conf_get_long
long conf_get_long(snd_config_t *root, const char *key1, const char *key2, long def);
rate = conf_get_long(pcm_cfg, "rate", NULL, 48000);
channels = conf_get_long(pcm_cfg, "channels", NULL, 2);
period_size = conf_get_long(pcm_cfg, "period_size", NULL, 4096);
buffer_size = conf_get_long(pcm_cfg, "buffer_size", NULL, 16384);