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