Pause SIP call when audio is interrupted by OS (on incoming GSM call for instance)

The SIP call is automatically resumed when audio is available.

Classes/AdvancedPhoneViewController.m

@@ -51,6 +51,8 @@
 	
 }
 -(void) displayIncallFromUI:(UIViewController*) viewCtrl forUser:(NSString*) username withDisplayName:(NSString*) displayName {
+    [self presentModalViewController:mIncallViewController animated:true];
+
 	[super displayIncallFromUI:viewCtrl
 					   forUser:username
 			   withDisplayName:displayName];
@@ -65,6 +67,12 @@
 	[mIncallViewController displayStatus:message];
 }
 
+-(void) updateUIFromLinphoneState:(UIViewController*) viewCtrl {
+    [super updateUIFromLinphoneState:viewCtrl];
+    
+	[mIncallViewController updateUIFromLinphoneState:viewCtrl];
+}
+
 - (void)dealloc {
     [mIncallViewController release];
 	[super dealloc];

Classes/IncallViewController.h

@@ -35,6 +35,7 @@
 	UIHangUpButton* endCtrl;
 	UIButton* dialer;
 	UIMuteButton* mute;
+    UIPauseResumeButton* pause;
 	UISpeakerButton* speaker;
 	UIButton* contacts;
 
@@ -74,6 +75,7 @@
 @property (nonatomic, retain) IBOutlet UIButton* endCtrl;
 @property (nonatomic, retain) IBOutlet UIButton* dialer;
 @property (nonatomic, retain) IBOutlet UIButton* mute;
+@property (nonatomic, retain) IBOutlet UIButton* pause;
 @property (nonatomic, retain) IBOutlet UIButton* speaker;
 @property (nonatomic, retain) IBOutlet UIButton* contacts;
 

Classes/IncallViewController.m

@@ -35,6 +35,7 @@
 @synthesize endCtrl;
 @synthesize close;
 @synthesize mute;
+@synthesize pause;
 @synthesize dialer;
 @synthesize speaker;
 @synthesize contacts;
@@ -70,6 +71,7 @@
     [super viewDidLoad];
 	//Controls
 	[mute initWithOnImage:[UIImage imageNamed:@"mic_muted.png"]  offImage:[UIImage imageNamed:@"mic_active.png"] ];
+    [pause initWithOnImage:[UIImage imageNamed:@"resumecall.png"]  offImage:[UIImage imageNamed:@"pausecall.png"] ];
 	[speaker initWithOnImage:[UIImage imageNamed:@"Speaker-32-on.png"]  offImage:[UIImage imageNamed:@"Speaker-32-off.png"] ];
 	
 
@@ -127,6 +129,11 @@
 	[callDuration stop];
 	[self dismissModalViewControllerAnimated:true];
 }
+-(void) updateUIFromLinphoneState:(UIViewController *)viewCtrl {
+    [mute reset];
+    [pause reset];
+}
+
 - (IBAction)doAction:(id)sender {
 	
 	if (sender == dialer) {

Classes/LinphoneUI/LinphoneManager.m

@@ -790,11 +790,15 @@ void networkReachabilityCallBack(SCNetworkReachabilityRef target, SCNetworkReach
 }
 
 -(void) endInterruption {
-    const MSList* c = linphone_core_get_calls(theLinphoneCore);
     ms_message("Sound interruption ended!");
+    const MSList* c = linphone_core_get_calls(theLinphoneCore);
+    
     if (c) {
+        ms_message("Auto resuming call");
         linphone_core_resume_call(theLinphoneCore, (LinphoneCall*) c->data);
-    }    
+    }
+    
+    [callDelegate updateUIFromLinphoneState:mCurrentViewController];
 }
 
 @end

Classes/LinphoneUI/LinphoneUIDelegates.h

@@ -25,6 +25,7 @@
 -(void) displayCallInProgressFromUI:(UIViewController*) viewCtrl forUser:(NSString*) username withDisplayName:(NSString*) displayName;
 -(void) displayIncomingCallNotigicationFromUI:(UIViewController*) viewCtrl forUser:(NSString*) username withDisplayName:(NSString*) displayName;
 -(void) displayIncallFromUI:(UIViewController*) viewCtrl forUser:(NSString*) username withDisplayName:(NSString*) displayName;
+-(void) updateUIFromLinphoneState:(UIViewController*) viewCtrl;
 //status reporting
 -(void) displayStatus:(NSString*) message; 
 @end

Classes/LinphoneUI/UILinphone.h

@@ -26,3 +26,4 @@
 #import "UIDuration.h"
 #import "UIEraseButton.h"
 #import "LinphoneUIDelegates.h"
+#import "UIPauseResumeButton.h"

Classes/LinphoneUI/UIPauseResumeButton.h

@@ -0,0 +1,28 @@
+/* UIMuteButton.h
+ *
+ * Copyright (C) 2011  Belledonne Comunications, Grenoble, France
+ *
+ *  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.
+ */       
+
+#import <UIKit/UIKit.h>
+#import "UIToggleButton.h"
+
+
+@interface UIPauseResumeButton : UIToggleButton<UIToggleButtonDelegate> {
+
+}
+
+@end

Classes/LinphoneUI/UIPauseResumeButton.m

@@ -0,0 +1,69 @@
+/* UIMuteButton.m
+ *
+ * Copyright (C) 2011  Belledonne Comunications, Grenoble, France
+ *
+ *  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.
+ */       
+#import "UIPauseResumeButton.h"
+#include "LinphoneManager.h"
+
+
+@implementation UIPauseResumeButton
+
+
+
+-(void) onOn {
+    LinphoneCall* c = linphone_core_get_current_call([LinphoneManager getLc]);
+    if (c) {
+        linphone_core_pause_call([LinphoneManager getLc], c);
+    }
+}
+-(void) onOff {
+	const MSList* c = linphone_core_get_calls([LinphoneManager getLc]);
+    if (c) {
+        linphone_core_resume_call([LinphoneManager getLc], (LinphoneCall*) c->data);
+    }
+}
+-(bool) isInitialStateOn {
+	@try {
+        const MSList* c = linphone_core_get_calls([LinphoneManager getLc]);
+        
+        if (c) {
+            return linphone_call_get_state((LinphoneCall*)c->data) == LinphoneCallPaused;
+        } else {
+            
+            return false;
+        }
+	} @catch(NSException* e) {
+		//not ready yet
+		return false;
+	}
+	
+}
+
+/*
+// Only override drawRect: if you perform custom drawing.
+// An empty implementation adversely affects performance during animation.
+- (void)drawRect:(CGRect)rect {
+    // Drawing code.
+}
+*/
+
+- (void)dealloc {
+    [super dealloc];
+}
+
+
+@end

Classes/PhoneViewController.m

@@ -234,6 +234,10 @@
 	[status setText:message];
 }
 
+-(void) updateUIFromLinphoneState:(UIViewController*) viewCtrl {
+	[mute reset];
+}
+
 
 -(void) displayIncomingCallNotigicationFromUI:(UIViewController*) viewCtrl forUser:(NSString*) username withDisplayName:(NSString*) displayName {