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/*
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////////////////////////////////////////////////////////////////////////
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Copyright (c) 2002-2003 by Carlos Jim�nez de Parga
All rights reserved.
For any suggestion or failure report, please contact me by:
e-mail: cjimenez@isometrica.net
Note: I would appreciate very much if you could provide a brief description of your project,
as well as any report on bugs or errors. This will help me improve the code for the benefit of your
application and the other users
///////////////////////////////////////////////////////////////////////
Version: 2.2b
Module : Dmhelp.cpp
Purpose: Code implementation for the help functions
Created: CJP / 02-08-2002
History: CJP / 03-10-2003
Date format: Day-month-year
Update: 20/09/2002
1. Improved class destructors
2. Check member variables for NULL values before performing an operation
3. Restructured the class system
4. Better method to enumerate and select MIDI ports
5. Adapted the external thread to a pure virtual function
6. SysEx reception and sending enabled
7. Added flexible conversion functions
8. Find out how to activate the Microsoft software synth.
9. Added DLS support
Update: 25/03/2003
10. Added exception handling
11. Fixed bugs with channel groups
12. Redesigned class hierarchy
13. DirectMidi wrapped in the directmidi namespace
14. UNICODE/MBCS support for instruments and ports
15. Added DELAY effect to software synthesizer ports
16. Project released under GNU (General Public License) terms
Update: 03/10/2003
17. Redesigned class interfaces
18. Safer input port termination thread
19. New CMasterClock class
20. DLS files can be loaded from resources
21. DLS instruments note range support
22. New CSampleInstrument class added to the library
23. Direct download of samples to wave-table memory
24. .WAV file sample format supported
25. New methods added to the output port class
26. Fixed small bugs
*/
#include "CDirectMidi.h"
#include <math.h>
// Calculates 32-bit Time cents
// secs = seconds
// Time cents = log2(time[secs])*1200*65536;
TCENT directmidi::TimeCents(double nTime)
{
return (nTime == 0) ? 0x80000000 : static_cast<TCENT>((log(nTime)/log(2.0))*1200.0*65536.0);
}
// Calculates 32-bit Absolute Pitch cents
// f = linear frequency
// Pitch cents = (log2(f/440)*1200+6900)*65536
PCENT directmidi::PitchCents(double nFrequency)
{
return static_cast<PCENT>(((log(nFrequency/440.0)/log(2.0))*1200.0+6900.0)*65536.0);
}
// Calculates 32-bit Relative gain
// v = voltage V = Reference voltage
// Gain cents = log10(v/V)*200*65536
GCENT directmidi::GainCents(double nVoltage,double nRefVoltage)
{
return (nVoltage == 0 || nRefVoltage == 0) ? 0x80000000 : static_cast<GCENT>(log10(nVoltage/nRefVoltage)*200.0*65536.0);
}
// Calculates 32-bit 0.1% units
// percent = value between 0 and 100
// Percent units = percent*10*65536
PCENT directmidi::PercentUnits(double nPercent)
{
return static_cast<PCENT>(nPercent*10.0*65536.0);
}
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I obtained my PhD degree in Computer Graphics at the National Distance Education University (UNED) in October 2019. I also hold a Ms. degree in Software Engineering and Computer Systems and a Bs. degree in Computer Science from the National Distance Education University (UNED).
I have been employed as a C++ software developer in several companies since year 2000.
I currently work as a Tutor-Professor of Symbolic Logic, Discrete Math and Java Object-Oriented Programming at UNED-Cartagena (Spain) since 2015.