ALSA play.: write from thread

This is a proposed change (not yet default) to the ALSA behaviour. There
is a thread that writes to device all the time, avoiding underruns. On
the other hand there is a need to handle latency for which new buffer
was created. Alternatively, speex jitter buffer could be used.

src/host.cpp

@@ -207,3 +207,13 @@ void print_version()
         printf(AUTOCONF_RESULT);
 }
 
+const char *get_commandline_param(const char *key)
+{
+	auto it = commandline_params.find(key);
+	if (it != commandline_params.end()) {
+                return it->second.c_str();
+	} else {
+		return NULL;
+        }
+}
+