[FFmpeg-devel] [PATCH 3/3] cljrenc: 2x2 ordered dither support.

[Michael Niedermayer]

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
---
 libavcodec/cljr.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/libavcodec/cljr.c b/libavcodec/cljr.c
index ea95901..3d35d8f 100644
--- a/libavcodec/cljr.c
+++ b/libavcodec/cljr.c
@@ -137,6 +137,11 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
     AVFrame *p = data;
     int x, y;
     uint32_t dither= avctx->frame_number;
+    static const uint32_t ordered_dither[2][2]=
+    {
+        {0x10400000, 0x104F0000},
+        {0xCB2A0000, 0xCB250000},
+    };
 
     p->pict_type = AV_PICTURE_TYPE_I;
     p->key_frame = 1;
@@ -151,6 +156,7 @@ static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
             switch(a->dither_type){
                 case 0: dither = 0x492A0000;                       break;
                 case 1: dither = dither*1664525+1013904223;        break;
+                case 2: dither = ordered_dither[y&1][(x>>2)&1];    break;
             }
             put_bits(&pb, 5, (luma[3] +  (dither>>29)   ) >> 3);
             put_bits(&pb, 5, (luma[2] + ((dither>>26)&7)) >> 3);
-- 
1.7.5.4