Using GCCPhat with Matlab Coder Issues - 'xref' not fully defined

Hello,

I am attempting to use the gccphat method with the matlab coder (well actually part of the audioPlugin framework, but that shouldn't make any difference) When the gccphat attempts to run, I get an error that

Line 82 Variable 'xref' is not fully defined on some execution paths.

The documentation for gccphat suggests it is suitable for use with code generation, though does not support variable-size inputs. I don't think I am applying variable size inputs, but would like some clarification as to this point - Does it mean that the number of inputs cannot change? or the length of inputs can't change? Or neither can change. Though, every time the method is called, the full method is run, so what changes would not be acceptable.

Answer 1

[Honglei Chen]

Sorry for the late reply. This is a bug. I think the easiest way to fix this is to supply the sampling frequency as the third input, i.e., using the syntax

gccphpat(in(:,1),in(:,2),fs)

If you don't have the sampling frequency, you can just set fs to 1, like

gccphat(in(:,1),in(:,2),1)

since that's the default value used in the function.

HTH and thanks for reporting this.

Answer 2

[Honglei Chen]

Could you share your script? In terms of limitation, neither number of inputs nor sizes of inputs can change but your issue doesn't seem to be related to that. Thanks.

[Dave Moffat]

Hello,

Thank you for the speedy response.

Here is my MWE

classdef testPlugin < audioPlugin
    methods
        function out = process(p, in)
            [tdoa,corrVal,lag] = gccphat(in(:,1),in(:,2));
            out = in;
        end
    end
end
this gives the error when running

validateAudioPlugin testPlugin

with the following error report

checking plug-in class 'testPlugin'... passed.
Generating testbench file 'testbench_testPlugin.m'... done.
Running testbench... passed.
Generating mex file 'testbench_testPlugin_mex.mexmaci64'... ??? Variable 'xref' is not fully defined on some execution paths.
Error in ==> gccphat Line: 82 Column: 28
Code generation failed: View Error Report
Error using coder.internal.generateAudioPlugin

Many thanks

Answer 3

[Dave Moffat]

Hello,

Thank you for the speedy response.

Here is my MWE

classdef testPlugin < audioPlugin
    methods
        function out = process(p, in)
            [tdoa,corrVal,lag] = gccphat(in(:,1),in(:,2));
            out = in;
        end
    end
end

this gives the error when running

validateAudioPlugin testPlugin

with the following error report

checking plug-in class 'testPlugin'... passed.
Generating testbench file 'testbench_testPlugin.m'... done.
Running testbench... passed.
Generating mex file 'testbench_testPlugin_mex.mexmaci64'... ??? Variable 'xref' is not fully defined on some execution paths.
Error in ==> gccphat Line: 82 Column: 28
Code generation failed: View Error Report
Error using coder.internal.generateAudioPlugin

Many thanks