1 /*
2 * This extra small demo sends a random samples to your speakers.
3 */
4
5 #include "../include/asoundlib.h"
6
7 static char *device = "default"; /* playback device */
8 unsigned char buffer[16*1024]; /* some random data */
9
main(void)10 int main(void)
11 {
12 int err;
13 unsigned int i;
14 snd_pcm_t *handle;
15 snd_pcm_sframes_t frames;
16
17 for (i = 0; i < sizeof(buffer); i++)
18 buffer[i] = random() & 0xff;
19
20 if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
21 printf("Playback open error: %s\n", snd_strerror(err));
22 exit(EXIT_FAILURE);
23 }
24 if ((err = snd_pcm_set_params(handle,
25 SND_PCM_FORMAT_U8,
26 SND_PCM_ACCESS_RW_INTERLEAVED,
27 1,
28 48000,
29 1,
30 500000)) < 0) { /* 0.5sec */
31 printf("Playback open error: %s\n", snd_strerror(err));
32 exit(EXIT_FAILURE);
33 }
34
35 for (i = 0; i < 16; i++) {
36 frames = snd_pcm_writei(handle, buffer, sizeof(buffer));
37 if (frames < 0)
38 frames = snd_pcm_recover(handle, frames, 0);
39 if (frames < 0) {
40 printf("snd_pcm_writei failed: %s\n", snd_strerror(frames));
41 break;
42 }
43 if (frames > 0 && frames < (long)sizeof(buffer))
44 printf("Short write (expected %li, wrote %li)\n", (long)sizeof(buffer), frames);
45 }
46
47 /* pass the remaining samples, otherwise they're dropped in close */
48 err = snd_pcm_drain(handle);
49 if (err < 0)
50 printf("snd_pcm_drain failed: %s\n", snd_strerror(err));
51 snd_pcm_close(handle);
52 return 0;
53 }
54