blob: 0e34d3c81a235cd8c6ad7382dac58d9ea0fa49ac (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright (C) 2007-2017 Paul Davis <paul@linuxaudiosystems.com>
* Copyright (C) 2009 David Robillard <d@drobilla.net>
* Copyright (C) 2010-2011 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2019 Robin Gareus <robin@gareus.org>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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) {
if (_zero_latency == en) {
return;
}
_zero_latency = en;
DisableSwitchChanged (); /* EMIT SIGNAL */
}
static bool zero_latency () {
return _zero_latency;
}
static PBD::Signal0<void> DisableSwitchChanged;
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__*/
|
