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[Discuss-gnuradio] Gr-Specest: window not passed?


From: Ludwig Stephan (CR/AEH4)
Subject: [Discuss-gnuradio] Gr-Specest: window not passed?
Date: Mon, 12 Jan 2015 14:17:11 +0000

Hello Moritz,
Hello List,

I might have found some unintended behaviour in gr-specest. I claim that the 
content of const std::vector<float> &window is not passed in the constructor, 
if called by the GRC block. I cannot explain why and ask for hints on how to 
correct the behavior. I could supply a patch then.

Consider the enclosed diff against the git version of lib/Welch_impl.cc, which 
basically adds some debugging output. Running this with the original GRC block, 
I get the following output:

Window created; size: 2048 (which is my FFT size) => the make(..int 
window_type..) function works correctly
specest_check_arguments_impl::window.size() = 0 => this make(..., const 
std::vector<float> &window) does not get the window's values
Constructor: 0 => the constructor(..., const std::vector<float> &window) does 
not get the window's values, either

I suppose that this has something to do with the call-by-reference  of const 
std::vector, but I cannot explain why.

Can you confirm this behavior? Could you please help me finding a solution for 
this an let me fix it?

Best regards

 Stephan Ludwig

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Attachment: welch_impl.cc.diff
Description: welch_impl.cc.diff


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