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Accurate buffer size estimation

--- a/libfaac/blockswitch.c

+++ b/libfaac/blockswitch.c

@@ -276,8 +276,8 @@

     double cosfreq8, sinfreq8;

     int i, n;

-    double xi[BLOCK_LEN_LONG];

-    double xr[BLOCK_LEN_LONG];

+    double xi[BLOCK_LEN_LONG / 2];

+    double xr[BLOCK_LEN_LONG / 2];

     /* prepare for recurrence relation in pre-twiddle */

     cfreq = cos (freq);