[Ffmpeg-cvslog] r8480 - trunk/libavcodec/resample2.c

[michael]

Author: michael
Date: Thu Mar 22 12:10:30 2007
New Revision: 8480

Modified:
   trunk/libavcodec/resample2.c

Log:
optimize linear filter coeff interpolation code, this also makes the code less prone to overflows


Modified: trunk/libavcodec/resample2.c
==============================================================================
--- trunk/libavcodec/resample2.c	(original)
+++ trunk/libavcodec/resample2.c	Thu Mar 22 12:10:30 2007
@@ -268,13 +268,12 @@ int av_resample(AVResampleContext *c, sh
         }else if(sample_index + c->filter_length > src_size){
             break;
         }else if(c->linear){
-            int64_t v=0;
-            int sub_phase= (frac<<8) / c->src_incr;
+            FELEM2 v2=0;
             for(i=0; i<c->filter_length; i++){
-                FELEML coeff= filter[i]*(256 - sub_phase) + filter[i + c->filter_length]*sub_phase;
-                v += src[sample_index + i] * coeff;
+                val += src[sample_index + i] * (FELEM2)filter[i];
+                v2  += src[sample_index + i] * (FELEM2)filter[i + c->filter_length];
             }
-            val= v>>8;
+            val+=(v2-val)*(FELEML)frac / c->src_incr;
         }else{
             for(i=0; i<c->filter_length; i++){
                 val += src[sample_index + i] * (FELEM2)filter[i];