delay_time_varying.h

// Copyright (C) 2026 Alexandre St-Onge
// SPDX-License-Identifier: MIT
#pragma once
 
#include "sffdn/audio_buffer.h"
#include "sffdn/audio_processor.h"
#include "sffdn/delay_interp.h"
#include "sffdn/oscillator.h"
#include "sffdn/types.h"
 
#include <span>
#include <variant>
 
namespace sfFDN
{
 
class DelayTimeVarying : public AudioProcessor
{
  public:
    DelayTimeVarying(const DelayOptions& config);
 
    void Clear() override;
 
    void SetMaximumDelay(uint32_t delay);
 
    void SetDelay(float delay);
 
    float GetDelay() const;
 
    void SetMod(const ModulationOptions& options);
 
    float Tick(float input) noexcept SFFDN_NONBLOCKING;
 
    uint32_t InputChannelCount() const noexcept SFFDN_NONBLOCKING override;
 
    uint32_t OutputChannelCount() const noexcept SFFDN_NONBLOCKING override;
 
    void Process(const AudioBuffer& input, AudioBuffer& output) noexcept SFFDN_NONBLOCKING override;
 
    std::unique_ptr<AudioProcessor> Clone() const override;
 
  private:
    void UpdateDelay() noexcept SFFDN_NONBLOCKING;
    DelayInterp delay_;
    float base_delay_;
 
    SineWave lfo_;
};
 
} // namespace sfFDN