add ringtone (not well done, but still better than status quo)

res.qrc

@@ -123,6 +123,7 @@
         <file>ui/fileTransferInstance/emptyRGreenFileButton.png</file>
         <file>ui/fileTransferInstance/emptyRRedFileButton.png</file>
         <file>audio/notification.pcm</file>
+        <file>audio/ToxicIncomingCall.pcm</file>
         <file>img/settings/general.png</file>
         <file>img/settings/identity.png</file>
         <file>img/settings/privacy.png</file>

widget/widget.cpp

@@ -145,6 +145,7 @@ Widget::Widget(QWidget *parent)
     connect(core, &Core::groupMessageReceived, this, &Widget::onGroupMessageReceived);
     connect(core, &Core::groupNamelistChanged, this, &Widget::onGroupNamelistChanged);
     connect(core, &Core::emptyGroupCreated, this, &Widget::onEmptyGroupCreated);
+    connect(core, &Core::avInvite, this, &Widget::playRingtone);
 
     connect(core, SIGNAL(messageSentResult(int,QString,int)), this, SLOT(onMessageSendResult(int,QString,int)));
     connect(core, SIGNAL(groupSentResult(int,QString,int)), this, SLOT(onGroupSendResult(int,QString,int)));
@@ -535,6 +536,26 @@ void Widget::newMessageAlert()
     alSourcePlay(core->alMainSource);
 }
 
+void Widget::playRingtone()
+{
+    QApplication::alert(this);
+
+    static QFile sndFile1(":audio/ToxicIncomingCall.pcm"); // for whatever reason this plays slower/downshifted from what any other program plays the file as... but whatever
+    static QByteArray sndData1;
+    if (sndData1.isEmpty())
+    {
+        sndFile1.open(QIODevice::ReadOnly);
+        sndData1 = sndFile1.readAll();
+        sndFile1.close();
+    }
+
+    ALuint buffer;
+    alGenBuffers(1, &buffer);
+    alBufferData(buffer, AL_FORMAT_MONO16, sndData1.data(), sndData1.size(), 44100);
+    alSourcei(core->alMainSource, AL_BUFFER, buffer);
+    alSourcePlay(core->alMainSource);
+}
+
 void Widget::onFriendRequestReceived(const QString& userId, const QString& message)
 {
     FriendRequestDialog dialog(this, userId, message);

widget/widget.h

@@ -104,6 +104,7 @@ private slots:
     void setStatusBusy();
     void onMessageSendResult(int friendId, const QString& message, int messageId);
     void onGroupSendResult(int groupId, const QString& message, int result);
+    void playRingtone();
 
 private:
     void hideMainForms();