Mercurial > hg > svcore
view base/Pitch.cpp @ 1008:d9e0e59a1581
When using an aggregate model to pass data to a transform, zero-pad the shorter input to the duration of the longer rather than truncating the longer. (This is better behaviour for e.g. MATCH, and in any case the code was previously truncating incorrectly and ending up with garbage data at the end.)
author | Chris Cannam |
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date | Fri, 14 Nov 2014 13:51:33 +0000 |
parents | 451f7f3ab6e7 |
children | d1ce7a4a920b |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 Chris Cannam. 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. See the file COPYING included with this distribution for more information. */ #include "Pitch.h" #include "Preferences.h" #include "system/System.h" #include <cmath> float Pitch::getFrequencyForPitch(int midiPitch, float centsOffset, float concertA) { if (concertA <= 0.0) { concertA = Preferences::getInstance()->getTuningFrequency(); } float p = float(midiPitch) + (centsOffset / 100); return concertA * powf(2.0, (p - 69.0) / 12.0); } int Pitch::getPitchForFrequency(float frequency, float *centsOffsetReturn, float concertA) { if (concertA <= 0.0) { concertA = Preferences::getInstance()->getTuningFrequency(); } float p = 12.0 * (log(frequency / (concertA / 2.0)) / log(2.0)) + 57.0; int midiPitch = int(p + 0.00001); float centsOffset = (p - midiPitch) * 100.0; if (centsOffset >= 50.0) { midiPitch = midiPitch + 1; centsOffset = -(100.0 - centsOffset); } if (centsOffsetReturn) *centsOffsetReturn = centsOffset; return midiPitch; } int Pitch::getPitchForFrequencyDifference(float frequencyA, float frequencyB, float *centsOffsetReturn, float concertA) { if (concertA <= 0.0) { concertA = Preferences::getInstance()->getTuningFrequency(); } if (frequencyA > frequencyB) { std::swap(frequencyA, frequencyB); } float pA = 12.0 * (log(frequencyA / (concertA / 2.0)) / log(2.0)) + 57.0; float pB = 12.0 * (log(frequencyB / (concertA / 2.0)) / log(2.0)) + 57.0; float p = pB - pA; int midiPitch = int(p + 0.00001); float centsOffset = (p - midiPitch) * 100.0; if (centsOffset >= 50.0) { midiPitch = midiPitch + 1; centsOffset = -(100.0 - centsOffset); } if (centsOffsetReturn) *centsOffsetReturn = centsOffset; return midiPitch; } static QString notes[] = { "C%1", "C#%1", "D%1", "D#%1", "E%1", "F%1", "F#%1", "G%1", "G#%1", "A%1", "A#%1", "B%1" }; static QString flatNotes[] = { "C%1", "Db%1", "D%1", "Eb%1", "E%1", "F%1", "Gb%1", "G%1", "Ab%1", "A%1", "Bb%1", "B%1" }; QString Pitch::getPitchLabel(int midiPitch, float centsOffset, bool useFlats) { int baseOctave = Preferences::getInstance()->getOctaveOfLowestMIDINote(); int octave = baseOctave; // Note, this only gets the right octave number at octave // boundaries because Cb is enharmonic with B (not B#) and B# is // enharmonic with C (not Cb). So neither B# nor Cb will be // spelled from a MIDI pitch + flats flag in isolation. if (midiPitch < 0) { while (midiPitch < 0) { midiPitch += 12; --octave; } } else { octave = midiPitch / 12 + baseOctave; } QString plain = (useFlats ? flatNotes : notes)[midiPitch % 12].arg(octave); int ic = lrintf(centsOffset); if (ic == 0) return plain; else if (ic > 0) return QString("%1+%2c").arg(plain).arg(ic); else return QString("%1%2c").arg(plain).arg(ic); } QString Pitch::getPitchLabelForFrequency(float frequency, float concertA, bool useFlats) { if (concertA <= 0.0) { concertA = Preferences::getInstance()->getTuningFrequency(); } float centsOffset = 0.0; int midiPitch = getPitchForFrequency(frequency, ¢sOffset, concertA); return getPitchLabel(midiPitch, centsOffset, useFlats); } QString Pitch::getLabelForPitchRange(int semis, float cents) { if (semis > 0) { while (cents < 0.f) { --semis; cents += 100.f; } } if (semis < 0) { while (cents > 0.f) { ++semis; cents -= 100.f; } } int ic = lrintf(cents); if (ic == 0) { if (semis >= 12) { return QString("%1'%2").arg(semis/12).arg(semis - 12*(semis/12)); } else { return QString("%1").arg(semis); } } else { if (ic > 0) { if (semis >= 12) { return QString("%1'%2+%3c").arg(semis/12).arg(semis - 12*(semis/12)).arg(ic); } else { return QString("%1+%3c").arg(semis).arg(ic); } } else { if (semis >= 12) { return QString("%1'%2%3c").arg(semis/12).arg(semis - 12*(semis/12)).arg(ic); } else { return QString("%1%3c").arg(semis).arg(ic); } } } } bool Pitch::isFrequencyInMidiRange(float frequency, float concertA) { float centsOffset = 0.0; int midiPitch = getPitchForFrequency(frequency, ¢sOffset, concertA); return (midiPitch >= 0 && midiPitch < 128); }