juce_AudioSubsectionReader.cpp

/*
  ==============================================================================
 
   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.
 
   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.
 
   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-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
{
 
AudioSubsectionReader::AudioSubsectionReader (AudioFormatReader* sourceToUse,
                                              int64 startSampleToUse, int64 lengthToUse,
                                              bool deleteSource)
   : AudioFormatReader (nullptr, sourceToUse->getFormatName()),
     source (sourceToUse),
     startSample (startSampleToUse),
     deleteSourceWhenDeleted (deleteSource)
{
    length = jmin (jmax ((int64) 0, source->lengthInSamples - startSample), lengthToUse);
 
    sampleRate = source->sampleRate;
    bitsPerSample = source->bitsPerSample;
    lengthInSamples = length;
    numChannels = source->numChannels;
    usesFloatingPointData = source->usesFloatingPointData;
}
 
AudioSubsectionReader::~AudioSubsectionReader()
{
    if (deleteSourceWhenDeleted)
        delete source;
}
 
//==============================================================================
bool AudioSubsectionReader::readSamples (int* const* destSamples, int numDestChannels, int startOffsetInDestBuffer,
                                         int64 startSampleInFile, int numSamples)
{
    clearSamplesBeyondAvailableLength (destSamples, numDestChannels, startOffsetInDestBuffer,
                                       startSampleInFile, numSamples, length);
 
    if (numSamples <= 0)
        return true;
 
    return source->readSamples (destSamples, numDestChannels, startOffsetInDestBuffer,
                                startSampleInFile + startSample, numSamples);
}
 
void AudioSubsectionReader::readMaxLevels (int64 startSampleInFile, int64 numSamples, Range<float>* results, int numChannelsToRead)
{
    startSampleInFile = jmax ((int64) 0, startSampleInFile);
    numSamples = jmax ((int64) 0, jmin (numSamples, length - startSampleInFile));
 
    source->readMaxLevels (startSampleInFile + startSample, numSamples, results, numChannelsToRead);
}
 
} // namespace juce