17 lines
902 B
C
17 lines
902 B
C
|
#ifndef _DFT_H
|
||
|
|
#define _DFT_H
|
||
|
|
|
||
|
|
//XXX WARNING: TODO: the last two parameters are a double due to a compiler bug.
|
||
|
|
|
||
|
|
//Do a DFT on a live audio ring buffer. It assumes new samples are added on in the + direction, older samples go negative.
|
||
|
|
//Frequencies are as a function of the samplerate, for example, a frequency of 22050 is actually 2 Hz @ 44100 SPS
|
||
|
|
//bins = number of frequencies to check against.
|
||
|
|
void DoDFT( float * outbins, float * frequencies, int bins, float * databuffer, int place_in_data_buffer, int size_of_data_buffer, float q );
|
||
|
|
|
||
|
|
//Skip many of the samples on lower frequencies; TODO: Need to fix the nyquist problem where high frequencies show low-frequency components.
|
||
|
|
//Speedup = target number of data points
|
||
|
|
void DoDFTQuick( float * outbins, float * frequencies, int bins, const float * databuffer, int place_in_data_buffer, int size_of_data_buffer, float q, float speedup );
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|