Add aging in the voice

src/sfizz/Synth.cpp

@@ -481,7 +481,7 @@ sfz::Voice* sfz::Synth::findFreeVoice() noexcept
 
     // Find voices that can be stolen
     absl::c_sort(voiceViewArray, [](Voice* lhs, Voice* rhs) {
-        return lhs->getMeanSquaredAverage() < rhs->getMeanSquaredAverage();
+        return lhs->getAverageEnvelope() < rhs->getAverageEnvelope();
     });
 
     voiceViewArray.front()->reset();

src/sfizz/Voice.cpp

@@ -240,7 +240,13 @@ void sfz::Voice::renderBlock(AudioSpan<float> buffer) noexcept
 
     updateChannelPowers(buffer);
 
-    this->triggerDelay = absl::nullopt;
+    age += buffer.getNumFrames();
+    if (triggerDelay) {
+        // Should be OK but just in case;
+        age = min(age - *triggerDelay, 0);
+        triggerDelay = absl::nullopt;
+    }
+
 #if 0
     ASSERT(!hasNanInf(buffer.getConstSpan(0)));
     ASSERT(!hasNanInf(buffer.getConstSpan(1)));
@@ -629,6 +635,7 @@ void sfz::Voice::reset() noexcept
     region = nullptr;
     currentPromise.reset();
     sourcePosition = 0;
+    age = 0;
     floatPositionOffset = 0.0f;
     noteIsOff = false;
 
@@ -642,7 +649,7 @@ void sfz::Voice::reset() noexcept
     equalizers.clear();
 }
 
-float sfz::Voice::getMeanSquaredAverage() const noexcept
+float sfz::Voice::getAverageEnvelope() const noexcept
 {
     return max(channelPowers[0], channelPowers[1]);
 }

src/sfizz/Voice.h

@@ -182,7 +182,7 @@ public:
      *
      * @return float
      */
-    float getMeanSquaredAverage() const noexcept;
+    float getAverageEnvelope() const noexcept;
     /**
      * @brief Get the position of the voice in the source, in samples
      *
@@ -215,6 +215,13 @@ public:
      */
     void release(int delay, bool fastRelease = false) noexcept;
 
+    /**
+     * @brief gets the age of the Voice
+     *
+     * @return
+     */
+    int getAge() const noexcept { return age; }
+
     Duration getLastDataDuration() const noexcept { return dataDuration; }
     Duration getLastAmplitudeDuration() const noexcept { return amplitudeDuration; }
     Duration getLastFilterDuration() const noexcept { return filterDuration; }
@@ -271,6 +278,7 @@ private:
     float floatPositionOffset { 0.0f };
     int sourcePosition { 0 };
     int initialDelay { 0 };
+    int age { 0 };
 
     FilePromisePtr currentPromise { nullptr };