summaryrefslogtreecommitdiffstats
path: root/src/3rdparty/phonon/mmf/abstractaudioeffect.h
blob: 9b9c47d2566b5f2898f33e6c4f04677cac80acaa (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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
/*  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/>.

*/

#ifndef PHONON_MMF_ABSTRACTEFFECT_H
#define PHONON_MMF_ABSTRACTEFFECT_H

#include <QScopedPointer>

#include <AudioEffectBase.h>

#include <Phonon/EffectInterface>

#include "audioplayer.h"
#include "effectparameter.h"
#include "mmf_medianode.h"
#include "mmf_videoplayer.h"

class CMdaAudioOutputStream;

QT_BEGIN_NAMESPACE

namespace Phonon
{
namespace MMF
{
class AbstractPlayer;
class AbstractMediaPlayer;

/**
 * @short Base class for all effects for MMF.
 *
 * Adhering to Phonon with MMF is cumbersome because of a number of reasons:
 *
 * - MMF has no concept of effect chaining. Simply, an effect is a applied
 *   to PlayerUtility, that's it. This means that the order of effects is
 *   undefined.
 * - We apply an effect to a PlayerUtility, and MediaObject has that one.
 *   However, effects might be created before MediaObject, but nevertheless
 *   needs to work. We solve this by that we are aware of the whole connection
 *   chain, and whenever a connection happens, we walk the chain, find effects
 *   that aren't applied, and apply it if we have a media object.
 * - There are plenty of corner cases which we don't handle and where behavior
 *   are undefined. For instance, graphs with more than one MediaObject.
 */
class AbstractAudioEffect : public MediaNode
                          , public EffectInterface
{
    Q_OBJECT
    Q_INTERFACES(Phonon::EffectInterface)
public:
    AbstractAudioEffect(QObject *parent,
                        const QList<EffectParameter> &params);

    // Phonon::EffectInterface
    virtual QList<Phonon::EffectParameter> parameters() const;
    virtual QVariant parameterValue(const Phonon::EffectParameter &param) const;
    virtual void setParameterValue(const Phonon::EffectParameter &,
                                   const QVariant &newValue);

public Q_SLOTS:
    void abstractPlayerChanged(AbstractPlayer *player);
    void stateChanged(Phonon::State newState,
                      Phonon::State oldState);

protected:
    // MediaNode
    void connectMediaObject(MediaObject *mediaObject);
    void disconnectMediaObject(MediaObject *mediaObject);

    virtual void createEffect(AudioPlayer::NativePlayer *player) = 0;

    virtual void parameterChanged(const EffectParameter &param,
                                  const QVariant &value) = 0;

private:
    void createEffect();
    const EffectParameter& internalParameter(int id) const;

protected:
    QScopedPointer<CAudioEffect>    m_effect;

private:
    const QList<EffectParameter>    m_params;
    AbstractMediaPlayer *           m_player;
    QHash<int, QVariant>            m_values;
};

}
}


// Macro for defining functions which depend on the native class name
// for each of the effects.  Using this reduces repetition of boilerplate
// in the implementations of the backend effect nodes.

#define PHONON_MMF_DEFINE_EFFECT_FUNCTIONS(Effect)                      \
                                                                        \
void Effect##::createEffect(AudioPlayer::NativePlayer *player)          \
{                                                                       \
    C##Effect *ptr = 0;                                                 \
    QT_TRAP_THROWING(ptr = C##Effect::NewL(*player));                   \
    m_effect.reset(ptr);                                                \
}                                                                       \
                                                                        \
C##Effect* Effect::concreteEffect()                                     \
{                                                                       \
    return static_cast<C##Effect *>(m_effect.data());                   \
}

QT_END_NAMESPACE

#endif