ret = snd_pcm_writei(pad->handle, data, frames);
if (ret == -EPIPE) {
PARA_WARNING_LOG("%s", "EPIPE\n");
snd_pcm_prepare(pad->handle);
ret = snd_pcm_writei(pad->handle, data, frames);
if (ret == -EPIPE) {
PARA_WARNING_LOG("%s", "EPIPE\n");
snd_pcm_prepare(pad->handle);