/* * MPEG1/2 common code * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_MPEG12_H #define AVCODEC_MPEG12_H #include "mpegvideo.h" #define DC_VLC_BITS 9 #define TEX_VLC_BITS 9 extern VLC ff_dc_lum_vlc; extern VLC ff_dc_chroma_vlc; typedef struct Mpeg1Context { MpegEncContext mpeg_enc_ctx; int mpeg_enc_ctx_allocated; /* true if decoding context allocated */ int repeat_field; /* true if we must repeat the field */ AVPanScan pan_scan; /**< some temporary storage for the panscan */ int slice_count; int swap_uv;//indicate VCR2 int save_aspect_info; int save_width, save_height, save_progressive_seq; AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame? int tmpgexs; int parsed_extra; } Mpeg1Context; extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; void ff_mpeg12_common_init(MpegEncContext *s); void ff_mpeg12_init_vlcs(void); static inline int decode_dc(GetBitContext *gb, int component) { int code, diff; if (component == 0) { code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2); } else { code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2); } if (code < 0){ av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n"); return 0xffff; } if (code == 0) { diff = 0; } else { diff = get_xbits(gb, code); } return diff; } extern int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n); #endif /* AVCODEC_MPEG12_H */