69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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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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/**
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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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