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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/QList>
#include <QtCore/QString>
#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
// QAudio is suspended; DevSound is paused
, SuspendedPausedState
// QAudio is suspended; DevSound is stopped
, SuspendedStoppedState
};
/**
* Wrapper around DevSound instance
*/
class DevSoundWrapper
: public QObject
, public MDevSoundObserver
{
Q_OBJECT
public:
DevSoundWrapper(QAudio::Mode mode, QObject *parent = 0);
~DevSoundWrapper();
public:
// List of supported codecs; can be called once object is constructed
const QList<QString>& supportedCodecs() const;
// Asynchronous initialization function; emits devsoundInitializeComplete
void initialize(const QString& codec);
// Capabilities, for selected codec. Can be called once initialize has returned
// successfully.
const QList<int>& supportedFrequencies() const;
const QList<int>& supportedChannels() const;
const QList<int>& supportedSampleSizes() const;
const QList<QAudioFormat::Endian>& supportedByteOrders() const;
const QList<QAudioFormat::SampleType>& supportedSampleTypes() const;
bool isFormatSupported(const QAudioFormat &format) const;
int samplesProcessed() const;
bool setFormat(const QAudioFormat &format);
bool start();
// If DevSound implementation supports pause, calls pause and returns true.
// Otherwise calls stop and returns false. In this case, all DevSound buffers
// currently held by the backend must be discarded.
bool pause();
void resume();
void stop();
void bufferProcessed();
public:
// 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);
signals:
void initializeComplete(int error);
void bufferToBeProcessed(CMMFBuffer *buffer);
void processingError(int error);
private:
void getSupportedCodecs();
void populateCapabilities();
bool isResumeSupported() const;
private:
const QAudio::Mode m_mode;
TMMFState m_nativeMode;
enum State {
StateIdle,
StateInitializing,
StateInitialized
} m_state;
CMMFDevSound* m_devsound;
TFourCC m_fourcc;
QList<QString> m_supportedCodecs;
QList<int> m_supportedFrequencies;
QList<int> m_supportedChannels;
QList<int> m_supportedSampleSizes;
QList<QAudioFormat::Endian> m_supportedByteOrders;
QList<QAudioFormat::SampleType> m_supportedSampleTypes;
};
namespace Utils {
/**
* Convert internal states to QAudio states.
*/
QAudio::State stateNativeToQt(State nativeState);
/**
* 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
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