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
|
/* 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 "mediaobject.h"
#include "mmf_medianode.h"
QT_BEGIN_NAMESPACE
using namespace Phonon;
using namespace Phonon::MMF;
/*! \class MMF::MediaNode
\internal
*/
MMF::MediaNode::MediaNode(QObject *parent) : QObject::QObject(parent)
, m_source(0)
, m_target(0)
, m_isApplied(false)
{
}
bool MMF::MediaNode::connectMediaNode(MediaNode *target)
{
m_target = target;
m_target->setSource(this);
return applyNodesOnMediaObject(target);
}
bool MMF::MediaNode::disconnectMediaNode(MediaNode *target)
{
Q_UNUSED(target);
m_target = 0;
m_isApplied = false;
return false;
}
void MMF::MediaNode::setSource(MediaNode *source)
{
m_source = source;
}
MMF::MediaNode *MMF::MediaNode::source() const
{
return m_source;
}
MMF::MediaNode *MMF::MediaNode::target() const
{
return m_target;
}
bool MMF::MediaNode::applyNodesOnMediaObject(MediaNode *)
{
// Algorithmically, this can be expressed in a more efficient way by
// exercising available assumptions, but it complicates code for input
// data(length of the graph) which typically is very small.
// First, we go to the very beginning of the graph.
MMF::MediaNode *current = this;
do {
MediaNode *const candidate = current->source();
if (candidate)
current = candidate;
else
break;
}
while (current);
// Now we do two things, while walking to the other end:
// 1. Find the MediaObject, if present
// 2. Collect a list of all unapplied MediaNodes
QList<MediaNode *> unapplied;
MMF::MediaObject *mo = 0;
do {
if (!current->m_isApplied)
unapplied.append(current);
if (!mo)
mo = qobject_cast<MMF::MediaObject *>(current);
current = current->target();
}
while (current);
// Now, lets activate all the objects, if we found the MediaObject.
if (mo) {
for (int i = 0; i < unapplied.count(); ++i) {
MediaNode *const at = unapplied.at(i);
// We don't want to apply MediaObject on itself.
if (at != mo)
at->activateOnMediaObject(mo);
}
}
return true;
}
QT_END_NAMESPACE
|
