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Diffstat (limited to 'media/ffvpx/libavcodec/flac.h')
| -rw-r--r-- | media/ffvpx/libavcodec/flac.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/flac.h b/media/ffvpx/libavcodec/flac.h new file mode 100644 index 000000000..96d971c9d --- /dev/null +++ b/media/ffvpx/libavcodec/flac.h @@ -0,0 +1,153 @@ +/* + * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions + * Copyright (c) 2008 Justin Ruggles + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * FLAC (Free Lossless Audio Codec) decoder/demuxer common functions + */ + +#ifndef AVCODEC_FLAC_H +#define AVCODEC_FLAC_H + +#include "avcodec.h" +#include "bytestream.h" +#include "get_bits.h" + +#define FLAC_STREAMINFO_SIZE 34 +#define FLAC_MAX_CHANNELS 8 +#define FLAC_MIN_BLOCKSIZE 16 +#define FLAC_MAX_BLOCKSIZE 65535 +#define FLAC_MIN_FRAME_SIZE 11 + +enum { + FLAC_CHMODE_INDEPENDENT = 0, + FLAC_CHMODE_LEFT_SIDE = 1, + FLAC_CHMODE_RIGHT_SIDE = 2, + FLAC_CHMODE_MID_SIDE = 3, +}; + +enum { + FLAC_METADATA_TYPE_STREAMINFO = 0, + FLAC_METADATA_TYPE_PADDING, + FLAC_METADATA_TYPE_APPLICATION, + FLAC_METADATA_TYPE_SEEKTABLE, + FLAC_METADATA_TYPE_VORBIS_COMMENT, + FLAC_METADATA_TYPE_CUESHEET, + FLAC_METADATA_TYPE_PICTURE, + FLAC_METADATA_TYPE_INVALID = 127 +}; + +enum FLACExtradataFormat { + FLAC_EXTRADATA_FORMAT_STREAMINFO = 0, + FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1 +}; + +#define FLACCOMMONINFO \ + int samplerate; /**< sample rate */\ + int channels; /**< number of channels */\ + int bps; /**< bits-per-sample */\ + +/** + * Data needed from the Streaminfo header for use by the raw FLAC demuxer + * and/or the FLAC decoder. + */ +#define FLACSTREAMINFO \ + FLACCOMMONINFO \ + int max_blocksize; /**< maximum block size, in samples */\ + int max_framesize; /**< maximum frame size, in bytes */\ + int64_t samples; /**< total number of samples */\ + +typedef struct FLACStreaminfo { + FLACSTREAMINFO +} FLACStreaminfo; + +typedef struct FLACFrameInfo { + FLACCOMMONINFO + int blocksize; /**< block size of the frame */ + int ch_mode; /**< channel decorrelation mode */ + int64_t frame_or_sample_num; /**< frame number or sample number */ + int is_var_size; /**< specifies if the stream uses variable + block sizes or a fixed block size; + also determines the meaning of + frame_or_sample_num */ +} FLACFrameInfo; + +/** + * Parse the Streaminfo metadata block + * @param[out] avctx codec context to set basic stream parameters + * @param[out] s where parsed information is stored + * @param[in] buffer pointer to start of 34-byte streaminfo data + */ +void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s, + const uint8_t *buffer); + +/** + * Validate the FLAC extradata. + * @param[in] avctx codec context containing the extradata. + * @param[out] format extradata format. + * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data. + * @return 1 if valid, 0 if not valid. + */ +int ff_flac_is_extradata_valid(AVCodecContext *avctx, + enum FLACExtradataFormat *format, + uint8_t **streaminfo_start); + +/** + * Calculate an estimate for the maximum frame size based on verbatim mode. + * @param blocksize block size, in samples + * @param ch number of channels + * @param bps bits-per-sample + */ +int ff_flac_get_max_frame_size(int blocksize, int ch, int bps); + +/** + * Validate and decode a frame header. + * @param avctx AVCodecContext to use as av_log() context + * @param gb GetBitContext from which to read frame header + * @param[out] fi frame information + * @param log_level_offset log level offset. can be used to silence error messages. + * @return non-zero on error, 0 if ok + */ +int ff_flac_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, + FLACFrameInfo *fi, int log_level_offset); + +void ff_flac_set_channel_layout(AVCodecContext *avctx); + +/** + * Parse the metadata block parameters from the header. + * @param[in] block_header header data, at least 4 bytes + * @param[out] last indicator for last metadata block + * @param[out] type metadata block type + * @param[out] size metadata block size + */ +static av_always_inline void flac_parse_block_header(const uint8_t *block_header, + int *last, int *type, int *size) +{ + int tmp = bytestream_get_byte(&block_header); + if (last) + *last = tmp & 0x80; + if (type) + *type = tmp & 0x7F; + if (size) + *size = bytestream_get_be24(&block_header); +} + +#endif /* AVCODEC_FLAC_H */ |