+ read_frame();\r
+ read_frame(ogl_device& ogl, size_t size, safe_ptr<host_buffer>&& image_data, audio_buffer&& audio_data);\r
+\r
+ virtual const boost::iterator_range<const uint8_t*> image_data();\r
+ virtual const boost::iterator_range<const int32_t*> audio_data();\r