Add Windows Media Foundation backend for QMediaPlayer

Task-number:QTMOBILITY-1606
Reviewed-by: Michael Goddard
(cherry picked from commit bdf3a9b39661cfb836245139d02e95e854646a7e)
(cherry picked from commit 8d2370953eb32bf44a037244e0d9f9b484875f7a)

Change-Id: I07790b8c540a04e4e19a3d018a4884a773e980bf
Reviewed-on: http://codereview.qt.nokia.com/2086
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Ling Hu <ling.hu@nokia.com>

1 files changed, 162 insertions, 0 deletions

diff --git a/src/plugins/wmf/player/mfaudioendpointcontrol.cpp b/src/plugins/wmf/player/mfaudioendpointcontrol.cpp
new file mode 100644
index 000000000..dac5a0abf
--- /dev/null
+++ b/src/plugins/wmf/player/mfaudioendpointcontrol.cpp
@@ -0,0 +1,162 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 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 "QtCore/qdebug.h"
+#include "mfaudioendpointcontrol.h"
+
+MFAudioEndpointControl::MFAudioEndpointControl(QObject *parent)
+    : QAudioEndpointSelector(parent)
+    , m_currentActivate(0)
+{
+    updateEndpoints();
+    setActiveEndpoint(m_defaultEndpoint);
+}
+
+MFAudioEndpointControl::~MFAudioEndpointControl()
+{
+    foreach (LPWSTR wstrID, m_devices)
+         CoTaskMemFree(wstrID);
+
+    if (m_currentActivate)
+        m_currentActivate->Release();
+}
+
+QList<QString> MFAudioEndpointControl::availableEndpoints() const
+{
+    return m_devices.keys();
+}
+
+QString MFAudioEndpointControl::endpointDescription(const QString &name) const
+{
+    return name.section(QLatin1Char('\\'), -1);
+}
+
+QString MFAudioEndpointControl::defaultEndpoint() const
+{
+    return m_defaultEndpoint;
+}
+
+QString MFAudioEndpointControl::activeEndpoint() const
+{
+    return m_activeEndpoint;
+}
+
+void MFAudioEndpointControl::setActiveEndpoint(const QString &name)
+{
+    if (m_activeEndpoint == name)
+        return;
+    QMap<QString, LPWSTR>::iterator it = m_devices.find(name);
+    if (it == m_devices.end())
+        return;
+
+    LPWSTR wstrID = *it;
+    IMFActivate *activate = NULL;
+    HRESULT hr = MFCreateAudioRendererActivate(&activate);
+    if (FAILED(hr)) {
+        qWarning() << "Failed to create audio renderer activate";
+        return;
+    }
+
+    if (wstrID) {
+        hr = activate->SetString(MF_AUDIO_RENDERER_ATTRIBUTE_ENDPOINT_ID, wstrID);
+    } else {
+        //This is the default one that has been inserted in updateEndpoints(),
+        //so give the activate a hint that we want to use the device for multimedia playback
+        //then the media foundation will choose an apropriate one.
+
+        //from MSDN:
+        //The ERole enumeration defines constants that indicate the role that the system has assigned to an audio endpoint device.
+        //eMultimedia: Music, movies, narration, and live music recording.
+        hr = activate->SetUINT32(MF_AUDIO_RENDERER_ATTRIBUTE_ENDPOINT_ROLE, eMultimedia);
+    }
+
+    if (FAILED(hr)) {
+        qWarning() << "Failed to set attribute for audio device" << name;
+        return;
+    }
+
+    if (m_currentActivate)
+        m_currentActivate->Release();
+    m_currentActivate = activate;
+    m_activeEndpoint = name;
+}
+
+IMFActivate*  MFAudioEndpointControl::currentActivate() const
+{
+    return m_currentActivate;
+}
+
+void MFAudioEndpointControl::updateEndpoints()
+{
+    m_defaultEndpoint = QString::fromLatin1("Default");
+    m_devices.insert(m_defaultEndpoint, NULL);
+
+    IMMDeviceEnumerator *pEnum = NULL;
+    HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator),
+                          NULL, CLSCTX_ALL,
+                          __uuidof(IMMDeviceEnumerator),
+                         (void**)&pEnum);
+    if (SUCCEEDED(hr)) {
+        IMMDeviceCollection *pDevices = NULL;
+        hr = pEnum->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &pDevices);
+        if (SUCCEEDED(hr)) {
+            UINT count;
+            hr = pDevices->GetCount(&count);
+            if (SUCCEEDED(hr)) {
+                for (UINT i = 0; i < count; ++i) {
+                    IMMDevice *pDevice = NULL;
+                    hr = pDevices->Item(i, &pDevice);
+                    if (SUCCEEDED(hr)) {
+                        LPWSTR wstrID = NULL;
+                        hr = pDevice->GetId(&wstrID);
+                        if (SUCCEEDED(hr)) {
+                            QString deviceId = QString::fromWCharArray(wstrID);
+                            m_devices.insert(deviceId, wstrID);
+                        }
+                        pDevice->Release();
+                    }
+                }
+            }
+            pDevices->Release();
+        }
+        pEnum->Release();
+    }
+}