Created
January 25, 2011 00:48
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ALSA Easier Demo (Random Samples)
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/* | |
* This extra small demo sends a random samples to your speakers. | |
*/ | |
#include "alsa/asoundlib.h" | |
static char *device = "default"; /* playback device */ | |
snd_output_t *output = NULL; | |
unsigned char buffer[16*1024]; /* some random data */ | |
int main(void) | |
{ | |
int err; | |
unsigned int i; | |
snd_pcm_t *handle; | |
snd_pcm_sframes_t frames; | |
for (i = 0; i < sizeof(buffer); i++) | |
buffer[i] = random() & 0xff; | |
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_U8, SND_PCM_ACCESS_RW_INTERLEAVED, 1, 48000, 1, 500000)) < 0) { /* 0.5sec */ | |
printf("Playback open error: %s\n", snd_strerror(err)); | |
exit(EXIT_FAILURE); | |
} | |
for (i = 0; i < 16; i++) { | |
frames = snd_pcm_writei(handle, buffer, sizeof(buffer)); | |
if (frames < 0) | |
frames = snd_pcm_recover(handle, frames, 0); | |
if (frames < 0) { | |
printf("snd_pcm_writei failed: %s\n", snd_strerror(err)); | |
break; | |
} | |
if (frames > 0 && frames < (long)sizeof(buffer)) | |
printf("Short write (expected %li, wrote %li)\n", (long)sizeof(buffer), frames); | |
} | |
snd_pcm_close(handle); | |
return 0; | |
} |
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