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/*
Copyright (C) 2002 Stefan Westerfeld
[email protected]
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef AUDIOTIMER_H
#define AUDIOTIMER_H
#include "artsmidi.h"
#include "artsflow.h"
#include "stdsynthmodule.h"
#include "miditimercommon.h"
#include "flowsystem.h"
namespace Arts {
/**
* EXPERIMENTAL (this interface will probably not stay this way) way to handle
* audio based time stamps. Callback interface.
*/
class AudioTimerCallback {
public:
virtual void updateTime() = 0;
};
/**
* EXPERIMENTAL (this interface will probably not stay this way) way to handle
* audio based time stamps. Timer class for audio timestamps.
*/
class AudioTimer : public SynthModule_skel, public StdSynthModule
/* we are a SynthModule to get the timing */
{
protected:
AudioTimer();
virtual ~AudioTimer();
std::list<AudioTimerCallback *> callbacks;
long samples; /* at most samplingRate, overflow goes in seconds */
long seconds;
public:
// allocation: share one AudioTimer for everbody who needs one
static AudioTimer *subscribe();
void unsubscribe() { _release(); }
void notify(const Notification& n);
TimeStamp time();
void calculateBlock(unsigned long samples);
void addCallback(AudioTimerCallback *callback);
void removeCallback(AudioTimerCallback *callback);
};
}
#endif
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