From eacd4af0a4ff2a7163a07f428037044007c6ab7a Mon Sep 17 00:00:00 2001
From: mattf <mattf@5390a7c7-147a-4af0-8ec9-7488f05a26cb>
Date: Thu, 8 Sep 2005 00:19:49 +0000
Subject: Add aggressive suppressor timelimit  (Bug #4823)

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@757 5390a7c7-147a-4af0-8ec9-7488f05a26cb
---
 mec2.h       | 17 ++++++++++++++---
 mec2_const.h |  3 +++
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/mec2.h b/mec2.h
index b340622..c539cfd 100755
--- a/mec2.h
+++ b/mec2.h
@@ -334,10 +334,21 @@ static inline short echo_can_update(echo_can_state_t *ec, short iref, short isig
   */
 #ifndef NO_ECHO_SUPPRESSOR
 #ifdef AGGRESSIVE_SUPPRESSOR
-  if ((ec->HCNTR_d < AGGRESSIVE_HCNTR) && (ec->Ly_i > (ec->Lu_i << 1))) {
- 	u = u * (ec->Lu_i >> DEFAULT_SIGMA_LU_I) / ((ec->Ly_i >> (DEFAULT_SIGMA_LY_I)) + 1);
- 	u = u * (ec->Lu_i >> DEFAULT_SIGMA_LU_I) / ((ec->Ly_i >> (DEFAULT_SIGMA_LY_I)) + 1);
+#ifdef AGGRESSIVE_TIMELIMIT /* This allows the aggressive suppressor to turn off after set amount of time */
+  if (ec->i_d > AGGRESSIVE_TIMELIMIT ) {
+  	if ((ec->HCNTR_d == 0) && ((ec->Ly_i/(ec->Lu_i + 1)) > DEFAULT_SUPPR_I)) {
+        	u = u * (ec->Lu_i >> DEFAULT_SIGMA_LU_I) / ((ec->Ly_i >> (DEFAULT_SIGMA_LY_I + 2)) + 1);
+  	}
   }
+  else {
+#endif
+  	if ((ec->HCNTR_d < AGGRESSIVE_HCNTR) && (ec->Ly_i > (ec->Lu_i << 1))) {
+ 		u = u * (ec->Lu_i >> DEFAULT_SIGMA_LU_I) / ((ec->Ly_i >> (DEFAULT_SIGMA_LY_I)) + 1);
+ 		u = u * (ec->Lu_i >> DEFAULT_SIGMA_LU_I) / ((ec->Ly_i >> (DEFAULT_SIGMA_LY_I)) + 1);
+  	}
+#ifdef AGGRESSIVE_TIMELIMIT  
+  }
+#endif
 #else	
   if ((ec->HCNTR_d == 0) && ((ec->Ly_i/(ec->Lu_i + 1)) > DEFAULT_SUPPR_I)) {
   	u = u * (ec->Lu_i >> DEFAULT_SIGMA_LU_I) / ((ec->Ly_i >> (DEFAULT_SIGMA_LY_I + 2)) + 1);
diff --git a/mec2_const.h b/mec2_const.h
index 9c897f4..4c7e8c9 100755
--- a/mec2_const.h
+++ b/mec2_const.h
@@ -21,5 +21,8 @@
 #define RES_SUPR_FACTOR -20
 #define AGGRESSIVE_HCNTR 160	/* 20ms */
 
+/* Only use agressive echo cancellation for this amount of time then go back to normal cancelation */
+/* #define AGGRESSIVE_TIMELIMIT 150000 */ /* 8 = 1ms */
+
 #endif /* _MEC2_CONST_H */
 
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