115 lines
4.2 KiB
C
115 lines
4.2 KiB
C
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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//==============================================================================
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/**
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Wrapper class to continuously stream audio from an audio source to an
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AudioIODevice.
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This object acts as an AudioIODeviceCallback, so can be attached to an
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output device, and will stream audio from an AudioSource.
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@tags{Audio}
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*/
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class JUCE_API AudioSourcePlayer : public AudioIODeviceCallback
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{
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public:
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//==============================================================================
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/** Creates an empty AudioSourcePlayer. */
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AudioSourcePlayer();
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/** Destructor.
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Make sure this object isn't still being used by an AudioIODevice before
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deleting it!
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*/
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~AudioSourcePlayer() override;
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//==============================================================================
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/** Changes the current audio source to play from.
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If the source passed in is already being used, this method will do nothing.
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If the source is not null, its prepareToPlay() method will be called
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before it starts being used for playback.
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If there's another source currently playing, its releaseResources() method
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will be called after it has been swapped for the new one.
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@param newSource the new source to use - this will NOT be deleted
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by this object when no longer needed, so it's the
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caller's responsibility to manage it.
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*/
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void setSource (AudioSource* newSource);
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/** Returns the source that's playing.
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May return nullptr if there's no source.
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*/
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AudioSource* getCurrentSource() const noexcept { return source; }
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/** Sets a gain to apply to the audio data.
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@see getGain
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*/
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void setGain (float newGain) noexcept;
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/** Returns the current gain.
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@see setGain
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*/
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float getGain() const noexcept { return gain; }
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//==============================================================================
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/** Implementation of the AudioIODeviceCallback method. */
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void audioDeviceIOCallback (const float** inputChannelData,
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int totalNumInputChannels,
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float** outputChannelData,
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int totalNumOutputChannels,
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int numSamples) override;
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/** Implementation of the AudioIODeviceCallback method. */
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void audioDeviceAboutToStart (AudioIODevice* device) override;
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/** Implementation of the AudioIODeviceCallback method. */
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void audioDeviceStopped() override;
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/** An alternative method for initialising the source without an AudioIODevice. */
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void prepareToPlay (double sampleRate, int blockSize);
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private:
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//==============================================================================
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CriticalSection readLock;
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AudioSource* source = nullptr;
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double sampleRate = 0;
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int bufferSize = 0;
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float* channels[128];
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float* outputChans[128];
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const float* inputChans[128];
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AudioBuffer<float> tempBuffer;
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float lastGain = 1.0f;
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std::atomic<float> gain { 1.0f };
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioSourcePlayer)
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};
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} // namespace juce
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