dstdec.c File Reference

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

#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)
#define	DST_SAMPLES_PER_FRAME(sample_rate)
#define	F(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.

Referenced by decode_frame(), decode_init(), and read_map().

DST_MAX_ELEMENTS

#define DST_MAX_ELEMENTS   (2 * DST_MAX_CHANNELS)

Definition at line 39 of file dstdec.c.

Referenced by build_filter(), and read_map().

DSD_FS44

#define DSD_FS44

(

sample_rate

)

Value:

(sample_rate * 8LL / 44100)

Definition at line 41 of file dstdec.c.

DST_SAMPLES_PER_FRAME

#define DST_SAMPLES_PER_FRAME

(

sample_rate

)

Value:

(588 * DSD_FS44(sample_rate))

Definition at line 43 of file dstdec.c.

Referenced by decode_frame(), and decode_init().

F

#define F

(

x

)

Value:

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

Referenced by av_camellia_init(), camellia_decrypt(), camellia_encrypt(), check_loopfilter(), create_cb_handler(), decode_frame(), epx2_slice(), epx3_slice(), FFTypedCBHandler< Iface, F, Args >::FFTypedCBHandler(), idct(), idct10(), idct_msa(), loop_filter(), main(), main(), randomize_loopfilter_buffers(), run_on_wgc_thread(), and run_psnr().

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,
}

Definition at line 386 of file dstdec.c.