vq.h File Reference

Vector quantisation of the residual. More...

#include "entenc.h"
#include "entdec.h"
#include "modes.h"

Go to the source code of this file.

Functions
unsigned	alg_quant (celt_norm *X, int N, int K, int spread, int B, ec_enc *enc)
unsigned	alg_unquant (celt_norm *X, int N, int K, int spread, int B, ec_dec *dec, opus_val16 gain)
void	renormalise_vector (celt_norm *X, int N, opus_val16 gain, int arch)
int	stereo_itheta (const celt_norm *X, const celt_norm *Y, int stereo, int N, int arch)

Detailed Description

Vector quantisation of the residual.

Function Documentation

alg_quant()

unsigned alg_quant	(	celt_norm *	X,
		int	N,
		int	K,
		int	spread,
		int	B,
		ec_enc *	enc
	)

Algebraic pulse-vector quantiser. The signal x is replaced by the sum of the pitch and a combination of pulses such that its norm is still equal to 1. This is the function that will typically require the most CPU.

Parameters

X	Residual signal to quantise/encode (returns quantised version)
N	Number of samples to encode
K	Number of pulses to use
enc	Entropy encoder state A mask indicating which blocks in the band received pulses

alg_unquant()

unsigned alg_unquant	(	celt_norm *	X,
		int	N,
		int	K,
		int	spread,
		int	B,
		ec_dec *	dec,
		opus_val16	gain
	)

Algebraic pulse decoder

Parameters

X	Decoded normalised spectrum (returned)
N	Number of samples to decode
K	Number of pulses to use
dec	Entropy decoder state A mask indicating which blocks in the band received pulses

Decode pulse vector and combine the result with the pitch vector to produce the final normalised signal in the current band.

renormalise_vector()

void renormalise_vector	(	celt_norm *	X,
		int	N,
		opus_val16	gain,
		int	arch
	)

stereo_itheta()

int stereo_itheta	(	const celt_norm *	X,
		const celt_norm *	Y,
		int	stereo,
		int	N,
		int	arch
	)