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76 lines
2.4 KiB
76 lines
2.4 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 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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