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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Justin Ruggles |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file |
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| 23 | * Vorbis audio parser |
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| 24 | * |
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| 25 | * Determines the duration for each packet. |
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| 26 | */ |
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| 27 | |||
| 28 | #ifndef AVCODEC_VORBIS_PARSER_H |
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| 29 | #define AVCODEC_VORBIS_PARSER_H |
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| 30 | |||
| 31 | #include "avcodec.h" |
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| 32 | |||
| 33 | typedef struct VorbisParseContext { |
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| 34 | AVCodecContext *avctx; ///< codec context |
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| 35 | int extradata_parsed; ///< we have attempted to parse extradata |
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| 36 | int valid_extradata; ///< extradata is valid, so we can calculate duration |
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| 37 | int blocksize[2]; ///< short and long window sizes |
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| 38 | int previous_blocksize; ///< previous window size |
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| 39 | int mode_blocksize[64]; ///< window size mapping for each mode |
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| 40 | int mode_count; ///< number of modes |
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| 41 | int mode_mask; ///< bitmask used to get the mode in each packet |
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| 42 | int prev_mask; ///< bitmask used to get the previous mode flag in each packet |
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| 43 | } VorbisParseContext; |
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| 44 | |||
| 45 | /** |
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| 46 | * Initialize the Vorbis parser using headers in the extradata. |
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| 47 | * |
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| 48 | * @param avctx codec context |
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| 49 | * @param s Vorbis parser context |
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| 50 | */ |
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| 51 | int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, VorbisParseContext *s); |
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| 52 | |||
| 53 | /** |
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| 54 | * Get the duration for a Vorbis packet. |
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| 55 | * |
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| 56 | * avpriv_vorbis_parse_extradata() must have been successfully called prior to |
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| 57 | * this in order for a correct duration to be returned. |
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| 58 | * |
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| 59 | * @param s Vorbis parser context |
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| 60 | * @param buf buffer containing a Vorbis frame |
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| 61 | * @param buf_size size of the buffer |
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| 62 | */ |
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| 63 | int avpriv_vorbis_parse_frame(VorbisParseContext *s, const uint8_t *buf, |
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| 64 | int buf_size); |
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| 65 | |||
| 66 | void avpriv_vorbis_parse_reset(VorbisParseContext *s); |
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| 67 | |||
| 68 | #endif /* AVCODEC_VORBIS_PARSER_H */ |