Fix preview orientation discrepancies in iOS.

This was due to a missing filter call to setup the 
preview orientation in the stream establishment.

src/videofilters/ioscapture.m

@@ -34,6 +34,8 @@
 
 #if !TARGET_IPHONE_SIMULATOR
 
+static AVCaptureVideoOrientation Angle2AVCaptureVideoOrientation(int deviceOrientation);
+
 // AVCaptureVideoPreviewLayer with AVCaptureSession creation
 @interface AVCaptureVideoPreviewLayerEx : AVCaptureVideoPreviewLayer
 

src/voip/videostream.c

@@ -240,7 +240,10 @@ static void configure_video_source(VideoStream *stream){
 
 	/* transmit orientation to source filter */
 	ms_filter_call_method(stream->source,MS_VIDEO_CAPTURE_SET_DEVICE_ORIENTATION,&stream->device_orientation);
-	
+    /* initialize the capture device orientation for preview */
+    if( ms_filter_has_method(stream->source, MS_VIDEO_DISPLAY_SET_DEVICE_ORIENTATION) )
+        ms_filter_call_method(stream->source,MS_VIDEO_DISPLAY_SET_DEVICE_ORIENTATION,&stream->device_orientation);
+
     /* transmit its preview window id if any to source filter*/
 	if (stream->preview_window_id!=0){
 		video_stream_set_native_preview_window_id(stream, stream->preview_window_id);