silk.c File Reference

#include <stdint.h>
#include "libavutil/mem.h"
#include "mathops.h"
#include "opus.h"
#include "rc.h"
#include "silk.h"
#include "tab.h"

Go to the source code of this file.

Data Structures
struct	SilkFrame
struct	SilkContext

Macros
#define	ROUND_MULL(a, b, s)   (((MUL64(a, b) >> ((s) - 1)) + 1) >> 1)
#define	SILK_MAX_LAG   (288 + LTP_ORDER / 2)
	Maximum residual history according to 4.2.7.6.1. More...
#define	LTP_ORDER   5
	Order of the LTP filter. More...

Functions
static void	silk_stabilize_lsf (int16_t nlsf[16], int order, const uint16_t min_delta[17])
static int	silk_is_lpc_stable (const int16_t lpc[16], int order)
static void	silk_lsp2poly (const int32_t lsp[], int32_t pol[], int half_order)
static void	silk_lsf2lpc (const int16_t nlsf[16], float lpcf[16], int order)
static void	silk_decode_lpc (SilkContext *s, SilkFrame *frame, OpusRangeCoder *rc, float lpc_leadin[16], float lpc[16], int *lpc_order, int *has_lpc_leadin, int voiced)
static void	silk_count_children (OpusRangeCoder *rc, int model, int32_t total, int32_t child[2])
static void	silk_decode_excitation (SilkContext *s, OpusRangeCoder *rc, float *excitationf, int qoffset_high, int active, int voiced)
static void	silk_decode_frame (SilkContext *s, OpusRangeCoder *rc, int frame_num, int channel, int coded_channels, int active, int active1, int redundant)
static void	silk_unmix_ms (SilkContext *s, float *l, float *r)
static void	silk_flush_frame (SilkFrame *frame)
int	ff_silk_decode_superframe (SilkContext *s, OpusRangeCoder *rc, float *output[2], enum OpusBandwidth bandwidth, int coded_channels, int duration_ms)
	Decode the LP layer of one Opus frame (which may correspond to several SILK frames). More...
void	ff_silk_free (SilkContext **ps)
void	ff_silk_flush (SilkContext *s)
int	ff_silk_init (void *logctx, SilkContext **ps, int output_channels)

Detailed Description

Opus SILK decoder

Definition in file silk.c.

Macro Definition Documentation

ROUND_MULL

#define ROUND_MULL	(		a,
			b,
			s
	)		(((MUL64(a, b) >> ((s) - 1)) + 1) >> 1)

Definition at line 36 of file silk.c.

SILK_MAX_LAG

#define SILK_MAX_LAG   (288 + LTP_ORDER / 2)

Maximum residual history according to 4.2.7.6.1.

Definition at line 510 of file silk.c.

LTP_ORDER

#define LTP_ORDER   5

Order of the LTP filter.

Definition at line 513 of file silk.c.

Function Documentation

silk_stabilize_lsf()

static void silk_stabilize_lsf ( int16_t  nlsf[16], int  order, const uint16_t  min_delta[17]  )

inlinestatic

Definition at line 71 of file silk.c.

Referenced by silk_decode_lpc().

silk_is_lpc_stable()

static int silk_is_lpc_stable ( const int16_t  lpc[16], int  order  )

inlinestatic

Definition at line 149 of file silk.c.

Referenced by silk_lsf2lpc().

silk_lsp2poly()

static void silk_lsp2poly ( const int32_t  lsp[], int32_t  pol[], int  half_order  )

static

Definition at line 207 of file silk.c.

Referenced by silk_lsf2lpc().

silk_lsf2lpc()

static void silk_lsf2lpc ( const int16_t  nlsf[16], float  lpcf[16], int  order  )

static

Definition at line 224 of file silk.c.

Referenced by silk_decode_lpc().

silk_decode_lpc()

static void silk_decode_lpc ( SilkContext *  s, SilkFrame *  frame, OpusRangeCoder *  rc, float  lpc_leadin[16], float  lpc[16], int *  lpc_order, int *  has_lpc_leadin, int  voiced  )

inlinestatic

Definition at line 311 of file silk.c.

Referenced by silk_decode_frame().

silk_count_children()

static void silk_count_children ( OpusRangeCoder *  rc, int  model, int32_t  total, int32_t  child[2]  )

inlinestatic

Definition at line 408 of file silk.c.

Referenced by silk_decode_excitation().

silk_decode_excitation()

static void silk_decode_excitation ( SilkContext *  s, OpusRangeCoder *  rc, float *  excitationf, int  qoffset_high, int  active, int  voiced  )

inlinestatic

Definition at line 421 of file silk.c.

Referenced by silk_decode_frame().

silk_decode_frame()

static void silk_decode_frame ( SilkContext *  s, OpusRangeCoder *  rc, int  frame_num, int  channel, int  coded_channels, int  active, int  active1, int  redundant  )

static

Definition at line 515 of file silk.c.

Referenced by ff_silk_decode_superframe().

silk_unmix_ms()

static void silk_unmix_ms ( SilkContext *  s, float *  l, float *  r  )

static

Definition at line 744 of file silk.c.

Referenced by ff_silk_decode_superframe().

silk_flush_frame()

static void silk_flush_frame ( SilkFrame *  frame )

static

Definition at line 774 of file silk.c.

Referenced by ff_silk_decode_superframe(), and ff_silk_flush().

ff_silk_decode_superframe()

int ff_silk_decode_superframe	(	SilkContext *	s,
		OpusRangeCoder *	rc,
		float *	output[2],
		enum OpusBandwidth	bandwidth,
		int	coded_channels,
		int	duration_ms
	)

Decode the LP layer of one Opus frame (which may correspond to several SILK frames).

Definition at line 792 of file silk.c.

Referenced by opus_decode_frame().

ff_silk_free()

void ff_silk_free

(

SilkContext **

ps

)

Definition at line 870 of file silk.c.

Referenced by opus_decode_close().

ff_silk_flush()

void ff_silk_flush

(

SilkContext *

s

)

Definition at line 875 of file silk.c.

Referenced by ff_silk_init(), opus_decode_flush(), and opus_decode_frame().

ff_silk_init()

int ff_silk_init	(	void *	logctx,
		SilkContext **	ps,
		int	output_channels
	)

Definition at line 883 of file silk.c.

Referenced by opus_decode_init().