mpeg12.c 96.2 KB
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/*
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 * MPEG-1/2 decoder
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 * Copyright (c) 2000, 2001 Fabrice Bellard
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 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * MPEG-1/2 decoder
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 */
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#define UNCHECKED_BITSTREAM_READER 1

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//#define DEBUG
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#include "internal.h"
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#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
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#include "libavutil/avassert.h"
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#include "libavutil/timecode.h"
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#include "mpeg12.h"
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#include "mpeg12data.h"
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#include "mpeg12decdata.h"
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#include "bytestream.h"
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#include "vdpau_internal.h"
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#include "xvmc_internal.h"
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#include "thread.h"
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//#undef NDEBUG
//#include <assert.h>

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#define MV_VLC_BITS 9
#define MBINCR_VLC_BITS 9
#define MB_PAT_VLC_BITS 9
#define MB_PTYPE_VLC_BITS 6
#define MB_BTYPE_VLC_BITS 6

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static VLC mv_vlc;
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/* as H.263, but only 17 codes */
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
{
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    int code, sign, val, shift;
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    code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
    if (code == 0) {
        return pred;
    }
    if (code < 0) {
        return 0xffff;
    }
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    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;
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    /* modulo decoding */
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    return sign_extend(val, 5 + shift);
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}

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static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n)
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{
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    int level, dc, diff, i, j, run;
    int component;
    RLTable *rl = &ff_rl_mpeg1;
    uint8_t * const scantable    = s->intra_scantable.permutated;
    const uint16_t *quant_matrix = s->intra_matrix;
    const int qscale             = s->qscale;
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    /* DC coefficient */
    component = (n <= 3 ? 0 : n - 4 + 1);
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
        return -1;
    dc  = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc * quant_matrix[0];
    av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
    i = 0;
    {
        OPEN_READER(re, &s->gb);
        /* now quantify & encode AC coefficients */
        for (;;) {
            UPDATE_CACHE(re, &s->gb);
            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;
                j = scantable[i];
                level = (level * qscale * quant_matrix[j]) >> 4;
                level = (level - 1) | 1;
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                LAST_SKIP_BITS(re, &s->gb, 1);
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            } else {
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                /* escape */
                run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
                UPDATE_CACHE(re, &s->gb);
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
                if (level == -128) {
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
                } else if (level == 0) {
                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);
                }
                i += run;
                j = scantable[i];
                if (level < 0) {
                    level = -level;
                    level = (level * qscale * quant_matrix[j]) >> 4;
                    level = (level - 1) | 1;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
                    level = (level - 1) | 1;
                }
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            }
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            if (i > 63) {
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
                return -1;
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            }
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            block[j] = level;
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        }
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        CLOSE_READER(re, &s->gb);
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    }
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    s->block_last_index[n] = i;
   return 0;
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}

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

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static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
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{
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    int level, i, j, run;
    RLTable *rl = &ff_rl_mpeg1;
    uint8_t * const scantable    = s->intra_scantable.permutated;
    const uint16_t *quant_matrix = s->inter_matrix;
    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);
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
            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);
            if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                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);
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            if (level != 0) {
                i += run;
                j = scantable[i];
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                level = (level - 1) | 1;
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
                run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
                UPDATE_CACHE(re, &s->gb);
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
                if (level == -128) {
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
                } else if (level == 0) {
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
                }
                i += run;
                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;
                }
            }
            if (i > 63) {
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
                return -1;
            }
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            block[j] = level;
            if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
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    }
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    s->block_last_index[n] = i;
    return 0;
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}

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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
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{
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    int level, i, j, run;
    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);
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
            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);
            if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                goto end;
        }
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        /* now quantify & encode AC coefficients */
        for (;;) {
            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;
                j = scantable[i];
                level = ((level * 2 + 1) * qscale) >> 1;
                level = (level - 1) | 1;
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
                UPDATE_CACHE(re, &s->gb);
                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
                if (level == -128) {
                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
                } else if (level == 0) {
                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);
                }
                i += run;
                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;
                }
            }
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            block[j] = level;
            if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                break;
            UPDATE_CACHE(re, &s->gb);
        }
end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
    }
    s->block_last_index[n] = i;
    return 0;
}
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static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n)
{
    int level, i, j, run;
    RLTable *rl = &ff_rl_mpeg1;
    uint8_t * const scantable = s->intra_scantable.permutated;
    const uint16_t *quant_matrix;
    const int qscale = s->qscale;
    int mismatch;
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    mismatch = 1;
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    {
        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
        UPDATE_CACHE(re, &s->gb);
        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
            level= (3 * qscale * quant_matrix[0]) >> 5;
            if (GET_CACHE(re, &s->gb) & 0x40000000)
                level = -level;
            block[0]  = level;
            mismatch ^= level;
            i++;
            SKIP_BITS(re, &s->gb, 2);
            if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                goto end;
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        }
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        /* now quantify & encode AC coefficients */
        for (;;) {
            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;
                j = scantable[i];
                level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                SKIP_BITS(re, &s->gb, 1);
            } else {
                /* escape */
                run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
                UPDATE_CACHE(re, &s->gb);
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);

                i += run;
                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;
                }
            }
            if (i > 63) {
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
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                return -1;
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            }
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            mismatch ^= level;
            block[j]  = level;
            if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                break;
            UPDATE_CACHE(re, &s->gb);
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        }
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end:
        LAST_SKIP_BITS(re, &s->gb, 2);
        CLOSE_READER(re, &s->gb);
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    }
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    block[63] ^= (mismatch & 1);
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    s->block_last_index[n] = i;
    return 0;
}
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static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
                                                    DCTELEM *block, int n)
{
    int level, i, j, run;
    RLTable *rl = &ff_rl_mpeg1;
    uint8_t * const scantable = s->intra_scantable.permutated;
    const int qscale          = s->qscale;
    OPEN_READER(re, &s->gb);
    i = -1;
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    // special case for first coefficient, no need to add second VLC table
    UPDATE_CACHE(re, &s->gb);
    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
        level = (3 * qscale) >> 1;
        if (GET_CACHE(re, &s->gb) & 0x40000000)
            level = -level;
        block[0] = level;
        i++;
        SKIP_BITS(re, &s->gb, 2);
        if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
            goto end;
    }
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    /* now quantify & encode AC coefficients */
    for (;;) {
        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;
            j  = scantable[i];
            level = ((level * 2 + 1) * qscale) >> 1;
            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
            SKIP_BITS(re, &s->gb, 1);
        } else {
            /* escape */
            run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
            UPDATE_CACHE(re, &s->gb);
            level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
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            i += run;
            j  = scantable[i];
            if (level < 0) {
                level = ((-level * 2 + 1) * qscale) >> 1;
                level = -level;
            } else {
                level = ((level * 2 + 1) * qscale) >> 1;
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            }
        }
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        block[j] = level;
        if (((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
            break;
        UPDATE_CACHE(re, &s->gb);
    }
end:
    LAST_SKIP_BITS(re, &s->gb, 2);
    CLOSE_READER(re, &s->gb);
    s->block_last_index[n] = i;
    return 0;
}


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

    /* DC coefficient */
    if (n < 4) {
        quant_matrix = s->intra_matrix;
        component = 0;
    } else {
        quant_matrix = s->chroma_intra_matrix;
        component = (n & 1) + 1;
    }
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
        return -1;
    dc  = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc << (3 - s->intra_dc_precision);
    av_dlog(s->avctx, "dc=%d\n", block[0]);
    mismatch = block[0] ^ 1;
    i = 0;
    if (s->intra_vlc_format)
        rl = &ff_rl_mpeg2;
    else
        rl = &ff_rl_mpeg1;

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

            if (level == 127) {
                break;
            } else if (level != 0) {
                i += run;
                j  = scantable[i];
                level = (level * qscale * quant_matrix[j]) >> 4;
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                LAST_SKIP_BITS(re, &s->gb, 1);
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            } else {
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                /* escape */
                run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
                UPDATE_CACHE(re, &s->gb);
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
                i += run;
                j  = scantable[i];
                if (level < 0) {
                    level = (-level * qscale * quant_matrix[j]) >> 4;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
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                }
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            }
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            if (i > 63) {
                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
                return -1;
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            }
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            mismatch ^= level;
            block[j]  = level;
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        }
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        CLOSE_READER(re, &s->gb);
    }
    block[63] ^= mismatch & 1;

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

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

    /* DC coefficient */
    if (n < 4) {
        quant_matrix = s->intra_matrix;
        component = 0;
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    } else {
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        quant_matrix = s->chroma_intra_matrix;
        component = (n & 1) + 1;
    }
    diff = decode_dc(&s->gb, component);
    if (diff >= 0xffff)
        return -1;
    dc = s->last_dc[component];
    dc += diff;
    s->last_dc[component] = dc;
    block[0] = dc << (3 - s->intra_dc_precision);
    if (s->intra_vlc_format)
        rl = &ff_rl_mpeg2;
    else
        rl = &ff_rl_mpeg1;
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    {
        OPEN_READER(re, &s->gb);
        /* now quantify & encode AC coefficients */
        for (;;) {
            UPDATE_CACHE(re, &s->gb);
            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);

            if (level == 127) {
                break;
            } else if (level != 0) {
                scantable += run;
                j = *scantable;
                level = (level * qscale * quant_matrix[j]) >> 4;
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                LAST_SKIP_BITS(re, &s->gb, 1);
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            } else {
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                /* escape */
                run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6);
                UPDATE_CACHE(re, &s->gb);
                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
                scantable += run;
                j = *scantable;
                if (level < 0) {
                    level = (-level * qscale * quant_matrix[j]) >> 4;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
                }
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            }
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            block[j] = level;
        }
        CLOSE_READER(re, &s->gb);
    }
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    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
    return 0;
}

uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];

#define INIT_2D_VLC_RL(rl, static_size)\
{\
    static RL_VLC_ELEM rl_vlc_table[static_size];\
    INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
                    &rl.table_vlc[0][1], 4, 2,\
                    &rl.table_vlc[0][0], 4, 2, static_size);\
\
    rl.rl_vlc[0] = rl_vlc_table;\
    init_2d_vlc_rl(&rl);\
}

static void init_2d_vlc_rl(RLTable *rl)
{
    int i;

    for (i = 0; i < rl->vlc.table_size; i++) {
        int code = rl->vlc.table[i][0];
        int len  = rl->vlc.table[i][1];
        int level, run;

        if (len == 0) { // illegal code
            run   = 65;
            level = MAX_LEVEL;
        } else if (len<0) { //more bits needed
            run   = 0;
            level = code;
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        } else {
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            if (code == rl->n) { //esc
                run   = 65;
                level = 0;
            } else if (code == rl->n+1) { //eob
                run   = 0;
                level = 127;
            } else {
                run   = rl->table_run  [code] + 1;
                level = rl->table_level[code];
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            }
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        }
        rl->rl_vlc[0][i].len   = len;
        rl->rl_vlc[0][i].level = level;
        rl->rl_vlc[0][i].run   = run;
    }
}
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void ff_mpeg12_common_init(MpegEncContext *s)
{
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    s->y_dc_scale_table =
    s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
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}
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void ff_mpeg1_clean_buffers(MpegEncContext *s)
{
    s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
    s->last_dc[1] = s->last_dc[0];
    s->last_dc[2] = s->last_dc[0];
    memset(s->last_mv, 0, sizeof(s->last_mv));
}
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/******************************************/
/* decoding */
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VLC ff_dc_lum_vlc;
VLC ff_dc_chroma_vlc;
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static VLC mbincr_vlc;
static VLC mb_ptype_vlc;
static VLC mb_btype_vlc;
static VLC mb_pat_vlc;
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av_cold void ff_mpeg12_init_vlcs(void)
{
    static int done = 0;
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    if (!done) {
        done = 1;
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        INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
                        ff_mpeg12_vlc_dc_lum_bits, 1, 1,
                        ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
        INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
                        ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
                        ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
                        &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
                        &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
        INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
                        &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
                        &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
        INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
                        &ff_mpeg12_mbPatTable[0][1], 2, 1,
                        &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
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        INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
                        &table_mb_ptype[0][1], 2, 1,
                        &table_mb_ptype[0][0], 2, 1, 64);
        INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
                        &table_mb_btype[0][1], 2, 1,
                        &table_mb_btype[0][0], 2, 1, 64);
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        ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
        ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
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        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
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    }
}

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static inline int get_dmv(MpegEncContext *s)
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{
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    if (get_bits1(&s->gb))
        return 1 - (get_bits1(&s->gb) << 1);
    else
        return 0;
}
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static inline int get_qscale(MpegEncContext *s)
{
    int qscale = get_bits(&s->gb, 5);
    if (s->q_scale_type) {
        return non_linear_qscale[qscale];
    } else {
        return qscale << 1;
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    }
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}
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static void exchange_uv(MpegEncContext *s)
{
    DCTELEM (*tmp)[64];
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    tmp           = s->pblocks[4];
    s->pblocks[4] = s->pblocks[5];
    s->pblocks[5] = tmp;
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}

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/* motion type (for MPEG-2) */
#define MT_FIELD 1
#define MT_FRAME 2
#define MT_16X8  2
#define MT_DMV   3
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static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64])
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{
    int i, j, k, cbp, val, mb_type, motion_type;
    const int mb_block_count = 4 + (1 << s->chroma_format);
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    av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
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    assert(s->mb_skipped == 0);
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    if (s->mb_skip_run-- != 0) {
        if (s->pict_type == AV_PICTURE_TYPE_P) {
            s->mb_skipped = 1;
            s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
        } else {
            int mb_type;
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            if (s->mb_x)
                mb_type = s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
            else
                mb_type = s->current_picture.f.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
            if (IS_INTRA(mb_type))
                return -1;
            s->current_picture.f.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
                mb_type | MB_TYPE_SKIP;
//            assert(s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
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            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;
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        }
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        return 0;
    }

    switch (s->pict_type) {
    default:
    case AV_PICTURE_TYPE_I:
        if (get_bits1(&s->gb) == 0) {
            if (get_bits1(&s->gb) == 0) {
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
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                return -1;
            }
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            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
        } else {
            mb_type = MB_TYPE_INTRA;
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        }
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        break;
    case AV_PICTURE_TYPE_P:
        mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
        if (mb_type < 0) {
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
            return -1;
        }
        mb_type = ptype2mb_type[mb_type];
        break;
    case AV_PICTURE_TYPE_B:
        mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
        if (mb_type < 0) {
            av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
            return -1;
        }
        mb_type = btype2mb_type[mb_type];
        break;
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    }
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    av_dlog(s->avctx, "mb_type=%x\n", mb_type);
//    motion_type = 0; /* avoid warning */
    if (IS_INTRA(mb_type)) {
        s->dsp.clear_blocks(s->block[0]);
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        if (!s->chroma_y_shift) {
            s->dsp.clear_blocks(s->block[6]);
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        }

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        /* compute DCT type */
        if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
            !s->frame_pred_frame_dct) {
            s->interlaced_dct = get_bits1(&s->gb);
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        }

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        if (IS_QUANT(mb_type))
            s->qscale = get_qscale(s);
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        if (s->concealment_motion_vectors) {
            /* just parse them */
            if (s->picture_structure != PICT_FRAME)
                skip_bits1(&s->gb); /* field select */
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            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]);
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            skip_bits1(&s->gb); /* marker */
        } else
            memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
        s->mb_intra = 1;
        // if 1, we memcpy blocks in xvmcvideo
        if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
            ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
            if (s->swap_uv) {
                exchange_uv(s);
            }
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        }

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        if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
            if (s->flags2 & CODEC_FLAG2_FAST) {
                for (i = 0; i < 6; i++) {
                    mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
                }
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            } else {
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                for (i = 0; i < mb_block_count; i++) {
                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
                        return -1;
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                }
            }
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        } else {
            for (i = 0; i < 6; i++) {
                if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
                    return -1;
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            }
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        }
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    } else {
        if (mb_type & MB_TYPE_ZERO_MV) {
            assert(mb_type & MB_TYPE_CBP);
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            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 {
                s->mv_type = MV_TYPE_FIELD;
                mb_type |= MB_TYPE_INTERLACED;
                s->field_select[0][0] = s->picture_structure - 1;
            }
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            if (IS_QUANT(mb_type))
                s->qscale = get_qscale(s);
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            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;
            s->mv[0][0][0] = 0;
            s->mv[0][0][1] = 0;
        } else {
            assert(mb_type & MB_TYPE_L0L1);
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
            /* get additional motion vector type */
            if (s->frame_pred_frame_dct)
                motion_type = MT_FRAME;
            else {
                motion_type = get_bits(&s->gb, 2);
                if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
                    s->interlaced_dct = get_bits1(&s->gb);
            }
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            if (IS_QUANT(mb_type))
                s->qscale = get_qscale(s);
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            /* motion vectors */
            s->mv_dir = (mb_type >> 13) & 3;
            av_dlog(s->avctx, "motion_type=%d\n", motion_type);
            switch (motion_type) {
            case MT_FRAME: /* or MT_16X8 */
                if (s->picture_structure == PICT_FRAME) {
                    mb_type |= MB_TYPE_16x16;
                    s->mv_type = MV_TYPE_16X16;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            /* MT_FRAME */
                            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]);
                            /* full_pel: only for MPEG-1 */
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                            if (s->full_pel[i]) {
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                                s->mv[i][0][0] <<= 1;
                                s->mv[i][0][1] <<= 1;
                            }
                        }
                    }
                } else {
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
                    s->mv_type = MV_TYPE_16X8;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            /* MT_16X8 */
                            for (j = 0; j < 2; j++) {
                                s->field_select[i][j] = get_bits1(&s->gb);
                                for (k = 0; k < 2; k++) {
                                    val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
                                                             s->last_mv[i][j][k]);
                                    s->last_mv[i][j][k] = val;
                                    s->mv[i][j][k]      = val;
                                }
                            }
                        }
                    }
                }
                break;
            case MT_FIELD:
                s->mv_type = MV_TYPE_FIELD;
                if (s->picture_structure == PICT_FRAME) {
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
                    for (i = 0; i < 2; i++) {
                        if (USES_LIST(mb_type, i)) {
                            for (j = 0; j < 2; j++) {
                                s->field_select[i][j] = get_bits1(&s->gb);
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
                                                         s->last_mv[i][j][0]);
                                s->last_mv[i][j][0] = val;
                                s->mv[i][j][0]      = val;
                                av_dlog(s->avctx, "fmx=%d\n", val);
                                val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
                                                         s->last_mv[i][j][1] >> 1);
                                s->last_mv[i][j][1] = val << 1;
                                s->mv[i][j][1]      = val;
                                av_dlog(s->avctx, "fmy=%d\n", val);
                            }
                        }
                    }
                } else {
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                    av_assert0(!s->progressive_sequence);
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                    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:
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                if(s->progressive_sequence){
                    av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
                    return -1;
                }
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                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;
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                        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);
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                        s->last_mv[i][0][1] = my << my_shift;
                        s->last_mv[i][1][1] = my << my_shift;
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                        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
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                        if (s->picture_structure == PICT_FRAME) {
                            mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
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                            // m = 1 + 2 * s->top_field_first;
                            m = s->top_field_first ? 1 : 3;
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                            /* 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;
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                            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]++;
                        }
                    }
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                }
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                break;
            default:
                av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
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                return -1;
            }
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        }
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        s->mb_intra = 0;
        if (HAS_CBP(mb_type)) {
            s->dsp.clear_blocks(s->block[0]);
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            cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
            if (mb_block_count > 6) {
                 cbp <<= mb_block_count - 6;
                 cbp  |= get_bits(&s->gb, mb_block_count - 6);
                 s->dsp.clear_blocks(s->block[6]);
            }
            if (cbp <= 0) {
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
                return -1;
            }
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            //if 1, we memcpy blocks in xvmcvideo
            if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
                ff_xvmc_pack_pblocks(s, cbp);
                if (s->swap_uv) {
                    exchange_uv(s);
                }
            }
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            if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
                if (s->flags2 & CODEC_FLAG2_FAST) {
                    for (i = 0; i < 6; i++) {
                        if (cbp & 32) {
                            mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                } else {
                    cbp <<= 12-mb_block_count;
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                    for (i = 0; i < mb_block_count; i++) {
                        if (cbp & (1 << 11)) {
                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
                                return -1;
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                }
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            } else {
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                if (s->flags2 & CODEC_FLAG2_FAST) {
                    for (i = 0; i < 6; i++) {
                        if (cbp & 32) {
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
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                } else {
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                    for (i = 0; i < 6; i++) {
                        if (cbp & 32) {
                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
                                return -1;
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
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                }
            }
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        } else {
            for (i = 0; i < 12; i++)
                s->block_last_index[i] = -1;
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        }
    }
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    s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;

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    return 0;
}

1118
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
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{
    Mpeg1Context *s = avctx->priv_data;
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    MpegEncContext *s2 = &s->mpeg_enc_ctx;
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    int i;
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    /* we need some permutation to store matrices,
     * until MPV_common_init() sets the real permutation. */
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    for (i = 0; i < 64; i++)
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       s2->dsp.idct_permutation[i]=i;

1129
    ff_MPV_decode_defaults(s2);
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    s->mpeg_enc_ctx.avctx  = avctx;
    s->mpeg_enc_ctx.flags  = avctx->flags;
    s->mpeg_enc_ctx.flags2 = avctx->flags2;
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    ff_mpeg12_common_init(&s->mpeg_enc_ctx);
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    ff_mpeg12_init_vlcs();
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    s->mpeg_enc_ctx_allocated      = 0;
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    s->mpeg_enc_ctx.picture_number = 0;
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    s->repeat_field                = 0;
    s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
    avctx->color_range = AVCOL_RANGE_MPEG;
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    if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
    else
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
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    return 0;
}

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static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
{
    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;

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    if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized)
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        return 0;

    err = ff_mpeg_update_thread_context(avctx, avctx_from);
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    if (err) return err;
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1161
    if (!ctx->mpeg_enc_ctx_allocated)
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        memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));

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

    return 0;
}

1170
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
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                                 const uint8_t *new_perm)
{
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    uint16_t temp_matrix[64];
    int i;
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1176
    memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
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    for (i = 0; i < 64; i++) {
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        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
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    }
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}

1183
static const enum PixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
1184
#if CONFIG_MPEG_XVMC_DECODER
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    PIX_FMT_XVMC_MPEG2_IDCT,
    PIX_FMT_XVMC_MPEG2_MC,
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#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL
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    PIX_FMT_VDPAU_MPEG1,
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#endif
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    PIX_FMT_YUV420P,
    PIX_FMT_NONE
};

static const enum PixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
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#if CONFIG_MPEG_XVMC_DECODER
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    PIX_FMT_XVMC_MPEG2_IDCT,
    PIX_FMT_XVMC_MPEG2_MC,
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#endif
#if CONFIG_MPEG2_VDPAU_HWACCEL
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    PIX_FMT_VDPAU_MPEG2,
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#endif
#if CONFIG_MPEG2_DXVA2_HWACCEL
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    PIX_FMT_DXVA2_VLD,
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#endif
#if CONFIG_MPEG2_VAAPI_HWACCEL
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    PIX_FMT_VAAPI_VLD,
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#endif
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    PIX_FMT_YUV420P,
    PIX_FMT_NONE
};

static inline int uses_vdpau(AVCodecContext *avctx) {
    return avctx->pix_fmt == PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == PIX_FMT_VDPAU_MPEG2;
}

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static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
{
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    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;

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    if(s->chroma_format < 2) {
        enum PixelFormat res;
        res = avctx->get_format(avctx,
                                avctx->codec_id == CODEC_ID_MPEG1VIDEO ?
                                mpeg1_hwaccel_pixfmt_list_420 :
                                mpeg2_hwaccel_pixfmt_list_420);
        if (res != PIX_FMT_XVMC_MPEG2_IDCT && res != PIX_FMT_XVMC_MPEG2_MC) {
            avctx->xvmc_acceleration = 0;
        } else if (!avctx->xvmc_acceleration) {
            avctx->xvmc_acceleration = 2;
        }
        return res;
    } else if(s->chroma_format == 2)
        return PIX_FMT_YUV422P;
    else
        return PIX_FMT_YUV444P;
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}

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/* Call this function when we know all parameters.
 * It may be called in different places for MPEG-1 and MPEG-2. */
1242 1243
static int mpeg_decode_postinit(AVCodecContext *avctx)
{
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    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    uint8_t old_permutation[64];
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    if ((s1->mpeg_enc_ctx_allocated == 0) ||
        avctx->coded_width  != s->width   ||
        avctx->coded_height != s->height  ||
        s1->save_width           != s->width                ||
        s1->save_height          != s->height               ||
        s1->save_aspect_info     != s->aspect_ratio_info    ||
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        s1->save_progressive_seq != s->progressive_sequence ||
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        0)
    {
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        if (s1->mpeg_enc_ctx_allocated) {
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            ParseContext pc = s->parse_context;
            s->parse_context.buffer = 0;
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            ff_MPV_common_end(s);
1262
            s->parse_context = pc;
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        }

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        if ((s->width == 0) || (s->height == 0))
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            return -2;
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        avcodec_set_dimensions(avctx, s->width, s->height);
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        avctx->bit_rate          = s->bit_rate;
        s1->save_aspect_info     = s->aspect_ratio_info;
        s1->save_width           = s->width;
        s1->save_height          = s->height;
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        s1->save_progressive_seq = s->progressive_sequence;
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        /* low_delay may be forced, in this case we will have B-frames
         * that behave like P-frames. */
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        avctx->has_b_frames = !s->low_delay;
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1279
        if (avctx->codec_id == CODEC_ID_MPEG1VIDEO) {
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            //MPEG-1 fps
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            avctx->time_base.den = avpriv_frame_rate_tab[s->frame_rate_index].num;
            avctx->time_base.num = avpriv_frame_rate_tab[s->frame_rate_index].den;
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            //MPEG-1 aspect
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            avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
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            avctx->ticks_per_frame=1;
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        } else {//MPEG-2
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        //MPEG-2 fps
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            av_reduce(&s->avctx->time_base.den,
                      &s->avctx->time_base.num,
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                      avpriv_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
                      avpriv_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
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                      1 << 30);
            avctx->ticks_per_frame = 2;
            //MPEG-2 aspect
            if (s->aspect_ratio_info > 1) {
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                AVRational dar =
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                    av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
                                      (AVRational) {s1->pan_scan.width, s1->pan_scan.height}),
                             (AVRational) {s->width, s->height});
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                // we ignore the spec here and guess a bit as reality does not match the spec, see for example
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                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
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                // issue1613, 621, 562
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                if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
                   (av_cmp_q(dar, (AVRational) {4, 3}) && av_cmp_q(dar, (AVRational) {16, 9}))) {
                    s->avctx->sample_aspect_ratio =
                        av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
                                 (AVRational) {s->width, s->height});
                } else {
                    s->avctx->sample_aspect_ratio =
                        av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
                                 (AVRational) {s1->pan_scan.width, s1->pan_scan.height});
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//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
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//                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
//av_log(NULL, AV_LOG_ERROR, "A %d/%d\n", ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
//av_log(NULL, AV_LOG_ERROR, "B %d/%d\n", s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den);
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                }
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            } else {
                s->avctx->sample_aspect_ratio =
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                    ff_mpeg2_aspect[s->aspect_ratio_info];
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            }
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        } // MPEG-2
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        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
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        avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
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        // until then pix_fmt may be changed right after codec init
        if (avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
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            avctx->hwaccel )
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            if (avctx->idct_algo == FF_IDCT_AUTO)
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                avctx->idct_algo = FF_IDCT_SIMPLE;

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        /* Quantization matrices may need reordering
         * if DCT permutation is changed. */
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        memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
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        if (ff_MPV_common_init(s) < 0)
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            return -2;

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        quant_matrix_rebuild(s->intra_matrix,        old_permutation, s->dsp.idct_permutation);
        quant_matrix_rebuild(s->inter_matrix,        old_permutation, s->dsp.idct_permutation);
        quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
        quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.idct_permutation);
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        s1->mpeg_enc_ctx_allocated = 1;
    }
    return 0;
}

1351
static int mpeg1_decode_picture(AVCodecContext *avctx,
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1352
                                const uint8_t *buf, int buf_size)
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{
    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
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    int ref, f_code, vbv_delay;
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1358
    init_get_bits(&s->gb, buf, buf_size*8);
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    ref = get_bits(&s->gb, 10); /* temporal ref */
    s->pict_type = get_bits(&s->gb, 3);
1362
    if (s->pict_type == 0 || s->pict_type > 3)
1363
        return -1;
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1365
    vbv_delay = get_bits(&s->gb, 16);
1366
    if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
1367
        s->full_pel[0] = get_bits1(&s->gb);
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        f_code = get_bits(&s->gb, 3);
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        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
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            return -1;
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        f_code += !f_code;
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        s->mpeg_f_code[0][0] = f_code;
        s->mpeg_f_code[0][1] = f_code;
    }
1375
    if (s->pict_type == AV_PICTURE_TYPE_B) {
1376
        s->full_pel[1] = get_bits1(&s->gb);
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        f_code = get_bits(&s->gb, 3);
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        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
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            return -1;
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        f_code += !f_code;
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        s->mpeg_f_code[1][0] = f_code;
        s->mpeg_f_code[1][1] = f_code;
    }
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    s->current_picture.f.pict_type = s->pict_type;
    s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
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    if (avctx->debug & FF_DEBUG_PICT_INFO)
1388
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
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    s->y_dc_scale = 8;
    s->c_dc_scale = 8;
    return 0;
}

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static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
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{
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    MpegEncContext *s= &s1->mpeg_enc_ctx;
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    int horiz_size_ext, vert_size_ext;
1399
    int bit_rate_ext;
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1401
    skip_bits(&s->gb, 1); /* profile and level esc*/
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    s->avctx->profile       = get_bits(&s->gb, 3);
    s->avctx->level         = get_bits(&s->gb, 4);
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    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
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    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);
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    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
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    s->bit_rate += (bit_rate_ext << 18) * 400;
1412
    skip_bits1(&s->gb); /* marker */
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    s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
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1415
    s->low_delay = get_bits1(&s->gb);
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    if (s->flags & CODEC_FLAG_LOW_DELAY)
        s->low_delay = 1;
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    s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
    s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
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1422
    av_dlog(s->avctx, "sequence extension\n");
1423
    s->codec_id      = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
1424

1425
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1426
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1427
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
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}

1431 1432
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
{
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    MpegEncContext *s = &s1->mpeg_enc_ctx;
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    int color_description, w, h;

    skip_bits(&s->gb, 3); /* video format */
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    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);
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    }
1443
    w = get_bits(&s->gb, 14);
1444
    skip_bits(&s->gb, 1); //marker
1445
    h = get_bits(&s->gb, 14);
1446
    // remaining 3 bits are zero padding
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    s1->pan_scan.width  = 16 * w;
    s1->pan_scan.height = 16 * h;
1450

1451
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1452
        av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
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}

static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
{
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    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int i, nofco;
1459 1460

    nofco = 1;
1461 1462
    if (s->progressive_sequence) {
        if (s->repeat_first_field) {
1463
            nofco++;
1464
            if (s->top_field_first)
1465 1466
                nofco++;
        }
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    } else {
        if (s->picture_structure == PICT_FRAME) {
1469
            nofco++;
1470
            if (s->repeat_first_field)
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                nofco++;
        }
1473
    }
1474 1475 1476 1477 1478
    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
1479
    }
1480

1481
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1482
        av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
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               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]);
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}

1488 1489
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra)
{
1490 1491
    int i;

1492 1493
    for (i = 0; i < 64; i++) {
        int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1494
        int v = get_bits(&s->gb, 8);
1495
        if (v == 0) {
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            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
            return -1;
        }
1499
        if (intra && i == 0 && v != 8) {
1500
            av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
1501
            v = 8; // needed by pink.mpg / issue1046
1502
        }
1503
        matrix0[j] = v;
1504
        if (matrix1)
1505 1506 1507 1508 1509
            matrix1[j] = v;
    }
    return 0;
}

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static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
{
1512
    av_dlog(s->avctx, "matrix extension\n");
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    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);
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}

1520
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
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1521
{
1522
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1523

1524
    s->full_pel[0] = s->full_pel[1] = 0;
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    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);
1529
    if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
1530
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
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        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;
1534
            else
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                s->pict_type = AV_PICTURE_TYPE_P;
        } else
            s->pict_type = AV_PICTURE_TYPE_B;
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        s->current_picture.f.pict_type = s->pict_type;
        s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
1540
    }
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    s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
    s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
    s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
    s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];

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    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);
1550
    s->concealment_motion_vectors = get_bits1(&s->gb);
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    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;
1560 1561 1562
        av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
    }

1563
    if (s->picture_structure == 0 || (s->progressive_frame && s->picture_structure != PICT_FRAME)) {
1564
        av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1565
        s->picture_structure = PICT_FRAME;
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    }

1568
    if (s->progressive_sequence && !s->frame_pred_frame_dct) {
1569
        av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
1570 1571
    }

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    if (s->picture_structure == PICT_FRAME) {
        s->first_field = 0;
        s->v_edge_pos  = 16 * s->mb_height;
    } else {
1576
        s->first_field ^= 1;
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        s->v_edge_pos   = 8 * s->mb_height;
        memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
1579
    }
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1581 1582 1583 1584 1585 1586
    if (s->alternate_scan) {
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
    } else {
        ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
        ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
1587
    }
1588

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1589
    /* composite display not parsed */
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    av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
    av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
    av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
    av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
    av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
    av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
    av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
    av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
    av_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
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}

1601 1602 1603
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
{
    AVCodecContext *avctx = s->avctx;
1604
    Mpeg1Context *s1 = (Mpeg1Context*)s;
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1605 1606

    /* start frame decoding */
1607
    if (s->first_field || s->picture_structure == PICT_FRAME) {
1608
        if (ff_MPV_frame_start(s, avctx) < 0)
1609
            return -1;
1610 1611 1612

        ff_er_frame_start(s);

1613
        /* first check if we must repeat the frame */
1614
        s->current_picture_ptr->f.repeat_pict = 0;
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        if (s->repeat_first_field) {
            if (s->progressive_sequence) {
                if (s->top_field_first)
1618
                    s->current_picture_ptr->f.repeat_pict = 4;
1619
                else
1620
                    s->current_picture_ptr->f.repeat_pict = 2;
1621
            } else if (s->progressive_frame) {
1622
                s->current_picture_ptr->f.repeat_pict = 1;
1623
            }
1624
        }
1625

1626
        *s->current_picture_ptr->f.pan_scan = s1->pan_scan;
1627

1628
        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
1629
            ff_thread_finish_setup(avctx);
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    } else { // second field
        int i;
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1633 1634 1635 1636
        if (!s->current_picture_ptr) {
            av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
            return -1;
        }
1637

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

1644 1645 1646 1647
        for (i = 0; i < 4; i++) {
            s->current_picture.f.data[i] = s->current_picture_ptr->f.data[i];
            if (s->picture_structure == PICT_BOTTOM_FIELD) {
                s->current_picture.f.data[i] += s->current_picture_ptr->f.linesize[i];
1648
            }
1649
        }
1650
    }
1651 1652 1653 1654 1655 1656

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

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1657 1658
// MPV_frame_start will call this function too,
// but we need to call it on every field
1659 1660
    if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
        if (ff_xvmc_field_start(s, avctx) < 0)
1661
            return -1;
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1663 1664 1665 1666
    return 0;
}

#define DECODE_SLICE_ERROR -1
1667
#define DECODE_SLICE_OK     0
1668 1669

/**
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 * 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
1674
 */
1675
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
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1676
                             const uint8_t **buf, int buf_size)
1677
{
1678
    AVCodecContext *avctx = s->avctx;
1679
    const int lowres      = s->avctx->lowres;
1680
    const int field_pic   = s->picture_structure != PICT_FRAME;
1681

1682 1683
    s->resync_mb_x =
    s->resync_mb_y = -1;
1684

1685
    assert(mb_y < s->mb_height);
1686

1687
    init_get_bits(&s->gb, *buf, buf_size * 8);
1688 1689
    if(s->codec_id != CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
        skip_bits(&s->gb, 3);
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1690

1691 1692 1693
    ff_mpeg1_clean_buffers(s);
    s->interlaced_dct = 0;

1694
    s->qscale = get_qscale(s);
1695

1696
    if (s->qscale == 0) {
1697
        av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1698
        return -1;
1699
    }
1700

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1701
    /* extra slice info */
1702 1703
    while (get_bits1(&s->gb) != 0) {
        skip_bits(&s->gb, 8);
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1704
    }
1705

1706
    s->mb_x = 0;
1707

1708
    if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
1709
        skip_bits1(&s->gb);
1710
    } else {
1711
        while (get_bits_left(&s->gb) > 0) {
1712
            int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1713
            if (code < 0) {
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724
                av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
                return -1;
            }
            if (code >= 33) {
                if (code == 33) {
                    s->mb_x += 33;
                }
                /* otherwise, stuffing, nothing to do */
            } else {
                s->mb_x += code;
                break;
1725 1726 1727
            }
        }
    }
1728

1729
    if (s->mb_x >= (unsigned)s->mb_width) {
1730 1731 1732
        av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
        return -1;
    }
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1734 1735 1736
    if (avctx->hwaccel) {
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
        int start_code = -1;
1737
        buf_end = avpriv_mpv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
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        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;
    }

1747 1748 1749
    s->resync_mb_x = s->mb_x;
    s->resync_mb_y = s->mb_y = mb_y;
    s->mb_skip_run = 0;
1750
    ff_init_block_index(s);
1751

1752 1753
    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) {
1754
             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",
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                    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" :"");
1760
        }
1761 1762
    }

1763 1764 1765 1766
    for (;;) {
        // 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
1767

1768
        if (mpeg_decode_mb(s, s->block) < 0)
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1769
            return -1;
1770

1771
        if (s->current_picture.f.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
1772
            const int wrap = s->b8_stride;
1773 1774
            int xy         = s->mb_x * 2 + s->mb_y * 2 * wrap;
            int b8_xy      = 4 * (s->mb_x + s->mb_y * s->mb_stride);
1775
            int motion_x, motion_y, dir, i;
1776

1777 1778 1779
            for (i = 0; i < 2; i++) {
                for (dir = 0; dir < 2; dir++) {
                    if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
1780
                        motion_x = motion_y = 0;
1781
                    } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
1782 1783 1784 1785 1786 1787
                        motion_x = s->mv[dir][0][0];
                        motion_y = s->mv[dir][0][1];
                    } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
                        motion_x = s->mv[dir][i][0];
                        motion_y = s->mv[dir][i][1];
                    }
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1789 1790 1791 1792 1793 1794
                    s->current_picture.f.motion_val[dir][xy    ][0] = motion_x;
                    s->current_picture.f.motion_val[dir][xy    ][1] = motion_y;
                    s->current_picture.f.motion_val[dir][xy + 1][0] = motion_x;
                    s->current_picture.f.motion_val[dir][xy + 1][1] = motion_y;
                    s->current_picture.f.ref_index [dir][b8_xy    ] =
                    s->current_picture.f.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1795
                    assert(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1796
                }
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1797
                xy += wrap;
1798
                b8_xy +=2;
1799 1800
            }
        }
1801

1802 1803 1804
        s->dest[0] += 16 >> lowres;
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1805

1806
        ff_MPV_decode_mb(s, s->block);
1807

1808
        if (++s->mb_x >= s->mb_width) {
1809
            const int mb_size = 16 >> s->avctx->lowres;
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1810

1811
            ff_draw_horiz_band(s, mb_size*(s->mb_y >> field_pic), mb_size);
1812
            ff_MPV_report_decode_progress(s);
1813 1814

            s->mb_x = 0;
1815
            s->mb_y += 1 << field_pic;
1816

1817 1818 1819 1820 1821
            if (s->mb_y >= s->mb_height) {
                int left   = get_bits_left(&s->gb);
                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*/;
1822

1823
                if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1824
                    || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
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1825
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1826
                    return -1;
1827
                } else
1828 1829
                    goto eos;
            }
1830

1831
            ff_init_block_index(s);
1832 1833 1834
        }

        /* skip mb handling */
1835
        if (s->mb_skip_run == -1) {
1836
            /* read increment again */
1837
            s->mb_skip_run = 0;
1838
            for (;;) {
1839
                int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1840
                if (code < 0) {
1841
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1842
                    return -1;
1843
                }
1844 1845
                if (code >= 33) {
                    if (code == 33) {
1846
                        s->mb_skip_run += 33;
1847 1848
                    } else if (code == 35) {
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
1849
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1850 1851 1852
                            return -1;
                        }
                        goto eos; /* end of slice */
1853 1854 1855
                    }
                    /* otherwise, stuffing, nothing to do */
                } else {
1856
                    s->mb_skip_run += code;
1857 1858 1859
                    break;
                }
            }
1860
            if (s->mb_skip_run) {
1861
                int i;
1862
                if (s->pict_type == AV_PICTURE_TYPE_I) {
1863 1864 1865 1866 1867 1868
                    av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
                    return -1;
                }

                /* skip mb */
                s->mb_intra = 0;
1869
                for (i = 0; i < 12; i++)
1870
                    s->block_last_index[i] = -1;
1871
                if (s->picture_structure == PICT_FRAME)
1872 1873 1874
                    s->mv_type = MV_TYPE_16X16;
                else
                    s->mv_type = MV_TYPE_FIELD;
1875
                if (s->pict_type == AV_PICTURE_TYPE_P) {
1876
                    /* if P type, zero motion vector is implied */
1877 1878 1879 1880 1881
                    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;
1882 1883 1884 1885 1886 1887 1888 1889
                } 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];
                }
            }
1890
        }
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1891
    }
1892
eos: // end of slice
1893
    *buf += (get_bits_count(&s->gb)-1)/8;
1894
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1895 1896
    return 0;
}
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1898 1899 1900 1901 1902 1903
static int slice_decode_thread(AVCodecContext *c, void *arg)
{
    MpegEncContext *s   = *(void**)arg;
    const uint8_t *buf  = s->gb.buffer;
    int mb_y            = s->start_mb_y;
    const int field_pic = s->picture_structure != PICT_FRAME;
1904

1905
    s->error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
1906

1907
    for (;;) {
1908 1909
        uint32_t start_code;
        int ret;
1910

1911
        ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
1912
        emms_c();
1913
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1914
//ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1915
        if (ret < 0) {
1916
            if (c->err_recognition & AV_EF_EXPLODE)
1917
                return ret;
1918
            if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
1919
                ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
1920
        } else {
1921
            ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
1922
        }
1923

1924
        if (s->mb_y == s->end_mb_y)
1925
            return 0;
1926

1927
        start_code = -1;
1928
        buf = avpriv_mpv_find_start_code(buf, s->gb.buffer_end, &start_code);
1929 1930 1931 1932
        mb_y= start_code - SLICE_MIN_START_CODE;
        if(s->codec_id != CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
            mb_y += (*buf&0xE0)<<2;
        mb_y <<= field_pic;
1933 1934
        if (s->picture_structure == PICT_BOTTOM_FIELD)
            mb_y++;
1935
        if (mb_y < 0 || mb_y >= s->end_mb_y)
1936 1937 1938 1939
            return -1;
    }
}

1940
/**
1941
 * Handle slice ends.
1942
 * @return 1 if it seems to be the last slice
1943 1944 1945 1946 1947
 */
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
{
    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1948

1949
    if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1950 1951
        return 0;

1952 1953 1954 1955 1956
    if (s->avctx->hwaccel) {
        if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
            av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
    }

1957
    if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1958
        ff_xvmc_field_end(s);
1959

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1960
    /* end of slice reached */
1961
    if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
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1962
        /* end of image */
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1963

1964
        s->current_picture_ptr->f.qscale_type = FF_QSCALE_TYPE_MPEG2;
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1965

1966
        ff_er_frame_end(s);
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1967

1968
        ff_MPV_frame_end(s);
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1969

1970
        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1971
            *pict = s->current_picture_ptr->f;
1972
            ff_print_debug_info(s, pict);
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1973
        } else {
1974
            if (avctx->active_thread_type & FF_THREAD_FRAME)
1975
                s->picture_number++;
1976
            /* latency of 1 frame for I- and P-frames */
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1977
            /* XXX: use another variable than picture_number */
1978
            if (s->last_picture_ptr != NULL) {
1979
                *pict = s->last_picture_ptr->f;
1980
                 ff_print_debug_info(s, pict);
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1981 1982
            }
        }
1983 1984 1985 1986

        return 1;
    } else {
        return 0;
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1987 1988 1989
    }
}

1990
static int mpeg1_decode_sequence(AVCodecContext *avctx,
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1991
                                 const uint8_t *buf, int buf_size)
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1992 1993 1994
{
    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
1995
    int width, height;
1996
    int i, v, j;
1997

1998
    init_get_bits(&s->gb, buf, buf_size*8);
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1999

2000
    width  = get_bits(&s->gb, 12);
2001
    height = get_bits(&s->gb, 12);
2002
    if (width <= 0 || height <= 0)
2003
        return -1;
2004
    s->aspect_ratio_info = get_bits(&s->gb, 4);
2005 2006
    if (s->aspect_ratio_info == 0) {
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
2007
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
2008 2009
            return -1;
    }
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2010
    s->frame_rate_index = get_bits(&s->gb, 4);
2011
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
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2012 2013
        return -1;
    s->bit_rate = get_bits(&s->gb, 18) * 400;
2014
    if (get_bits1(&s->gb) == 0) /* marker */
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2015
        return -1;
2016
    s->width  = width;
2017
    s->height = height;
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2018

2019
    s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
2020
    skip_bits(&s->gb, 1);
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2021 2022

    /* get matrix */
2023
    if (get_bits1(&s->gb)) {
2024
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
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2025
    } else {
2026
        for (i = 0; i < 64; i++) {
2027
            j = s->dsp.idct_permutation[i];
2028
            v = ff_mpeg1_default_intra_matrix[i];
2029
            s->intra_matrix[j]        = v;
2030
            s->chroma_intra_matrix[j] = v;
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2031 2032
        }
    }
2033
    if (get_bits1(&s->gb)) {
2034
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
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2035
    } else {
2036 2037
        for (i = 0; i < 64; i++) {
            int j = s->dsp.idct_permutation[i];
2038
            v = ff_mpeg1_default_non_intra_matrix[i];
2039
            s->inter_matrix[j]        = v;
2040
            s->chroma_inter_matrix[j] = v;
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2041 2042
        }
    }
2043

2044
    if (show_bits(&s->gb, 23) != 0) {
2045 2046 2047
        av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
        return -1;
    }
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2048

2049
    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
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2050
    s->progressive_sequence = 1;
2051 2052
    s->progressive_frame    = 1;
    s->picture_structure    = PICT_FRAME;
2053
    s->first_field          = 0;
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2054
    s->frame_pred_frame_dct = 1;
2055 2056 2057 2058 2059 2060 2061 2062
    s->chroma_format        = 1;
    s->codec_id             = s->avctx->codec_id = CODEC_ID_MPEG1VIDEO;
    s->out_format           = FMT_MPEG1;
    s->swap_uv              = 0; // AFAIK VCR2 does not have SEQ_HEADER
    if (s->flags & CODEC_FLAG_LOW_DELAY)
        s->low_delay = 1;

    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2063
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2064
               s->avctx->rc_buffer_size, s->bit_rate);
2065

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2066 2067 2068
    return 0;
}

2069 2070 2071 2072
static int vcr2_init_sequence(AVCodecContext *avctx)
{
    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
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2073
    int i, v;
2074

2075
    /* start new MPEG-1 context decoding */
2076 2077
    s->out_format = FMT_MPEG1;
    if (s1->mpeg_enc_ctx_allocated) {
2078
        ff_MPV_common_end(s);
2079
    }
2080 2081
    s->width  = avctx->coded_width;
    s->height = avctx->coded_height;
2082 2083
    avctx->has_b_frames = 0; // true?
    s->low_delay = 1;
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2084

2085
    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2086
    avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
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2087

2088
    if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel )
2089
        if (avctx->idct_algo == FF_IDCT_AUTO)
2090
            avctx->idct_algo = FF_IDCT_SIMPLE;
2091

2092
    if (ff_MPV_common_init(s) < 0)
2093 2094 2095
        return -1;
    s1->mpeg_enc_ctx_allocated = 1;

2096 2097
    for (i = 0; i < 64; i++) {
        int j = s->dsp.idct_permutation[i];
2098
        v = ff_mpeg1_default_intra_matrix[i];
2099
        s->intra_matrix[j]        = v;
2100 2101 2102
        s->chroma_intra_matrix[j] = v;

        v = ff_mpeg1_default_non_intra_matrix[i];
2103
        s->inter_matrix[j]        = v;
2104 2105 2106
        s->chroma_inter_matrix[j] = v;
    }

2107 2108 2109
    s->progressive_sequence  = 1;
    s->progressive_frame     = 1;
    s->picture_structure     = PICT_FRAME;
2110
    s->first_field           = 0;
2111 2112
    s->frame_pred_frame_dct  = 1;
    s->chroma_format         = 1;
2113 2114 2115 2116 2117 2118 2119
    if (s->codec_tag == AV_RL32("BW10")) {
        s->codec_id              = s->avctx->codec_id = CODEC_ID_MPEG1VIDEO;
    } else {
        exchange_uv(s); // common init reset pblocks, so we swap them here
        s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
        s->codec_id              = s->avctx->codec_id = CODEC_ID_MPEG2VIDEO;
    }
2120 2121 2122
    s1->save_width           = s->width;
    s1->save_height          = s->height;
    s1->save_progressive_seq = s->progressive_sequence;
2123 2124 2125 2126
    return 0;
}


2127
static void mpeg_decode_user_data(AVCodecContext *avctx,
2128
                                  const uint8_t *p, int buf_size)
2129
{
2130
    Mpeg1Context *s = avctx->priv_data;
2131
    const uint8_t *buf_end = p + buf_size;
2132

2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145
    if(buf_size > 29){
        int i;
        for(i=0; i<20; i++)
            if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
                s->tmpgexs= 1;
            }

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

2146
    /* we parse the DTG active format information */
2147
    if (buf_end - p >= 5 &&
2148
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2149
        int flags = p[4];
2150 2151 2152 2153 2154 2155
        p += 5;
        if (flags & 0x80) {
            /* skip event id */
            p += 2;
        }
        if (flags & 0x40) {
2156
            if (buf_end - p < 1)
2157 2158 2159 2160 2161 2162
                return;
            avctx->dtg_active_format = p[0] & 0x0f;
        }
    }
}

2163
static void mpeg_decode_gop(AVCodecContext *avctx,
2164 2165 2166
                            const uint8_t *buf, int buf_size)
{
    Mpeg1Context *s1  = avctx->priv_data;
2167
    MpegEncContext *s = &s1->mpeg_enc_ctx;
2168
    int broken_link;
2169
    int64_t tc;
2170 2171 2172

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

2173
    tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2174

2175
    s->closed_gop = get_bits1(&s->gb);
2176 2177 2178 2179 2180
    /*broken_link indicate that after editing the
      reference frames of the first B-Frames after GOP I-Frame
      are missing (open gop)*/
    broken_link = get_bits1(&s->gb);

2181
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2182 2183 2184 2185 2186
        char tcbuf[AV_TIMECODE_STR_SIZE];
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
        av_log(s->avctx, AV_LOG_DEBUG,
               "GOP (%s) closed_gop=%d broken_link=%d\n",
               tcbuf, s->closed_gop, broken_link);
2187
    }
2188
}
2189
/**
2190
 * Find the end of the current frame in the bitstream.
2191 2192
 * @return the position of the first byte of the next frame, or -1
 */
2193
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2194
{
2195
    int i;
2196
    uint32_t state = pc->state;
2197

2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
    /* EOF considered as end of frame */
    if (buf_size == 0)
        return 0;

/*
 0  frame start         -> 1/4
 1  first_SEQEXT        -> 0/2
 2  first field start   -> 3/0
 3  second_SEQEXT       -> 2/0
 4  searching end
*/

2210 2211 2212 2213
    for (i = 0; i < buf_size; i++) {
        assert(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
        if (pc->frame_start_found & 1) {
            if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
2214
                pc->frame_start_found--;
2215 2216 2217 2218 2219
            else if (state == EXT_START_CODE + 2) {
                if ((buf[i] & 3) == 3)
                    pc->frame_start_found = 0;
                else
                    pc->frame_start_found = (pc->frame_start_found + 1) & 3;
2220 2221
            }
            state++;
2222
        } else {
2223
            i = avpriv_mpv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
2224
            if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
2225
                i++;
2226
                pc->frame_start_found = 4;
2227
            }
2228
            if (state == SEQ_END_CODE) {
2229
                pc->frame_start_found = 0;
2230 2231 2232
                pc->state=-1;
                return i+1;
            }
2233 2234 2235
            if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
                pc->frame_start_found = 0;
            if (pc->frame_start_found  < 4 && state == EXT_START_CODE)
2236
                pc->frame_start_found++;
2237 2238 2239 2240 2241
            if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
                if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
                    pc->frame_start_found = 0;
                    pc->state             = -1;
                    return i - 3;
2242 2243
                }
            }
2244 2245
            if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
                ff_fetch_timestamp(s, i - 3, 1);
2246
            }
2247
        }
2248
    }
2249
    pc->state = state;
2250
    return END_NOT_FOUND;
2251 2252
}

2253
static int decode_chunks(AVCodecContext *avctx,
2254 2255
                         AVFrame *picture, int *data_size,
                         const uint8_t *buf, int buf_size);
2256

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2257
/* handle buffering and image synchronisation */
2258
static int mpeg_decode_frame(AVCodecContext *avctx,
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2259
                             void *data, int *data_size,
2260
                             AVPacket *avpkt)
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2261
{
2262 2263
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
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2264
    Mpeg1Context *s = avctx->priv_data;
2265
    AVFrame *picture = data;
2266
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
2267
    av_dlog(avctx, "fill_buffer\n");
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2268

2269
    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
2270
        /* special case for last picture */
2271
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
2272
            *picture = s2->next_picture_ptr->f;
2273
            s2->next_picture_ptr = NULL;
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2274

2275 2276
            *data_size = sizeof(AVFrame);
        }
2277
        return buf_size;
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2278 2279
    }

2280 2281
    if (s2->flags & CODEC_FLAG_TRUNCATED) {
        int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL);
2282

2283
        if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0)
2284
            return buf_size;
2285 2286
    }

2287
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
2288 2289 2290
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
                                           || s2->codec_tag == AV_RL32("BW10")
                                          ))
2291
        vcr2_init_sequence(avctx);
2292

2293
    s->slice_count = 0;
2294

2295
    if (avctx->extradata && !s->parsed_extra) {
2296
        int ret = decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
2297 2298 2299 2300
        if(*data_size) {
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
            *data_size = 0;
        }
2301
        s->parsed_extra = 1;
2302
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
2303 2304
            return ret;
    }
2305

2306 2307 2308 2309
    return decode_chunks(avctx, picture, data_size, buf, buf_size);
}

static int decode_chunks(AVCodecContext *avctx,
2310 2311
                         AVFrame *picture, int *data_size,
                         const uint8_t *buf, int buf_size)
2312 2313 2314 2315 2316 2317
{
    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;
2318
    int last_code = 0;
2319

2320
    for (;;) {
2321
        /* find next start code */
2322
        uint32_t start_code = -1;
2323
        buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &start_code);
2324 2325 2326
        if (start_code > 0x1ff) {
            if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
                if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
2327
                    int i;
2328
                    av_assert0(avctx->thread_count > 1);
2329

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

2335
                if (CONFIG_VDPAU && uses_vdpau(avctx))
2336
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
2337 2338


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

2348 2349
        input_size = buf_end - buf_ptr;

2350
        if (avctx->debug & FF_DEBUG_STARTCODE) {
2351
            av_log(avctx, AV_LOG_DEBUG, "%3X at %td left %d\n", start_code, buf_ptr-buf, input_size);
2352
        }
2353

2354
        /* prepare data for next start code */
2355
        switch (start_code) {
2356
        case SEQ_START_CODE:
2357 2358
            if (last_code == 0) {
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2359 2360
                if(buf != avctx->extradata)
                    s->sync=1;
2361
            } else {
2362
                av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
2363
                if (avctx->err_recognition & AV_EF_EXPLODE)
2364
                    return AVERROR_INVALIDDATA;
2365
            }
2366
            break;
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        case PICTURE_START_CODE:
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            if(s->tmpgexs){
                s2->intra_dc_precision= 3;
                s2->intra_matrix[0]= 1;
            }
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            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
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                int i;

                avctx->execute(avctx, slice_decode_thread,
                               s2->thread_context, NULL,
                               s->slice_count, sizeof(void*));
                for (i = 0; i < s->slice_count; i++)
                    s2->error_count += s2->thread_context[i]->error_count;
                s->slice_count = 0;
            }
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            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
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                ret = mpeg_decode_postinit(avctx);
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                if (ret < 0) {
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                    av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
                    return ret;
                }
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                /* we have a complete image: we try to decompress it */
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
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                    s2->pict_type = 0;
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                s2->first_slice = 1;
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                last_code = PICTURE_START_CODE;
            } else {
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                av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
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                if (avctx->err_recognition & AV_EF_EXPLODE)
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                    return AVERROR_INVALIDDATA;
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            }
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            break;
        case EXT_START_CODE:
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            init_get_bits(&s2->gb, buf_ptr, input_size*8);

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            switch (get_bits(&s2->gb, 4)) {
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            case 0x1:
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                if (last_code == 0) {
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                mpeg_decode_sequence_extension(s);
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                } else {
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                    av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
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                    if (avctx->err_recognition & AV_EF_EXPLODE)
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                        return AVERROR_INVALIDDATA;
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                }
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                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:
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                if (last_code == PICTURE_START_CODE) {
                    mpeg_decode_picture_coding_extension(s);
                } else {
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                    av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
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                    if (avctx->err_recognition & AV_EF_EXPLODE)
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                        return AVERROR_INVALIDDATA;
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                }
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                break;
            }
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            break;
        case USER_START_CODE:
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            mpeg_decode_user_data(avctx, buf_ptr, input_size);
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            break;
        case GOP_START_CODE:
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            if (last_code == 0) {
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                s2->first_field=0;
                mpeg_decode_gop(avctx, buf_ptr, input_size);
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                s->sync=1;
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            } else {
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                av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
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                if (avctx->err_recognition & AV_EF_EXPLODE)
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                    return AVERROR_INVALIDDATA;
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            }
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            break;
        default:
            if (start_code >= SLICE_MIN_START_CODE &&
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                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
                const int field_pic = s2->picture_structure != PICT_FRAME;
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                int mb_y = start_code - SLICE_MIN_START_CODE;
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                last_code = SLICE_MIN_START_CODE;
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                if(s2->codec_id != CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
                    mb_y += (*buf_ptr&0xE0)<<2;
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                mb_y <<= field_pic;
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                if (s2->picture_structure == PICT_BOTTOM_FIELD)
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                    mb_y++;

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                if (mb_y >= s2->mb_height) {
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                    av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height);
                    return -1;
                }

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                if (s2->last_picture_ptr == NULL) {
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                /* Skip B-frames if we do not have reference frames and gop is not closed */
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                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
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                        if (!s2->closed_gop)
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                            break;
                    }
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                }
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                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
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                    s->sync=1;
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                if (s2->next_picture_ptr == NULL) {
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                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
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                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
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                }
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                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)
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                    break;
2483

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                if (!s->mpeg_enc_ctx_allocated)
                    break;
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                if (s2->codec_id == CODEC_ID_MPEG2VIDEO) {
                    if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
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                        break;
                }
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                if (!s2->pict_type) {
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                    av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
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                    if (avctx->err_recognition & AV_EF_EXPLODE)
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                        return AVERROR_INVALIDDATA;
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                    break;
                }

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                if (s2->first_slice) {
                    s2->first_slice = 0;
                    if (mpeg_field_start(s2, buf, buf_size) < 0)
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                        return -1;
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                }
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                if (!s2->current_picture_ptr) {
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                    av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n");
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                    return AVERROR_INVALIDDATA;
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                }
2508

2509
                if (uses_vdpau(avctx)) {
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                    s->slice_count++;
                    break;
                }

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                if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
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                    int threshold = (s2->mb_height * s->slice_count +
                                     s2->slice_context_count / 2) /
                                    s2->slice_context_count;
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                    av_assert0(avctx->thread_count > 1);
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                    if (threshold <= mb_y) {
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];
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                        thread_context->start_mb_y = mb_y;
                        thread_context->end_mb_y   = s2->mb_height;
                        if (s->slice_count) {
                            s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
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                            ff_update_duplicate_context(thread_context, s2);
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                        }
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                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
                        s->slice_count++;
                    }
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                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
                } else {
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                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
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                    emms_c();

2536
                    if (ret < 0) {
2537
                        if (avctx->err_recognition & AV_EF_EXPLODE)
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                            return ret;
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                        if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
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                            ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
2541
                    } else {
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                        ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END);
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                    }
                }
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            }
            break;
        }
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    }
}

2551 2552
static void flush(AVCodecContext *avctx)
{
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    Mpeg1Context *s = avctx->priv_data;

    s->sync=0;

    ff_mpeg_flush(avctx);
}

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static int mpeg_decode_end(AVCodecContext *avctx)
{
    Mpeg1Context *s = avctx->priv_data;

    if (s->mpeg_enc_ctx_allocated)
2565
        ff_MPV_common_end(&s->mpeg_enc_ctx);
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    return 0;
}

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


2582
AVCodec ff_mpeg1video_decoder = {
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    .name                  = "mpeg1video",
    .type                  = AVMEDIA_TYPE_VIDEO,
    .id                    = CODEC_ID_MPEG1VIDEO,
    .priv_data_size        = sizeof(Mpeg1Context),
    .init                  = mpeg_decode_init,
    .close                 = mpeg_decode_end,
    .decode                = mpeg_decode_frame,
    .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                             CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                             CODEC_CAP_SLICE_THREADS,
    .flush                 = flush,
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    .max_lowres            = 3,
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    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
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    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
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};

2599
AVCodec ff_mpeg2video_decoder = {
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    .name           = "mpeg2video",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
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    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                      CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                      CODEC_CAP_SLICE_THREADS,
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    .flush          = flush,
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    .max_lowres     = 3,
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    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
    .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
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};

//legacy decoder
2617
AVCodec ff_mpegvideo_decoder = {
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    .name           = "mpegvideo",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
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    .flush          = flush,
    .max_lowres     = 3,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
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};
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2630

2631
#if CONFIG_MPEG_XVMC_DECODER
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static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
{
    if (avctx->active_thread_type & FF_THREAD_SLICE)
2635
        return -1;
2636
    if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
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        return -1;
2638
    if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
2639
        av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
2640
    }
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    mpeg_decode_init(avctx);

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    avctx->pix_fmt           = PIX_FMT_XVMC_MPEG2_IDCT;
    avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
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    return 0;
}

2649
AVCodec ff_mpeg_xvmc_decoder = {
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    .name           = "mpegvideo_xvmc",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_MPEG2VIDEO_XVMC,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_mc_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
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    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                      CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
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    .flush          = flush,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
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};

#endif
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#if CONFIG_MPEG_VDPAU_DECODER
2666
AVCodec ff_mpeg_vdpau_decoder = {
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    .name           = "mpegvideo_vdpau",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
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    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
                      CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
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    .flush          = flush,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
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};
#endif

2681
#if CONFIG_MPEG1_VDPAU_DECODER
2682
AVCodec ff_mpeg1_vdpau_decoder = {
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    .name           = "mpeg1video_vdpau",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_MPEG1VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
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    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
                      CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
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    .flush          = flush,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
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};
#endif