ssrcdemux: emit signal when pads are removed

Add action signal to clear an SSRC in the ssrc demuxer.
Add signal to notify of removed ssrc.

See #554839

gst/rtpmanager/gstrtpbin-marshal.list

@@ -3,5 +3,6 @@ BOXED:UINT
 BOXED:UINT,UINT
 OBJECT:UINT
 VOID:UINT,OBJECT
+VOID:UINT
 VOID:UINT,UINT
 VOID:OBJECT,OBJECT

gst/rtpmanager/gstrtpssrcdemux.c

@@ -97,6 +97,8 @@ static GstElementDetails gst_rtp_ssrc_demux_details = {
 enum
 {
   SIGNAL_NEW_SSRC_PAD,
+  SIGNAL_REMOVED_SSRC_PAD,
+  SIGNAL_CLEAR_SSRC,
   LAST_SIGNAL
 };
 
@@ -112,6 +114,9 @@ static void gst_rtp_ssrc_demux_finalize (GObject * object);
 static GstStateChangeReturn gst_rtp_ssrc_demux_change_state (GstElement *
     element, GstStateChange transition);
 
+static void gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux,
+    guint32 ssrc);
+
 /* sinkpad stuff */
 static GstFlowReturn gst_rtp_ssrc_demux_chain (GstPad * pad, GstBuffer * buf);
 static gboolean gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstEvent * event);
@@ -245,9 +250,11 @@ gst_rtp_ssrc_demux_class_init (GstRtpSsrcDemuxClass * klass)
 {
   GObjectClass *gobject_klass;
   GstElementClass *gstelement_klass;
+  GstRtpSsrcDemuxClass *gstrtpssrcdemux_klass;
 
   gobject_klass = (GObjectClass *) klass;
   gstelement_klass = (GstElementClass *) klass;
+  gstrtpssrcdemux_klass = (GstRtpSsrcDemuxClass *) klass;
 
   gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_dispose);
   gobject_klass->finalize = GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_finalize);
@@ -267,8 +274,38 @@ gst_rtp_ssrc_demux_class_init (GstRtpSsrcDemuxClass * klass)
       NULL, NULL, gst_rtp_bin_marshal_VOID__UINT_OBJECT,
       G_TYPE_NONE, 2, G_TYPE_UINT, GST_TYPE_PAD);
 
+  /**
+   * GstRtpSsrcDemux::removed-ssrc-pad:
+   * @demux: the object which received the signal
+   * @ssrc: the SSRC of the pad
+   * @pad: the removed pad.
+   *
+   * Emited when a SSRC pad has been removed.
+   */
+  gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD] =
+      g_signal_new ("removed-ssrc-pad",
+      G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, removed_ssrc_pad),
+      NULL, NULL, gst_rtp_bin_marshal_VOID__UINT_OBJECT,
+      G_TYPE_NONE, 2, G_TYPE_UINT, GST_TYPE_PAD);
+
+  /**
+   * GstRtpSsrcDemux::clear-ssrc:
+   * @demux: the object which received the signal
+   * @ssrc: the SSRC of the pad
+   *
+   * Action signal to remove the pad for SSRC.
+   */
+  gst_rtp_ssrc_demux_signals[SIGNAL_CLEAR_SSRC] =
+      g_signal_new ("clear-ssrc",
+      G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+      G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, clear_ssrc),
+      NULL, NULL, gst_rtp_bin_marshal_VOID__UINT, G_TYPE_NONE, 1, G_TYPE_UINT);
+
   gstelement_klass->change_state =
       GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_change_state);
+  gstrtpssrcdemux_klass->clear_ssrc =
+      GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_clear_ssrc);
 
   GST_DEBUG_CATEGORY_INIT (gst_rtp_ssrc_demux_debug,
       "rtpssrcdemux", 0, "RTP SSRC demuxer");
@@ -342,6 +379,43 @@ gst_rtp_ssrc_demux_finalize (GObject * object)
   G_OBJECT_CLASS (parent_class)->finalize (object);
 }
 
+static void
+gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
+{
+  GstRtpSsrcDemuxPad *dpad;
+
+  GST_PAD_LOCK (demux);
+  dpad = find_demux_pad_for_ssrc (demux, ssrc);
+  if (dpad != NULL)
+    goto unknown_pad;
+
+  GST_DEBUG_OBJECT (demux, "clearing pad for SSRC %08x", ssrc);
+
+  demux->srcpads = g_slist_remove (demux->srcpads, dpad);
+  GST_PAD_UNLOCK (demux);
+
+  gst_pad_set_active (dpad->rtp_pad, FALSE);
+  gst_pad_set_active (dpad->rtcp_pad, FALSE);
+
+  g_signal_emit (G_OBJECT (demux),
+      gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD], 0, ssrc,
+      dpad->rtp_pad);
+
+  gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
+  gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
+
+  g_free (dpad);
+
+  return;
+
+  /* ERRORS */
+unknown_pad:
+  {
+    g_warning ("unknown SSRC %08x", ssrc);
+    return;
+  }
+}
+
 static gboolean
 gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstEvent * event)
 {

gst/rtpmanager/gstrtpssrcdemux.h

@@ -50,7 +50,11 @@ struct _GstRtpSsrcDemuxClass
   GstElementClass parent_class;
 
   /* signals */
-  void (*new_ssrc_pad) (GstElement *element, guint32 ssrc, GstPad *pad);
+  void (*new_ssrc_pad)     (GstRtpSsrcDemux *demux, guint32 ssrc, GstPad *pad);
+  void (*removed_ssrc_pad) (GstRtpSsrcDemux *demux, guint32 ssrc, GstPad *pad);
+
+  /* actions */
+  void (*clear_ssrc)       (GstRtpSsrcDemux *demux, guint32 ssrc);
 };
 
 GType gst_rtp_ssrc_demux_get_type (void);