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Diffstat (limited to 'arts/midi/audiotimer.h')
-rw-r--r-- | arts/midi/audiotimer.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arts/midi/audiotimer.h b/arts/midi/audiotimer.h new file mode 100644 index 00000000..f0299cf3 --- /dev/null +++ b/arts/midi/audiotimer.h @@ -0,0 +1,73 @@ + /* + + Copyright (C) 2002 Stefan Westerfeld + stefan@space.twc.de + + 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 |