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59 lines
1.6 KiB
59 lines
1.6 KiB
/* |
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* MPEG1/2 common code |
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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 FFMPEG_MPEG12_H |
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#define FFMPEG_MPEG12_H |
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#include "mpegvideo.h" |
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#define DC_VLC_BITS 9 |
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#define TEX_VLC_BITS 9 |
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static VLC dc_lum_vlc; |
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static VLC dc_chroma_vlc; |
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extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; |
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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) |
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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, dc_lum_vlc.table, DC_VLC_BITS, 2); |
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} else { |
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code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2); |
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} |
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if (code < 0){ |
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av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n"); |
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return 0xffff; |
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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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#endif /* FFMPEG_MPEG12_H */
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