Reset the smoothers

src/sfizz/BeatClock.cpp

@@ -157,6 +157,12 @@ absl::Span<const float> BeatClock::getRunningBeatPosition()
     return absl::MakeConstSpan(runningBeatPosition_.data(), currentCycleFrames_);
 }
 
+float BeatClock::getLastBeatPosition() const
+{
+    double beats = lastClientPos_.toBeats(timeSig_);
+    return static_cast<float>(beats);
+}
+
 absl::Span<const int> BeatClock::getRunningBeatsPerBar()
 {
     fillBufferUpTo(currentCycleFrames_);
@@ -175,32 +181,35 @@ void BeatClock::fillBufferUpTo(unsigned delay)
     for (unsigned i = fillIdx; i < delay; ++i)
         beatsPerBarData[i] = sig.beatsPerBar;
 
-    if (!isPlaying_) {
-        if (fillIdx < delay) {
-            fill(absl::MakeSpan(&beatNumberData[fillIdx], delay - fillIdx), 0);
-            fill(absl::MakeSpan(&beatNumberPosition[fillIdx], delay - fillIdx), 0.0f);
-        }
-        currentCycleFill_ = fillIdx;
-        return;
-    }
-
     BBT clientPos = lastClientPos_;
-    const double beatsPerFrame = beatsPerSecond_ * samplePeriod_;
-
     const BBT hostPos = lastHostPos_;
     bool mustApplyHostPos = mustApplyHostPos_;
 
-    for (; fillIdx < delay; ++fillIdx) {
-        clientPos = BBT::fromBeats(sig, clientPos.toBeats(sig) + beatsPerFrame);
+    if (!isPlaying_) {
         clientPos = mustApplyHostPos ? hostPos : clientPos;
         mustApplyHostPos = false;
 
-        // quantization to nearest for prevention of rounding errors
-        double beats = clientPos.toBeats(sig);
-        beatNumberData[fillIdx] = dequantize<int>(quantize(beats));
-        beatNumberPosition[fillIdx] = static_cast<float>(beats);
+        if (fillIdx < delay) {
+            double beats = clientPos.toBeats(sig);
+            // quantization to nearest for prevention of rounding errors
+            fill(absl::MakeSpan(&beatNumberData[fillIdx], delay - fillIdx), dequantize<int>(quantize(beats)));
+            fill(absl::MakeSpan(&beatNumberPosition[fillIdx], delay - fillIdx), static_cast<float>(beats));
+            fillIdx = delay;
+        }
+    } else {
+        for (; fillIdx < delay; ++fillIdx) {
+            clientPos = BBT::fromBeats(sig, clientPos.toBeats(sig) + getBeatsPerFrame());
+            clientPos = mustApplyHostPos ? hostPos : clientPos;
+            mustApplyHostPos = false;
+
+            // quantization to nearest for prevention of rounding errors
+            double beats = clientPos.toBeats(sig);
+            beatNumberData[fillIdx] = dequantize<int>(quantize(beats));
+            beatNumberPosition[fillIdx] = static_cast<float>(beats);
+        }
     }
 
+
     currentCycleFill_ = fillIdx;
     lastClientPos_ = clientPos;
     mustApplyHostPos_ = mustApplyHostPos;

src/sfizz/BeatClock.h

@@ -102,6 +102,11 @@ public:
      * @brief Set the time signature.
      */
     void setTimeSignature(unsigned delay, TimeSignature newSig);
+    /**
+     * @brief Get the time signature
+     *
+     */
+    TimeSignature getTimeSignature() const noexcept { return timeSig_; }
     /**
      * @brief Set the time position.
      */
@@ -134,6 +139,19 @@ public:
      * @brief Get the time signature numerator for each frame of the current cycle.
      */
     absl::Span<const int> getRunningBeatsPerBar();
+
+    /**
+     * @brief Get the last BeatPosition
+     *
+     * @return float
+     */
+    float getLastBeatPosition() const;
+    /**
+     * @brief Get the Beats Per Frame object
+     *
+     * @return float
+     */
+    double getBeatsPerFrame() const { return beatsPerSecond_ * samplePeriod_; }
     /**
      * @brief Create a normalized phase signal for LFO which completes a
      *        period every N-th beat.

src/sfizz/MidiState.cpp

@@ -57,21 +57,27 @@ void sfz::MidiState::setSampleRate(float sampleRate) noexcept
 
 void sfz::MidiState::advanceTime(int numSamples) noexcept
 {
-    auto clearEvents = [] (EventVector& events) {
+    internalClock += numSamples;
+    flushEvents();
+}
+
+void sfz::MidiState::flushEvents() noexcept
+{
+    auto flushEventVector = [] (EventVector& events) {
         ASSERT(!events.empty()); // CC event vectors should never be empty
         events.front().value = events.back().value;
         events.front().delay = 0;
         events.resize(1);
     };
 
-    internalClock += numSamples;
     for (auto& ccEvents : cc)
-        clearEvents(ccEvents);
+        flushEventVector(ccEvents);
 
-    clearEvents(pitchEvents);
-    clearEvents(channelAftertouchEvents);
+    flushEventVector(pitchEvents);
+    flushEventVector(channelAftertouchEvents);
 }
 
+
 void sfz::MidiState::setSamplesPerBlock(int samplesPerBlock) noexcept
 {
     auto updateEventBufferSize = [=] (EventVector& events) {
@@ -113,7 +119,7 @@ float sfz::MidiState::getLastVelocity() const noexcept
 
 void sfz::MidiState::insertEventInVector(EventVector& events, int delay, float value)
 {
-    const auto insertionPoint = absl::c_upper_bound(events, delay, MidiEventDelayComparator {});
+    const auto insertionPoint = absl::c_lower_bound(events, delay, MidiEventDelayComparator {});
     if (insertionPoint == events.end() || insertionPoint->delay != delay)
         events.insert(insertionPoint, { delay, value });
     else

src/sfizz/MidiState.h

@@ -130,11 +130,18 @@ public:
     /**
      * @brief Advances the internal clock of a given amount of samples.
      * You should call this at each callback. This will flush the events
-     * in the midistate memory.
+     * in the midistate memory by calling flushEvents().
      *
      * @param numSamples the number of samples of clock advance
      */
     void advanceTime(int numSamples) noexcept;
+
+    /**
+     * @brief Flush events in all states, keeping only the last one as the "base" state
+     *
+     */
+    void flushEvents() noexcept;
+
     /**
      * @brief Get the CC value for CC number
      *

src/sfizz/Synth.cpp

@@ -258,6 +258,7 @@ void Synth::Impl::clear()
     groupOpcodes_.clear();
     unknownOpcodes_.clear();
     modificationTime_ = absl::nullopt;
+    playheadMoved_ = false;
 
     // set default controllers
     // midistate is reset above
@@ -913,6 +914,12 @@ void Synth::renderBlock(AudioSpan<float> buffer) noexcept
     BeatClock& bc = impl.resources_.beatClock;
     bc.beginCycle(numFrames);
 
+    if (impl.playheadMoved_ && impl.resources_.beatClock.isPlaying()) {
+        impl.resources_.midiState.flushEvents();
+        impl.genController_->resetSmoothers();
+        impl.playheadMoved_ = false;
+    }
+
     { // Clear effect busses
         ScopedTiming logger { callbackBreakdown.effects };
         for (auto& bus : impl.effectBuses_) {
@@ -1301,7 +1308,16 @@ void Synth::timePosition(int delay, int bar, double barBeat)
     Impl& impl = *impl_;
     ScopedTiming logger { impl.dispatchDuration_, ScopedTiming::Operation::addToDuration };
 
-    impl.resources_.beatClock.setTimePosition(delay, BBT(bar, barBeat));
+    const auto newPosition = BBT(bar, barBeat);
+    const auto newBeatPosition = newPosition.toBeats(impl.resources_.beatClock.getTimeSignature());
+    const auto currentBeatPosition = impl.resources_.beatClock.getLastBeatPosition();
+    const auto positionDifference = std::abs(newBeatPosition - currentBeatPosition);
+    const auto threshold = 2 * static_cast<float>(impl.resources_.beatClock.getBeatsPerFrame());
+
+    if (positionDifference > threshold)
+        impl.playheadMoved_ = true;
+
+    impl.resources_.beatClock.setTimePosition(delay, newPosition);
 }
 
 void Synth::playbackState(int delay, int playbackState)

src/sfizz/SynthPrivate.h

@@ -309,6 +309,8 @@ struct Synth::Impl final: public Parser::Listener {
         client.setReceiveCallback(broadcastReceiver);
         return client;
     }
+
+    bool playheadMoved_ { false };
 };
 
 } // namespace sfz

src/sfizz/modulations/sources/Controller.cpp

@@ -16,6 +16,7 @@
 namespace sfz {
 
 struct ControllerSource::Impl {
+    float getLastTransformedValue(uint16_t cc, uint8_t curve) const noexcept;
     double sampleRate_ = config::defaultSampleRate;
     Resources* res_ = nullptr;
     absl::flat_hash_map<ModKey, Smoother> smoother_;
@@ -31,6 +32,22 @@ ControllerSource::~ControllerSource()
 {
 }
 
+float ControllerSource::Impl::getLastTransformedValue(uint16_t cc, uint8_t curveIndex) const noexcept
+{
+    ASSERT(res_);
+    const Curve& curve = res_->curves.getCurve(curveIndex);
+    const auto lastCCValue = res_->midiState.getCCValue(cc);
+    return curve.evalNormalized(lastCCValue);
+}
+
+void ControllerSource::resetSmoothers()
+{
+    for (auto& item : impl_->smoother_) {
+        const ModKey::Parameters p = item.first.parameters();
+        item.second.reset(impl_->getLastTransformedValue(p.cc, p.curve));
+    }
+}
+
 void ControllerSource::setSampleRate(double sampleRate)
 {
     if (impl_->sampleRate_ == sampleRate)
@@ -58,6 +75,7 @@ void ControllerSource::init(const ModKey& sourceKey, NumericId<Voice> voiceId, u
     if (p.smooth > 0) {
         Smoother s;
         s.setSmoothing(p.smooth, impl_->sampleRate_);
+        s.reset(impl_->getLastTransformedValue(p.cc, p.curve));
         impl_->smoother_[sourceKey] = s;
     }
     else {

src/sfizz/modulations/sources/Controller.h

@@ -21,6 +21,10 @@ public:
     void init(const ModKey& sourceKey, NumericId<Voice> voiceId, unsigned delay) override;
     void generate(const ModKey& sourceKey, NumericId<Voice> voiceId, absl::Span<float> buffer) override;
 
+    /**
+     * @brief Reset the smoothers.
+     */
+    void resetSmoothers();
 private:
     struct Impl;
     std::unique_ptr<Impl> impl_;