Merge branch '4.6' of scm.dev.nokia.troll.no:qt/qt-s60-public into 4.6-integration

* '4.6' of scm.dev.nokia.troll.no:qt/qt-s60-public: (22 commits)
  use egl properties when creating surfaces on symbian
  work around the current include file structure on Symbian^3
  Get rid of the dependency on the Symbian app layer
  Fix incorrect license headers
  Fix incorrect license headers
  Supressed Icon sizes on QPushButton in QS60Style
  Fixed libstdcpp.dll version autodetection for Symbian
  Fixed linkage failure when building qmake on Unix platforms
  Factored epocRoot implementation out of qmake
  Factored readRegistryKey implementation out of qmake
  ColorDialog is always shown as stripped-down version (for QVGA)
  Virtual keyboard can't be closed anymore after tapping the text area
  Revert "Factored readRegistryKey implementation out of qmake"
  Revert "Factored epocRoot implementation out of qmake"
  Pass QAudioDeviceInfo when creating audio input/output in examples
  Symbian backend for QtMultimedia audio
  Modified configure to detect SDK support for Symbian audio backend
  Added implementation of epocRoot() function to configure
  Removed duplicated implementation of readRegistryKeys from configure
  Factored epocRoot implementation out of qmake
  ...

22 files changed, 2766 insertions, 20 deletions

diff --git a/src/corelib/xml/qxmlstream_p.h b/src/corelib/xml/qxmlstream_p.h
index 6b911d2..ac421cf 100644
--- a/src/corelib/xml/qxmlstream_p.h
+++ b/src/corelib/xml/qxmlstream_p.h
@@ -54,7 +54,7 @@
 #ifndef QXMLSTREAM_P_H
 #define QXMLSTREAM_P_H
 
-#if defined(Q_OS_VXWORKS) && defined(ERROR)
+#if defined(ERROR)
 #  undef ERROR
 #endif
 
diff --git a/src/gui/dialogs/qcolordialog.cpp b/src/gui/dialogs/qcolordialog.cpp
index 83ecc30..e6abf7f 100644
--- a/src/gui/dialogs/qcolordialog.cpp
+++ b/src/gui/dialogs/qcolordialog.cpp
@@ -1078,8 +1078,7 @@ QColorShower::QColorShower(QColorDialog *parent)
 
 #ifdef QT_SMALL_COLORDIALOG
 #  ifdef Q_WS_S60
-    QS60Data s60Data = QS60Data();
-    const bool nonTouchUI = !s60Data.hasTouchscreen;
+    const bool nonTouchUI = !S60->hasTouchscreen;
 #  elif defined Q_WS_MAEMO_5
     const bool nonTouchUI = false;
 #  endif
@@ -1506,8 +1505,7 @@ void QColorDialogPrivate::init(const QColor &initial)
 
 #if defined(QT_SMALL_COLORDIALOG)
 #  if defined(Q_WS_S60)
-    QS60Data s60Data = QS60Data();
-    const bool nonTouchUI = !s60Data.hasTouchscreen;
+    const bool nonTouchUI = !S60->hasTouchscreen;
 #  elif defined(Q_WS_MAEMO_5)
     const bool nonTouchUI = false;
 #  endif
diff --git a/src/gui/egl/qegl_symbian.cpp b/src/gui/egl/qegl_symbian.cpp
index b1c9408..5a010cd 100644
--- a/src/gui/egl/qegl_symbian.cpp
+++ b/src/gui/egl/qegl_symbian.cpp
@@ -78,9 +78,9 @@ EGLSurface QEglContext::createSurface(QPaintDevice *device, const QEglProperties
         props = 0;
     EGLSurface surf;
     if (devType == QInternal::Widget)
-        surf = eglCreateWindowSurface(dpy, cfg, windowDrawable, 0);
+        surf = eglCreateWindowSurface(dpy, cfg, windowDrawable, props);
     else
-        surf = eglCreatePixmapSurface(dpy, cfg, pixmapDrawable, 0);
+        surf = eglCreatePixmapSurface(dpy, cfg, pixmapDrawable, props);
     if (surf == EGL_NO_SURFACE)
         qWarning("QEglContext::createSurface(): Unable to create EGL surface, error = 0x%x", eglGetError());
     return surf;
diff --git a/src/gui/inputmethod/qcoefepinputcontext_s60.cpp b/src/gui/inputmethod/qcoefepinputcontext_s60.cpp
index 2b91711..1ac8ace 100644
--- a/src/gui/inputmethod/qcoefepinputcontext_s60.cpp
+++ b/src/gui/inputmethod/qcoefepinputcontext_s60.cpp
@@ -113,7 +113,7 @@ void QCoeFepInputContext::update()
     updateHints(false);
 
     // For pre-5.0 SDKs, we don't do text updates on S60 side.
-    if (QSysInfo::s60Version() != QSysInfo::SV_S60_5_0) {
+    if (QSysInfo::s60Version() < QSysInfo::SV_S60_5_0) {
         return;
     }
 
@@ -740,6 +740,9 @@ void QCoeFepInputContext::GetScreenCoordinatesForFepL(TPoint& aLeftSideOfBaseLin
 void QCoeFepInputContext::DoCommitFepInlineEditL()
 {
     commitCurrentString(false);
+    if (QSysInfo::s60Version() > QSysInfo::SV_S60_5_0)
+        ReportAknEdStateEvent(QT_EAknCursorPositionChanged);
+
 }
 
 void QCoeFepInputContext::commitCurrentString(bool cancelFepTransaction)
diff --git a/src/gui/styles/qs60style.cpp b/src/gui/styles/qs60style.cpp
index ea7399f..565cc2c 100644
--- a/src/gui/styles/qs60style.cpp
+++ b/src/gui/styles/qs60style.cpp
@@ -120,6 +120,8 @@ QPixmap *QS60StylePrivate::m_background = 0;
 // theme palette
 QPalette *QS60StylePrivate::m_themePalette = 0;
 
+qint64 QS60StylePrivate::m_webPaletteKey = 0;
+
 const struct QS60StylePrivate::frameElementCenter QS60StylePrivate::m_frameElementsData[] = {
     {SE_ButtonNormal,           QS60StyleEnums::SP_QsnFrButtonTbCenter},
     {SE_ButtonPressed,          QS60StyleEnums::SP_QsnFrButtonTbCenterPressed},
@@ -807,8 +809,12 @@ void QS60StylePrivate::setThemePaletteHash(QPalette *palette) const
     QPalette webPalette = *palette;
     webPalette.setColor(QPalette::WindowText, Qt::black);
     webPalette.setColor(QPalette::Text, Qt::black);
+    webPalette.setBrush(QPalette::Base, Qt::white);
+
     QApplication::setPalette(webPalette, "QWebView");
     QApplication::setPalette(webPalette, "QGraphicsWebView");
+
+    m_webPaletteKey = webPalette.cacheKey();
 }
 
 QSize QS60StylePrivate::partSize(QS60StyleEnums::SkinParts part, SkinElementFlags flags)
@@ -896,8 +902,11 @@ QSize QS60StylePrivate::partSize(QS60StyleEnums::SkinParts part, SkinElementFlag
     return result;
 }
 
-bool QS60StylePrivate::canDrawThemeBackground(const QBrush &backgroundBrush)
+bool QS60StylePrivate::canDrawThemeBackground(const QBrush &backgroundBrush, const QWidget *widget)
 {
+    // Always return true for web pages.
+    if (widget && m_webPaletteKey == QApplication::palette(widget).cacheKey())
+        return true;
     //If brush is not changed from style's default values, draw theme graphics.
     return (backgroundBrush.color() == Qt::transparent ||
             backgroundBrush.style() == Qt::NoBrush) ? true : false;
@@ -1901,7 +1910,7 @@ void QS60Style::drawControl(ControlElement element, const QStyleOption *option,
     case CE_ShapedFrame:
         if (const QTextEdit *textEdit = qobject_cast<const QTextEdit *>(widget)) {
             const QStyleOptionFrame *frame = qstyleoption_cast<const QStyleOptionFrame *>(option);
-            if (QS60StylePrivate::canDrawThemeBackground(frame->palette.base()))
+            if (QS60StylePrivate::canDrawThemeBackground(frame->palette.base(), widget))
                 QS60StylePrivate::drawSkinElement(QS60StylePrivate::SE_Editor, painter, option->rect, flags);
             else
                 QCommonStyle::drawControl(element, option, painter, widget);
@@ -2013,7 +2022,7 @@ void QS60Style::drawPrimitive(PrimitiveElement element, const QStyleOption *opti
             if (widget && qobject_cast<const QComboBox *>(widget->parentWidget()))
                 break;
 #endif
-            if (QS60StylePrivate::canDrawThemeBackground(option->palette.base()))
+            if (QS60StylePrivate::canDrawThemeBackground(option->palette.base(), widget))
                 QS60StylePrivate::drawSkinElement(QS60StylePrivate::SE_FrameLineEdit, painter, option->rect, flags);
             else
                 commonStyleDraws = true;
@@ -2093,7 +2102,7 @@ void QS60Style::drawPrimitive(PrimitiveElement element, const QStyleOption *opti
     case PE_PanelButtonTool:
     case PE_PanelButtonBevel:
     case PE_FrameButtonBevel:
-        if (QS60StylePrivate::canDrawThemeBackground(option->palette.base())) {
+        if (QS60StylePrivate::canDrawThemeBackground(option->palette.base(), widget)) {
             const bool isPressed = option->state & State_Sunken;
             const QS60StylePrivate::SkinElements skinElement =
                 isPressed ? QS60StylePrivate::SE_ButtonPressed : QS60StylePrivate::SE_ButtonNormal;
@@ -2125,7 +2134,7 @@ void QS60Style::drawPrimitive(PrimitiveElement element, const QStyleOption *opti
     case PE_IndicatorSpinDown:
     case PE_IndicatorSpinUp:
         if (const QStyleOptionSpinBox *spinBox = qstyleoption_cast<const QStyleOptionSpinBox *>(option)) {
-            if (QS60StylePrivate::canDrawThemeBackground(spinBox->palette.base())) {
+            if (QS60StylePrivate::canDrawThemeBackground(spinBox->palette.base(), widget)) {
                 QStyleOptionSpinBox optionSpinBox = *spinBox;
                 const QS60StyleEnums::SkinParts part = (element == PE_IndicatorSpinUp) ?
                     QS60StyleEnums::SP_QgnGrafScrollArrowUp :
@@ -2140,7 +2149,7 @@ void QS60Style::drawPrimitive(PrimitiveElement element, const QStyleOption *opti
 #endif //QT_NO_SPINBOX
 #ifndef QT_NO_COMBOBOX
         if (const QStyleOptionFrame *cmb = qstyleoption_cast<const QStyleOptionFrame *>(option)) {
-            if (QS60StylePrivate::canDrawThemeBackground( option->palette.base())) {
+            if (QS60StylePrivate::canDrawThemeBackground( option->palette.base(), widget)) {
                 // We want to draw down arrow here for comboboxes as well.
                 QStyleOptionFrame optionsComboBox = *cmb;
                 const QS60StyleEnums::SkinParts part = QS60StyleEnums::SP_QgnGrafScrollArrowDown;
@@ -2179,7 +2188,7 @@ void QS60Style::drawPrimitive(PrimitiveElement element, const QStyleOption *opti
 #endif //QT_NO_MENU
             ) {
             //Need extra check since dialogs have their own theme background
-            if (QS60StylePrivate::canDrawThemeBackground(option->palette.base()) &&
+            if (QS60StylePrivate::canDrawThemeBackground(option->palette.base(), widget) &&
                 option->palette.window().texture().cacheKey() ==
                     QS60StylePrivate::m_themePalette->window().texture().cacheKey())
                 QS60StylePrivate::drawSkinElement(QS60StylePrivate::SE_OptionsMenu, painter, option->rect, flags);
@@ -2387,10 +2396,20 @@ QSize QS60Style::sizeFromContents(ContentsType ct, const QStyleOption *opt,
         case CT_PushButton:
             sz = QCommonStyle::sizeFromContents( ct, opt, csz, widget);
             //FIXME properly - style should calculate the location of border frame-part
-            sz += QSize(2 * pixelMetric(PM_ButtonMargin), 2 * pixelMetric(PM_ButtonMargin));
-            if (const QAbstractButton *buttonWidget = (qobject_cast<const QAbstractButton *>(widget)))
+            if (const QAbstractButton *buttonWidget = (qobject_cast<const QAbstractButton *>(widget)))  {
                 if (buttonWidget->isCheckable())
                     sz += QSize(pixelMetric(PM_IndicatorWidth) + pixelMetric(PM_CheckBoxLabelSpacing), 0);
+                const int iconHeight = (!buttonWidget->icon().isNull()) ? buttonWidget->iconSize().height() : 0;
+                const int textHeight = (buttonWidget->text().length() > 0) ?
+                    buttonWidget->fontMetrics().size(Qt::TextSingleLine, buttonWidget->text()).height() : 0;
+                const int decoratorHeight = (buttonWidget->isCheckable()) ? pixelMetric(PM_IndicatorHeight) : 0;
+
+                const int contentHeight =
+                        qMax(qMax(iconHeight, decoratorHeight) + pixelMetric(PM_ButtonMargin),
+                             textHeight + 2*pixelMetric(PM_ButtonMargin));
+                sz.setHeight(contentHeight);
+                sz += QSize(2 * pixelMetric(PM_ButtonMargin), 0);
+            }
             break;
         case CT_LineEdit:
             if (const QStyleOptionFrame *f = qstyleoption_cast<const QStyleOptionFrame *>(opt))
diff --git a/src/gui/styles/qs60style_p.h b/src/gui/styles/qs60style_p.h
index ea30b81..16d82e7 100644
--- a/src/gui/styles/qs60style_p.h
+++ b/src/gui/styles/qs60style_p.h
@@ -542,7 +542,7 @@ public:
 
     //Checks that the current brush is transparent or has BrushStyle NoBrush,
     //so that theme graphic background can be drawn.
-    static bool canDrawThemeBackground(const QBrush &backgroundBrush);
+    static bool canDrawThemeBackground(const QBrush &backgroundBrush, const QWidget *widget);
 
     static int currentAnimationFrame(QS60StyleEnums::SkinParts part);
 #ifdef Q_WS_S60
@@ -596,6 +596,7 @@ private:
     QPalette m_originalPalette;
 
     QPointer<QFocusFrame> m_focusFrame;
+    static qint64 m_webPaletteKey;
 
 #ifdef Q_WS_S60
     //list of progress bars having animation running
diff --git a/src/gui/util/qdesktopservices_s60.cpp b/src/gui/util/qdesktopservices_s60.cpp
index 319c4b0..adc4fc1 100644
--- a/src/gui/util/qdesktopservices_s60.cpp
+++ b/src/gui/util/qdesktopservices_s60.cpp
@@ -48,7 +48,6 @@
 #include <qurl.h>
 #include <private/qcore_symbian_p.h>
 
-#include <miutset.h>                // KUidMsgTypeSMTP
 #include <txtrich.h>                // CRichText
 #include <f32file.h>                // TDriveUnit etc
 #include <eikenv.h>                 // CEikonEnv
@@ -57,6 +56,9 @@
 #include <rsendas.h>                // RSendAs
 #include <rsendasmessage.h>         // RSendAsMessage
 
+// copied from miutset.h, so we don't get a dependency into the app layer
+const TUid KUidMsgTypeSMTP			= {0x10001028};	// 268439592
+
 #ifdef Q_WS_S60
 #  include <pathinfo.h>             // PathInfo
 #  ifdef USE_DOCUMENTHANDLER
diff --git a/src/plugins/audio/audio.pro b/src/plugins/audio/audio.pro
index e93b369..5f75a8d 100644
--- a/src/plugins/audio/audio.pro
+++ b/src/plugins/audio/audio.pro
@@ -1,3 +1,9 @@
 TEMPLATE = subdirs
+SUBDIRS =
+
+contains(QT_CONFIG, audio-backend) {
+    symbian {
+        SUBDIRS += symbian
+    }
+}
 
-#SUBDIRS += ossaudio
diff --git a/src/plugins/audio/symbian/main.cpp b/src/plugins/audio/symbian/main.cpp
new file mode 100644
index 0000000..536a8ec
--- /dev/null
+++ b/src/plugins/audio/symbian/main.cpp
@@ -0,0 +1,121 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 <QtMultimedia/qaudioengineplugin.h>
+#include <QtMultimedia/qaudioengine.h>
+
+#include <qstringlist.h>
+#include <qiodevice.h>
+#include <qbytearray.h>
+#include <qdebug.h>
+
+#include "symbianaudiodeviceinfo.h"
+#include "symbianaudioinput.h"
+#include "symbianaudiooutput.h"
+
+QT_BEGIN_NAMESPACE
+
+class SymbianAudioPlugin : public QAudioEnginePlugin
+{
+public:
+    SymbianAudioPlugin(QObject *parent = 0);
+    ~SymbianAudioPlugin();
+
+    QStringList keys() const;
+
+    QList<QByteArray> availableDevices(QAudio::Mode) const;
+    QAbstractAudioInput* createInput(const QByteArray& device,
+                             const QAudioFormat& format = QAudioFormat());
+    QAbstractAudioOutput* createOutput(const QByteArray& device,
+                              const QAudioFormat& format = QAudioFormat());
+    QAbstractAudioDeviceInfo* createDeviceInfo(const QByteArray& device,
+                                               QAudio::Mode mode);
+};
+
+SymbianAudioPlugin::SymbianAudioPlugin(QObject *parent)
+    :   QAudioEnginePlugin(parent)
+{
+
+}
+
+SymbianAudioPlugin::~SymbianAudioPlugin()
+{
+
+}
+
+QStringList SymbianAudioPlugin::keys() const
+{
+    QStringList keys(QLatin1String("default"));
+    keys << QLatin1String("default");
+    return keys;
+}
+
+QList<QByteArray> SymbianAudioPlugin::availableDevices(QAudio::Mode mode) const
+{
+    Q_UNUSED(mode)
+    QList<QByteArray> devices;
+    devices.append("default");
+    return devices;
+}
+
+QAbstractAudioInput* SymbianAudioPlugin::createInput(
+                         const QByteArray &device, const QAudioFormat &format)
+{
+    return new SymbianAudioInput(device, format);
+}
+
+QAbstractAudioOutput* SymbianAudioPlugin::createOutput(
+                          const QByteArray &device, const QAudioFormat &format)
+{
+    return new SymbianAudioOutput(device, format);
+}
+
+QAbstractAudioDeviceInfo* SymbianAudioPlugin::createDeviceInfo(
+                              const QByteArray& device, QAudio::Mode mode)
+{
+    return new SymbianAudioDeviceInfo(device, mode);
+}
+
+Q_EXPORT_STATIC_PLUGIN(SymbianAudioPlugin)
+Q_EXPORT_PLUGIN2(qaudio, SymbianAudioPlugin)
+
+QT_END_NAMESPACE
+
diff --git a/src/plugins/audio/symbian/symbian.pro b/src/plugins/audio/symbian/symbian.pro
new file mode 100644
index 0000000..7355daa
--- /dev/null
+++ b/src/plugins/audio/symbian/symbian.pro
@@ -0,0 +1,31 @@
+QT += multimedia
+TARGET = qaudio
+
+# Paths to DevSound headers
+INCLUDEPATH += /epoc32/include/mmf/common
+INCLUDEPATH += /epoc32/include/mmf/server
+
+HEADERS +=                              \
+           symbianaudio.h               \
+           symbianaudiodeviceinfo.h     \
+           symbianaudioinput.h          \
+           symbianaudiooutput.h         \
+           symbianaudioutils.h
+
+SOURCES +=                              \
+           main.cpp                     \
+           symbianaudiodeviceinfo.cpp   \
+           symbianaudioinput.cpp        \
+           symbianaudiooutput.cpp       \
+           symbianaudioutils.cpp
+
+LIBS += -lmmfdevsound
+
+QTDIR_build:DESTDIR = $$QT_BUILD_TREE/plugins/audio
+target.path = $$[QT_INSTALL_PLUGINS]/audio
+INSTALLS += target
+
+include(../../qpluginbase.pri)
+
+TARGET.UID3 = 0x2001E630
+
diff --git a/src/plugins/audio/symbian/symbianaudio.h b/src/plugins/audio/symbian/symbianaudio.h
new file mode 100644
index 0000000..3fc0419
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudio.h
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SYMBIANAUDIO_H
+#define SYMBIANAUDIO_H
+
+#include <QtCore/qnamespace.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace SymbianAudio {
+
+/**
+ * Default values used by audio input and output classes, when underlying
+ * DevSound instance has not yet been created.
+ */
+
+const int DefaultBufferSize = 4096; // bytes
+const int DefaultNotifyInterval = 1000; // ms
+
+/**
+ * Enumeration used to track state of internal DevSound instances.
+ * Values are translated to the corresponding QAudio::State values by
+ * SymbianAudio::Utils::stateNativeToQt.
+ */
+enum State {
+        ClosedState
+    ,   InitializingState
+    ,   ActiveState
+    ,   IdleState
+    ,   SuspendedState
+};
+
+} // namespace SymbianAudio
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/plugins/audio/symbian/symbianaudiodeviceinfo.cpp b/src/plugins/audio/symbian/symbianaudiodeviceinfo.cpp
new file mode 100644
index 0000000..9701dad
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudiodeviceinfo.cpp
@@ -0,0 +1,191 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "symbianaudiodeviceinfo.h"
+#include "symbianaudioutils.h"
+
+QT_BEGIN_NAMESPACE
+
+SymbianAudioDeviceInfo::SymbianAudioDeviceInfo(QByteArray device,
+                                               QAudio::Mode mode)
+    :   m_deviceName(device)
+    ,   m_mode(mode)
+    ,   m_updated(false)
+{
+    QT_TRAP_THROWING(m_devsound.reset(CMMFDevSound::NewL()));
+}
+
+SymbianAudioDeviceInfo::~SymbianAudioDeviceInfo()
+{
+
+}
+
+QAudioFormat SymbianAudioDeviceInfo::preferredFormat() const
+{
+    QAudioFormat format;
+    switch (m_mode) {
+    case QAudio::AudioOutput:
+        format.setFrequency(44100);
+        format.setChannels(2);
+        format.setSampleSize(16);
+        format.setByteOrder(QAudioFormat::LittleEndian);
+        format.setSampleType(QAudioFormat::SignedInt);
+        format.setCodec(QLatin1String("audio/pcm"));
+        break;
+
+    case QAudio::AudioInput:
+        format.setFrequency(8000);
+        format.setChannels(1);
+        format.setSampleSize(16);
+        format.setByteOrder(QAudioFormat::LittleEndian);
+        format.setSampleType(QAudioFormat::SignedInt);
+        format.setCodec(QLatin1String("audio/pcm"));
+        break;
+
+    default:
+        Q_ASSERT_X(false, Q_FUNC_INFO, "Invalid mode");
+    }
+
+    if (!isFormatSupported(format)) {
+        if (m_frequencies.size())
+            format.setFrequency(m_frequencies[0]);
+        if (m_channels.size())
+            format.setChannels(m_channels[0]);
+        if (m_sampleSizes.size())
+            format.setSampleSize(m_sampleSizes[0]);
+        if (m_byteOrders.size())
+            format.setByteOrder(m_byteOrders[0]);
+        if (m_sampleTypes.size())
+            format.setSampleType(m_sampleTypes[0]);
+    }
+
+    return format;
+}
+
+bool SymbianAudioDeviceInfo::isFormatSupported(
+                                 const QAudioFormat &format) const
+{
+    getSupportedFormats();
+    const bool supported =
+            m_codecs.contains(format.codec())
+        &&  m_frequencies.contains(format.frequency())
+        &&  m_channels.contains(format.channels())
+        &&  m_sampleSizes.contains(format.sampleSize())
+        &&  m_byteOrders.contains(format.byteOrder())
+        &&  m_sampleTypes.contains(format.sampleType());
+
+    return supported;
+}
+
+QAudioFormat SymbianAudioDeviceInfo::nearestFormat(const QAudioFormat &format) const
+{
+    if (isFormatSupported(format))
+        return format;
+    else
+        return preferredFormat();
+}
+
+QString SymbianAudioDeviceInfo::deviceName() const
+{
+    return m_deviceName;
+}
+
+QStringList SymbianAudioDeviceInfo::codecList()
+{
+    getSupportedFormats();
+    return m_codecs;
+}
+
+QList<int> SymbianAudioDeviceInfo::frequencyList()
+{
+    getSupportedFormats();
+    return m_frequencies;
+}
+
+QList<int> SymbianAudioDeviceInfo::channelsList()
+{
+    getSupportedFormats();
+    return m_channels;
+}
+
+QList<int> SymbianAudioDeviceInfo::sampleSizeList()
+{
+    getSupportedFormats();
+    return m_sampleSizes;
+}
+
+QList<QAudioFormat::Endian> SymbianAudioDeviceInfo::byteOrderList()
+{
+    getSupportedFormats();
+    return m_byteOrders;
+}
+
+QList<QAudioFormat::SampleType> SymbianAudioDeviceInfo::sampleTypeList()
+{
+    getSupportedFormats();
+    return m_sampleTypes;
+}
+
+QList<QByteArray> SymbianAudioDeviceInfo::deviceList(QAudio::Mode mode)
+{
+    Q_UNUSED(mode)
+    QList<QByteArray> devices;
+    devices.append("default");
+    return devices;
+}
+
+void SymbianAudioDeviceInfo::getSupportedFormats() const
+{
+    if (!m_updated) {
+        QScopedPointer<SymbianAudio::DevSoundCapabilities> caps(
+            new SymbianAudio::DevSoundCapabilities(*m_devsound, m_mode));
+
+        SymbianAudio::Utils::capabilitiesNativeToQt(*caps,
+            m_frequencies, m_channels, m_sampleSizes,
+            m_byteOrders, m_sampleTypes);
+
+        m_codecs.append(QLatin1String("audio/pcm"));
+
+        m_updated = true;
+    }
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/audio/symbian/symbianaudiodeviceinfo.h b/src/plugins/audio/symbian/symbianaudiodeviceinfo.h
new file mode 100644
index 0000000..250804d
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudiodeviceinfo.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SYMBIANAUDIODEVICEINFO_H
+#define SYMBIANAUDIODEVICEINFO_H
+
+#include <QtMultimedia/qaudioengine.h>
+#include <sounddevice.h>
+
+QT_BEGIN_NAMESPACE
+
+class SymbianAudioDeviceInfo
+    :   public QAbstractAudioDeviceInfo
+{
+    Q_OBJECT
+
+public:
+    SymbianAudioDeviceInfo(QByteArray device, QAudio::Mode mode);
+    ~SymbianAudioDeviceInfo();
+
+    // QAbstractAudioDeviceInfo
+    QAudioFormat preferredFormat() const;
+    bool isFormatSupported(const QAudioFormat &format) const;
+    QAudioFormat nearestFormat(const QAudioFormat &format) const;
+    QString deviceName() const;
+    QStringList codecList();
+    QList<int> frequencyList();
+    QList<int> channelsList();
+    QList<int> sampleSizeList();
+    QList<QAudioFormat::Endian> byteOrderList();
+    QList<QAudioFormat::SampleType> sampleTypeList();
+    QList<QByteArray> deviceList(QAudio::Mode);
+
+private:
+    void getSupportedFormats() const;
+
+private:
+    QScopedPointer<CMMFDevSound> m_devsound;
+
+    QString m_deviceName;
+    QAudio::Mode m_mode;
+
+    // Mutable to allow lazy initialization when called from const-qualified
+    // public functions (isFormatSupported, nearestFormat)
+    mutable bool m_updated;
+    mutable QStringList m_codecs;
+    mutable QList<int> m_frequencies;
+    mutable QList<int> m_channels;
+    mutable QList<int> m_sampleSizes;
+    mutable QList<QAudioFormat::Endian> m_byteOrders;
+    mutable QList<QAudioFormat::SampleType> m_sampleTypes;
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/plugins/audio/symbian/symbianaudioinput.cpp b/src/plugins/audio/symbian/symbianaudioinput.cpp
new file mode 100644
index 0000000..8200925
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudioinput.cpp
@@ -0,0 +1,595 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "symbianaudioinput.h"
+#include "symbianaudioutils.h"
+
+QT_BEGIN_NAMESPACE
+
+//-----------------------------------------------------------------------------
+// Constants
+//-----------------------------------------------------------------------------
+
+const int PushInterval = 50; // ms
+
+
+//-----------------------------------------------------------------------------
+// Private class
+//-----------------------------------------------------------------------------
+
+SymbianAudioInputPrivate::SymbianAudioInputPrivate(
+                              SymbianAudioInput *audioDevice)
+    :   m_audioDevice(audioDevice)
+{
+
+}
+
+SymbianAudioInputPrivate::~SymbianAudioInputPrivate()
+{
+
+}
+
+qint64 SymbianAudioInputPrivate::readData(char *data, qint64 len)
+{
+    qint64 totalRead = 0;
+
+    if (m_audioDevice->state() == QAudio::ActiveState ||
+        m_audioDevice->state() == QAudio::IdleState) {
+
+        while (totalRead < len) {
+            const qint64 read = m_audioDevice->read(data + totalRead,
+                                                    len - totalRead);
+            if (read > 0)
+                totalRead += read;
+            else
+                break;
+        }
+    }
+
+    return totalRead;
+}
+
+qint64 SymbianAudioInputPrivate::writeData(const char *data, qint64 len)
+{
+    Q_UNUSED(data)
+    Q_UNUSED(len)
+    return 0;
+}
+
+void SymbianAudioInputPrivate::dataReady()
+{
+    emit readyRead();
+}
+
+
+//-----------------------------------------------------------------------------
+// Public functions
+//-----------------------------------------------------------------------------
+
+SymbianAudioInput::SymbianAudioInput(const QByteArray &device,
+                                     const QAudioFormat &format)
+    :   m_device(device)
+    ,   m_format(format)
+    ,   m_clientBufferSize(SymbianAudio::DefaultBufferSize)
+    ,   m_notifyInterval(SymbianAudio::DefaultNotifyInterval)
+    ,   m_notifyTimer(new QTimer(this))
+    ,   m_error(QAudio::NoError)
+    ,   m_internalState(SymbianAudio::ClosedState)
+    ,   m_externalState(QAudio::StoppedState)
+    ,   m_pullMode(false)
+    ,   m_sink(0)
+    ,   m_pullTimer(new QTimer(this))
+    ,   m_devSoundBuffer(0)
+    ,   m_devSoundBufferSize(0)
+    ,   m_totalBytesReady(0)
+    ,   m_devSoundBufferPos(0)
+    ,   m_totalSamplesRecorded(0)
+{
+    connect(m_notifyTimer.data(), SIGNAL(timeout()), this, SIGNAL(notify()));
+
+    SymbianAudio::Utils::formatQtToNative(m_format, m_nativeFourCC,
+                                          m_nativeFormat);
+
+    m_pullTimer->setInterval(PushInterval);
+    connect(m_pullTimer.data(), SIGNAL(timeout()), this, SLOT(pullData()));
+}
+
+SymbianAudioInput::~SymbianAudioInput()
+{
+    close();
+}
+
+QIODevice* SymbianAudioInput::start(QIODevice *device)
+{
+    stop();
+
+    open();
+    if (SymbianAudio::ClosedState != m_internalState) {
+        if (device) {
+            m_pullMode = true;
+            m_sink = device;
+        } else {
+            m_sink = new SymbianAudioInputPrivate(this);
+            m_sink->open(QIODevice::ReadOnly | QIODevice::Unbuffered);
+        }
+
+        m_elapsed.restart();
+    }
+
+    return m_sink;
+}
+
+void SymbianAudioInput::stop()
+{
+    close();
+}
+
+void SymbianAudioInput::reset()
+{
+    m_totalSamplesRecorded += getSamplesRecorded();
+    m_devSound->Stop();
+    startRecording();
+}
+
+void SymbianAudioInput::suspend()
+{
+    if (SymbianAudio::ActiveState == m_internalState
+        || SymbianAudio::IdleState == m_internalState) {
+        m_notifyTimer->stop();
+        m_pullTimer->stop();
+        m_devSound->Pause();
+        const qint64 samplesRecorded = getSamplesRecorded();
+        m_totalSamplesRecorded += samplesRecorded;
+
+        if (m_devSoundBuffer) {
+            m_devSoundBufferQ.append(m_devSoundBuffer);
+            m_devSoundBuffer = 0;
+        }
+
+        setState(SymbianAudio::SuspendedState);
+    }
+}
+
+void SymbianAudioInput::resume()
+{
+    if (SymbianAudio::SuspendedState == m_internalState)
+        startDataTransfer();
+}
+
+int SymbianAudioInput::bytesReady() const
+{
+    Q_ASSERT(m_devSoundBufferPos <= m_totalBytesReady);
+    return m_totalBytesReady - m_devSoundBufferPos;
+}
+
+int SymbianAudioInput::periodSize() const
+{
+    return bufferSize();
+}
+
+void SymbianAudioInput::setBufferSize(int value)
+{
+    // Note that DevSound does not allow its client to specify the buffer size.
+    // This functionality is available via custom interfaces, but since these
+    // cannot be guaranteed to work across all DevSound implementations, we
+    // do not use them here.
+    // In order to comply with the expected bevahiour of QAudioInput, we store
+    // the value and return it from bufferSize(), but the underlying DevSound
+    // buffer size remains unchanged.
+    if (value > 0)
+        m_clientBufferSize = value;
+}
+
+int SymbianAudioInput::bufferSize() const
+{
+    return m_devSoundBufferSize ? m_devSoundBufferSize : m_clientBufferSize;
+}
+
+void SymbianAudioInput::setNotifyInterval(int ms)
+{
+    if (ms > 0) {
+        const int oldNotifyInterval = m_notifyInterval;
+        m_notifyInterval = ms;
+        if (m_notifyTimer->isActive() && ms != oldNotifyInterval)
+            m_notifyTimer->start(m_notifyInterval);
+    }
+}
+
+int SymbianAudioInput::notifyInterval() const
+{
+    return m_notifyInterval;
+}
+
+qint64 SymbianAudioInput::processedUSecs() const
+{
+    int samplesPlayed = 0;
+    if (m_devSound && SymbianAudio::SuspendedState != m_internalState)
+        samplesPlayed = getSamplesRecorded();
+
+    // Protect against division by zero
+    Q_ASSERT_X(m_format.frequency() > 0, Q_FUNC_INFO, "Invalid frequency");
+
+    const qint64 result = qint64(1000000) *
+                          (samplesPlayed + m_totalSamplesRecorded)
+                        / m_format.frequency();
+
+    return result;
+}
+
+qint64 SymbianAudioInput::elapsedUSecs() const
+{
+    const qint64 result = (QAudio::StoppedState == state()) ?
+                              0 : m_elapsed.elapsed() * 1000;
+    return result;
+}
+
+QAudio::Error SymbianAudioInput::error() const
+{
+    return m_error;
+}
+
+QAudio::State SymbianAudioInput::state() const
+{
+    return m_externalState;
+}
+
+QAudioFormat SymbianAudioInput::format() const
+{
+    return m_format;
+}
+
+//-----------------------------------------------------------------------------
+// MDevSoundObserver implementation
+//-----------------------------------------------------------------------------
+
+void SymbianAudioInput::InitializeComplete(TInt aError)
+{
+    Q_ASSERT_X(SymbianAudio::InitializingState == m_internalState,
+        Q_FUNC_INFO, "Invalid state");
+
+    if (KErrNone == aError)
+        startRecording();
+}
+
+void SymbianAudioInput::ToneFinished(TInt aError)
+{
+    Q_UNUSED(aError)
+    // This class doesn't use DevSound's tone playback functions, so should
+    // never receive this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioInput::BufferToBeFilled(CMMFBuffer *aBuffer)
+{
+    Q_UNUSED(aBuffer)
+    // This class doesn't use DevSound in play mode, so should never receive
+    // this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioInput::PlayError(TInt aError)
+{
+    Q_UNUSED(aError)
+    // This class doesn't use DevSound in play mode, so should never receive
+    // this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioInput::BufferToBeEmptied(CMMFBuffer *aBuffer)
+{
+    // Following receipt of this callback, DevSound should not provide another
+    // buffer until we have returned the current one.
+    Q_ASSERT_X(!m_devSoundBuffer, Q_FUNC_INFO, "Buffer already held");
+
+    CMMFDataBuffer *const buffer = static_cast<CMMFDataBuffer*>(aBuffer);
+
+    if (!m_devSoundBufferSize)
+        m_devSoundBufferSize = buffer->Data().MaxLength();
+
+    m_totalBytesReady += buffer->Data().Length();
+
+    if (SymbianAudio::SuspendedState == m_internalState) {
+        m_devSoundBufferQ.append(buffer);
+    } else {
+        // Will be returned to DevSound by bufferEmptied().
+        m_devSoundBuffer = buffer;
+        m_devSoundBufferPos = 0;
+
+        if (bytesReady() && !m_pullMode)
+            pushData();
+    }
+}
+
+void SymbianAudioInput::RecordError(TInt aError)
+{
+    Q_UNUSED(aError)
+    setError(QAudio::IOError);
+}
+
+void SymbianAudioInput::ConvertError(TInt aError)
+{
+    Q_UNUSED(aError)
+    // This class doesn't use DevSound's format conversion functions, so
+    // should never receive this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioInput::DeviceMessage(TUid aMessageType, const TDesC8 &aMsg)
+{
+    Q_UNUSED(aMessageType)
+    Q_UNUSED(aMsg)
+    // Ignore this callback.
+}
+
+//-----------------------------------------------------------------------------
+// Private functions
+//-----------------------------------------------------------------------------
+
+void SymbianAudioInput::open()
+{
+    Q_ASSERT_X(SymbianAudio::ClosedState == m_internalState,
+        Q_FUNC_INFO, "DevSound already opened");
+
+    QT_TRAP_THROWING( m_devSound.reset(CMMFDevSound::NewL()) )
+
+    QScopedPointer<SymbianAudio::DevSoundCapabilities> caps(
+        new SymbianAudio::DevSoundCapabilities(*m_devSound, QAudio::AudioInput));
+
+    int err = SymbianAudio::Utils::isFormatSupported(m_format, *caps) ?
+                  KErrNone : KErrNotSupported;
+
+    if (KErrNone == err) {
+        setState(SymbianAudio::InitializingState);
+        TRAP(err, m_devSound->InitializeL(*this, m_nativeFourCC,
+                                          EMMFStateRecording));
+    }
+
+    if (KErrNone != err) {
+        setError(QAudio::OpenError);
+        m_devSound.reset();
+    }
+}
+
+void SymbianAudioInput::startRecording()
+{
+    const int samplesRecorded = m_devSound->SamplesRecorded();
+    Q_ASSERT(samplesRecorded == 0);
+
+    TRAPD(err, startDevSoundL());
+    if (KErrNone == err) {
+        startDataTransfer();
+    } else {
+        setError(QAudio::OpenError);
+        close();
+    }
+}
+
+void SymbianAudioInput::startDevSoundL()
+{
+    TMMFCapabilities nativeFormat = m_devSound->Config();
+    m_nativeFormat.iBufferSize = nativeFormat.iBufferSize;
+    m_devSound->SetConfigL(m_nativeFormat);
+    m_devSound->RecordInitL();
+}
+
+void SymbianAudioInput::startDataTransfer()
+{
+    m_notifyTimer->start(m_notifyInterval);
+
+    if (m_pullMode)
+        m_pullTimer->start();
+
+    if (bytesReady()) {
+        setState(SymbianAudio::ActiveState);
+        if (!m_pullMode)
+            pushData();
+    } else {
+        if (SymbianAudio::SuspendedState == m_internalState)
+            setState(SymbianAudio::ActiveState);
+        else
+            setState(SymbianAudio::IdleState);
+    }
+}
+
+CMMFDataBuffer* SymbianAudioInput::currentBuffer() const
+{
+    CMMFDataBuffer *result = m_devSoundBuffer;
+    if (!result && !m_devSoundBufferQ.empty())
+        result = m_devSoundBufferQ.front();
+    return result;
+}
+
+void SymbianAudioInput::pushData()
+{
+    Q_ASSERT_X(bytesReady(), Q_FUNC_INFO, "No data available");
+    Q_ASSERT_X(!m_pullMode, Q_FUNC_INFO, "pushData called when in pull mode");
+    qobject_cast<SymbianAudioInputPrivate *>(m_sink)->dataReady();
+}
+
+qint64 SymbianAudioInput::read(char *data, qint64 len)
+{
+    // SymbianAudioInputPrivate is ready to read data
+
+    Q_ASSERT_X(!m_pullMode, Q_FUNC_INFO,
+        "read called when in pull mode");
+
+    qint64 bytesRead = 0;
+
+    CMMFDataBuffer *buffer = 0;
+    while ((buffer = currentBuffer()) && (bytesRead < len)) {
+        if (SymbianAudio::IdleState == m_internalState)
+            setState(SymbianAudio::ActiveState);
+
+        TDesC8 &inputBuffer = buffer->Data();
+
+        const qint64 inputBytes = bytesReady();
+        const qint64 outputBytes = len - bytesRead;
+        const qint64 copyBytes = outputBytes < inputBytes ?
+                                     outputBytes : inputBytes;
+
+        memcpy(data, inputBuffer.Ptr() + m_devSoundBufferPos, copyBytes);
+
+        m_devSoundBufferPos += copyBytes;
+        data += copyBytes;
+        bytesRead += copyBytes;
+
+        if (!bytesReady())
+            bufferEmptied();
+    }
+
+    return bytesRead;
+}
+
+void SymbianAudioInput::pullData()
+{
+    Q_ASSERT_X(m_pullMode, Q_FUNC_INFO,
+        "pullData called when in push mode");
+
+    CMMFDataBuffer *buffer = 0;
+    while (buffer = currentBuffer()) {
+        if (SymbianAudio::IdleState == m_internalState)
+            setState(SymbianAudio::ActiveState);
+
+        TDesC8 &inputBuffer = buffer->Data();
+
+        const qint64 inputBytes = bytesReady();
+        const qint64 bytesPushed = m_sink->write(
+            (char*)inputBuffer.Ptr() + m_devSoundBufferPos, inputBytes);
+
+        m_devSoundBufferPos += bytesPushed;
+
+        if (!bytesReady())
+            bufferEmptied();
+
+        if (!bytesPushed)
+            break;
+    }
+}
+
+void SymbianAudioInput::bufferEmptied()
+{
+    m_devSoundBufferPos = 0;
+
+    if (m_devSoundBuffer) {
+        m_totalBytesReady -= m_devSoundBuffer->Data().Length();
+        m_devSoundBuffer = 0;
+        m_devSound->RecordData();
+    } else {
+        Q_ASSERT(!m_devSoundBufferQ.empty());
+        m_totalBytesReady -= m_devSoundBufferQ.front()->Data().Length();
+        m_devSoundBufferQ.erase(m_devSoundBufferQ.begin());
+
+        // If the queue has been emptied, resume transfer from the hardware
+        if (m_devSoundBufferQ.empty())
+            m_devSound->RecordInitL();
+    }
+
+    Q_ASSERT(m_totalBytesReady >= 0);
+}
+
+void SymbianAudioInput::close()
+{
+    m_notifyTimer->stop();
+    m_pullTimer->stop();
+
+    m_error = QAudio::NoError;
+
+    if (m_devSound)
+        m_devSound->Stop();
+    m_devSound.reset();
+    m_devSoundBuffer = 0;
+    m_devSoundBufferSize = 0;
+    m_totalBytesReady = 0;
+
+    if (!m_pullMode) // m_sink is owned
+        delete m_sink;
+    m_pullMode = false;
+    m_sink = 0;
+
+    m_devSoundBufferQ.clear();
+    m_devSoundBufferPos = 0;
+    m_totalSamplesRecorded = 0;
+
+    setState(SymbianAudio::ClosedState);
+}
+
+qint64 SymbianAudioInput::getSamplesRecorded() const
+{
+    qint64 result = 0;
+    if (m_devSound)
+        result = qint64(m_devSound->SamplesRecorded());
+    return result;
+}
+
+void SymbianAudioInput::setError(QAudio::Error error)
+{
+    m_error = error;
+
+    // Although no state transition actually occurs here, a stateChanged event
+    // must be emitted to inform the client that the call to start() was
+    // unsuccessful.
+    if (QAudio::OpenError == error)
+        emit stateChanged(QAudio::StoppedState);
+
+    // Close the DevSound instance.  This causes a transition to StoppedState.
+    // This must be done asynchronously in case the current function was called
+    // from a DevSound event handler, in which case deleting the DevSound
+    // instance may cause an exception.
+    QMetaObject::invokeMethod(this, "close", Qt::QueuedConnection);
+}
+
+void SymbianAudioInput::setState(SymbianAudio::State newInternalState)
+{
+    const QAudio::State oldExternalState = m_externalState;
+    m_internalState = newInternalState;
+    m_externalState = SymbianAudio::Utils::stateNativeToQt(
+                            m_internalState, initializingState());
+
+    if (m_externalState != oldExternalState)
+        emit stateChanged(m_externalState);
+}
+
+QAudio::State SymbianAudioInput::initializingState() const
+{
+    return QAudio::IdleState;
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/audio/symbian/symbianaudioinput.h b/src/plugins/audio/symbian/symbianaudioinput.h
new file mode 100644
index 0000000..34b7d38
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudioinput.h
@@ -0,0 +1,177 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SYMBIANAUDIOINPUT_H
+#define SYMBIANAUDIOINPUT_H
+
+#include <QtMultimedia/qaudioengine.h>
+#include <QTime>
+#include <QTimer>
+#include <sounddevice.h>
+#include "symbianaudio.h"
+
+QT_BEGIN_NAMESPACE
+
+class SymbianAudioInput;
+
+class SymbianAudioInputPrivate : public QIODevice
+{
+    friend class SymbianAudioInput;
+    Q_OBJECT
+public:
+    SymbianAudioInputPrivate(SymbianAudioInput *audio);
+    ~SymbianAudioInputPrivate();
+
+    qint64 readData(char *data, qint64 len);
+    qint64 writeData(const char *data, qint64 len);
+
+    void dataReady();
+
+private:
+    SymbianAudioInput *const m_audioDevice;
+};
+
+class SymbianAudioInput
+    :   public QAbstractAudioInput
+    ,   public MDevSoundObserver
+{
+    friend class SymbianAudioInputPrivate;
+    Q_OBJECT
+public:
+    SymbianAudioInput(const QByteArray &device,
+                      const QAudioFormat &audioFormat);
+    ~SymbianAudioInput();
+
+    // QAbstractAudioInput
+    QIODevice* start(QIODevice *device = 0);
+    void stop();
+    void reset();
+    void suspend();
+    void resume();
+    int bytesReady() const;
+    int periodSize() const;
+    void setBufferSize(int value);
+    int bufferSize() const;
+    void setNotifyInterval(int milliSeconds);
+    int notifyInterval() const;
+    qint64 processedUSecs() const;
+    qint64 elapsedUSecs() const;
+    QAudio::Error error() const;
+    QAudio::State state() const;
+    QAudioFormat format() const;
+
+    // MDevSoundObserver
+    void InitializeComplete(TInt aError);
+    void ToneFinished(TInt aError);
+    void BufferToBeFilled(CMMFBuffer *aBuffer);
+    void PlayError(TInt aError);
+    void BufferToBeEmptied(CMMFBuffer *aBuffer);
+    void RecordError(TInt aError);
+    void ConvertError(TInt aError);
+    void DeviceMessage(TUid aMessageType, const TDesC8 &aMsg);
+
+private slots:
+    void pullData();
+
+private:
+   void open();
+   void startRecording();
+   void startDevSoundL();
+   void startDataTransfer();
+   CMMFDataBuffer* currentBuffer() const;
+   void pushData();
+   qint64 read(char *data, qint64 len);
+   void bufferEmptied();
+   Q_INVOKABLE void close();
+
+   qint64 getSamplesRecorded() const;
+
+   void setError(QAudio::Error error);
+   void setState(SymbianAudio::State state);
+
+   QAudio::State initializingState() const;
+
+private:
+    const QByteArray m_device;
+    const QAudioFormat m_format;
+
+    int m_clientBufferSize;
+    int m_notifyInterval;
+    QScopedPointer<QTimer> m_notifyTimer;
+    QTime m_elapsed;
+    QAudio::Error m_error;
+
+    SymbianAudio::State m_internalState;
+    QAudio::State m_externalState;
+
+    bool m_pullMode;
+    QIODevice *m_sink;
+
+    QScopedPointer<QTimer> m_pullTimer;
+
+    QScopedPointer<CMMFDevSound> m_devSound;
+    TUint32 m_nativeFourCC;
+    TMMFCapabilities m_nativeFormat;
+
+    // Latest buffer provided by DevSound, to be empied of data.
+    CMMFDataBuffer *m_devSoundBuffer;
+
+    int m_devSoundBufferSize;
+
+    // Total amount of data in buffers provided by DevSound
+    int m_totalBytesReady;
+
+    // Queue of buffers returned after call to CMMFDevSound::Pause().
+    QList<CMMFDataBuffer *> m_devSoundBufferQ;
+
+    // Current read position within m_devSoundBuffer
+    qint64 m_devSoundBufferPos;
+
+    // Samples recorded up to the last call to suspend().  It is necessary
+    // to cache this because suspend() is implemented using
+    // CMMFDevSound::Stop(), which resets DevSound's SamplesRecorded() counter.
+    quint32 m_totalSamplesRecorded;
+
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/plugins/audio/symbian/symbianaudiooutput.cpp b/src/plugins/audio/symbian/symbianaudiooutput.cpp
new file mode 100644
index 0000000..385e169
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudiooutput.cpp
@@ -0,0 +1,697 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "symbianaudiooutput.h"
+#include "symbianaudioutils.h"
+
+QT_BEGIN_NAMESPACE
+
+//-----------------------------------------------------------------------------
+// Constants
+//-----------------------------------------------------------------------------
+
+const int UnderflowTimerInterval = 50; // ms
+
+
+//-----------------------------------------------------------------------------
+// Private class
+//-----------------------------------------------------------------------------
+
+SymbianAudioOutputPrivate::SymbianAudioOutputPrivate(
+                               SymbianAudioOutput *audioDevice)
+    :   m_audioDevice(audioDevice)
+{
+
+}
+
+SymbianAudioOutputPrivate::~SymbianAudioOutputPrivate()
+{
+
+}
+
+qint64 SymbianAudioOutputPrivate::readData(char *data, qint64 len)
+{
+    Q_UNUSED(data)
+    Q_UNUSED(len)
+    return 0;
+}
+
+qint64 SymbianAudioOutputPrivate::writeData(const char *data, qint64 len)
+{
+    qint64 totalWritten = 0;
+
+    if (m_audioDevice->state() == QAudio::ActiveState ||
+        m_audioDevice->state() == QAudio::IdleState) {
+
+        while (totalWritten < len) {
+            const qint64 written = m_audioDevice->pushData(data + totalWritten,
+                                                           len - totalWritten);
+            if (written > 0)
+                totalWritten += written;
+            else
+                break;
+        }
+    }
+
+    return totalWritten;
+}
+
+
+//-----------------------------------------------------------------------------
+// Public functions
+//-----------------------------------------------------------------------------
+
+SymbianAudioOutput::SymbianAudioOutput(const QByteArray &device,
+                                       const QAudioFormat &format)
+    :   m_device(device)
+    ,   m_format(format)
+    ,   m_clientBufferSize(SymbianAudio::DefaultBufferSize)
+    ,   m_notifyInterval(SymbianAudio::DefaultNotifyInterval)
+    ,   m_notifyTimer(new QTimer(this))
+    ,   m_error(QAudio::NoError)
+    ,   m_internalState(SymbianAudio::ClosedState)
+    ,   m_externalState(QAudio::StoppedState)
+    ,   m_pullMode(false)
+    ,   m_source(0)
+    ,   m_devSoundBuffer(0)
+    ,   m_devSoundBufferSize(0)
+    ,   m_bytesWritten(0)
+    ,   m_pushDataReady(false)
+    ,   m_bytesPadding(0)
+    ,   m_underflow(false)
+    ,   m_lastBuffer(false)
+    ,   m_underflowTimer(new QTimer(this))
+    ,   m_samplesPlayed(0)
+    ,   m_totalSamplesPlayed(0)
+{
+    connect(m_notifyTimer.data(), SIGNAL(timeout()), this, SIGNAL(notify()));
+
+    SymbianAudio::Utils::formatQtToNative(m_format, m_nativeFourCC,
+                                          m_nativeFormat);
+
+    m_underflowTimer->setInterval(UnderflowTimerInterval);
+    connect(m_underflowTimer.data(), SIGNAL(timeout()), this,
+            SLOT(underflowTimerExpired()));
+}
+
+SymbianAudioOutput::~SymbianAudioOutput()
+{
+    close();
+}
+
+QIODevice* SymbianAudioOutput::start(QIODevice *device)
+{
+    stop();
+
+    // We have to set these before the call to open() because of the
+    // logic in initializingState()
+    if (device) {
+        m_pullMode = true;
+        m_source = device;
+    }
+
+    open();
+
+    if (SymbianAudio::ClosedState != m_internalState) {
+        if (device) {
+            connect(m_source, SIGNAL(readyRead()), this, SLOT(dataReady()));
+        } else {
+            m_source = new SymbianAudioOutputPrivate(this);
+            m_source->open(QIODevice::WriteOnly | QIODevice::Unbuffered);
+        }
+
+        m_elapsed.restart();
+    }
+
+    return m_source;
+}
+
+void SymbianAudioOutput::stop()
+{
+    close();
+}
+
+void SymbianAudioOutput::reset()
+{
+    m_totalSamplesPlayed += getSamplesPlayed();
+    m_devSound->Stop();
+    m_bytesPadding = 0;
+    startPlayback();
+}
+
+void SymbianAudioOutput::suspend()
+{
+    if (SymbianAudio::ActiveState == m_internalState
+        || SymbianAudio::IdleState == m_internalState) {
+        m_notifyTimer->stop();
+        m_underflowTimer->stop();
+
+        const qint64 samplesWritten = SymbianAudio::Utils::bytesToSamples(
+                                          m_format, m_bytesWritten);
+        m_bytesWritten = 0;
+
+        const qint64 samplesPlayed = getSamplesPlayed();
+
+        // CMMFDevSound::Pause() is not guaranteed to work correctly in all
+        // implementations, for play-mode DevSound sessions.  We therefore
+        // have to implement suspend() by calling CMMFDevSound::Stop().
+        // Because this causes buffered data to be dropped, we replace the
+        // lost data with silence following a call to resume(), in order to
+        // ensure that processedUSecs() returns the correct value.
+        m_devSound->Stop();
+        m_totalSamplesPlayed += samplesPlayed;
+
+        // Calculate the amount of data dropped
+        const qint64 paddingSamples = samplesWritten - samplesPlayed;
+        m_bytesPadding = SymbianAudio::Utils::samplesToBytes(m_format,
+                                                             paddingSamples);
+
+        setState(SymbianAudio::SuspendedState);
+    }
+}
+
+void SymbianAudioOutput::resume()
+{
+    if (SymbianAudio::SuspendedState == m_internalState)
+        startPlayback();
+}
+
+int SymbianAudioOutput::bytesFree() const
+{
+    int result = 0;
+    if (m_devSoundBuffer) {
+        const TDes8 &outputBuffer = m_devSoundBuffer->Data();
+        result = outputBuffer.MaxLength() - outputBuffer.Length();
+    }
+    return result;
+}
+
+int SymbianAudioOutput::periodSize() const
+{
+    return bufferSize();
+}
+
+void SymbianAudioOutput::setBufferSize(int value)
+{
+    // Note that DevSound does not allow its client to specify the buffer size.
+    // This functionality is available via custom interfaces, but since these
+    // cannot be guaranteed to work across all DevSound implementations, we
+    // do not use them here.
+    // In order to comply with the expected bevahiour of QAudioOutput, we store
+    // the value and return it from bufferSize(), but the underlying DevSound
+    // buffer size remains unchanged.
+    if (value > 0)
+        m_clientBufferSize = value;
+}
+
+int SymbianAudioOutput::bufferSize() const
+{
+    return m_devSoundBufferSize ? m_devSoundBufferSize : m_clientBufferSize;
+}
+
+void SymbianAudioOutput::setNotifyInterval(int ms)
+{
+    if (ms > 0) {
+        const int oldNotifyInterval = m_notifyInterval;
+        m_notifyInterval = ms;
+        if (m_notifyTimer->isActive() && ms != oldNotifyInterval)
+            m_notifyTimer->start(m_notifyInterval);
+    }
+}
+
+int SymbianAudioOutput::notifyInterval() const
+{
+    return m_notifyInterval;
+}
+
+qint64 SymbianAudioOutput::processedUSecs() const
+{
+    int samplesPlayed = 0;
+    if (m_devSound && SymbianAudio::SuspendedState != m_internalState)
+        samplesPlayed = getSamplesPlayed();
+
+    // Protect against division by zero
+    Q_ASSERT_X(m_format.frequency() > 0, Q_FUNC_INFO, "Invalid frequency");
+
+    const qint64 result = qint64(1000000) *
+                          (samplesPlayed + m_totalSamplesPlayed)
+                        / m_format.frequency();
+
+    return result;
+}
+
+qint64 SymbianAudioOutput::elapsedUSecs() const
+{
+    const qint64 result = (QAudio::StoppedState == state()) ?
+                              0 : m_elapsed.elapsed() * 1000;
+    return result;
+}
+
+QAudio::Error SymbianAudioOutput::error() const
+{
+    return m_error;
+}
+
+QAudio::State SymbianAudioOutput::state() const
+{
+    return m_externalState;
+}
+
+QAudioFormat SymbianAudioOutput::format() const
+{
+    return m_format;
+}
+
+//-----------------------------------------------------------------------------
+// MDevSoundObserver implementation
+//-----------------------------------------------------------------------------
+
+void SymbianAudioOutput::InitializeComplete(TInt aError)
+{
+    Q_ASSERT_X(SymbianAudio::InitializingState == m_internalState,
+        Q_FUNC_INFO, "Invalid state");
+
+    if (KErrNone == aError)
+        startPlayback();
+}
+
+void SymbianAudioOutput::ToneFinished(TInt aError)
+{
+    Q_UNUSED(aError)
+    // This class doesn't use DevSound's tone playback functions, so should
+    // never receive this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioOutput::BufferToBeFilled(CMMFBuffer *aBuffer)
+{
+    // Following receipt of this callback, DevSound should not provide another
+    // buffer until we have returned the current one.
+    Q_ASSERT_X(!m_devSoundBuffer, Q_FUNC_INFO, "Buffer already held");
+
+    // Will be returned to DevSound by bufferFilled().
+    m_devSoundBuffer = static_cast<CMMFDataBuffer*>(aBuffer);
+
+    if (!m_devSoundBufferSize)
+        m_devSoundBufferSize = m_devSoundBuffer->Data().MaxLength();
+
+    writePaddingData();
+
+    if (m_pullMode && isDataReady() && !m_bytesPadding)
+        pullData();
+}
+
+void SymbianAudioOutput::PlayError(TInt aError)
+{
+    switch (aError) {
+    case KErrUnderflow:
+        m_underflow = true;
+        if (m_pullMode && !m_lastBuffer)
+            setError(QAudio::UnderrunError);
+        else
+            setState(SymbianAudio::IdleState);
+        break;
+    default:
+        setError(QAudio::IOError);
+        break;
+    }
+}
+
+void SymbianAudioOutput::BufferToBeEmptied(CMMFBuffer *aBuffer)
+{
+    Q_UNUSED(aBuffer)
+    // This class doesn't use DevSound in record mode, so should never receive
+    // this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioOutput::RecordError(TInt aError)
+{
+    Q_UNUSED(aError)
+    // This class doesn't use DevSound in record mode, so should never receive
+    // this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioOutput::ConvertError(TInt aError)
+{
+    Q_UNUSED(aError)
+    // This class doesn't use DevSound's format conversion functions, so
+    // should never receive this callback.
+    Q_ASSERT_X(false, Q_FUNC_INFO, "Unexpected callback");
+}
+
+void SymbianAudioOutput::DeviceMessage(TUid aMessageType, const TDesC8 &aMsg)
+{
+    Q_UNUSED(aMessageType)
+    Q_UNUSED(aMsg)
+    // Ignore this callback.
+}
+
+//-----------------------------------------------------------------------------
+// Private functions
+//-----------------------------------------------------------------------------
+
+void SymbianAudioOutput::dataReady()
+{
+    // Client-provided QIODevice has data ready to read.
+
+    Q_ASSERT_X(m_source->bytesAvailable(), Q_FUNC_INFO,
+        "readyRead signal received, but no data available");
+
+    if (!m_bytesPadding)
+        pullData();
+}
+
+void SymbianAudioOutput::underflowTimerExpired()
+{
+    const TInt samplesPlayed = getSamplesPlayed();
+    if (m_samplesPlayed && (samplesPlayed == m_samplesPlayed)) {
+        setError(QAudio::UnderrunError);
+    } else {
+        m_samplesPlayed = samplesPlayed;
+        m_underflowTimer->start();
+    }
+}
+
+void SymbianAudioOutput::open()
+{
+    Q_ASSERT_X(SymbianAudio::ClosedState == m_internalState,
+        Q_FUNC_INFO, "DevSound already opened");
+
+    QT_TRAP_THROWING( m_devSound.reset(CMMFDevSound::NewL()) )
+
+    QScopedPointer<SymbianAudio::DevSoundCapabilities> caps(
+        new SymbianAudio::DevSoundCapabilities(*m_devSound,
+                                               QAudio::AudioOutput));
+
+    int err = SymbianAudio::Utils::isFormatSupported(m_format, *caps) ?
+                  KErrNone : KErrNotSupported;
+
+    if (KErrNone == err) {
+        setState(SymbianAudio::InitializingState);
+        TRAP(err, m_devSound->InitializeL(*this, m_nativeFourCC,
+                                          EMMFStatePlaying));
+    }
+
+    if (KErrNone != err) {
+        setError(QAudio::OpenError);
+        m_devSound.reset();
+    }
+}
+
+void SymbianAudioOutput::startPlayback()
+{
+    TRAPD(err, startDevSoundL());
+    if (KErrNone == err) {
+        if (isDataReady())
+            setState(SymbianAudio::ActiveState);
+        else
+            setState(SymbianAudio::IdleState);
+
+        m_notifyTimer->start(m_notifyInterval);
+        m_underflow = false;
+
+        Q_ASSERT(m_devSound->SamplesPlayed() == 0);
+
+        writePaddingData();
+
+        if (m_pullMode && m_source->bytesAvailable() && !m_bytesPadding)
+            dataReady();
+    } else {
+        setError(QAudio::OpenError);
+        close();
+    }
+}
+
+void SymbianAudioOutput::startDevSoundL()
+{
+    TMMFCapabilities nativeFormat = m_devSound->Config();
+    m_nativeFormat.iBufferSize = nativeFormat.iBufferSize;
+    m_devSound->SetConfigL(m_nativeFormat);
+    m_devSound->PlayInitL();
+}
+
+void SymbianAudioOutput::writePaddingData()
+{
+    // See comments in suspend()
+
+    while (m_devSoundBuffer && m_bytesPadding) {
+        if (SymbianAudio::IdleState == m_internalState)
+            setState(SymbianAudio::ActiveState);
+
+        TDes8 &outputBuffer = m_devSoundBuffer->Data();
+        const qint64 outputBytes = bytesFree();
+        const qint64 paddingBytes = outputBytes < m_bytesPadding ?
+                                        outputBytes : m_bytesPadding;
+        unsigned char *ptr = const_cast<unsigned char*>(outputBuffer.Ptr());
+        Mem::FillZ(ptr, paddingBytes);
+        outputBuffer.SetLength(outputBuffer.Length() + paddingBytes);
+        m_bytesPadding -= paddingBytes;
+
+        if (m_pullMode && m_source->atEnd())
+            lastBufferFilled();
+        if (paddingBytes == outputBytes)
+            bufferFilled();
+    }
+}
+
+qint64 SymbianAudioOutput::pushData(const char *data, qint64 len)
+{
+    // Data has been written to SymbianAudioOutputPrivate
+
+    Q_ASSERT_X(!m_pullMode, Q_FUNC_INFO,
+        "pushData called when in pull mode");
+
+    const unsigned char *const inputPtr =
+        reinterpret_cast<const unsigned char*>(data);
+    qint64 bytesWritten = 0;
+
+    if (SymbianAudio::IdleState == m_internalState)
+        setState(SymbianAudio::ActiveState);
+
+    while (m_devSoundBuffer && (bytesWritten < len)) {
+        // writePaddingData() is called from BufferToBeFilled(), so we should
+        // never have any padding data left at this point.
+        Q_ASSERT_X(0 == m_bytesPadding, Q_FUNC_INFO,
+            "Padding bytes remaining in pushData");
+
+        TDes8 &outputBuffer = m_devSoundBuffer->Data();
+
+        const qint64 outputBytes = bytesFree();
+        const qint64 inputBytes = len - bytesWritten;
+        const qint64 copyBytes = outputBytes < inputBytes ?
+                                     outputBytes : inputBytes;
+
+        outputBuffer.Append(inputPtr + bytesWritten, copyBytes);
+        bytesWritten += copyBytes;
+
+        bufferFilled();
+    }
+
+    m_pushDataReady = (bytesWritten < len);
+
+    // If DevSound is still initializing (m_internalState == InitializingState),
+    // we cannot transition m_internalState to ActiveState, but we must emit
+    // an (external) state change from IdleState to ActiveState.  The following
+    // call triggers this signal.
+    setState(m_internalState);
+
+    return bytesWritten;
+}
+
+void SymbianAudioOutput::pullData()
+{
+    Q_ASSERT_X(m_pullMode, Q_FUNC_INFO,
+        "pullData called when in push mode");
+
+    if (m_bytesPadding)
+        m_bytesPadding = 1;
+
+    // writePaddingData() is called by BufferToBeFilled() before pullData(),
+    // so we should never have any padding data left at this point.
+    Q_ASSERT_X(0 == m_bytesPadding, Q_FUNC_INFO,
+        "Padding bytes remaining in pullData");
+
+    qint64 inputBytes = m_source->bytesAvailable();
+    while (m_devSoundBuffer && inputBytes) {
+        if (SymbianAudio::IdleState == m_internalState)
+            setState(SymbianAudio::ActiveState);
+
+        TDes8 &outputBuffer = m_devSoundBuffer->Data();
+
+        const qint64 outputBytes = bytesFree();
+        const qint64 copyBytes = outputBytes < inputBytes ?
+                                     outputBytes : inputBytes;
+
+        char *outputPtr = (char*)(outputBuffer.Ptr() + outputBuffer.Length());
+        const qint64 bytesCopied = m_source->read(outputPtr, copyBytes);
+        Q_ASSERT(bytesCopied == copyBytes);
+        outputBuffer.SetLength(outputBuffer.Length() + bytesCopied);
+        inputBytes -= bytesCopied;
+
+        if (m_source->atEnd())
+            lastBufferFilled();
+        else if (copyBytes == outputBytes)
+            bufferFilled();
+    }
+}
+
+void SymbianAudioOutput::bufferFilled()
+{
+    Q_ASSERT_X(m_devSoundBuffer, Q_FUNC_INFO, "No buffer to return");
+
+    const TDes8 &outputBuffer = m_devSoundBuffer->Data();
+    m_bytesWritten += outputBuffer.Length();
+
+    m_devSoundBuffer = 0;
+
+    m_samplesPlayed = getSamplesPlayed();
+    m_underflowTimer->start();
+
+    if (QAudio::UnderrunError == m_error)
+        m_error = QAudio::NoError;
+
+    m_devSound->PlayData();
+}
+
+void SymbianAudioOutput::lastBufferFilled()
+{
+    Q_ASSERT_X(m_devSoundBuffer, Q_FUNC_INFO, "No buffer to fill");
+    Q_ASSERT_X(!m_lastBuffer, Q_FUNC_INFO, "Last buffer already sent");
+    m_lastBuffer = true;
+    m_devSoundBuffer->SetLastBuffer(ETrue);
+    bufferFilled();
+}
+
+void SymbianAudioOutput::close()
+{
+    m_notifyTimer->stop();
+    m_underflowTimer->stop();
+
+    m_error = QAudio::NoError;
+
+    if (m_devSound)
+        m_devSound->Stop();
+    m_devSound.reset();
+    m_devSoundBuffer = 0;
+    m_devSoundBufferSize = 0;
+
+    if (!m_pullMode) // m_source is owned
+        delete m_source;
+    m_pullMode = false;
+    m_source = 0;
+
+    m_bytesWritten = 0;
+    m_pushDataReady = false;
+    m_bytesPadding = 0;
+    m_underflow = false;
+    m_lastBuffer = false;
+    m_samplesPlayed = 0;
+    m_totalSamplesPlayed = 0;
+
+    setState(SymbianAudio::ClosedState);
+}
+
+qint64 SymbianAudioOutput::getSamplesPlayed() const
+{
+    qint64 result = 0;
+    if (m_devSound) {
+        const qint64 samplesWritten = SymbianAudio::Utils::bytesToSamples(
+                                          m_format, m_bytesWritten);
+
+        if (m_underflow) {
+            result = samplesWritten;
+        } else {
+            // This is necessary because some DevSound implementations report
+            // that they have played more data than has actually been provided to them
+            // by the client.
+            const qint64 devSoundSamplesPlayed(m_devSound->SamplesPlayed());
+            result = qMin(devSoundSamplesPlayed, samplesWritten);
+        }
+    }
+    return result;
+}
+
+void SymbianAudioOutput::setError(QAudio::Error error)
+{
+    m_error = error;
+
+    // Although no state transition actually occurs here, a stateChanged event
+    // must be emitted to inform the client that the call to start() was
+    // unsuccessful.
+    if (QAudio::OpenError == error)
+        emit stateChanged(QAudio::StoppedState);
+
+    if (QAudio::UnderrunError == error)
+        setState(SymbianAudio::IdleState);
+    else
+        // Close the DevSound instance.  This causes a transition to
+        // StoppedState.  This must be done asynchronously in case the
+        // current function was called from a DevSound event handler, in which
+        // case deleting the DevSound instance may cause an exception.
+        QMetaObject::invokeMethod(this, "close", Qt::QueuedConnection);
+}
+
+void SymbianAudioOutput::setState(SymbianAudio::State newInternalState)
+{
+    const QAudio::State oldExternalState = m_externalState;
+    m_internalState = newInternalState;
+    m_externalState = SymbianAudio::Utils::stateNativeToQt(
+                            m_internalState, initializingState());
+
+    if (m_externalState != oldExternalState)
+        emit stateChanged(m_externalState);
+}
+
+bool SymbianAudioOutput::isDataReady() const
+{
+    return (m_source && m_source->bytesAvailable())
+        ||  m_bytesPadding
+        ||  m_pushDataReady;
+}
+
+QAudio::State SymbianAudioOutput::initializingState() const
+{
+    return isDataReady() ? QAudio::ActiveState : QAudio::IdleState;
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/audio/symbian/symbianaudiooutput.h b/src/plugins/audio/symbian/symbianaudiooutput.h
new file mode 100644
index 0000000..8994e46
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudiooutput.h
@@ -0,0 +1,199 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SYMBIANAUDIOOUTPUT_H
+#define SYMBIANAUDIOOUTPUT_H
+
+#include <QtMultimedia/qaudioengine.h>
+#include <QTime>
+#include <QTimer>
+#include <sounddevice.h>
+#include "symbianaudio.h"
+
+QT_BEGIN_NAMESPACE
+
+class SymbianAudioOutput;
+
+class SymbianAudioOutputPrivate : public QIODevice
+{
+    friend class SymbianAudioOutput;
+    Q_OBJECT
+public:
+    SymbianAudioOutputPrivate(SymbianAudioOutput *audio);
+    ~SymbianAudioOutputPrivate();
+
+    qint64 readData(char *data, qint64 len);
+    qint64 writeData(const char *data, qint64 len);
+
+private:
+    SymbianAudioOutput *const m_audioDevice;
+};
+
+class SymbianAudioOutput
+    :   public QAbstractAudioOutput
+    ,   public MDevSoundObserver
+{
+    friend class SymbianAudioOutputPrivate;
+    Q_OBJECT
+public:
+    SymbianAudioOutput(const QByteArray &device,
+                       const QAudioFormat &audioFormat);
+    ~SymbianAudioOutput();
+
+    // QAbstractAudioOutput
+    QIODevice* start(QIODevice *device = 0);
+    void stop();
+    void reset();
+    void suspend();
+    void resume();
+    int bytesFree() const;
+    int periodSize() const;
+    void setBufferSize(int value);
+    int bufferSize() const;
+    void setNotifyInterval(int milliSeconds);
+    int notifyInterval() const;
+    qint64 processedUSecs() const;
+    qint64 elapsedUSecs() const;
+    QAudio::Error error() const;
+    QAudio::State state() const;
+    QAudioFormat format() const;
+
+    // MDevSoundObserver
+    void InitializeComplete(TInt aError);
+    void ToneFinished(TInt aError);
+    void BufferToBeFilled(CMMFBuffer *aBuffer);
+    void PlayError(TInt aError);
+    void BufferToBeEmptied(CMMFBuffer *aBuffer);
+    void RecordError(TInt aError);
+    void ConvertError(TInt aError);
+    void DeviceMessage(TUid aMessageType, const TDesC8 &aMsg);
+
+private slots:
+    void dataReady();
+    void underflowTimerExpired();
+
+private:
+   void open();
+   void startPlayback();
+   void startDevSoundL();
+   void writePaddingData();
+   qint64 pushData(const char *data, qint64 len);
+   void pullData();
+   void bufferFilled();
+   void lastBufferFilled();
+   Q_INVOKABLE void close();
+
+   qint64 getSamplesPlayed() const;
+
+   void setError(QAudio::Error error);
+   void setState(SymbianAudio::State state);
+
+   bool isDataReady() const;
+   QAudio::State initializingState() const;
+
+private:
+    const QByteArray m_device;
+    const QAudioFormat m_format;
+
+    int m_clientBufferSize;
+    int m_notifyInterval;
+    QScopedPointer<QTimer> m_notifyTimer;
+    QTime m_elapsed;
+    QAudio::Error m_error;
+
+    SymbianAudio::State m_internalState;
+    QAudio::State m_externalState;
+
+    bool m_pullMode;
+    QIODevice *m_source;
+
+    QScopedPointer<CMMFDevSound> m_devSound;
+    TUint32 m_nativeFourCC;
+    TMMFCapabilities m_nativeFormat;
+
+    // Buffer provided by DevSound, to be filled with data.
+    CMMFDataBuffer *m_devSoundBuffer;
+
+    int m_devSoundBufferSize;
+
+    // Number of bytes transferred from QIODevice to QAudioOutput.  It is
+    // necessary to count this because data is dropped when suspend() is
+    // called.  The difference between the position reported by DevSound and
+    // this value allows us to calculate m_bytesPadding;
+    quint32 m_bytesWritten;
+
+    // True if client has provided data while the audio subsystem was not
+    // ready to consume it.
+    bool m_pushDataReady;
+
+    // Number of zero bytes which will be written when client calls resume().
+    quint32 m_bytesPadding;
+
+    // True if PlayError(KErrUnderflow) has been called.
+    bool m_underflow;
+
+    // True if a buffer marked with the "last buffer" flag has been provided
+    // to DevSound.
+    bool m_lastBuffer;
+
+    // Some DevSound implementations ignore all underflow errors raised by the
+    // audio driver, unless the last buffer flag has been set by the client.
+    // In push-mode playback, this flag will never be set, so the underflow
+    // error will never be reported.  In order to work around this, a timer
+    // is used, which gets reset every time the client provides more data.  If
+    // the timer expires, an underflow error is raised by this object.
+    QScopedPointer<QTimer> m_underflowTimer;
+
+    // Result of previous call to CMMFDevSound::SamplesPlayed().  This value is
+    // used to determine whether, when m_underflowTimer expires, an
+    // underflow error has actually occurred.
+    quint32 m_samplesPlayed;
+
+    // Samples played up to the last call to suspend().  It is necessary
+    // to cache this because suspend() is implemented using
+    // CMMFDevSound::Stop(), which resets DevSound's SamplesPlayed() counter.
+    quint32 m_totalSamplesPlayed;
+
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/plugins/audio/symbian/symbianaudioutils.cpp b/src/plugins/audio/symbian/symbianaudioutils.cpp
new file mode 100644
index 0000000..f04c198
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudioutils.cpp
@@ -0,0 +1,395 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "symbianaudioutils.h"
+#include <mmffourcc.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace SymbianAudio {
+
+DevSoundCapabilities::DevSoundCapabilities(CMMFDevSound &devsound,
+                                           QAudio::Mode mode)
+{
+    QT_TRAP_THROWING(constructL(devsound, mode));
+}
+
+DevSoundCapabilities::~DevSoundCapabilities()
+{
+    m_fourCC.Close();
+}
+
+void DevSoundCapabilities::constructL(CMMFDevSound &devsound,
+                                      QAudio::Mode mode)
+{
+    m_caps = devsound.Capabilities();
+
+    TMMFPrioritySettings settings;
+
+    switch (mode) {
+    case QAudio::AudioOutput:
+        settings.iState = EMMFStatePlaying;
+        devsound.GetSupportedInputDataTypesL(m_fourCC, settings);
+        break;
+
+    case QAudio::AudioInput:
+        settings.iState = EMMFStateRecording;
+        devsound.GetSupportedInputDataTypesL(m_fourCC, settings);
+        break;
+
+    default:
+        Q_ASSERT_X(false, Q_FUNC_INFO, "Invalid mode");
+    }
+}
+
+namespace Utils {
+
+//-----------------------------------------------------------------------------
+// Static data
+//-----------------------------------------------------------------------------
+
+// Sample rate / frequency
+
+typedef TMMFSampleRate SampleRateNative;
+typedef int SampleRateQt;
+
+const int SampleRateCount = 12;
+
+const SampleRateNative SampleRateListNative[SampleRateCount] = {
+        EMMFSampleRate8000Hz
+    ,   EMMFSampleRate11025Hz
+    ,   EMMFSampleRate12000Hz
+    ,   EMMFSampleRate16000Hz
+    ,   EMMFSampleRate22050Hz
+    ,   EMMFSampleRate24000Hz
+    ,   EMMFSampleRate32000Hz
+    ,   EMMFSampleRate44100Hz
+    ,   EMMFSampleRate48000Hz
+    ,   EMMFSampleRate64000Hz
+    ,   EMMFSampleRate88200Hz
+    ,   EMMFSampleRate96000Hz
+};
+
+const SampleRateQt SampleRateListQt[SampleRateCount] = {
+        8000
+    ,   11025
+    ,   12000
+    ,   16000
+    ,   22050
+    ,   24000
+    ,   32000
+    ,   44100
+    ,   48000
+    ,   64000
+    ,   88200
+    ,   96000
+};
+
+// Channels
+
+typedef TMMFMonoStereo ChannelsNative;
+typedef int ChannelsQt;
+
+const int ChannelsCount = 2;
+
+const ChannelsNative ChannelsListNative[ChannelsCount] = {
+        EMMFMono
+    ,   EMMFStereo
+};
+
+const ChannelsQt ChannelsListQt[ChannelsCount] = {
+        1
+    ,   2
+};
+
+// Encoding
+
+const int EncodingCount = 6;
+
+const TUint32 EncodingFourCC[EncodingCount] = {
+        KMMFFourCCCodePCM8              // 0
+    ,   KMMFFourCCCodePCMU8             // 1
+    ,   KMMFFourCCCodePCM16             // 2
+    ,   KMMFFourCCCodePCMU16            // 3
+    ,   KMMFFourCCCodePCM16B            // 4
+    ,   KMMFFourCCCodePCMU16B           // 5
+};
+
+// The characterised DevSound API specification states that the iEncoding
+// field in TMMFCapabilities is ignored, and that the FourCC should be used
+// to specify the PCM encoding.
+// See "SGL.GT0287.102 Multimedia DevSound Baseline Compatibility.doc" in the
+// mm_info/mm_docs repository.
+const TMMFSoundEncoding EncodingNative[EncodingCount] = {
+        EMMFSoundEncoding16BitPCM       // 0
+    ,   EMMFSoundEncoding16BitPCM       // 1
+    ,   EMMFSoundEncoding16BitPCM       // 2
+    ,   EMMFSoundEncoding16BitPCM       // 3
+    ,   EMMFSoundEncoding16BitPCM       // 4
+    ,   EMMFSoundEncoding16BitPCM       // 5
+};
+
+
+const int EncodingSampleSize[EncodingCount] = {
+        8                               // 0
+    ,   8                               // 1
+    ,   16                              // 2
+    ,   16                              // 3
+    ,   16                              // 4
+    ,   16                              // 5
+};
+
+const QAudioFormat::Endian EncodingByteOrder[EncodingCount] = {
+        QAudioFormat::LittleEndian      // 0
+    ,   QAudioFormat::LittleEndian      // 1
+    ,   QAudioFormat::LittleEndian      // 2
+    ,   QAudioFormat::LittleEndian      // 3
+    ,   QAudioFormat::BigEndian         // 4
+    ,   QAudioFormat::BigEndian         // 5
+};
+
+const QAudioFormat::SampleType EncodingSampleType[EncodingCount] = {
+        QAudioFormat::SignedInt         // 0
+    ,   QAudioFormat::UnSignedInt       // 1
+    ,   QAudioFormat::SignedInt         // 2
+    ,   QAudioFormat::UnSignedInt       // 3
+    ,   QAudioFormat::SignedInt         // 4
+    ,   QAudioFormat::UnSignedInt       // 5
+};
+
+
+//-----------------------------------------------------------------------------
+// Private functions
+//-----------------------------------------------------------------------------
+
+// Helper functions for implementing parameter conversions
+
+template<typename Input>
+bool findValue(const Input *inputArray, int length, Input input, int &index) {
+    bool result = false;
+    for (int i=0; !result && i<length; ++i)
+        if (inputArray[i] == input) {
+            index = i;
+            result = true;
+        }
+    return result;
+}
+
+template<typename Input, typename Output>
+bool convertValue(const Input *inputArray, const Output *outputArray,
+    int length, Input input, Output &output) {
+    int index;
+    const bool result = findValue<Input>(inputArray, length, input, index);
+    if (result)
+        output = outputArray[index];
+    return result;
+}
+
+/**
+ * Macro which is used to generate the implementation of the conversion
+ * functions.  The implementation is just a wrapper around the templated
+ * convertValue function, e.g.
+ *
+ * CONVERSION_FUNCTION_IMPL(SampleRate, Qt, Native)
+ *
+ * expands to
+ *
+ * bool SampleRateQtToNative(int input, TMMFSampleRate &output) {
+ *      return convertValue<SampleRateQt, SampleRateNative>
+ *          (SampleRateListQt, SampleRateListNative, SampleRateCount,
+ *          input, output);
+ * }
+ */
+#define CONVERSION_FUNCTION_IMPL(FieldLc, Field, Input, Output)               \
+bool FieldLc##Input##To##Output(Field##Input input, Field##Output &output) {  \
+    return convertValue<Field##Input, Field##Output>(Field##List##Input,      \
+        Field##List##Output, Field##Count, input, output);                    \
+}
+
+//-----------------------------------------------------------------------------
+// Local helper functions
+//-----------------------------------------------------------------------------
+
+CONVERSION_FUNCTION_IMPL(sampleRate, SampleRate, Qt, Native)
+CONVERSION_FUNCTION_IMPL(sampleRate, SampleRate, Native, Qt)
+CONVERSION_FUNCTION_IMPL(channels, Channels, Qt, Native)
+CONVERSION_FUNCTION_IMPL(channels, Channels, Native, Qt)
+
+bool sampleInfoQtToNative(int inputSampleSize,
+                          QAudioFormat::Endian inputByteOrder,
+                          QAudioFormat::SampleType inputSampleType,
+                          TUint32 &outputFourCC,
+                          TMMFSoundEncoding &outputEncoding) {
+
+    bool found = false;
+
+    for (int i=0; i<EncodingCount && !found; ++i) {
+        if (    EncodingSampleSize[i] == inputSampleSize
+            &&  EncodingByteOrder[i] == inputByteOrder
+            &&  EncodingSampleType[i] == inputSampleType) {
+            outputFourCC = EncodingFourCC[i];
+            outputEncoding = EncodingNative[i]; // EMMFSoundEncoding16BitPCM
+            found = true;
+        }
+    }
+
+    return found;
+}
+
+//-----------------------------------------------------------------------------
+// Public functions
+//-----------------------------------------------------------------------------
+
+void capabilitiesNativeToQt(const DevSoundCapabilities &caps,
+                            QList<int> &frequencies,
+                            QList<int> &channels,
+                            QList<int> &sampleSizes,
+                            QList<QAudioFormat::Endian> &byteOrders,
+                            QList<QAudioFormat::SampleType> &sampleTypes) {
+
+    frequencies.clear();
+    sampleSizes.clear();
+    byteOrders.clear();
+    sampleTypes.clear();
+    channels.clear();
+
+    for (int i=0; i<SampleRateCount; ++i)
+        if (caps.caps().iRate & SampleRateListNative[i])
+            frequencies += SampleRateListQt[i];
+
+    for (int i=0; i<ChannelsCount; ++i)
+        if (caps.caps().iChannels & ChannelsListNative[i])
+            channels += ChannelsListQt[i];
+
+    for (int i=0; i<EncodingCount; ++i) {
+        if (caps.fourCC().Find(EncodingFourCC[i]) != KErrNotFound) {
+            sampleSizes += EncodingSampleSize[i];
+            byteOrders += EncodingByteOrder[i];
+            sampleTypes += EncodingSampleType[i];
+        }
+    }
+
+}
+
+bool isFormatSupported(const QAudioFormat &formatQt,
+                       const DevSoundCapabilities &caps) {
+    TMMFCapabilities formatNative;
+    TUint32 fourCC;
+
+    bool result = false;
+    if (formatQt.codec() == "audio/pcm" &&
+        formatQtToNative(formatQt, fourCC, formatNative)) {
+        result =
+                (formatNative.iRate & caps.caps().iRate)
+            &&  (formatNative.iChannels & caps.caps().iChannels)
+            &&  (caps.fourCC().Find(fourCC) != KErrNotFound);
+    }
+    return result;
+}
+
+bool formatQtToNative(const QAudioFormat &inputFormat,
+                      TUint32 &outputFourCC,
+                      TMMFCapabilities &outputFormat) {
+
+    bool result = false;
+
+    // Need to use temporary variables because TMMFCapabilities fields are all
+    // TInt, rather than MMF enumerated types.
+    TMMFSampleRate outputSampleRate;
+    TMMFMonoStereo outputChannels;
+    TMMFSoundEncoding outputEncoding;
+
+    if (inputFormat.codec() == "audio/pcm") {
+        result =
+                sampleRateQtToNative(inputFormat.frequency(), outputSampleRate)
+            &&  channelsQtToNative(inputFormat.channels(), outputChannels)
+            &&  sampleInfoQtToNative(inputFormat.sampleSize(),
+                                     inputFormat.byteOrder(),
+                                     inputFormat.sampleType(),
+                                     outputFourCC,
+                                     outputEncoding);
+    }
+
+    if (result) {
+        outputFormat.iRate = outputSampleRate;
+        outputFormat.iChannels = outputChannels;
+        outputFormat.iEncoding = outputEncoding;
+    }
+
+    return result;
+}
+
+QAudio::State stateNativeToQt(State nativeState,
+                              QAudio::State initializingState)
+{
+    switch (nativeState) {
+    case ClosedState:
+        return QAudio::StoppedState;
+    case InitializingState:
+        return initializingState;
+    case ActiveState:
+        return QAudio::ActiveState;
+    case IdleState:
+        return QAudio::IdleState;
+    case SuspendedState:
+        return QAudio::SuspendedState;
+    default:
+        Q_ASSERT_X(false, Q_FUNC_INFO, "Invalid state");
+        return QAudio::StoppedState; // suppress compiler warning
+    }
+}
+
+qint64 bytesToSamples(const QAudioFormat &format, qint64 length)
+{
+    return length / ((format.sampleSize() / 8) * format.channels());
+}
+
+qint64 samplesToBytes(const QAudioFormat &format, qint64 samples)
+{
+    return samples * (format.sampleSize() / 8) * format.channels();
+}
+
+} // namespace Utils
+} // namespace SymbianAudio
+
+QT_END_NAMESPACE
+
+
diff --git a/src/plugins/audio/symbian/symbianaudioutils.h b/src/plugins/audio/symbian/symbianaudioutils.h
new file mode 100644
index 0000000..53274e0
--- /dev/null
+++ b/src/plugins/audio/symbian/symbianaudioutils.h
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** 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 QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SYMBIANAUDIOUTILS_H
+#define SYMBIANAUDIOUTILS_H
+
+#include <QtCore/qnamespace.h>
+#include <QtMultimedia/qaudioformat.h>
+#include <QtMultimedia/qaudio.h>
+#include <sounddevice.h>
+#include "symbianaudio.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace SymbianAudio {
+
+/*
+ * Helper class for querying DevSound codec / format support
+ */
+class DevSoundCapabilities {
+public:
+    DevSoundCapabilities(CMMFDevSound &devsound, QAudio::Mode mode);
+    ~DevSoundCapabilities();
+
+    const RArray<TFourCC>& fourCC() const   { return m_fourCC; }
+    const TMMFCapabilities& caps() const    { return m_caps; }
+
+private:
+    void constructL(CMMFDevSound &devsound, QAudio::Mode mode);
+
+private:
+    RArray<TFourCC> m_fourCC;
+    TMMFCapabilities m_caps;
+};
+
+namespace Utils {
+
+/**
+ * Convert native audio capabilities to QAudio lists.
+ */
+void capabilitiesNativeToQt(const DevSoundCapabilities &caps,
+                            QList<int> &frequencies,
+                            QList<int> &channels,
+                            QList<int> &sampleSizes,
+                            QList<QAudioFormat::Endian> &byteOrders,
+                            QList<QAudioFormat::SampleType> &sampleTypes);
+
+/**
+ * Check whether format is supported.
+ */
+bool isFormatSupported(const QAudioFormat &format,
+                       const DevSoundCapabilities &caps);
+
+/**
+ * Convert QAudioFormat to native format types.
+ *
+ * Note that, despite the name, DevSound uses TMMFCapabilities to specify
+ * single formats as well as capabilities.
+ *
+ * Note that this function does not modify outputFormat.iBufferSize.
+ */
+bool formatQtToNative(const QAudioFormat &inputFormat,
+                      TUint32 &outputFourCC,
+                      TMMFCapabilities &outputFormat);
+
+/**
+ * Convert internal states to QAudio states.
+ */
+QAudio::State stateNativeToQt(State nativeState,
+                              QAudio::State initializingState);
+
+/**
+ * Convert data length to number of samples.
+ */
+qint64 bytesToSamples(const QAudioFormat &format, qint64 length);
+
+/**
+ * Convert number of samples to data length.
+ */
+qint64 samplesToBytes(const QAudioFormat &format, qint64 samples);
+
+} // namespace Utils
+} // namespace SymbianAudio
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/qbase.pri b/src/qbase.pri
index db55365..6f2dfa4 100644
--- a/src/qbase.pri
+++ b/src/qbase.pri
@@ -108,6 +108,10 @@ symbian {
         }
     }
     load(armcc_warnings)
+
+    # workaround for the fact that some of our required includes in Symbian^3
+    # now depend upon files in epoc32/include/platform
+    INCLUDEPATH += $$OS_LAYER_SYSTEMINCLUDE
 }
 win32-borland:INCLUDEPATH += kernel
 
diff --git a/src/s60installs/qt.iby b/src/s60installs/qt.iby
index a6a96ec..724451b 100644
--- a/src/s60installs/qt.iby
+++ b/src/s60installs/qt.iby
@@ -80,6 +80,9 @@ file=ABI_DIR\BUILD_DIR\qsvgicon.dll          SHARED_LIB_DIR\qsvgicon.dll     PAG
 // Phonon MMF backend
 file=ABI_DIR\BUILD_DIR\phonon_mmf.dll        SHARED_LIB_DIR\phonon_mmf.dll   PAGED
 
+// QtMultimedia audio backend
+file=ABI_DIR\BUILD_DIR\qaudio.dll            SHARED_LIB_DIR\qaudio.dll       PAGED
+
 // graphicssystems
 file=ABI_DIR\BUILD_DIR\qvggraphicssystem.dll SHARED_LIB_DIR\qvggraphicssystem.dll     PAGED
 
@@ -109,6 +112,9 @@ data=\epoc32\data\z\resource\qt\plugins\iconengines\qsvgicon.qtplugin      resou
 // Phonon MMF backend
 data=\epoc32\data\z\resource\qt\plugins\phonon_backend\phonon_mmf.qtplugin resource\qt\plugins\phonon_backend\phonon_mmf.qtplugin
 
+// QtMultimedia audio backend
+data=\epoc32\data\qt\qtlibspluginstubs\qaudio.qtplugin resource\qt\plugins\audio\qaudio.qtplugin
+
 // graphicssystems
 data=\epoc32\data\z\resource\qt\plugins\graphicssystems\qvggraphicssystem.qtplugin      resource\qt\plugins\graphicssystems\qvggraphicssystem.qtplugin
 
diff --git a/src/s60installs/s60installs.pro b/src/s60installs/s60installs.pro
index 5318693..1f3b4a6 100644
--- a/src/s60installs/s60installs.pro
+++ b/src/s60installs/s60installs.pro
@@ -78,6 +78,12 @@ symbian: {
         DEPLOYMENT += phonon_backend_plugins
     }
 
+    contains(QT_CONFIG, audio-backend) {
+        qaudio_backend_plugins.sources += qaudio.dll
+        qaudio_backend_plugins.path = c:$$QT_PLUGINS_BASE_DIR/audio
+        DEPLOYMENT += qaudio_backend_plugins
+    }
+
     # Support backup & restore for Qt libraries
     qtbackup.sources = backup_registration.xml
     qtbackup.path = c:/private/10202D56/import/packages/$$replace(TARGET.UID3, 0x,)