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This commit is contained in:
Gerolf Ziegenhain 2016-10-04 16:49:43 +02:00
parent 5995b5e619
commit 592de3d5a9
1 changed files with 20 additions and 16 deletions
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36
src/beep.c
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@ -200,10 +200,11 @@ int beep_test(void)
* This extra small demo sends sinusoidal samples to your speakers.
*/
// https://www.raspberrypi.org/forums/viewtopic.php?t=84485&p=603451
static char *device = "hw:0,0"; /* playback device */
snd_output_t *output = NULL;
int beep_test(void)
{
int err;
@ -212,21 +213,7 @@ int beep_test(void)
snd_pcm_t *handle;
snd_pcm_sframes_t frames;
if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
printf("Playback open error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
if ((err = snd_pcm_set_params(handle,
SND_PCM_FORMAT_S16_LE,
SND_PCM_ACCESS_RW_INTERLEAVED,
2,
48000,
1,
500000)) < 0) { /* 0.5sec */
printf("Playback open error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
f1 = 0.02;
f2 = 0.02;
p1 = p2 = 0.0;
@ -262,6 +249,23 @@ int beep(double freq_hz, double duration_sec)
}
int beep_init()
{
int err;
if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
printf("Playback open error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
if ((err = snd_pcm_set_params(handle,
SND_PCM_FORMAT_S16_LE,
SND_PCM_ACCESS_RW_INTERLEAVED,
2,
48000,
1,
500000)) < 0) { /* 0.5sec */
printf("Playback open error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
}
int beep_close()
{