mmx2 optimization of huffyuv median encoding

Originally committed as revision 2372 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 19 insertions, 0 deletions

diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index 9e7cca734f..270424706a 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -2526,6 +2526,24 @@ static void diff_bytes_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){
         dst[i+0] = src1[i+0]-src2[i+0];
 }
 
+static void sub_hfyu_median_prediction_c(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w, int *left, int *left_top){
+    int i;
+    uint8_t l, lt;
+
+    l= *left;
+    lt= *left_top;
+
+    for(i=0; i<w; i++){
+        const int pred= mid_pred(l, src1[i], (l + src1[i] - lt)&0xFF);
+        lt= src1[i];
+        l= src2[i];
+        dst[i]= l - pred;
+    }    
+
+    *left= l;
+    *left_top= lt;
+}
+
 #define BUTTERFLY2(o1,o2,i1,i2) \
 o1= (i1)+(i2);\
 o2= (i1)-(i2);
@@ -3007,6 +3025,7 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
         
     c->add_bytes= add_bytes_c;
     c->diff_bytes= diff_bytes_c;
+    c->sub_hfyu_median_prediction= sub_hfyu_median_prediction_c;
     c->bswap_buf= bswap_buf;
 
 #ifdef HAVE_MMX