SampleRateConvertion error in plugin

Kshitij Singh answered . 2025-07-09 19:14:37

There are some limitations with codegen and the resampling objects. If you have a hard-coded ratio of 4, the easiest way around it might be to use a nominal sample rate, such as 48kHz. The added benefit is that avoid calls to getSampleRate will be faster.

function calculateSampleRates(plugin)
    sampleRate = 48000; % use a nominal rate
    plugin.Up4.InputSampleRate=sampleRate;
    plugin.Up4.OutputSampleRate=4*sampleRate;
    plugin.Down4.InputSampleRate=4*sampleRate;
    plugin.Down4.OutputSampleRate=sampleRate;
end

The following challenge will be that the input of the sample rate converter will be of unknown size. You can get around that by looping over partitions of a maximum size (like 4096). Something like this might work for you:

 

% Replaces out = step(plugin.Down4,outdisto);
out = zeros(size(in));
for ii = 1:4096:size(in,1)
    endIdx = min(ii+4095,size(in,1));
    xin = outdisto(4*ii-3:4*endIdx,:);
    assert(size(xin,1)<=4*4096); % Tell codegen xin won't be larger than 4x4096
    out(ii:endIdx,:) = step(plugin.Down4,xin);
end

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