/*
	SuperCollider real time audio synthesis system
 Copyright (c) 2002 James McCartney. All rights reserved.
	http://www.audiosynth.com

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */

//Nick Collins 20 Feb 2006
//revision of algorithm 22 Nov 2007
//converted to give output as key clarity (highest correlation) 25 Sep 2013. Note that have switched to using Krumhansl Kessler profiles here

//Key tracker using weights of FFT bins.

#include "SC_PlugIn.h"
#include "FFT_UGens.h"

InterfaceTable *ft; 

//hard coded FFT size
#define N 4096
#define NOVER2 2048

//CONVERT TO m_frameperiod to cope with different sampling rates?
#define FRAMEPERIOD 0.046439909297052

//weighting parameters



struct KeyClarity : Unit {
    
	//FFT data
	float * m_FFTBuf;
    
	//coping with different sampling rates
	float m_srate;		//use as a flag to check sample rate is correct
	float * m_weights;  //will point to the sample rate specific data
	int * m_bins;
	float m_frameperiod;
    
	//counter
	//uint32 m_frame;
    
	//experimental transient avoidance
	//float m_prevphase[720]; //60*12
	//float m_leaknote[60];
    
	float m_chroma[12];
	float m_key[24];
    
	float m_histogram[24];   //key histogram
    //float m_keyleak; //fade parameter for histogram
	//int m_triggerid;
    
	int m_currentKey;
    float m_currentMaxCorrelation; 
};



extern "C"
{
    
	void KeyClarity_next(KeyClarity *unit, int wrongNumSamples);
	void KeyClarity_Ctor(KeyClarity *unit);
	void KeyClarity_Dtor(KeyClarity *unit);

}


//4096 FFT at 44100 SR
static float g_weights44100[720]= { 0.89160997732426, 0.10839002267574, 0.39160997732426, 0.10839002267574, 0.2249433106576, 0.10839002267574, 0.14160997732426, 0.10839002267574, 0.091609977324263, 0.10839002267574, 0.05827664399093, 0.10839002267574, 0.58784929938181, 0.41215070061819, 0.087849299381813, 0.41215070061819, 0.25451596604848, 0.078817367284855, 0.087849299381813, 0.16215070061819, 0.18784929938181, 0.012150700618187, 0.087849299381812, 0.078817367284855, 0.26602607158423, 0.73397392841577, 0.26602607158423, 0.23397392841577, 0.26602607158423, 0.067307261749107, 0.016026071584227, 0.23397392841577, 0.066026071584226, 0.13397392841577, 0.099359404917559, 0.067307261749107, 0.9250662388251, 0.074933761174898, 0.4250662388251, 0.074933761174898, 0.25839957215844, 0.074933761174898, 0.1750662388251, 0.074933761174898, 0.1250662388251, 0.074933761174898, 0.091732905491768, 0.074933761174898, 0.56383187935789, 0.43616812064211, 0.063831879357891, 0.43616812064211, 0.23049854602456, 0.10283478730877, 0.063831879357891, 0.18616812064211, 0.16383187935789, 0.03616812064211, 0.063831879357892, 0.10283478730877, 0.18111740708786, 0.81888259291214, 0.18111740708786, 0.31888259291214, 0.18111740708786, 0.15221592624547, 0.18111740708786, 0.068882592912141, 0.18111740708786, 0.018882592912141, 0.014450740421193, 0.15221592624547, 0.77564554804057, 0.22435445195943, 0.27564554804057, 0.22435445195943, 0.1089788813739, 0.22435445195943, 0.02564554804057, 0.22435445195943, 0.17564554804057, 0.024354451959429, 0.1089788813739, 0.057687785292764, 0.34606307757871, 0.65393692242129, 0.34606307757871, 0.15393692242129, 0.012729744245378, 0.32060358908796, 0.096063077578711, 0.15393692242129, 0.14606307757871, 0.053936922421289, 0.012729744245378, 0.15393692242129, 0.89093630414068, 0.10906369585932, 0.39093630414068, 0.10906369585932, 0.22426963747401, 0.10906369585932, 0.14093630414068, 0.10906369585932, 0.090936304140679, 0.10906369585932, 0.057602970807346, 0.10906369585932, 0.40874628442826, 0.59125371557174, 0.40874628442826, 0.091253715571737, 0.075412951094929, 0.2579203822384, 0.15874628442826, 0.091253715571737, 0.0087462844282626, 0.19125371557174, 0.075412951094929, 0.091253715571738, 0.89788375407457, 0.10211624592543, 0.39788375407457, 0.10211624592543, 0.23121708740791, 0.10211624592543, 0.14788375407457, 0.10211624592543, 0.097883754074573, 0.10211624592543, 0.06455042074124, 0.10211624592543, 0.35664375687383, 0.64335624312617, 0.35664375687383, 0.14335624312617, 0.023310423540502, 0.31002290979283, 0.10664375687383, 0.14335624312617, 0.15664375687384, 0.043356243126163, 0.023310423540502, 0.14335624312616, 0.78321995464853, 0.21678004535147, 0.28321995464853, 0.21678004535147, 0.11655328798186, 0.21678004535147, 0.033219954648526, 0.21678004535147, 0.18321995464853, 0.016780045351474, 0.11655328798186, 0.050113378684807, 0.17569859876363, 0.82430140123637, 0.17569859876363, 0.32430140123637, 0.17569859876362, 0.15763473456971, 0.17569859876363, 0.074301401236374, 0.17569859876363, 0.024301401236373, 0.0090319320969575, 0.15763473456971, 0.53205214316846, 0.46794785683154, 0.032052143168455, 0.46794785683154, 0.19871880983512, 0.13461452349821, 0.032052143168455, 0.21794785683154, 0.13205214316846, 0.067947856831543, 0.032052143168454, 0.13461452349821, 0.8501324776502, 0.1498675223498, 0.3501324776502, 0.1498675223498, 0.18346581098354, 0.1498675223498, 0.1001324776502, 0.1498675223498, 0.050132477650203, 0.1498675223498, 0.01679914431687, 0.1498675223498, 0.12766375871578, 0.87233624128422, 0.12766375871578, 0.37233624128422, 0.12766375871578, 0.20566957461755, 0.12766375871578, 0.12233624128422, 0.12766375871578, 0.072336241284219, 0.12766375871578, 0.039002907950883, 0.36223481417572, 0.63776518582428, 0.36223481417572, 0.13776518582428, 0.028901480842386, 0.30443185249095, 0.11223481417572, 0.13776518582428, 0.16223481417572, 0.037765185824279, 0.028901480842386, 0.13776518582428, 0.55129109608114, 0.44870890391886, 0.05129109608114, 0.44870890391886, 0.21795776274781, 0.11537557058553, 0.05129109608114, 0.19870890391886, 0.15129109608114, 0.048708903918859, 0.051291096081139, 0.11537557058553, 0.69212615515742, 0.30787384484258, 0.19212615515742, 0.30787384484258, 0.025459488490756, 0.30787384484258, 0.19212615515742, 0.057873844842579, 0.092126155157422, 0.10787384484258, 0.025459488490756, 0.14120717817591, 0.78187260828136, 0.21812739171864, 0.28187260828136, 0.21812739171864, 0.11520594161469, 0.21812739171864, 0.031872608281361, 0.21812739171864, 0.18187260828136, 0.018127391718639, 0.11520594161469, 0.051460725051972, 0.81749256885653, 0.18250743114347, 0.31749256885653, 0.18250743114347, 0.15082590218986, 0.18250743114348, 0.067492568856526, 0.18250743114347, 0.017492568856525, 0.18250743114347, 0.15082590218986, 0.015840764476809, 0.79576750814915, 0.20423249185085, 0.29576750814915, 0.20423249185085, 0.12910084148248, 0.20423249185085, 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0.70026495530041, 0.29973504469959, 0.20026495530041, 0.29973504469959, 0.03359828863374, 0.29973504469959, 0.20026495530041, 0.049735044699592, 0.10026495530041, 0.099735044699594, 0.03359828863374, 0.13306837803293, 0.25532751743156, 0.74467248256844, 0.25532751743156, 0.24467248256844, 0.25532751743157, 0.078005815901766, 0.0053275174315637, 0.24467248256844, 0.055327517431562, 0.14467248256844, 0.088660850764901, 0.078005815901766, 0.72446962835144, 0.27553037164856, 0.22446962835144, 0.27553037164856, 0.057802961684772, 0.27553037164856, 0.22446962835144, 0.025530371648557, 0.12446962835144, 0.075530371648557, 0.057802961684772, 0.1088637049819, 0.10258219216228, 0.89741780783772, 0.10258219216228, 0.39741780783772, 0.10258219216228, 0.23075114117105, 0.10258219216228, 0.14741780783772, 0.10258219216228, 0.097417807837718, 0.10258219216228, 0.064084474504388, 0.38425231031485, 0.61574768968515, 0.38425231031485, 0.11574768968515, 0.050918976981516, 0.28241435635182, 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0.089671231350877, 0.07699543531578, 0.25633789801755, 0.16032876864912, 0.089671231350877, 0.010328768649129, 0.18967123135087, 0.07699543531578, 0.089671231350887, 0.5370092412594, 0.4629907587406, 0.037009241259398, 0.4629907587406, 0.20367590792606, 0.12965742540727, 0.037009241259398, 0.2129907587406, 0.1370092412594, 0.062990758740602, 0.037009241259398, 0.12965742540727, 0.25498086625089, 0.74501913374911, 0.25498086625089, 0.24501913374911, 0.25498086625089, 0.078352467082444, 0.0049808662508894, 0.24501913374911, 0.054980866250889, 0.14501913374911, 0.088314199584223, 0.078352467082444, 0.53994055085221, 0.46005944914779, 0.039940550852208, 0.46005944914779, 0.20660721751887, 0.12672611581447, 0.039940550852208, 0.21005944914779, 0.1399405508522, 0.060059449147798, 0.039940550852198, 0.12672611581447, 0.36614006519321, 0.63385993480679, 0.36614006519321, 0.13385993480679, 0.032806731859864, 0.30052660147347, 0.11614006519321, 0.13385993480679, 0.16614006519319, 0.03385993480681, 0.032806731859864, 0.1338599348068, 0.70630010998138, 0.29369989001862, 0.20630010998138, 0.29369989001862, 0.039633443314737, 0.2936998900186, 0.20630010998138, 0.043699890018615, 0.10630010998138, 0.093699890018615, 0.039633443314737, 0.12703322335193 };
static int g_bins44100[720]= { 5, 6, 10, 11, 15, 16, 20, 21, 25, 26, 30, 31, 5, 6, 10, 11, 16, 17, 21, 22, 27, 28, 32, 33, 5, 6, 11, 12, 17, 18, 22, 23, 28, 29, 34, 35, 6, 7, 12, 13, 18, 19, 24, 25, 30, 31, 36, 37, 6, 7, 12, 13, 19, 20, 25, 26, 32, 33, 38, 39, 6, 7, 13, 14, 20, 21, 27, 28, 34, 35, 40, 41, 7, 8, 14, 15, 21, 22, 28, 29, 36, 37, 43, 44, 7, 8, 15, 16, 22, 23, 30, 31, 38, 39, 45, 46, 8, 9, 16, 17, 24, 25, 32, 33, 40, 41, 48, 49, 8, 9, 17, 18, 25, 26, 34, 35, 42, 43, 51, 52, 9, 10, 18, 19, 27, 28, 36, 37, 45, 46, 54, 55, 9, 10, 19, 20, 28, 29, 38, 39, 48, 49, 57, 58, 10, 11, 20, 21, 30, 31, 40, 41, 51, 52, 61, 62, 10, 11, 21, 22, 32, 33, 43, 44, 54, 55, 64, 65, 11, 12, 22, 23, 34, 35, 45, 46, 57, 58, 68, 69, 12, 13, 24, 25, 36, 37, 48, 49, 60, 61, 72, 73, 12, 13, 25, 26, 38, 39, 51, 52, 64, 65, 77, 78, 13, 14, 27, 28, 40, 41, 54, 55, 68, 69, 81, 82, 14, 15, 28, 29, 43, 44, 57, 58, 72, 73, 86, 87, 15, 16, 30, 31, 45, 46, 61, 62, 76, 77, 91, 92, 16, 17, 32, 33, 48, 49, 64, 65, 81, 82, 97, 98, 17, 18, 34, 35, 51, 52, 68, 69, 85, 86, 103, 104, 18, 19, 36, 37, 54, 55, 72, 73, 91, 92, 109, 110, 19, 20, 38, 39, 57, 58, 77, 78, 96, 97, 115, 116, 20, 21, 40, 41, 61, 62, 81, 82, 102, 103, 122, 123, 21, 22, 43, 44, 64, 65, 86, 87, 108, 109, 129, 130, 22, 23, 45, 46, 68, 69, 91, 92, 114, 115, 137, 138, 24, 25, 48, 49, 72, 73, 97, 98, 121, 122, 145, 146, 25, 26, 51, 52, 77, 78, 102, 103, 128, 129, 154, 155, 27, 28, 54, 55, 81, 82, 109, 110, 136, 137, 163, 164, 28, 29, 57, 58, 86, 87, 115, 116, 144, 145, 173, 174, 30, 31, 61, 62, 91, 92, 122, 123, 153, 154, 183, 184, 32, 33, 64, 65, 97, 98, 129, 130, 162, 163, 194, 195, 34, 35, 68, 69, 103, 104, 137, 138, 171, 172, 206, 207, 36, 37, 72, 73, 109, 110, 145, 146, 182, 183, 218, 219, 38, 39, 77, 78, 115, 116, 154, 155, 192, 193, 231, 232, 40, 41, 81, 82, 122, 123, 163, 164, 204, 205, 245, 246, 43, 44, 86, 87, 129, 130, 173, 174, 216, 217, 259, 260, 45, 46, 91, 92, 137, 138, 183, 184, 229, 230, 275, 276, 48, 49, 97, 98, 145, 146, 194, 195, 242, 243, 291, 292, 51, 52, 102, 103, 154, 155, 205, 206, 257, 258, 308, 309, 54, 55, 109, 110, 163, 164, 218, 219, 272, 273, 327, 328, 57, 58, 115, 116, 173, 174, 231, 232, 288, 289, 346, 347, 61, 62, 122, 123, 183, 184, 244, 245, 306, 307, 367, 368, 64, 65, 129, 130, 194, 195, 259, 260, 324, 325, 389, 390, 68, 69, 137, 138, 206, 207, 274, 275, 343, 344, 412, 413, 72, 73, 145, 146, 218, 219, 291, 292, 364, 365, 436, 437, 77, 78, 154, 155, 231, 232, 308, 309, 385, 386, 462, 463, 81, 82, 163, 164, 245, 246, 326, 327, 408, 409, 490, 491, 86, 87, 173, 174, 259, 260, 346, 347, 432, 433, 519, 520, 91, 92, 183, 184, 275, 276, 366, 367, 458, 459, 550, 551, 97, 98, 194, 195, 291, 292, 388, 389, 485, 486, 583, 584, 102, 103, 205, 206, 308, 309, 411, 412, 514, 515, 617, 618, 109, 110, 218, 219, 327, 328, 436, 437, 545, 546, 654, 655, 115, 116, 231, 232, 346, 347, 462, 463, 577, 578, 693, 694, 122, 123, 244, 245, 367, 368, 489, 490, 612, 613, 734, 735, 129, 130, 259, 260, 389, 390, 518, 519, 648, 649, 778, 779, 137, 138, 274, 275, 412, 413, 549, 550, 687, 688, 824, 825, 145, 146, 291, 292, 436, 437, 582, 583, 728, 729, 873, 874, 154, 155, 308, 309, 462, 463, 617, 618, 771, 772, 925, 926 };

//4096 FFT at 48000 SR
static float g_weights48000[720]= { 0.30666666666667, 0.69333333333333, 0.30666666666667, 0.19333333333333, 0.30666666666667, 0.026666666666667, 0.056666666666667, 0.19333333333333, 0.10666666666667, 0.093333333333333, 0.14, 0.026666666666667, 0.027586543807041, 0.97241345619296, 0.027586543807041, 0.47241345619296, 0.02758654380704, 0.30574678952629, 0.027586543807041, 0.22241345619296, 0.027586543807041, 0.17241345619296, 0.02758654380704, 0.13908012285963, 0.73191145326801, 0.26808854673199, 0.23191145326801, 0.26808854673199, 0.065244786601342, 0.26808854673199, 0.23191145326801, 0.018088546731992, 0.13191145326801, 0.068088546731992, 0.065244786601342, 0.10142188006533, 0.41865460692056, 0.58134539307944, 0.41865460692056, 0.081345393079437, 0.08532127358723, 0.2480120597461, 0.16865460692056, 0.081345393079437, 0.018654606920562, 0.18134539307944, 0.08532127358723, 0.081345393079437, 0.086770539160062, 0.91322946083994, 0.086770539160062, 0.41322946083994, 0.086770539160063, 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0.10428519054773, 0.14571480945227, 0.054285190547728, 0.14571480945227, 0.020951857214394, 0.14571480945227, 0.09944559244812, 0.90055440755188, 0.09944559244812, 0.40055440755188, 0.09944559244813, 0.2338877408852, 0.09944559244812, 0.15055440755188, 0.099445592448126, 0.10055440755187, 0.09944559244813, 0.067221074218537, 0.1213316130227, 0.8786683869773, 0.1213316130227, 0.3786683869773, 0.1213316130227, 0.21200172031063, 0.1213316130227, 0.1286683869773, 0.1213316130227, 0.078668386977301, 0.1213316130227, 0.045335053643962, 0.90666666666667, 0.093333333333334, 0.40666666666667, 0.093333333333334, 0.24, 0.093333333333334, 0.15666666666667, 0.093333333333334, 0.10666666666667, 0.093333333333328, 0.073333333333333, 0.093333333333334, 0.44138470091265, 0.55861529908735, 0.44138470091265, 0.05861529908735, 0.10805136757931, 0.22528196575402, 0.19138470091265, 0.05861529908735, 0.041384700912658, 0.15861529908734, 0.10805136757931, 0.058615299087355, 0.71058325228817, 0.28941674771183, 0.21058325228817, 0.28941674771183, 0.043916585621503, 0.28941674771183, 0.21058325228817, 0.039416747711826, 0.11058325228817, 0.089416747711834, 0.043916585621503, 0.12275008104516, 0.698473710729, 0.301526289271, 0.198473710729, 0.301526289271, 0.031807044062343, 0.30152628927099, 0.198473710729, 0.051526289270996, 0.09847371072899, 0.10152628927101, 0.031807044062343, 0.13485962260432, 0.38832862656099, 0.61167137343901, 0.38832862656099, 0.11167137343901, 0.054995293227667, 0.27833804010567, 0.13832862656099, 0.11167137343901, 0.188328626561, 0.011671373439003, 0.054995293227667, 0.111671373439, 0.76242588419157, 0.23757411580843, 0.26242588419157, 0.23757411580843, 0.095759217524896, 0.23757411580844, 0.012425884191572, 0.23757411580843, 0.16242588419157, 0.037574115808434, 0.095759217524896, 0.070907449141771, 0.80198955619638, 0.19801044380362, 0.30198955619638, 0.19801044380362, 0.13532288952971, 0.19801044380362, 0.051989556196375, 0.19801044380362, 0.0019895561963722, 0.19801044380363, 0.13532288952971, 0.031343777136954, 0.48712724040706, 0.51287275959294, 0.48712724040706, 0.012872759592938, 0.15379390707375, 0.17953942625959, 0.23712724040706, 0.012872759592938, 0.087127240407062, 0.11287275959294, 0.15379390707375, 0.012872759592919, 0.796763670868, 0.203236329132, 0.296763670868, 0.203236329132, 0.13009700420133, 0.203236329132, 0.046763670868003, 0.203236329132, 0.19676367086802, 0.0032363291319825, 0.13009700420133, 0.036569662465335, 0.70857038109546, 0.29142961890454, 0.20857038109546, 0.29142961890454, 0.041903714428789, 0.29142961890454, 0.20857038109546, 0.041429618904544, 0.10857038109546, 0.091429618904544, 0.041903714428789, 0.12476295223788, 0.19889118489624, 0.80110881510376, 0.19889118489624, 0.30110881510376, 0.19889118489626, 0.13444214843707, 0.19889118489624, 0.05110881510376, 0.19889118489625, 0.0011088151037484, 0.032224518229593, 0.13444214843707, 0.24266322604541, 0.75733677395459, 0.24266322604541, 0.25733677395459, 0.24266322604541, 0.090670107287925, 0.24266322604541, 0.0073367739545915, 0.042663226045397, 0.1573367739546, 0.075996559378742, 0.090670107287925 };
static int g_bins48000[720]= { 4, 5, 9, 10, 14, 15, 18, 19, 23, 24, 28, 29, 4, 5, 9, 10, 14, 15, 19, 20, 24, 25, 29, 30, 5, 6, 10, 11, 15, 16, 21, 22, 26, 27, 31, 32, 5, 6, 11, 12, 16, 17, 22, 23, 27, 28, 33, 34, 5, 6, 11, 12, 17, 18, 23, 24, 29, 30, 35, 36, 6, 7, 12, 13, 18, 19, 25, 26, 31, 32, 37, 38, 6, 7, 13, 14, 19, 20, 26, 27, 33, 34, 39, 40, 7, 8, 14, 15, 21, 22, 28, 29, 35, 36, 42, 43, 7, 8, 14, 15, 22, 23, 29, 30, 37, 38, 44, 45, 7, 8, 15, 16, 23, 24, 31, 32, 39, 40, 47, 48, 8, 9, 16, 17, 25, 26, 33, 34, 41, 42, 50, 51, 8, 9, 17, 18, 26, 27, 35, 36, 44, 45, 53, 54, 9, 10, 18, 19, 28, 29, 37, 38, 46, 47, 56, 57, 9, 10, 19, 20, 29, 30, 39, 40, 49, 50, 59, 60, 10, 11, 21, 22, 31, 32, 42, 43, 52, 53, 63, 64, 11, 12, 22, 23, 33, 34, 44, 45, 55, 56, 66, 67, 11, 12, 23, 24, 35, 36, 47, 48, 59, 60, 70, 71, 12, 13, 25, 26, 37, 38, 50, 51, 62, 63, 75, 76, 13, 14, 26, 27, 39, 40, 53, 54, 66, 67, 79, 80, 14, 15, 28, 29, 42, 43, 56, 57, 70, 71, 84, 85, 14, 15, 29, 30, 44, 45, 59, 60, 74, 75, 89, 90, 15, 16, 31, 32, 47, 48, 63, 64, 78, 79, 94, 95, 16, 17, 33, 34, 50, 51, 66, 67, 83, 84, 100, 101, 17, 18, 35, 36, 53, 54, 70, 71, 88, 89, 106, 107, 18, 19, 37, 38, 56, 57, 75, 76, 93, 94, 112, 113, 19, 20, 39, 40, 59, 60, 79, 80, 99, 100, 119, 120, 21, 22, 42, 43, 63, 64, 84, 85, 105, 106, 126, 127, 22, 23, 44, 45, 66, 67, 89, 90, 111, 112, 133, 134, 23, 24, 47, 48, 70, 71, 94, 95, 118, 119, 141, 142, 25, 26, 50, 51, 75, 76, 100, 101, 125, 126, 150, 151, 26, 27, 53, 54, 79, 80, 106, 107, 132, 133, 159, 160, 28, 29, 56, 57, 84, 85, 112, 113, 140, 141, 168, 169, 29, 30, 59, 60, 89, 90, 119, 120, 149, 150, 178, 179, 31, 32, 63, 64, 94, 95, 126, 127, 157, 158, 189, 190, 33, 34, 66, 67, 100, 101, 133, 134, 167, 168, 200, 201, 35, 36, 70, 71, 106, 107, 141, 142, 177, 178, 212, 213, 37, 38, 75, 76, 112, 113, 150, 151, 187, 188, 225, 226, 39, 40, 79, 80, 119, 120, 159, 160, 198, 199, 238, 239, 42, 43, 84, 85, 126, 127, 168, 169, 210, 211, 252, 253, 44, 45, 89, 90, 133, 134, 178, 179, 223, 224, 267, 268, 47, 48, 94, 95, 141, 142, 189, 190, 236, 237, 283, 284, 50, 51, 100, 101, 150, 151, 200, 201, 250, 251, 300, 301, 53, 54, 106, 107, 159, 160, 212, 213, 265, 266, 318, 319, 56, 57, 112, 113, 168, 169, 225, 226, 281, 282, 337, 338, 59, 60, 119, 120, 178, 179, 238, 239, 298, 299, 357, 358, 63, 64, 126, 127, 189, 190, 252, 253, 315, 316, 378, 379, 66, 67, 133, 134, 200, 201, 267, 268, 334, 335, 401, 402, 70, 71, 141, 142, 212, 213, 283, 284, 354, 355, 425, 426, 75, 76, 150, 151, 225, 226, 300, 301, 375, 376, 450, 451, 79, 80, 159, 160, 238, 239, 318, 319, 397, 398, 477, 478, 84, 85, 168, 169, 252, 253, 337, 338, 421, 422, 505, 506, 89, 90, 178, 179, 267, 268, 357, 358, 446, 447, 535, 536, 94, 95, 189, 190, 283, 284, 378, 379, 473, 474, 567, 568, 100, 101, 200, 201, 300, 301, 400, 401, 501, 502, 601, 602, 106, 107, 212, 213, 318, 319, 424, 425, 530, 531, 637, 638, 112, 113, 225, 226, 337, 338, 450, 451, 562, 563, 675, 676, 119, 120, 238, 239, 357, 358, 476, 477, 596, 597, 715, 716, 126, 127, 252, 253, 378, 379, 505, 506, 631, 632, 757, 758, 133, 134, 267, 268, 401, 402, 535, 536, 669, 670, 802, 803, 141, 142, 283, 284, 425, 426, 567, 568, 708, 709, 850, 851 };

//Krumhansl Kessler profiles (normalised)
static double g_kkminor[12] = { 0.14221523253202, 0.060211188496967, 0.079083352055718, 0.12087171422152, 0.05841383958661, 0.079308020669512, 0.057065827903842, 0.10671759155246, 0.089418108290272, 0.060435857110762, 0.075039317007414, 0.071219950572905 };
static double g_kkmajor[12] = { 0.15195022732711, 0.053362048336923, 0.083273510409189, 0.055754965302704, 0.10480976310122, 0.097870303900455, 0.060301507537688, 0.12419239052405, 0.057190715482173, 0.087580760947595, 0.054797798516391, 0.068916008614501 };

//following Izmirli; see MIREX2006
static double g_diatonicmajor[12] = { 5.0, 0.0, 3.5, 0.0,  4.5, 4.0, 0.0, 4.5,  0.0, 3.5, 0.0, 4.0};
static double g_diatonicminor[12] = { 5.0, 0.0, 3.5, 4.5,  0.0, 4.0, 0.0, 4.5,  3.5, 0.0, 0.0, 4.0};

static int g_minor[7] = {0,2,3,5,7,8,11};
static int g_major[7] = {0,2,4,5,7,9,11};


//other functions
static void KeyClarity_calculatekey(KeyClarity *, uint32);


void KeyClarity_Ctor(KeyClarity* unit)
{
	unit->m_srate = unit->mWorld->mFullRate.mSampleRate;

	//if sample rate is 88200 or 96000, assume taking double size FFT to start with
	if(unit->m_srate > (44100.0*1.5)) unit->m_srate = unit->m_srate*0.5;

	if(((int)(unit->m_srate+0.01))==44100)
	{
		unit->m_weights = g_weights44100;
		unit->m_bins = g_bins44100;
		unit->m_frameperiod = 0.046439909297052;
	}
	else  //else 48000; potentially dangerous if it isn't! Fortunately, shouldn't write any data to unknown memory
	{
		unit->m_weights = g_weights48000;
		unit->m_bins = g_bins48000;
		unit->m_frameperiod = 0.042666666666667;
	}

	//only need space for half!
	unit->m_FFTBuf = (float*)RTAlloc(unit->mWorld, NOVER2 * sizeof(float));

	//zero chroma
	Clear(12, unit->m_chroma);
	Clear(24, unit->m_key);
	Clear(24, unit->m_histogram);

	//for(j=0;j<60;++j) {
//		unit->m_leaknote[j]=0.0;
//	}

//	for(j=0;j<360;++j) {
//		unit->m_prevphase[j]=0.0;
//	}

	//triggers
	//unit->m_triggerid=(int)ZIN0(1);

	unit->m_currentKey=0;
    unit->m_currentMaxCorrelation= 0.0f; 

	//unit->m_frame=0;

	unit->mCalcFunc = (UnitCalcFunc)&KeyClarity_next;
}


void KeyClarity_Dtor(KeyClarity *unit)
{
	RTFree(unit->mWorld, unit->m_FFTBuf);
}


void KeyClarity_next(KeyClarity *unit, int wrongNumSamples)
{
	//int numSamples = unit->mWorld->mFullRate.mBufLength;

	//float *output = ZOUT(0);

	float fbufnum = ZIN0(0)+0.001;

	//next FFT bufffer ready, update
	//assuming at this point that buffer precalculated for any resampling
	if (fbufnum > -0.01f) {  // && ( ZIN0(3)<0.5)

		//unit->m_frame= unit->m_frame+1;
		KeyClarity_calculatekey(unit, (uint32)fbufnum);
	}

	//always output current best key
	float outval= unit->m_currentMaxCorrelation; //unit->m_currentKey;

	//control rate output
	ZOUT0(0)=outval;
}


//calculation function once FFT data ready
void KeyClarity_calculatekey(KeyClarity *unit, uint32 ibufnum)
{
	World *world = unit->mWorld;
	
    SndBuf *buf;
    
    if (ibufnum >= world->mNumSndBufs) { 
		int localBufNum = ibufnum - world->mNumSndBufs; 
		Graph *parent = unit->mParent; 
		if(localBufNum <= parent->localBufNum) { 
			buf = parent->mLocalSndBufs + localBufNum; 
		} else { 
			buf = world->mSndBufs; 
			if(unit->mWorld->mVerbosity > -1){ Print("KeyClarity error: Buffer number overrun: %i\n", ibufnum); } 
		} 
	} else { 
		buf = world->mSndBufs + ibufnum; 
	} 
    
	LOCK_SNDBUF(buf);

	//assumed in this representation
	ToComplexApx(buf);

	const float * data= buf->data;

	//memcpy(unit->m_FFTBuf, data, NOVER2);

	//to hold powers
	float * fftbuf= unit->m_FFTBuf;

	//get powers for bins
	//don't need to calculate past half Nyquist, because no indices involved of harmonics above 10000 Hz or so (see index data at top of file)
	for (int i=0; i<NOVER2; i+=2) {
		//i>>1 is i/2
		fftbuf[i>>1] = ((data[i] * data[i]) + (data[i+1] * data[i+1]));
	}


	float * chroma= unit->m_chroma;

	float sum;
	int indexbase, index;

	//experimental; added leaky integration on each note; also, only add to sum if harmonic, ie not a transient

	float * weights = unit->m_weights;
	int * bins = unit->m_bins;

	float chromaleak= ZIN0(2);

	//zero for new round (should add leaky integrator here!
	for (int i=0;i<12;++i)
		chroma[i] *= chromaleak;

	for (int i=0;i<60;++i) {
		int chromaindex = (i+9)%12; //starts at A1 up to G#6

		sum=0.0;

		indexbase= 12*i; //6 partials, 2 of each

		//transient sum, setting up last values too

		for(int j=0;j<12;++j) { //12 if 144 data points

			index=indexbase+j;

			//experimental transient detection code, not reliable
			//int binindex= unit->m_bins[index]-1;
			//SCPolar binnow= p->bin[binindex].ToPolarApx();
			//float phaseadvance= (binindex+1)*(TWOPI*0.5); //k * (512/44100) * (44100/1024) //convert bin number to frequency
			//float power= binnow.mag * binnow.mag; //(p->bin[binindex].real)*(p->bin[binindex].real) + (p->bin[binindex].imag)*(p->bin[binindex].imag); //(p->bin[binindex].mag);
			//power *= power;

			//int phaseindex= indexbase+j;
			//float phasenow= binnow.phase; //0.0; //(p->bin[binindex].phase);
			//float prevphase = fmod(unit->m_prevphase[index]+phaseadvance,TWOPI);
			//float a,b,tmp;
			//a=phasenow; b=prevphase;
			//b=phasenow; a=prevphase;

			//if(b<a) {b= b+TWOPI;}

			//float phasechange = sc_min(b-a,a+TWOPI-b); //more complicated, need mod 2pi and to know lower and upper
			//phasesum+= phasechange;
			//unit->m_prevphase[index]= phasenow;

			//((p->bin[index-1].mag) * (p->bin[index-1].mag))

			//printf("comparison %f %f \n",fftbuf[g_bins2[index]], power);
			//sum+= (unit->m_weights[index])* power;

			sum+= (weights[index])* (fftbuf[bins[index]]);
		}


		//transient test here too?
		//if(phasesum>(5*PI)){sum=0.0;}

		//if((i>5) && (i<15))
		//printf("test phasesum %f \n", phasesum);
		//unit->m_leaknote[i] = (0.8*unit->m_leaknote[i]) + sum;

		chroma[chromaindex]+= sum; //unit->m_leaknote[i]; //sum;
	}

	float* key = unit->m_key;

    
    //normalize chroma within reason (e.g. if energy too low, don't touch)
    
    float maxchromaval = 0.0f; 
    
    for (int i=0;i<12;++i)
		if (chroma[i]>maxchromaval) maxchromaval= chroma[i];
    
    if(maxchromaval>0.1f) {
        
        maxchromaval = 1.0f/maxchromaval;
        
        for (int i=0;i<12;++i)
            chroma[i] *= maxchromaval; 
    }
    
    
	//major
	for (int i=0;i<12;++i) {

		sum=0.0;
		for (int j=0;j<7;++j) {
			indexbase=g_major[j];

			index=(i+indexbase)%12;
			sum+=(chroma[index]*g_kkmajor[indexbase]);

			//sum+=(chroma[index]*g_diatonicmajor[indexbase]);

		}

		key[i]=sum; //10*log10(sum+1);
	}

	//minor
	for (int i=0;i<12;++i) {

		sum=0.0;
		for (int j=0;j<7;++j) {
			indexbase=g_minor[j];

			index=(i+indexbase)%12;
			sum+=(chroma[index]*g_kkminor[indexbase]);

			//sum+=(chroma[index]*g_diatonicminor[indexbase]);

		}

		key[12+i]=sum;
	}

	float keyleak= ZIN0(1); //fade parameter to 0.01 for histogram in seconds, convert to FFT frames

	//keyleak in seconds, convert to drop time in FFT hop frames (FRAMEPERIOD)
	keyleak= sc_max(0.001f,keyleak/unit->m_frameperiod); //FRAMEPERIOD;

	//now number of frames, actual leak param is decay exponent to reach 0.01 in x seconds, ie 0.01 = leakparam ** (x/ffthopsize)
	//0.01 is -40dB
	keyleak= pow(0.01f,(1.f/keyleak));

	float * histogram= unit->m_histogram;

	int bestkey=0;
	float bestscore=0.0;

	for (int i=0;i<24;++i) {
		histogram[i]= (keyleak*histogram[i])+key[i];

		if(histogram[i]>bestscore) {
			bestscore=histogram[i];
			bestkey=i;
		}

	//printf("%f ",histogram[i]);
	}

	//should find secondbest and only swap if win by a margin

	//printf(" best %d \n\n",bestkey);
	//what is winning currently? find max in histogram
	unit->m_currentKey=bestkey;
    unit->m_currentMaxCorrelation = bestscore; 
	//about 5 times per second
	//if((unit->m_triggerid) && ((unit->m_frame%2==0))) SendTrigger(&unit->mParent->mNode, unit->m_triggerid, bestkey);
}



PluginLoad(KeyClarity) {
	
	init_SCComplex(inTable);
	
	ft = inTable;
    
	DefineDtorCantAliasUnit(KeyClarity);
    
}