new frame from the camera arrived. convert and hand over
to the renderer
how to convert between YUV and RGB:http://en.wikipedia.org/wiki/YUV#Y.27UV444
Conversion in C-Code(Android Project):
http://www.netmite.com/android/mydroid/donut/development/tools/yuv420sp2rgb/yuv420sp2rgb.c
http://code.google.com/p/android/issues/detail?