mpeg12.h 2.14 KB
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/*
 * MPEG1/2 common code
 * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#ifndef AVCODEC_MPEG12_H
#define AVCODEC_MPEG12_H
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#include "mpegvideo.h"

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#define DC_VLC_BITS 9
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#define MV_VLC_BITS 9
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#define TEX_VLC_BITS 9

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

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extern VLC ff_dc_lum_vlc;
extern VLC ff_dc_chroma_vlc;
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extern VLC ff_mbincr_vlc;
extern VLC ff_mb_ptype_vlc;
extern VLC ff_mb_btype_vlc;
extern VLC ff_mb_pat_vlc;
extern VLC ff_mv_vlc;
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extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];

void ff_mpeg12_common_init(MpegEncContext *s);
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void ff_mpeg12_init_vlcs(void);
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static inline int decode_dc(GetBitContext *gb, int component)
{
    int code, diff;

    if (component == 0) {
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        code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
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    } else {
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        code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
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    }
    if (code < 0){
        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
        return 0xffff;
    }
    if (code == 0) {
        diff = 0;
    } else {
        diff = get_xbits(gb, code);
    }
    return diff;
}
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int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n);
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void ff_mpeg1_clean_buffers(MpegEncContext *s);
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
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#endif /* AVCODEC_MPEG12_H */