summaryrefslogtreecommitdiffstats
path: root/src/multimedia/mediaservices/base/qmediaobject.cpp
blob: 68fb29e5d473dcf50d4fe0f41bcc218644a09bf3 (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
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtMediaservics module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtCore/qmetaobject.h>

#include "qmediaobject_p.h"

#include <QtMediaServices/qmediaservice.h>
#include <QtMediaServices/qmetadatacontrol.h>


QT_BEGIN_NAMESPACE

void QMediaObjectPrivate::_q_notify()
{
    Q_Q(QMediaObject);

    const QMetaObject* m = q->metaObject();

    foreach (int pi, notifyProperties) {
        QMetaProperty p = m->property(pi);
        p.notifySignal().invoke(
            q, QGenericArgument(QMetaType::typeName(p.userType()), p.read(q).data()));
    }
}


/*!
    \class QMediaObject
    \preliminary
    \brief The QMediaObject class provides a common base for multimedia objects.
    \since 4.7

    \ingroup multimedia

    QMediaObject derived classes provide access to the functionality of a
    QMediaService.  Each media object hosts a QMediaService and uses the
    QMediaControl interfaces implemented by the service to implement its
    API.  Most media objects when constructed will request a new
    QMediaService instance from a QMediaServiceProvider, but some like
    QMediaRecorder will share a service with another object.

    QMediaObject itself provides an API for accessing a media service's \l {metaData()}{meta-data} and a means of connecting other media objects,
    and peripheral classes like QVideoWidget and QMediaPlaylist.

    \sa QMediaService, QMediaControl
*/

/*!
    Destroys a media object.
*/

QMediaObject::~QMediaObject()
{
    delete d_ptr;
}

/*!
    Returns the service availability error state.
*/

QtMediaServices::AvailabilityError QMediaObject::availabilityError() const
{
    return QtMediaServices::ServiceMissingError;
}

/*!
    Returns true if the service is available for use.
*/

bool QMediaObject::isAvailable() const
{
    return false;
}

/*!
    Returns the media service that provides the functionality of a multimedia object.
*/

QMediaService* QMediaObject::service() const
{
    return d_func()->service;
}

int QMediaObject::notifyInterval() const
{
    return d_func()->notifyTimer->interval();
}

void QMediaObject::setNotifyInterval(int milliSeconds)
{
    Q_D(QMediaObject);

    if (d->notifyTimer->interval() != milliSeconds) {
        d->notifyTimer->setInterval(milliSeconds);

        emit notifyIntervalChanged(milliSeconds);
    }
}

/*!
  \internal
*/
void QMediaObject::bind(QObject*)
{
}

/*!
  \internal
*/
void QMediaObject::unbind(QObject*)
{
}


/*!
    Constructs a media object which uses the functionality provided by a media \a service.

    The \a parent is passed to QObject.

    This class is meant as a base class for Multimedia objects so this
    constructor is protected.
*/

QMediaObject::QMediaObject(QObject *parent, QMediaService *service):
    QObject(parent),
    d_ptr(new QMediaObjectPrivate)

{
    Q_D(QMediaObject);

    d->q_ptr = this;

    d->notifyTimer = new QTimer(this);
    d->notifyTimer->setInterval(1000);
    connect(d->notifyTimer, SIGNAL(timeout()), SLOT(_q_notify()));

    d->service = service;

    setupMetaData();
}

/*!
    \internal
*/

QMediaObject::QMediaObject(QMediaObjectPrivate &dd, QObject *parent,
                                            QMediaService *service):
    QObject(parent),
    d_ptr(&dd)
{
    Q_D(QMediaObject);
    d->q_ptr = this;

    d->notifyTimer = new QTimer(this);
    d->notifyTimer->setInterval(1000);
    connect(d->notifyTimer, SIGNAL(timeout()), SLOT(_q_notify()));

    d->service = service;

    setupMetaData();
}

/*!
    Watch the property \a name. The property's notify signal will be emitted
    once every notifyInterval milliseconds.

    \sa notifyInterval
*/

void QMediaObject::addPropertyWatch(QByteArray const &name)
{
    Q_D(QMediaObject);

    const QMetaObject* m = metaObject();

    int index = m->indexOfProperty(name.constData());

    if (index != -1 && m->property(index).hasNotifySignal()) {
        d->notifyProperties.insert(index);

        if (!d->notifyTimer->isActive())
            d->notifyTimer->start();
    }
}

/*!
    Remove property \a name from the list of properties whose changes are
    regularly signaled.

    \sa notifyInterval
*/

void QMediaObject::removePropertyWatch(QByteArray const &name)
{
    Q_D(QMediaObject);

    int index = metaObject()->indexOfProperty(name.constData());

    if (index != -1) {
        d->notifyProperties.remove(index);

        if (d->notifyProperties.isEmpty())
            d->notifyTimer->stop();
    }
}

/*!
    \property QMediaObject::notifyInterval

    The interval at which notifiable properties will update.

    The interval is expressed in milliseconds, the default value is 1000.

    \sa addPropertyWatch(), removePropertyWatch()
*/

/*!
    \fn void QMediaObject::notifyIntervalChanged(int milliseconds)

    Signal a change in the notify interval period to \a milliseconds.
*/

/*!
    \property QMediaObject::metaDataAvailable
    \brief whether access to a media object's meta-data is available.

    If this is true there is meta-data available, otherwise there is no meta-data available.
*/

bool QMediaObject::isMetaDataAvailable() const
{
    Q_D(const QMediaObject);

    return d->metaDataControl
            ? d->metaDataControl->isMetaDataAvailable()
            : false;
}

/*!
    \fn QMediaObject::metaDataAvailableChanged(bool available)

    Signals that the \a available state of a media object's meta-data has changed.
*/

/*!
    \property QMediaObject::metaDataWritable
    \brief whether a media object's meta-data is writable.

    If this is true the meta-data is writable, otherwise the meta-data is read-only.
*/

bool QMediaObject::isMetaDataWritable() const
{
    Q_D(const QMediaObject);

    return d->metaDataControl
            ? d->metaDataControl->isWritable()
            : false;
}

/*!
    \fn QMediaObject::metaDataWritableChanged(bool writable)

    Signals that the \a writable state of a media object's meta-data has changed.
*/

/*!
    Returns the value associated with a meta-data \a key.
*/
QVariant QMediaObject::metaData(QtMediaServices::MetaData key) const
{
    Q_D(const QMediaObject);

    return d->metaDataControl
            ? d->metaDataControl->metaData(key)
            : QVariant();
}

/*!
    Sets a \a value for a meta-data \a key.
*/
void QMediaObject::setMetaData(QtMediaServices::MetaData key, const QVariant &value)
{
    Q_D(QMediaObject);

    if (d->metaDataControl)
        d->metaDataControl->setMetaData(key, value);
}

/*!
    Returns a list of keys there is meta-data available for.
*/
QList<QtMediaServices::MetaData> QMediaObject::availableMetaData() const
{
    Q_D(const QMediaObject);

    return d->metaDataControl
            ? d->metaDataControl->availableMetaData()
            : QList<QtMediaServices::MetaData>();
}

/*!
    \fn QMediaObject::metaDataChanged()

    Signals that a media object's meta-data has changed.
*/

/*!
    Returns the value associated with a meta-data \a key.

    The naming and type of extended meta-data is not standardized, so the values and meaning
    of keys may vary between backends.
*/
QVariant QMediaObject::extendedMetaData(const QString &key) const
{
    Q_D(const QMediaObject);

    return d->metaDataControl
            ? d->metaDataControl->extendedMetaData(key)
            : QVariant();
}

/*!
    Sets a \a value for a meta-data \a key.

    The naming and type of extended meta-data is not standardized, so the values and meaning
    of keys may vary between backends.
*/
void QMediaObject::setExtendedMetaData(const QString &key, const QVariant &value)
{
    Q_D(QMediaObject);

    if (d->metaDataControl)
        d->metaDataControl->setExtendedMetaData(key, value);
}

/*!
    Returns a list of keys there is extended meta-data available for.
*/
QStringList QMediaObject::availableExtendedMetaData() const
{
    Q_D(const QMediaObject);

    return d->metaDataControl
            ? d->metaDataControl->availableExtendedMetaData()
            : QStringList();
}


void QMediaObject::setupMetaData()
{
    Q_D(QMediaObject);

    if (d->service != 0) {
        d->metaDataControl =
            qobject_cast<QMetaDataControl*>(d->service->control(QMetaDataControl_iid));

        if (d->metaDataControl) {
            connect(d->metaDataControl, SIGNAL(metaDataChanged()), SIGNAL(metaDataChanged()));
            connect(d->metaDataControl,
                    SIGNAL(metaDataAvailableChanged(bool)),
                    SIGNAL(metaDataAvailableChanged(bool)));
            connect(d->metaDataControl,
                    SIGNAL(writableChanged(bool)),
                    SIGNAL(metaDataWritableChanged(bool)));
        }
    }
}

/*!
    \fn QMediaObject::availabilityChanged(bool available)

    Signal emitted when the availability state has changed to \a available
*/


#include "moc_qmediaobject.cpp"

QT_END_NAMESPACE