Diffstat (limited to 'noncore/multimedia/powerchord/chordengine.cpp') (more/less context) (ignore whitespace changes)
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diff --git a/noncore/multimedia/powerchord/chordengine.cpp b/noncore/multimedia/powerchord/chordengine.cpp new file mode 100644 index 0000000..d8c3c4e --- a/dev/null +++ b/noncore/multimedia/powerchord/chordengine.cpp @@ -0,0 +1,297 @@ +// +// ChordEngine class to calculate chords +// + +// Copyright (c) 2001 Camilo Mesias +// camilo@mesias.co.uk +// +// derived from JavaScript code by Jim Cranwell, used with permission +// +// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + +#include <stdio.h> + +#include <string.h> + +#include "chordengine.h" + +ChordEngine::ChordEngine(){ + + string[0] = OPEN; + string[1] = OPEN; + string[2] = OPEN; + string[3] = OPEN; + string[4] = OPEN; + string[5] = OPEN; + + base_note = 0; + chord_type = 0; + fret_pos = OPEN; + span_size = 1; + variation = 7; + tuning = 0; + + js_tunit(tuning); + js_whatchord(chord_type); + js_vboy(variation); + + label_text[0] = 0; +} + +int ChordEngine::finger(int f){ + return string[f]; +} +#define BREAK (401) +void ChordEngine::calculate(){ + + sprintf(label_text, "%s %s %s%s", + notes[base_note], + (chord_type)?keys[chord_type]:"", + (fret_pos==OPEN)?"":"fret-", + (fret_pos)?frets[fret_pos]:""); + + string[0] = + string[1] = + string[2] = + string[3] = + string[4] = + string[5] = MUTED; + + for (int in=0;in<6;in++){ + notename[in]=0; + } + + js_tunit(tuning); + // js_MMM[0] = 4; + //js_MMM[1] = 9; + //js_MMM[2] = 2; + //js_MMM[3] = 7; + //js_MMM[4] = 11; + //js_MMM[5] = 4; + + int js_D = base_note; + + int js_Q = span_size; + + js_Q += 2; + + int js_V = variation; + + int js_FR = fret_pos; + + int js_G = 0; + + int js_A = 0; + + if (js_FR){ + js_G = 8; + } + + js_L = 1; + js_Y = 1; + js_Z = 1; + + js_vboy(variation); + + js_Y += js_Q; + int js_K = 0; + int js_W = js_D - js_Z; + int js_H = -js_Z; + int js_N[6] = {0, 0, 0, 0, 0, 0}; + int js_TCK[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; + int js_E = 0; + int js_X = 0; + + for (int j=0; j<41; j++){ + js_A = 0; + for (int b=0; b<7; b++){ + if (js_N[b] == 1){ + js_A++; + } + if ((js_A==6)||(j>39)){ + for (int i=0; i<12; i++){ + if (js_TCK[i] != js_T[i]){ + memset((void *)js_N, 0, 6*sizeof(int)); + memset((void *)js_TCK, 0, 12*sizeof(int)); + js_V++; + js_X++; + if (js_V>23){ + js_V = 0; + } + js_vboy(js_V); + j = 0; + i = BREAK; + b = BREAK; + if (js_X > 23){ + js_N[0] = js_N[1] = js_N[2] = js_N[3] = js_N[4] = js_N[5] = 1; + j = BREAK; + } + } + } + } + } + int js_S = 0; + js_W = (js_W + js_Z)%12; + js_H = (js_H + js_Z)%12; + + while (js_S < js_Y){ + js_S++; + if (js_E > js_Q){ + js_E = 0; + js_K = (js_K + js_L)%6; + } + if (js_E<0){ + js_E = js_Q; + js_K = (js_K + js_L)%6; + } + if (js_T[js_H] == 0){ + for (int c=0;c<13;c++){ + js_W = (js_W+js_Z)%12; + js_H = (js_H+js_Z)%12; + if (js_T[js_H] == 1){ + c=BREAK; + } + } + } + if (js_N[js_K] == 1){ + for(int b=0; b<7; b++){ + js_K = (js_K+js_L)%6; + if(js_N[js_K] == 0){ + b = BREAK; + } + if(b==6){ + js_S = BREAK; + } + } + } + + // js_K is the index of the string + // js_MMM is the base note played by that string in the current tuning + // js_FR is the fret position + // js_E + // js_F represents the note made by this string here + // js_N[] records if we have found a finger position for this string + // js_W - represents the note we want???? + + int js_F = (js_MMM[js_K]+js_E+js_FR)%12; + + if ((js_W==js_F)&&(js_N[js_K]==0)){ + + int js_EG = js_E+js_G; + + string[js_K] = js_EG; + notename[js_K] = notes[js_W]; + + js_N[js_K] = 1; + js_TCK[js_H] = 1; + js_S = BREAK; + } + js_E += js_VM; + + } + + } + +} + + +const int ChordEngine::alt_tunings[][6] = { + {4, 9,2,7,11,4}, + {4,11,4,8,11,4}, + {4, 9,4,9, 1,4}, + {4, 9,2,6,11,4}, + {4, 9,2,7, 0,5}, + {2, 9,2,7, 9,2}, + {2, 7,0,7, 0,2}, + {2, 9,2,6, 9,2}, + {2, 9,2,7,11,4}, + {2, 7,2,7,11,2}, + {2, 9,2,9, 0,2}, + {0, 7,0,7, 9,4}, + {5, 9,2,7,11,4}, + {7,10,2,7,10,2}, +}; + +void ChordEngine::js_tunit(int t){ + int max=0; + int octave=0; + for (int i=0;i<6;i++){ + js_MMM[i] = ChordEngine::alt_tunings[t][i]; + if (js_MMM[i] < max){ + octave += 12; + } + max = js_MMM[i]; + note_indices[i] = octave + js_MMM[i]; + } +} + +const int ChordEngine::chordbases[][12] = { + {1,0,0,0,1,0,0,1,0,0,0,0}, // maj + {1,0,0,1,0,0,0,1,0,0,0,0}, // min + {1,0,0,0,1,0,0,1,0,0,1,0}, // 7th + {1,0,0,1,0,0,0,1,0,0,1,0}, // m7 + {1,0,0,0,1,0,0,1,0,0,0,1}, // maj7 + {1,0,0,0,1,0,0,1,0,1,0,0}, // 6th + {1,0,0,1,0,0,0,1,0,1,0,0}, // m6th + {1,0,0,0,1,0,0,0,1,0,0,0}, // aug + {1,0,0,1,0,0,1,0,0,1,0,0}, // dim + {1,0,0,0,0,1,0,1,0,0,0,0}, // sus4 + {1,0,0,0,0,1,0,1,0,0,1,0}, // 7sus4 + {1,0,1,0,1,0,0,1,0,0,1,0}, // 9th + {1,0,1,0,1,0,0,1,0,0,0,0}, // add9 + {1,0,1,1,0,0,0,1,0,0,1,0}, // m9th + {1,1,0,0,1,0,0,1,0,0,0,1}, // maj9 + {1,0,1,0,0,0,0,1,0,0,0,0}, // sus2 + {1,0,1,0,0,0,0,1,0,0,1,0}, // 7sus2 + {1,0,1,0,0,1,0,1,0,0,1,0}, // 11th + {1,0,1,1,0,1,0,1,0,0,1,0}, // m11th + {1,0,0,0,1,0,0,1,0,1,1,0}, // 13th + {1,0,0,1,0,0,0,1,0,1,1,0}, // m13th + {1,0,0,1,0,0,0,1,0,1,0,1}, // maj13 + {1,0,1,0,1,0,0,1,0,1,0,0}, // 6/9 + {1,0,0,0,1,0,1,0,0,0,0,0}, // flat5 + {1,0,0,1,1,0,0,0,0,0,1,0}, // 7#9 + {1,0,0,1,0,0,1,0,0,0,1,0}, // Ø7 + {1,0,0,0,0,0,0,1,0,0,0,0}, // 5 +}; + +void ChordEngine::js_whatchord(int c){ + for (int i=0;i<12;i++){ + js_T[i] = ChordEngine::chordbases[c][i]; + } +} + +void ChordEngine::js_vboy(int v){ + js_L = ((v/3)%2)?5:1; + js_Y = ((v/6)%2)?45:4; + js_Z = (v%3 == 0)?1:(v%3 == 1)?7:11; + js_VM = ((v/12)%2)?-1:1; +} + +const char* ChordEngine::notes[] = {"C", "C#", "D", "Eb", "E", "F", "F#", "G", "G#", "A", "Bb", "B", 0}; + +const char* ChordEngine::keys[] = {"maj", "min", "7th", "m7", "maj7", "6th", "m6th", "aug", "dim", "sus4", "7sus4", "9th", "add9", "m9th", "maj9", "sus2", "7sus2", "11th", "m11th", "13th", "m13th", "maj13", "6|9", "flat5", "7#9", "Ø7", "5", 0}; + +const char* ChordEngine::frets[] = {"open", "1st", "2nd", "3rd", "4th", "5th", "6th", "7th", "8th", "9th", "10th", "11th", "12th", "13th", "14th", "15th", "16th", 0}; + +const char* ChordEngine::variations[] = {"V1", "V2", "V3", "V4", "V5", "V6", "V7", "V8", "V9", "V10", "V11", "V12", "V13", "V14", "V15", "V16", "V17", "V18", "V19", "V20", "V21", "V22", "V23", 0}; + +const char* ChordEngine::tunings[] = {"EADGBE", "EBEG#BE", "EAEAC#E", "EADF#BE", "EADGCF", "DADGAD", "DGCGCD", "DADF#AD", "DADGBE", "DGDGBD", "DADACD", "CGCGAE", "FADGBE", "Gminor",0}; + + + + + |