snd_pcm_sw_params_get_silence_threshold(swparams, &f);
info("sw silence_threshold=%lu", (unsigned long)f);
#if HAVE_SND_PCM_SW_PARAMS_GET_SLEEP_MIN
snd_pcm_sw_params_get_silence_threshold(swparams, &f);
info("sw silence_threshold=%lu", (unsigned long)f);
#if HAVE_SND_PCM_SW_PARAMS_GET_SLEEP_MIN