1/* 2 * MPEG-1/2 decoder header 3 * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVCODEC_MPEG12DEC_H 23#define AVCODEC_MPEG12DEC_H 24 25#include "get_bits.h" 26#include "mpeg12vlc.h" 27#include "rl.h" 28 29#define INIT_2D_VLC_RL(rl, static_size, flags)\ 30{\ 31 static RL_VLC_ELEM rl_vlc_table[static_size];\ 32 rl.rl_vlc[0] = rl_vlc_table;\ 33 ff_init_2d_vlc_rl(&rl, static_size, flags);\ 34} 35 36void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags); 37 38static inline int decode_dc(GetBitContext *gb, int component) 39{ 40 int code, diff; 41 42 if (component == 0) { 43 code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2); 44 } else { 45 code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2); 46 } 47 if (code == 0) { 48 diff = 0; 49 } else { 50 diff = get_xbits(gb, code); 51 } 52 return diff; 53} 54 55int ff_mpeg1_decode_block_intra(GetBitContext *gb, 56 const uint16_t *quant_matrix, 57 const uint8_t *scantable, int last_dc[3], 58 int16_t *block, int index, int qscale); 59 60#endif /* AVCODEC_MPEG12DEC_H */ 61