tta.c File Reference

TTA (The Lossless True Audio) decoder. More...

#include <limits.h>
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "libavutil/crc.h"

Go to the source code of this file.

Data Structures
struct	TTAFilter
struct	TTARice
struct	TTAChannel
struct	TTAContext

Macros
#define	BITSTREAM_READER_LE
#define	FORMAT_SIMPLE   1
#define	FORMAT_ENCRYPTED   2
#define	MAX_ORDER   16
#define	PRED(x, k)   (int32_t)((((uint64_t)x << k) - x) >> k)

Functions
static void	ttafilter_init (TTAFilter *c, int32_t shift)
static void	ttafilter_process (TTAFilter *c, int32_t *in)
static void	rice_init (TTARice *c, uint32_t k0, uint32_t k1)
static int	tta_get_unary (GetBitContext *gb)
static int	tta_check_crc (TTAContext *s, const uint8_t *buf, int buf_size)
static av_cold int	tta_decode_init (AVCodecContext *avctx)
static int	tta_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
static av_cold int	tta_decode_close (AVCodecContext *avctx)

Variables
static const uint32_t	shift_1 []
static const uint32_t *const	shift_16 = shift_1 + 4
static const int32_t	ttafilter_configs [4]
static const int64_t	tta_channel_layouts [7]
AVCodec	ff_tta_decoder

Detailed Description

TTA (The Lossless True Audio) decoder.

See Also

http://www.true-audio.com/

http://tta.corecodec.org/

Author

Alex Beregszaszi

Definition in file tta.c.

Macro Definition Documentation

#define BITSTREAM_READER_LE

Definition at line 30 of file tta.c.

#define FORMAT_SIMPLE   1

Definition at line 38 of file tta.c.

#define FORMAT_ENCRYPTED   2

Definition at line 39 of file tta.c.

Referenced by tta_decode_init().

#define MAX_ORDER   16

Definition at line 41 of file tta.c.

#define PRED	(		x,
			k
	)		(int32_t)((((uint64_t)x << k) - x) >> k)

Referenced by tta_decode_frame().

Function Documentation

static void ttafilter_init ( TTAFilter *  c, int32_t  shift  )

static

Definition at line 96 of file tta.c.

Referenced by tta_decode_frame().

static void ttafilter_process ( TTAFilter *  c, int32_t *  in  )

inlinestatic

Definition at line 103 of file tta.c.

Referenced by tta_decode_frame().

static void rice_init ( TTARice *  c, uint32_t  k0, uint32_t  k1  )

static

Definition at line 134 of file tta.c.

Referenced by tta_decode_frame().

static int tta_get_unary ( GetBitContext *  gb )

static

Definition at line 142 of file tta.c.

Referenced by tta_decode_frame().

static int tta_check_crc ( TTAContext *  s, const uint8_t *  buf, int  buf_size  )

static

Definition at line 162 of file tta.c.

Referenced by tta_decode_frame(), and tta_decode_init().

static av_cold int tta_decode_init ( AVCodecContext *  avctx )

static

Definition at line 176 of file tta.c.

static int tta_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame_ptr, AVPacket *  avpkt  )

static

Definition at line 293 of file tta.c.

static av_cold int tta_decode_close ( AVCodecContext *  avctx )

static

Definition at line 457 of file tta.c.

Variable Documentation

const uint32_t shift_1[]

static

Initial value:

= {
    0x00000001, 0x00000002, 0x00000004, 0x00000008,
    0x00000010, 0x00000020, 0x00000040, 0x00000080,
    0x00000100, 0x00000200, 0x00000400, 0x00000800,
    0x00001000, 0x00002000, 0x00004000, 0x00008000,
    0x00010000, 0x00020000, 0x00040000, 0x00080000,
    0x00100000, 0x00200000, 0x00400000, 0x00800000,
    0x01000000, 0x02000000, 0x04000000, 0x08000000,
    0x10000000, 0x20000000, 0x40000000, 0x80000000,
    0x80000000, 0x80000000, 0x80000000, 0x80000000,
    0x80000000, 0x80000000, 0x80000000, 0x80000000
}

Definition at line 74 of file tta.c.

Referenced by tta_decode_frame(), and ttafilter_init().

const uint32_t* const shift_16 = shift_1 + 4

static

Definition at line 87 of file tta.c.

Referenced by rice_init(), and tta_decode_frame().

const int32_t ttafilter_configs[4]

static

Initial value:

= {
    10,
    9,
    10,
    12
}

Definition at line 89 of file tta.c.

Referenced by tta_decode_frame().

const int64_t tta_channel_layouts[7]

static

Initial value:

= {
    AV_CH_LAYOUT_STEREO,
    AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
    AV_CH_LAYOUT_QUAD,
    0,
    AV_CH_LAYOUT_5POINT1_BACK,
    AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
    AV_CH_LAYOUT_7POINT1_WIDE
}

Definition at line 152 of file tta.c.

Referenced by tta_decode_init().

AVCodec ff_tta_decoder

Initial value:

= {
    .name           = "tta",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_TTA,
    .priv_data_size = sizeof(TTAContext),
    .init           = tta_decode_init,
    .close          = tta_decode_close,
    .decode         = tta_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
}

Definition at line 468 of file tta.c.