summaryrefslogtreecommitdiffstats
path: root/src/gsttools/qgstreamerplayercontrol.cpp
blob: 689467db82c24787c49e46317a152bfcb9a67fb0 (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
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <private/qgstreamerplayercontrol_p.h>
#include <private/qgstreamerplayersession_p.h>

#include <private/qmediaplaylistnavigator_p.h>
#include <private/qmediaresourcepolicy_p.h>
#include <private/qmediaresourceset_p.h>

#include <QtCore/qdir.h>
#include <QtCore/qsocketnotifier.h>
#include <QtCore/qurl.h>
#include <QtCore/qdebug.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

//#define DEBUG_PLAYBIN

QT_BEGIN_NAMESPACE

QGstreamerPlayerControl::QGstreamerPlayerControl(QGstreamerPlayerSession *session, QObject *parent)
    : QMediaPlayerControl(parent)
    , m_session(session)
{
    m_resources = QMediaResourcePolicy::createResourceSet<QMediaPlayerResourceSetInterface>();
    Q_ASSERT(m_resources);

    connect(m_session, &QGstreamerPlayerSession::positionChanged, this, &QGstreamerPlayerControl::positionChanged);
    connect(m_session, &QGstreamerPlayerSession::durationChanged, this, &QGstreamerPlayerControl::durationChanged);
    connect(m_session, &QGstreamerPlayerSession::mutedStateChanged, this, &QGstreamerPlayerControl::mutedChanged);
    connect(m_session, &QGstreamerPlayerSession::volumeChanged, this, &QGstreamerPlayerControl::volumeChanged);
    connect(m_session, &QGstreamerPlayerSession::stateChanged, this, &QGstreamerPlayerControl::updateSessionState);
    connect(m_session, &QGstreamerPlayerSession::bufferingProgressChanged, this, &QGstreamerPlayerControl::setBufferProgress);
    connect(m_session, &QGstreamerPlayerSession::playbackFinished, this, &QGstreamerPlayerControl::processEOS);
    connect(m_session, &QGstreamerPlayerSession::audioAvailableChanged, this, &QGstreamerPlayerControl::audioAvailableChanged);
    connect(m_session, &QGstreamerPlayerSession::videoAvailableChanged, this, &QGstreamerPlayerControl::videoAvailableChanged);
    connect(m_session, &QGstreamerPlayerSession::seekableChanged, this, &QGstreamerPlayerControl::seekableChanged);
    connect(m_session, &QGstreamerPlayerSession::error, this, &QGstreamerPlayerControl::error);
    connect(m_session, &QGstreamerPlayerSession::invalidMedia, this, &QGstreamerPlayerControl::handleInvalidMedia);
    connect(m_session, &QGstreamerPlayerSession::playbackRateChanged, this, &QGstreamerPlayerControl::playbackRateChanged);

    connect(m_resources, &QMediaPlayerResourceSetInterface::resourcesGranted, this, &QGstreamerPlayerControl::handleResourcesGranted);
    //denied signal should be queued to have correct state update process,
    //since in playOrPause, when acquire is call on resource set, it may trigger a resourcesDenied signal immediately,
    //so handleResourcesDenied should be processed later, otherwise it will be overwritten by state update later in playOrPause.
    connect(m_resources, &QMediaPlayerResourceSetInterface::resourcesDenied,
            this, &QGstreamerPlayerControl::handleResourcesDenied, Qt::QueuedConnection);
    connect(m_resources, &QMediaPlayerResourceSetInterface::resourcesLost, this, &QGstreamerPlayerControl::handleResourcesLost);
}

QGstreamerPlayerControl::~QGstreamerPlayerControl()
{
    QMediaResourcePolicy::destroyResourceSet(m_resources);
}

QMediaPlayerResourceSetInterface* QGstreamerPlayerControl::resources() const
{
    return m_resources;
}

qint64 QGstreamerPlayerControl::position() const
{
    if (m_mediaStatus == QMediaPlayer::EndOfMedia)
        return m_session->duration();

    return m_pendingSeekPosition != -1 ? m_pendingSeekPosition : m_session->position();
}

qint64 QGstreamerPlayerControl::duration() const
{
    return m_session->duration();
}

QMediaPlayer::State QGstreamerPlayerControl::state() const
{
    return m_currentState;
}

QMediaPlayer::MediaStatus QGstreamerPlayerControl::mediaStatus() const
{
    return m_mediaStatus;
}

int QGstreamerPlayerControl::bufferStatus() const
{
    if (m_bufferProgress == -1) {
        return m_session->state() == QMediaPlayer::StoppedState ? 0 : 100;
    } else
        return m_bufferProgress;
}

int QGstreamerPlayerControl::volume() const
{
    return m_session->volume();
}

bool QGstreamerPlayerControl::isMuted() const
{
    return m_session->isMuted();
}

bool QGstreamerPlayerControl::isSeekable() const
{
    return m_session->isSeekable();
}

QMediaTimeRange QGstreamerPlayerControl::availablePlaybackRanges() const
{
    return m_session->availablePlaybackRanges();
}

qreal QGstreamerPlayerControl::playbackRate() const
{
    return m_session->playbackRate();
}

void QGstreamerPlayerControl::setPlaybackRate(qreal rate)
{
    m_session->setPlaybackRate(rate);
}

void QGstreamerPlayerControl::setPosition(qint64 pos)
{
#ifdef DEBUG_PLAYBIN
    qDebug() << Q_FUNC_INFO << pos/1000.0;
#endif

    pushState();

    if (m_mediaStatus == QMediaPlayer::EndOfMedia) {
        m_mediaStatus = QMediaPlayer::LoadedMedia;
    }

    if (m_currentState == QMediaPlayer::StoppedState) {
        m_pendingSeekPosition = pos;
        emit positionChanged(m_pendingSeekPosition);
    } else if (m_session->isSeekable()) {
        m_session->showPrerollFrames(true);
        m_session->seek(pos);
        m_pendingSeekPosition = -1;
    } else if (m_session->state() == QMediaPlayer::StoppedState) {
        m_pendingSeekPosition = pos;
        emit positionChanged(m_pendingSeekPosition);
    } else if (m_pendingSeekPosition != -1) {
        m_pendingSeekPosition = -1;
        emit positionChanged(m_pendingSeekPosition);
    }

    popAndNotifyState();
}

void QGstreamerPlayerControl::play()
{
#ifdef DEBUG_PLAYBIN
    qDebug() << Q_FUNC_INFO;
#endif
    //m_userRequestedState is needed to know that we need to resume playback when resource-policy
    //regranted the resources after lost, since m_currentState will become paused when resources are
    //lost.
    m_userRequestedState = QMediaPlayer::PlayingState;
    playOrPause(QMediaPlayer::PlayingState);
}

void QGstreamerPlayerControl::pause()
{
#ifdef DEBUG_PLAYBIN
    qDebug() << Q_FUNC_INFO;
#endif
    m_userRequestedState = QMediaPlayer::PausedState;
    // If the playback has not been started yet but pause is requested.
    // Seek to the beginning to show first frame.
    if (m_pendingSeekPosition == -1 && m_session->position() == 0)
        m_pendingSeekPosition = 0;

    playOrPause(QMediaPlayer::PausedState);
}

void QGstreamerPlayerControl::playOrPause(QMediaPlayer::State newState)
{
    if (m_mediaStatus == QMediaPlayer::NoMedia)
        return;

    pushState();

    if (m_setMediaPending) {
        m_mediaStatus = QMediaPlayer::LoadingMedia;
        setMedia(m_currentResource, m_stream);
    }

    if (m_mediaStatus == QMediaPlayer::EndOfMedia && m_pendingSeekPosition == -1) {
        m_pendingSeekPosition = 0;
    }

    if (!m_resources->isGranted())
        m_resources->acquire();

    if (m_resources->isGranted()) {
        // show prerolled frame if switching from stopped state
        if (m_pendingSeekPosition == -1) {
            m_session->showPrerollFrames(true);
        } else if (m_session->state() == QMediaPlayer::StoppedState) {
            // Don't evaluate the next two conditions.
        } else if (m_session->isSeekable()) {
            m_session->pause();
            m_session->showPrerollFrames(true);
            m_session->seek(m_pendingSeekPosition);
            m_pendingSeekPosition = -1;
        } else {
            m_pendingSeekPosition = -1;
        }

        bool ok = false;

        //To prevent displaying the first video frame when playback is resumed
        //the pipeline is paused instead of playing, seeked to requested position,
        //and after seeking is finished (position updated) playback is restarted
        //with show-preroll-frame enabled.
        if (newState == QMediaPlayer::PlayingState && m_pendingSeekPosition == -1)
            ok = m_session->play();
        else
            ok = m_session->pause();

        if (!ok)
            newState = QMediaPlayer::StoppedState;
    }

    if (m_mediaStatus == QMediaPlayer::InvalidMedia)
        m_mediaStatus = QMediaPlayer::LoadingMedia;

    m_currentState = newState;

    if (m_mediaStatus == QMediaPlayer::EndOfMedia || m_mediaStatus == QMediaPlayer::LoadedMedia) {
        if (m_bufferProgress == -1 || m_bufferProgress == 100)
            m_mediaStatus = QMediaPlayer::BufferedMedia;
        else
            m_mediaStatus = QMediaPlayer::BufferingMedia;
    }

    popAndNotifyState();

    emit positionChanged(position());
}

void QGstreamerPlayerControl::stop()
{
#ifdef DEBUG_PLAYBIN
    qDebug() << Q_FUNC_INFO;
#endif
    m_userRequestedState = QMediaPlayer::StoppedState;

    pushState();

    if (m_currentState != QMediaPlayer::StoppedState) {
        m_currentState = QMediaPlayer::StoppedState;
        m_session->showPrerollFrames(false); // stop showing prerolled frames in stop state
        // Since gst is not going to send GST_STATE_PAUSED
        // when pipeline is already paused,
        // needs to update media status directly.
        if (m_session->state() == QMediaPlayer::PausedState)
            updateMediaStatus();
        else if (m_resources->isGranted())
            m_session->pause();

        if (m_mediaStatus != QMediaPlayer::EndOfMedia) {
            m_pendingSeekPosition = 0;
            emit positionChanged(position());
        }
    }

    popAndNotifyState();
}

void QGstreamerPlayerControl::setVolume(int volume)
{
    m_session->setVolume(volume);
}

void QGstreamerPlayerControl::setMuted(bool muted)
{
    m_session->setMuted(muted);
}

QMediaContent QGstreamerPlayerControl::media() const
{
    return m_currentResource;
}

const QIODevice *QGstreamerPlayerControl::mediaStream() const
{
    return m_stream;
}

void QGstreamerPlayerControl::setMedia(const QMediaContent &content, QIODevice *stream)
{
#ifdef DEBUG_PLAYBIN
    qDebug() << Q_FUNC_INFO;
#endif

    pushState();

    m_currentState = QMediaPlayer::StoppedState;
    QMediaContent oldMedia = m_currentResource;
    m_pendingSeekPosition = -1;
    m_session->showPrerollFrames(false); // do not show prerolled frames until pause() or play() explicitly called
    m_setMediaPending = false;

    if (!content.isNull() || stream) {
        if (!m_resources->isGranted())
            m_resources->acquire();
    } else {
        m_resources->release();
    }

    m_session->stop();

    bool userStreamValid = false;

    if (m_bufferProgress != -1) {
        m_bufferProgress = -1;
        emit bufferStatusChanged(0);
    }

    m_currentResource = content;
    m_stream = stream;

    QNetworkRequest request = content.request();

    if (m_stream)
        userStreamValid = stream->isOpen() && m_stream->isReadable();

#if !QT_CONFIG(gstreamer_app)
    m_session->loadFromUri(request);
#else
    if (m_stream) {
        if (userStreamValid){
            m_session->loadFromStream(request, m_stream);
        } else {
            m_mediaStatus = QMediaPlayer::InvalidMedia;
            emit error(QMediaPlayer::FormatError, tr("Attempting to play invalid user stream"));
            if (m_currentState != QMediaPlayer::PlayingState)
                m_resources->release();
            popAndNotifyState();
            return;
        }
    } else
        m_session->loadFromUri(request);
#endif

#if QT_CONFIG(gstreamer_app)
    if (!request.url().isEmpty() || userStreamValid) {
#else
    if (!request.url().isEmpty()) {
#endif
        m_mediaStatus = QMediaPlayer::LoadingMedia;
        m_session->pause();
    } else {
        m_mediaStatus = QMediaPlayer::NoMedia;
        setBufferProgress(0);
    }

    if (m_currentResource != oldMedia)
        emit mediaChanged(m_currentResource);

    emit positionChanged(position());

    if (content.isNull() && !stream)
        m_resources->release();

    popAndNotifyState();
}

void QGstreamerPlayerControl::setVideoOutput(QObject *output)
{
    m_session->setVideoRenderer(output);
}

bool QGstreamerPlayerControl::isAudioAvailable() const
{
    return m_session->isAudioAvailable();
}

bool QGstreamerPlayerControl::isVideoAvailable() const
{
    return m_session->isVideoAvailable();
}

void QGstreamerPlayerControl::updateSessionState(QMediaPlayer::State state)
{
    pushState();

    if (state == QMediaPlayer::StoppedState) {
        m_session->showPrerollFrames(false);
        m_currentState = QMediaPlayer::StoppedState;
    }

    if (state == QMediaPlayer::PausedState && m_currentState != QMediaPlayer::StoppedState) {
        if (m_pendingSeekPosition != -1 && m_session->isSeekable()) {
            m_session->showPrerollFrames(true);
            m_session->seek(m_pendingSeekPosition);
        }
        m_pendingSeekPosition = -1;

        if (m_currentState == QMediaPlayer::PlayingState) {
            if (m_bufferProgress == -1 || m_bufferProgress == 100)
                m_session->play();
        }
    }

    updateMediaStatus();

    popAndNotifyState();
}

void QGstreamerPlayerControl::updateMediaStatus()
{
    //EndOfMedia status should be kept, until reset by pause, play or setMedia
    if (m_mediaStatus == QMediaPlayer::EndOfMedia)
        return;

    pushState();
    QMediaPlayer::MediaStatus oldStatus = m_mediaStatus;

    switch (m_session->state()) {
    case QMediaPlayer::StoppedState:
        if (m_currentResource.isNull())
            m_mediaStatus = QMediaPlayer::NoMedia;
        else if (oldStatus != QMediaPlayer::InvalidMedia)
            m_mediaStatus = QMediaPlayer::LoadingMedia;
        break;

    case QMediaPlayer::PlayingState:
    case QMediaPlayer::PausedState:
        if (m_currentState == QMediaPlayer::StoppedState) {
            m_mediaStatus = QMediaPlayer::LoadedMedia;
        } else {
            if (m_bufferProgress == -1 || m_bufferProgress == 100)
                m_mediaStatus = QMediaPlayer::BufferedMedia;
            else
                m_mediaStatus = QMediaPlayer::StalledMedia;
        }
        break;
    }

    if (m_currentState == QMediaPlayer::PlayingState && !m_resources->isGranted())
        m_mediaStatus = QMediaPlayer::StalledMedia;

    popAndNotifyState();
}

void QGstreamerPlayerControl::processEOS()
{
    pushState();
    m_mediaStatus = QMediaPlayer::EndOfMedia;
    emit positionChanged(position());
    m_session->endOfMediaReset();

    if (m_currentState != QMediaPlayer::StoppedState) {
        m_currentState = QMediaPlayer::StoppedState;
        m_session->showPrerollFrames(false); // stop showing prerolled frames in stop state
    }

    popAndNotifyState();
}

void QGstreamerPlayerControl::setBufferProgress(int progress)
{
    if (m_bufferProgress == progress || m_mediaStatus == QMediaPlayer::NoMedia)
        return;

#ifdef DEBUG_PLAYBIN
    qDebug() << Q_FUNC_INFO << progress;
#endif
    m_bufferProgress = progress;

    if (m_resources->isGranted()) {
        if (m_currentState == QMediaPlayer::PlayingState &&
                m_bufferProgress == 100 &&
                m_session->state() != QMediaPlayer::PlayingState)
            m_session->play();

        if (!m_session->isLiveSource() && m_bufferProgress < 100 &&
                (m_session->state() == QMediaPlayer::PlayingState ||
                 m_session->pendingState() == QMediaPlayer::PlayingState))
            m_session->pause();
    }

    updateMediaStatus();

    emit bufferStatusChanged(m_bufferProgress);
}

void QGstreamerPlayerControl::handleInvalidMedia()
{
    pushState();
    m_mediaStatus = QMediaPlayer::InvalidMedia;
    m_currentState = QMediaPlayer::StoppedState;
    m_setMediaPending = true;
    popAndNotifyState();
}

void QGstreamerPlayerControl::handleResourcesGranted()
{
    pushState();

    //This may be triggered when there is an auto resume
    //from resource-policy, we need to take action according to m_userRequestedState
    //rather than m_currentState
    m_currentState = m_userRequestedState;
    if (m_currentState != QMediaPlayer::StoppedState)
        playOrPause(m_currentState);
    else
        updateMediaStatus();

    popAndNotifyState();
}

void QGstreamerPlayerControl::handleResourcesLost()
{
    //on resource lost the pipeline should be paused
    //player status is changed to paused
    pushState();
    QMediaPlayer::State oldState = m_currentState;

    m_session->pause();

    if (oldState != QMediaPlayer::StoppedState )
        m_currentState = QMediaPlayer::PausedState;

    popAndNotifyState();
}

void QGstreamerPlayerControl::handleResourcesDenied()
{
    //on resource denied the pipeline should stay paused
    //player status is changed to paused
    pushState();

    if (m_currentState != QMediaPlayer::StoppedState )
        m_currentState = QMediaPlayer::PausedState;

    popAndNotifyState();
}

void QGstreamerPlayerControl::pushState()
{
    m_stateStack.push(m_currentState);
    m_mediaStatusStack.push(m_mediaStatus);
}

void QGstreamerPlayerControl::popAndNotifyState()
{
    Q_ASSERT(!m_stateStack.isEmpty());

    QMediaPlayer::State oldState = m_stateStack.pop();
    QMediaPlayer::MediaStatus oldMediaStatus = m_mediaStatusStack.pop();

    if (m_stateStack.isEmpty()) {
        if (m_mediaStatus != oldMediaStatus) {
#ifdef DEBUG_PLAYBIN
            qDebug() << "Media status changed:" << m_mediaStatus;
#endif
            emit mediaStatusChanged(m_mediaStatus);
        }

        if (m_currentState != oldState) {
#ifdef DEBUG_PLAYBIN
            qDebug() << "State changed:" << m_currentState;
#endif
            emit stateChanged(m_currentState);
        }
    }
}

QT_END_NAMESPACE