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/*
Copyright (C) 1999-2009 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_latent_h__
#define __ardour_latent_h__
#include "pbd/signals.h"
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
namespace ARDOUR {
class LIBARDOUR_API HasLatency {
public:
virtual ~HasLatency() {}
virtual samplecnt_t signal_latency() const = 0;
};
class LIBARDOUR_API Latent : public HasLatency {
public:
Latent ();
Latent (Latent const&);
virtual ~Latent() {}
/* effective latency to be used while processing */
samplecnt_t effective_latency() const {
if (_zero_latency) {
return 0;
} else if (_use_user_latency) {
return _user_latency;
} else {
return signal_latency ();
}
}
/* custom user-set latency, if any */
samplecnt_t user_latency () const {
if (_use_user_latency) {
return _user_latency;
} else {
return 0;
}
}
void unset_user_latency () {
_use_user_latency = false;
_user_latency = 0;
}
virtual void set_user_latency (samplecnt_t val) {
_use_user_latency = true;
_user_latency = val;
}
static void force_zero_latency (bool en) {
_zero_latency = en;
}
static bool zero_latency () {
return _zero_latency;
}
PBD::Signal0<void> LatencyChanged;
protected:
int set_state (const XMLNode& node, int version);
void add_state (XMLNode*) const;
private:
samplecnt_t _use_user_latency;
samplecnt_t _user_latency;
static bool _zero_latency;
};
} /* namespace */
#endif /* __ardour_latent_h__*/
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