tak.h File Reference

TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions. More...

#include <stdint.h>
#include "avcodec.h"
#include "get_bits.h"

Go to the source code of this file.

Classes
struct	TAKStreamInfo

Macros
#define	TAK_FORMAT_DATA_TYPE_BITS   3
#define	TAK_FORMAT_SAMPLE_RATE_BITS   18
#define	TAK_FORMAT_BPS_BITS   5
#define	TAK_FORMAT_CHANNEL_BITS   4
#define	TAK_FORMAT_VALID_BITS   5
#define	TAK_FORMAT_CH_LAYOUT_BITS   6
#define	TAK_SIZE_FRAME_DURATION_BITS   4
#define	TAK_SIZE_SAMPLES_NUM_BITS   35
#define	TAK_LAST_FRAME_POS_BITS   40
#define	TAK_LAST_FRAME_SIZE_BITS   24
#define	TAK_ENCODER_CODEC_BITS   6
#define	TAK_ENCODER_PROFILE_BITS   4
#define	TAK_ENCODER_VERSION_BITS   24
#define	TAK_SAMPLE_RATE_MIN   6000
#define	TAK_CHANNELS_MIN   1
#define	TAK_BPS_MIN   8
#define	TAK_FRAME_HEADER_FLAGS_BITS   3
#define	TAK_FRAME_HEADER_SYNC_ID   0xA0FF
#define	TAK_FRAME_HEADER_SYNC_ID_BITS   16
#define	TAK_FRAME_HEADER_SAMPLE_COUNT_BITS   14
#define	TAK_FRAME_HEADER_NO_BITS   21
#define	TAK_FRAME_DURATION_QUANT_SHIFT   5
#define	TAK_CRC24_BITS   24
#define	TAK_FRAME_FLAG_IS_LAST   0x1
#define	TAK_FRAME_FLAG_HAS_INFO   0x2
#define	TAK_FRAME_FLAG_HAS_METADATA   0x4
#define	TAK_MAX_CHANNELS   (1 << TAK_FORMAT_CHANNEL_BITS)
#define	TAK_MIN_FRAME_HEADER_BITS
#define	TAK_MIN_FRAME_HEADER_LAST_BITS
#define	TAK_ENCODER_BITS
#define	TAK_SIZE_BITS
#define	TAK_FORMAT_BITS
#define	TAK_STREAMINFO_BITS
#define	TAK_MAX_FRAME_HEADER_BITS
#define	TAK_STREAMINFO_BYTES   ((TAK_STREAMINFO_BITS + 7) / 8)
#define	TAK_MAX_FRAME_HEADER_BYTES   ((TAK_MAX_FRAME_HEADER_BITS + 7) / 8)
#define	TAK_MIN_FRAME_HEADER_BYTES   ((TAK_MIN_FRAME_HEADER_BITS + 7) / 8)

Typedefs
typedef struct TAKStreamInfo	TAKStreamInfo

Enumerations
enum	TAKCodecType { TAK_CODEC_MONO_STEREO = 2, TAK_CODEC_MULTICHANNEL = 4 }
enum	TAKMetaDataType {   TAK_METADATA_END = 0, TAK_METADATA_STREAMINFO, TAK_METADATA_SEEKTABLE, TAK_METADATA_SIMPLE_WAVE_DATA,   TAK_METADATA_ENCODER, TAK_METADATA_PADDING, TAK_METADATA_MD5, TAK_METADATA_LAST_FRAME }
enum	TAKFrameSizeType {   TAK_FST_94ms = 0, TAK_FST_125ms, TAK_FST_188ms, TAK_FST_250ms,   TAK_FST_4096, TAK_FST_8192, TAK_FST_16384, TAK_FST_512,   TAK_FST_1024, TAK_FST_2048 }

Functions
int	ff_tak_check_crc (const uint8_t *buf, unsigned int buf_size)
int	avpriv_tak_parse_streaminfo (TAKStreamInfo *s, const uint8_t *buf, int size)
	Parse the Streaminfo metadata block. More...
void	ff_tak_parse_streaminfo (TAKStreamInfo *s, GetBitContext *gb)
int	ff_tak_decode_frame_header (AVCodecContext *avctx, GetBitContext *gb, TAKStreamInfo *s, int log_level_offset)
	Validate and decode a frame header. More...

Detailed Description

TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions.

Macro Definition Documentation

TAK_ENCODER_BITS

#define TAK_ENCODER_BITS

Value:

(TAK_ENCODER_CODEC_BITS + \
                                        TAK_ENCODER_PROFILE_BITS)

TAK_FORMAT_BITS

#define TAK_FORMAT_BITS

Value:

(TAK_FORMAT_DATA_TYPE_BITS   + \
                                        TAK_FORMAT_SAMPLE_RATE_BITS + \
                                        TAK_FORMAT_BPS_BITS         + \
                                        TAK_FORMAT_CHANNEL_BITS + 1 + \
                                        TAK_FORMAT_VALID_BITS   + 1 + \
                                        TAK_FORMAT_CH_LAYOUT_BITS   * \
                                        TAK_MAX_CHANNELS)

TAK_MAX_FRAME_HEADER_BITS

#define TAK_MAX_FRAME_HEADER_BITS

Value:

(TAK_MIN_FRAME_HEADER_LAST_BITS + \
                                        TAK_STREAMINFO_BITS + 31)

TAK_MIN_FRAME_HEADER_BITS

#define TAK_MIN_FRAME_HEADER_BITS

Value:

(TAK_FRAME_HEADER_SYNC_ID_BITS + \
                                        TAK_FRAME_HEADER_FLAGS_BITS   + \
                                        TAK_FRAME_HEADER_NO_BITS      + \
                                        TAK_CRC24_BITS)

TAK_MIN_FRAME_HEADER_LAST_BITS

#define TAK_MIN_FRAME_HEADER_LAST_BITS

Value:

(TAK_MIN_FRAME_HEADER_BITS + 2 + \
                                        TAK_FRAME_HEADER_SAMPLE_COUNT_BITS)

TAK_SIZE_BITS

#define TAK_SIZE_BITS

Value:

(TAK_SIZE_SAMPLES_NUM_BITS + \
                                        TAK_SIZE_FRAME_DURATION_BITS)

TAK_STREAMINFO_BITS

#define TAK_STREAMINFO_BITS

Value:

(TAK_ENCODER_BITS + \
                                        TAK_SIZE_BITS    + \
                                        TAK_FORMAT_BITS)

Function Documentation

avpriv_tak_parse_streaminfo()

int avpriv_tak_parse_streaminfo	(	TAKStreamInfo *	s,
		const uint8_t *	buf,
		int	size
	)

Parse the Streaminfo metadata block.

Parameters

[out]	s	storage for parsed information
[in]	buf	input buffer
[in]	size	size of input buffer in bytes

Returns

non-zero on error, 0 if OK

ff_tak_decode_frame_header()

int ff_tak_decode_frame_header	(	AVCodecContext *	avctx,
		GetBitContext *	gb,
		TAKStreamInfo *	s,
		int	log_level_offset
	)

Validate and decode a frame header.

Parameters

	avctx	AVCodecContext to use as av_log() context
[in]	gb	GetBitContext from which to read frame header
[out]	s	frame information
	log_level_offset	log level offset, can be used to silence error messages.

Returns

non-zero on error, 0 if OK