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
>
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