From c3c4b07ad3259eab6afabece12186959c4e92e72 Mon Sep 17 00:00:00 2001
From: Matthew Waters <matthew@centricular.com>
Date: Thu, 6 Dec 2018 23:25:54 +1100
Subject: [PATCH] webrtc/transceiver: add a set_direction function

Matches the setDirection() from the W3C spec and allows changing the
transceiver direction at the next negotiation cycle.
---
 ext/webrtc/webrtctransceiver.c       | 10 ++++++++++
 gst-libs/gst/webrtc/rtptransceiver.c | 16 ++++++++++++++++
 gst-libs/gst/webrtc/rtptransceiver.h | 10 +++++++++-
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/ext/webrtc/webrtctransceiver.c b/ext/webrtc/webrtctransceiver.c
index c1a3faa1c2..64030acdbe 100644
--- a/ext/webrtc/webrtctransceiver.c
+++ b/ext/webrtc/webrtctransceiver.c
@@ -97,6 +97,12 @@ webrtc_transceiver_get_rtcp_dtls_transport (GstWebRTCRTPTransceiver * trans)
   return NULL;
 }
 
+static void
+webrtc_transceiver_set_direction (GstWebRTCRTPTransceiver * trans,
+    GstWebRTCRTPTransceiverDirection direction)
+{
+}
+
 static void
 webrtc_transceiver_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
@@ -172,12 +178,16 @@ webrtc_transceiver_finalize (GObject * object)
 static void
 webrtc_transceiver_class_init (WebRTCTransceiverClass * klass)
 {
+  GstWebRTCRTPTransceiverClass *trans_class =
+      (GstWebRTCRTPTransceiverClass *) klass;
   GObjectClass *gobject_class = (GObjectClass *) klass;
 
   gobject_class->get_property = webrtc_transceiver_get_property;
   gobject_class->set_property = webrtc_transceiver_set_property;
   gobject_class->finalize = webrtc_transceiver_finalize;
 
+  trans_class->set_direction = webrtc_transceiver_set_direction;
+
   /* some acrobatics are required to set the parent before _constructed()
    * has been called */
   g_object_class_install_property (gobject_class,
diff --git a/gst-libs/gst/webrtc/rtptransceiver.c b/gst-libs/gst/webrtc/rtptransceiver.c
index d0d9628d0f..332c1bd058 100644
--- a/gst-libs/gst/webrtc/rtptransceiver.c
+++ b/gst-libs/gst/webrtc/rtptransceiver.c
@@ -61,6 +61,22 @@ enum
 
 //static guint gst_webrtc_rtp_transceiver_signals[LAST_SIGNAL] = { 0 };
 
+void
+gst_webrtc_rtp_transceiver_set_direction (GstWebRTCRTPTransceiver * trans,
+    GstWebRTCRTPTransceiverDirection direction)
+{
+  GstWebRTCRTPTransceiverClass *trans_class;
+
+  GST_OBJECT_LOCK (trans);
+  trans->direction = direction;
+
+  trans_class = GST_WEBRTC_RTP_TRANSCEIVER_GET_CLASS (trans);
+
+  g_assert (trans_class->set_direction);
+  trans_class->set_direction (trans, direction);
+  GST_OBJECT_UNLOCK (trans);
+}
+
 static void
 gst_webrtc_rtp_transceiver_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
diff --git a/gst-libs/gst/webrtc/rtptransceiver.h b/gst-libs/gst/webrtc/rtptransceiver.h
index 4e5c0a5af0..78c8a6d7ee 100644
--- a/gst-libs/gst/webrtc/rtptransceiver.h
+++ b/gst-libs/gst/webrtc/rtptransceiver.h
@@ -61,13 +61,21 @@ struct _GstWebRTCRTPTransceiverClass
 {
   GstObjectClass        parent_class;
 
-  gpointer              _padding[GST_PADDING];
+  void                  (*set_direction)        (GstWebRTCRTPTransceiver * trans,
+                                                 GstWebRTCRTPTransceiverDirection direction);
+
+  /* FIXME; reset */
+  gpointer              _padding[GST_PADDING-1];
 };
 
 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstWebRTCRTPTransceiver, gst_object_unref)
 #endif
 
+GST_WEBRTC_API
+void                        gst_webrtc_rtp_transceiver_set_direction (GstWebRTCRTPTransceiver * trans,
+                                                                      GstWebRTCRTPTransceiverDirection direction);
+
 G_END_DECLS
 
 #endif /* __GST_WEBRTC_RTP_TRANSCEIVER_H__ */