Avoid NullPointerException in sceMpegAvcDecodeDetail.
sceMpegRingbufferConstruct can have a NULL data pointer for Pmp video.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3601 4ab978e6-3352-0410-996c-0b42db0051c8
Complete Atrac3 java decoder. Not yet activated, need some testing.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3602 4ab978e6-3352-0410-996c-0b42db0051c8
Enabled java AT3 decoder for sceAtracLowLevelDecode

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3603 4ab978e6-3352-0410-996c-0b42db0051c8