mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-16 20:35:23 +00:00
69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
|
|
* Copyright (c) 2012 Justin Ruggles
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Vorbis audio parser
|
|
*
|
|
* Determines the duration for each packet.
|
|
*/
|
|
|
|
#ifndef AVCODEC_VORBIS_PARSER_H
|
|
#define AVCODEC_VORBIS_PARSER_H
|
|
|
|
#include "avcodec.h"
|
|
|
|
typedef struct VorbisParseContext {
|
|
AVCodecContext *avctx; ///< codec context
|
|
int extradata_parsed; ///< we have attempted to parse extradata
|
|
int valid_extradata; ///< extradata is valid, so we can calculate duration
|
|
int blocksize[2]; ///< short and long window sizes
|
|
int previous_blocksize; ///< previous window size
|
|
int mode_blocksize[64]; ///< window size mapping for each mode
|
|
int mode_count; ///< number of modes
|
|
int mode_mask; ///< bitmask used to get the mode in each packet
|
|
int prev_mask; ///< bitmask used to get the previous mode flag in each packet
|
|
} VorbisParseContext;
|
|
|
|
/**
|
|
* Initialize the Vorbis parser using headers in the extradata.
|
|
*
|
|
* @param avctx codec context
|
|
* @param s Vorbis parser context
|
|
*/
|
|
int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, VorbisParseContext *s);
|
|
|
|
/**
|
|
* Get the duration for a Vorbis packet.
|
|
*
|
|
* avpriv_vorbis_parse_extradata() must have been successfully called prior to
|
|
* this in order for a correct duration to be returned.
|
|
*
|
|
* @param s Vorbis parser context
|
|
* @param buf buffer containing a Vorbis frame
|
|
* @param buf_size size of the buffer
|
|
*/
|
|
int avpriv_vorbis_parse_frame(VorbisParseContext *s, const uint8_t *buf,
|
|
int buf_size);
|
|
|
|
void avpriv_vorbis_parse_reset(VorbisParseContext *s);
|
|
|
|
#endif /* AVCODEC_VORBIS_PARSER_H */
|