SampleRate: Add operator for dividing by another sample rate

src/audio/types.h

@@ -165,12 +165,21 @@ class SampleRate {
         return SampleRate(static_cast<value_t>(value));
     }
 
+    constexpr double toDouble() {
+        return static_cast<double>(value());
+    }
+
   private:
     value_t m_value;
 };
 
 QDebug operator<<(QDebug dbg, SampleRate arg);
 
+/// Division of a SampleRate by another SampleRate returns a ratio as double.
+inline double operator/(SampleRate sampleRate1, SampleRate sampleRate2) {
+    return sampleRate1.toDouble() / sampleRate2.toDouble();
+}
+
 // The bitrate is measured in kbit/s (kbps) and provides information
 // about the level of compression for lossily encoded audio streams.
 //

src/engine/enginebuffer.cpp

@@ -809,7 +809,7 @@ void EngineBuffer::processTrackLocked(
 
     double baserate = 0.0;
     if (sampleRate.isValid()) {
-        baserate = static_cast<double>(m_trackSampleRateOld) / sampleRate;
+        baserate = m_trackSampleRateOld / sampleRate;
     }
 
     // Sync requests can affect rate, so process those first.