ff_add_hfyu_median_prediction_mmx2

overall ffvhuff decoding speedup: 28% on core2, 25% on k8.

Originally committed as revision 17059 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 18 insertions, 0 deletions

diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
index 9baa08dbda..d4d4d2d829 100644
--- a/libavcodec/dsputil.c
+++ b/libavcodec/dsputil.c
@@ -3542,6 +3542,23 @@ 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 add_hfyu_median_prediction_c(uint8_t *dst, uint8_t *src1, uint8_t *diff, int w, int *left, int *left_top){
+    int i;
+    uint8_t l, lt;
+
+    l= *left;
+    lt= *left_top;
+
+    for(i=0; i<w; i++){
+        l= mid_pred(l, src1[i], (l + src1[i] - lt)&0xFF) + diff[i];
+        lt= src1[i];
+        dst[i]= l;
+    }
+
+    *left= l;
+    *left_top= lt;
+}
+
 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;
@@ -4554,6 +4571,7 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
     c->add_bytes= add_bytes_c;
     c->add_bytes_l2= add_bytes_l2_c;
     c->diff_bytes= diff_bytes_c;
+    c->add_hfyu_median_prediction= add_hfyu_median_prediction_c;
     c->sub_hfyu_median_prediction= sub_hfyu_median_prediction_c;
     c->bswap_buf= bswap_buf;
 #if CONFIG_PNG_DECODER