The YCbCr texture extension works now that bytes_per_pixel() returns the correct value for YUV textures. Yay! I'm still cheering for Ryan's pixel shader instead, since once it works different shaders can handle all the YUV formats.

/*
 *  prefix.h
 *  SDL Custom View App
 *
 *  Created by Darrell Walisser on Fri Jul 18 2003.
 *  Copyright (c) 2003 __MyCompanyName__. All rights reserved.
 *
 */

#include <Foundation/Foundation.h>
#include <Cocoa/Cocoa.h>