Re: [Discuss-gnuradio] FFTW3 runtime error

[Activecat]

Dear Marcus,

Thank you very much.

As according to your guideline, the runtime error has been solved.

With some minor modification to the work() function, now the flow graph executes without any error.

Cheers,

Activecat

On Tue, Mar 4, 2014 at 6:02 PM, Marcus Müller <address@hidden> wrote:

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Sorry, forgot to mention: additionally to the solution in my answer to
Sabathy,
add ${FFTW3(F)_LIBRARIES} to your lib/CMakeLists.txt
target_link_libraries, also add: link_directories(${FFTW3F_LIBRARY_DIRS})

Greetings,
Marcus

On 04.03.2014 10:59, Marcus Müller wrote:
> Hi Activecat,
>
> your sourcecode should be fine - what you see is an error that
> tells you that at runtime, a symbol could not be found. This means
> that the fftw library has not been linked against. On 2014-02-26
> there was a thread on discuss-gnuradio with the subject "Link FFTW3
> in OOT module" featuring Sabathy Mischa and me, could you please
> look into the mailing list archive; the solution to your problem
> should be there :)
>
> Happy hacking, Marcus
>
> On 04.03.2014 07:27, Activecat wrote:
>> The implementation header file is as below:
>
>
>> #ifndef INCLUDED_ACTIVECAT_FFT1_IMPL_H #define
>> INCLUDED_ACTIVECAT_FFT1_IMPL_H
>
>> #include <activecat/fft1.h> #include <fftw3.h>
>
>> namespace gr { namespace activecat {
>
>> class fft1_impl : public fft1 { private: int d_N; int
>> d_direction; int d_shift;
>
>> fftw_complex *d_input; fftw_plan     d_plan;
>
>> public: fft1_impl(int fft_size, int direction, bool fft_shift);
>> ~fft1_impl();
>
>> int work( int noutput_items, gr_vector_const_void_star
>> &input_items, gr_vector_void_star &output_items); };
>
>> } // namespace activecat } // namespace gr
>
>> #endif /* INCLUDED_ACTIVECAT_FFT1_IMPL_H */
>
>
>
>> On Tue, Mar 4, 2014 at 1:55 PM, Activecat <address@hidden>
>> wrote:
>
>>> Dear Sir,
>>>
>>> I am trying to build a custom block with FFT capability. I use
>>> FFTW3, the FFT stuff runs well as a standalone program before
>>> integrating into gnuradio.
>>>
>>> Then I integrate the FFT function into the block, it compiles
>>> without any error. But when I run the flow graph in GRC, it
>>> produces following error message.
>>>
>>> Generating: "/home/sgku/gnuradio/flow_graphs/top_block.py"
>>> Executing: "/home/sgku/gnuradio/flow_graphs/top_block.py"
>>> Traceback (most recent call last): File
>>> "/home/sgku/gnuradio/flow_graphs/top_block.py", line 18, in
>>> <module> import activecat File
>>> "/usr/local/lib/python2.7/dist-packages/activecat/__init__.py",
>>>
>>>
line 45, in <module> from activecat_swig import * File
>>> "/usr/local/lib/python2.7/dist-packages/activecat/activecat_swig.py",
>>>
>>>
line 26, in <module> _activecat_swig = swig_import_helper() File
>>> "/usr/local/lib/python2.7/dist-packages/activecat/activecat_swig.py",
>>>
>>>
line 22, in swig_import_helper _mod =
>>> imp.load_module('_activecat_swig', fp, pathname, description)
>>> ImportError: /usr/local/lib/libgnuradio-activecat.so: undefined
>>>  symbol: fftw_plan_dft_1d
>>>>>> Done
>>>
>>>
>>> Below is the implmentation source file:
>>>
>>>
>>> namespace gr { namespace activecat {
>>>
>>> fft1::sptr fft1::make(int fft_size, int direction, bool
>>> fft_shift) { return gnuradio::get_initial_sptr (new
>>> fft1_impl(fft_size, direction, fft_shift)); }
>>>
>>> // constructor fft1_impl::fft1_impl(int fft_size, int
>>> direction, bool fft_shift) : gr::sync_block("fft1",
>>> gr::io_signature::make( 1, 1, sizeof(gr_complex)),
>>> gr::io_signature::make( 1, 1, sizeof(gr_complex))),
>>> d_N(fft_size), d_direction(direction), d_shift(fft_shift) {
>>> d_input = (fftw_complex*) fftw_malloc( sizeof(fftw_complex) *
>>> d_N ); d_plan  = fftw_plan_dft_1d( d_N, d_input, d_input,
>>> FFTW_BACKWARD, FFTW_ESTIMATE );  // later change FFTW_BACKWARD
>>> to d_direction
>>>
>>> set_output_multiple( d_N ); set_min_noutput_items( d_N ); }
>>>
>>> // destructor fft1_impl::~fft1_impl() { }
>>>
>>> int fft1_impl::work( int noutput_items,
>>> gr_vector_const_void_star &input_items, gr_vector_void_star
>>> &output_items) { const gr_complex  *in  =  (const gr_complex *)
>>> input_items[0]; gr_complex        *out =  (gr_complex *)
>>> output_items[0];
>>>
>>> for (int i=0; i < noutput_items; i++) { d_input[i][0] =
>>> in[i].real(); d_input[i][1] = in[i].imag(); }
>>>
>>> fftw_execute( d_plan );
>>>
>>> for (int i=0; i < noutput_items; i++) { out[i].real(
>>> d_input[i][0] ); out[i].imag( d_input[i][1] ); }
>>>
>>>
>>> return noutput_items; } } /* namespace activecat */ } /*
>>> namespace gr */
>>>
>>>
>>>
>>> Question: How to solve this error ?
>>>
>>> Regards, Activecat address@hidden
>>>
>
>
>
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