Mercurial > hg > svcore
view base/Pitch.cpp @ 299:576be0d0d218
* Merge transform directory from sv-match-alignment branch
(the previous comment included notes for this stuff, but I missed it
in the actual merge)
* Fix crash when a transform fails to create an output model and the
thread that created the transform then deletes its input model thinking
it's no longer needed, even though the transform run thread is still
using it -- fix is to wait() on the transform before returning the
null output model
author | Chris Cannam |
---|---|
date | Fri, 28 Sep 2007 16:15:06 +0000 |
parents | e412f65884ee |
children | 0a44caddd9fe |
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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 <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; } 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 octave = -2; if (midiPitch < 0) { while (midiPitch < 0) { midiPitch += 12; --octave; } } else { octave = midiPitch / 12 - 2; } 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); } bool Pitch::isFrequencyInMidiRange(float frequency, float concertA) { float centsOffset = 0.0; int midiPitch = getPitchForFrequency(frequency, ¢sOffset, concertA); return (midiPitch >= 0 && midiPitch < 128); }