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/*
Copyright Jeroen Vreeken (jeroen@vreeken.net), 2019
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "alaw.h"
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
uint8_t *alaw_beep(double freq, double rate, double length)
{
int samples = length * rate;
uint8_t *buffer = malloc(samples);
int16_t raw[samples];
int i;
if (!buffer)
return NULL;
for (i = 0; i < samples; i++) {
raw[i] = 16384 * sin(i * M_PI * 2 * freq / rate);
}
alaw_encode(buffer, raw, samples);
return buffer;
}
uint8_t *alaw_silence(double rate, double length)
{
int samples = length * rate;
uint8_t *buffer = malloc(samples);
int16_t raw[samples];
int i;
if (!buffer)
return NULL;
for (i = 0; i < samples; i++) {
raw[i] = 0;
}
alaw_encode(buffer, raw, samples);
return buffer;
}