From e5efc3656090d39de1d8854aa495c8c16218c2f6 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sun, 24 Jul 2016 10:06:27 +0200
Subject: Clear output buffers in LV2 and jack modes before each process
 iteration to eliminte noise when drumkit has not yet been loaded.

---
 drumgizmo/output/jackaudio.cc |  7 +++++++
 plugin/drumgizmo_plugin.cc    | 16 +++++++++-------
 src/drumgizmo.cc              | 20 ++++++++------------
 3 files changed, 24 insertions(+), 19 deletions(-)

diff --git a/drumgizmo/output/jackaudio.cc b/drumgizmo/output/jackaudio.cc
index 2274bea..2620b84 100644
--- a/drumgizmo/output/jackaudio.cc
+++ b/drumgizmo/output/jackaudio.cc
@@ -26,6 +26,7 @@
  */
 #include <cassert>
 #include <iostream>
+#include <cstring>
 
 #include "jackaudio.h"
 
@@ -83,6 +84,12 @@ void JackAudioOutputEngine::stop()
 
 void JackAudioOutputEngine::pre(size_t nsamples)
 {
+	// Clear all channels
+	for(auto& channel : channels)
+	{
+		assert(channel.samples.size() == nsamples);
+		std::memset(channel.samples.data(), 0, nsamples * sizeof(sample_t));
+	}
 }
 
 void JackAudioOutputEngine::run(int ch, sample_t* samples, size_t nsamples)
diff --git a/plugin/drumgizmo_plugin.cc b/plugin/drumgizmo_plugin.cc
index 5e4ebeb..fa51575 100644
--- a/plugin/drumgizmo_plugin.cc
+++ b/plugin/drumgizmo_plugin.cc
@@ -26,13 +26,7 @@
  */
 #include "drumgizmo_plugin.h"
 
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <assert.h>
-
-#include <iostream>
+#include <cstring>
 
 #include <midievent.h>
 
@@ -292,6 +286,14 @@ void DrumGizmoPlugin::Output::stop()
 
 void DrumGizmoPlugin::Output::pre(size_t nsamples)
 {
+	// Clear all channels
+	for(auto& channel : *plugin.output_samples)
+	{
+		if(channel)
+		{
+			std::memset(channel, 0, nsamples * sizeof(sample_t));
+		}
+	}
 }
 
 void DrumGizmoPlugin::Output::run(int ch, sample_t *samples, size_t nsamples)
diff --git a/src/drumgizmo.cc b/src/drumgizmo.cc
index fa601e6..18cbbb7 100644
--- a/src/drumgizmo.cc
+++ b/src/drumgizmo.cc
@@ -26,21 +26,16 @@
  */
 #include "drumgizmo.h"
 
-#include <math.h>
-#include <stdio.h>
-#include <assert.h>
+#include <cmath>
+#include <cstdio>
+#include <cassert>
+#include <cstring>
 
 #include <event.h>
 #include <audiotypes.h>
-
-#include <string.h>
-
-#include <hugin.hpp>
-
-#include <memory>
 #include <config.h>
 
-#include <iostream>
+#include <hugin.hpp>
 
 #include "drumkitparser.h"
 #include "audioinputenginemidi.h"
@@ -122,7 +117,8 @@ bool DrumGizmo::run(size_t pos, sample_t *samples, size_t nsamples)
 	setFreeWheel(ie.isFreewheeling() && oe.isFreewheeling());
 
 	ie.pre();
-	oe.pre(nsamples);
+	oe.pre(nsamples); // Clears all output buffers
+	std::memset(samples, 0, nsamples * sizeof(sample_t));
 
 	//
 	// Read new events
@@ -161,7 +157,7 @@ bool DrumGizmo::run(size_t pos, sample_t *samples, size_t nsamples)
 
 			if(buf)
 			{
-				memset(buf, 0, nsamples * sizeof(sample_t));
+				std::memset(buf, 0, nsamples * sizeof(sample_t));
 
 				getSamples(c, pos, buf, nsamples);
 
-- 
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