70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
#ifndef _DFT32_H
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#define _DFT32_H
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#include <stdint.h>
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//A 32-bit version of the DFT used for ColorChord.
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//This header makes it convenient to use for an embedded system.
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//The 32-bit DFT avoids some bit shifts, however it uses slightly
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//more RAM and it uses a lot of 32-bit arithmatic.
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//
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//This is basically a clone of "ProgressiveIntegerSkippy" and changes
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//made here should be backported there as well.
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//You can # define these to be other things elsewhere.
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#ifndef OCTAVES
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#define OCTAVES 5
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#endif
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#ifndef FIXBPERO
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#define FIXBPERO 24
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#endif
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#ifndef FIXBINS
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#define FIXBINS (FIXBPERO*OCTAVES)
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#endif
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#ifndef BINCYCLE
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#define BINCYCLE (1<<OCTAVES)
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#endif
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//You may increase this past 5 but if you do, the amplitude of your incoming signal
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//must decrease. Increasing this value makes responses slower. Lower values are
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//more responsive.
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#ifndef DFTIIR
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#define DFTIIR 4
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#endif
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//Everything the integer one buys, except it only calculates 2 octaves worth of notes per audio frame.
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//This is sort of working, but still have some quality issues.
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//It would theoretically be fast enough to work on an AVR.
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//NOTE: This is the only DFT available to the embedded port of ColorChord
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#ifndef CCEMBEDDED
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void DoDFTProgressive32( float * outbins, float * frequencies, int bins, const float * databuffer, int place_in_data_buffer, int size_of_data_buffer, float q, float speedup );
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#endif
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//It's actually split into a few functions, which you can call on your own:
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int SetupDFTProgressive32(); //Call at start. Returns nonzero if error.
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void UpdateBins32( const uint16_t * frequencies );
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//Call this to push on new frames of sound.
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//Though it accepts an int16, it actually only takes -4095 to +4095. (13-bit)
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//Any more and you will exceed the accumulators and it will cause an overflow.
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void PushSample32( int16_t dat );
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#ifndef CCEMBEDDED
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void UpdateBinsForDFT32( const float * frequencies ); //Update the frequencies
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#endif
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void UpdateOutputBins32();
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//Whenever you need to read the bins, you can do it from here.
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//These outputs are limited to 0..~2047, this makes it possible
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//for you to process with uint16_t's more easily.
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//This is updated every time the DFT hits the octavecount, or 1/32 updates.
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extern uint16_t embeddedbins32[]; //[FIXBINS]
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#endif
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