colorchord/embeddedcommon/embeddednf.h

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//Copyright 2015 <>< Charles Lohr under the ColorChord License.
#ifndef _EMBEDDEDNF_H
#define _EMBEDDEDNF_H
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#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
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//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
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#define FILTER_BLUR_PASSES 2
#endif
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//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
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#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
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#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
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//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.
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void UpdateFreqs(); //Not user-useful on most systems.
void HandleFrameInfo(); //Not user-useful on most systems
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//Call this when starting.
void InitColorChord();
#endif