camerabin2: Flush downstream after setting src to READY

v4l2src requires all buffers to come back in order to cleanly stop
streaming. Flushing the pipline should force all buffers to come
back.

https://bugzilla.gnome.org/show_bug.cgi?id=732741

diff --git a/gst/camerabin2/gstwrappercamerabinsrc.c b/gst/camerabin2/gstwrappercamerabinsrc.c
index c2111a0b7e5b47791dcd2bf35fb015170a84fce5..48ec28f23a9a419fec5014f5bc7586d375f6f97b 100644 (file)
--- a/gst/camerabin2/gstwrappercamerabinsrc.c
+++ b/gst/camerabin2/gstwrappercamerabinsrc.c
@@ -826,10 +826,22 @@ start_image_capture (GstWrapperCameraBinSrc * self)
       GST_TYPE_PHOTOGRAPHY);
   gboolean ret = FALSE;
   GstCaps *caps;
+  GstPad *pad, *peer;
 
   GST_DEBUG_OBJECT (self, "Starting image capture");
   gst_element_set_state (self->src_vid_src, GST_STATE_READY);
 
+  /* FIXME - V4L2 source will not close the device until all buffers have came
+   * back. Flushing the pipeline, will ensure it's properly closed, and that
+   * setting it back to PLAYING will work. This is more a workaround then a
+   * solution to buffer reclaiming. */
+  pad = gst_element_get_static_pad (self->src_vid_src, "src");
+  peer = gst_pad_get_peer (pad);
+  gst_object_unref (pad);
+  gst_pad_send_event (peer, gst_event_new_flush_start ());
+  gst_pad_send_event (peer, gst_event_new_flush_stop (TRUE));
+  gst_object_unref (peer);
+
   if (self->image_renegotiate) {
     /* clean capsfilter caps so they don't interfere here */
     g_object_set (self->src_filter, "caps", NULL, NULL);