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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/* This file is part of the KDE project.
Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2.1 or 3 of the License.
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "volumefadereffect.h"
#include "common.h"
#include <QtCore>
QT_BEGIN_NAMESPACE
namespace Phonon
{
namespace Gstreamer
{
VolumeFaderEffect::VolumeFaderEffect(Backend *backend, QObject *parent)
: Effect(backend, parent, AudioSource | AudioSink)
, m_fadeCurve(Phonon::VolumeFaderEffect::Fade3Decibel)
, m_fadeTimer(0)
, m_fadeDuration(0)
, m_fadeFromVolume(0)
, m_fadeToVolume(0)
{
m_effectElement = gst_element_factory_make ("volume", NULL);
if (m_effectElement)
init();
}
VolumeFaderEffect::~VolumeFaderEffect()
{
if (m_fadeTimer)
killTimer(m_fadeTimer);
}
GstElement* VolumeFaderEffect::createEffectBin()
{
GstElement *audioBin = gst_bin_new(NULL);
// We need a queue to handle tee-connections from parent node
GstElement *queue= gst_element_factory_make ("queue", NULL);
gst_bin_add(GST_BIN(audioBin), queue);
GstElement *mconv= gst_element_factory_make ("audioconvert", NULL);
gst_bin_add(GST_BIN(audioBin), mconv);
gst_bin_add(GST_BIN(audioBin), m_effectElement);
// Link src pad
GstPad *srcPad= gst_element_get_pad (m_effectElement, "src");
gst_element_add_pad (audioBin, gst_ghost_pad_new ("src", srcPad));
gst_object_unref (srcPad);
// Link sink pad
gst_element_link_many(queue, mconv, m_effectElement, (const char*)NULL);
GstPad *sinkpad = gst_element_get_pad (queue, "sink");
gst_element_add_pad (audioBin, gst_ghost_pad_new ("sink", sinkpad));
gst_object_unref (sinkpad);
return audioBin;
}
float VolumeFaderEffect::volume() const
{
gdouble val = 0.0;
if (m_effectElement)
g_object_get(G_OBJECT(m_effectElement), "volume", &val, (const char*)NULL);
return (float)val;
}
void VolumeFaderEffect::setVolume(float volume)
{
g_object_set(G_OBJECT(m_effectElement), "volume", volume, (const char*)NULL);
}
Phonon::VolumeFaderEffect::FadeCurve VolumeFaderEffect::fadeCurve() const
{
return m_fadeCurve;
}
void VolumeFaderEffect::setFadeCurve(Phonon::VolumeFaderEffect::FadeCurve fadeCurve)
{
m_fadeCurve = fadeCurve;
}
void VolumeFaderEffect::fadeTo(float targetVolume, int fadeTime)
{
m_fadeToVolume = targetVolume;
m_fadeDuration = fadeTime;
m_fadeFromVolume = volume();
m_fadeStartTime.start();
if (m_fadeTimer)
killTimer(m_fadeTimer);
m_fadeTimer = startTimer(30);
}
void VolumeFaderEffect::updateFade()
{
double currVal = 0.0;
float step = float(m_fadeStartTime.elapsed()) / float(m_fadeDuration);
if (step > 1){
step = 1;
if (m_fadeTimer) {
killTimer(m_fadeTimer);
m_fadeTimer = 0;
}
}
// This is a very loose and interpretation of the API
// But in fact when fading between arbitrary values, the decibel values make no sense
// Note : seems like we will change the API to re-use names from QTimeline for this
switch (fadeCurve()) {
case Phonon::VolumeFaderEffect::Fade3Decibel: // Slow in the beginning
currVal = step * step;
break;
case Phonon::VolumeFaderEffect::Fade6Decibel: // Linear fade
currVal = step;
break;
case Phonon::VolumeFaderEffect::Fade9Decibel: // Fast in the beginning / Linear
currVal = step * 0.5 + (1.0-(1.0-step)*(1.0-step)) * 0.5;
break;
case Phonon::VolumeFaderEffect::Fade12Decibel: // Fast in the beginning
currVal = 1.0 - (1.0-step) * (1.0-step);
break;
default:
break;
}
const double volume = (1.0 - currVal) * m_fadeFromVolume + currVal * m_fadeToVolume;
setVolume(volume);
}
bool VolumeFaderEffect::event(QEvent *event)
{
switch (event->type()){
case QEvent::Timer:
{
QTimerEvent *timerEvent = static_cast<QTimerEvent *>(event);
if (timerEvent->timerId() == m_fadeTimer)
updateFade();
break;
}
default:
break;
}
return QObject::event(event);
}
}} //namespace Phonon::Gstreamer
QT_END_NAMESPACE
#include "moc_volumefadereffect.cpp"
|
