* i422_yuy2: planar 4:2:2 YUV to packed YUV conversion functions
* i422_yuy2_mmx: MMX accelerated version of i422_yuy2
* i422_yuy2_sse2: sse2 accelerated version of i422_yuy2
* i422_yuy2: planar 4:2:2 YUV to packed YUV conversion functions
* i422_yuy2_mmx: MMX accelerated version of i422_yuy2
* i422_yuy2_sse2: sse2 accelerated version of i422_yuy2