Creating a WAV file from other WAV files, addFrom(...)

General JUCE discussion
1

Hello, I am trying to create a WAV file from another WAV file. I have written 3 functions: _readWavFileIntoAudioSampleBuffer reads a WAV file into an audio sample buffer, _writeToWavFile writes WAV samples to a file, and _writeToOutputBuffer copies WAV audio samples from one audio buffer to another.

If I read a WAV file into a buffer and then write it to another file, the resulting file is the same as the original, so the problem may not be with how I read and write WAV data.

The other function, the one that copies WAV samples between buffers contains this:

outputAudioBuffer.addFrom(
	0, 
	0, 
	sourceAudioBuffer,
	0,
	0,
	sourceAudioBuffer.getNumSamples(),
	1.00
);

The output buffer is 4 seconds long and is created like this:

    //
double dblSamplingRate = 48000;
double dblDurationTicks = 4000; // 4 seconds
int iSampleLength = (int)(dblSamplingRate * dblDurationTicks / 1000.0);
juce::AudioSampleBuffer outputAudioBuffer(1, iSampleLength);

After reading a WAV file, copying the samples to the output audio buffer, and saving to disk, the resulting WAV file is silent. No sound from the source file is present.