silk.c File Reference

Opus SILK decoder. More...

#include <stdint.h>
#include "libavutil/mem.h"
#include "libavcodec/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)
#define	SILK_MAX_LAG   (288 + LTP_ORDER / 2)
	Maximum residual history according to 4.2.7.6.1.
#define	LTP_ORDER   5
	Order of the LTP filter.

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).
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 )

Value:

(((MUL64(a, b) >> ((s) - 1)) + 1) >> 1)

Definition at line 38 of file silk.c.

Referenced by silk_is_lpc_stable(), silk_lsf2lpc(), and silk_lsp2poly().

SILK_MAX_LAG

#define SILK_MAX_LAG   (288 + LTP_ORDER / 2)

Maximum residual history according to 4.2.7.6.1.

Definition at line 504 of file silk.c.

Referenced by silk_decode_frame().

LTP_ORDER

#define LTP_ORDER   5

Order of the LTP filter.

Definition at line 507 of file silk.c.

Referenced by silk_decode_frame().

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 73 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 151 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 209 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 226 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 313 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 402 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 415 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 509 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 738 of file silk.c.

Referenced by ff_silk_decode_superframe().

silk_flush_frame()

static void silk_flush_frame ( SilkFrame * frame )

static

Definition at line 768 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 786 of file silk.c.

Referenced by opus_decode_frame().

ff_silk_free()

void ff_silk_free

(

SilkContext **

ps

)

Definition at line 866 of file silk.c.

Referenced by opus_decode_close().

ff_silk_flush()

void ff_silk_flush

(

SilkContext *

s

)

Definition at line 871 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 879 of file silk.c.

Referenced by opus_decode_init().