JUCE/modules/juce_audio_utils/gui/juce_AudioAppComponent.cpp

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   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