g723_1.c File Reference

#include <stdint.h>
#include "libavutil/common.h"
#include "acelp_vectors.h"
#include "avcodec.h"
#include "celp_math.h"
#include "g723_1.h"

Go to the source code of this file.

Functions
int	ff_g723_1_scale_vector (int16_t *dst, const int16_t *vector, int length)
	Scale vector contents based on the largest of their absolutes. More...
int	ff_g723_1_normalize_bits (int num, int width)
	Calculate the number of left-shifts required for normalizing the input. More...
int	ff_g723_1_dot_product (const int16_t *a, const int16_t *b, int length)
void	ff_g723_1_get_residual (int16_t *residual, int16_t *prev_excitation, int lag)
	Get delayed contribution from the previous excitation vector. More...
void	ff_g723_1_gen_dirac_train (int16_t *buf, int pitch_lag)
	Generate a train of dirac functions with period as pitch lag. More...
void	ff_g723_1_gen_acb_excitation (int16_t *vector, int16_t *prev_excitation, int pitch_lag, G723_1_Subframe *subfrm, enum Rate cur_rate)
	Generate adaptive codebook excitation. More...
static void	lsp2lpc (int16_t *lpc)
	Convert LSP frequencies to LPC coefficients. More...
void	ff_g723_1_lsp_interpolate (int16_t *lpc, int16_t *cur_lsp, int16_t *prev_lsp)
	Quantize LSP frequencies by interpolation and convert them to the corresponding LPC coefficients. More...
void	ff_g723_1_inverse_quant (int16_t *cur_lsp, int16_t *prev_lsp, uint8_t *lsp_index, int bad_frame)
	Perform inverse quantization of LSP frequencies. More...

Function Documentation

ff_g723_1_scale_vector()

int ff_g723_1_scale_vector	(	int16_t *	dst,
		const int16_t *	vector,
		int	length
	)

Scale vector contents based on the largest of their absolutes.

Definition at line 32 of file g723_1.c.

Referenced by comp_autocorr(), comp_interp_index(), formant_postfilter(), and g723_1_encode_frame().

ff_g723_1_normalize_bits()

int ff_g723_1_normalize_bits	(	int	num,
		int	width
	)

Calculate the number of left-shifts required for normalizing the input.

Parameters

num	input number
width	width of the input, 16 bits(0) / 32 bits(1)

Definition at line 49 of file g723_1.c.

Referenced by acb_search(), comp_autocorr(), comp_harmonic_coeff(), comp_ppf_coeff(), estimate_pitch(), gain_scale(), get_fcb_param(), lpc2lsp(), and lsp_quantize().

ff_g723_1_dot_product()

int ff_g723_1_dot_product	(	const int16_t *	a,
		const int16_t *	b,
		int	length
	)

Definition at line 54 of file g723_1.c.

Referenced by acb_search(), autocorr_max(), comp_interp_index(), comp_ppf_coeff(), formant_postfilter(), and get_fcb_param().

ff_g723_1_get_residual()

void ff_g723_1_get_residual	(	int16_t *	residual,
		int16_t *	prev_excitation,
		int	lag
	)

Get delayed contribution from the previous excitation vector.

Definition at line 60 of file g723_1.c.

Referenced by acb_search(), and ff_g723_1_gen_acb_excitation().

ff_g723_1_gen_dirac_train()

void ff_g723_1_gen_dirac_train	(	int16_t *	buf,
		int	pitch_lag
	)

Generate a train of dirac functions with period as pitch lag.

Definition at line 74 of file g723_1.c.

Referenced by fcb_search(), gen_fcb_excitation(), and get_fcb_param().

ff_g723_1_gen_acb_excitation()

void ff_g723_1_gen_acb_excitation	(	int16_t *	vector,
		int16_t *	prev_excitation,
		int	pitch_lag,
		G723_1_Subframe *	subfrm,
		enum Rate	cur_rate
	)

Generate adaptive codebook excitation.

Definition at line 86 of file g723_1.c.

Referenced by g723_1_decode_frame(), g723_1_encode_frame(), and generate_noise().

lsp2lpc()

static void lsp2lpc ( int16_t *  lpc )

static

Convert LSP frequencies to LPC coefficients.

Parameters

lpc	buffer for LPC coefficients

Definition at line 118 of file g723_1.c.

Referenced by ff_g723_1_lsp_interpolate().

ff_g723_1_lsp_interpolate()

void ff_g723_1_lsp_interpolate	(	int16_t *	lpc,
		int16_t *	cur_lsp,
		int16_t *	prev_lsp
	)

Quantize LSP frequencies by interpolation and convert them to the corresponding LPC coefficients.

Parameters

lpc	buffer for LPC coefficients
cur_lsp	the current LSP vector
prev_lsp	the previous LSP vector

Definition at line 180 of file g723_1.c.

Referenced by g723_1_decode_frame(), and g723_1_encode_frame().

ff_g723_1_inverse_quant()

void ff_g723_1_inverse_quant	(	int16_t *	cur_lsp,
		int16_t *	prev_lsp,
		uint8_t *	lsp_index,
		int	bad_frame
	)

Perform inverse quantization of LSP frequencies.

Parameters

cur_lsp	the current LSP vector
prev_lsp	the previous LSP vector
lsp_index	VQ indices
bad_frame	bad frame flag

Definition at line 201 of file g723_1.c.

Referenced by g723_1_decode_frame(), and g723_1_encode_frame().