dstdec.c File Reference

#include "libavutil/intreadwrite.h"
#include "libavutil/mem_internal.h"
#include "libavutil/reverse.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "avcodec.h"
#include "golomb.h"
#include "dsd.h"

Go to the source code of this file.

Data Structures
struct	ArithCoder
struct	Table
struct	DSTContext

Macros
#define	DST_MAX_CHANNELS   6
#define	DST_MAX_ELEMENTS   (2 * DST_MAX_CHANNELS)
#define	DSD_FS44(sample_rate)   (sample_rate * 8LL / 44100)
#define	DST_SAMPLES_PER_FRAME(sample_rate)   (588 * DSD_FS44(sample_rate))
#define	F(x)   filter[(x)][status[(x)]]

Functions
static av_cold int	decode_init (AVCodecContext *avctx)
static int	read_map (GetBitContext *gb, Table *t, unsigned int map[DST_MAX_CHANNELS], int channels)
static av_always_inline int	get_sr_golomb_dst (GetBitContext *gb, unsigned int k)
static void	read_uncoded_coeff (GetBitContext *gb, int *dst, unsigned int elements, int coeff_bits, int is_signed, int offset)
static int	read_table (GetBitContext *gb, Table *t, const int8_t code_pred_coeff[3][3], int length_bits, int coeff_bits, int is_signed, int offset)
static void	ac_init (ArithCoder *ac, GetBitContext *gb)
static av_always_inline void	ac_get (ArithCoder *ac, GetBitContext *gb, int p, int *e)
static uint8_t	prob_dst_x_bit (int c)
static int	build_filter (int16_t table[DST_MAX_ELEMENTS][16][256], const Table *fsets)
static int	decode_frame (AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)

Variables
static const int8_t	fsets_code_pred_coeff [3][3]
static const int8_t	probs_code_pred_coeff [3][3]
const FFCodec	ff_dst_decoder

Detailed Description

Direct Stream Transfer (DST) decoder ISO/IEC 14496-3 Part 3 Subpart 10: Technical description of lossless coding of oversampled audio

Definition in file dstdec.c.

Macro Definition Documentation

DST_MAX_CHANNELS

#define DST_MAX_CHANNELS   6

Definition at line 38 of file dstdec.c.

DST_MAX_ELEMENTS

#define DST_MAX_ELEMENTS   (2 * DST_MAX_CHANNELS)

Definition at line 39 of file dstdec.c.

DSD_FS44

#define DSD_FS44

(

sample_rate

)

(sample_rate * 8LL / 44100)

Definition at line 41 of file dstdec.c.

DST_SAMPLES_PER_FRAME

#define DST_SAMPLES_PER_FRAME

(

sample_rate

)

(588 * DSD_FS44(sample_rate))

Definition at line 43 of file dstdec.c.

F

#define F

(

x

)

filter[(x)][status[(x)]]

Function Documentation

decode_init()

static av_cold int decode_init ( AVCodecContext *  avctx )

static

Definition at line 79 of file dstdec.c.

read_map()

static int read_map ( GetBitContext *  gb, Table *  t, unsigned int  map[DST_MAX_CHANNELS], int  channels  )

static

Definition at line 109 of file dstdec.c.

Referenced by decode_frame().

get_sr_golomb_dst()

static av_always_inline int get_sr_golomb_dst ( GetBitContext *  gb, unsigned int  k  )

static

Definition at line 132 of file dstdec.c.

Referenced by read_table().

read_uncoded_coeff()

static void read_uncoded_coeff ( GetBitContext *  gb, int *  dst, unsigned int  elements, int  coeff_bits, int  is_signed, int  offset  )

static

Definition at line 140 of file dstdec.c.

Referenced by read_table().

read_table()

static int read_table ( GetBitContext *  gb, Table *  t, const int8_t  code_pred_coeff[3][3], int  length_bits, int  coeff_bits, int  is_signed, int  offset  )

static

Definition at line 150 of file dstdec.c.

Referenced by decode_frame().

ac_init()

static void ac_init ( ArithCoder *  ac, GetBitContext *  gb  )

static

Definition at line 186 of file dstdec.c.

Referenced by decode_frame().

ac_get()

static av_always_inline void ac_get ( ArithCoder *  ac, GetBitContext *  gb, int  p, int *  e  )

static

Definition at line 192 of file dstdec.c.

Referenced by decode_frame().

prob_dst_x_bit()

static uint8_t prob_dst_x_bit ( int  c )

static

Definition at line 213 of file dstdec.c.

Referenced by decode_frame().

build_filter()

static int build_filter ( int16_t  table[DST_MAX_ELEMENTS][16][256], const Table *  fsets  )

static

Definition at line 218 of file dstdec.c.

Referenced by decode_frame().

decode_frame()

static int decode_frame ( AVCodecContext *  avctx, AVFrame *  frame, int *  got_frame_ptr, AVPacket *  avpkt  )

static

Definition at line 242 of file dstdec.c.

Variable Documentation

fsets_code_pred_coeff

const int8_t fsets_code_pred_coeff[3][3]

static

Initial value:

= {
    {  -8 },
    { -16,  8 },
    {  -9, -5, 6 },
}

Definition at line 45 of file dstdec.c.

Referenced by decode_frame().

probs_code_pred_coeff

const int8_t probs_code_pred_coeff[3][3]

static

Initial value:

= {
    {  -8 },
    { -16,  8 },
    { -24, 24, -8 },
}

Definition at line 51 of file dstdec.c.

Referenced by decode_frame().

ff_dst_decoder

const FFCodec ff_dst_decoder

Initial value:

= {
    .p.name         = "dst",
    CODEC_LONG_NAME("DST (Digital Stream Transfer)"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_DST,
    .priv_data_size = sizeof(DSTContext),
    .init           = decode_init,
    FF_CODEC_DECODE_CB(decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLT),
}

Definition at line 386 of file dstdec.c.