590101bbad7a433d698391c28bec5bbdbfbe2763
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
33 typedef struct VorbisParseContext
{
34 AVCodecContext
*avctx
; ///< codec context
35 int extradata_parsed
; ///< we have attempted to parse extradata
36 int valid_extradata
; ///< extradata is valid, so we can calculate duration
37 int blocksize
[2]; ///< short and long window sizes
38 int previous_blocksize
; ///< previous window size
39 int mode_blocksize
[64]; ///< window size mapping for each mode
40 int mode_count
; ///< number of modes
41 int mode_mask
; ///< bitmask used to get the mode in each packet
42 int prev_mask
; ///< bitmask used to get the previous mode flag in each packet
46 * Initialize the Vorbis parser using headers in the extradata.
48 * @param avctx codec context
49 * @param s Vorbis parser context
51 int avpriv_vorbis_parse_extradata(AVCodecContext
*avctx
, VorbisParseContext
*s
);
53 #define VORBIS_FLAG_HEADER 0x00000001
54 #define VORBIS_FLAG_COMMENT 0x00000002
57 * Get the duration for a Vorbis packet.
59 * avpriv_vorbis_parse_extradata() must have been successfully called prior to
60 * this in order for a correct duration to be returned. If @p flags is @c NULL,
61 * special frames are considered invalid.
63 * @param s Vorbis parser context
64 * @param buf buffer containing a Vorbis frame
65 * @param buf_size size of the buffer
66 * @param flags flags for special frames
68 int avpriv_vorbis_parse_frame_flags(VorbisParseContext
*s
, const uint8_t *buf
,
69 int buf_size
, int *flags
);
72 * Get the duration for a Vorbis packet.
74 * avpriv_vorbis_parse_extradata() must have been successfully called prior to
75 * this in order for a correct duration to be returned.
77 * @param s Vorbis parser context
78 * @param buf buffer containing a Vorbis frame
79 * @param buf_size size of the buffer
81 int avpriv_vorbis_parse_frame(VorbisParseContext
*s
, const uint8_t *buf
,
84 void avpriv_vorbis_parse_reset(VorbisParseContext
*s
);
86 #endif /* AVCODEC_VORBIS_PARSER_H */