James Laird
a2fb5d219d
Perl script is removed in favour of C. Stale documentation and initfiles are removed for now also. C interface works, but still needs work (for example, mDNS is missing) - see TODO.
53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <sys/time.h>
|
|
#include "audio.h"
|
|
|
|
int Fs;
|
|
long long starttime, samples_played;
|
|
|
|
static int dummy_init(int argc, char **argv) {
|
|
return 0;
|
|
}
|
|
|
|
static void dummy_deinit(void) {
|
|
}
|
|
|
|
static void dummy_start(int sample_rate) {
|
|
Fs = sample_rate;
|
|
starttime = 0;
|
|
samples_played = 0;
|
|
printf("dummy audio output started at Fs=%d Hz\n", sample_rate);
|
|
}
|
|
|
|
static void dummy_play(short buf[], int samples) {
|
|
struct timeval tv;
|
|
|
|
// this is all a bit expensive but it's long-term stable.
|
|
gettimeofday(&tv, NULL);
|
|
|
|
long long nowtime = tv.tv_usec + 1e6*tv.tv_sec;
|
|
|
|
if (!starttime)
|
|
starttime = nowtime;
|
|
|
|
samples_played += samples;
|
|
|
|
long long finishtime = starttime + samples_played * 1e6 / Fs;
|
|
|
|
usleep(finishtime - nowtime);
|
|
}
|
|
|
|
static void dummy_stop(void) {
|
|
printf("dummy audio stopped\n");
|
|
}
|
|
|
|
audio_ops audio_dummy = {
|
|
.init = &dummy_init,
|
|
.deinit = &dummy_deinit,
|
|
.start = &dummy_start,
|
|
.stop = &dummy_stop,
|
|
.play = &dummy_play,
|
|
.volume = NULL
|
|
};
|