB_TYPE_ZERO_MV) {
            assert(mb_type & MB_TYPE_CBP);

            s->mv_dir = MV_DIR_FORWARD;
            if (s->picture_structure == PICT_FRAME) {
                if (!s->frame_pred_frame_dct)
                    s->interlaced_dct = get_bits1(&s->gb);
                s->mv_type = MV_TYPE_16X16;
            } else {
809 810
                s->mv_type            = MV_TYPE_FIELD;
                mb_type              |= MB_TYPE_INTERLACED;
811 812 813 814 815 816 817 818 819 820
                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;
821 822
            s->mv[0][0][0]      = 0;
            s->mv[0][0][1]      = 0;
823 824 825 826
        } else {
            assert(mb_type & MB_TYPE_L0L1);
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
            /* get additional motion vector type */
827
            if (s->frame_pred_frame_dct) {
828
                motion_type = MT_FRAME;
829
            } else {
830 831 832 833 834 835 836 837 838 839
                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;
840
            ff_dlog(s->avctx, "motion_type=%d\n", motion_type);
841 842 843
            switch (motion_type) {
            case MT_FRAME: /* or MT_16X8 */
                if (s->picture_structure == PICT_FRAME) {
844
                    mb_type   |= MB_TYPE_16x16;
845 846 847 848
                    s->mv_type = MV_TYPE_16X16;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            /* MT_FRAME */
849 850 851 852 853 854 855 856 857 858
                            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]);
859 860 861 862 863 864 865 866
                            /* full_pel: only for MPEG-1 */
                            if (s->full_pel[i]) {
                                s->mv[i][0][0] <<= 1;
                                s->mv[i][0][1] <<= 1;
                            }
                        }
                    }
                } else {
867
                    mb_type   |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
                    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;
897
                                ff_dlog(s->avctx, "fmx=%d\n", val);
898 899 900 901
                                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;
902
                                ff_dlog(s->avctx, "fmy=%d\n", val);
903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
                            }
                        }
                    }
                } else {
                    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:
                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:
973 974
                av_log(s->avctx, AV_LOG_ERROR,
                       "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
975
                return AVERROR_INVALIDDATA;
976 977 978 979 980
            }
        }

        s->mb_intra = 0;
        if (HAS_CBP(mb_type)) {
981
            s->bdsp.clear_blocks(s->block[0]);
982 983 984

            cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
            if (mb_block_count > 6) {
985 986
                cbp <<= mb_block_count - 6;
                cbp  |= get_bits(&s->gb, mb_block_count - 6);
987
                s->bdsp.clear_blocks(s->block[6]);
988 989
            }
            if (cbp <= 0) {
990 991
                av_log(s->avctx, AV_LOG_ERROR,
                       "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
992
                return AVERROR_INVALIDDATA;
993 994
            }

995 996
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
997 998
            // if 1, we memcpy blocks in xvmcvideo
            if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
999
                ff_xvmc_pack_pblocks(s, cbp);
1000 1001
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
1002 1003

            if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
1004
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1005
                    for (i = 0; i < 6; i++) {
1006
                        if (cbp & 32)
1007
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
1008
                        else
1009 1010 1011 1012
                            s->block_last_index[i] = -1;
                        cbp += cbp;
                    }
                } else {
1013
                    cbp <<= 12 - mb_block_count;
1014 1015 1016

                    for (i = 0; i < mb_block_count; i++) {
                        if (cbp & (1 << 11)) {
1017 1018
                            if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
                                return ret;
1019 1020 1021 1022 1023 1024 1025
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                }
            } else {
1026
                if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
1027
                    for (i = 0; i < 6; i++) {
1028
                        if (cbp & 32)
1029
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
1030
                        else
1031 1032 1033 1034 1035 1036
                            s->block_last_index[i] = -1;
                        cbp += cbp;
                    }
                } else {
                    for (i = 0; i < 6; i++) {
                        if (cbp & 32) {
1037 1038
                            if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
                                return ret;
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
                        } 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)
{
1059
    Mpeg1Context *s    = avctx->priv_data;
1060 1061
    MpegEncContext *s2 = &s->mpeg_enc_ctx;

1062
    ff_mpv_decode_defaults(s2);
1063 1064

    s->mpeg_enc_ctx.avctx  = avctx;
1065 1066 1067 1068

    /* we need some permutation to store matrices,
     * until the decoder sets the real permutation. */
    ff_mpv_idct_init(s2);
1069 1070 1071 1072 1073 1074 1075
    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;
1076
    avctx->color_range             = AVCOL_RANGE_MPEG;
1077 1078 1079 1080 1081 1082 1083
    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;
}

1084 1085
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
                                             const AVCodecContext *avctx_from)
1086 1087 1088 1089 1090
{
    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;

1091 1092 1093
    if (avctx == avctx_from               ||
        !ctx_from->mpeg_enc_ctx_allocated ||
        !s1->context_initialized)
1094 1095 1096
        return 0;

    err = ff_mpeg_update_thread_context(avctx, avctx_from);
1097 1098
    if (err)
        return err;
1099

1100 1101 1102 1103 1104
    if (!ctx->mpeg_enc_ctx_allocated) {
        // copy the whole context after the initial MpegEncContext structure
        memcpy(ctx, ctx_from, sizeof(*ctx));
        memset(&ctx->mpeg_enc_ctx, 0, sizeof(ctx->mpeg_enc_ctx));
    }
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119

    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));

1120
    for (i = 0; i < 64; i++)
1121 1122 1123
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
}

1124
#if FF_API_XVMC
1125 1126 1127
static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
    AV_PIX_FMT_XVMC_MPEG2_IDCT,
    AV_PIX_FMT_XVMC_MPEG2_MC,
1128 1129
    AV_PIX_FMT_NONE
};
1130
#endif /* FF_API_XVMC */
1131 1132 1133 1134 1135

static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
#if CONFIG_MPEG2_DXVA2_HWACCEL
    AV_PIX_FMT_DXVA2_VLD,
#endif
1136 1137 1138
#if CONFIG_MPEG2_D3D11VA_HWACCEL
    AV_PIX_FMT_D3D11VA_VLD,
#endif
1139
#if CONFIG_MPEG2_VAAPI_HWACCEL
1140
    AV_PIX_FMT_VAAPI,
1141 1142 1143 1144 1145 1146 1147 1148
#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
    AV_PIX_FMT_VDPAU,
#endif
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_NONE
};

1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
    AV_PIX_FMT_YUV422P,
    AV_PIX_FMT_NONE
};

static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
    AV_PIX_FMT_YUV444P,
    AV_PIX_FMT_NONE
};

1159 1160
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
{
1161
    Mpeg1Context *s1  = avctx->priv_data;
1162
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1163
    const enum AVPixelFormat *pix_fmts;
1164

1165 1166
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
1167
    if (avctx->xvmc_acceleration)
1168
        return ff_get_format(avctx, pixfmt_xvmc_mpg2_420);
1169 1170 1171
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */

1172
    if (s->chroma_format < 2)
1173
        pix_fmts = mpeg12_hwaccel_pixfmt_list_420;
1174
    else if (s->chroma_format == 2)
1175
        pix_fmts = mpeg12_pixfmt_list_422;
1176
    else
1177 1178 1179
        pix_fmts = mpeg12_pixfmt_list_444;

    return ff_get_format(avctx, pix_fmts);
1180 1181 1182 1183 1184 1185
}

/* 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)
{
1186
    Mpeg1Context *s1  = avctx->priv_data;
1187 1188
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    uint8_t old_permutation[64];
1189
    int ret;
1190

1191 1192 1193
    if ((s1->mpeg_enc_ctx_allocated == 0)                   ||
        avctx->coded_width       != s->width                ||
        avctx->coded_height      != s->height               ||
1194 1195 1196 1197
        s1->save_width           != s->width                ||
        s1->save_height          != s->height               ||
        s1->save_aspect_info     != s->aspect_ratio_info    ||
        s1->save_progressive_seq != s->progressive_sequence ||
1198
        0) {
1199 1200 1201
        if (s1->mpeg_enc_ctx_allocated) {
            ParseContext pc = s->parse_context;
            s->parse_context.buffer = 0;
1202
            ff_mpv_common_end(s);
1203 1204 1205
            s->parse_context = pc;
        }

1206 1207 1208 1209
        ret = ff_set_dimensions(avctx, s->width, s->height);
        if (ret < 0)
            return ret;

1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
        avctx->bit_rate          = s->bit_rate;
        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) {
1221
            // MPEG-1 fps
1222
            avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
1223 1224 1225 1226 1227
            // 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
1228 1229
            av_reduce(&s->avctx->framerate.num,
                      &s->avctx->framerate.den,
1230
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
1231 1232 1233
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
                      1 << 30);
            avctx->ticks_per_frame = 2;
1234
            // MPEG-2 aspect
1235 1236 1237
            if (s->aspect_ratio_info > 1) {
                AVRational dar =
                    av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1238 1239 1240 1241 1242 1243 1244 1245
                                      (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 */
1246
                if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
1247 1248
                    (av_cmp_q(dar, (AVRational) { 4, 3 }) &&
                     av_cmp_q(dar, (AVRational) { 16, 9 }))) {
1249 1250
                    s->avctx->sample_aspect_ratio =
                        av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1251
                                 (AVRational) { s->width, s->height });
1252 1253 1254
                } else {
                    s->avctx->sample_aspect_ratio =
                        av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
1255 1256 1257 1258
                                 (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
1259
//                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
1260
                    ff_dlog(avctx, "A %d/%d\n",
1261 1262
                            ff_mpeg2_aspect[s->aspect_ratio_info].num,
                            ff_mpeg2_aspect[s->aspect_ratio_info].den);
1263
                    ff_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
1264 1265 1266 1267 1268 1269 1270 1271
                            s->avctx->sample_aspect_ratio.den);
                }
            } else {
                s->avctx->sample_aspect_ratio =
                    ff_mpeg2_aspect[s->aspect_ratio_info];
            }
        } // MPEG-2

1272 1273
        ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);

1274 1275
        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
        // until then pix_fmt may be changed right after codec init
1276 1277
#if FF_API_XVMC
        if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
1278
             avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO)
1279 1280 1281 1282
#else
        if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
#endif /* FF_API_XVMC */
            avctx->idct_algo = FF_IDCT_SIMPLE;
1283 1284 1285

        /* Quantization matrices may need reordering
         * if DCT permutation is changed. */
1286
        memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
1287

1288
        ff_mpv_idct_init(s);
1289 1290
        if ((ret = ff_mpv_common_init(s)) < 0)
            return ret;
1291

1292 1293 1294 1295
        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);
1296 1297 1298 1299 1300 1301

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

1302 1303
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
                                int buf_size)
1304
{
1305
    Mpeg1Context *s1  = avctx->priv_data;
1306 1307 1308
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int ref, f_code, vbv_delay;

1309
    init_get_bits(&s->gb, buf, buf_size * 8);
1310 1311 1312 1313

    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)
1314
        return AVERROR_INVALIDDATA;
1315 1316

    vbv_delay = get_bits(&s->gb, 16);
1317 1318
    if (s->pict_type == AV_PICTURE_TYPE_P ||
        s->pict_type == AV_PICTURE_TYPE_B) {
1319 1320 1321
        s->full_pel[0] = get_bits1(&s->gb);
        f_code = get_bits(&s->gb, 3);
        if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1322
            return AVERROR_INVALIDDATA;
1323 1324 1325 1326 1327 1328 1329
        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);
        if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
1330
            return AVERROR_INVALIDDATA;
1331 1332 1333
        s->mpeg_f_code[1][0] = f_code;
        s->mpeg_f_code[1][1] = f_code;
    }
1334 1335
    s->current_picture.f->pict_type = s->pict_type;
    s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1336 1337

    if (avctx->debug & FF_DEBUG_PICT_INFO)
1338 1339
        av_log(avctx, AV_LOG_DEBUG,
               "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1340 1341 1342 1343 1344 1345 1346 1347

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

static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
{
1348
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1349 1350 1351 1352 1353 1354
    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);
1355
    s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366
    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);
1367
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
1368 1369 1370 1371 1372
        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;

1373
    ff_dlog(s->avctx, "sequence extension\n");
1374
    s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
1375 1376

    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1377 1378 1379 1380
        av_log(s->avctx, AV_LOG_DEBUG,
               "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
               s->avctx->profile, s->avctx->level,
               s->avctx->rc_buffer_size, s->bit_rate);
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
}

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);
1396
    skip_bits(&s->gb, 1); // marker
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433
    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)
1434 1435
        av_log(s->avctx, AV_LOG_DEBUG,
               "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
1436 1437 1438 1439 1440
               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]);
}

1441 1442
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
                       uint16_t matrix1[64], int intra)
1443 1444 1445 1446
{
    int i;

    for (i = 0; i < 64; i++) {
1447
        int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1448 1449 1450
        int v = get_bits(&s->gb, 8);
        if (v == 0) {
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1451
            return AVERROR_INVALIDDATA;
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
        }
        if (intra && i == 0 && v != 8) {
            av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
            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)
{
1466
    ff_dlog(s->avctx, "matrix extension\n");
1467

1468 1469 1470 1471 1472 1473 1474 1475
    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);
1476 1477 1478 1479 1480 1481
}

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

1482
    s->full_pel[0]       = s->full_pel[1] = 0;
1483 1484 1485 1486 1487
    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) {
1488 1489
        av_log(s->avctx, AV_LOG_ERROR,
               "Missing picture start code, guessing missing values\n");
1490 1491 1492 1493 1494 1495 1496
        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;
1497 1498
        s->current_picture.f->pict_type = s->pict_type;
        s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
    }
    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->progressive_sequence && !s->progressive_frame) {
        s->progressive_frame = 1;
1514 1515
        av_log(s->avctx, AV_LOG_ERROR,
               "interlaced frame in progressive sequence, ignoring\n");
1516 1517
    }

1518 1519 1520 1521 1522
    if (s->picture_structure == 0 ||
        (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
        av_log(s->avctx, AV_LOG_ERROR,
               "picture_structure %d invalid, ignoring\n",
               s->picture_structure);
1523 1524 1525
        s->picture_structure = PICT_FRAME;
    }

1526
    if (s->progressive_sequence && !s->frame_pred_frame_dct)
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
        av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");

    if (s->picture_structure == PICT_FRAME) {
        s->first_field = 0;
        s->v_edge_pos  = 16 * s->mb_height;
    } else {
        s->first_field ^= 1;
        s->v_edge_pos   = 8 * s->mb_height;
        memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
    }

    if (s->alternate_scan) {
1539 1540
        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);
1541
    } else {
1542 1543
        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);
1544 1545 1546
    }

    /* composite display not parsed */
1547 1548 1549 1550 1551 1552 1553 1554 1555
    ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
    ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
    ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
    ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
    ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
    ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
    ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
    ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
    ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1556 1557 1558 1559 1560
}

static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
{
    AVCodecContext *avctx = s->avctx;
1561
    Mpeg1Context *s1      = (Mpeg1Context *) s;
1562
    int ret;
1563 1564 1565 1566 1567

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

1568 1569
        if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
            return ret;
1570 1571 1572 1573

        ff_mpeg_er_frame_start(s);

        /* first check if we must repeat the frame */
1574
        s->current_picture_ptr->f->repeat_pict = 0;
1575 1576 1577
        if (s->repeat_first_field) {
            if (s->progressive_sequence) {
                if (s->top_field_first)
1578
                    s->current_picture_ptr->f->repeat_pict = 4;
1579
                else
1580
                    s->current_picture_ptr->f->repeat_pict = 2;
1581
            } else if (s->progressive_frame) {
1582
                s->current_picture_ptr->f->repeat_pict = 1;
1583 1584 1585
            }
        }

1586
        pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
1587 1588 1589 1590 1591 1592
                                          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));

1593 1594
        if (s1->a53_caption) {
            AVFrameSideData *sd = av_frame_new_side_data(
1595
                s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1596 1597 1598 1599 1600
                s1->a53_caption_size);
            if (sd)
                memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
            av_freep(&s1->a53_caption);
        }
1601 1602

        if (s1->has_stereo3d) {
1603
            AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
1604 1605 1606 1607 1608 1609
            if (!stereo)
                return AVERROR(ENOMEM);

            *stereo = s1->stereo3d;
            s1->has_stereo3d = 0;
        }
1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621

        if (s1->has_afd) {
            AVFrameSideData *sd =
                av_frame_new_side_data(s->current_picture_ptr->f,
                                       AV_FRAME_DATA_AFD, 1);
            if (!sd)
                return AVERROR(ENOMEM);

            *sd->data   = s1->afd;
            s1->has_afd = 0;
        }

1622 1623 1624 1625 1626 1627 1628
        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");
1629
            return AVERROR_INVALIDDATA;
1630 1631 1632 1633 1634
        }

        if (s->avctx->hwaccel &&
            (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
            if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1635 1636
                av_log(avctx, AV_LOG_ERROR,
                       "hardware accelerator failed to decode first field\n");
1637 1638 1639
        }

        for (i = 0; i < 4; i++) {
1640
            s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
1641
            if (s->picture_structure == PICT_BOTTOM_FIELD)
1642 1643
                s->current_picture.f->data[i] +=
                    s->current_picture_ptr->f->linesize[i];
1644 1645 1646 1647
        }
    }

    if (avctx->hwaccel) {
1648 1649
        if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
            return ret;
1650 1651
    }

1652 1653
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
1654
// ff_mpv_frame_start will call this function too,
1655 1656 1657 1658
// but we need to call it on every field
    if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
        if (ff_xvmc_field_start(s, avctx) < 0)
            return -1;
1659 1660
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678

    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;
    const int field_pic   = s->picture_structure != PICT_FRAME;
1679
    int ret;
1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694

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

    assert(mb_y < s->mb_height);

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

    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");
1695
        return AVERROR_INVALIDDATA;
1696 1697 1698
    }

    /* extra slice info */
1699
    while (get_bits1(&s->gb) != 0)
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
        skip_bits(&s->gb, 8);

    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");
1712
                return AVERROR_INVALIDDATA;
1713 1714
            }
            if (code >= 33) {
1715
                if (code == 33)
1716 1717 1718 1719 1720 1721 1722 1723 1724
                    s->mb_x += 33;
                /* otherwise, stuffing, nothing to do */
            } else {
                s->mb_x += code;
                break;
            }
        }
    }

1725
    if (s->mb_x >= (unsigned) s->mb_width) {
1726
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1727
        return AVERROR_INVALIDDATA;
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
    }

    if (avctx->hwaccel) {
        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) {
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
            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" : "");
1766 1767 1768 1769
        }
    }

    for (;;) {
1770 1771
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
1772 1773 1774
        // If 1, we memcpy blocks in xvmcvideo.
        if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
            ff_xvmc_init_block(s); // set s->block
1775 1776
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
1777

1778 1779
        if ((ret = mpeg_decode_mb(s, s->block)) < 0)
            return ret;
1780

1781 1782
        // Note motion_val is normally NULL unless we want to extract the MVs.
        if (s->current_picture.motion_val[0] && !s->encoding) {
1783 1784 1785 1786 1787 1788 1789
            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++) {
1790 1791
                    if (s->mb_intra ||
                        (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1792
                        motion_x = motion_y = 0;
1793 1794
                    } else if (s->mv_type == MV_TYPE_16X16 ||
                               (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1795 1796
                        motion_x = s->mv[dir][0][0];
                        motion_y = s->mv[dir][0][1];
1797
                    } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
1798 1799 1800 1801
                        motion_x = s->mv[dir][i][0];
                        motion_y = s->mv[dir][i][1];
                    }

1802 1803
                    s->current_picture.motion_val[dir][xy][0]     = motion_x;
                    s->current_picture.motion_val[dir][xy][1]     = motion_y;
1804 1805
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1806
                    s->current_picture.ref_index [dir][b8_xy]     =
1807
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1808 1809
                    assert(s->field_select[dir][i] == 0 ||
                           s->field_select[dir][i] == 1);
1810
                }
1811 1812
                xy    += wrap;
                b8_xy += 2;
1813 1814 1815 1816 1817 1818 1819
            }
        }

        s->dest[0] += 16;
        s->dest[1] += 16 >> s->chroma_x_shift;
        s->dest[2] += 16 >> s->chroma_x_shift;

1820
        ff_mpv_decode_mb(s, s->block);
1821 1822 1823 1824

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

1825
            ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
1826
            ff_mpv_report_decode_progress(s);
1827

1828
            s->mb_x  = 0;
1829 1830 1831 1832
            s->mb_y += 1 << field_pic;

            if (s->mb_y >= s->mb_height) {
                int left   = get_bits_left(&s->gb);
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845
                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 */;

                if (left < 0 ||
                    (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
                    ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
                           left, show_bits(&s->gb, FFMIN(left, 23)));
1846
                    return AVERROR_INVALIDDATA;
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862
                } 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");
1863
                    return AVERROR_INVALIDDATA;
1864 1865 1866 1867 1868 1869 1870
                }
                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");
1871
                            return AVERROR_INVALIDDATA;
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
                        }
                        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) {
1884
                    av_log(s->avctx, AV_LOG_ERROR,
1885
                           "skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
1886
                    return AVERROR_INVALIDDATA;
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
                }

                /* 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
1915
    *buf += (get_bits_count(&s->gb) - 1) / 8;
1916
    ff_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1917 1918 1919 1920 1921
    return 0;
}

static int slice_decode_thread(AVCodecContext *c, void *arg)
{
1922
    MpegEncContext *s   = *(void **) arg;
1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
    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();
1935
        ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1936 1937 1938 1939 1940 1941
                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)
1942 1943 1944
                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);
1945
        } else {
1946 1947 1948
            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);
1949 1950 1951 1952 1953 1954
        }

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

        start_code = -1;
1955 1956
        buf        = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
        mb_y       = (start_code - SLICE_MIN_START_CODE) << field_pic;
1957 1958 1959
        if (s->picture_structure == PICT_BOTTOM_FIELD)
            mb_y++;
        if (mb_y < 0 || mb_y >= s->end_mb_y)
1960
            return AVERROR_INVALIDDATA;
1961 1962 1963 1964 1965 1966 1967 1968 1969
    }
}

/**
 * Handle slice ends.
 * @return 1 if it seems to be the last slice
 */
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
{
1970
    Mpeg1Context *s1  = avctx->priv_data;
1971 1972 1973 1974 1975 1976 1977
    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)
1978 1979
            av_log(avctx, AV_LOG_ERROR,
                   "hardware accelerator failed to decode picture\n");
1980 1981
    }

1982 1983
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
1984 1985
    if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
        ff_xvmc_field_end(s);
1986 1987
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
1988 1989

    /* end of slice reached */
1990
    if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
1991 1992 1993 1994
        /* end of image */

        ff_er_frame_end(&s->er);

1995
        ff_mpv_frame_end(s);
1996 1997

        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1998
            int ret = av_frame_ref(pict, s->current_picture_ptr->f);
1999 2000 2001 2002 2003 2004 2005 2006
            if (ret < 0)
                return ret;
            ff_print_debug_info(s, s->current_picture_ptr);
        } 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 */
2007
            if (s->last_picture_ptr) {
2008
                int ret = av_frame_ref(pict, s->last_picture_ptr->f);
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
                if (ret < 0)
                    return ret;
                ff_print_debug_info(s, s->last_picture_ptr);
            }
        }

        return 1;
    } else {
        return 0;
    }
}

static int mpeg1_decode_sequence(AVCodecContext *avctx,
                                 const uint8_t *buf, int buf_size)
{
2024
    Mpeg1Context *s1  = avctx->priv_data;
2025 2026 2027 2028
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int width, height;
    int i, v, j;

2029
    init_get_bits(&s->gb, buf, buf_size * 8);
2030 2031 2032 2033

    width  = get_bits(&s->gb, 12);
    height = get_bits(&s->gb, 12);
    if (width == 0 || height == 0) {
2034 2035
        av_log(avctx, AV_LOG_WARNING,
               "Invalid horizontal or vertical size value.\n");
2036 2037 2038 2039 2040 2041 2042
        if (avctx->err_recognition & AV_EF_BITSTREAM)
            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");
        if (avctx->err_recognition & AV_EF_BITSTREAM)
2043
            return AVERROR_INVALIDDATA;
2044 2045
    }
    s->frame_rate_index = get_bits(&s->gb, 4);
2046 2047 2048
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
        av_log(avctx, AV_LOG_WARNING,
               "frame_rate_index %d is invalid\n", s->frame_rate_index);
2049
        return AVERROR_INVALIDDATA;
2050
    }
2051
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2052 2053
    if (get_bits1(&s->gb) == 0) { /* marker */
        av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
2054
        return AVERROR_INVALIDDATA;
2055
    }
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066
    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++) {
2067
            j = s->idsp.idct_permutation[i];
2068 2069 2070 2071 2072 2073 2074 2075 2076
            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++) {
2077
            int j = s->idsp.idct_permutation[i];
2078 2079 2080 2081 2082 2083 2084 2085
            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");
2086
        return AVERROR_INVALIDDATA;
2087 2088
    }

2089
    /* We set MPEG-2 parameters so that it emulates MPEG-1. */
2090 2091 2092 2093 2094
    s->progressive_sequence = 1;
    s->progressive_frame    = 1;
    s->picture_structure    = PICT_FRAME;
    s->frame_pred_frame_dct = 1;
    s->chroma_format        = 1;
2095 2096
    s->codec_id             =
    s->avctx->codec_id      = AV_CODEC_ID_MPEG1VIDEO;
2097
    s->out_format           = FMT_MPEG1;
2098
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109
        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)
{
2110
    Mpeg1Context *s1  = avctx->priv_data;
2111
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2112
    int i, v, ret;
2113 2114 2115 2116

    /* start new MPEG-1 context decoding */
    s->out_format = FMT_MPEG1;
    if (s1->mpeg_enc_ctx_allocated) {
2117
        ff_mpv_common_end(s);
2118
    }
2119 2120
    s->width            = avctx->coded_width;
    s->height           = avctx->coded_height;
2121
    avctx->has_b_frames = 0; // true?
2122
    s->low_delay        = 1;
2123 2124 2125

    avctx->pix_fmt = mpeg_get_pixelformat(avctx);

2126 2127 2128 2129 2130 2131 2132
#if FF_API_XVMC
    if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) &&
        avctx->idct_algo == FF_IDCT_AUTO)
#else
    if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
#endif /* FF_API_XVMC */
        avctx->idct_algo = FF_IDCT_SIMPLE;
2133

2134
    ff_mpv_idct_init(s);
2135 2136
    if ((ret = ff_mpv_common_init(s)) < 0)
        return ret;
2137 2138 2139
    s1->mpeg_enc_ctx_allocated = 1;

    for (i = 0; i < 64; i++) {
2140
        int j = s->idsp.idct_permutation[i];
2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161
        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;
    s->frame_pred_frame_dct  = 1;
    s->chroma_format         = 1;
    s->codec_id              = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
    s1->save_width           = s->width;
    s1->save_height          = s->height;
    s1->save_progressive_seq = s->progressive_sequence;
    return 0;
}

2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174
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;
2175 2176
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
            if (s1->a53_caption)
2177 2178 2179 2180
                memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
        }
        return 1;
    } else if (buf_size >= 11 &&
2181
               p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
2182 2183 2184 2185
        /* extract DVD CC data */
        int cc_count = 0;
        int i;
        // There is a caption count field in the data, but it is often
2186
        // incorrect.  So count the number of captions present.
2187 2188 2189 2190 2191 2192
        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;
2193
            s1->a53_caption      = av_malloc(s1->a53_caption_size);
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
            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;
}

2215 2216 2217 2218
static void mpeg_decode_user_data(AVCodecContext *avctx,
                                  const uint8_t *p, int buf_size)
{
    const uint8_t *buf_end = p + buf_size;
2219
    Mpeg1Context *s1 = avctx->priv_data;
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232

    /* 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;
2233
#if FF_API_AFD
2234
FF_DISABLE_DEPRECATION_WARNINGS
2235
            avctx->dtg_active_format = p[0] & 0x0f;
2236
FF_ENABLE_DEPRECATION_WARNINGS
2237 2238 2239
#endif /* FF_API_AFD */
            s1->has_afd = 1;
            s1->afd     = p[0] & 0x0f;
2240
        }
2241 2242 2243 2244 2245 2246 2247 2248 2249 2250
    } 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) {
2251 2252

            s1->has_stereo3d = 1;
2253 2254 2255

            switch (S3D_video_format_type) {
            case 0x03:
2256
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
2257 2258
                break;
            case 0x04:
2259
                s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
2260 2261
                break;
            case 0x08:
2262
                s1->stereo3d.type = AV_STEREO3D_2D;
2263 2264
                break;
            case 0x23:
2265
                s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
2266 2267 2268
                break;
            }
        }
2269 2270
    } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
        return;
2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283
    }
}

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 time_code_hours, time_code_minutes;
    int time_code_seconds, time_code_pictures;
    int broken_link;

2284
    init_get_bits(&s->gb, buf, buf_size * 8);
2285 2286 2287 2288 2289 2290 2291 2292 2293 2294

    skip_bits1(&s->gb); /* drop_frame_flag */

    time_code_hours   = get_bits(&s->gb, 5);
    time_code_minutes = get_bits(&s->gb, 6);
    skip_bits1(&s->gb); // marker bit
    time_code_seconds  = get_bits(&s->gb, 6);
    time_code_pictures = get_bits(&s->gb, 6);

    s1->closed_gop = get_bits1(&s->gb);
2295 2296 2297
    /* broken_link indicate that after editing the
     * reference frames of the first B-Frames after GOP I-Frame
     * are missing (open gop) */
2298 2299 2300
    broken_link = get_bits1(&s->gb);

    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2301 2302
        av_log(s->avctx, AV_LOG_DEBUG,
               "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2303 2304 2305 2306
               time_code_hours, time_code_minutes, time_code_seconds,
               time_code_pictures, s1->closed_gop, broken_link);
}

2307 2308
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
                         int *got_output, const uint8_t *buf, int buf_size)
2309 2310 2311 2312 2313 2314
{
    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;
2315
    int last_code = 0, skip_frame = 0;
2316 2317 2318 2319 2320 2321

    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) {
2322
            if (!skip_frame) {
2323 2324
                if (HAVE_THREADS &&
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2325
                    !avctx->hwaccel) {
2326 2327
                    int i;

2328 2329 2330
                    avctx->execute(avctx, slice_decode_thread,
                                   &s2->thread_context[0], NULL,
                                   s->slice_count, sizeof(void *));
2331 2332 2333 2334 2335 2336 2337 2338
                    for (i = 0; i < s->slice_count; i++)
                        s2->er.error_count += s2->thread_context[i]->er.error_count;
                }

                ret = slice_end(avctx, picture);
                if (ret < 0)
                    return ret;
                else if (ret) {
2339 2340
                    // FIXME: merge with the stuff in mpeg_decode_slice
                    if (s2->last_picture_ptr || s2->low_delay)
2341 2342 2343 2344 2345 2346 2347 2348 2349
                        *got_output = 1;
                }
            }
            s2->pict_type = 0;
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
        }

        input_size = buf_end - buf_ptr;

2350
        if (avctx->debug & FF_DEBUG_STARTCODE)
2351
            av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
2352
                   start_code, buf_ptr - buf, input_size);
2353 2354 2355 2356 2357 2358

        /* 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);
2359
                s->sync = 1;
2360
            } else {
2361 2362
                av_log(avctx, AV_LOG_ERROR,
                       "ignoring SEQ_START_CODE after %X\n", last_code);
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;

        case PICTURE_START_CODE:
            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;
            }

2375 2376
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
                !avctx->hwaccel && s->slice_count) {
2377 2378 2379 2380
                int i;

                avctx->execute(avctx, slice_decode_thread,
                               s2->thread_context, NULL,
2381
                               s->slice_count, sizeof(void *));
2382 2383 2384 2385 2386 2387 2388
                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) {
2389 2390
                    av_log(avctx, AV_LOG_ERROR,
                           "mpeg_decode_postinit() failure\n");
2391 2392 2393
                    return ret;
                }

2394
                /* We have a complete image: we try to decompress it. */
2395 2396
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
                    s2->pict_type = 0;
2397
                s->first_slice = 1;
2398
                last_code      = PICTURE_START_CODE;
2399
            } else {
2400 2401
                av_log(avctx, AV_LOG_ERROR,
                       "ignoring pic after %X\n", last_code);
2402 2403 2404 2405 2406
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;
        case EXT_START_CODE:
2407
            init_get_bits(&s2->gb, buf_ptr, input_size * 8);
2408 2409 2410 2411

            switch (get_bits(&s2->gb, 4)) {
            case 0x1:
                if (last_code == 0) {
2412
                    mpeg_decode_sequence_extension(s);
2413
                } else {
2414 2415
                    av_log(avctx, AV_LOG_ERROR,
                           "ignoring seq ext after %X\n", last_code);
2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432
                    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 {
2433 2434
                    av_log(avctx, AV_LOG_ERROR,
                           "ignoring pic cod ext after %X\n", last_code);
2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445
                    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) {
2446
                s2->first_field = 0;
2447
                mpeg_decode_gop(avctx, buf_ptr, input_size);
2448
                s->sync = 1;
2449
            } else {
2450 2451
                av_log(avctx, AV_LOG_ERROR,
                       "ignoring GOP_START_CODE after %X\n", last_code);
2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;
        default:
            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;
                int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
                last_code = SLICE_MIN_START_CODE;

                if (s2->picture_structure == PICT_BOTTOM_FIELD)
                    mb_y++;

                if (mb_y >= s2->mb_height) {
2467 2468
                    av_log(s2->avctx, AV_LOG_ERROR,
                           "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
2469
                    return AVERROR_INVALIDDATA;
2470 2471
                }

2472
                if (!s2->last_picture_ptr) {
2473 2474
                    /* Skip B-frames if we do not have reference frames and
                     * GOP is not closed. */
2475
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2476 2477
                        if (!s->closed_gop) {
                            skip_frame = 1;
2478
                            break;
2479
                        }
2480 2481 2482
                    }
                }
                if (s2->pict_type == AV_PICTURE_TYPE_I)
2483
                    s->sync = 1;
2484
                if (!s2->next_picture_ptr) {
2485 2486
                    /* Skip P-frames if we do not have a reference frame or
                     * we have an invalid header. */
2487 2488 2489 2490
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
                        skip_frame = 1;
                        break;
                    }
2491
                }
2492 2493 2494 2495 2496
                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) {
2497
                    skip_frame = 1;
2498
                    break;
2499
                }
2500 2501 2502 2503 2504

                if (!s->mpeg_enc_ctx_allocated)
                    break;

                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
2505 2506
                    if (mb_y < avctx->skip_top ||
                        mb_y >= s2->mb_height - avctx->skip_bottom)
2507 2508 2509 2510 2511 2512 2513 2514 2515 2516
                        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;
                }

2517
                if (s->first_slice) {
2518
                    skip_frame     = 0;
2519
                    s->first_slice = 0;
2520 2521
                    if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
                        return ret;
2522 2523
                }
                if (!s2->current_picture_ptr) {
2524 2525
                    av_log(avctx, AV_LOG_ERROR,
                           "current_picture not initialized\n");
2526 2527 2528
                    return AVERROR_INVALIDDATA;
                }

2529 2530
                if (HAVE_THREADS &&
                    (avctx->active_thread_type & FF_THREAD_SLICE) &&
2531
                    !avctx->hwaccel) {
2532 2533 2534 2535 2536 2537 2538 2539 2540
                    int threshold = (s2->mb_height * s->slice_count +
                                     s2->slice_context_count / 2) /
                                    s2->slice_context_count;
                    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) {
2541 2542
                            s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
                            ret = ff_update_duplicate_context(thread_context, s2);
2543 2544 2545
                            if (ret < 0)
                                return ret;
                        }
2546
                        init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557
                        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)
2558 2559 2560
                            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);
2561
                    } else {
2562 2563 2564
                        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);
2565 2566 2567 2568 2569 2570 2571 2572
                    }
                }
            }
            break;
        }
    }
}

2573 2574
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
                             int *got_output, AVPacket *avpkt)
2575 2576 2577 2578 2579 2580
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    Mpeg1Context *s = avctx->priv_data;
    AVFrame *picture = data;
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2581
    ff_dlog(avctx, "fill_buffer\n");
2582 2583 2584 2585

    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) {
2586
            int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596
            if (ret < 0)
                return ret;

            s2->next_picture_ptr = NULL;

            *got_output = 1;
        }
        return buf_size;
    }

2597
    if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
2598 2599
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
                                           buf_size, NULL);
2600

2601 2602
        if (ff_combine_frame(&s2->parse_context, next,
                             (const uint8_t **) &buf, &buf_size) < 0)
2603 2604 2605 2606 2607 2608 2609 2610 2611
            return buf_size;
    }

    if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
        vcr2_init_sequence(avctx);

    s->slice_count = 0;

    if (avctx->extradata && !s->extradata_decoded) {
2612 2613
        int ret = decode_chunks(avctx, picture, got_output,
                                avctx->extradata, avctx->extradata_size);
2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625
        s->extradata_decoded = 1;
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
            return ret;
    }

    return decode_chunks(avctx, picture, got_output, buf, buf_size);
}

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

2626
    s->sync       = 0;
2627 2628 2629 2630 2631
    s->closed_gop = 0;

    ff_mpeg_flush(avctx);
}

2632
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2633 2634 2635 2636
{
    Mpeg1Context *s = avctx->priv_data;

    if (s->mpeg_enc_ctx_allocated)
2637
        ff_mpv_common_end(&s->mpeg_enc_ctx);
2638
    av_freep(&s->a53_caption);
2639 2640 2641 2642 2643
    return 0;
}

AVCodec ff_mpeg1video_decoder = {
    .name                  = "mpeg1video",
2644
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
2645 2646 2647 2648 2649 2650
    .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,
2651 2652 2653
    .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
                             AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
                             AV_CODEC_CAP_SLICE_THREADS,
2654 2655 2656 2657 2658 2659
    .flush                 = flush,
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
};

AVCodec ff_mpeg2video_decoder = {
    .name           = "mpeg2video",
2660
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
2661 2662 2663 2664 2665 2666
    .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,
2667 2668 2669
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
                      AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
                      AV_CODEC_CAP_SLICE_THREADS,
2670
    .flush          = flush,
2671
    .profiles       = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
2672 2673
};

2674
#if FF_API_XVMC
2675 2676 2677 2678 2679 2680 2681 2682
#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)) {
2683
        ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694
    }
    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",
2695
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
2696 2697 2698 2699 2700 2701
    .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,
2702
    .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2703
                      AV_CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL |
2704
                      AV_CODEC_CAP_DELAY,
2705 2706 2707 2708
    .flush          = flush,
};

#endif
2709
#endif /* FF_API_XVMC */