return -E_SW_PARAMS;
pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
* conf.channels_arg / 8;
+// if (snd_pcm_nonblock(pad->handle, 1))
+// PARA_ERROR_LOG("%s\n", "failed to set nonblock mode");
return period_size * pad->bytes_per_frame;
}