Pause video stream when user press the 'home' button

Classes/LinphoneAppDelegate.m

@@ -27,7 +27,7 @@
 #include "CallHistoryTableViewController.h"
 
 #include "LinphoneManager.h"
-
+#include "linphonecore.h"
 
 @implementation linphoneAppDelegate
 
@@ -37,11 +37,44 @@
 @synthesize myPhoneViewController;
 
 
+-(void)applicationWillResignActive:(UIApplication *)application {
+    LinphoneCore* lc = [LinphoneManager getLc];
+    LinphoneCall* call = linphone_core_get_current_call(lc);
+    if (call == NULL)
+        return;
+    
+    /* save call context */
+    LinphoneManager* instance = [LinphoneManager instance];
+    instance->currentCallContextBeforeGoingBackground.call = call;
+    instance->currentCallContextBeforeGoingBackground.cameraIsEnabled = linphone_call_camera_enabled(call);
+    
+    const LinphoneCallParams* params = linphone_call_get_current_params(call);
+    if (linphone_call_params_video_enabled(params)) {
+        linphone_call_enable_camera(call, false);
+    }
+    
+}
 - (void)applicationDidEnterBackground:(UIApplication *)application {
 	[[LinphoneManager instance] enterBackgroundMode];
 }
 - (void)applicationDidBecomeActive:(UIApplication *)application {
 	[[LinphoneManager instance] becomeActive];
+    
+    LinphoneCore* lc = [LinphoneManager getLc];
+    LinphoneCall* call = linphone_core_get_current_call(lc);
+    if (call == NULL)
+        return;
+    
+    LinphoneManager* instance = [LinphoneManager instance];
+    if (call == instance->currentCallContextBeforeGoingBackground.call) {
+        const LinphoneCallParams* params = linphone_call_get_current_params(call);
+        if (linphone_call_params_video_enabled(params)) {
+            linphone_call_enable_camera(
+                                        call, 
+                                        instance->currentCallContextBeforeGoingBackground.cameraIsEnabled);
+        }
+        instance->currentCallContextBeforeGoingBackground.call = 0;
+    }
 }
 
 - (void) loadDefaultSettings {

Classes/LinphoneUI/LinphoneManager.h

@@ -29,6 +29,13 @@ typedef enum _Connectivity {
 	,none
 } Connectivity;
 @class FastAddressBook;
+
+/* Application specific call context */
+typedef struct _CallContext {
+    LinphoneCall* call;
+    bool_t cameraIsEnabled;
+} CallContext;
+
 @interface LinphoneManager : NSObject <AVAudioSessionDelegate> {
 @private
 	SCNetworkReachabilityContext proxyReachabilityContext;
@@ -44,7 +51,9 @@ typedef enum _Connectivity {
     FastAddressBook* mFastAddressBook;
 	const char*  frontCamId;
 	const char*  backCamId;
-	
+    
+@public
+    CallContext currentCallContextBeforeGoingBackground;
 }
 +(LinphoneManager*) instance;
 +(LinphoneCore*) getLc;