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libavcodec
vorbis_parser.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2012 Justin Ruggles
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file
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* Vorbis audio parser
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*
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* Determines the duration for each packet.
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*/
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#ifndef AVCODEC_VORBIS_PARSER_H
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#define AVCODEC_VORBIS_PARSER_H
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#include "
avcodec.h
"
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typedef
struct
VorbisParseContext
{
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AVCodecContext
*
avctx
;
///< codec context
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int
extradata_parsed
;
///< we have attempted to parse extradata
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int
valid_extradata
;
///< extradata is valid, so we can calculate duration
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int
blocksize
[2];
///< short and long window sizes
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int
previous_blocksize
;
///< previous window size
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int
mode_blocksize
[64];
///< window size mapping for each mode
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int
mode_count
;
///< number of modes
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int
mode_mask
;
///< bitmask used to get the mode in each packet
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int
prev_mask
;
///< bitmask used to get the previous mode flag in each packet
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}
VorbisParseContext
;
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/**
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* Initialize the Vorbis parser using headers in the extradata.
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*
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* @param avctx codec context
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* @param s Vorbis parser context
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*/
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int
avpriv_vorbis_parse_extradata
(
AVCodecContext
*avctx,
VorbisParseContext
*
s
);
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#define VORBIS_FLAG_HEADER 0x00000001
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#define VORBIS_FLAG_COMMENT 0x00000002
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/**
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* Get the duration for a Vorbis packet.
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*
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* avpriv_vorbis_parse_extradata() must have been successfully called prior to
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* this in order for a correct duration to be returned. If @p flags is @c NULL,
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* special frames are considered invalid.
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*
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* @param s Vorbis parser context
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* @param buf buffer containing a Vorbis frame
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* @param buf_size size of the buffer
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* @param flags flags for special frames
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*/
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int
avpriv_vorbis_parse_frame_flags
(
VorbisParseContext
*
s
,
const
uint8_t
*
buf
,
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int
buf_size,
int
*
flags
);
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/**
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* Get the duration for a Vorbis packet.
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*
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* avpriv_vorbis_parse_extradata() must have been successfully called prior to
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* this in order for a correct duration to be returned.
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*
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* @param s Vorbis parser context
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* @param buf buffer containing a Vorbis frame
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* @param buf_size size of the buffer
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*/
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int
avpriv_vorbis_parse_frame
(
VorbisParseContext
*
s
,
const
uint8_t
*
buf
,
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int
buf_size);
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void
avpriv_vorbis_parse_reset
(
VorbisParseContext
*
s
);
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#endif
/* AVCODEC_VORBIS_PARSER_H */
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