g723_1.h File Reference

G.723.1 types, functions and data tables. More...

#include <stdint.h>
#include "libavutil/log.h"

Go to the source code of this file.

Classes
struct	G723_1_Subframe
	G723.1 unpacked data subframe. More...
struct	PPFParam
	Pitch postfilter parameters. More...
struct	HFParam
	Harmonic filter parameters. More...
struct	FCBParam
	Optimized fixed codebook excitation parameters. More...
struct	g723_1_context

Macros
#define	SUBFRAMES   4
#define	SUBFRAME_LEN   60
#define	FRAME_LEN   (SUBFRAME_LEN << 2)
#define	HALF_FRAME_LEN   (FRAME_LEN / 2)
#define	LPC_FRAME   (HALF_FRAME_LEN + SUBFRAME_LEN)
#define	LPC_ORDER   10
#define	LSP_BANDS   3
#define	LSP_CB_SIZE   256
#define	PITCH_MIN   18
#define	PITCH_MAX   (PITCH_MIN + 127)
#define	PITCH_ORDER   5
#define	GRID_SIZE   2
#define	PULSE_MAX   6
#define	GAIN_LEVELS   24
#define	COS_TBL_SIZE   512
#define	MULL2(a, b)   ((((a) >> 16) * (b) * 2) + (((a) & 0xffff) * (b) >> 15))
	Bitexact implementation of 2ab scaled by 1/2^16. More...

Typedefs
typedef struct G723_1_Subframe	G723_1_Subframe
	G723.1 unpacked data subframe.
typedef struct PPFParam	PPFParam
	Pitch postfilter parameters.
typedef struct HFParam	HFParam
	Harmonic filter parameters.
typedef struct FCBParam	FCBParam
	Optimized fixed codebook excitation parameters.
typedef struct g723_1_context	G723_1_Context

Enumerations
enum	FrameType {   ACTIVE_FRAME, SID_FRAME, UNTRANSMITTED_FRAME, INTRA_FRAME = 0,   INTER_FRAME, SKIP_FRAME, FIRST_FRAME, INNER_FRAME,   FINAL_FRAME, LINEAR_MODE, FRAME_NB }
	G723.1 frame types. More...
enum	Rate { RATE_6300, RATE_5300 }
	G723.1 rate values.

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.
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.
void	ff_g723_1_gen_dirac_train (int16_t *buf, int pitch_lag)
	Generate a train of dirac functions with period as pitch lag.
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.
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...

Detailed Description

G.723.1 types, functions and data tables.

Macro Definition Documentation

MULL2

#define MULL2	(		a,
			b
	)		((((a) >> 16) * (b) * 2) + (((a) & 0xffff) * (b) >> 15))

Bitexact implementation of 2ab scaled by 1/2^16.

Parameters

a	32 bit multiplicand
b	16 bit multiplier

Enumeration Type Documentation

FrameType

enum FrameType

G723.1 frame types.

Enumerator
ACTIVE_FRAME	Active speech.
SID_FRAME	Silence Insertion Descriptor frame.

Function Documentation

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

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

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)