juce_AudioTransportSource.h

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/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
namespace juce
{
 
//==============================================================================
class JUCE_API  AudioTransportSource  : public PositionableAudioSource,
                                        public ChangeBroadcaster
{
public:
    //==============================================================================
    AudioTransportSource();

    ~AudioTransportSource() override;
 
    //==============================================================================
    void setSource (PositionableAudioSource* newSource,
                    int readAheadBufferSize = 0,
                    TimeSliceThread* readAheadThread = nullptr,
                    double sourceSampleRateToCorrectFor = 0.0,
                    int maxNumChannels = 2);
 
    //==============================================================================
    void setPosition (double newPosition);

    double getCurrentPosition() const;

    double getLengthInSeconds() const;

    bool hasStreamFinished() const noexcept;
 
    //==============================================================================
    void start();

    void stop();

    bool isPlaying() const noexcept     { return playing; }
 
    //==============================================================================
    void setGain (float newGain) noexcept;

    float getGain() const noexcept      { return gain; }
 
    //==============================================================================
    void prepareToPlay (int samplesPerBlockExpected, double sampleRate) override;

    void releaseResources() override;

    void getNextAudioBlock (const AudioSourceChannelInfo&) override;
 
    //==============================================================================
    void setNextReadPosition (int64 newPosition) override;

    int64 getNextReadPosition() const override;

    int64 getTotalLength() const override;

    bool isLooping() const override;
 
private:
    //==============================================================================
    PositionableAudioSource* source = nullptr;
    ResamplingAudioSource* resamplerSource = nullptr;
    BufferingAudioSource* bufferingSource = nullptr;
    PositionableAudioSource* positionableSource = nullptr;
    AudioSource* masterSource = nullptr;
 
    CriticalSection callbackLock;
    float gain = 1.0f, lastGain = 1.0f;
    std::atomic<bool> playing { false }, stopped { true };
    double sampleRate = 44100.0, sourceSampleRate = 0;
    int blockSize = 128, readAheadBufferSize = 0;
    bool isPrepared = false;
 
    void releaseMasterResources();
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioTransportSource)
};
 
} // namespace juce