Issue simply write to output buffer

General JUCE discussion
1

Hello y’all,
I’m currently learning how to use juce and it’s whole features, and have done the whole bunch of tutorials presents on the website. As I wanted to start making thinks by myself, I tried to create a metronome that could play sound on a regular time basis.
After some struggles, I managed to get something that works, but unfortunately, only with syn wave. As I send the bufferToFill from the getNextAudioBlock function to another one for it to be fullfilled, no sound output. (I stole this part of the code from a tutorial that works on his own, so I don’t understand anything…). Here the code executed when trying to play the sample :

	juce::AudioFormatManager formatManager;
	std::unique_ptr<juce::AudioFormatReaderSource> readerSource;
	std::unique_ptr<juce::AudioFormatReaderSource> readerSource2;
	juce::AudioTransportSource transportSource;
	juce::AudioTransportSource transportSource2;

//two transport source because two differents sounds one for the hard click and the other for the slow one

	void openButtonDownClicked()
	{
		chooser = std::make_unique<juce::FileChooser>("Choisis un son en Wav pour le milieu de mesure mon reuf",
			juce::File{},
			"*.wav");
		auto chooserFlags = juce::FileBrowserComponent::openMode
			| juce::FileBrowserComponent::canSelectFiles;

		chooser->launchAsync(chooserFlags, [this](const FileChooser& fc)
		{
			auto file = fc.getResult();

			if (file != File{})
			{
				auto* reader = formatManager.createReaderFor(file);

				if (reader != nullptr)
				{
					auto newSource = std::make_unique<juce::AudioFormatReaderSource>(reader, true);
					transportSource2.setSource(newSource.get(), 0, nullptr, reader->sampleRate);
					readerSource2.reset(newSource.release());
				}
			}
		});
	}

//This is the function used to load the files I think that this one works correctly


	void getNextAudioBlock(const juce::AudioSourceChannelInfo& bufferToFill) override
	{
		if (AudioSample.getToggleState() == true)
		{
			playsoundsample(bufferToFill);
			return;
		}
//... During execution, it greatly goes there so I think It's okay

	void playsoundsample(const juce::AudioSourceChannelInfo& bufferToFill) 
	{
		if (readerSource.get() == nullptr)
		{
			bufferToFill.clearActiveBufferRegion();
			return;
		}

		transportSource.getNextAudioBlock(bufferToFill);
		return;
	}
//then I try to write in the buffer and nothing happen...

If anybody has any clue, even little, I’ll be very greatefull !

2

You are using two transport sources, to playback two audio files.
I don’t think that will work as intended.
TransportSources are roughly a class to playback a file from disk.

What I would do, is to load the two audio files into two audiobuffer members at construction (or when loading the files) using for instance your

auto* reader....

These can then be mixed with the supplied buffer in your getNextAudioBlock at the right timing.