williamp/osmocom-analog
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Generate compador table only once when the application starts

Browse Source
This commit is contained in:
Andreas Eversberg
2023-03-18 19:49:56 +01:00
parent bdecacc99e
commit 28a297f97d
8 changed files with 33 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/libcompandor/compandor.c
View File

@@ -19,6 +19,7 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "../libsample/sample.h"
@@ -39,6 +40,7 @@
#define ENVELOPE_MAX 9.990
static double sqrt_tab[10000];
static int compandor_initalized = 0;
/*
* Init compandor according to ITU-T G.162 specification
@@ -46,10 +48,24 @@ static double sqrt_tab[10000];
* Hopefully this is correct
*
*/
void init_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms)
void compandor_init(void)
{
int i;
// FIXME: make global, not at instance
for (i = 0; i < 10000; i++)
sqrt_tab[i] = sqrt(i * 0.001);
compandor_initalized = 1;
}
void setup_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms)
{
if (!compandor_initalized) {
fprintf(stderr, "Compandor nicht initialized.\n");
abort();
}
memset(state, 0, sizeof(*state));
state->c.peak = 1.0;
@@ -60,10 +76,6 @@ void init_compandor(compandor_t *state, double samplerate, double attack_ms, dou
state->c.step_down = pow(COMPRESS_RECOVERY_FACTOR, 1000.0 / recovery_ms / samplerate);
state->e.step_up = pow(EXPAND_ATTACK_FACTOR, 1000.0 / attack_ms / samplerate);
state->e.step_down = pow(EXPAND_RECOVERY_FACTOR, 1000.0 / recovery_ms / samplerate);
// FIXME: make global, not at instance
for (i = 0; i < 10000; i++)
sqrt_tab[i] = sqrt(i * 0.001);
}
void compress_audio(compandor_t *state, sample_t *samples, int num)

3
src/libcompandor/compandor.h
View File

@@ -14,7 +14,8 @@ typedef struct compandor {
} e;
} compandor_t;
void init_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms);
void compandor_init(void);
void setup_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms);
void compress_audio(compandor_t *state, sample_t *samples, int num);
void expand_audio(compandor_t *state, sample_t *samples, int num);