cljrdec: improve scaling somewhat

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/cljr.c

@@ -87,10 +87,10 @@ static int decode_frame(AVCodecContext *avctx,
         uint8_t *cb   = &a->picture.data[1][y * a->picture.linesize[1]];
         uint8_t *cr   = &a->picture.data[2][y * a->picture.linesize[2]];
         for (x = 0; x < avctx->width; x += 4) {
-            luma[3] = get_bits(&gb, 5) << 3;
-            luma[2] = get_bits(&gb, 5) << 3;
-            luma[1] = get_bits(&gb, 5) << 3;
-            luma[0] = get_bits(&gb, 5) << 3;
+            luma[3] = (get_bits(&gb, 5)*33) >> 2;
+            luma[2] = (get_bits(&gb, 5)*33) >> 2;
+            luma[1] = (get_bits(&gb, 5)*33) >> 2;
+            luma[0] = (get_bits(&gb, 5)*33) >> 2;
             luma += 4;
             *(cb++) = get_bits(&gb, 6) << 2;
             *(cr++) = get_bits(&gb, 6) << 2;

tests/ref/fate/cljr

-0, 0, 64800, 0x44a1c47c
-0, 3169, 64800, 0x649cc3a4
-0, 6338, 64800, 0xcab1b88c
-0, 9507, 64800, 0xf56cb788
-0, 12676, 64800, 0x5336b618
-0, 15845, 64800, 0x2704b438
-0, 19013, 64800, 0x04c7b8e4
-0, 22182, 64800, 0x3185b288
-0, 25351, 64800, 0xa537c410
-0, 28520, 64800, 0x6495c0f8
-0, 31689, 64800, 0x06a1ca14
-0, 34858, 64800, 0x69cdd2a0
-0, 38027, 64800, 0x4ad2d828
-0, 41196, 64800, 0x9604dea4
-0, 44365, 64800, 0x1c00e430
-0, 47534, 64800, 0x9afeefe0
-0, 50702, 64800, 0xc13fdd78
-0, 53871, 64800, 0x8438da7c
-0, 57040, 64800, 0xa0ead278
-0, 60209, 64800, 0xbeced2d8
-0, 63378, 64800, 0x85bbd7dc
-0, 66547, 64800, 0xbe59ce34
-0, 69716, 64800, 0xd76ecccc
-0, 72885, 64800, 0xe182b474
-0, 76054, 64800, 0x916cc394
-0, 79223, 64800, 0x7efebd14
-0, 82391, 64800, 0x8d28c9f0
-0, 85560, 64800, 0x00a1c960
-0, 88729, 64800, 0xc164c400
-0, 91898, 64800, 0xfd4dc544
-0, 95067, 64800, 0x01bfbe38
-0, 98236, 64800, 0xff11b5d0
-0, 101405, 64800, 0x4876bb20
-0, 104574, 64800, 0x756ecb04
-0, 107743, 64800, 0x3b8cd540
-0, 110912, 64800, 0x063ed444
+0, 0, 64800, 0x63132a60
+0, 3169, 64800, 0xb3c729a3
+0, 6338, 64800, 0xa27b1e0e
+0, 9507, 64800, 0xb9131d00
+0, 12676, 64800, 0xaf9a1bae
+0, 15845, 64800, 0x11e319c5
+0, 19013, 64800, 0xee6e1e6b
+0, 22182, 64800, 0x418417e9
+0, 25351, 64800, 0x339d29f4
+0, 28520, 64800, 0x198926c4
+0, 31689, 64800, 0x439a3044
+0, 34858, 64800, 0x0a4e38e1
+0, 38027, 64800, 0x6e043e7e
+0, 41196, 64800, 0xde434533
+0, 44365, 64800, 0xb58a4ad1
+0, 47534, 64800, 0xaa105710
+0, 50702, 64800, 0x1723440c
+0, 53871, 64800, 0x3b064116
+0, 57040, 64800, 0x853f38e4
+0, 60209, 64800, 0x52f53917
+0, 63378, 64800, 0xea363e5a
+0, 66547, 64800, 0x4d0a344e
+0, 69716, 64800, 0xe49232fc
+0, 72885, 64800, 0x747b1a02
+0, 76054, 64800, 0xbaa82992
+0, 79223, 64800, 0x8e9322db
+0, 82391, 64800, 0x029a2fcf
+0, 85560, 64800, 0xb9a62f6a
+0, 88729, 64800, 0x553329fe
+0, 91898, 64800, 0x9a052b5b
+0, 95067, 64800, 0xe2ff2404
+0, 98236, 64800, 0xaacd1b59
+0, 101405, 64800, 0x17d820de
+0, 104574, 64800, 0x1c9e312c
+0, 107743, 64800, 0x84df3b99
+0, 110912, 64800, 0xf7d13aa1

tests/ref/vsynth1/cljr

 041982e4fa83428c621a127647d47b3f *./tests/data/vsynth1/cljr.avi
  5075660 ./tests/data/vsynth1/cljr.avi
-f5173ae479fc104903b203260cadf507 *./tests/data/cljr.vsynth1.out.yuv
-stddev:   30.71 PSNR: 18.38 MAXDIFF:  225 bytes:  7603200/  7603200
+e1c4c96c74de3435d0f9f6118c5ed9b5 *./tests/data/cljr.vsynth1.out.yuv
+stddev:   30.53 PSNR: 18.43 MAXDIFF:  225 bytes:  7603200/  7603200

tests/ref/vsynth2/cljr

 fdc1926e0a599de94513f0a3472b598f *./tests/data/vsynth2/cljr.avi
  5075660 ./tests/data/vsynth2/cljr.avi
-3db163e55149786e7cf5499b3387bdb1 *./tests/data/cljr.vsynth2.out.yuv
-stddev:   10.80 PSNR: 27.46 MAXDIFF:   65 bytes:  7603200/  7603200
+7df03229ee6361ea11a0d83d4926cb10 *./tests/data/cljr.vsynth2.out.yuv
+stddev:   10.30 PSNR: 27.87 MAXDIFF:   65 bytes:  7603200/  7603200