Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / vorbis_parser_internal.h
1 /*
2 * Copyright (c) 2012 Justin Ruggles
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 /**
22 * @file
23 * Vorbis audio parser
24 *
25 * Determines the duration for each packet.
26 */
27
28 #ifndef AVCODEC_VORBIS_PARSER_H
29 #define AVCODEC_VORBIS_PARSER_H
30
31 #include "avcodec.h"
32 #include "vorbis_parser.h"
33
34 struct AVVorbisParseContext {
35 const AVClass *class;
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
44 };
45
46 #if LIBAVCODEC_VERSION_MAJOR < 57
47 /**
48 * Initialize the Vorbis parser using headers in the extradata.
49 *
50 * @param avctx codec context
51 * @param s Vorbis parser context
52 */
53 int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, AVVorbisParseContext *s);
54
55 /**
56 * Get the duration for a Vorbis packet.
57 *
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.
61 *
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
66 */
67 int avpriv_vorbis_parse_frame_flags(AVVorbisParseContext *s, const uint8_t *buf,
68 int buf_size, int *flags);
69
70 /**
71 * Get the duration for a Vorbis packet.
72 *
73 * avpriv_vorbis_parse_extradata() must have been successfully called prior to
74 * this in order for a correct duration to be returned.
75 *
76 * @param s Vorbis parser context
77 * @param buf buffer containing a Vorbis frame
78 * @param buf_size size of the buffer
79 */
80 int avpriv_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf,
81 int buf_size);
82
83 void avpriv_vorbis_parse_reset(AVVorbisParseContext *s);
84 #endif
85
86 #endif /* AVCODEC_VORBIS_PARSER_H */