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
|
/* 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 <AudioEqualizerBase.h>
#include "audioequalizer.h"
QT_BEGIN_NAMESPACE
using namespace Phonon;
using namespace Phonon::MMF;
/*! \class MMF::AudioEqualizer
\internal
*/
// Define functions which depend on concrete native effect class name
PHONON_MMF_DEFINE_EFFECT_FUNCTIONS(AudioEqualizer)
AudioEqualizer::AudioEqualizer(QObject *parent, const QList<EffectParameter>& parameters)
: AbstractAudioEffect::AbstractAudioEffect(parent, parameters)
{
}
void AudioEqualizer::parameterChanged(const int pid,
const QVariant &value)
{
if (m_effect.data()) {
const int band = pid;
const qreal level = value.toReal();
setBandLevel(band, level);
}
}
void AudioEqualizer::applyParameters()
{
if (m_effect.data()) {
Phonon::EffectParameter param;
foreach (param, parameters()) {
const int band = param.id();
const qreal level = parameterValue(param).toReal();
setBandLevel(band, level);
}
}
}
void AudioEqualizer::setBandLevel(int band, qreal externalLevel)
{
const EffectParameter ¶m = m_params[band-1]; // Band IDs are 1-based
const int internalLevel = param.toInternalValue(externalLevel);
// TODO: handle audio effect errors
TRAP_IGNORE(concreteEffect()->SetBandLevelL(band, internalLevel));
}
//-----------------------------------------------------------------------------
// Static functions
//-----------------------------------------------------------------------------
const char* AudioEqualizer::description()
{
return "Audio equalizer";
}
bool AudioEqualizer::getParameters(CMdaAudioOutputStream *stream,
QList<EffectParameter>& parameters)
{
bool supported = false;
QScopedPointer<CAudioEqualizer> effect;
TRAPD(err, effect.reset(CAudioEqualizer::NewL(*stream)));
if (KErrNone == err) {
supported = true;
TInt32 dbMin;
TInt32 dbMax;
effect->DbLevelLimits(dbMin, dbMax);
const int bandCount = effect->NumberOfBands();
// For some reason, band IDs are 1-based, as opposed to the
// 0-based indices used in just about other Symbian API...!
for (int i = 1; i <= bandCount; ++i) {
const qint32 hz = effect->CenterFrequency(i);
// We pass a floating-point parameter range of -1.0 to +1.0 for
// each band in order to work around a limitation in
// Phonon::EffectWidget. See documentation of EffectParameter
// for more details.
EffectParameter param(
/* parameterId */ i,
/* name */ tr("%1 Hz").arg(hz),
/* hints */ EffectParameter::LogarithmicHint,
/* defaultValue */ QVariant(qreal(0.0)),
/* minimumValue */ QVariant(qreal(-1.0)),
/* maximumValue */ QVariant(qreal(+1.0)));
param.setInternalRange(dbMin, dbMax);
parameters.append(param);
}
}
return supported;
}
QT_END_NAMESPACE
|
