mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
|
|
* MPEG-1/2 decoder header
|
|
* 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
|
|
*/
|
|
|
|
#ifndef AVCODEC_MPEG12DEC_H
|
|
#define AVCODEC_MPEG12DEC_H
|
|
|
|
#include "get_bits.h"
|
|
#include "mpeg12vlc.h"
|
|
#include "rl.h"
|
|
|
|
#define INIT_2D_VLC_RL(rl, static_size, flags)\
|
|
{\
|
|
static RL_VLC_ELEM rl_vlc_table[static_size];\
|
|
rl.rl_vlc[0] = rl_vlc_table;\
|
|
ff_init_2d_vlc_rl(&rl, static_size, flags);\
|
|
}
|
|
|
|
void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags);
|
|
|
|
static inline int decode_dc(GetBitContext *gb, int component)
|
|
{
|
|
int code, diff;
|
|
|
|
if (component == 0) {
|
|
code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
|
|
} else {
|
|
code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
|
|
}
|
|
if (code == 0) {
|
|
diff = 0;
|
|
} else {
|
|
diff = get_xbits(gb, code);
|
|
}
|
|
return diff;
|
|
}
|
|
|
|
int ff_mpeg1_decode_block_intra(GetBitContext *gb,
|
|
const uint16_t *quant_matrix,
|
|
const uint8_t *scantable, int last_dc[3],
|
|
int16_t *block, int index, int qscale);
|
|
|
|
#endif /* AVCODEC_MPEG12DEC_H */
|