[zaptel-commits] trunk r1025 - /trunk/mg2ec.h

[zaptel-commits at lists.digium.com]

Author: mattf
Date: Mon May  8 06:17:43 2006
New Revision: 1025

URL: http://svn.digium.com/view/zaptel?rev=1025&view=rev
Log:
Improve CPU performance of MG2 by using a counter instead of a history

Modified:
    trunk/mg2ec.h

Modified: trunk/mg2ec.h
URL: http://svn.digium.com/view/zaptel/trunk/mg2ec.h?rev=1025&r1=1024&r2=1025&view=diff
==============================================================================
--- trunk/mg2ec.h (original)
+++ trunk/mg2ec.h Mon May  8 06:17:43 2006
@@ -158,8 +158,8 @@
 	int avg_Lu_i_toolow; 
 	int avg_Lu_i_ok;
 #endif 
-	short lastsig[256];
-	int lastpos;
+	short lastsig;
+	int lastcount;
 	int backup;
 #ifdef DC_NORMALIZE
 	int dc_estimate;
@@ -327,18 +327,18 @@
   			ec->N_d);
 	rs >>= 15;
 
-	ec->lastsig[ec->lastpos++] = isig;
-	if (ec->lastpos >= 256)
-		ec->lastpos = 0;
-
-	for (k=0; k < 256; k++) {
-		if (isig != ec->lastsig[k])
-			break;
+	if (ec->lastsig == isig) {
+		ec->lastcount++;
+	} else {
+		ec->lastcount = 0;
+		ec->lastsig = isig;
 	}
 
 	if (isig == 0) {
 		u = 0;
-	} else if (k == 256) {
+	} else if (ec->lastcount > 255) {
+		/* We have seen the same input-signal more than 255 times,
+		 * we should pass it through uncancelled, as we are likely on hold */
 		u = isig;
 	} else {
 		if (rs < -32768) {