Moved Symbian audio backend into QtMultimedia.dll

Changed backend from being a plugin, to being statically compiled into
QtMultimedia.dll.  This is to achieve consistency with the backends for
other plugins, and to allow the plugin API to be modified.

Task-number: QTBUG-8994
Reviewed-by: trustme

10 files changed, 2571 insertions, 6 deletions

diff --git a/src/multimedia/audio/audio.pri b/src/multimedia/audio/audio.pri
index 625b871c..ae28a26 100644
--- a/src/multimedia/audio/audio.pri
+++ b/src/multimedia/audio/audio.pri
@@ -41,6 +41,21 @@ mac {
     !wince*:LIBS += -lwinmm
     wince*:LIBS += -lcoredll
 
+} else:symbian {
+    INCLUDEPATH += /epoc32/include/mmf/common
+    INCLUDEPATH += /epoc32/include/mmf/server
+
+    HEADERS += $$PWD/qaudio_symbian_p.h \
+               $$PWD/qaudiodeviceinfo_symbian_p.h \
+               $$PWD/qaudioinput_symbian_p.h \
+               $$PWD/qaudiooutput_symbian_p.h
+
+    SOURCES += $$PWD/qaudio_symbian_p.cpp \
+               $$PWD/qaudiodeviceinfo_symbian_p.cpp \
+               $$PWD/qaudioinput_symbian_p.cpp \
+               $$PWD/qaudiooutput_symbian_p.cpp
+
+    LIBS += -lmmfdevsound
 } else:unix {
     unix:contains(QT_CONFIG, alsa) {
         linux-*|freebsd-*|openbsd-*:{
diff --git a/src/multimedia/audio/qaudio_symbian_p.cpp b/src/multimedia/audio/qaudio_symbian_p.cpp
new file mode 100644
index 0000000..58e3745
--- /dev/null
+++ b/src/multimedia/audio/qaudio_symbian_p.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 "qaudio_symbian_p.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/multimedia/audio/qaudio_symbian_p.h b/src/multimedia/audio/qaudio_symbian_p.h
new file mode 100644
index 0000000..d5238b4
--- /dev/null
+++ b/src/multimedia/audio/qaudio_symbian_p.h
@@ -0,0 +1,156 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef QAUDIO_SYMBIAN_P_H
+#define QAUDIO_SYMBIAN_P_H
+
+#include <QtCore/qnamespace.h>
+#include <QtMultimedia/qaudioformat.h>
+#include <QtMultimedia/qaudio.h>
+#include <sounddevice.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
+};
+
+/*
+ * 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/multimedia/audio/qaudiodevicefactory.cpp b/src/multimedia/audio/qaudiodevicefactory.cpp
index 459b7f5..4f45110 100644
--- a/src/multimedia/audio/qaudiodevicefactory.cpp
+++ b/src/multimedia/audio/qaudiodevicefactory.cpp
@@ -58,6 +58,10 @@
 #include "qaudiodeviceinfo_alsa_p.h"
 #include "qaudiooutput_alsa_p.h"
 #include "qaudioinput_alsa_p.h"
+#elif defined(Q_OS_SYMBIAN)
+#include "qaudiodeviceinfo_symbian_p.h"
+#include "qaudiooutput_symbian_p.h"
+#include "qaudioinput_symbian_p.h"
 #endif
 #endif
 
@@ -128,7 +132,7 @@ QList<QAudioDeviceInfo> QAudioDeviceFactory::availableDevices(QAudio::Mode mode)
 {
     QList<QAudioDeviceInfo> devices;
 #ifndef QT_NO_AUDIO_BACKEND
-#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA))
+#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA) || defined(Q_OS_SYMBIAN))
     foreach (const QByteArray &handle, QAudioDeviceInfoInternal::availableDevices(mode))
         devices << QAudioDeviceInfo(QLatin1String("builtin"), handle, mode);
 #endif
@@ -158,7 +162,7 @@ QAudioDeviceInfo QAudioDeviceFactory::defaultInputDevice()
             return QAudioDeviceInfo(QLatin1String("default"), list.at(0), QAudio::AudioInput);
     }
 #ifndef QT_NO_AUDIO_BACKEND
-#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA))
+#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA) || defined(Q_OS_SYMBIAN))
     return QAudioDeviceInfo(QLatin1String("builtin"), QAudioDeviceInfoInternal::defaultInputDevice(), QAudio::AudioInput);
 #endif
 #endif
@@ -175,7 +179,7 @@ QAudioDeviceInfo QAudioDeviceFactory::defaultOutputDevice()
             return QAudioDeviceInfo(QLatin1String("default"), list.at(0), QAudio::AudioOutput);
     }
 #ifndef QT_NO_AUDIO_BACKEND
-#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA))
+#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA) || defined(Q_OS_SYMBIAN))
     return QAudioDeviceInfo(QLatin1String("builtin"), QAudioDeviceInfoInternal::defaultOutputDevice(), QAudio::AudioOutput);
 #endif
 #endif
@@ -187,7 +191,7 @@ QAbstractAudioDeviceInfo* QAudioDeviceFactory::audioDeviceInfo(const QString &re
     QAbstractAudioDeviceInfo *rc = 0;
 
 #ifndef QT_NO_AUDIO_BACKEND
-#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA))
+#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA) || defined(Q_OS_SYMBIAN))
     if (realm == QLatin1String("builtin"))
         return new QAudioDeviceInfoInternal(handle, mode);
 #endif
@@ -216,7 +220,7 @@ QAbstractAudioInput* QAudioDeviceFactory::createInputDevice(QAudioDeviceInfo con
     if (deviceInfo.isNull())
         return new QNullInputDevice();
 #ifndef QT_NO_AUDIO_BACKEND
-#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA))
+#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA) || defined(Q_OS_SYMBIAN))
     if (deviceInfo.realm() == QLatin1String("builtin"))
         return new QAudioInputPrivate(deviceInfo.handle(), format);
 #endif
@@ -235,7 +239,7 @@ QAbstractAudioOutput* QAudioDeviceFactory::createOutputDevice(QAudioDeviceInfo c
     if (deviceInfo.isNull())
         return new QNullOutputDevice();
 #ifndef QT_NO_AUDIO_BACKEND
-#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA))
+#if (defined(Q_OS_WIN) || defined(Q_OS_MAC) || defined(HAS_ALSA) || defined(Q_OS_SYMBIAN))
     if (deviceInfo.realm() == QLatin1String("builtin"))
         return new QAudioOutputPrivate(deviceInfo.handle(), format);
 #endif
diff --git a/src/multimedia/audio/qaudiodeviceinfo_symbian_p.cpp b/src/multimedia/audio/qaudiodeviceinfo_symbian_p.cpp
new file mode 100644
index 0000000..36284d3
--- /dev/null
+++ b/src/multimedia/audio/qaudiodeviceinfo_symbian_p.cpp
@@ -0,0 +1,200 @@
+/****************************************************************************
+**
+** 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 "qaudiodeviceinfo_symbian_p.h"
+#include "qaudio_symbian_p.h"
+
+QT_BEGIN_NAMESPACE
+
+QAudioDeviceInfoInternal::QAudioDeviceInfoInternal(QByteArray device,
+                                               QAudio::Mode mode)
+    :   m_deviceName(QLatin1String(device))
+    ,   m_mode(mode)
+    ,   m_updated(false)
+{
+    QT_TRAP_THROWING(m_devsound.reset(CMMFDevSound::NewL()));
+}
+
+QAudioDeviceInfoInternal::~QAudioDeviceInfoInternal()
+{
+
+}
+
+QAudioFormat QAudioDeviceInfoInternal::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 QAudioDeviceInfoInternal::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 QAudioDeviceInfoInternal::nearestFormat(const QAudioFormat &format) const
+{
+    if (isFormatSupported(format))
+        return format;
+    else
+        return preferredFormat();
+}
+
+QString QAudioDeviceInfoInternal::deviceName() const
+{
+    return m_deviceName;
+}
+
+QStringList QAudioDeviceInfoInternal::codecList()
+{
+    getSupportedFormats();
+    return m_codecs;
+}
+
+QList<int> QAudioDeviceInfoInternal::frequencyList()
+{
+    getSupportedFormats();
+    return m_frequencies;
+}
+
+QList<int> QAudioDeviceInfoInternal::channelsList()
+{
+    getSupportedFormats();
+    return m_channels;
+}
+
+QList<int> QAudioDeviceInfoInternal::sampleSizeList()
+{
+    getSupportedFormats();
+    return m_sampleSizes;
+}
+
+QList<QAudioFormat::Endian> QAudioDeviceInfoInternal::byteOrderList()
+{
+    getSupportedFormats();
+    return m_byteOrders;
+}
+
+QList<QAudioFormat::SampleType> QAudioDeviceInfoInternal::sampleTypeList()
+{
+    getSupportedFormats();
+    return m_sampleTypes;
+}
+
+QByteArray QAudioDeviceInfoInternal::defaultInputDevice()
+{
+    return QByteArray("default");
+}
+
+QByteArray QAudioDeviceInfoInternal::defaultOutputDevice()
+{
+    return QByteArray("default");
+}
+
+QList<QByteArray> QAudioDeviceInfoInternal::availableDevices(QAudio::Mode)
+{
+    QList<QByteArray> result;
+    result += QByteArray("default");
+    return result;
+}
+
+void QAudioDeviceInfoInternal::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/multimedia/audio/qaudiodeviceinfo_symbian_p.h b/src/multimedia/audio/qaudiodeviceinfo_symbian_p.h
new file mode 100644
index 0000000..89e539f
--- /dev/null
+++ b/src/multimedia/audio/qaudiodeviceinfo_symbian_p.h
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef QAUDIODEVICEINFO_SYMBIAN_P_H
+#define QAUDIODEVICEINFO_SYMBIAN_P_H
+
+#include <QtMultimedia/qaudioengine.h>
+#include <sounddevice.h>
+
+QT_BEGIN_NAMESPACE
+
+class QAudioDeviceInfoInternal
+    :   public QAbstractAudioDeviceInfo
+{
+    Q_OBJECT
+
+public:
+    QAudioDeviceInfoInternal(QByteArray device, QAudio::Mode mode);
+    ~QAudioDeviceInfoInternal();
+
+    // 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();
+    static QByteArray defaultInputDevice();
+    static QByteArray defaultOutputDevice();
+    static QList<QByteArray> availableDevices(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/multimedia/audio/qaudioinput_symbian_p.cpp b/src/multimedia/audio/qaudioinput_symbian_p.cpp
new file mode 100644
index 0000000..52daa88
--- /dev/null
+++ b/src/multimedia/audio/qaudioinput_symbian_p.cpp
@@ -0,0 +1,594 @@
+/****************************************************************************
+**
+** 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 "qaudioinput_symbian_p.h"
+
+QT_BEGIN_NAMESPACE
+
+//-----------------------------------------------------------------------------
+// Constants
+//-----------------------------------------------------------------------------
+
+const int PushInterval = 50; // ms
+
+
+//-----------------------------------------------------------------------------
+// Private class
+//-----------------------------------------------------------------------------
+
+SymbianAudioInputPrivate::SymbianAudioInputPrivate(
+                              QAudioInputPrivate *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
+//-----------------------------------------------------------------------------
+
+QAudioInputPrivate::QAudioInputPrivate(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()));
+}
+
+QAudioInputPrivate::~QAudioInputPrivate()
+{
+    close();
+}
+
+QIODevice* QAudioInputPrivate::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 QAudioInputPrivate::stop()
+{
+    close();
+}
+
+void QAudioInputPrivate::reset()
+{
+    m_totalSamplesRecorded += getSamplesRecorded();
+    m_devSound->Stop();
+    startRecording();
+}
+
+void QAudioInputPrivate::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 QAudioInputPrivate::resume()
+{
+    if (SymbianAudio::SuspendedState == m_internalState)
+        startDataTransfer();
+}
+
+int QAudioInputPrivate::bytesReady() const
+{
+    Q_ASSERT(m_devSoundBufferPos <= m_totalBytesReady);
+    return m_totalBytesReady - m_devSoundBufferPos;
+}
+
+int QAudioInputPrivate::periodSize() const
+{
+    return bufferSize();
+}
+
+void QAudioInputPrivate::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 QAudioInputPrivate::bufferSize() const
+{
+    return m_devSoundBufferSize ? m_devSoundBufferSize : m_clientBufferSize;
+}
+
+void QAudioInputPrivate::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 QAudioInputPrivate::notifyInterval() const
+{
+    return m_notifyInterval;
+}
+
+qint64 QAudioInputPrivate::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 QAudioInputPrivate::elapsedUSecs() const
+{
+    const qint64 result = (QAudio::StoppedState == state()) ?
+                              0 : m_elapsed.elapsed() * 1000;
+    return result;
+}
+
+QAudio::Error QAudioInputPrivate::error() const
+{
+    return m_error;
+}
+
+QAudio::State QAudioInputPrivate::state() const
+{
+    return m_externalState;
+}
+
+QAudioFormat QAudioInputPrivate::format() const
+{
+    return m_format;
+}
+
+//-----------------------------------------------------------------------------
+// MDevSoundObserver implementation
+//-----------------------------------------------------------------------------
+
+void QAudioInputPrivate::InitializeComplete(TInt aError)
+{
+    Q_ASSERT_X(SymbianAudio::InitializingState == m_internalState,
+        Q_FUNC_INFO, "Invalid state");
+
+    if (KErrNone == aError)
+        startRecording();
+}
+
+void QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::RecordError(TInt aError)
+{
+    Q_UNUSED(aError)
+    setError(QAudio::IOError);
+}
+
+void QAudioInputPrivate::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 QAudioInputPrivate::DeviceMessage(TUid aMessageType, const TDesC8 &aMsg)
+{
+    Q_UNUSED(aMessageType)
+    Q_UNUSED(aMsg)
+    // Ignore this callback.
+}
+
+//-----------------------------------------------------------------------------
+// Private functions
+//-----------------------------------------------------------------------------
+
+void QAudioInputPrivate::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 QAudioInputPrivate::startRecording()
+{
+    const int samplesRecorded = m_devSound->SamplesRecorded();
+    Q_ASSERT(samplesRecorded == 0);
+
+    TRAPD(err, startDevSoundL());
+    if (KErrNone == err) {
+        startDataTransfer();
+    } else {
+        setError(QAudio::OpenError);
+        close();
+    }
+}
+
+void QAudioInputPrivate::startDevSoundL()
+{
+    TMMFCapabilities nativeFormat = m_devSound->Config();
+    m_nativeFormat.iBufferSize = nativeFormat.iBufferSize;
+    m_devSound->SetConfigL(m_nativeFormat);
+    m_devSound->RecordInitL();
+}
+
+void QAudioInputPrivate::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* QAudioInputPrivate::currentBuffer() const
+{
+    CMMFDataBuffer *result = m_devSoundBuffer;
+    if (!result && !m_devSoundBufferQ.empty())
+        result = m_devSoundBufferQ.front();
+    return result;
+}
+
+void QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::getSamplesRecorded() const
+{
+    qint64 result = 0;
+    if (m_devSound)
+        result = qint64(m_devSound->SamplesRecorded());
+    return result;
+}
+
+void QAudioInputPrivate::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 QAudioInputPrivate::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 QAudioInputPrivate::initializingState() const
+{
+    return QAudio::IdleState;
+}
+
+QT_END_NAMESPACE
diff --git a/src/multimedia/audio/qaudioinput_symbian_p.h b/src/multimedia/audio/qaudioinput_symbian_p.h
new file mode 100644
index 0000000..ca3ccf7
--- /dev/null
+++ b/src/multimedia/audio/qaudioinput_symbian_p.h
@@ -0,0 +1,188 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef QAUDIOINPUT_SYMBIAN_P_H
+#define QAUDIOINPUT_SYMBIAN_P_H
+
+#include <QtMultimedia/qaudioengine.h>
+#include <QTime>
+#include <QTimer>
+#include <sounddevice.h>
+#include "qaudio_symbian_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QAudioInputPrivate;
+
+class SymbianAudioInputPrivate : public QIODevice
+{
+    friend class QAudioInputPrivate;
+    Q_OBJECT
+public:
+    SymbianAudioInputPrivate(QAudioInputPrivate *audio);
+    ~SymbianAudioInputPrivate();
+
+    qint64 readData(char *data, qint64 len);
+    qint64 writeData(const char *data, qint64 len);
+
+    void dataReady();
+
+private:
+    QAudioInputPrivate *const m_audioDevice;
+};
+
+class QAudioInputPrivate
+    :   public QAbstractAudioInput
+    ,   public MDevSoundObserver
+{
+    friend class SymbianAudioInputPrivate;
+    Q_OBJECT
+public:
+    QAudioInputPrivate(const QByteArray &device,
+                      const QAudioFormat &audioFormat);
+    ~QAudioInputPrivate();
+
+    // 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/multimedia/audio/qaudiooutput_symbian_p.cpp b/src/multimedia/audio/qaudiooutput_symbian_p.cpp
new file mode 100644
index 0000000..945a08d
--- /dev/null
+++ b/src/multimedia/audio/qaudiooutput_symbian_p.cpp
@@ -0,0 +1,696 @@
+/****************************************************************************
+**
+** 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 "qaudiooutput_symbian_p.h"
+
+QT_BEGIN_NAMESPACE
+
+//-----------------------------------------------------------------------------
+// Constants
+//-----------------------------------------------------------------------------
+
+const int UnderflowTimerInterval = 50; // ms
+
+
+//-----------------------------------------------------------------------------
+// Private class
+//-----------------------------------------------------------------------------
+
+SymbianAudioOutputPrivate::SymbianAudioOutputPrivate(
+                               QAudioOutputPrivate *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
+//-----------------------------------------------------------------------------
+
+QAudioOutputPrivate::QAudioOutputPrivate(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()));
+}
+
+QAudioOutputPrivate::~QAudioOutputPrivate()
+{
+    close();
+}
+
+QIODevice* QAudioOutputPrivate::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 QAudioOutputPrivate::stop()
+{
+    close();
+}
+
+void QAudioOutputPrivate::reset()
+{
+    m_totalSamplesPlayed += getSamplesPlayed();
+    m_devSound->Stop();
+    m_bytesPadding = 0;
+    startPlayback();
+}
+
+void QAudioOutputPrivate::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 QAudioOutputPrivate::resume()
+{
+    if (SymbianAudio::SuspendedState == m_internalState)
+        startPlayback();
+}
+
+int QAudioOutputPrivate::bytesFree() const
+{
+    int result = 0;
+    if (m_devSoundBuffer) {
+        const TDes8 &outputBuffer = m_devSoundBuffer->Data();
+        result = outputBuffer.MaxLength() - outputBuffer.Length();
+    }
+    return result;
+}
+
+int QAudioOutputPrivate::periodSize() const
+{
+    return bufferSize();
+}
+
+void QAudioOutputPrivate::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 QAudioOutputPrivate::bufferSize() const
+{
+    return m_devSoundBufferSize ? m_devSoundBufferSize : m_clientBufferSize;
+}
+
+void QAudioOutputPrivate::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 QAudioOutputPrivate::notifyInterval() const
+{
+    return m_notifyInterval;
+}
+
+qint64 QAudioOutputPrivate::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 QAudioOutputPrivate::elapsedUSecs() const
+{
+    const qint64 result = (QAudio::StoppedState == state()) ?
+                              0 : m_elapsed.elapsed() * 1000;
+    return result;
+}
+
+QAudio::Error QAudioOutputPrivate::error() const
+{
+    return m_error;
+}
+
+QAudio::State QAudioOutputPrivate::state() const
+{
+    return m_externalState;
+}
+
+QAudioFormat QAudioOutputPrivate::format() const
+{
+    return m_format;
+}
+
+//-----------------------------------------------------------------------------
+// MDevSoundObserver implementation
+//-----------------------------------------------------------------------------
+
+void QAudioOutputPrivate::InitializeComplete(TInt aError)
+{
+    Q_ASSERT_X(SymbianAudio::InitializingState == m_internalState,
+        Q_FUNC_INFO, "Invalid state");
+
+    if (KErrNone == aError)
+        startPlayback();
+}
+
+void QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::DeviceMessage(TUid aMessageType, const TDesC8 &aMsg)
+{
+    Q_UNUSED(aMessageType)
+    Q_UNUSED(aMsg)
+    // Ignore this callback.
+}
+
+//-----------------------------------------------------------------------------
+// Private functions
+//-----------------------------------------------------------------------------
+
+void QAudioOutputPrivate::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 QAudioOutputPrivate::underflowTimerExpired()
+{
+    const TInt samplesPlayed = getSamplesPlayed();
+    if (m_samplesPlayed && (samplesPlayed == m_samplesPlayed)) {
+        setError(QAudio::UnderrunError);
+    } else {
+        m_samplesPlayed = samplesPlayed;
+        m_underflowTimer->start();
+    }
+}
+
+void QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::startDevSoundL()
+{
+    TMMFCapabilities nativeFormat = m_devSound->Config();
+    m_nativeFormat.iBufferSize = nativeFormat.iBufferSize;
+    m_devSound->SetConfigL(m_nativeFormat);
+    m_devSound->PlayInitL();
+}
+
+void QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::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 QAudioOutputPrivate::isDataReady() const
+{
+    return (m_source && m_source->bytesAvailable())
+        ||  m_bytesPadding
+        ||  m_pushDataReady;
+}
+
+QAudio::State QAudioOutputPrivate::initializingState() const
+{
+    return isDataReady() ? QAudio::ActiveState : QAudio::IdleState;
+}
+
+QT_END_NAMESPACE
diff --git a/src/multimedia/audio/qaudiooutput_symbian_p.h b/src/multimedia/audio/qaudiooutput_symbian_p.h
new file mode 100644
index 0000000..00ccb24
--- /dev/null
+++ b/src/multimedia/audio/qaudiooutput_symbian_p.h
@@ -0,0 +1,210 @@
+/****************************************************************************
+**
+** 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of other Qt classes.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef QAUDIOOUTPUT_SYMBIAN_P_H
+#define QAUDIOOUTPUT_SYMBIAN_P_H
+
+#include <QtMultimedia/qaudioengine.h>
+#include <QTime>
+#include <QTimer>
+#include <sounddevice.h>
+#include "qaudio_symbian_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QAudioOutputPrivate;
+
+class SymbianAudioOutputPrivate : public QIODevice
+{
+    friend class QAudioOutputPrivate;
+    Q_OBJECT
+public:
+    SymbianAudioOutputPrivate(QAudioOutputPrivate *audio);
+    ~SymbianAudioOutputPrivate();
+
+    qint64 readData(char *data, qint64 len);
+    qint64 writeData(const char *data, qint64 len);
+
+private:
+    QAudioOutputPrivate *const m_audioDevice;
+};
+
+class QAudioOutputPrivate
+    :   public QAbstractAudioOutput
+    ,   public MDevSoundObserver
+{
+    friend class SymbianAudioOutputPrivate;
+    Q_OBJECT
+public:
+    QAudioOutputPrivate(const QByteArray &device,
+                       const QAudioFormat &audioFormat);
+    ~QAudioOutputPrivate();
+
+    // 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