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 */ 8 9snd_output_t *output = NULL; 10unsigned char buffer[16*1024]; /* some random data */ 11 12int main(void) 13{ 14 int err; 15 unsigned int i; 16 snd_pcm_t *handle; 17 snd_pcm_sframes_t frames; 18 19 for (i = 0; i < sizeof(buffer); i++) 20 buffer[i] = random() & 0xff; 21 22 if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) { 23 printf("Playback open error: %s\n", snd_strerror(err)); 24 exit(EXIT_FAILURE); 25 } 26 if ((err = snd_pcm_set_params(handle, 27 SND_PCM_FORMAT_U8, 28 SND_PCM_ACCESS_RW_INTERLEAVED, 29 1, 30 48000, 31 1, 32 500000)) < 0) { /* 0.5sec */ 33 printf("Playback open error: %s\n", snd_strerror(err)); 34 exit(EXIT_FAILURE); 35 } 36 37 for (i = 0; i < 16; i++) { 38 frames = snd_pcm_writei(handle, buffer, sizeof(buffer)); 39 if (frames < 0) 40 frames = snd_pcm_recover(handle, frames, 0); 41 if (frames < 0) { 42 printf("snd_pcm_writei failed: %s\n", snd_strerror(err)); 43 break; 44 } 45 if (frames > 0 && frames < (long)sizeof(buffer)) 46 printf("Short write (expected %li, wrote %li)\n", (long)sizeof(buffer), frames); 47 } 48 49 snd_pcm_close(handle); 50 return 0; 51} 52