jack: add transport control handling

This feature allows to start and stop playback from other jack applications (e.g. qjackctl).

1 files changed, 10 insertions, 0 deletions

diff --git a/ext/jack/gstjackaudiosrc.c b/ext/jack/gstjackaudiosrc.c
index 3c3797062..a8ca1ed7d 100644
--- a/ext/jack/gstjackaudiosrc.c
+++ b/ext/jack/gstjackaudiosrc.c
@@ -211,10 +211,20 @@ jack_process_cb (jack_nframes_t nframes, void *arg)
   gint writeseg;
   gint channels, i, j, flen;
   sample_t *data;
+  GstState state;
 
   buf = GST_RING_BUFFER_CAST (arg);
   src = GST_JACK_AUDIO_SRC (GST_OBJECT_PARENT (buf));
 
+  /* handle transport state requisitions */
+  state = gst_jack_audio_client_get_transport_state (src->client);
+  if ((state != GST_STATE_VOID_PENDING) && (GST_STATE (src) != state)) {
+    GST_DEBUG_OBJECT (src, "requesting state change: %s",
+        gst_element_state_get_name (state));
+    gst_element_post_message (GST_ELEMENT (src),
+        gst_message_new_request_state (GST_OBJECT (src), state));
+  }
+
   channels = buf->spec.channels;
 
   /* get input buffers */