mpeg12dec.c 95 KB
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/*
 * MPEG-1/2 decoder
 * Copyright (c) 2000, 2001 Fabrice Bellard
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 * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * 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
 * version 2.1 of the License, or (at your option) any later version.
 *
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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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
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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
 */

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

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#include "libavutil/attributes.h"
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#include "libavutil/internal.h"
#include "internal.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "error_resilience.h"
#include "mpeg12.h"
#include "mpeg12data.h"
#include "mpeg12decdata.h"
#include "bytestream.h"
#include "vdpau_internal.h"
#include "xvmc_internal.h"
#include "thread.h"

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typedef struct Mpeg1Context {
    MpegEncContext mpeg_enc_ctx;
    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
    int repeat_field; /* true if we must repeat the field */
    AVPanScan pan_scan;              /**< some temporary storage for the panscan */
    int slice_count;
    int swap_uv;//indicate VCR2
    int save_aspect_info;
    int save_width, save_height, save_progressive_seq;
    AVRational frame_rate_ext;       ///< MPEG-2 specific framerate modificator
    int sync;                        ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
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    int tmpgexs;
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    int extradata_decoded;
} Mpeg1Context;

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

    code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
    if (code == 0) {
        return pred;
    }
    if (code < 0) {
        return 0xffff;
    }

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

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

static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
{
    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;

    /* 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);

            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);
            } 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; 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;
                }
            }
            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;
            }

            block[j] = level;
        }
        CLOSE_READER(re, &s->gb);
    }
    s->block_last_index[n] = i;
   return 0;
}

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

static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *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 = s->inter_matrix;
    const int qscale             = s->qscale;

    {
        OPEN_READER(re, &s->gb);
        i = -1;
        // special case for first coefficient, no need to add second VLC table
        UPDATE_CACHE(re, &s->gb);
        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);

            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;
            }

            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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/**
 * Note: this function can read out of range and crash for corrupt streams.
 * Changing this would eat up any speed benefits it has.
 * Do not use "fast" flag if you need the code to be robust.
 */
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static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *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;
        // 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;
        }

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

            if (level != 0) {
                i += run;
                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;
                }
            }

            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_non_intra(MpegEncContext *s, int16_t *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;

    mismatch = 1;

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

        // 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;
        }

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

            if (level != 0) {
                i += run;
                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);
                return -1;
            }

            mismatch ^= level;
            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);
    }
    block[63] ^= (mismatch & 1);

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

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/**
 * Note: this function can read out of range and crash for corrupt streams.
 * Changing this would eat up any speed benefits it has.
 * Do not use "fast" flag if you need the code to be robust.
 */
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static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
                                                    int16_t *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;

    // 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;
    }

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

        if (level != 0) {
            i += run;
            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);

            i += run;
            j  = scantable[i];
            if (level < 0) {
                level = ((-level * 2 + 1) * qscale) >> 1;
                level = -level;
            } else {
                level = ((level * 2 + 1) * qscale) >> 1;
            }
        }

        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, int16_t *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);
            } 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 * qscale * quant_matrix[j]) >> 4;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
                }
            }
            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;
            }

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

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

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/**
 * Note: this function can read out of range and crash for corrupt streams.
 * Changing this would eat up any speed benefits it has.
 * Do not use "fast" flag if you need the code to be robust.
 */
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static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *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;
    } 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);
    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) {
                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);
            } 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);
                scantable += run;
                j = *scantable;
                if (level < 0) {
                    level = (-level * qscale * quant_matrix[j]) >> 4;
                    level = -level;
                } else {
                    level = (level * qscale * quant_matrix[j]) >> 4;
                }
            }

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

    s->block_last_index[n] = scantable - s->intra_scantable.permutated;
    return 0;
}

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

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

static inline int get_qscale(MpegEncContext *s)
{
    int qscale = get_bits(&s->gb, 5);
    if (s->q_scale_type) {
        return non_linear_qscale[qscale];
    } else {
        return qscale << 1;
    }
}

static void exchange_uv(MpegEncContext *s)
{
    int16_t (*tmp)[64];

    tmp           = s->pblocks[4];
    s->pblocks[4] = s->pblocks[5];
    s->pblocks[5] = tmp;
}

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

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

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

655
    av_assert2(s->mb_skipped == 0);
656 657 658 659 660 661 662 663 664 665 666 667

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

            if (s->mb_x)
                mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
            else
                mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
668 669
            if (IS_INTRA(mb_type)) {
                av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
670
                return -1;
671
            }
672 673
            s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
                mb_type | MB_TYPE_SKIP;
674

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//            assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));

            if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
                s->mb_skipped = 1;
        }

        return 0;
    }

    switch (s->pict_type) {
    default:
    case AV_PICTURE_TYPE_I:
        if (get_bits1(&s->gb) == 0) {
            if (get_bits1(&s->gb) == 0) {
                av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
                return -1;
            }
            mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
        } else {
            mb_type = MB_TYPE_INTRA;
        }
        break;
    case AV_PICTURE_TYPE_P:
        mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
        if (mb_type < 0) {
            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, ff_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;
    }
    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]);

        if (!s->chroma_y_shift) {
            s->dsp.clear_blocks(s->block[6]);
        }

        /* 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);
        }

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

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

            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]);

            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);
            }
        }

        if (s->codec_id == AV_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);
                }
            } else {
                for (i = 0; i < mb_block_count; i++) {
                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
                        return -1;
                }
            }
        } else {
            for (i = 0; i < 6; i++) {
                if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
                    return -1;
            }
        }
    } else {
        if (mb_type & MB_TYPE_ZERO_MV) {
773
            av_assert2(mb_type & MB_TYPE_CBP);
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            s->mv_dir = MV_DIR_FORWARD;
            if (s->picture_structure == PICT_FRAME) {
777 778
                if (s->picture_structure == PICT_FRAME
                    && !s->frame_pred_frame_dct)
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                    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;
            }

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

            s->last_mv[0][0][0] = 0;
            s->last_mv[0][0][1] = 0;
            s->last_mv[0][1][0] = 0;
            s->last_mv[0][1][1] = 0;
            s->mv[0][0][0] = 0;
            s->mv[0][0][1] = 0;
        } else {
797
            av_assert2(mb_type & MB_TYPE_L0L1);
798 799
            // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
            /* get additional motion vector type */
800
            if (s->picture_structure == PICT_FRAME && s->frame_pred_frame_dct)
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
                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);
            }

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

            /* motion vectors */
            s->mv_dir = (mb_type >> 13) & 3;
            av_dlog(s->avctx, "motion_type=%d\n", motion_type);
            switch (motion_type) {
            case MT_FRAME: /* or MT_16X8 */
                if (s->picture_structure == PICT_FRAME) {
                    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 */
                            if (s->full_pel[i]) {
                                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 {
874
                    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;

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


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

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

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

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

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

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

        s->mb_intra = 0;
        if (HAS_CBP(mb_type)) {
            s->dsp.clear_blocks(s->block[0]);

            cbp = get_vlc2(&s->gb, ff_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) {
961
                av_log(s->avctx, AV_LOG_ERROR, "invalid cbp %d at %d %d\n", cbp, s->mb_x, s->mb_y);
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
                return -1;
            }

            //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);
                }
            }

            if (s->codec_id == AV_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;

                    for (i = 0; i < mb_block_count; i++) {
                        if (cbp & (1 << 11)) {
                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
                                return -1;
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                }
            } else {
                if (s->flags2 & CODEC_FLAG2_FAST) {
                    for (i = 0; i < 6; i++) {
                        if (cbp & 32) {
                            mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                } else {
                    for (i = 0; i < 6; i++) {
                        if (cbp & 32) {
                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
                                return -1;
                        } else {
                            s->block_last_index[i] = -1;
                        }
                        cbp += cbp;
                    }
                }
            }
        } else {
            for (i = 0; i < 12; i++)
                s->block_last_index[i] = -1;
        }
    }

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

    return 0;
}

static av_cold int mpeg_decode_init(AVCodecContext *avctx)
{
    Mpeg1Context *s = avctx->priv_data;
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
    int i;

    /* we need some permutation to store matrices,
     * until MPV_common_init() sets the real permutation. */
    for (i = 0; i < 64; i++)
       s2->dsp.idct_permutation[i]=i;

    ff_MPV_decode_defaults(s2);

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

    s->mpeg_enc_ctx_allocated      = 0;
    s->mpeg_enc_ctx.picture_number = 0;
    s->repeat_field                = 0;
    s->mpeg_enc_ctx.codec_id       = avctx->codec->id;
    avctx->color_range = AVCOL_RANGE_MPEG;
    if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
    else
        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
    return 0;
}

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;

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

    err = ff_mpeg_update_thread_context(avctx, avctx_from);
    if (err) return err;

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

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

    return 0;
}

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

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

    for (i = 0; i < 64; i++) {
        matrix[new_perm[i]] = temp_matrix[old_perm[i]];
    }
}

1094 1095
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
#if CONFIG_MPEG_XVMC_DECODER
1096 1097
    AV_PIX_FMT_XVMC_MPEG2_IDCT,
    AV_PIX_FMT_XVMC_MPEG2_MC,
1098 1099 1100
#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL
    AV_PIX_FMT_VDPAU_MPEG1,
1101
    AV_PIX_FMT_VDPAU,
1102 1103 1104 1105
#endif
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_NONE
};
1106

1107 1108 1109 1110 1111 1112 1113
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
#if CONFIG_MPEG_XVMC_DECODER
    AV_PIX_FMT_XVMC_MPEG2_IDCT,
    AV_PIX_FMT_XVMC_MPEG2_MC,
#endif
#if CONFIG_MPEG2_VDPAU_HWACCEL
    AV_PIX_FMT_VDPAU_MPEG2,
1114
    AV_PIX_FMT_VDPAU,
1115
#endif
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
#if CONFIG_MPEG2_DXVA2_HWACCEL
    AV_PIX_FMT_DXVA2_VLD,
#endif
#if CONFIG_MPEG2_VAAPI_HWACCEL
    AV_PIX_FMT_VAAPI_VLD,
#endif
    AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_NONE
};

1126 1127 1128 1129
static inline int uses_vdpau(AVCodecContext *avctx) {
    return avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG1 || avctx->pix_fmt == AV_PIX_FMT_VDPAU_MPEG2;
}

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

1135
    if(s->chroma_format < 2) {
1136
        return ff_thread_get_format(avctx,
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
                                avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
                                mpeg1_hwaccel_pixfmt_list_420 :
                                mpeg2_hwaccel_pixfmt_list_420);
    } else if(s->chroma_format == 2)
        return AV_PIX_FMT_YUV422P;
    else
        return AV_PIX_FMT_YUV444P;
}

static void setup_hwaccel_for_pixfmt(AVCodecContext *avctx)
{
    if (avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_IDCT && avctx->pix_fmt != AV_PIX_FMT_XVMC_MPEG2_MC) {
        avctx->xvmc_acceleration = 0;
    } else if (!avctx->xvmc_acceleration) {
        avctx->xvmc_acceleration = 2;
1152
    }
1153 1154 1155 1156 1157 1158
    avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
    // until then pix_fmt may be changed right after codec init
    if (avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
        avctx->hwaccel || uses_vdpau(avctx))
        if (avctx->idct_algo == FF_IDCT_AUTO)
            avctx->idct_algo = FF_IDCT_SIMPLE;
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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. */
static int mpeg_decode_postinit(AVCodecContext *avctx)
{
    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    uint8_t old_permutation[64];

    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    ||
        s1->save_progressive_seq != s->progressive_sequence ||
        0)
    {

        if (s1->mpeg_enc_ctx_allocated) {
            ParseContext pc = s->parse_context;
            s->parse_context.buffer = 0;
            ff_MPV_common_end(s);
            s->parse_context = pc;
        }

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

        avcodec_set_dimensions(avctx, s->width, s->height);
1190 1191 1192 1193 1194 1195
        if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate) {
            avctx->rc_max_rate = s->bit_rate;
        } else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
                   (s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
            avctx->bit_rate = s->bit_rate;
        }
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        s1->save_aspect_info     = s->aspect_ratio_info;
        s1->save_width           = s->width;
        s1->save_height          = s->height;
        s1->save_progressive_seq = s->progressive_sequence;

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

        if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
            //MPEG-1 fps
            avctx->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
            avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
            //MPEG-1 aspect
            avctx->sample_aspect_ratio = av_d2q(1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
            avctx->ticks_per_frame=1;
        } else {//MPEG-2
        //MPEG-2 fps
            av_reduce(&s->avctx->time_base.den,
                      &s->avctx->time_base.num,
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
                      ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
                      1 << 30);
            avctx->ticks_per_frame = 2;
            //MPEG-2 aspect
            if (s->aspect_ratio_info > 1) {
                AVRational dar =
                    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});

                // we ignore the spec here and guess a bit as reality does not match the spec, see for example
                // res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
                // issue1613, 621, 562
                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});
//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
//                    s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
                    av_dlog(avctx, "A %d/%d\n",
                            ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
                    av_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
                            s->avctx->sample_aspect_ratio.den);
                }
            } else {
                s->avctx->sample_aspect_ratio =
                    ff_mpeg2_aspect[s->aspect_ratio_info];
            }
        } // MPEG-2

        avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1255
        setup_hwaccel_for_pixfmt(avctx);
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        /* Quantization matrices may need reordering
         * if DCT permutation is changed. */
        memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));

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

        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);

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

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

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

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

    vbv_delay = get_bits(&s->gb, 16);
1289
    s->vbv_delay = vbv_delay;
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    if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
        s->full_pel[0] = get_bits1(&s->gb);
        f_code = get_bits(&s->gb, 3);
1293
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1294
            return -1;
1295
        f_code += !f_code;
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        s->mpeg_f_code[0][0] = f_code;
        s->mpeg_f_code[0][1] = f_code;
    }
    if (s->pict_type == AV_PICTURE_TYPE_B) {
        s->full_pel[1] = get_bits1(&s->gb);
        f_code = get_bits(&s->gb, 3);
1302
        if (f_code == 0 && (avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)))
1303
            return -1;
1304
        f_code += !f_code;
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        s->mpeg_f_code[1][0] = f_code;
        s->mpeg_f_code[1][1] = f_code;
    }
    s->current_picture.f.pict_type = s->pict_type;
    s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;

    if (avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);

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

static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
{
    MpegEncContext *s= &s1->mpeg_enc_ctx;
    int horiz_size_ext, vert_size_ext;
    int bit_rate_ext;

    skip_bits(&s->gb, 1); /* profile and level esc*/
    s->avctx->profile       = get_bits(&s->gb, 3);
    s->avctx->level         = get_bits(&s->gb, 4);
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
    s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
    horiz_size_ext          = get_bits(&s->gb, 2);
    vert_size_ext           = get_bits(&s->gb, 2);
    s->width  |= (horiz_size_ext << 12);
    s->height |= (vert_size_ext  << 12);
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
    s->bit_rate += (bit_rate_ext << 18) * 400;
    skip_bits1(&s->gb); /* marker */
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;

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

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

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

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

}

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

    skip_bits(&s->gb, 3); /* video format */
    color_description = get_bits1(&s->gb);
    if (color_description) {
        s->avctx->color_primaries = get_bits(&s->gb, 8);
        s->avctx->color_trc       = get_bits(&s->gb, 8);
        s->avctx->colorspace      = get_bits(&s->gb, 8);
    }
    w = get_bits(&s->gb, 14);
    skip_bits(&s->gb, 1); //marker
    h = get_bits(&s->gb, 14);
    // remaining 3 bits are zero padding

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

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

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

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

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

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

    for (i = 0; i < 64; i++) {
        int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
        int v = get_bits(&s->gb, 8);
        if (v == 0) {
            av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
            return -1;
        }
        if (intra && i == 0 && v != 8) {
1424
            av_log(s->avctx, AV_LOG_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
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            v = 8; // needed by pink.mpg / issue1046
        }
        matrix0[j] = v;
        if (matrix1)
            matrix1[j] = v;
    }
    return 0;
}

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

    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);
}

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

    s->full_pel[0] = s->full_pel[1] = 0;
    s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
    s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
    s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
    s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
    if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
        av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
        if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
            if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
                s->pict_type = AV_PICTURE_TYPE_I;
            else
                s->pict_type = AV_PICTURE_TYPE_P;
        } else
            s->pict_type = AV_PICTURE_TYPE_B;
        s->current_picture.f.pict_type = s->pict_type;
        s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
    }
1465 1466 1467 1468 1469
    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);
    s->concealment_motion_vectors = get_bits1(&s->gb);
    s->q_scale_type               = get_bits1(&s->gb);
    s->intra_vlc_format           = get_bits1(&s->gb);
    s->alternate_scan             = get_bits1(&s->gb);
    s->repeat_first_field         = get_bits1(&s->gb);
    s->chroma_420_type            = get_bits1(&s->gb);
    s->progressive_frame          = get_bits1(&s->gb);


    if (s->alternate_scan) {
        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);
    }

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

static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
{
    AVCodecContext *avctx = s->avctx;
    Mpeg1Context *s1 = (Mpeg1Context*)s;

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

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

        ff_mpeg_er_frame_start(s);

        /* first check if we must repeat the frame */
        s->current_picture_ptr->f.repeat_pict = 0;
        if (s->repeat_first_field) {
            if (s->progressive_sequence) {
                if (s->top_field_first)
                    s->current_picture_ptr->f.repeat_pict = 4;
                else
                    s->current_picture_ptr->f.repeat_pict = 2;
            } else if (s->progressive_frame) {
                s->current_picture_ptr->f.repeat_pict = 1;
            }
        }

        pan_scan = av_frame_new_side_data(&s->current_picture_ptr->f,
                                          AV_FRAME_DATA_PANSCAN,
                                          sizeof(s1->pan_scan));
        if (!pan_scan)
            return AVERROR(ENOMEM);
        memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));

        if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
            ff_thread_finish_setup(avctx);
    } else { // second field
        int i;

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

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

        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];
            }
        }
    }

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

// MPV_frame_start will call this function too,
// but we need to call it on every field
    if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
        if (ff_xvmc_field_start(s, avctx) < 0)
            return -1;

    return 0;
}

#define DECODE_SLICE_ERROR -1
#define DECODE_SLICE_OK     0

/**
 * Decode a slice.
 * MpegEncContext.mb_y must be set to the MB row from the startcode.
 * @return DECODE_SLICE_ERROR if the slice is damaged,
 *         DECODE_SLICE_OK if this slice is OK
 */
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
                             const uint8_t **buf, int buf_size)
{
    AVCodecContext *avctx = s->avctx;
1588
    const int lowres      = s->avctx->lowres;
1589 1590 1591 1592 1593
    const int field_pic   = s->picture_structure != PICT_FRAME;

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

1594
    av_assert0(mb_y < s->mb_height);
1595 1596

    init_get_bits(&s->gb, *buf, buf_size * 8);
1597 1598
    if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
        skip_bits(&s->gb, 3);
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704

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

    s->qscale = get_qscale(s);

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

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

    s->mb_x = 0;

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

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

    if (avctx->hwaccel) {
        const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
        int start_code = -1;
        buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
        if (buf_end < *buf + buf_size)
            buf_end -= 4;
        s->mb_y = mb_y;
        if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
            return DECODE_SLICE_ERROR;
        *buf = buf_end;
        return DECODE_SLICE_OK;
    }

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

    if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
             av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
                    s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
                    s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
                    s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
                    s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
                    s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
        }
    }

    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

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

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

            for (i = 0; i < 2; i++) {
                for (dir = 0; dir < 2; dir++) {
                    if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
                        motion_x = motion_y = 0;
                    } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) {
                        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];
                    }

                    s->current_picture.motion_val[dir][xy    ][0] = motion_x;
                    s->current_picture.motion_val[dir][xy    ][1] = motion_y;
                    s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
                    s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
                    s->current_picture.ref_index [dir][b8_xy    ] =
                    s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
1705
                    av_assert2(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1);
1706 1707 1708 1709 1710 1711
                }
                xy += wrap;
                b8_xy +=2;
            }
        }

1712 1713 1714
        s->dest[0] += 16 >> lowres;
        s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
        s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1715 1716 1717 1718

        ff_MPV_decode_mb(s, s->block);

        if (++s->mb_x >= s->mb_width) {
1719
            const int mb_size = 16 >> s->avctx->lowres;
1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732

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

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

            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*/;

1733 1734 1735 1736 1737 1738 1739 1740 1741
                if (left >= 32 && !is_d10) {
                    GetBitContext gb = s->gb;
                    align_get_bits(&gb);
                    if (show_bits(&gb, 24) == 0x060E2B) {
                        av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
                        is_d10 = 1;
                    }
                }

1742
                if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1743
                    || ((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
                    av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
                    return -1;
                } else
                    goto eos;
            }

            ff_init_block_index(s);
        }

        /* skip mb handling */
        if (s->mb_skip_run == -1) {
            /* read increment again */
            s->mb_skip_run = 0;
            for (;;) {
                int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
                                    MBINCR_VLC_BITS, 2);
                if (code < 0) {
                    av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
                    return -1;
                }
                if (code >= 33) {
                    if (code == 33) {
                        s->mb_skip_run += 33;
                    } else if (code == 35) {
                        if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
                            av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
                            return -1;
                        }
                        goto eos; /* end of slice */
                    }
                    /* otherwise, stuffing, nothing to do */
                } else {
                    s->mb_skip_run += code;
                    break;
                }
            }
            if (s->mb_skip_run) {
                int i;
                if (s->pict_type == AV_PICTURE_TYPE_I) {
                    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;
                for (i = 0; i < 12; i++)
                    s->block_last_index[i] = -1;
                if (s->picture_structure == PICT_FRAME)
                    s->mv_type = MV_TYPE_16X16;
                else
                    s->mv_type = MV_TYPE_FIELD;
                if (s->pict_type == AV_PICTURE_TYPE_P) {
                    /* if P type, zero motion vector is implied */
                    s->mv_dir             = MV_DIR_FORWARD;
                    s->mv[0][0][0]        = s->mv[0][0][1]      = 0;
                    s->last_mv[0][0][0]   = s->last_mv[0][0][1] = 0;
                    s->last_mv[0][1][0]   = s->last_mv[0][1][1] = 0;
                    s->field_select[0][0] = (s->picture_structure - 1) & 1;
                } else {
                    /* if B type, reuse previous vectors and directions */
                    s->mv[0][0][0] = s->last_mv[0][0][0];
                    s->mv[0][0][1] = s->last_mv[0][0][1];
                    s->mv[1][0][0] = s->last_mv[1][0][0];
                    s->mv[1][0][1] = s->last_mv[1][0][1];
                }
            }
        }
    }
eos: // end of slice
    *buf += (get_bits_count(&s->gb)-1)/8;
    av_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
    return 0;
}

static int slice_decode_thread(AVCodecContext *c, void *arg)
{
    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;

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

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

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

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

        start_code = -1;
        buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
1850 1851 1852 1853
        mb_y= start_code - SLICE_MIN_START_CODE;
        if(s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
            mb_y += (*buf&0xE0)<<2;
        mb_y <<= field_pic;
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
        if (s->picture_structure == PICT_BOTTOM_FIELD)
            mb_y++;
        if (mb_y < 0 || mb_y >= s->end_mb_y)
            return -1;
    }
}

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

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

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

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

    /* end of slice reached */
1882
    if (/*s->mb_y << field_pic == s->mb_height &&*/ !s->first_field && !s->first_slice) {
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892
        /* end of image */

        ff_er_frame_end(&s->er);

        ff_MPV_frame_end(s);

        if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
            int ret = av_frame_ref(pict, &s->current_picture_ptr->f);
            if (ret < 0)
                return ret;
1893 1894
            ff_print_debug_info(s, s->current_picture_ptr, pict);
            ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1895 1896 1897 1898 1899 1900 1901 1902 1903
        } else {
            if (avctx->active_thread_type & FF_THREAD_FRAME)
                s->picture_number++;
            /* latency of 1 frame for I- and P-frames */
            /* XXX: use another variable than picture_number */
            if (s->last_picture_ptr != NULL) {
                int ret = av_frame_ref(pict, &s->last_picture_ptr->f);
                if (ret < 0)
                    return ret;
1904 1905
                ff_print_debug_info(s, s->last_picture_ptr, pict);
                ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG2);
1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
            }
        }

        return 1;
    } else {
        return 0;
    }
}

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

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

    width  = get_bits(&s->gb, 12);
    height = get_bits(&s->gb, 12);
    if (width == 0 || height == 0) {
        av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size "
               "value.\n");
1930
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
1931 1932 1933 1934 1935
            return AVERROR_INVALIDDATA;
    }
    s->aspect_ratio_info = get_bits(&s->gb, 4);
    if (s->aspect_ratio_info == 0) {
        av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1936
        if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
            return -1;
    }
    s->frame_rate_index = get_bits(&s->gb, 4);
    if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
        return -1;
    s->bit_rate = get_bits(&s->gb, 18) * 400;
    if (get_bits1(&s->gb) == 0) /* marker */
        return -1;
    s->width  = width;
    s->height = height;

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

    /* get matrix */
    if (get_bits1(&s->gb)) {
        load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
    } else {
        for (i = 0; i < 64; i++) {
            j = s->dsp.idct_permutation[i];
            v = ff_mpeg1_default_intra_matrix[i];
            s->intra_matrix[j]        = v;
            s->chroma_intra_matrix[j] = v;
        }
    }
    if (get_bits1(&s->gb)) {
        load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
    } else {
        for (i = 0; i < 64; i++) {
            int j = s->dsp.idct_permutation[i];
            v = ff_mpeg1_default_non_intra_matrix[i];
            s->inter_matrix[j]        = v;
            s->chroma_inter_matrix[j] = v;
        }
    }

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

    /* we set MPEG-2 parameters so that it emulates MPEG-1 */
    s->progressive_sequence = 1;
    s->progressive_frame    = 1;
    s->picture_structure    = PICT_FRAME;
1982
    s->first_field          = 0;
1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
    s->frame_pred_frame_dct = 1;
    s->chroma_format        = 1;
    s->codec_id             = s->avctx->codec_id = AV_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)
        av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
               s->avctx->rc_buffer_size, s->bit_rate);

    return 0;
}

static int vcr2_init_sequence(AVCodecContext *avctx)
{
    Mpeg1Context *s1 = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int i, v;

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

    avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2015
    setup_hwaccel_for_pixfmt(avctx);
2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034

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

    for (i = 0; i < 64; i++) {
        int j = s->dsp.idct_permutation[i];
        v = ff_mpeg1_default_intra_matrix[i];
        s->intra_matrix[j]        = v;
        s->chroma_intra_matrix[j] = v;

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

    s->progressive_sequence  = 1;
    s->progressive_frame     = 1;
    s->picture_structure     = PICT_FRAME;
2035
    s->first_field           = 0;
2036 2037
    s->frame_pred_frame_dct  = 1;
    s->chroma_format         = 1;
2038 2039 2040 2041 2042 2043 2044
    if (s->codec_tag == AV_RL32("BW10")) {
        s->codec_id              = s->avctx->codec_id = AV_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 = AV_CODEC_ID_MPEG2VIDEO;
    }
2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
    s1->save_width           = s->width;
    s1->save_height          = s->height;
    s1->save_progressive_seq = s->progressive_sequence;
    return 0;
}


static void mpeg_decode_user_data(AVCodecContext *avctx,
                                  const uint8_t *p, int buf_size)
{
2055
    Mpeg1Context *s = avctx->priv_data;
2056 2057
    const uint8_t *buf_end = p + buf_size;

2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
    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(avctx, AV_LOG_ERROR, "%c", p[i]);
        }
            av_log(avctx, AV_LOG_ERROR, "\n");*/
    }

2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093
    /* we parse the DTG active format information */
    if (buf_end - p >= 5 &&
        p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
        int flags = p[4];
        p += 5;
        if (flags & 0x80) {
            /* skip event id */
            p += 2;
        }
        if (flags & 0x40) {
            if (buf_end - p < 1)
                return;
            avctx->dtg_active_format = p[0] & 0x0f;
        }
    }
}

static void mpeg_decode_gop(AVCodecContext *avctx,
                            const uint8_t *buf, int buf_size)
{
    Mpeg1Context *s1  = avctx->priv_data;
    MpegEncContext *s = &s1->mpeg_enc_ctx;
    int broken_link;
2094
    int64_t tc;
2095 2096 2097

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

2098
    tc = avctx->timecode_frame_start = get_bits(&s->gb, 25);
2099

2100
    s->closed_gop = get_bits1(&s->gb);
2101 2102 2103 2104 2105
    /*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);

2106 2107 2108 2109 2110 2111 2112
    if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
        char tcbuf[AV_TIMECODE_STR_SIZE];
        av_timecode_make_mpeg_tc_string(tcbuf, tc);
        av_log(s->avctx, AV_LOG_DEBUG,
               "GOP (%s) closed_gop=%d broken_link=%d\n",
               tcbuf, s->closed_gop, broken_link);
    }
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
}

static int decode_chunks(AVCodecContext *avctx,
                         AVFrame *picture, int *got_output,
                         const uint8_t *buf, int buf_size)
{
    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;
    int last_code = 0;
2125
    int picture_start_code_seen = 0;
2126 2127 2128 2129 2130 2131 2132 2133 2134

    for (;;) {
        /* find next start code */
        uint32_t start_code = -1;
        buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
        if (start_code > 0x1ff) {
            if (s2->pict_type != AV_PICTURE_TYPE_B || avctx->skip_frame <= AVDISCARD_DEFAULT) {
                if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
                    int i;
2135
                    av_assert0(avctx->thread_count > 1);
2136 2137 2138 2139 2140 2141 2142

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

                if ((CONFIG_MPEG_VDPAU_DECODER || CONFIG_MPEG1_VDPAU_DECODER)
2143
                    && uses_vdpau(avctx))
2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168
                    ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);

                ret = slice_end(avctx, picture);
                if (ret < 0)
                    return ret;
                else if (ret) {
                    if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
                        *got_output = 1;
                }
            }
            s2->pict_type = 0;
            return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
        }

        input_size = buf_end - buf_ptr;

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

        /* prepare data for next start code */
        switch (start_code) {
        case SEQ_START_CODE:
            if (last_code == 0) {
                mpeg1_decode_sequence(avctx, buf_ptr, input_size);
2169 2170
                if(buf != avctx->extradata)
                    s->sync=1;
2171 2172 2173 2174 2175 2176 2177 2178
            } else {
                av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code);
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;

        case PICTURE_START_CODE:
2179 2180 2181 2182 2183 2184 2185 2186
            if (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
               /* If it's a frame picture, there can't be more than one picture header.
                  Yet, it does happen and we need to handle it. */
               av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
               break;
            }
            picture_start_code_seen = 1;

2187 2188 2189 2190 2191 2192
            if (s2->width <= 0 || s2->height <= 0) {
                av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
                       s2->width, s2->height);
                return AVERROR_INVALIDDATA;
            }

2193 2194 2195 2196
            if(s->tmpgexs){
                s2->intra_dc_precision= 3;
                s2->intra_matrix[0]= 1;
            }
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272
            if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
                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->er.error_count += s2->thread_context[i]->er.error_count;
                s->slice_count = 0;
            }
            if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
                ret = mpeg_decode_postinit(avctx);
                if (ret < 0) {
                    av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
                    return ret;
                }

                /* we have a complete image: we try to decompress it */
                if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
                    s2->pict_type = 0;
                s2->first_slice = 1;
                last_code = PICTURE_START_CODE;
            } else {
                av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code);
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;
        case EXT_START_CODE:
            init_get_bits(&s2->gb, buf_ptr, input_size*8);

            switch (get_bits(&s2->gb, 4)) {
            case 0x1:
                if (last_code == 0) {
                mpeg_decode_sequence_extension(s);
                } else {
                    av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code);
                    if (avctx->err_recognition & AV_EF_EXPLODE)
                        return AVERROR_INVALIDDATA;
                }
                break;
            case 0x2:
                mpeg_decode_sequence_display_extension(s);
                break;
            case 0x3:
                mpeg_decode_quant_matrix_extension(s2);
                break;
            case 0x7:
                mpeg_decode_picture_display_extension(s);
                break;
            case 0x8:
                if (last_code == PICTURE_START_CODE) {
                    mpeg_decode_picture_coding_extension(s);
                } else {
                    av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code);
                    if (avctx->err_recognition & AV_EF_EXPLODE)
                        return AVERROR_INVALIDDATA;
                }
                break;
            }
            break;
        case USER_START_CODE:
            mpeg_decode_user_data(avctx, buf_ptr, input_size);
            break;
        case GOP_START_CODE:
            if (last_code == 0) {
                s2->first_field=0;
                mpeg_decode_gop(avctx, buf_ptr, input_size);
                s->sync=1;
            } else {
                av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code);
                if (avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }
            break;
        default:
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298
            if (start_code >= SLICE_MIN_START_CODE &&
                start_code <= SLICE_MAX_START_CODE && last_code == PICTURE_START_CODE) {

                if (s2->progressive_sequence && !s2->progressive_frame) {
                    s2->progressive_frame = 1;
                    av_log(s2->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
                }

                if (s2->picture_structure == 0 || (s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
                    av_log(s2->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s2->picture_structure);
                    s2->picture_structure = PICT_FRAME;
                }

                if (s2->progressive_sequence && !s2->frame_pred_frame_dct) {
                    av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
                }

                if (s2->picture_structure == PICT_FRAME) {
                    s2->first_field = 0;
                    s2->v_edge_pos  = 16 * s2->mb_height;
                } else {
                    s2->first_field ^= 1;
                    s2->v_edge_pos   = 8 * s2->mb_height;
                    memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
                }
            }
2299 2300 2301
            if (start_code >= SLICE_MIN_START_CODE &&
                start_code <= SLICE_MAX_START_CODE && last_code != 0) {
                const int field_pic = s2->picture_structure != PICT_FRAME;
2302
                int mb_y = start_code - SLICE_MIN_START_CODE;
2303
                last_code = SLICE_MIN_START_CODE;
2304 2305
                if(s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
                    mb_y += (*buf_ptr&0xE0)<<2;
2306

2307
                mb_y <<= field_pic;
2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318
                if (s2->picture_structure == PICT_BOTTOM_FIELD)
                    mb_y++;

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

                if (s2->last_picture_ptr == NULL) {
                /* Skip B-frames if we do not have reference frames and gop is not closed */
                    if (s2->pict_type == AV_PICTURE_TYPE_B) {
2319
                        if (!s2->closed_gop)
2320 2321 2322
                            break;
                    }
                }
2323
                if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358
                    s->sync=1;
                if (s2->next_picture_ptr == NULL) {
                /* Skip P-frames if we do not have a reference frame or we have an invalid header. */
                    if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) break;
                }
                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)
                    break;

                if (!s->mpeg_enc_ctx_allocated)
                    break;

                if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
                    if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom)
                        break;
                }

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

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

2359
                if (uses_vdpau(avctx)) {
2360 2361 2362 2363 2364 2365 2366 2367
                    s->slice_count++;
                    break;
                }

                if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE)) {
                    int threshold = (s2->mb_height * s->slice_count +
                                     s2->slice_context_count / 2) /
                                    s2->slice_context_count;
2368
                    av_assert0(avctx->thread_count > 1);
2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408
                    if (threshold <= mb_y) {
                        MpegEncContext *thread_context = s2->thread_context[s->slice_count];

                        thread_context->start_mb_y = mb_y;
                        thread_context->end_mb_y   = s2->mb_height;
                        if (s->slice_count) {
                            s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
                            ret = ff_update_duplicate_context(thread_context,
                                                              s2);
                            if (ret < 0)
                                return ret;
                        }
                        init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
                        s->slice_count++;
                    }
                    buf_ptr += 2; // FIXME add minimum number of bytes per slice
                } else {
                    ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
                    emms_c();

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

static int mpeg_decode_frame(AVCodecContext *avctx,
                             void *data, int *got_output,
                             AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
2409
    int ret;
2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
    int buf_size = avpkt->size;
    Mpeg1Context *s = avctx->priv_data;
    AVFrame *picture = data;
    MpegEncContext *s2 = &s->mpeg_enc_ctx;
    av_dlog(avctx, "fill_buffer\n");

    if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
        /* special case for last picture */
        if (s2->low_delay == 0 && s2->next_picture_ptr) {
            int ret = av_frame_ref(picture, &s2->next_picture_ptr->f);
            if (ret < 0)
                return ret;

            s2->next_picture_ptr = NULL;

            *got_output = 1;
        }
        return buf_size;
    }

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

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

2437 2438 2439 2440
    s2->codec_tag = avpriv_toupper4(avctx->codec_tag);
    if (s->mpeg_enc_ctx_allocated == 0 && (   s2->codec_tag == AV_RL32("VCR2")
                                           || s2->codec_tag == AV_RL32("BW10")
                                          ))
2441 2442 2443 2444 2445
        vcr2_init_sequence(avctx);

    s->slice_count = 0;

    if (avctx->extradata && !s->extradata_decoded) {
2446 2447 2448 2449 2450
        ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size);
        if(*got_output) {
            av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
            *got_output = 0;
        }
2451
        s->extradata_decoded = 1;
2452 2453
        if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
            s2->current_picture_ptr = NULL;
2454
            return ret;
2455
        }
2456 2457
    }

2458 2459 2460 2461 2462
    ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
    if (ret<0 || *got_output)
        s2->current_picture_ptr = NULL;

    return ret;
2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474
}


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

    s->sync=0;

    ff_mpeg_flush(avctx);
}

2475
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508
{
    Mpeg1Context *s = avctx->priv_data;

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

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


AVCodec ff_mpeg1video_decoder = {
    .name                  = "mpeg1video",
    .type                  = AVMEDIA_TYPE_VIDEO,
    .id                    = AV_CODEC_ID_MPEG1VIDEO,
    .priv_data_size        = sizeof(Mpeg1Context),
    .init                  = mpeg_decode_init,
    .close                 = mpeg_decode_end,
    .decode                = mpeg_decode_frame,
    .capabilities          = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                             CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                             CODEC_CAP_SLICE_THREADS,
    .flush                 = flush,
2509
    .max_lowres            = 3,
2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525
    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
};

AVCodec ff_mpeg2video_decoder = {
    .name           = "mpeg2video",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                      CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                      CODEC_CAP_SLICE_THREADS,
    .flush          = flush,
2526
    .max_lowres     = 3,
2527 2528 2529 2530
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
    .profiles       = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
};

2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545
//legacy decoder
AVCodec ff_mpegvideo_decoder = {
    .name           = "mpegvideo",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
    .flush          = flush,
    .max_lowres     = 3,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
};

2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610
#if CONFIG_MPEG_XVMC_DECODER
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
{
    if (avctx->active_thread_type & FF_THREAD_SLICE)
        return -1;
    if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
        return -1;
    if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
        av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
    }
    mpeg_decode_init(avctx);

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

    return 0;
}

AVCodec ff_mpeg_xvmc_decoder = {
    .name           = "mpegvideo_xvmc",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO_XVMC,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_mc_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
                      CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
    .flush          = flush,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
};

#endif

#if CONFIG_MPEG_VDPAU_DECODER
AVCodec ff_mpeg_vdpau_decoder = {
    .name           = "mpegvideo_vdpau",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG2VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
                      CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
    .flush          = flush,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
};
#endif

#if CONFIG_MPEG1_VDPAU_DECODER
AVCodec ff_mpeg1_vdpau_decoder = {
    .name           = "mpeg1video_vdpau",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MPEG1VIDEO,
    .priv_data_size = sizeof(Mpeg1Context),
    .init           = mpeg_decode_init,
    .close          = mpeg_decode_end,
    .decode         = mpeg_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED |
                      CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
    .flush          = flush,
    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
};
#endif