JUCE/src/audio/audio_sources/juce_AudioFormatReaderSource.cpp

/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-11 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#include "../../core/juce_StandardHeader.h"

BEGIN_JUCE_NAMESPACE

#include "juce_AudioFormatReaderSource.h"


//==============================================================================
AudioFormatReaderSource::AudioFormatReaderSource (AudioFormatReader* const reader_,
                                                  const bool deleteReaderWhenThisIsDeleted)
    : reader (reader_),
      deleteReader (deleteReaderWhenThisIsDeleted),
      nextPlayPos (0),
      looping (false)
{
    jassert (reader != 0);
}

AudioFormatReaderSource::~AudioFormatReaderSource()
{
    releaseResources();

    if (deleteReader)
        delete reader;
}

void AudioFormatReaderSource::setNextReadPosition (int64 newPosition)
{
    nextPlayPos = newPosition;
}

void AudioFormatReaderSource::setLooping (bool shouldLoop)
{
    looping = shouldLoop;
}

int64 AudioFormatReaderSource::getNextReadPosition() const
{
    return looping ? nextPlayPos % reader->lengthInSamples
                   : nextPlayPos;
}

int64 AudioFormatReaderSource::getTotalLength() const
{
    return reader->lengthInSamples;
}

void AudioFormatReaderSource::prepareToPlay (int /*samplesPerBlockExpected*/,
                                             double /*sampleRate*/)
{
}

void AudioFormatReaderSource::releaseResources()
{
}

void AudioFormatReaderSource::getNextAudioBlock (const AudioSourceChannelInfo& info)
{
    if (info.numSamples > 0)
    {
        const int64 start = nextPlayPos;

        if (looping)
        {
            const int newStart = start % (int) reader->lengthInSamples;
            const int newEnd = (start + info.numSamples) % (int) reader->lengthInSamples;

            if (newEnd > newStart)
            {
                info.buffer->readFromAudioReader (reader,
                                                  info.startSample,
                                                  newEnd - newStart,
                                                  newStart,
                                                  true, true);
            }
            else
            {
                const int endSamps = (int) reader->lengthInSamples - newStart;

                info.buffer->readFromAudioReader (reader,
                                                  info.startSample,
                                                  endSamps,
                                                  newStart,
                                                  true, true);

                info.buffer->readFromAudioReader (reader,
                                                  info.startSample + endSamps,
                                                  newEnd,
                                                  0,
                                                  true, true);
            }

            nextPlayPos = newEnd;
        }
        else
        {
            info.buffer->readFromAudioReader (reader,
                                              info.startSample,
                                              info.numSamples,
                                              start,
                                              true, true);

            nextPlayPos += info.numSamples;
        }
    }
}

END_JUCE_NAMESPACE