+static pa_usec_t source_get_latency_cb(struct pa_source *s) {
+ struct userdata *u = s->userdata;
+ snd_pcm_sframes_t frames;
+ assert(s && u && u->source);
+
+ if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
+ pa_log(__FILE__": failed to get delay\n");
+ s->get_latency = NULL;
+ return 0;
+ }
+
+ return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
+}
+
+int pa__init(struct pa_core *c, struct pa_module*m) {