diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index 7a6841d49c..79ea37316c 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -802,28 +802,37 @@ static void lfe_interpolation_fir(int decimation_select,
 
     int decifactor, k, j;
     const float *prCoeff;
-
-    int interp_index = 0;       /* Index to the interpolated samples */
     int deciindex;
 
     /* Select decimation filter */
     if (decimation_select == 1) {
-        decifactor = 128;
+        decifactor = 64;
         prCoeff = lfe_fir_128;
     } else {
-        decifactor = 64;
+        decifactor = 32;
         prCoeff = lfe_fir_64;
     }
     /* Interpolation */
     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {
-        /* One decimated sample generates decifactor interpolated ones */
+        float *samples_out2 = samples_out + decifactor;
+        const float *cf0 = prCoeff;
+        const float *cf1 = prCoeff + 256;
+
+        /* One decimated sample generates 2*decifactor interpolated ones */
         for (k = 0; k < decifactor; k++) {
-            float rTmp = 0.0;
-            //FIXME the coeffs are symetric, fix that
-            for (j = 0; j < 512 / decifactor; j++)
-                rTmp += samples_in[deciindex - j] * prCoeff[k + j * decifactor];
-            samples_out[interp_index++] = (rTmp * scale) + bias;
+            float v0 = 0.0;
+            float v1 = 0.0;
+            for (j = 0; j < 256 / decifactor; j++) {
+                float s = samples_in[-j];
+                v0 += s * *cf0++;
+                v1 += s * *--cf1;
+            }
+            *samples_out++  = (v0 * scale) + bias;
+            *samples_out2++ = (v1 * scale) + bias;
         }
+
+        samples_in++;
+        samples_out += decifactor;
     }
 }
 
diff --git a/libavcodec/dcadata.h b/libavcodec/dcadata.h
index c7266aa4ba..657f3c8d06 100644
--- a/libavcodec/dcadata.h
+++ b/libavcodec/dcadata.h
@@ -7315,1039 +7315,204 @@ DECLARE_ALIGNED(16, static const float, fir_32bands_nonperfect)[] =
 +1.390191784E-007
 };
 
-//FIXME the coeffs are symmetric
 static const float lfe_fir_64[] =
 {
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+    3.259649574756622e-1, 1.733186990022659e-1,
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+    9.251192095689476e-4, 2.486028522253036e-2,
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+    3.846437484025955e-2, 2.256359672173858e-3,
+    9.974770946428180e-4, 2.575986087322235e-2,
+    1.386037617921829e-1, 3.042849004268646e-1,
+    3.231448531150818e-1, 1.678375005722046e-1,
+    3.726511076092720e-2, 2.119151875376701e-3,
+    1.073930296115577e-3, 2.668286114931106e-2,
+    1.411831974983215e-1, 3.062185347080230e-1,
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+    3.609224036335945e-2, 1.988604199141264e-3,
+    1.155023579485714e-3, 2.762960828840732e-2,
+    1.437802612781525e-1, 3.081108033657074e-1,
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+    3.494550660252571e-2, 1.864377525635064e-3,
+    1.240676851011813e-3, 2.860039286315441e-2,
+    1.463943719863892e-1, 3.099608123302460e-1,
+    3.185488879680634e-1, 1.596965193748474e-1,
+    3.382468968629837e-2, 1.746327499859035e-3,
+    1.331258914433420e-3, 2.959549613296986e-2,
+    1.490248143672943e-1, 3.117676973342896e-1,
+    3.169221282005310e-1, 1.570075154304504e-1,
+    3.272953629493714e-2, 1.634211512282491e-3,
+    1.426893868483603e-3, 3.061520494520664e-2,
+    1.516709625720978e-1, 3.135308027267456e-1,
+    3.152491748332978e-1, 1.543320864439010e-1,
+    3.165979683399200e-2, 1.527829794213176e-3,
 };
 
-//FIXME the coeffs are symmetric
-
 static const float lfe_fir_128[] =
 {
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 };
 
 /* 10^-(dB/20), with dB being a list of dB values ranging from 0 to -72 */