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/**********************************************************************
Audacity: A Digital Audio Editor
@file SampleTrackSource.h
@brief Adapter of SampleTrack to the interface AudioGraph::Source
Dominic Mazzoni
Vaughan Johnson
Paul Licameli split from PerTrackEffect.h
**********************************************************************/
#ifndef __AUDACITY_SAMPLE_TRACK_SOURCE__
#define __AUDACITY_SAMPLE_TRACK_SOURCE__
#include "AudioGraphSource.h" // to inherit
#include "SampleCount.h"
#include <functional>
class SampleTrack;
//! Adapts SampleTrack to the interface AudioGraph::Source
class SAMPLE_TRACK_API SampleTrackSource final : public AudioGraph::Source {
public:
//! Type of function returning false if user cancels progress
using Poller = std::function<bool(sampleCount blockSize)>;
/*!
@post `Remaining()` == len
*/
SampleTrackSource(const SampleTrack &left, const SampleTrack *pRight,
sampleCount start, sampleCount len, Poller pollUser);
~SampleTrackSource() override;
//! If constructed with positive length, then accepts buffers only when
//! number of channels is positive
bool AcceptsBuffers(const Buffers &buffers) const override;
//! Always true
bool AcceptsBlockSize(size_t blockSize) const override;
std::optional<size_t> Acquire(Buffers &data, size_t bound) override;
sampleCount Remaining() const override;
//! Can test for user cancellation
bool Release() override;
private:
const SampleTrack &mLeft;
const SampleTrack *const mpRight;
const Poller mPollUser;
sampleCount mPos{};
sampleCount mOutputRemaining{};
size_t mLastProduced{};
size_t mFetched{};
bool mInitialized{ false };
};
#endif
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