Add detune parameter to AudioBufferSourceNode about labsound HOT 3 CLOSED

 double AudioBufferSourceHandler::computePlaybackRate()
 {
-    double dopplerRate = 1.0;
+    double dopplerRate = 1;
     if (m_pannerNode)
         dopplerRate = m_pannerNode->dopplerRate();
 
@@ -498,6 +499,9 @@
 
     double finalPlaybackRate = dopplerRate * sampleRateFactor * basePlaybackRate;
 
+    // Take the detune value into account for the final playback rate.
+    finalPlaybackRate *= pow(2, m_detune->finalValue() / 1200);
+
     // Sanity check the total rate.  It's very important that the resampler not
     // get any bad rate values.
     finalPlaybackRate = clampTo(finalPlaybackRate, 0.0, MaxRate);