source/modules/juce_audio_formats/format/juce_AudioFormatReaderSource.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library.
   5    Copyright (c) 2022 - Raw Material Software Limited
   6
   7    JUCE is an open source library subject to commercial or open-source
   8    licensing.
   9
  10    By using JUCE, you agree to the terms of both the JUCE 7 End-User License
  11    Agreement and JUCE Privacy Policy.
  12
  13    End User License Agreement: www.juce.com/juce-7-licence
  14    Privacy Policy: www.juce.com/juce-privacy-policy
  15
  16    Or: You may also use this code under the terms of the GPL v3 (see
  17    www.gnu.org/licenses).
  18
  19    JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
  20    EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
  21    DISCLAIMED.
  22
  23   ==============================================================================
  24 */
  25
  26 namespace juce
  27 {
  28
  29 AudioFormatReaderSource::AudioFormatReaderSource (AudioFormatReader* const r,
  30                                                   const bool deleteReaderWhenThisIsDeleted)
  31     : reader (r, deleteReaderWhenThisIsDeleted),
  32       nextPlayPos (0),
  33       looping (false)
  34 {
  35     jassert (reader != nullptr);
  36 }
  37
  38 AudioFormatReaderSource::~AudioFormatReaderSource() {}
  39
  40 int64 AudioFormatReaderSource::getTotalLength() const                   { return reader->lengthInSamples; }
  41 void AudioFormatReaderSource::setNextReadPosition (int64 newPosition)   { nextPlayPos = newPosition; }
  42 void AudioFormatReaderSource::setLooping (bool shouldLoop)              { looping = shouldLoop; }
  43
  44 int64 AudioFormatReaderSource::getNextReadPosition() const
  45 {
  46     return looping ? nextPlayPos % reader->lengthInSamples
  47                    : nextPlayPos;
  48 }
  49
  50 void AudioFormatReaderSource::prepareToPlay (int /*samplesPerBlockExpected*/, double /*sampleRate*/) {}
  51 void AudioFormatReaderSource::releaseResources() {}
  52
  53 void AudioFormatReaderSource::getNextAudioBlock (const AudioSourceChannelInfo& info)
  54 {
  55     if (info.numSamples > 0)
  56     {
  57         const int64 start = nextPlayPos;
  58
  59         if (looping)
  60         {
  61             const int64 newStart = start % reader->lengthInSamples;
  62             const int64 newEnd = (start + info.numSamples) % reader->lengthInSamples;
  63
  64             if (newEnd > newStart)
  65             {
  66                 reader->read (info.buffer, info.startSample,
  67                               (int) (newEnd - newStart), newStart, true, true);
  68             }
  69             else
  70             {
  71                 const int endSamps = (int) (reader->lengthInSamples - newStart);
  72
  73                 reader->read (info.buffer, info.startSample,
  74                               endSamps, newStart, true, true);
  75
  76                 reader->read (info.buffer, info.startSample + endSamps,
  77                               (int) newEnd, 0, true, true);
  78             }
  79
  80             nextPlayPos = newEnd;
  81         }
  82         else
  83         {
  84             reader->read (info.buffer, info.startSample,
  85                           info.numSamples, start, true, true);
  86             nextPlayPos += info.numSamples;
  87         }
  88     }
  89 }
  90
  91 } // namespace juce