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111 lines
4.7 KiB
111 lines
4.7 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_BUFFERINGAUDIOSOURCE_H_INCLUDED
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#define JUCE_BUFFERINGAUDIOSOURCE_H_INCLUDED
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//==============================================================================
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/**
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An AudioSource which takes another source as input, and buffers it using a thread.
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Create this as a wrapper around another thread, and it will read-ahead with
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a background thread to smooth out playback. You can either create one of these
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directly, or use it indirectly using an AudioTransportSource.
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@see PositionableAudioSource, AudioTransportSource
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*/
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class JUCE_API BufferingAudioSource : public PositionableAudioSource,
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private TimeSliceClient
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{
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public:
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//==============================================================================
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/** Creates a BufferingAudioSource.
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@param source the input source to read from
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@param backgroundThread a background thread that will be used for the
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background read-ahead. This object must not be deleted
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until after any BufferedAudioSources that are using it
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have been deleted!
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@param deleteSourceWhenDeleted if true, then the input source object will
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be deleted when this object is deleted
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@param numberOfSamplesToBuffer the size of buffer to use for reading ahead
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@param numberOfChannels the number of channels that will be played
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*/
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BufferingAudioSource (PositionableAudioSource* source,
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TimeSliceThread& backgroundThread,
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bool deleteSourceWhenDeleted,
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int numberOfSamplesToBuffer,
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int numberOfChannels = 2);
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/** Destructor.
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The input source may be deleted depending on whether the deleteSourceWhenDeleted
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flag was set in the constructor.
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*/
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~BufferingAudioSource();
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//==============================================================================
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/** Implementation of the AudioSource method. */
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void prepareToPlay (int samplesPerBlockExpected, double sampleRate) override;
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/** Implementation of the AudioSource method. */
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void releaseResources() override;
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/** Implementation of the AudioSource method. */
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void getNextAudioBlock (const AudioSourceChannelInfo&) override;
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//==============================================================================
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/** Implements the PositionableAudioSource method. */
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void setNextReadPosition (int64 newPosition) override;
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/** Implements the PositionableAudioSource method. */
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int64 getNextReadPosition() const override;
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/** Implements the PositionableAudioSource method. */
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int64 getTotalLength() const override { return source->getTotalLength(); }
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/** Implements the PositionableAudioSource method. */
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bool isLooping() const override { return source->isLooping(); }
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private:
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//==============================================================================
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OptionalScopedPointer<PositionableAudioSource> source;
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TimeSliceThread& backgroundThread;
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int numberOfSamplesToBuffer, numberOfChannels;
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AudioSampleBuffer buffer;
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CriticalSection bufferStartPosLock;
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int64 volatile bufferValidStart, bufferValidEnd, nextPlayPos;
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double volatile sampleRate;
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bool wasSourceLooping, isPrepared;
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bool readNextBufferChunk();
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void readBufferSection (int64 start, int length, int bufferOffset);
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int useTimeSlice() override;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BufferingAudioSource)
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};
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#endif // JUCE_BUFFERINGAUDIOSOURCE_H_INCLUDED
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