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51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
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/*
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* MPEG-1/2 decoder header
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* Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
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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
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_MPEG12DEC_H
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#define AVCODEC_MPEG12DEC_H
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#include "get_bits.h"
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#include "mpeg12vlc.h"
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static inline int decode_dc(GetBitContext *gb, int component)
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{
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int code, diff;
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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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}
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if (code == 0) {
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diff = 0;
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} else {
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diff = get_xbits(gb, code);
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}
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return diff;
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}
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int ff_mpeg1_decode_block_intra(GetBitContext *gb,
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const uint16_t *quant_matrix,
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const uint8_t *scantable, int last_dc[3],
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int16_t *block, int index, int qscale);
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#endif /* AVCODEC_MPEG12DEC_H */
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