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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 <active...@gmail.com>
> 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 active...@gmail.com
>>
>
>
>
> _______________________________________________ Discuss-gnuradio
> mailing list Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
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