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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#ifndef SV_EFFECT_WRAPPER_H
#define SV_EFFECT_WRAPPER_H
#include "bqaudioio/ApplicationPlaybackSource.h"
#include "base/BaseTypes.h"
#include "base/RingBuffer.h"
#include "plugin/RealTimePluginInstance.h"
#include <vector>
#include <mutex>
#include <memory>
namespace sv {
/**
* A breakfastquay::ApplicationPlaybackSource wrapper that applies a
* real-time effect plugin.
*/
class EffectWrapper : public breakfastquay::ApplicationPlaybackSource
{
public:
/**
* Create a wrapper around the given ApplicationPlaybackSource,
* implementing another ApplicationPlaybackSource interface that
* draws from the same source data but with an effect optionally
* applied.
*
* The wrapper does not take ownership of the wrapped
* ApplicationPlaybackSource, whose lifespan must exceed that of
* this object.
*/
EffectWrapper(ApplicationPlaybackSource *source);
~EffectWrapper();
/**
* Set the effect to apply. The effect instance is shared with the
* caller: the expectation is that the caller may continue to
* modify its parameters etc during auditioning. Replaces any
* instance previously set.
*/
void setEffect(std::weak_ptr<RealTimePluginInstance>);
/**
* Return true if an effect is currently set to be applied.
*/
bool haveEffect() const;
/**
* Remove any applied effect without setting another one.
*/
void clearEffect();
/**
* Bypass or un-bypass the effect.
*/
void setBypassed(bool bypassed);
/**
* Return true if the effect is bypassed.
*/
bool isBypassed() const;
/**
* Clear any buffered data.
*/
void reset();
// These functions are passed through to the wrapped
// ApplicationPlaybackSource
std::string getClientName() const override;
int getApplicationSampleRate() const override;
int getApplicationChannelCount() const override;
void setSystemPlaybackBlockSize(int) override;
void setSystemPlaybackSampleRate(int) override;
void setSystemPlaybackChannelCount(int) override;
void setSystemPlaybackLatency(int) override;
void setOutputLevels(float peakLeft, float peakRight) override;
void audioProcessingOverload() override;
/**
* Request some samples from the wrapped
* ApplicationPlaybackSource, apply effect if set, and return them
* to the target
*/
int getSourceSamples(float *const *samples, int nchannels, int nframes)
override;
private:
ApplicationPlaybackSource *m_source;
std::weak_ptr<RealTimePluginInstance> m_effect;
bool m_bypassed;
bool m_failed;
int m_channelCount;
std::vector<RingBuffer<float>> m_effectOutputBuffers;
mutable std::mutex m_mutex;
EffectWrapper(const EffectWrapper &)=delete;
EffectWrapper &operator=(const EffectWrapper &)=delete;
};
} // end namespace sv
#endif
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