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+/****************************************************************************
+**
+** 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