[FFmpeg-cvslog] r22849 - in trunk/libavcodec: dca.c dcadata.h

mru subversion
Mon Apr 12 13:14:55 CEST 2010


Author: mru
Date: Mon Apr 12 13:14:55 2010
New Revision: 22849

Log:
DCA: simplify lfe_interpolation_fir()

This reorders the lfe_fir tables, and drops the mirrored half,
such that the loops in lfe_interpolation_fir() can be simplified.
The new loop structure should be easier to implement with SIMD.
Static data size is reduced by 2kB.
3% faster on Cortex-A8.

Modified:
   trunk/libavcodec/dca.c
   trunk/libavcodec/dcadata.h

Modified: trunk/libavcodec/dca.c
==============================================================================
--- trunk/libavcodec/dca.c	Mon Apr 12 13:14:51 2010	(r22848)
+++ trunk/libavcodec/dca.c	Mon Apr 12 13:14:55 2010	(r22849)
@@ -802,28 +802,37 @@ static void lfe_interpolation_fir(int de
 
     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;
     }
 }
 

Modified: trunk/libavcodec/dcadata.h
==============================================================================
--- trunk/libavcodec/dcadata.h	Mon Apr 12 13:14:51 2010	(r22848)
+++ trunk/libavcodec/dcadata.h	Mon Apr 12 13:14:55 2010	(r22849)
@@ -7315,1039 +7315,204 @@ DECLARE_ALIGNED(16, static const float, 
 +1.390191784E-007
 };
 
-//FIXME the coeffs are symmetric
 static const float lfe_fir_64[] =
 {
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+    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 */



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