playback/player: qt: add simple playlist support and wire buttons

playback/player/qt/main.qml

@@ -43,6 +43,8 @@ ApplicationWindow {
         objectName: "player"
         volume: 0.5
         positionUpdateInterval: 100
+        autoPlay: false
+
         onStateChanged: {
             if (state === Player.STOPPED) {
                 playbutton.state = "play"
@@ -375,6 +377,11 @@ ApplicationWindow {
                         font.family: "FontAwesome"
                         text: FontAwesome.Icon.StepBackward
                     }
+
+                    MouseArea {
+                       anchors.fill: parent
+                       onPressed: player.previous()
+                    }
                 }
 
                 Item {
@@ -432,6 +439,11 @@ ApplicationWindow {
                         font.family: "FontAwesome"
                         text: FontAwesome.Icon.StepForward
                     }
+
+                    MouseArea {
+                       anchors.fill: parent
+                       onPressed: player.next()
+                    }
                 }
 
                 Item {

playback/player/qt/qgstplayer.cpp

@@ -354,7 +354,8 @@ Player::Player(QObject *parent, VideoRenderer *renderer)
         "swapped-signal::video-dimensions-changed", G_CALLBACK (Player::onVideoDimensionsChanged), this,
         "swapped-signal::volume-changed", G_CALLBACK (Player::onVolumeChanged), this,
         "swapped-signal::mute-changed", G_CALLBACK (Player::onMuteChanged), this,
-        "swapped-signal::media-info-updated", G_CALLBACK (Player::onMediaInfoUpdated), this, NULL);
+        "swapped-signal::media-info-updated", G_CALLBACK (Player::onMediaInfoUpdated), this,
+        "swapped-signal::end-of-stream", G_CALLBACK (Player::onEndOfStreamReached), this, NULL);
 
     mediaInfo_ = new MediaInfo(this);
     gst_player_set_subtitle_track_enabled(player_, false);
@@ -444,6 +445,63 @@ Player::onMediaInfoUpdated(Player *player, GstPlayerMediaInfo *media_info)
     emit player->mediaInfoChanged();
 }
 
+void Player::onEndOfStreamReached(Player *player)
+{
+    Q_ASSERT(player != 0);
+
+    emit player->endOfStream();
+}
+
+void Player::setUri(QUrl url)
+{
+    Q_ASSERT(player_ != 0);
+    QByteArray uri = url.toString().toLocal8Bit();
+
+    gst_player_set_uri(player_, uri.data());
+
+    autoPlay_ ? play() : pause();
+
+    emit sourceChanged(url);
+}
+
+QList<QUrl> Player::playlist() const
+{
+    return playlist_;
+}
+
+void Player::setPlaylist(const QList<QUrl> &playlist)
+{
+    if (!playlist_.isEmpty()) {
+        playlist_.erase(playlist_.begin(), playlist_.end());
+    }
+
+    playlist_ = playlist;
+
+    iter_ = playlist_.begin();
+    setUri(*iter_);
+}
+
+void Player::next()
+{
+    if (playlist_.isEmpty())
+        return;
+
+    if (iter_ == playlist_.end())
+        return;
+
+    setUri(*++iter_);
+}
+
+void Player::previous()
+{
+    if (playlist_.isEmpty())
+        return;
+
+    if (iter_ == playlist_.begin())
+        return;
+
+    setUri(*--iter_);
+}
 
 bool Player::autoPlay() const
 {
@@ -554,9 +612,13 @@ void Player::seek(qint64 position)
 void Player::setSource(QUrl const& url)
 {
     Q_ASSERT(player_ != 0);
-    QByteArray uri = url.toString().toLocal8Bit();
 
-    gst_player_set_uri(player_, uri.data());
+    // discard playlist
+    if (!playlist_.isEmpty()) {
+        playlist_.erase(playlist_.begin(), playlist_.end());
+    }
+
+    setUri(url);
 
     emit sourceChanged(url);
 }

playback/player/qt/qgstplayer.h

@@ -25,7 +25,8 @@
 #include <QUrl>
 #include <QSize>
 //#include <QtGui/qwindowdefs.h>
-#include <QtQml/QQmlPropertyMap>
+#include <QVariant>
+#include <QList>
 #include <gst/player/player.h>
 
 namespace QGstPlayer {
@@ -58,6 +59,7 @@ class Player : public QObject
     Q_PROPERTY(bool subtitleEnabled READ isSubtitleEnabled WRITE setSubtitleEnabled
                NOTIFY subtitleEnabledChanged)
     Q_PROPERTY(bool autoPlay READ autoPlay WRITE setAutoPlay)
+    Q_PROPERTY(QList<QUrl> playlist READ playlist WRITE setPlaylist)
 
     Q_ENUMS(State)
 
@@ -91,10 +93,12 @@ public:
     bool isSubtitleEnabled() const;
     quint32 positionUpdateInterval() const;
     bool autoPlay() const;
+    QList<QUrl> playlist() const;
 
 signals:
     void stateChanged(State new_state);
     void bufferingChanged(int percent);
+    void endOfStream();
     void positionUpdated(qint64 new_position);
     void durationChanged(qint64 duration);
     void resolutionChanged(QSize resolution);
@@ -119,6 +123,9 @@ public slots:
     void setCurrentSubtitle(QVariant track);
     void setSubtitleEnabled(bool enabled);
     void setPositionUpdateInterval(quint32 interval);
+    void setPlaylist(const QList<QUrl> &playlist);
+    void next();
+    void previous();
     void setAutoPlay(bool auto_play);
 
 private:
@@ -131,6 +138,9 @@ private:
     static void onVolumeChanged(Player *);
     static void onMuteChanged(Player *);
     static void onMediaInfoUpdated(Player *, GstPlayerMediaInfo *media_info);
+    static void onEndOfStreamReached(Player *);
+
+    void setUri(QUrl url);
 
     GstPlayer *player_;
     State state_;
@@ -139,6 +149,8 @@ private:
     bool videoAvailable_;
     bool subtitleEnabled_;
     bool autoPlay_;
+    QList<QUrl> playlist_;
+    QList<QUrl>::iterator iter_;
 };
 
 class VideoRenderer