MJPEG Tools Svn

Get rid of unused variable compile warnings.

24 bit lpcm patch submitted by aval57 at yahoo dot com. The patch was
extended to include the 20 bit case as well.

ODML extensions courtesy of a (slightly) modified avilib.{c,h} from the
transcode project

Use "d = abs(ypre - ygte);" form instead of "if ((d = ypre - ygte) < 0) d = -d;"
form in 6 places.

Need <stdlib.h> for abs() prototype - otherwise:
motionsearch_deint.c:205: warning: implicit declaration of function 'abs'

Cleanup - malloc/free shouldn't be inside loops, allocate the memory once and
be done with it!

Small speedup by not constantly malloc'ing and free'ing arrays (simulating
auto variables).

code cleanage...

Use the provided YUV4MPEG2 ('y4m') chroma sampling names (Y4M_CHROMA_422, etc)
instead of creating a duplicate set (CHROMA422, ...).

What started out as adding interlace detection (check the 'fiel' atom) for
quicktime files turned into a general cleanup effort. No need to have
duplicate definitions for interlacing (#define LAV_INTER_TOP_FIRST Y4M_ILACE_TOP_FIRST, ...)
so replace the copies (LAV_*) with their Y4M_* equivalents.