test/pcm_min.c

   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
   9 snd_output_t *output = NULL;
  10 unsigned char buffer[16*1024];                          /* some random data */
  11
  12 int 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 }