AVFoundation: implemented QMediaPlayer::seekable.

Change-Id: Iaca8daa2460062954497b3e510dd1828953c80fd
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>

src/plugins/avfoundation/mediaplayer/avfmediaplayercontrol.mm

@@ -65,6 +65,8 @@ void AVFMediaPlayerControl::setSession(AVFMediaPlayerSession *session)
     connect(m_session, SIGNAL(error(int,QString)), this, SIGNAL(error(int,QString)));
     connect(m_session, &AVFMediaPlayerSession::playbackRateChanged,
             this, &AVFMediaPlayerControl::playbackRateChanged);
+    connect(m_session, &AVFMediaPlayerSession::seekableChanged,
+            this, &AVFMediaPlayerControl::seekableChanged);
 }
 
 QMediaPlayer::State AVFMediaPlayerControl::state() const

src/plugins/avfoundation/mediaplayer/avfmediaplayersession.h

@@ -109,6 +109,7 @@ Q_SIGNALS:
     void audioAvailableChanged(bool audioAvailable);
     void videoAvailableChanged(bool videoAvailable);
     void playbackRateChanged(qreal rate);
+    void seekableChanged(bool seekable);
     void error(int error, const QString &errorString);
 
 private:
@@ -151,6 +152,7 @@ private:
 
     void setAudioAvailable(bool available);
     void setVideoAvailable(bool available);
+    void setSeekable(bool seekable);
 
     AVFMediaPlayerService *m_service;
     AVFVideoOutput *m_videoOutput;
@@ -171,6 +173,7 @@ private:
     qint64 m_duration;
     bool m_videoAvailable;
     bool m_audioAvailable;
+    bool m_seekable;
 
     void *m_observer;
 };

src/plugins/avfoundation/mediaplayer/avfmediaplayersession.mm

@@ -377,6 +377,7 @@ AVFMediaPlayerSession::AVFMediaPlayerSession(AVFMediaPlayerService *service, QOb
     , m_duration(0)
     , m_videoAvailable(false)
     , m_audioAvailable(false)
+    , m_seekable(false)
 {
     m_observer = [[AVFMediaPlayerSessionObserver alloc] initWithMediaPlayerSession:this];
 }
@@ -453,6 +454,7 @@ void AVFMediaPlayerSession::setMedia(const QMediaContent &content, QIODevice *st
 
     setAudioAvailable(false);
     setVideoAvailable(false);
+    setSeekable(false);
     m_requestedPosition = -1;
     Q_EMIT positionChanged(position());
 
@@ -554,7 +556,16 @@ bool AVFMediaPlayerSession::isVideoAvailable() const
 
 bool AVFMediaPlayerSession::isSeekable() const
 {
-    return true;
+    return m_seekable;
+}
+
+void AVFMediaPlayerSession::setSeekable(bool seekable)
+{
+    if (m_seekable == seekable)
+        return;
+
+    m_seekable = seekable;
+    Q_EMIT seekableChanged(seekable);
 }
 
 QMediaTimeRange AVFMediaPlayerSession::availablePlaybackRanges() const
@@ -806,6 +817,8 @@ void AVFMediaPlayerSession::processLoadStateChange()
                 }
             }
 
+            setSeekable([[playerItem seekableTimeRanges] count] > 0);
+
             // Get the native size of the video, and reset the bounds of the player layer
             AVPlayerLayer *playerLayer = [(AVFMediaPlayerSessionObserver*)m_observer playerLayer];
             if (videoTrack && playerLayer) {