From f6eeb474824224638dad592e4776823e633b4329 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 17 Oct 2012 15:57:53 +0000
Subject: [PATCH] Add a 1% speed deadzone around speed=1.0 for LTC, MTC slaves

trade-off constant re-sampling to achieve sample-delta ~0,
with trying to avoid resampling if the delta is within
1% of the sample-rate.

git-svn-id: svn://localhost/ardour2/branches/3.0@13300 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/ltc_slave.cc | 6 ++++++
 libs/ardour/mtc_slave.cc | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/libs/ardour/ltc_slave.cc b/libs/ardour/ltc_slave.cc
index 0247a5168f..cbb53c1aad 100644
--- a/libs/ardour/ltc_slave.cc
+++ b/libs/ardour/ltc_slave.cc
@@ -512,6 +512,12 @@ LTC_Slave::speed_and_position (double& speed, framepos_t& pos)
 		return true;
 	}
 
+#if 1
+	/* provide a 1% deadzone to lock the speed */
+	if (fabs(speed - 1.0) <= 0.01)
+	        speed = 1.0;
+#endif
+
 	return true;
 }
 
diff --git a/libs/ardour/mtc_slave.cc b/libs/ardour/mtc_slave.cc
index 79f985e0a2..99cb66d630 100644
--- a/libs/ardour/mtc_slave.cc
+++ b/libs/ardour/mtc_slave.cc
@@ -628,6 +628,12 @@ MTC_Slave::speed_and_position (double& speed, framepos_t& pos)
 		queue_reset (false);
 	}
 
+#if 1
+	/* provide a 1% deadzone to lock the speed */
+	if (fabs(speed - 1.0) <= 0.01)
+	        speed = 1.0;
+#endif
+
 	DEBUG_TRACE (DEBUG::MTC, string_compose ("MTCsync spd: %1 pos: %2 | last-pos: %3 elapsed: %4 delta: %5\n",
 						 speed, pos, last.position, elapsed,  pos - sess_pos));