How to make a synth voice play back a wav file on a sample-by-sample basis?

1

I want to try to trigger a WAV file to play back in sample-by-sample processing within my MPESynthVoice under renderNextBlock. I am okay with the file location being hardcoded for simple testing.

eg. file is C:\testwav.wav

I would like a simple way of having it do something like this:

//To trigger playback:
playWav = true;
sampleIndex = 0;

//Playback:
if (playWav == true) {
double wavSampleOutput = wavSample[sampleIndex];
sampleIndex = sampleIndex +1;
}

I don’t want to manually put it all the wav file’s values into an array/vector or anything though. I just mean I want to step through the wav file sample-by-sample on command/trigger and get the values so I can use them elsewhere in my synth voice.

The tutorial I see on playing back audio samples is all about block/buffer based processing:

https://docs.juce.com/master/tutorial_playing_sound_files.html

Is there any simple way to do what I’m talking about? Could you share a bit of example code for how it would work? Thanks.

2

If the only way to do this is to iterate through the samples of the wav file and add them to a vector to create a wave table on initialization of the voice/synth, I’m okay with that too. I just don’t want to have to manually create the vector of all the per sample wav values myself. Is it possible to make JUCE do that?

3

You need to load the whole WAV file into memory. You can stream, but takes a bit more work. If I recall JUCE does have a code for that, but I don’t remember what it was.