khalilabby asked . 2020-11-30

SampleRateConvertion error in plugin

I´m trying to implement a x4 oversampling process but I´m having difficulties on how let the SampleRateConverter sytem object knows about sample rate used.

When compiling the example attached for plugin generation, the following error shows up: “Failed to compute constant value for nontunable property 'SampleRate'. In code generation, nontunable properties can only be assigned constant values.”

I'd really appreciate if someone can give me a hint on how fix/treat this.

classdef (StrictDefaults)DistoLab_Test2 < matlab.System & audioPlugin

    
    properties        
        GainDisto=0;
        Input=0;
        Volume=0;    
    end
    
    properties (Constant, Hidden)
        % Define the plugin interface
        PluginInterface = audioPluginInterface( ...
            'InputChannels',2,...
            'OutputChannels',2,...
            'PluginName','DistoLab_Test2',...
             audioPluginParameter('Volume', ...
            'DisplayName',  'Out', ... 
            'DisplayNameLocation','none',...
            'Label','dB', ...
            'Mapping', { 'lin', -15, 15}, ...
            'Style', 'rotaryknob', 'Layout', [4 6]),...
            audioPluginParameter('Input', ...
            'DisplayName',  'In', ... 
            'DisplayNameLocation','none',...
            'Label','dB', ...
            'Mapping', { 'lin', -5, 5}, ...
            'Style', 'rotaryknob', 'Layout', [4 3]),...           
            audioPluginParameter('GainDisto', ...
            'DisplayName',  'Saturation', ... 
            'DisplayNameLocation','none',...
            'Style', 'rotaryknob', 'Layout', [4,5],...
            'Mapping', { 'lin', 0, 10}, ...
            'Filmstrip','knob_67_black.png', ...                                   %<--
            'FilmstripFrameSize',[80,80]), ...
            audioPluginGridLayout('RowHeight', [30 90 10 100 37], ... 
            'ColumnWidth', [30 100 100 20 100 100 20 80 80 80 60], 'Padding', [10 10 10 10]));
   
    end    
    
    properties (Access = private)    

        Up4;
        Down4;

    end
    
    methods
        % Constructor
        function plugin = DistoLab_Test2
  
            plugin.Up4=dsp.SampleRateConverter;
            plugin.Down4=dsp.SampleRateConverter;

            calculateSampleRates(plugin);
            
        end
        
    end

    methods(Access = protected)

        function out = stepImpl(plugin, in)

            inadjusted=in*(10^(plugin.Input/20)); % Incoming signal adjusted by Input Gain

%SampleRateConverter x4 process
    
    v=step(plugin.Up4,inadjusted);

    disto=(v*plugin.GainDisto).^5; % input distorted
        
    outdisto=(disto)*(10^(plugin.Volume/20));
    
    out = step(plugin.Down4,outdisto);  
    
         end
     
        function resetImpl(plugin)

            reset(plugin.Up4);
            reset(plugin.Down4);

        end
        function calculateSampleRates(plugin)
            
           plugin.Up4.InputSampleRate=getSampleRate(plugin);
           plugin.Up4.OutputSampleRate=4*getSamplerate(plugin);
           
           plugin.Down4.InputSampleRate=4*getSampleRate(plugin);
           plugin.Down4.OutputSampleRate=getSampleRate(plugin);

        end
  
    end
    
end

matlab , signal , transform, signal processing

Expert Answer

Kshitij Singh answered . 2024-12-21 00:48:52

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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