shithub: aacenc

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a little M/S optimization

--- a/libfaac/stereo.c

+++ b/libfaac/stereo.c

@@ -140,17 +140,25 @@

 {

     int sfb;

     int win;

+    int sfmin;

-    for (sfb = 0; sfb < coder->sfbn; sfb++)

+    if (coder->block_type == ONLY_SHORT_WINDOW)

+        sfmin = 1;

+    else

+        sfmin = 8;

+

+    for (sfb = 0; sfb < sfmin; sfb++)

     {

+        channel->msInfo.ms_used[*sfcnt] = 0;

+        (*sfcnt)++;

+    }

+    for (sfb = sfmin; sfb < coder->sfbn; sfb++)

+    {

         int ms = 0;

         int l, start, end;

         double sum, diff;

         double enrgs, enrgd, enrgl, enrgr;

-        if (sfb < 1)

-            goto setms;

-

         start = coder->sfb_offset[sfb];

         end = coder->sfb_offset[sfb + 1];

@@ -233,7 +241,6 @@

             }

         }

-    setms:

         channel->msInfo.ms_used[*sfcnt] = ms;

         (*sfcnt)++;

     }