Implement egN_ampeg

src/sfizz/FlexEGDescription.h

@@ -34,6 +34,8 @@ struct FlexEGDescription {
     int dynamic { Default::flexEGDynamic }; // whether parameters can be modulated while EG runs
     int sustain { Default::flexEGSustain }; // index of the sustain point (default to 0 in ARIA)
     std::vector<FlexEGPoint> points;
+    // ARIA
+    bool ampeg = false; // replaces the SFZv1 AmpEG (lowest with this bit wins)
 };
 
 } // namespace sfz

src/sfizz/FlexEnvelope.cpp

@@ -104,6 +104,25 @@ void FlexEnvelope::release(unsigned releaseDelay)
     impl.currentFramesUntilRelease_ = releaseDelay;
 }
 
+unsigned FlexEnvelope::getRemainingDelay() const noexcept
+{
+    const Impl& impl = *impl_;
+    return static_cast<unsigned>(impl.delayFramesLeft_);
+}
+
+bool FlexEnvelope::isReleased() const noexcept
+{
+    const Impl& impl = *impl_;
+    return impl.isReleased_;
+}
+
+bool FlexEnvelope::isFinished() const noexcept
+{
+    const Impl& impl = *impl_;
+    const FlexEGDescription& desc = *impl.desc_;
+    return impl.currentStageNumber_ >= desc.points.size();
+}
+
 void FlexEnvelope::process(absl::Span<float> out)
 {
     Impl& impl = *impl_;

src/sfizz/FlexEnvelope.h

@@ -40,6 +40,21 @@ public:
      */
     void release(unsigned releaseDelay);
 
+    /**
+       Get the remaining delay samples
+     */
+    unsigned getRemainingDelay() const noexcept;
+
+    /**
+       Is the envelope released?
+    */
+    bool isReleased() const noexcept;
+
+    /**
+       Is the envelope finished?
+    */
+    bool isFinished() const noexcept;
+
     /**
        Process a cycle of the generator.
      */

src/sfizz/Region.cpp

@@ -1162,6 +1162,28 @@ bool sfz::Region::parseOpcode(const Opcode& rawOpcode)
         LFO_EG_filter_EQ_target(ModId::Envelope, ModId::EqBandwidth, Default::eqBandwidthModRange);
         break;
 
+    case hash("eg&_ampeg"):
+    {
+        const auto egNumber = opcode.parameters.front();
+        if (egNumber == 0)
+            return false;
+        if (!extendIfNecessary(flexEGs, egNumber, Default::numFlexEGs))
+            return false;
+        if (auto value = readOpcode(opcode.value, Range<int> { 0, 1 })) {
+            FlexEGDescription& desc = flexEGs[egNumber - 1];
+            bool ampeg = *value != 0;
+            if (desc.ampeg != ampeg) {
+                desc.ampeg = ampeg;
+                flexAmpEG = absl::nullopt;
+                for (size_t i = 0, n = flexEGs.size(); i < n && !flexAmpEG; ++i) {
+                    if (flexEGs[i].ampeg)
+                        flexAmpEG = static_cast<uint8_t>(i);
+                }
+            }
+        }
+        break;
+    }
+
     // Amplitude Envelope
     case hash("ampeg_attack"):
     case hash("ampeg_decay"):
@@ -1907,7 +1929,7 @@ float sfz::Region::getBendInCents(float bend) const noexcept
     return bend > 0.0f ? bend * static_cast<float>(bendUp) : -bend * static_cast<float>(bendDown);
 }
 
-sfz::Region::Connection& sfz::Region::getOrCreateConnection(const ModKey& source, const ModKey& target)
+sfz::Region::Connection* sfz::Region::getConnection(const ModKey& source, const ModKey& target)
 {
     auto pred = [&source, &target](const Connection& c)
     {
@@ -1915,8 +1937,13 @@ sfz::Region::Connection& sfz::Region::getOrCreateConnection(const ModKey& source
     };
 
     auto it = std::find_if(connections.begin(), connections.end(), pred);
-    if (it != connections.end())
-        return *it;
+    return (it == connections.end()) ? nullptr : &*it;
+}
+
+sfz::Region::Connection& sfz::Region::getOrCreateConnection(const ModKey& source, const ModKey& target)
+{
+    if (Connection* c = getConnection(source, target))
+        return *c;
 
     sfz::Region::Connection c;
     c.source = source;

src/sfizz/Region.h

@@ -425,6 +425,7 @@ struct Region {
 
     // Envelopes
     std::vector<FlexEGDescription> flexEGs;
+    absl::optional<uint8_t> flexAmpEG; // egN_ampeg
 
     // LFOs
     std::vector<LFODescription> lfos;
@@ -445,6 +446,7 @@ struct Region {
         float velToDepth = 0.0f;
     };
     std::vector<Connection> connections;
+    Connection* getConnection(const ModKey& source, const ModKey& target);
     Connection& getOrCreateConnection(const ModKey& source, const ModKey& target);
 
     // Parent

src/sfizz/Synth.cpp

@@ -159,11 +159,6 @@ void sfz::Synth::buildRegion(const std::vector<Opcode>& regionOpcodes)
         ModKey::createCC(10, 1, defaultSmoothness, 100, 0),
         ModKey::createNXYZ(ModId::Pan, lastRegion->id)).sourceDepth = 1.0f;
 
-    // Create the amplitude envelope
-    lastRegion->getOrCreateConnection(
-        ModKey::createNXYZ(ModId::AmpEG, lastRegion->id),
-        ModKey::createNXYZ(ModId::Amplitude, lastRegion->id)).sourceDepth = 100.0f;
-
     //
     auto parseOpcodes = [&](const std::vector<Opcode>& opcodes) {
         for (auto& opcode : opcodes) {
@@ -182,6 +177,19 @@ void sfz::Synth::buildRegion(const std::vector<Opcode>& regionOpcodes)
     parseOpcodes(groupOpcodes);
     parseOpcodes(regionOpcodes);
 
+    // Create the amplitude envelope
+    if (!lastRegion->flexAmpEG) {
+        lastRegion->getOrCreateConnection(
+            ModKey::createNXYZ(ModId::AmpEG, lastRegion->id),
+            ModKey::createNXYZ(ModId::Amplitude, lastRegion->id)).sourceDepth = 100.0f;
+    }
+    else {
+        ModKey source = ModKey::createNXYZ(ModId::Envelope, lastRegion->id, *lastRegion->flexAmpEG);
+        ModKey target = ModKey::createNXYZ(ModId::Amplitude, lastRegion->id);
+        if (!lastRegion->getConnection(source, target))
+            lastRegion->getOrCreateConnection(source, target).sourceDepth = 100.0f;
+    }
+
     if (octaveOffset != 0 || noteOffset != 0)
         lastRegion->offsetAllKeys(octaveOffset * 12 + noteOffset);
 

src/sfizz/Voice.cpp

@@ -151,8 +151,13 @@ void sfz::Voice::release(int delay) noexcept
     if (state != State::playing)
         return;
 
-    if (egAmplitude.getRemainingDelay() > delay) {
-        switchState(State::cleanMeUp);
+    if (!region->flexAmpEG) {
+        if (egAmplitude.getRemainingDelay() > delay)
+            switchState(State::cleanMeUp);
+    }
+    else {
+        if (flexEGs[*region->flexAmpEG]->getRemainingDelay() > static_cast<unsigned>(delay))
+            switchState(State::cleanMeUp);
     }
 
     resources.modMatrix.releaseVoice(id, region->getId(), delay);
@@ -160,10 +165,15 @@ void sfz::Voice::release(int delay) noexcept
 
 void sfz::Voice::off(int delay) noexcept
 {
-    if (region->offMode == SfzOffMode::fast) {
-        egAmplitude.setReleaseTime( Default::offTime );
-    } else if (region->offMode == SfzOffMode::time) {
-        egAmplitude.setReleaseTime(region->offTime);
+    if (!region->flexAmpEG) {
+        if (region->offMode == SfzOffMode::fast) {
+            egAmplitude.setReleaseTime( Default::offTime );
+        } else if (region->offMode == SfzOffMode::time) {
+            egAmplitude.setReleaseTime(region->offTime);
+        }
+    }
+    else {
+        // TODO(jpc): Flex AmpEG
     }
 
     release(delay);
@@ -283,8 +293,14 @@ void sfz::Voice::renderBlock(AudioSpan<float> buffer) noexcept
         panStageMono(buffer);
     }
 
-    if (!egAmplitude.isSmoothing())
-        switchState(State::cleanMeUp);
+    if (!region->flexAmpEG) {
+        if (!egAmplitude.isSmoothing())
+            switchState(State::cleanMeUp);
+    }
+    else {
+        if (flexEGs[*region->flexAmpEG]->isFinished())
+            switchState(State::cleanMeUp);
+    }
 
     powerFollower.process(buffer);
 
@@ -569,8 +585,14 @@ void sfz::Voice::fillWithData(AudioSpan<float> buffer) noexcept
                         << " for sample " << region->sampleId);
                 }
 #endif
-                egAmplitude.setReleaseTime(0.0f);
-                egAmplitude.startRelease(i);
+                if (!region->flexAmpEG) {
+                    egAmplitude.setReleaseTime(0.0f);
+                    egAmplitude.startRelease(i);
+                }
+                else {
+                    // TODO(jpc): Flex AmpEG
+                    flexEGs[*region->flexAmpEG]->release(i);
+                }
                 fill<int>(indices->subspan(i), sampleEnd);
                 fill<float>(coeffs->subspan(i), 1.0f);
                 break;
@@ -850,7 +872,12 @@ float sfz::Voice::getAveragePower() const noexcept
 
 bool sfz::Voice::releasedOrFree() const noexcept
 {
-    return state != State::playing || egAmplitude.isReleased();
+    if (state != State::playing)
+        return true;
+    if (!region->flexAmpEG)
+        return egAmplitude.isReleased();
+    else
+        return flexEGs[*region->flexAmpEG]->isReleased();
 }
 
 uint32_t sfz::Voice::getSourcePosition() const noexcept