colorchord/embeddedcommon/embeddednf.h

//Copyright 2015 <>< Charles Lohr under the ColorChord License.

#ifndef _EMBEDDEDNF_H
#define _EMBEDDEDNF_H

#include <ccconfig.h>

//Use a 32-bit DFT.  It won't work for AVRs, but for any 32-bit systems where
//they can multiply quickly, this is the bees knees.
#define USE_32DFT

#ifndef DFREQ
#define DFREQ     8000
#endif

//You may make this a float. If PRECOMPUTE_FREQUENCY_TABLE is defined, then
//it will create the table at compile time, and the float will never be used
//runtime.
#define BASE_FREQ 55.0

//The higher the number the slackier your FFT will be come.
#ifndef FUZZ_IIR_BITS
#define FUZZ_IIR_BITS  1
#endif

//Notes are the individually identifiable notes we receive from the sound.
//We track up to this many at one time.  Just because a note may appear to
//vaporize in one frame doesn't mean it is annihilated immediately.
#ifndef MAXNOTES
#define MAXNOTES  12
#endif

//We take the raw signal off of the 
#ifndef FILTER_BLUR_PASSES
#define FILTER_BLUR_PASSES 1
#endif

//Determines bit shifts for where notes lie.  We represent notes with an
//uint8_t.  We have to define all of the possible locations on the note line
//in this. note_frequency = 0..((1<<SEMIBITSPERBIN)*FIXBPERO-1)
#ifndef SEMIBITSPERBIN
#define SEMIBITSPERBIN 3 
#endif

#define NOTERANGE ((1<<SEMIBITSPERBIN)*FIXBPERO)


//If there is detected note this far away from an established note, we will
//then consider this new note the same one as last time, and move the
//established note.  This is also used when combining notes.  It is this
//distance times two.
#ifndef MAX_JUMP_DISTANCE
#define MAX_JUMP_DISTANCE 4
#endif

#ifndef MAX_COMBINE_DISTANCE
#define MAX_COMBINE_DISTANCE 7
#endif

//These control how quickly the IIR for the note strengths respond.  AMP 1 is
//the response for the slow-response, or what we use to determine size of
//splotches, AMP 2 is the quick response, or what we use to see the visual
//strength of the notes.
#ifndef AMP_1_IIR_BITS
#define AMP_1_IIR_BITS 4
#endif

#ifndef AMP_2_IIR_BITS
#define AMP_2_IIR_BITS 2
#endif

//This is the amplitude, coming from folded_bins.  If the value is below this
//it is considered a non-note.
#ifndef MIN_AMP_FOR_NOTE
#define MIN_AMP_FOR_NOTE 80
#endif

//If the strength of a note falls below this, the note will disappear, and be
//recycled back into the unused list of notes.
#ifndef MINIMUM_AMP_FOR_NOTE_TO_DISAPPEAR
#define MINIMUM_AMP_FOR_NOTE_TO_DISAPPEAR 64
#endif

//This prevents compilation of any floating-point code, but it does come with
//an added restriction: Both DFREQ and BASE_FREQ must be #defined to be
//constants.
#define PRECOMPUTE_FREQUENCY_TABLE

#include "DFT32.h"

extern uint16_t fuzzed_bins[]; //[FIXBINS]  <- The Full DFT after IIR, Blur and Taper

extern uint16_t folded_bins[]; //[FIXBPERO] <- The folded fourier output.

//frequency of note; Note if it is == 255, then it means it is not set. It is
//generally a value from 
extern uint8_t  note_peak_freqs[]; //[MAXNOTES]
extern uint16_t note_peak_amps[];  //[MAXNOTES] 
extern uint16_t note_peak_amps2[]; //[MAXNOTES]  (Responds quicker)
extern uint8_t  note_jumped_to[];  //[MAXNOTES] When a note combines into another one,
	//this records where it went.  I.e. if your note just disappeared, check this flag.

void UpdateFreqs();		//Not user-useful on most systems.
void HandleFrameInfo();	//Not user-useful on most systems



//Call this when starting.
void InitColorChord();


#endif