opengl: add converter_cvpx
This converter can render CVPixel buffers directly by binding the IOSurface of the buffer to an OpenGL texture. This works only on Macos since IOSurface API is not allowed on iOS. This improve significantly performances when using videotoolbox. TODO: implement iOS conversion using CVOpenGLESTextureCacheCreateTextureFromImage().
Showing with 239 additions and 3 deletions