Implement Adapter.Peek() that returns a GstBuffer

gstreamer-sharp/Adapter.custom

@@ -5,3 +5,10 @@
 			gst_adapter_push(Handle, buf == null ? IntPtr.Zero : buf.OwnedHandle);
 		}
 
+
+		[DllImport ("gstreamersharpglue-0.10.dll") ]
+		static extern IntPtr gstsharp_gst_adapter_peek_buffer (IntPtr adapter, uint size);
+
+		public Gst.Buffer Peek (uint size) {
+		  return (Gst.Buffer) Gst.MiniObject.GetObject (gstsharp_gst_adapter_peek_buffer (Handle, size), true);			
+		}

gstreamer-sharp/glue/Makefile.am

@@ -17,7 +17,8 @@ libgstreamersharpglue_0_10_la_SOURCES =	\
 	indexentry.c \
 	indexfactory.c \
 	mixertrack.c \
-	tunernorm.c
+	tunernorm.c \
+	adapter.c
 
 nodist_libgstreamersharpglue_0_10_la_SOURCES = generated.c 
 

gstreamer-sharp/glue/adapter.c

@@ -0,0 +1,13 @@
+#include <gst/gst.h>
+#include <gst/base/gstadapter.h>
+
+GstBuffer *
+gstsharp_gst_adapter_peek_buffer (GstAdapter *adapter, guint size) {
+  GstBuffer *ret = gst_buffer_new_and_try_alloc (size);
+
+  if (ret == NULL)
+    return NULL;
+
+  gst_adapter_copy (adapter, GST_BUFFER_DATA (ret), 0, size);
+  return ret;
+}