Added new FreeSWITCH module mod_avmd or the Advanced Voicemail Detection Module.

It provides better detection than mod_vmd but is a little more CPU intensive than mod_vmd.

Perhaps someone would like to CUDAfy this code?

src/mod/applications/mod_avmd/buffer.c

@@ -0,0 +1,23 @@
+#ifndef __BUFFER_H__
+#include "buffer.h"
+#endif
+
+extern size_t next_power_of_2(size_t v)
+{
+    size_t prev;
+    size_t tmp = 1;
+
+    v++;
+
+    do{
+        prev = v;
+        v &= ~tmp;
+        tmp <<= 1;
+    }while(v != 0);
+
+    prev <<= 1;
+
+    return prev;
+}
+
+