Play multi audio files at the same time

General JUCE discussion
1

Hi Juce community!

 

I'm looking for to play more than one file at the same time and do some stuff with their buffer (like changing the gain). But I don't know how to do it.

What is the method to do it ?

1°) Do I have to use N-AudioTransportSource to play N tracks? Or do I have to use MixerAudioSource?

2°) When the AudioTransportSource will start, the getNextAudioBlock() method will be called. How do I manage to know where buffer belong to a particular AudioTransportSource?

 

I'm totally lost, so if you could give a little exemple it will be nice.

1 Like
2

Hi. I have the same problem, may someone know solution ? Especially how to get in: void getNextAudioBlock(const AudioSourceChannelInfo& bufferToFill) access to each channel from mixer to be able manipulate each in separate way. For example to change volume…

3

If you are using AudioTransportSource objects with a MixerAudioSource you can use the AudioTransportSource::setGain() method to change the volume of a source whilst it is being mixed. However if you’re using a custom AudioSource object then you should do your processing in its getNextAudioBlock() method as MixerAudioSource just iterates over each of its AudioSources and calls this.

4

Thanks for response. My code now is:

audioTransportSource = new AudioTransportSource;
audioTransportSource->setSource(new AudioFormatReaderSource(audioFormatReader, true));
audioMixer.addInputSource(audioTransportSource, true);
audioTransportSource->setGain(0.5);

But I have somewhere error in my conception because it doesn’t work.

Previously was only:

audioMixer.addInputSource(new AudioFormatReaderSource(audioFormatReader, true), true);

and worked.

5

I forget about: audioTransportSource->start();
So now works, thank you for help ! :slight_smile:

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