Merge pull request #304 from AronVietti/Bug#23-AppNap

Fixes issue with AppNap causing stuttering/silence in background

Jamulus.pro

@@ -91,6 +91,8 @@ win32 {
     QT += macextras
     HEADERS += mac/sound.h
     SOURCES += mac/sound.cpp
+    HEADERS += mac/activity.h
+    OBJECTIVE_SOURCES += mac/activity.mm
     RC_FILE = mac/mainicon.icns
     CONFIG += x86
     QMAKE_TARGET_BUNDLE_PREFIX = net.sourceforge.llcon
@@ -107,7 +109,8 @@ win32 {
         -framework CoreAudio \
         -framework CoreMIDI \
         -framework AudioToolbox \
-        -framework AudioUnit
+        -framework AudioUnit \
+        -framework Foundation
 
     # replace coreaudio with jack if requested
     contains(CONFIG, "jackonmac") {

mac/activity.h

@@ -0,0 +1,46 @@
+/******************************************************************************\
+ * Copyright (c) 2004-2020
+ *
+ * Author(s):
+ *  Volker Fischer
+ *
+ ******************************************************************************
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+\******************************************************************************/
+#pragma once
+
+// Forward Delcaration to pointer that holds the activity id
+class CActivityId;
+
+// Reperesents an OSX specific activity. See Managing Activities
+// https://developer.apple.com/documentation/foundation/nsprocessinfo?language=objc
+// This essentially lets us start and stop an Activity frame where we tell the OS
+// that we are Latency Critical and are not performing background tasks.
+class CActivity
+{
+private:
+    CActivityId *pActivity;
+    
+public:
+    CActivity();
+    
+    ~CActivity();
+    
+    void BeginActivity();
+
+    void EndActivity();
+};

mac/activity.mm

@@ -0,0 +1,53 @@
+/******************************************************************************\
+ * Copyright (c) 2004-2020
+ *
+ * Author(s):
+ *  Volker Fischer
+ *
+ ******************************************************************************
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+\******************************************************************************/
+
+#include "activity.h"
+#include <Foundation/Foundation.h>
+
+class CActivityId
+{
+public:
+    id<NSObject> activityId;
+};
+
+CActivity::CActivity() : pActivity(new CActivityId()) {}
+
+CActivity::~CActivity()
+{
+    delete pActivity;
+}
+
+void CActivity::BeginActivity()
+{
+    NSActivityOptions options = NSActivityBackground | NSActivityIdleSystemSleepDisabled | NSActivityLatencyCritical;
+    
+    pActivity->activityId = [[NSProcessInfo processInfo] beginActivityWithOptions: options reason:@"Jamulus provides low latency audio processing and should not be inturrupted by system throttling."];
+}
+
+void CActivity::EndActivity()
+{
+    [[NSProcessInfo processInfo] endActivity: pActivity->activityId];
+    
+    pActivity->activityId = nil;
+}

src/main.cpp

@@ -37,6 +37,9 @@
 #ifdef ANDROID
 # include <QtAndroidExtras/QtAndroid>
 #endif
+#if defined ( __APPLE__ ) || defined ( __MACOSX )
+# include "mac/activity.h"
+#endif
 
 
 // Implementation **************************************************************
@@ -517,8 +520,7 @@ int main ( int argc, char** argv )
     {
         tsConsole << "Qt5 requires a windowing system to paint a JPEG image; image will use SVG" << endl;
     }
-
-
+    
     // Application/GUI setup ---------------------------------------------------
     // Application object
     QCoreApplication* pApp = bUseGUI
@@ -550,6 +552,14 @@ int main ( int argc, char** argv )
     QDir ApplDir ( QApplication::applicationDirPath() );
     pApp->addLibraryPath ( QString ( ApplDir.absolutePath() ) );
 #endif
+    
+#if defined ( __APPLE__ ) || defined ( __MACOSX )
+    // On OSX we need to declare an activity to ensure the process doesn't get
+    // throttled by OS level Nap, Sleep, and Thread Priority systems.
+    CActivity activity;
+
+    activity.BeginActivity();
+#endif
 
     // init resources
     Q_INIT_RESOURCE(resources);
@@ -688,6 +698,10 @@ int main ( int argc, char** argv )
             tsConsole << generr.GetErrorText() << endl;
         }
     }
+    
+    #if defined ( __APPLE__ ) || defined ( __MACOSX )
+        activity.EndActivity();
+    #endif
 
     return 0;
 }