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68 lines
2.4 KiB
68 lines
2.4 KiB
/* |
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* Copyright (c) 2012 Justin Ruggles |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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