Fix crash if call failed to start

src/core.h

@@ -185,6 +185,7 @@ signals:
     void avRequestTimeout(int friendId, int callIndex);
     void avPeerTimeout(int friendId, int callIndex);
     void avMediaChange(int friendId, int callIndex, bool videoEnabled);
+    void avCallFailed(int friendId);
 
     void videoFrameReceived(vpx_image* frame);
 

src/coreav.cpp

@@ -142,15 +142,32 @@ void Core::startCall(int friendId, bool video)
     {
         qDebug() << QString("Core: Starting new call with %1 with video").arg(friendId);
         cSettings.call_type = TypeVideo;
-        toxav_call(toxav, &callId, friendId, &cSettings, TOXAV_RINGING_TIME);
-        calls[callId].videoEnabled=true;
+        if (toxav_call(toxav, &callId, friendId, &cSettings, TOXAV_RINGING_TIME) == 0)
+        {
+            calls[callId].videoEnabled=true;
+        }
+        else
+        {
+            qWarning() << QString("Core: Failed to start new video call with %1").arg(friendId);
+            emit avCallFailed(friendId);
+            return;
+        }
     }
     else
     {
         qDebug() << QString("Core: Starting new call with %1 without video").arg(friendId);
         cSettings.call_type = TypeAudio;
-        toxav_call(toxav, &callId, friendId, &cSettings, TOXAV_RINGING_TIME);
-        calls[callId].videoEnabled=false;
+        if (toxav_call(toxav, &callId, friendId, &cSettings, TOXAV_RINGING_TIME) == 0)
+        {
+            calls[callId].videoEnabled=false;
+        }
+        else
+        {
+            qWarning() << QString("Core: Failed to start new audio call with %1").arg(friendId);
+            emit avCallFailed(friendId);
+            return;
+        }
+
     }
 }
 

src/widget/form/chatform.cpp

@@ -459,6 +459,18 @@ void ChatForm::onVideoCallTriggered()
     emit startVideoCall(f->friendId, true);
 }
 
+void ChatForm::onAvCallFailed(int FriendId)
+{
+    if (FriendId != f->friendId)
+        return;
+
+    audioInputFlag = false;
+    callButton->disconnect();
+    videoButton->disconnect();
+    connect(callButton, SIGNAL(clicked()), this, SLOT(onCallTriggered()));
+    connect(videoButton, SIGNAL(clicked()), this, SLOT(onVideoCallTriggered()));
+}
+
 void ChatForm::onCancelCallTriggered()
 {
     audioInputFlag = false;

src/widget/form/chatform.h

@@ -55,6 +55,7 @@ public slots:
     void onAvRequestTimeout(int FriendId, int CallId);
     void onAvPeerTimeout(int FriendId, int CallId);
     void onAvMediaChange(int FriendId, int CallId, bool video);
+    void onAvCallFailed(int FriendId);
     void onMicMuteToggle();
     void onAvatarChange(int FriendId, const QPixmap& pic);
     void onAvatarRemoved(int FriendId);

src/widget/widget.cpp

@@ -620,6 +620,7 @@ void Widget::addFriend(int friendId, const QString &userId)
     connect(core, &Core::avRequestTimeout, newfriend->chatForm, &ChatForm::onAvRequestTimeout);
     connect(core, &Core::avPeerTimeout, newfriend->chatForm, &ChatForm::onAvPeerTimeout);
     connect(core, &Core::avMediaChange, newfriend->chatForm, &ChatForm::onAvMediaChange);
+    connect(core, &Core::avCallFailed, newfriend->chatForm, &ChatForm::onAvCallFailed);
     connect(core, &Core::friendAvatarChanged, newfriend->chatForm, &ChatForm::onAvatarChange);
     connect(core, &Core::friendAvatarChanged, newfriend->widget, &FriendWidget::onAvatarChange);
     connect(core, &Core::friendAvatarRemoved, newfriend->chatForm, &ChatForm::onAvatarRemoved);