Chris@366: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ Chris@366: /* Chris@366: Constant-Q library Chris@366: Copyright (c) 2013-2014 Queen Mary, University of London Chris@366: Chris@366: Permission is hereby granted, free of charge, to any person Chris@366: obtaining a copy of this software and associated documentation Chris@366: files (the "Software"), to deal in the Software without Chris@366: restriction, including without limitation the rights to use, copy, Chris@366: modify, merge, publish, distribute, sublicense, and/or sell copies Chris@366: of the Software, and to permit persons to whom the Software is Chris@366: furnished to do so, subject to the following conditions: Chris@366: Chris@366: The above copyright notice and this permission notice shall be Chris@366: included in all copies or substantial portions of the Software. Chris@366: Chris@366: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, Chris@366: EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF Chris@366: MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND Chris@366: NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY Chris@366: CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF Chris@366: CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION Chris@366: WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Chris@366: Chris@366: Except as contained in this notice, the names of the Centre for Chris@366: Digital Music; Queen Mary, University of London; and Chris Cannam Chris@366: shall not be used in advertising or otherwise to promote the sale, Chris@366: use or other dealings in this Software without prior written Chris@366: authorization. Chris@366: */ Chris@366: Chris@366: #include "Pitch.h" Chris@366: Chris@366: #include Chris@366: Chris@366: float Chris@366: Pitch::getFrequencyForPitch(int midiPitch, Chris@366: float centsOffset, Chris@366: float concertA) Chris@366: { Chris@366: float p = float(midiPitch) + (centsOffset / 100); Chris@366: return concertA * powf(2.0, (p - 69.0) / 12.0); Chris@366: } Chris@366: Chris@366: int Chris@366: Pitch::getPitchForFrequency(float frequency, Chris@366: float *centsOffsetReturn, Chris@366: float concertA) Chris@366: { Chris@366: float p = 12.0 * (log(frequency / (concertA / 2.0)) / log(2.0)) + 57.0; Chris@366: Chris@366: int midiPitch = int(p + 0.00001); Chris@366: float centsOffset = (p - midiPitch) * 100.0; Chris@366: Chris@366: if (centsOffset >= 50.0) { Chris@366: midiPitch = midiPitch + 1; Chris@366: centsOffset = -(100.0 - centsOffset); Chris@366: } Chris@366: Chris@366: if (centsOffsetReturn) *centsOffsetReturn = centsOffset; Chris@366: return midiPitch; Chris@366: } Chris@366: