diff --git a/libavcodec/fmtconvert.c b/libavcodec/fmtconvert.c
index e6fc509a96..1de1d318d2 100644
--- a/libavcodec/fmtconvert.c
+++ b/libavcodec/fmtconvert.c
@@ -51,34 +51,3 @@ av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
     if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx);
     if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c);
 }
-
-/* ffdshow custom code */
-void float_interleave(float *dst, const float **src, long len, int channels)
-{
-    int i,j,c;
-    if(channels==2){
-        for(i=0; i<len; i++){
-            dst[2*i]   = src[0][i] / 32768.0f;
-            dst[2*i+1] = src[1][i] / 32768.0f;
-        }
-    }else{
-        for(c=0; c<channels; c++)
-            for(i=0, j=c; i<len; i++, j+=channels)
-                dst[j] = src[c][i] / 32768.0f;
-    }
-}
-
-void float_interleave_noscale(float *dst, const float **src, long len, int channels)
-{
-    int i,j,c;
-    if(channels==2){
-        for(i=0; i<len; i++){
-            dst[2*i]   = src[0][i];
-            dst[2*i+1] = src[1][i];
-        }
-    }else{
-        for(c=0; c<channels; c++)
-            for(i=0, j=c; i<len; i++, j+=channels)
-                dst[j] = src[c][i];
-    }
-}
diff --git a/libavcodec/fmtconvert.h b/libavcodec/fmtconvert.h
index 401ac3a1fc..4b8b9580d2 100644
--- a/libavcodec/fmtconvert.h
+++ b/libavcodec/fmtconvert.h
@@ -63,8 +63,4 @@ void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx);
 void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx);
 void ff_fmt_convert_init_mips(FmtConvertContext *c);
 
-/* ffdshow custom code */
-void float_interleave(float *dst, const float **src, long len, int channels);
-void float_interleave_noscale(float *dst, const float **src, long len, int channels);
-
 #endif /* AVCODEC_FMTCONVERT_H */