Class ADSRNode::ADSRNodeImpl

src/extended/ADSRNode.cpp:39–183

    }

    class ADSRNode::ADSRNodeImpl : public lab::AudioProcessor
    {
    public:
        float cached_sample_rate = 48000.f;   // typical default
        struct LerpTarget { float t, dvdt; };
        std:: deque<LerpTarget> _lerp;

        ADSRNodeImpl() : AudioProcessor()
        {
            envelope.reserve(AudioNode::ProcessingSizeInFrames * 4);
        }

        virtual ~ADSRNodeImpl() {}

        virtual void initialize() override { }
        virtual void uninitialize() override { }

        // Processes the source to destination bus. The number of channels must match in source and destination.
        virtual void process(ContextRenderLock & r, const lab::AudioBus * sourceBus, lab::AudioBus* destinationBus, int framesToProcess) override
        {
            using std::deque;

            if (!destinationBus->numberOfChannels())
                return;

            if (!sourceBus->numberOfChannels())
            {
                destinationBus->zero();
                return;
            }

            if (framesToProcess != _gateArray.size()) 
                _gateArray.resize(framesToProcess);
            if (envelope.size() != framesToProcess)
                envelope.resize(framesToProcess);

            // scan the gate signal
            const bool gate_is_connected = m_gate->hasSampleAccurateValues();
            if (gate_is_connected)
            {
                m_gate->calculateSampleAccurateValues(r, _gateArray.data(), framesToProcess);

                // threshold the gate to on or off
                for (int i = 0; i < framesToProcess; ++i)
                    _gateArray[i] = _gateArray[i] > 0 ? 1.f : 0.f;
            }
            else
            {
                float g = m_gate->value();
                // threshold the gate to on or off
                for (int i = 0; i < framesToProcess; ++i)
                    _gateArray[i] = g > 0 ? 1.f : 0.f;
            }

            // oneshot == false means gate controls Attack/Sustain
            // oneshot == true means sustain param controls sustain
            bool oneshot = m_oneShot->valueBool();