2 * Copyright (c) 2012 Justin Ruggles
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * Determines the duration for each packet.
28 #ifndef AVCODEC_VORBIS_PARSER_H
29 #define AVCODEC_VORBIS_PARSER_H
32 #include "vorbis_parser.h"
34 struct AVVorbisParseContext
{
36 int extradata_parsed
; ///< we have attempted to parse extradata
37 int valid_extradata
; ///< extradata is valid, so we can calculate duration
38 int blocksize
[2]; ///< short and long window sizes
39 int previous_blocksize
; ///< previous window size
40 int mode_blocksize
[64]; ///< window size mapping for each mode
41 int mode_count
; ///< number of modes
42 int mode_mask
; ///< bitmask used to get the mode in each packet
43 int prev_mask
; ///< bitmask used to get the previous mode flag in each packet
46 #if LIBAVCODEC_VERSION_MAJOR < 57
48 * Initialize the Vorbis parser using headers in the extradata.
50 * @param avctx codec context
51 * @param s Vorbis parser context
53 int avpriv_vorbis_parse_extradata(AVCodecContext
*avctx
, AVVorbisParseContext
*s
);
56 * Get the duration for a Vorbis packet.
58 * avpriv_vorbis_parse_extradata() must have been successfully called prior to
59 * this in order for a correct duration to be returned. If @p flags is @c NULL,
60 * special frames are considered invalid.
62 * @param s Vorbis parser context
63 * @param buf buffer containing a Vorbis frame
64 * @param buf_size size of the buffer
65 * @param flags flags for special frames
67 int avpriv_vorbis_parse_frame_flags(AVVorbisParseContext
*s
, const uint8_t *buf
,
68 int buf_size
, int *flags
);
71 * Get the duration for a Vorbis packet.
73 * avpriv_vorbis_parse_extradata() must have been successfully called prior to
74 * this in order for a correct duration to be returned.
76 * @param s Vorbis parser context
77 * @param buf buffer containing a Vorbis frame
78 * @param buf_size size of the buffer
80 int avpriv_vorbis_parse_frame(AVVorbisParseContext
*s
, const uint8_t *buf
,
83 void avpriv_vorbis_parse_reset(AVVorbisParseContext
*s
);
86 #endif /* AVCODEC_VORBIS_PARSER_H */