Data Structures | Macros | Typedefs | Functions | Variables
tta.c File Reference

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

#include <limits.h>
#include "avcodec.h"
#include "internal.h"
#include "get_bits.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 UNFOLD(x)   (((x)&1) ? (++(x)>>1) : (-(x)>>1))
#define PRED(x, k)   (int32_t)((((uint64_t)x << k) - x) >> k)

Typedefs

typedef struct TTAFilter TTAFilter
typedef struct TTARice TTARice
typedef struct TTAChannel TTAChannel
typedef struct TTAContext TTAContext

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 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][2]
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_ENCRYPTED   2

Definition at line 39 of file tta.c.

Referenced by tta_decode_init().

#define FORMAT_SIMPLE   1

Definition at line 38 of file tta.c.

#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().

#define UNFOLD (   x)    (((x)&1) ? (++(x)>>1) : (-(x)>>1))

Referenced by tta_decode_frame().

Typedef Documentation

typedef struct TTAChannel TTAChannel
typedef struct TTAContext TTAContext
typedef struct TTAFilter TTAFilter
typedef struct TTARice TTARice

Function Documentation

static void memshl ( register int32_t *  a,
register int32_t *  b 
)
inlinestatic

Definition at line 105 of file tta.c.

Referenced by ttafilter_process().

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

Definition at line 177 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 195 of file tta.c.

Referenced by tta_decode_frame(), and tta_decode_init().

static av_cold int tta_decode_close ( AVCodecContext *  avctx)
static

Definition at line 463 of file tta.c.

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

Definition at line 323 of file tta.c.

static av_cold int tta_decode_init ( AVCodecContext *  avctx)
static

Definition at line 209 of file tta.c.

static int tta_get_unary ( GetBitContext *  gb)
static

Definition at line 185 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 96 of file tta.c.

Referenced by tta_decode_frame().

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

Definition at line 118 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 472 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 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][2]
static
Initial value:
{
{10, 1},
{9, 1},
{10, 1},
{12, 0}
}

Definition at line 89 of file tta.c.

Referenced by tta_decode_frame().