* i420_rgb: planar YUV to packed RGB conversion functions
* i420_rgb_mmx: MMX accelerated version of i420_rgb
* i420_rgb_sse2: sse2 accelerated version of i420_rgb
* i420_yuy2: planar 4:2:0 YUV to packed YUV conversion functions
* i420_yuy2_altivec: AltiVec accelerated version of i420_yuy2
* i420_yuy2_mmx: MMX accelerated version of i420_yuy2
* i420_rgb: planar YUV to packed RGB conversion functions
* i420_rgb_mmx: MMX accelerated version of i420_rgb
* i420_rgb_sse2: sse2 accelerated version of i420_rgb
* i420_yuy2: planar 4:2:0 YUV to packed YUV conversion functions
* i420_yuy2_altivec: AltiVec accelerated version of i420_yuy2
* i420_yuy2_mmx: MMX accelerated version of i420_yuy2