void* capture_thread(void *arg)
{
size_t capt_samples_num = samplerate / 1000 * frame_length;
uint8_t *capt_buf = calloc(1, capt_samples_num * 2);
assert(capt_buf != NULL);
/* start the capture */
snd_pcm_prepare(acapt_hdl);
snd_pcm_start(acapt_hdl);
snd_pcm_reset(acapt_hdl);
while (!terminate_threads) {
/* capture, track the capture time */
struct timeval start_ts, stop_ts;
gettimeofday(&start_ts, NULL);
if (!audio_capture_read(capt_buf, capt_samples_num))
continue;
gettimeofday(&stop_ts, NULL);
uint32_t time_delta = (stop_ts.tv_sec - start_ts.tv_sec) * 1000000 +
(stop_ts.tv_usec - start_ts.tv_usec);
if (capt_min_time == 0)
capt_min_time = time_delta;
else
capt_min_time = (time_delta < capt_min_time) ?
time_delta : capt_min_time;
if (capt_max_time == 0)
capt_max_time = time_delta;
else
capt_max_time = (time_delta > capt_max_time) ?
time_delta : capt_max_time;
capt_time += time_delta;
capt_buffers++;
if (!spsc_circular_queue_push(queue, capt_buf)) {
capt_buffers_dropped++;
sched_yield();
}
}
free(capt_buf);
return NULL;
}
int main(int argc, char *argv[])
{
int rc, rdnum;
printf("APRSDUMP V1.0, Stefan Koch <*****@*****.**>\n");
if (2 != argc) {
printf("need sound device\n");
return EXIT_FAILURE;
}
audio_dev = strdup(argv[1]);
//audio_dev = strdup("plughw:0,0");
printf("- init audio capture\n");
printf(" + audio device = %s\n", audio_dev);
rc = audio_capture_init(audio_dev);
if (0 == rc) {
printf(" + init sucess\n");
} else {
printf(" + init failed (%d)\n", rc);
return EXIT_FAILURE;
}
/* register sigint handler */
printf("- register sigint handler\n");
signal(SIGINT, sig_int_handler);
/* start decoder loop */
while (1 == run) {
rdnum = audio_capture_read(&aubuf);
if (-1 == rdnum) break;
// cdump(aubuf, rdnum);
cbar(audiometer(aubuf, rdnum));
}
printf("- shutdown audio capture\n");
audio_capture_close();
return 0;
}
