JUCE/modules/juce_audio_utils/gui/juce_AudioAppComponent.cpp

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

   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
{

AudioAppComponent::AudioAppComponent()
    : deviceManager (defaultDeviceManager),
      usingCustomDeviceManager (false)
{
}

AudioAppComponent::AudioAppComponent (AudioDeviceManager& adm)
    : deviceManager (adm),
      usingCustomDeviceManager (true)
{
}

AudioAppComponent::~AudioAppComponent()
{
    // If you hit this then your derived class must call shutdown audio in
    // destructor!
    jassert (audioSourcePlayer.getCurrentSource() == nullptr);
}

void AudioAppComponent::setAudioChannels (int numInputChannels, int numOutputChannels, const XmlElement* const xml)
{
    String audioError;

    if (usingCustomDeviceManager && xml == nullptr)
    {
        auto setup = deviceManager.getAudioDeviceSetup();

        if (setup.inputChannels.countNumberOfSetBits() != numInputChannels
             || setup.outputChannels.countNumberOfSetBits() != numOutputChannels)
        {
            setup.inputChannels.clear();
            setup.outputChannels.clear();

            setup.inputChannels.setRange (0, numInputChannels, true);
            setup.outputChannels.setRange (0, numOutputChannels, true);

            audioError = deviceManager.setAudioDeviceSetup (setup, false);
        }
    }
    else
    {
        audioError = deviceManager.initialise (numInputChannels, numOutputChannels, xml, true);
    }

    jassert (audioError.isEmpty());

    deviceManager.addAudioCallback (&audioSourcePlayer);
    audioSourcePlayer.setSource (this);
}

void AudioAppComponent::shutdownAudio()
{
    audioSourcePlayer.setSource (nullptr);
    deviceManager.removeAudioCallback (&audioSourcePlayer);

    // other audio callbacks may still be using the device
    if (! usingCustomDeviceManager)
        deviceManager.closeAudioDevice();
}

} // namespace juce