OGLPlayer: handle json parsing error

Change-Id: I86aea12318d4e21ccadd97ad2820e31bd4580c99

avmedia/source/opengl/oglplayer.cxx

@@ -234,7 +234,15 @@ uno::Reference< media::XPlayerWindow > SAL_CALL OGLPlayer::createPlayerWindow( c
     m_pHandle->viewport.y = 0;
     m_pHandle->viewport.width = aSize.Width();
     m_pHandle->viewport.height = aSize.Height();
-    gltf_renderer_set_content(m_pHandle);
+
+    // TODO: In libgltf different return values are defined (for different errors)
+    // but these error codes are not part of the library interface
+    int nRet = gltf_renderer_set_content(m_pHandle);
+    if( nRet != 0 )
+    {
+        SAL_WARN("avmedia.opengl", "Error occured while parsing *.json file! Error code: " << nRet);
+        return uno::Reference< media::XPlayerWindow >();
+    }
     m_pOGLWindow = new OGLWindow(m_pHandle, &m_aContext, pChildWindow);
     return uno::Reference< media::XPlayerWindow >( m_pOGLWindow );
 }
@@ -254,7 +262,13 @@ uno::Reference< media::XFrameGrabber > SAL_CALL OGLPlayer::createFrameGrabber()
     m_pHandle->viewport.y = 0;
     m_pHandle->viewport.width = getPreferredPlayerWindowSize().Width;
     m_pHandle->viewport.height = getPreferredPlayerWindowSize().Height;
-    gltf_renderer_set_content(m_pHandle);
+
+    int nRet = gltf_renderer_set_content(m_pHandle);
+    if( nRet != 0 )
+    {
+        SAL_WARN("avmedia.opengl", "Error occured while parsing *.json file! Error code: " << nRet);
+        return uno::Reference< media::XFrameGrabber >();
+    }
     OGLFrameGrabber *pFrameGrabber = new OGLFrameGrabber( m_pHandle );
     return uno::Reference< media::XFrameGrabber >( pFrameGrabber );
 }