yading@10: /*
yading@10:  * Copyright (c) 2012 Justin Ruggles
yading@10:  *
yading@10:  * This file is part of Libav.
yading@10:  *
yading@10:  * Libav is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * Libav is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with Libav; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Vorbis audio parser
yading@10:  *
yading@10:  * Determines the duration for each packet.
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_VORBIS_PARSER_H
yading@10: #define AVCODEC_VORBIS_PARSER_H
yading@10: 
yading@10: #include "avcodec.h"
yading@10: 
yading@10: typedef struct VorbisParseContext {
yading@10:     AVCodecContext *avctx;      ///< codec context
yading@10:     int extradata_parsed;       ///< we have attempted to parse extradata
yading@10:     int valid_extradata;        ///< extradata is valid, so we can calculate duration
yading@10:     int blocksize[2];           ///< short and long window sizes
yading@10:     int previous_blocksize;     ///< previous window size
yading@10:     int mode_blocksize[64];     ///< window size mapping for each mode
yading@10:     int mode_count;             ///< number of modes
yading@10:     int mode_mask;              ///< bitmask used to get the mode in each packet
yading@10:     int prev_mask;              ///< bitmask used to get the previous mode flag in each packet
yading@10: } VorbisParseContext;
yading@10: 
yading@10: /**
yading@10:  * Initialize the Vorbis parser using headers in the extradata.
yading@10:  *
yading@10:  * @param avctx codec context
yading@10:  * @param s     Vorbis parser context
yading@10:  */
yading@10: int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, VorbisParseContext *s);
yading@10: 
yading@10: /**
yading@10:  * Get the duration for a Vorbis packet.
yading@10:  *
yading@10:  * avpriv_vorbis_parse_extradata() must have been successfully called prior to
yading@10:  * this in order for a correct duration to be returned.
yading@10:  *
yading@10:  * @param s        Vorbis parser context
yading@10:  * @param buf      buffer containing a Vorbis frame
yading@10:  * @param buf_size size of the buffer
yading@10:  */
yading@10: int avpriv_vorbis_parse_frame(VorbisParseContext *s, const uint8_t *buf,
yading@10:                               int buf_size);
yading@10: 
yading@10: void avpriv_vorbis_parse_reset(VorbisParseContext *s);
yading@10: 
yading@10: #endif /* AVCODEC_VORBIS_PARSER_H */