c++ 利用fftw做傅里叶变换报错 linux系统下运行

Question

报错信息 fftw: alloc.c:269: assertion failed: p

#include <fftw3.h>

namespace gr {
  namespace howto {


    peak_extract::sptr
    peak_extract::make(int upper_limit,int lower_limit,int samp_rate,bool boolean_timer)
    {
      return gnuradio::get_initial_sptr
        (new peak_extract_impl(upper_limit,lower_limit,samp_rate,boolean_timer));
    }

    /*
     * The private constructor
     */
    peak_extract_impl::peak_extract_impl(int upper_limit,int lower_limit,int samp_rate,bool boolean_timer)
      : gr::block("peak_extract",
              gr::io_signature::make(1, 1, sizeof(gr_complex)),
              gr::io_signature::make(1, 1, sizeof(int))),
          d_upper_limit(upper_limit),
          d_lower_limit(lower_limit),
              d_samp_rate(samp_rate),
          d_boolean_timer(boolean_timer),
          d_packet_len(packet_len),
          d_buffer((fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex)*d_packet_len)),           
          d_fft_plan(fftwf_plan_dft_1d(d_packet_len, d_buffer, d_buffer, FFTW_FORWARD, FFTW_ESTIMATE))

    {}

    /*
     * Our virtual destructor.
     */
    peak_extract_impl::~peak_extract_impl()
    {
    fftwf_destroy_plan(d_fft_plan);
    fftwf_free(d_buffer);
    }

    void
    peak_extract_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
    {
        /* <+forecast+> e.g. ninput_items_required[0] = noutput_items */
        ninput_items_required[0] = noutput_items;
    }

    int
    peak_extract_impl::general_work (int noutput_items,
                       gr_vector_int &ninput_items,
                       gr_vector_const_void_star &input_items,
                       gr_vector_void_star &output_items)
    {
        const gr_complex *in = (const gr_complex *) input_items[0];
        int *out = (int *) output_items[0];

    memcpy(d_buffer,in,d_packet_len*sizeof(fftwf_complex));
    fftwf_execute(d_fft_plan);
    int i,index,N;
        N=d_packet_len;
    //M=sizeof(in) / sizeof(in[0]);
    double max,magnitude[N];
    double real[N],imag[N];


    for(i=0;i<d_packet_len;i++)
    {
        real[i]=d_buffer[i][0];
        imag[i]=d_buffer[i][1];
        magnitude[i]=sqrt((real[i]*real[i])+(imag[i]*imag[i]));
    }


        max=magnitude[0];
        for (i=0;i<d_packet_len;i++)
        {
            if(magnitude[i]>max)
                {
                   max=magnitude[i];
                   index=i;
                }
        }

         *out=index*d_samp_rate/d_packet_len;

        // Do <+signal processing+>
        // Tell runtime system how many input items we consumed on
        // each input stream.
      //  consume_each (noutput_items);

        // Tell runtime system how many output items we produced.
        return noutput_items;
    }

  } /* namespace howto */
} /* namespace gr */

Answer 1

分配空间的问题。。。发现只要去掉FFTblock就可以了