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2ba45a60 DM |
1 | /* |
2 | * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions | |
3 | * Copyright (c) 2008 Justin Ruggles | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions | |
25 | */ | |
26 | ||
27 | #ifndef AVCODEC_FLAC_H | |
28 | #define AVCODEC_FLAC_H | |
29 | ||
30 | #include "avcodec.h" | |
31 | #include "bytestream.h" | |
32 | #include "get_bits.h" | |
33 | ||
34 | #define FLAC_STREAMINFO_SIZE 34 | |
35 | #define FLAC_MAX_CHANNELS 8 | |
36 | #define FLAC_MIN_BLOCKSIZE 16 | |
37 | #define FLAC_MAX_BLOCKSIZE 65535 | |
38 | #define FLAC_MIN_FRAME_SIZE 11 | |
39 | ||
40 | enum { | |
41 | FLAC_CHMODE_INDEPENDENT = 0, | |
42 | FLAC_CHMODE_LEFT_SIDE = 1, | |
43 | FLAC_CHMODE_RIGHT_SIDE = 2, | |
44 | FLAC_CHMODE_MID_SIDE = 3, | |
45 | }; | |
46 | ||
47 | enum { | |
48 | FLAC_METADATA_TYPE_STREAMINFO = 0, | |
49 | FLAC_METADATA_TYPE_PADDING, | |
50 | FLAC_METADATA_TYPE_APPLICATION, | |
51 | FLAC_METADATA_TYPE_SEEKTABLE, | |
52 | FLAC_METADATA_TYPE_VORBIS_COMMENT, | |
53 | FLAC_METADATA_TYPE_CUESHEET, | |
54 | FLAC_METADATA_TYPE_PICTURE, | |
55 | FLAC_METADATA_TYPE_INVALID = 127 | |
56 | }; | |
57 | ||
58 | enum FLACExtradataFormat { | |
59 | FLAC_EXTRADATA_FORMAT_STREAMINFO = 0, | |
60 | FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1 | |
61 | }; | |
62 | ||
63 | #define FLACCOMMONINFO \ | |
64 | int samplerate; /**< sample rate */\ | |
65 | int channels; /**< number of channels */\ | |
66 | int bps; /**< bits-per-sample */\ | |
67 | ||
68 | /** | |
69 | * Data needed from the Streaminfo header for use by the raw FLAC demuxer | |
70 | * and/or the FLAC decoder. | |
71 | */ | |
72 | #define FLACSTREAMINFO \ | |
73 | FLACCOMMONINFO \ | |
74 | int max_blocksize; /**< maximum block size, in samples */\ | |
75 | int max_framesize; /**< maximum frame size, in bytes */\ | |
76 | int64_t samples; /**< total number of samples */\ | |
77 | ||
78 | typedef struct FLACStreaminfo { | |
79 | FLACSTREAMINFO | |
80 | } FLACStreaminfo; | |
81 | ||
82 | typedef struct FLACFrameInfo { | |
83 | FLACCOMMONINFO | |
84 | int blocksize; /**< block size of the frame */ | |
85 | int ch_mode; /**< channel decorrelation mode */ | |
86 | int64_t frame_or_sample_num; /**< frame number or sample number */ | |
87 | int is_var_size; /**< specifies if the stream uses variable | |
88 | block sizes or a fixed block size; | |
89 | also determines the meaning of | |
90 | frame_or_sample_num */ | |
91 | } FLACFrameInfo; | |
92 | ||
93 | /** | |
94 | * Parse the Streaminfo metadata block | |
95 | * @param[out] avctx codec context to set basic stream parameters | |
96 | * @param[out] s where parsed information is stored | |
97 | * @param[in] buffer pointer to start of 34-byte streaminfo data | |
98 | */ | |
f6fa7814 DM |
99 | void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, |
100 | const uint8_t *buffer); | |
101 | ||
102 | #if LIBAVCODEC_VERSION_MAJOR < 57 | |
2ba45a60 DM |
103 | void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, |
104 | const uint8_t *buffer); | |
f6fa7814 DM |
105 | int avpriv_flac_is_extradata_valid(AVCodecContext *avctx, |
106 | enum FLACExtradataFormat *format, | |
107 | uint8_t **streaminfo_start); | |
108 | #endif | |
2ba45a60 DM |
109 | |
110 | /** | |
111 | * Validate the FLAC extradata. | |
112 | * @param[in] avctx codec context containing the extradata. | |
113 | * @param[out] format extradata format. | |
114 | * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data. | |
115 | * @return 1 if valid, 0 if not valid. | |
116 | */ | |
f6fa7814 DM |
117 | int ff_flac_is_extradata_valid(AVCodecContext *avctx, |
118 | enum FLACExtradataFormat *format, | |
119 | uint8_t **streaminfo_start); | |
2ba45a60 DM |
120 | |
121 | /** | |
122 | * Calculate an estimate for the maximum frame size based on verbatim mode. | |
123 | * @param blocksize block size, in samples | |
124 | * @param ch number of channels | |
125 | * @param bps bits-per-sample | |
126 | */ | |
127 | int ff_flac_get_max_frame_size(int blocksize, int ch, int bps); | |
128 | ||
129 | /** | |
130 | * Validate and decode a frame header. | |
131 | * @param avctx AVCodecContext to use as av_log() context | |
132 | * @param gb GetBitContext from which to read frame header | |
133 | * @param[out] fi frame information | |
134 | * @param log_level_offset log level offset. can be used to silence error messages. | |
135 | * @return non-zero on error, 0 if ok | |
136 | */ | |
137 | int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, | |
138 | FLACFrameInfo *fi, int log_level_offset); | |
139 | ||
140 | void ff_flac_set_channel_layout(AVCodecContext *avctx); | |
141 | ||
142 | /** | |
143 | * Parse the metadata block parameters from the header. | |
144 | * @param[in] block_header header data, at least 4 bytes | |
145 | * @param[out] last indicator for last metadata block | |
146 | * @param[out] type metadata block type | |
147 | * @param[out] size metadata block size | |
148 | */ | |
149 | static av_always_inline void flac_parse_block_header(const uint8_t *block_header, | |
150 | int *last, int *type, int *size) | |
151 | { | |
152 | int tmp = bytestream_get_byte(&block_header); | |
153 | if (last) | |
154 | *last = tmp & 0x80; | |
155 | if (type) | |
156 | *type = tmp & 0x7F; | |
157 | if (size) | |
158 | *size = bytestream_get_be24(&block_header); | |
159 | } | |
160 | ||
161 | #endif /* AVCODEC_FLAC_H */ |