Unity 8
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volumepeakdetector.h
1 /*
2  * Copyright (C) 2012, 2013 Canonical, Ltd.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; version 3.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program. If not, see <http://www.gnu.org/licenses/>.
15  */
16 
17 #ifndef VOLUMEPEAKDETECTOR_H
18 #define VOLUMEPEAKDETECTOR_H
19 
20 #include <QObject>
21 
22 #include <QThread>
23 
24 #include <pulse/pulseaudio.h>
25 
26 class PulseAudioVolumePeakDetector : public QObject
27 {
28  Q_OBJECT
29 
30 public:
31  PulseAudioVolumePeakDetector();
32 
33  int nAccumulatedValuesLimit() const;
34  void setNAccumulatedValuesLimit(int limit);
35 
36  void startStream();
37  void processData();
38  void quit();
39 
40 public Q_SLOTS:
41  void start();
42 
43 Q_SIGNALS:
44  void newPeak(float value);
45 
46 private:
47  float m_accumulatedValue;
48  int m_nAccumulatedValues;
49  int m_accumulatedValuesLimit;
50  pa_context *m_context;
51  pa_mainloop_api *m_mainloop_api;
52  pa_stream *m_stream;
53 };
54 
55 class VolumePeakDetector : public QObject
56 {
57  Q_OBJECT
58  Q_PROPERTY(bool enabled READ enabled WRITE setEnabled)
59  Q_PROPERTY(int desiredInterval READ desiredInterval WRITE setDesiredInterval)
60 
61 public:
62  VolumePeakDetector();
63 
64  bool enabled() const;
65  void setEnabled(int enabled);
66 
67  int desiredInterval() const;
68  void setDesiredInterval(int interval);
69 
70 Q_SIGNALS:
71  void newPeak(float volume);
72 
73 private:
74  QThread m_thread;
75  PulseAudioVolumePeakDetector m_volumeDetector;
76 };
77 
78 #endif