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midside: use energy threshold rather than volume threshold

--- a/libfaac/midside.c

+++ b/libfaac/midside.c

@@ -123,8 +123,8 @@

     int chn;

     int usems;

     double mutethr;

-    static const double thr075 = 0.09; /* ~0.75dB */

-    static const double thrmax = 0.25; /* ~2dB */

+    static const double thr075 = 0.1885; /* ~0.75dB */

+    static const double thrmax = 1.5; /* ~1.76dB */

     if (quality > 0.01)

     {