Add a check to see if there is currently audio for a call. (#138)

Example/VialerSIPLib/Base.lproj/Main.storyboard

@@ -66,7 +66,7 @@
                                     <action selector="useVideoSwichPressed:" destination="AyF-vj-IOS" eventType="touchUpInside" id="bak-YC-pTt"/>
                                 </connections>
                             </switch>
-                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Unreigster after call" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="hgl-hR-eAW">
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Unregister after call" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="hgl-hR-eAW">
                                 <rect key="frame" x="18" y="521" width="210" height="30"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="25"/>
                                 <color key="textColor" red="0.0" green="0.48058944939999998" blue="0.99789065119999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>

Example/VialerSIPLib/VSLCallViewController.swift

@@ -54,6 +54,7 @@ class VSLCallViewController: UIViewController, VSLKeypadViewControllerDelegate {
         activeCall?.addObserver(self, forKeyPath: "callState", options: .new, context: &myContext)
         activeCall?.addObserver(self, forKeyPath: "onHold", options: .new, context: &myContext)
         NotificationCenter.default.addObserver(self, selector: #selector(updateUI), name: NSNotification.Name(rawValue: VSLAudioControllerAudioInterrupted), object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(noAudioForCall), name: Notification.Name.VSLCallNoAudioForCall, object: nil)
     }
 
     override func viewWillDisappear(_ animated: Bool) {
@@ -63,6 +64,7 @@ class VSLCallViewController: UIViewController, VSLKeypadViewControllerDelegate {
         activeCall?.removeObserver(self, forKeyPath: "callState")
         activeCall?.removeObserver(self, forKeyPath: "onHold")
         NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: VSLAudioControllerAudioInterrupted), object: nil)
+        NotificationCenter.default.removeObserver(self, name: Notification.Name.VSLCallNoAudioForCall, object: nil)
     }
 
     // MARK: - Outlets
@@ -168,6 +170,12 @@ class VSLCallViewController: UIViewController, VSLKeypadViewControllerDelegate {
         }
     }
 
+    @objc func noAudioForCall() {
+        guard let call = activeCall, call.callState != .disconnected else { return }
+
+        call.reinvite()
+    }
+
     @objc func updateUI() {
         guard let call = activeCall else { return }
         updateLabels(call: call, statusLabel: statusLabel, numberLabel: numberLabel)

Example/VialerSIPLib/VialerSIPLib_Example-Bridging-Header.h

@@ -4,6 +4,7 @@
 
 #import "DDLogWrapper.h"
 #import <VialerSIPLib/VSLAudioController.h>
+#import <VialerSIPLib/VSLCall.h>
 #import <VialerSIPLib/VialerSIPLib.h>
 #import <VialerSIPLib/VSLRingtone.h>
 #import <VialerSIPLib/CallKitProviderDelegate.h>

Pod/Classes/VSLCall.h

@@ -22,8 +22,16 @@ extern NSString * _Nonnull const VSLCallStateChangedNotification;
  */
 extern NSString * _Nonnull const VSLNotificationUserInfoVideoSizeRenderKey;
 
+/**
+ *  Notification for when the VSLCall object has been dealloced.
+ */
 extern NSString * _Nonnull const VSLCallDeallocNotification;
 
+/**
+ *  Notification for when there is no audio during a call.
+ */
+extern NSString * _Nonnull const VSLCallNoAudioForCallNotification;
+
 /**
  *  Notification that will be posted when a phonecall is connected.
  */
@@ -34,7 +42,6 @@ extern NSString * _Nonnull const VSLCallConnectedNotification DEPRECATED_MSG_ATT
  */
 extern NSString * _Nonnull const VSLCallDisconnectedNotification DEPRECATED_MSG_ATTRIBUTE("Deprecated, listen for VSLCallStateChangedNotification instead");
 
-
 /**
  *  The posible errors VSLCall can return.
  */

Pod/Classes/VSLCall.m

@@ -24,6 +24,7 @@
 NSString * const VSLCallConnectedNotification = @"VSLCallConnectedNotification";
 NSString * const VSLCallDisconnectedNotification = @"VSLCallDisconnectedNotification";
 NSString * const VSLCallDeallocNotification = @"VSLCallDeallocNotification";
+NSString * const VSLCallNoAudioForCallNotification = @"VSLCallNoAudioForCallNotification";
 
 @interface VSLCall()
 @property (readwrite, nonatomic) VSLCallState callState;
@@ -51,6 +52,8 @@ @interface VSLCall()
 @property (strong, nonatomic) NSString *numberToCall;
 @property (weak, nonatomic) VSLAccount *account;
 @property (nonatomic) BOOL reinviteCall;
+@property (readwrite, nonatomic) NSTimer *audioCheckTimer;
+@property (readwrite, nonatomic) int audioCheckTimerFired;
 /**
  *  Stats
  */
@@ -388,9 +391,42 @@ - (void)mediaStateChanged:(pjsua_call_info)callInfo  {
         pjsua_conf_connect(0, callInfo.conf_slot);
     }
 
+    if (self.mediaState == VSLMediaStateActive && ![self.audioCheckTimer isValid]) {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            self.audioCheckTimerFired = 0;
+            self.audioCheckTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(checkIfAudioPresent) userInfo: nil repeats: YES];
+        });
+    }
+
     [self updateCallInfo:callInfo];
 }
 
+- (void)checkIfAudioPresent {
+    pjsua_call_info callInfo;
+    pjsua_call_get_info((pjsua_call_id)self.callId, &callInfo);
+
+    pj_status_t status;
+    pjsua_stream_stat stream_stat;
+    status = pjsua_call_get_stream_stat((pjsua_call_id)self.callId, callInfo.media[0].index, &stream_stat);
+
+    int rxPkt = stream_stat.rtcp.rx.pkt;
+    int txPkt = stream_stat.rtcp.tx.pkt;
+
+    if (rxPkt == 0 || txPkt == 0) {
+        VSLLogWarning(@"There is NO audio %f: sec into the call. Trying a reinvite", self.lastSeenConnectDuration);
+        [[NSNotificationCenter defaultCenter] postNotificationName:VSLCallNoAudioForCallNotification object:nil];
+        [self.audioCheckTimer invalidate];
+    }
+
+    if (self.audioCheckTimerFired > 5) {
+        VSLLogInfo(@"There is audio in the last 10 seconds rxPkt: %d and txPkt: %d", rxPkt, txPkt);
+        [self.audioCheckTimer invalidate];
+        self.audioCheckTimerFired = 0;
+    }
+
+    self.audioCheckTimerFired++;
+}
+
 #pragma mark - User actions
 - (void)answerWithCompletion:(void (^)(NSError *error))completion {
     pj_status_t status;
@@ -729,7 +765,6 @@ - (void)calculateStats {
         VSLLogError(@"Stream is not active!");
     }
 
-
     VSLCallStats *callStats = [[VSLCallStats alloc] initWithCall: self];
     NSDictionary *stats = [callStats generate];
     if ([stats count] > 0) {
@@ -740,6 +775,7 @@ - (void)calculateStats {
 
         VSLLogDebug(@"activeCodec: %@ with MOS score: %f and MBs used: %f", self.activeCodec, self.MOS, self.totalMBsUsed);
     }
+    [self.audioCheckTimer invalidate];
 }
 
 - (NSString *)debugDescription {

Pod/Classes/VSLEndpoint.m

@@ -622,6 +622,7 @@ static void onRegState2(pjsua_acc_id acc_id, pjsua_reg_info *info) {
     if ([VSLEndpoint sharedEndpoint].ipChangeInProgress) {
         // When disableVideoSupport is on reinivite the calls again. And in the reinivite
         // disable the video stream. Otherwise the response is an 488 Not Acceptatble here.
+        // When videosupport has been disabled in the PBX.
         if ([VSLEndpoint sharedEndpoint].endpointConfiguration.disableVideoSupport) {
             VSLIpChangeConfiguration *ipChangeConfiguration = [VSLEndpoint sharedEndpoint].endpointConfiguration.ipChangeConfiguration;
             VSLAccount *account = [[VSLEndpoint sharedEndpoint] lookupAccount:acc_id];