1/* 2 * This extra small demo sends a random samples to your speakers. 3 */ 4 5#include "../include/asoundlib.h" 6 7static char *device = "default"; /* playback device */ 8unsigned char buffer[16*1024]; /* some random data */ 9 10int 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