gst/rtp/gstrtpilbcpay.c: Add negotiation for the ILBC mode. See #465146.

Original commit message from CVS:
Patch by: Olivier Crete <tester at tester dot ca>
* gst/rtp/gstrtpilbcpay.c: (gst_rtpilbcpay_class_init),
(gst_rtpilbcpay_sink_setcaps), (gst_rtpilbcpay_sink_getcaps):
Add negotiation for the ILBC mode. See #465146.

1 files changed, 41 insertions, 3 deletions

diff --git a/gst/rtp/gstrtpilbcpay.c b/gst/rtp/gstrtpilbcpay.c
index 5d226d68..3ac00f52 100644
--- a/gst/rtp/gstrtpilbcpay.c
+++ b/gst/rtp/gstrtpilbcpay.c
@@ -54,7 +54,10 @@ GST_STATIC_PAD_TEMPLATE ("src",
         "mode = (string) { \"20\", \"30\" }")
     );
 
-static gboolean gst_rtpilbcpay_setcaps (GstBaseRTPPayload * payload,
+
+static GstCaps *gst_rtpilbcpay_sink_getcaps (GstBaseRTPPayload * payload,
+    GstPad * pad);
+static gboolean gst_rtpilbcpay_sink_setcaps (GstBaseRTPPayload * payload,
     GstCaps * caps);
 
 GST_BOILERPLATE (GstRTPILBCPay, gst_rtpilbcpay, GstBaseRTPAudioPayload,
@@ -85,7 +88,8 @@ gst_rtpilbcpay_class_init (GstRTPILBCPayClass * klass)
 
   parent_class = g_type_class_ref (GST_TYPE_BASE_RTP_PAYLOAD);
 
-  gstbasertppayload_class->set_caps = gst_rtpilbcpay_setcaps;
+  gstbasertppayload_class->set_caps = gst_rtpilbcpay_sink_setcaps;
+  gstbasertppayload_class->get_caps = gst_rtpilbcpay_sink_getcaps;
 
   GST_DEBUG_CATEGORY_INIT (rtpilbcpay_debug, "rtpilbcpay", 0,
       "iLBC audio RTP payloader");
@@ -111,7 +115,7 @@ gst_rtpilbcpay_init (GstRTPILBCPay * rtpilbcpay, GstRTPILBCPayClass * klass)
 }
 
 static gboolean
-gst_rtpilbcpay_setcaps (GstBaseRTPPayload * basertppayload, GstCaps * caps)
+gst_rtpilbcpay_sink_setcaps (GstBaseRTPPayload * basertppayload, GstCaps * caps)
 {
   GstRTPILBCPay *rtpilbcpay;
   GstBaseRTPAudioPayload *basertpaudiopayload;
@@ -173,6 +177,40 @@ mode_changed:
   }
 }
 
+/* we return the padtemplate caps with the mode field fixated to a value if we
+ * can */
+static GstCaps *
+gst_rtpilbcpay_sink_getcaps (GstBaseRTPPayload * rtppayload, GstPad * pad)
+{
+  GstCaps *otherpadcaps;
+  GstCaps *caps;
+
+  otherpadcaps = gst_pad_get_allowed_caps (rtppayload->srcpad);
+  caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
+
+  if (otherpadcaps) {
+    if (!gst_caps_is_empty (otherpadcaps)) {
+      GstStructure *structure;
+      const gchar *mode_str;
+      gint mode;
+
+      structure = gst_caps_get_structure (otherpadcaps, 0);
+
+      /* parse mode, if we can */
+      mode_str = gst_structure_get_string (structure, "mode");
+      if (mode_str) {
+        mode = strtol (mode_str, NULL, 10);
+        if (mode == 20 || mode == 30) {
+          structure = gst_caps_get_structure (caps, 0);
+          gst_structure_set (structure, "mode", G_TYPE_INT, mode, NULL);
+        }
+      }
+    }
+    gst_caps_unref (otherpadcaps);
+  }
+  return caps;
+}
+
 gboolean
 gst_rtp_ilbc_pay_plugin_init (GstPlugin * plugin)
 {