Use a MixerAudioSource to play more than one file at a time

Monday 3 August 2020

1. Go to MainComponent.h and in private add:

juce::MixerAudioSource mixerSource;

2. We need to hook this into the Audio Life Cycle now. In MainComponent.cpp in MainComponent::prepareToPlay we add:

mixerSource.prepareToPlay(samplesPerBlockExpected, sampleRate);

3. We also need to set up player 2 in prepareToPlay because we haven't done that yet. So add

player2.prepareToPlay(samplesPerBlockExpected, sampleRate);

4. Then we need to add this in the same function:

mixerSource.addInputSource(&player1, false);
    mixerSource.addInputSource(&player2, false);

5. In MainComponent::getNextAudioBlock we replace player1.getNextAudioBlock(bufferToFill); with

mixerSource.getNextAudioBlock(bufferToFill);

We do this because we are delegating the responsibilty of dealing with player1 and player2 to mixerSource.

6. In MainComponent::releaseResources we put:

player1.releaseResources();
    player2.releaseResources();
    mixerSource.releaseResources();

although the worksheet said

    mixerSource.removeAllInputs();
    mixerSource.releaseResources();
    player1.releaseResources();
    player2.releaseResources();

All seems to be working after another compile and build.