Resampling every buffer

General JUCE discussion
1

I am working on a project that requires resampling every buffer from a source that can change sample rates (hint: network audio).

I’m doing the following for the conversion and it does not sound good.

AudioFrame audioFrame; //I didn't write this type.

//the buffer from the network has some unknown samplerate.
auto buffer = getBufferFromNetwork(&audioFrame);

if( sampleRate.load() != audioFrame.sample_rate )
{
    /*
           resample from the sample rate of the network sender to the sample rate of the host.
     */
    DBG( "resampling buffer from " << audioFrame.sample_rate << "hz to " << sampleRate.load() << "hz");
    juce::MemoryAudioSource memoryAudioSource(buffer, true);
    auto preferredRatio = static_cast<double>(audioFrame.sample_rate) / static_cast<double>(sampleRate.load());
            
    juce::ResamplingAudioSource resampler(&memoryAudioSource, false, audioFrame.no_channels);
            
    resampler.prepareToPlay(maxSamplesPerBlock.load(),
                             static_cast<double>(sampleRate.load()));
    resampler.setResamplingRatio(preferredRatio);
            
    juce::AudioBuffer<float> tempBuffer(audioFrame.no_channels, audioFrame.no_samples);
    juce::AudioSourceChannelInfo asci(&tempBuffer, 0, audioFrame.no_samples);
            
    resampler.getNextAudioBlock(asci);
            
    buffer = tempBuffer;
}

//now do whatever I need to do with buffer, since it now 
//contains audio at the host's samplerate

Any idea what is the problem or where to start looking?

2

One problem might be that the resampler is most likely stateful (haven’t checked the ResamplingAudioSource, bit most interpolators are)