libavcodec/tta.c File Reference

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

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

Go to the source code of this file.

Data Structures
struct	TTAFilter
struct	TTARice
struct	TTAChannel
struct	TTAContext
Defines
#define	ALT_BITSTREAM_READER_LE
#define	FORMAT_SIMPLE   1
#define	FORMAT_ENCRYPTED   2
#define	MAX_ORDER   16
#define	UNFOLD(x)   (((x)&1) ? (++(x)>>1) : (-(x)>>1))
#define	PRED(x, k)   (int32_t)((((uint64_t)x << k) - x) >> k)
Functions
static void	ttafilter_init (TTAFilter *c, int32_t shift, int32_t mode)
static void	memshl (register int32_t *a, register int32_t *b)
static void	ttafilter_process (TTAFilter *c, int32_t *in, int32_t mode)
static void	rice_init (TTARice *c, uint32_t k0, uint32_t k1)
static int	tta_get_unary (GetBitContext *gb)
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][2]
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.

---

Define Documentation

#define ALT_BITSTREAM_READER_LE

Definition at line 30 of file tta.c.

#define FORMAT_ENCRYPTED   2

Definition at line 37 of file tta.c.

Referenced by tta_decode_init().

#define FORMAT_SIMPLE   1

Definition at line 36 of file tta.c.

#define MAX_ORDER   16

Definition at line 39 of file tta.c.

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

Referenced by tta_decode_frame().

#define UNFOLD

(

x

)

(((x)&1) ? (++(x)>>1) : (-(x)>>1))

Referenced by tta_decode_frame().

---

Function Documentation

static void memshl	(	register int32_t *	a,
		register int32_t *	b
	)			[inline, static]

Definition at line 101 of file tta.c.

Referenced by ttafilter_process().

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

Definition at line 173 of file tta.c.

Referenced by tta_decode_frame().

static av_cold int tta_decode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 451 of file tta.c.

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

Definition at line 303 of file tta.c.

static av_cold int tta_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 201 of file tta.c.

static int tta_get_unary

(

GetBitContext *

gb

)

[static]

Definition at line 181 of file tta.c.

Referenced by tta_decode_frame().

static void ttafilter_init	(	TTAFilter *	c,
		int32_t	shift,
		int32_t	mode
	)			[static]

Definition at line 92 of file tta.c.

Referenced by tta_decode_frame().

static void ttafilter_process	(	TTAFilter *	c,
		int32_t *	in,
		int32_t	mode
	)			[inline, static]

Definition at line 114 of file tta.c.

Referenced by tta_decode_frame().

---

Variable Documentation

AVCodec ff_tta_decoder

Initial value:

 {
    .name           = "tta",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = 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("True Audio (TTA)"),
}

Definition at line 460 of file tta.c.

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 70 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 83 of file tta.c.

Referenced by rice_init(), and 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 191 of file tta.c.

Referenced by tta_decode_init().

const int32_t ttafilter_configs[4][2] [static]

Initial value:

 {
    {10, 1},
    {9, 1},
    {10, 1},
    {12, 0}
}

Definition at line 85 of file tta.c.

Referenced by tta_decode_frame().