文件列表:

fftw/
Makefile
fftw_main.odin
fftw_test.c

# FFTW lib bindings for Odin These are bindings for the FFTW - Fast Fourier Transform in the West, for the Odin programming language. ## Description These are bindings to the FFTW library - The Fastest Fourier Transform in the West, so you can do the FFT and Inverse FFT on f32 buffers. FFTW also allows for calculation of FFT's on f64, but I didn't mapped it, it has to be linked with a different version of the library, that also comes with the Linux version that one installs with the package manager of your distribution. The FFTW library is a C library, so this binding is a C binding. The FFTW library is a very fast FFT, also popular library and it is very easy to use. These bindings also use GCC to compile the .o obj file. ## Installation To install the FFTW on your Linux use the FFTW package from your distribution. ## Example of usage See the file fftw_main.odin for a full example of usage. ``` odin import f "./fftw" main :: proc () { // Allocates the memory for the in and out arrays for the fftw plan. buf_in : [^]f.fftwf_complex buf_out : [^]f.fftwf_complex n_samples : int = 10 sample_rate : int = 10 // Samples per second. buf_in = f.od_fftwf_malloc( n_samples ) buf_out = f.od_fftwf_malloc( n_samples ) // Creates the fftw plan for "in" and "out" buffer. plan : f.fftwf_plan plan = f.od_fftwf_plan_dft_1d( n_samples, buf_in, buf_out, int( f.Sign.FFTW_Forward ), uint( f.Flags.FFTW_Estimate ) ) // 1 FFT // Fill in_a[] with data with size n_samples, at sample_rate, at sin_freq // with a sin ( 2 * pi * f * t ) where t = i / sample_rate sin_freq : f32 = 2 // Hz fill_array_with_sin( buf_in, n_samples, sample_rate, sin_freq ) // Print in[]. print_complex_array( "in A", buf_in, n_samples, false ) // Execute the fftw plan. f.od_fftwf_execute( plan ) // Print out[]. print_complex_array( "out A", buf_out, n_samples, true ) f.correct_complex_array_scale( buf_out, n_samples ) // Print out[]. print_complex_array( "out A scale factor corrected", buf_out, n_samples, true ) // Destroy the fftw plan. f.od_fftwf_destroy_plan( plan ) // Frees the memory for the "in" and "out" arrays for the fftw plan. f.od_fftwf_free( buf_out ) f.od_fftwf_free( buf_in ) } ``` ## License My code is MIT Open Source license, but the FFTW library has it's own license. So usage of this library, must be in accordance with the FFTW license. ## Have fun Best regards,
Joo Carvalho

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