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77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_MPEG12_H
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#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 TEX_VLC_BITS 9
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extern VLC ff_dc_lum_vlc;
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extern VLC ff_dc_chroma_vlc;
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typedef struct Mpeg1Context {
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MpegEncContext mpeg_enc_ctx;
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int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
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int repeat_field; /* true if we must repeat the field */
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AVPanScan pan_scan; /**< some temporary storage for the panscan */
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int slice_count;
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int swap_uv;//indicate VCR2
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int save_aspect_info;
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int save_width, save_height, save_progressive_seq;
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AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
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int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
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int closed_gop; ///< GOP is closed
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int extradata_decoded;
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} Mpeg1Context;
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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, 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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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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extern int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
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#endif /* AVCODEC_MPEG12_H */
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