mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 16:55:05 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* commit '50a65e7a540ce6747f81d6dbf6a602ad35be77ff': (24 commits) vmdaudio: set channel layout twinvq: validate sample rate code twinvq: set channel layout twinvq: validate that channels is not <= 0 truespeech: set channel layout sipr: set channel layout shorten: validate that the channel count in the header is not <= 0 ra288dec: set channel layout ra144dec: set channel layout qdm2: remove unneeded checks for channel count qdm2: make sure channels is not <= 0 and set channel layout qcelpdec: set channel layout nellymoserdec: set channels to 1 libopencore-amr: set channel layout for amr-nb or if not set by the user libilbc: set channel layout dpcm: use AVCodecContext.channels instead of keeping a private copy imc: set channels to 1 instead of validating it gsmdec: always set channel layout and sample rate at initialization libgsmdec: always set channel layout and sample rate at initialization g726dec: do not validate sample rate ... Conflicts: libavcodec/dpcm.c libavcodec/qdm2.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
144 lines
5.0 KiB
C
144 lines
5.0 KiB
C
/*
|
|
* 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 "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 avpriv_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 avpriv_flac_is_extradata_valid(AVCodecContext *avctx,
|
|
enum FLACExtradataFormat *format,
|
|
uint8_t **streaminfo_start);
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
void avpriv_flac_parse_block_header(const uint8_t *block_header,
|
|
int *last, int *type, int *size);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
#endif /* AVCODEC_FLAC_H */
|