celp_math.c File Reference

#include <stdint.h>
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/intmath.h"
#include "mathops.h"
#include "celp_math.h"

Go to the source code of this file.

Functions
int	ff_log2_q15 (uint32_t value)
	Calculate log2(x). More...
int64_t	ff_dot_product (const int16_t *a, const int16_t *b, int length)
	Calculate the dot product of 2 int16_t vectors. More...
float	ff_dot_productf (const float *a, const float *b, int length)
	Return the dot product. More...
void	ff_celp_math_init (CELPMContext *c)
	Initialize CELPMContext. More...

Variables
static const uint16_t	tab_log2 [33]
	Table used to compute log2(x) More...

Function Documentation

ff_log2_q15()

int ff_log2_q15

(

uint32_t

value

)

Calculate log2(x).

Parameters

value

function argument, 0 < value <= 7fff ffff

Returns

value of (1<<15) * log2(value)

Definition at line 79 of file celp_math.c.

Referenced by ff_acelp_update_past_gain(), and main().

ff_dot_product()

int64_t ff_dot_product	(	const int16_t *	a,
		const int16_t *	b,
		int	length
	)

Calculate the dot product of 2 int16_t vectors.

Parameters

a	input data array
b	input data array
length	number of elements

Returns

dot product = sum of elementwise products

Definition at line 99 of file celp_math.c.

Referenced by acb_search(), comp_autocorr(), comp_harmonic_coeff(), estimate_pitch(), ff_g723_1_dot_product(), ff_g723_1_gen_acb_excitation(), and main().

ff_dot_productf()

float ff_dot_productf	(	const float *	a,
		const float *	b,
		int	length
	)

Return the dot product.

Parameters

a	input data array
b	input data array
length	number of elements

Returns

dot product = sum of elementwise products

Definition at line 110 of file celp_math.c.

Referenced by ff_celp_math_init(), and main().

ff_celp_math_init()

void ff_celp_math_init

(

CELPMContext *

c

)

Initialize CELPMContext.

Definition at line 121 of file celp_math.c.

Referenced by amrnb_decode_init(), and amrwb_decode_init().

Variable Documentation

tab_log2

const uint16_t tab_log2[33]

static

Initial value:

=
{
 
 
 
 
 
 
      4,   1459,   2870,   4240,   5572,   6867,   8127,   9355,
  10552,  11719,  12858,  13971,  15057,  16120,  17158,  18175,
  19170,  20145,  21100,  22036,  22954,  23854,  24738,  25605,
  26457,  27294,  28116,  28924,  29719,  30500,  31269,  32025,  32769,
 
}

Table used to compute log2(x)

tab_log2[i] = (1<<15) * log2(1 + i/32), i=0..32

Definition at line 64 of file celp_math.c.

Referenced by ff_log2_q15().