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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions |
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| 3 | * Copyright (c) 2008 Justin Ruggles |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions |
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| 25 | */ |
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| 26 | |||
| 27 | #ifndef AVCODEC_FLAC_H |
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| 28 | #define AVCODEC_FLAC_H |
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| 29 | |||
| 30 | #include "avcodec.h" |
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| 31 | #include "get_bits.h" |
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| 32 | |||
| 33 | #define FLAC_STREAMINFO_SIZE 34 |
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| 34 | #define FLAC_MAX_CHANNELS 8 |
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| 35 | #define FLAC_MIN_BLOCKSIZE 16 |
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| 36 | #define FLAC_MAX_BLOCKSIZE 65535 |
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| 37 | #define FLAC_MIN_FRAME_SIZE 11 |
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| 38 | |||
| 39 | enum { |
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| 40 | FLAC_CHMODE_INDEPENDENT = 0, |
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| 41 | FLAC_CHMODE_LEFT_SIDE = 1, |
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| 42 | FLAC_CHMODE_RIGHT_SIDE = 2, |
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| 43 | FLAC_CHMODE_MID_SIDE = 3, |
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| 44 | }; |
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| 45 | |||
| 46 | enum { |
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| 47 | FLAC_METADATA_TYPE_STREAMINFO = 0, |
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| 48 | FLAC_METADATA_TYPE_PADDING, |
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| 49 | FLAC_METADATA_TYPE_APPLICATION, |
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| 50 | FLAC_METADATA_TYPE_SEEKTABLE, |
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| 51 | FLAC_METADATA_TYPE_VORBIS_COMMENT, |
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| 52 | FLAC_METADATA_TYPE_CUESHEET, |
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| 53 | FLAC_METADATA_TYPE_PICTURE, |
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| 54 | FLAC_METADATA_TYPE_INVALID = 127 |
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| 55 | }; |
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| 56 | |||
| 57 | enum FLACExtradataFormat { |
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| 58 | FLAC_EXTRADATA_FORMAT_STREAMINFO = 0, |
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| 59 | FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1 |
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| 60 | }; |
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| 61 | |||
| 62 | #define FLACCOMMONINFO \ |
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| 63 | int samplerate; /**< sample rate */\ |
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| 64 | int channels; /**< number of channels */\ |
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| 65 | int bps; /**< bits-per-sample */\ |
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| 66 | |||
| 67 | /** |
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| 68 | * Data needed from the Streaminfo header for use by the raw FLAC demuxer |
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| 69 | * and/or the FLAC decoder. |
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| 70 | */ |
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| 71 | #define FLACSTREAMINFO \ |
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| 72 | FLACCOMMONINFO \ |
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| 73 | int max_blocksize; /**< maximum block size, in samples */\ |
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| 74 | int max_framesize; /**< maximum frame size, in bytes */\ |
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| 75 | int64_t samples; /**< total number of samples */\ |
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| 76 | |||
| 77 | typedef struct FLACStreaminfo { |
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| 78 | FLACSTREAMINFO |
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| 79 | } FLACStreaminfo; |
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| 80 | |||
| 81 | typedef struct FLACFrameInfo { |
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| 82 | FLACCOMMONINFO |
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| 83 | int blocksize; /**< block size of the frame */ |
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| 84 | int ch_mode; /**< channel decorrelation mode */ |
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| 85 | int64_t frame_or_sample_num; /**< frame number or sample number */ |
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| 86 | int is_var_size; /**< specifies if the stream uses variable |
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| 87 | block sizes or a fixed block size; |
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| 88 | also determines the meaning of |
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| 89 | frame_or_sample_num */ |
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| 90 | } FLACFrameInfo; |
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| 91 | |||
| 92 | /** |
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| 93 | * Parse the Streaminfo metadata block |
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| 94 | * @param[out] avctx codec context to set basic stream parameters |
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| 95 | * @param[out] s where parsed information is stored |
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| 96 | * @param[in] buffer pointer to start of 34-byte streaminfo data |
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| 97 | */ |
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| 98 | void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, |
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| 99 | const uint8_t *buffer); |
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| 100 | |||
| 101 | /** |
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| 102 | * Validate the FLAC extradata. |
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| 103 | * @param[in] avctx codec context containing the extradata. |
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| 104 | * @param[out] format extradata format. |
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| 105 | * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data. |
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| 106 | * @return 1 if valid, 0 if not valid. |
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| 107 | */ |
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| 108 | int avpriv_flac_is_extradata_valid(AVCodecContext *avctx, |
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| 109 | enum FLACExtradataFormat *format, |
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| 110 | uint8_t **streaminfo_start); |
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| 111 | |||
| 112 | /** |
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| 113 | * Parse the metadata block parameters from the header. |
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| 114 | * @param[in] block_header header data, at least 4 bytes |
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| 115 | * @param[out] last indicator for last metadata block |
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| 116 | * @param[out] type metadata block type |
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| 117 | * @param[out] size metadata block size |
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| 118 | */ |
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| 119 | void avpriv_flac_parse_block_header(const uint8_t *block_header, |
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| 120 | int *last, int *type, int *size); |
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| 121 | |||
| 122 | /** |
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| 123 | * Calculate an estimate for the maximum frame size based on verbatim mode. |
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| 124 | * @param blocksize block size, in samples |
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| 125 | * @param ch number of channels |
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| 126 | * @param bps bits-per-sample |
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| 127 | */ |
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| 128 | int ff_flac_get_max_frame_size(int blocksize, int ch, int bps); |
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| 129 | |||
| 130 | /** |
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| 131 | * Validate and decode a frame header. |
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| 132 | * @param avctx AVCodecContext to use as av_log() context |
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| 133 | * @param gb GetBitContext from which to read frame header |
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| 134 | * @param[out] fi frame information |
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| 135 | * @param log_level_offset log level offset. can be used to silence error messages. |
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| 136 | * @return non-zero on error, 0 if ok |
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| 137 | */ |
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| 138 | int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, |
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| 139 | FLACFrameInfo *fi, int log_level_offset); |
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| 140 | |||
| 141 | void ff_flac_set_channel_layout(AVCodecContext *avctx); |
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| 142 | |||
| 143 | #endif /* AVCODEC_FLAC_H */ |