Add ffvhuff encoding and decoding regression test

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

tests/codec-regression.sh

@@ -207,6 +207,11 @@ do_video_encoding ffv1.avi "-strict -2 -an -vcodec ffv1"
 do_video_decoding
 fi
 
+if [ -n "$do_ffvhuff" ] ; then
+do_video_encoding ffvhuff.avi "-an -vcodec ffvhuff"
+do_video_decoding ""
+fi
+
 if [ -n "$do_snow" ] ; then
 do_video_encoding snow.avi "-strict -2 -an -vcodec snow -qscale 2 -flags +qpel -me_method iter -dia_size 2 -cmp 12 -subcmp 12 -s 128x64"
 do_video_decoding "" "-s 352x288"

tests/ref/vsynth1/ffvhuff

+da0c0bd12ac141c976ffa6a71832ab4b *./tests/data/vsynth1/ffvhuff.avi
+ 5987208 ./tests/data/vsynth1/ffvhuff.avi
+c5ccac874dbf808e9088bc3107860042 *./tests/data/ffvhuff.vsynth1.out.yuv
+stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/  7603200

tests/ref/vsynth2/ffvhuff

+d31aab445b24f738df45fdd7479d6dd7 *./tests/data/vsynth2/ffvhuff.avi
+ 4988056 ./tests/data/vsynth2/ffvhuff.avi
+dde5895817ad9d219f79a52d0bdfb001 *./tests/data/ffvhuff.vsynth2.out.yuv
+stddev:    0.00 PSNR:999.99 MAXDIFF:    0 bytes:  7603200/  7603200