[empathy] Enable echo cancellation if needed

[Guillaume Desmottes <gdesmott src gnome org>]

commit 5cf00f4b947ee9ff59abb4e0054bb54449cde916
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Mon Aug 15 12:27:22 2011 +0200

    Enable echo cancellation if needed

 libempathy-gtk/empathy-call-utils.c |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)
---
diff --git a/libempathy-gtk/empathy-call-utils.c b/libempathy-gtk/empathy-call-utils.c
index 333d902..c5e88ec 100644
--- a/libempathy-gtk/empathy-call-utils.c
+++ b/libempathy-gtk/empathy-call-utils.c
@@ -30,6 +30,7 @@
 
 #include "empathy-call-utils.h"
 
+#include <libempathy/empathy-gsettings.h>
 #include <libempathy/empathy-request-util.h>
 
 #define DEBUG_FLAG EMPATHY_DEBUG_OTHER
@@ -197,9 +198,22 @@ void
 empathy_call_set_stream_properties (GstElement *element)
 {
   GstStructure *props;
+  GSettings *gsettings_call;
+  gboolean echo_cancellation;
+  gchar *tmp;
 
-  props = gst_structure_from_string (
-      "props,media.role=phone", NULL);
+  gsettings_call = g_settings_new (EMPATHY_PREFS_CALL_SCHEMA);
+
+  echo_cancellation = g_settings_get_boolean (gsettings_call,
+      EMPATHY_PREFS_CALL_ECHO_CANCELLATION);
+
+  tmp = g_strdup_printf ("props,media.role=phone%s", echo_cancellation ?
+      ",filter.want=echo-cancel": "");
+
+  props = gst_structure_from_string (tmp, NULL);
   g_object_set (element, "stream-properties", props, NULL);
   gst_structure_free (props);
+
+  g_free (tmp);
+  g_object_unref (gsettings_call);
 }