87 lines
3.4 KiB
C++
87 lines
3.4 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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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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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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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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This class is used to wrap an AudioFormatReader and only read from a
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subsection of the file.
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So if you have a reader which can read a 1000 sample file, you could wrap it
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in one of these to only access, e.g. samples 100 to 200, and any samples
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outside that will come back as 0. Accessing sample 0 from this reader will
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actually read the first sample from the other's subsection, which might
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be at a non-zero position.
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@see AudioFormatReader
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@tags{Audio}
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*/
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class JUCE_API AudioSubsectionReader : public AudioFormatReader
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{
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public:
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//==============================================================================
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/** Creates an AudioSubsectionReader for a given data source.
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@param sourceReader the source reader from which we'll be taking data
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@param subsectionStartSample the sample within the source reader which will be
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mapped onto sample 0 for this reader.
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@param subsectionLength the number of samples from the source that will
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make up the subsection. If this reader is asked for
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any samples beyond this region, it will return zero.
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@param deleteSourceWhenDeleted if true, the sourceReader object will be deleted when
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this object is deleted.
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*/
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AudioSubsectionReader (AudioFormatReader* sourceReader,
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int64 subsectionStartSample,
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int64 subsectionLength,
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bool deleteSourceWhenDeleted);
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/** Destructor. */
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~AudioSubsectionReader() override;
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//==============================================================================
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bool readSamples (int** destSamples, int numDestChannels, int startOffsetInDestBuffer,
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int64 startSampleInFile, int numSamples) override;
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void readMaxLevels (int64 startSample, int64 numSamples,
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Range<float>* results, int numChannelsToRead) override;
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private:
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//==============================================================================
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AudioFormatReader* const source;
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int64 startSample, length;
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const bool deleteSourceWhenDeleted;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioSubsectionReader)
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};
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} // namespace juce
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