Multimedia; Add GStreamer backend

1 files changed, 322 insertions, 0 deletions

diff --git a/src/plugins/mediaservices/gstreamer/qgstreamervideowidget.cpp b/src/plugins/mediaservices/gstreamer/qgstreamervideowidget.cpp
new file mode 100644
index 0000000..7b2ec14
--- /dev/null
+++ b/src/plugins/mediaservices/gstreamer/qgstreamervideowidget.cpp
@@ -0,0 +1,322 @@
+/****************************************************************************
+**
+** 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 Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "qgstreamervideowidget.h"
+
+#include <QtCore/qcoreevent.h>
+#include <QtCore/qdebug.h>
+#include <QtGui/qapplication.h>
+#include <QtGui/qpainter.h>
+
+#include <X11/Xlib.h>
+#include <gst/gst.h>
+#include <gst/interfaces/xoverlay.h>
+#include <gst/interfaces/propertyprobe.h>
+
+class QGstreamerVideoWidget : public QWidget
+{
+public:
+    QGstreamerVideoWidget(QWidget *parent = 0)
+        :QWidget(parent)
+    {
+        setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+        QPalette palette;
+        palette.setColor(QPalette::Background, Qt::black);
+        setPalette(palette);
+    }
+
+    virtual ~QGstreamerVideoWidget() {}
+
+    QSize sizeHint() const
+    {
+        return m_nativeSize;
+    }
+
+    void setNativeSize( const QSize &size)
+    {
+        if (size != m_nativeSize) {
+            m_nativeSize = size;
+            if (size.isEmpty())
+                setMinimumSize(0,0);
+            else
+                setMinimumSize(160,120);
+
+            updateGeometry();
+        }
+    }
+
+protected:
+    void paintEvent(QPaintEvent *)
+    {
+        QPainter painter(this);
+        painter.fillRect(rect(), palette().background());
+    }
+
+    QSize m_nativeSize;
+};
+
+QGstreamerVideoWidgetControl::QGstreamerVideoWidgetControl(QObject *parent)
+    : QVideoWidgetControl(parent)
+    , m_videoSink(0)
+    , m_widget(new QGstreamerVideoWidget)
+    , m_fullScreen(false)
+{
+    m_widget->installEventFilter(this);
+    m_windowId = m_widget->winId();
+
+    m_videoSink = gst_element_factory_make ("xvimagesink", NULL);
+    if (m_videoSink) {
+        // Check if the xv sink is usable
+        if (gst_element_set_state(m_videoSink, GST_STATE_READY) != GST_STATE_CHANGE_SUCCESS) {
+            gst_object_unref(GST_OBJECT(m_videoSink));
+            m_videoSink = 0;
+        } else {
+            gst_element_set_state(m_videoSink, GST_STATE_NULL);
+
+            g_object_set(G_OBJECT(m_videoSink), "force-aspect-ratio", 1, (const char*)NULL);
+        }
+    }
+
+    if (!m_videoSink)
+        m_videoSink = gst_element_factory_make ("ximagesink", NULL);
+
+    gst_object_ref (GST_OBJECT (m_videoSink)); //Take ownership
+    gst_object_sink (GST_OBJECT (m_videoSink));
+}
+
+QGstreamerVideoWidgetControl::~QGstreamerVideoWidgetControl()
+{
+    if (m_videoSink)
+        gst_object_unref(GST_OBJECT(m_videoSink));
+
+    delete m_widget;
+}
+
+GstElement *QGstreamerVideoWidgetControl::videoSink()
+{
+    return m_videoSink;
+}
+
+bool QGstreamerVideoWidgetControl::eventFilter(QObject *object, QEvent *e)
+{
+    if (object == m_widget) {
+        if (e->type() == QEvent::ParentChange || e->type() == QEvent::Show) {
+            WId newWId = m_widget->winId();
+            if (newWId != m_windowId) {
+                m_windowId = newWId;
+                // Even if we have created a winId at this point, other X applications
+                // need to be aware of it.
+                QApplication::syncX();
+                setOverlay();
+            }
+        }
+
+        if (e->type() == QEvent::Show) {
+            // Setting these values ensures smooth resizing since it
+            // will prevent the system from clearing the background
+            m_widget->setAttribute(Qt::WA_NoSystemBackground, true);
+            m_widget->setAttribute(Qt::WA_PaintOnScreen, true);
+        } else if (e->type() == QEvent::Resize) {
+            // This is a workaround for missing background repaints
+            // when reducing window size
+            windowExposed();
+        }
+    }
+
+    return false;
+}
+
+void QGstreamerVideoWidgetControl::precessNewStream()
+{
+    setOverlay();
+    QMetaObject::invokeMethod(this, "updateNativeVideoSize", Qt::QueuedConnection);
+}
+
+void QGstreamerVideoWidgetControl::setOverlay()
+{
+    if (m_videoSink && GST_IS_X_OVERLAY(m_videoSink)) {
+        gst_x_overlay_set_xwindow_id(GST_X_OVERLAY(m_videoSink), m_windowId);
+    }
+}
+
+void QGstreamerVideoWidgetControl::updateNativeVideoSize()
+{
+    if (m_videoSink) {
+        //find video native size to update video widget size hint
+        GstPad *pad = gst_element_get_static_pad(m_videoSink,"sink");
+        GstCaps *caps = gst_pad_get_negotiated_caps(pad);
+
+        if (caps) {
+            GstStructure *str;
+            gint width, height;
+
+            if ((str = gst_caps_get_structure (caps, 0))) {
+                if (gst_structure_get_int (str, "width", &width) && gst_structure_get_int (str, "height", &height)) {
+                    gint aspectNum = 0;
+                    gint aspectDenum = 0;
+                    if (gst_structure_get_fraction(str, "pixel-aspect-ratio", &aspectNum, &aspectDenum)) {
+                        if (aspectDenum > 0)
+                            width = width*aspectNum/aspectDenum;
+                    }
+                    m_widget->setNativeSize(QSize(width, height));
+                }
+            }
+            gst_caps_unref(caps);
+        }
+    } else {
+        m_widget->setNativeSize(QSize());
+    }
+}
+
+
+void QGstreamerVideoWidgetControl::windowExposed()
+{
+    if (m_videoSink && GST_IS_X_OVERLAY(m_videoSink))
+        gst_x_overlay_expose(GST_X_OVERLAY(m_videoSink));
+}
+
+QWidget *QGstreamerVideoWidgetControl::videoWidget()
+{
+    return m_widget;
+}
+
+QVideoWidget::AspectRatioMode QGstreamerVideoWidgetControl::aspectRatioMode() const
+{
+    return m_aspectRatioMode;
+}
+
+void QGstreamerVideoWidgetControl::setAspectRatioMode(QVideoWidget::AspectRatioMode mode)
+{
+    if (m_videoSink) {
+        g_object_set(G_OBJECT(m_videoSink),
+                     "force-aspect-ratio",
+                     (mode == QVideoWidget::KeepAspectRatio),
+                     (const char*)NULL);
+    }
+
+    m_aspectRatioMode = mode;
+}
+
+bool QGstreamerVideoWidgetControl::isFullScreen() const
+{
+    return m_fullScreen;
+}
+
+void QGstreamerVideoWidgetControl::setFullScreen(bool fullScreen)
+{
+    emit fullScreenChanged(m_fullScreen =  fullScreen);
+}
+
+int QGstreamerVideoWidgetControl::brightness() const
+{
+    int brightness = 0;
+
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "brightness"))
+        g_object_get(G_OBJECT(m_videoSink), "brightness", &brightness, NULL);
+
+    return brightness / 10;
+}
+
+void QGstreamerVideoWidgetControl::setBrightness(int brightness)
+{
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "brightness")) {
+        g_object_set(G_OBJECT(m_videoSink), "brightness", brightness * 10, NULL);
+
+        emit brightnessChanged(brightness);
+    }
+}
+
+int QGstreamerVideoWidgetControl::contrast() const
+{
+    int contrast = 0;
+
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "contrast"))
+    g_object_get(G_OBJECT(m_videoSink), "contrast", &contrast, NULL);
+
+    return contrast / 10;
+}
+
+void QGstreamerVideoWidgetControl::setContrast(int contrast)
+{
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "contrast")) {
+        g_object_set(G_OBJECT(m_videoSink), "contrast", contrast * 10, NULL);
+
+        emit contrastChanged(contrast);
+    }
+}
+
+int QGstreamerVideoWidgetControl::hue() const
+{
+    int hue = 0;
+
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "hue"))
+        g_object_get(G_OBJECT(m_videoSink), "hue", &hue, NULL);
+
+    return hue / 10;
+}
+
+void QGstreamerVideoWidgetControl::setHue(int hue)
+{
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "hue")) {
+        g_object_set(G_OBJECT(m_videoSink), "hue", hue * 10, NULL);
+
+        emit hueChanged(hue);
+    }
+}
+
+int QGstreamerVideoWidgetControl::saturation() const
+{
+    int saturation = 0;
+
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "saturation"))
+        g_object_get(G_OBJECT(m_videoSink), "saturation", &saturation, NULL);
+
+    return saturation / 10;
+}
+
+void QGstreamerVideoWidgetControl::setSaturation(int saturation)
+{
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(m_videoSink), "saturation")) {
+        g_object_set(G_OBJECT(m_videoSink), "saturation", saturation * 10, NULL);
+
+        emit saturationChanged(saturation);
+    }
+}