jpegls: support color transforms

[ami_stuff]

Color Transform 1: R-=G, B-=G
Color Transform 2: B-=(R+G)/2
Color Transform 3: JPEG 2K lossless
Color Transform 4: YCbCr (not supported by IrfanView?)

Created with Photoshop + lsjpeg plug-in, decodes correctly with IrfanView?

There is also "Color Transform 5: YCbCr 211", but I'm unable to create the file (error message).

C:\>ffmpeg -i color_transform_1.jls
ffmpeg version N-36492-g7f83db3, Copyright (c) 2000-2012 the FFmpeg developers
  built on Jan  5 2012 01:57:12 with gcc 4.6.2
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
-enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
libxvid --enable-zlib
  libavutil      51. 34.100 / 51. 34.100
  libavcodec     53. 53.100 / 53. 53.100
  libavformat    53. 29.100 / 53. 29.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 57.101 /  2. 57.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  5.100 /  0.  5.100
  libpostproc    51.  2.100 / 51.  2.100
Input #0, image2, from 'color_transform_1.jls':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: jpegls, rgb24, 1023x767, 25 tbr, 25 tbn, 25 tbc
At least one output file must be specified

[ami_stuff]

this may be useful:

 http://charls.codeplex.com/releases/view/55406

enum JPEGLS_ColorXForm
{
	// default (RGB)
	COLORXFORM_NONE = 0,	

	// Color transforms as defined by HP
	COLORXFORM_HP1,
	COLORXFORM_HP2,
	COLORXFORM_HP3,

	// Defined by HP but not supported by CharLS
	COLORXFORM_RGB_AS_YUV_LOSSY,
	COLORXFORM_MATRIX
};