Kontron KTAM3874-pITX - Manual (Page 96)

KTD-S0057-I Page 92 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
/* set the stream rate */
rrate = rate;
err = snd_pcm_hw_params_set_rate_near (handle, params, &rrate, 0);
if (err < 0)
{
printf ("Rate %iHz not available for playback: %s\n", rate, snd_strerror (err));
return err;
}
if (rrate != rate)
{
printf ("Rate doesn't match (requested %iHz, get %iHz)\n", rate, err);
return -EINVAL;
}
/* set the buffer time */
err = snd_pcm_hw_params_set_buffer_time_near (handle, params, &buffer_time, &dir);
if (err < 0)
{
printf ("Unable to set buffer time %i for playback: %s\n", buffer_time, snd_strerror (err));
return err;
}
err = snd_pcm_hw_params_get_buffer_size (params, &size);
if (err < 0)
{
printf ("Unable to get buffer size for playback: %s\n", snd_strerror (err));
return err;
}
buffer_size = size;
/* set the period time */
err = snd_pcm_hw_params_set_period_time_near (handle, params, &period_time, &dir);
if (err < 0)
{
printf ("Unable to set period time %i for playback: %s\n", period_time, snd_strerror (err));
return err;
}
err = snd_pcm_hw_params_get_period_size (params, &size, &dir);
if (err < 0)
{
printf ("Unable to get period size for playback: %s\n", snd_strerror (err));
return err;
}
period_size = size;
/* write the parameters to device */
err = snd_pcm_hw_params (handle, params);
if (err < 0)
{
printf ("Unable to set hw params for playback: %s\n", snd_strerror (err));
return err;
}
return
0;
}