Blackberry: Implement QVideoRendererControl for QMediaPlayer backend

If the application is not supposed to play back DRM secured media,
we grab the pixel data from the native mmrenderer window now
and make them available to the QAbstractVideoSurface of the
QVideoRendererControl. This allows the usage of all transformations
on video output inside QtQuick.

Change-Id: I73d05404b1ac9c5f74a234d9393b981a6fbcb317
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>

src/plugins/blackberry/mediaplayer/bbplayervideorenderercontrol.cpp

@@ -0,0 +1,152 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Research In Motion
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "bbplayervideorenderercontrol.h"
+
+#include "windowgrabber.h"
+
+#include <QCoreApplication>
+#include <QDebug>
+#include <QVideoSurfaceFormat>
+
+#include <mm/renderer.h>
+
+QT_BEGIN_NAMESPACE
+
+static int winIdCounter = 0;
+
+BbPlayerVideoRendererControl::BbPlayerVideoRendererControl(QObject *parent)
+    : QVideoRendererControl(parent)
+    , m_windowGrabber(new WindowGrabber(this))
+    , m_context(0)
+    , m_videoId(-1)
+{
+    connect(m_windowGrabber, SIGNAL(frameGrabbed(QImage)), SLOT(frameGrabbed(QImage)));
+}
+
+BbPlayerVideoRendererControl::~BbPlayerVideoRendererControl()
+{
+    detachDisplay();
+}
+
+QAbstractVideoSurface *BbPlayerVideoRendererControl::surface() const
+{
+    return m_surface;
+}
+
+void BbPlayerVideoRendererControl::setSurface(QAbstractVideoSurface *surface)
+{
+    m_surface = QPointer<QAbstractVideoSurface>(surface);
+}
+
+void BbPlayerVideoRendererControl::attachDisplay(mmr_context_t *context)
+{
+    if (m_videoId != -1) {
+        qWarning() << "BbPlayerVideoRendererControl: Video output already attached!";
+        return;
+    }
+
+    if (!context) {
+        qWarning() << "BbPlayerVideoRendererControl: No media player context!";
+        return;
+    }
+
+    const QByteArray windowGroupId = m_windowGrabber->windowGroupId();
+    if (windowGroupId.isEmpty()) {
+        qWarning() << "BbPlayerVideoRendererControl: Unable to find window group";
+        return;
+    }
+
+    const QString windowName = QStringLiteral("BbPlayerVideoRendererControl_%1_%2")
+                                             .arg(winIdCounter++)
+                                             .arg(QCoreApplication::applicationPid());
+
+    m_windowGrabber->setWindowId(windowName.toLatin1());
+
+    // Start with an invisible window, because we just want to grab the frames from it.
+    const QString videoDeviceUrl = QStringLiteral("screen:?winid=%1&wingrp=%2&initflags=invisible&nodstviewport=1")
+                                                 .arg(windowName)
+                                                 .arg(QString::fromLatin1(windowGroupId));
+
+    m_videoId = mmr_output_attach(context, videoDeviceUrl.toLatin1(), "video");
+    if (m_videoId == -1) {
+        qWarning() << "mmr_output_attach() for video failed";
+        return;
+    }
+
+    m_context = context;
+}
+
+void BbPlayerVideoRendererControl::detachDisplay()
+{
+    m_windowGrabber->stop();
+
+    if (m_surface)
+        m_surface->stop();
+
+    if (m_context && m_videoId != -1)
+        mmr_output_detach(m_context, m_videoId);
+
+    m_context = 0;
+    m_videoId = -1;
+}
+
+void BbPlayerVideoRendererControl::pause()
+{
+    m_windowGrabber->pause();
+}
+
+void BbPlayerVideoRendererControl::resume()
+{
+    m_windowGrabber->resume();
+}
+
+void BbPlayerVideoRendererControl::frameGrabbed(const QImage &frame)
+{
+    if (m_surface) {
+        if (!m_surface->isActive())
+            m_surface->start(QVideoSurfaceFormat(frame.size(), QVideoFrame::Format_ARGB32));
+
+        m_surface->present(frame.copy());
+    }
+}
+
+QT_END_NAMESPACE