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/* voiceman.h - The VoiceManager class handles a set of voices for synths
This file is part of LibKMid 0.9.5
Copyright (C) 1997,98,99,2000 Antonio Larrosa Jimenez
LibKMid's homepage : http://www.arrakis.es/~rlarrosa/libkmid.html
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
Send comments and bug fixes to Antonio Larrosa <larrosa@kde.org>
***************************************************************************/
#ifndef _VOICEMAN_H
#define _VOICEMAN_H
/**
* @internal
* Manages the voices used by synthesizers.
*
* @short Manages internally the voices used by synth devices.
* @version 0.9.5 17/01/2000
* @author Antonio Larrosa Jimenez <larrosa@kde.org>
*/
class VoiceManager
{
private:
class VoiceManagerPrivate;
VoiceManagerPrivate *d;
/**
* Number of voices managed by this object.
*/
int nvoices;
/**
* @internal
*/
struct voice
{
int id;
int channel;
int note;
int used;
struct voice *prev;
struct voice *next;
};
/**
* Points to the beginning of the voice list, that is, to
* the older voice which is ready to be used.
*/
voice *FirstVoice;
/**
* Points to the last voice, that is, the latest (most recently) used voice.
*/
voice *LastVoice;
/**
* Points to the latest (list order) not used voice,
* that is, to where deallocated voices will be moved.
*/
voice *LastnotusedVoice;
/**
* Array with pointers to the voices, arranged by ID for allow faster searches.
*/
voice **VoiceList;
/**
* @internal
* This variable is used to search channels.
*/
voice *searcher;
/**
* @internal
* An auxiliary variable for simpler searches.
*/
voice *searcher_aid;
public:
/**
* Cronstructor.
*/
VoiceManager(int totalvoices);
/**
* Destructor.
*/
~VoiceManager();
/**
* Allocates a voice used in channel @p chn, and playing key @p key
* @return the voice that should be used.
*
* @see deallocateVoice
*/
int allocateVoice(int chn,int key);
/**
* Deallocates the voice with ID @p id.
*
* @see allocateVoice
*/
void deallocateVoice(int id);
/**
* initSearch() must be called always before search() to initialize
* internal variables.
*
* @see search
*/
void initSearch(void);
/**
* Returns -1 if channel chn is not currently used, or a voice using
* channel @p chn if any.
*
* Calling search repeteadly, will return all the voices using channel
* @p chn, and a -1 after the last one.
*
* @see initSearch
*/
int search(int chn);
//returns -1 if channel chn is not currently used
// Continue searching for more voices which
// use the channel chn
/**
* This is a convenience function that differs from the above in that it also
* looks for a specific note (the second parameter)
*
* @see initSearch
*/
int search(int chn,int note);
/**
* Returns the channel that voice @p v is using.
*/
int channel(int v) {return VoiceList[v]->channel;}
/**
* Returns the note that voice @p v is playing.
*/
int note(int v) {return VoiceList[v]->note;}
/**
* Returns true or false if the voice @p v is being used or not respectively.
*/
int used(int v) {return VoiceList[v]->used;}
/**
* Clears the lists of used voices.
*/
void clearLists(void);
};
#endif
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