osxvideosink: add force-aspect-ratio property

sys/osxvideo/cocoawindow.h

@@ -43,6 +43,7 @@ struct _GstOSXImage;
     char* data;
     int width, height;
     BOOL fullscreen;
+    BOOL keepAspectRatio;
     NSOpenGLContext* fullScreenContext; 
     NSOpenGLContext* actualContext;
     NSTrackingArea *trackingArea;
@@ -57,6 +58,7 @@ struct _GstOSXImage;
 - (void) displayTexture;
 - (char*) getTextureBuffer;
 - (void) setFullScreen: (BOOL) flag;
+- (void) setKeepAspectRatio: (BOOL) flag;
 - (void) reshape;
 - (void) setVideoSize: (int) w: (int) h;
 - (BOOL) haveSuperview;

sys/osxvideo/cocoawindow.m

@@ -142,6 +142,9 @@
 
 - (void) reshape {
   NSRect bounds;
+  gdouble frame_par, view_par;
+  gint view_height, view_width, c_height, c_width, c_x, c_y;
+
 
   GST_LOG ("reshaping");
 
@@ -152,9 +155,32 @@
   [actualContext makeCurrentContext];
 
   bounds = [self bounds];
+  view_width = bounds.size.width;
+  view_height = bounds.size.height;
 
-  glViewport (0, 0, (GLint) bounds.size.width, (GLint) bounds.size.height);
+  frame_par = (gdouble) width / height;
+  view_par = (gdouble) view_width / view_height;
+  if (!keepAspectRatio)
+    view_par = frame_par;
 
+  if (frame_par == view_par) {
+    c_height = view_height;
+    c_width = view_width;
+    c_x = 0;
+    c_y = 0;
+  } else if (frame_par < view_par) {
+    c_height = view_height;
+    c_width = c_height * frame_par;
+    c_x = (view_width - c_width) / 2;
+    c_y = 0;
+  } else {
+    c_width = view_width;
+    c_height = c_width / frame_par;
+    c_x = 0;
+    c_y = (view_height - c_height) / 2;
+  }
+
+  glViewport (c_x, c_y, (GLint) c_width, (GLint) c_height);
 }
 
 - (void) initTextures {
@@ -374,6 +400,12 @@
 
 //  data = g_malloc0 (2 * w * h);
   [self initTextures];
+  [self reshape];
+}
+
+- (void) setKeepAspectRatio: (BOOL) flag {
+  keepAspectRatio = flag;
+  [self reshape];
 }
 
 - (void) haveSuperviewReal:(NSMutableArray *)closure {

sys/osxvideo/osxvideosink.h

@@ -76,6 +76,7 @@ struct _GstOSXVideoSink {
   void *osxvideosinkobject;
   NSView *superview;
   guint cocoa_timeout;
+  gboolean keep_par;
 };
 
 struct _GstOSXVideoSinkClass {

sys/osxvideo/osxvideosink.m

@@ -66,6 +66,7 @@ enum
 {
   ARG_0,
   ARG_EMBED,
+  ARG_FORCE_PAR,
 };
 
 static void gst_osx_video_sink_osxwindow_destroy (GstOSXVideoSink * osxvideosink);
@@ -278,6 +279,7 @@ gst_osx_video_sink_osxwindow_create (GstOSXVideoSink * osxvideosink, gint width,
     }
   }
   [osxwindow->gstview setNavigation: GST_NAVIGATION(osxvideosink)];
+  [osxvideosink->osxwindow->gstview setKeepAspectRatio: osxvideosink->keep_par];
 
   [pool release];
 
@@ -446,6 +448,12 @@ gst_osx_video_sink_set_property (GObject * object, guint prop_id,
     case ARG_EMBED:
       /* Ignore, just here for backwards compatibility */
       break;
+    case ARG_FORCE_PAR:
+      osxvideosink->keep_par = g_value_get_boolean(value);
+      if (osxvideosink->osxwindow)
+        [osxvideosink->osxwindow->gstview
+            setKeepAspectRatio: osxvideosink->keep_par];
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -466,6 +474,9 @@ gst_osx_video_sink_get_property (GObject * object, guint prop_id,
     case ARG_EMBED:
       g_value_set_boolean (value, TRUE);
       break;
+    case ARG_FORCE_PAR:
+      g_value_set_boolean (value, osxvideosink->keep_par);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -481,6 +492,7 @@ gst_osx_video_sink_init (GstOSXVideoSink * osxvideosink)
   osxvideosink->osxvideosinkobject = [[GstOSXVideoSinkObject alloc]
     initWithSink:osxvideosink];
   osxvideosink->app_started = FALSE;
+  osxvideosink->keep_par = FALSE;
 }
 
 static void
@@ -543,6 +555,18 @@ gst_osx_video_sink_class_init (GstOSXVideoSinkClass * klass)
   g_object_class_install_property (gobject_class, ARG_EMBED,
       g_param_spec_boolean ("embed", "embed", "For ABI compatiblity only, do not use",
           FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GstOSXVideoSink:force-aspect-ratio
+   *
+   * When enabled, scaling will respect original aspect ratio.
+   *
+   **/
+
+  g_object_class_install_property (gobject_class, ARG_FORCE_PAR,
+      g_param_spec_boolean ("force-aspect-ratio", "force aspect ration",
+          "When enabled, scaling will respect original aspect ration",
+          FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 }
 
 static gboolean