ffmpeg roll of source to mar 9 version...

patched-ffmpeg-mt/libavcodec/celp_filters.c

 /*
  * various filters for ACELP-based codecs
  *
  * Copyright (c) 2008 Vladimir Voroshilov
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 68 matching lines @@
 
     return 0;
 }
 
 void ff_celp_lp_synthesis_filterf(float *out, const float *filter_coeffs,
                                   const float* in, int buffer_length,
                                   int filter_length)
 {
     int i,n;
 
+#if 0 // Unoptimized code path for improved readability
+    for (n = 0; n < buffer_length; n++) {
+        out[n] = in[n];
+        for (i = 1; i <= filter_length; i++)
+            out[n] -= filter_coeffs[i-1] * out[n-i];
+    }
+#else
     float out0, out1, out2, out3;
     float old_out0, old_out1, old_out2, old_out3;
     float a,b,c;
 
     a = filter_coeffs[0];
     b = filter_coeffs[1];
     c = filter_coeffs[2];
     b -= filter_coeffs[0] * filter_coeffs[0];
     c -= filter_coeffs[1] * filter_coeffs[0];
     c -= filter_coeffs[0] * b;
@@ skipping 80 matching lines @@
         in  += 4;
     }
 
     out -= n;
     in -= n;
     for (; n < buffer_length; n++) {
         out[n] = in[n];
         for (i = 1; i <= filter_length; i++)
             out[n] -= filter_coeffs[i-1] * out[n-i];
     }
+#endif
 }
 
 void ff_celp_lp_zero_synthesis_filterf(float *out, const float *filter_coeffs,
                                        const float *in, int buffer_length,
                                        int filter_length)
 {
     int i,n;
 
     for (n = 0; n < buffer_length; n++) {
         out[n] = in[n];
         for (i = 1; i <= filter_length; i++)
             out[n] += filter_coeffs[i-1] * in[n-i];
     }
 }