diff --git a/libavcodec/snow.c b/libavcodec/snow.c
index aa15fccc42..85ad6d10a1 100644
--- a/libavcodec/snow.c
+++ b/libavcodec/snow.c
@@ -29,39 +29,6 @@
 #include "snowdata.h"
 
 
-void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride, uint8_t * * block, int b_w, int b_h,
-                              int src_x, int src_y, int src_stride, slice_buffer * sb, int add, uint8_t * dst8){
-    int y, x;
-    IDWTELEM * dst;
-    for(y=0; y<b_h; y++){
-        //FIXME ugly misuse of obmc_stride
-        const uint8_t *obmc1= obmc + y*obmc_stride;
-        const uint8_t *obmc2= obmc1+ (obmc_stride>>1);
-        const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1);
-        const uint8_t *obmc4= obmc3+ (obmc_stride>>1);
-        dst = slice_buffer_get_line(sb, src_y + y);
-        for(x=0; x<b_w; x++){
-            int v=   obmc1[x] * block[3][x + y*src_stride]
-                    +obmc2[x] * block[2][x + y*src_stride]
-                    +obmc3[x] * block[1][x + y*src_stride]
-                    +obmc4[x] * block[0][x + y*src_stride];
-
-            v <<= 8 - LOG2_OBMC_MAX;
-            if(FRAC_BITS != 8){
-                v >>= 8 - FRAC_BITS;
-            }
-            if(add){
-                v += dst[x + src_x];
-                v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS;
-                if(v&(~255)) v= ~(v>>31);
-                dst8[x + y*src_stride] = v;
-            }else{
-                dst[x + src_x] -= v;
-            }
-        }
-    }
-}
-
 int ff_snow_get_buffer(SnowContext *s, AVFrame *frame)
 {
     int ret, i;
diff --git a/libavcodec/snow.h b/libavcodec/snow.h
index ed0f9abb42..1c976b9ba7 100644
--- a/libavcodec/snow.h
+++ b/libavcodec/snow.h
@@ -45,11 +45,8 @@
 #define QSHIFT 5
 #define QROOT (1<<QSHIFT)
 #define LOSSLESS_QLOG -128
-#define FRAC_BITS 4
 #define MAX_REF_FRAMES 8
 
-#define LOG2_OBMC_MAX 8
-#define OBMC_MAX (1<<(LOG2_OBMC_MAX))
 typedef struct BlockNode{
     int16_t mx;                 ///< Motion vector component X, see mv_scale
     int16_t my;                 ///< Motion vector component Y, see mv_scale
diff --git a/libavcodec/snow_dwt.c b/libavcodec/snow_dwt.c
index 18b315ef66..9401d119d0 100644
--- a/libavcodec/snow_dwt.c
+++ b/libavcodec/snow_dwt.c
@@ -25,6 +25,38 @@
 #include "me_cmp.h"
 #include "snow_dwt.h"
 
+void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride,
+                              uint8_t **block, int b_w, int b_h,
+                              int src_x, int src_y, int src_stride,
+                              slice_buffer * sb, int add, uint8_t * dst8)
+{
+    for (int y = 0; y < b_h; y++) {
+        //FIXME ugly misuse of obmc_stride
+        const uint8_t *obmc1 = obmc  + y * obmc_stride;
+        const uint8_t *obmc2 = obmc1 + (obmc_stride >> 1);
+        const uint8_t *obmc3 = obmc1 + obmc_stride * (obmc_stride >> 1);
+        const uint8_t *obmc4 = obmc3 + (obmc_stride >> 1);
+        IDWTELEM *dst = slice_buffer_get_line(sb, src_y + y);
+        for (int x = 0; x < b_w; x++) {
+            int v = obmc1[x] * block[3][x + y*src_stride]
+                  + obmc2[x] * block[2][x + y*src_stride]
+                  + obmc3[x] * block[1][x + y*src_stride]
+                  + obmc4[x] * block[0][x + y*src_stride];
+
+            v <<= 8 - LOG2_OBMC_MAX;
+            if (FRAC_BITS != 8)
+                v >>= 8 - FRAC_BITS;
+            if (add) {
+                v += dst[x + src_x];
+                v = (v + (1 << (FRAC_BITS - 1))) >> FRAC_BITS;
+                if (v & (~255)) v= ~(v>>31);
+                dst8[x + y*src_stride] = v;
+            } else
+                dst[x + src_x] -= v;
+        }
+    }
+}
+
 int ff_slice_buffer_init(slice_buffer *buf, int line_count,
                          int max_allocated_lines, int line_width,
                          IDWTELEM *base_buffer)
diff --git a/libavcodec/snow_dwt.h b/libavcodec/snow_dwt.h
index 15b8a3007b..132e01f9ce 100644
--- a/libavcodec/snow_dwt.h
+++ b/libavcodec/snow_dwt.h
@@ -29,6 +29,9 @@ struct MpegEncContext;
 typedef int DWTELEM;
 typedef short IDWTELEM;
 
+#define FRAC_BITS 4
+#define LOG2_OBMC_MAX 8
+
 #define MAX_DECOMPOSITIONS 8
 
 typedef struct DWTCompose {
