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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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef SYMBIANAUDIOOUTPUT_H
#define SYMBIANAUDIOOUTPUT_H
#include <QtMultimedia/qaudioengine.h>
#include <QTime>
#include <QTimer>
#include <sounddevice.h>
#include "symbianaudio.h"
QT_BEGIN_NAMESPACE
class SymbianAudioOutput;
class SymbianAudioOutputPrivate : public QIODevice
{
friend class SymbianAudioOutput;
Q_OBJECT
public:
SymbianAudioOutputPrivate(SymbianAudioOutput *audio);
~SymbianAudioOutputPrivate();
qint64 readData(char *data, qint64 len);
qint64 writeData(const char *data, qint64 len);
private:
SymbianAudioOutput *const m_audioDevice;
};
class SymbianAudioOutput
: public QAbstractAudioOutput
, public MDevSoundObserver
{
friend class SymbianAudioOutputPrivate;
Q_OBJECT
public:
SymbianAudioOutput(const QByteArray &device,
const QAudioFormat &audioFormat);
~SymbianAudioOutput();
// QAbstractAudioOutput
QIODevice* start(QIODevice *device = 0);
void stop();
void reset();
void suspend();
void resume();
int bytesFree() const;
int periodSize() const;
void setBufferSize(int value);
int bufferSize() const;
void setNotifyInterval(int milliSeconds);
int notifyInterval() const;
qint64 processedUSecs() const;
qint64 elapsedUSecs() const;
QAudio::Error error() const;
QAudio::State state() const;
QAudioFormat format() const;
// MDevSoundObserver
void InitializeComplete(TInt aError);
void ToneFinished(TInt aError);
void BufferToBeFilled(CMMFBuffer *aBuffer);
void PlayError(TInt aError);
void BufferToBeEmptied(CMMFBuffer *aBuffer);
void RecordError(TInt aError);
void ConvertError(TInt aError);
void DeviceMessage(TUid aMessageType, const TDesC8 &aMsg);
private slots:
void dataReady();
void underflowTimerExpired();
private:
void open();
void startPlayback();
void startDevSoundL();
void writePaddingData();
qint64 pushData(const char *data, qint64 len);
void pullData();
void bufferFilled();
void lastBufferFilled();
Q_INVOKABLE void close();
qint64 getSamplesPlayed() const;
void setError(QAudio::Error error);
void setState(SymbianAudio::State state);
bool isDataReady() const;
QAudio::State initializingState() const;
private:
const QByteArray m_device;
const QAudioFormat m_format;
int m_clientBufferSize;
int m_notifyInterval;
QScopedPointer<QTimer> m_notifyTimer;
QTime m_elapsed;
QAudio::Error m_error;
SymbianAudio::State m_internalState;
QAudio::State m_externalState;
bool m_pullMode;
QIODevice *m_source;
QScopedPointer<CMMFDevSound> m_devSound;
TUint32 m_nativeFourCC;
TMMFCapabilities m_nativeFormat;
// Buffer provided by DevSound, to be filled with data.
CMMFDataBuffer *m_devSoundBuffer;
int m_devSoundBufferSize;
// Number of bytes transferred from QIODevice to QAudioOutput. It is
// necessary to count this because data is dropped when suspend() is
// called. The difference between the position reported by DevSound and
// this value allows us to calculate m_bytesPadding;
quint32 m_bytesWritten;
// True if client has provided data while the audio subsystem was not
// ready to consume it.
bool m_pushDataReady;
// Number of zero bytes which will be written when client calls resume().
quint32 m_bytesPadding;
// True if PlayError(KErrUnderflow) has been called.
bool m_underflow;
// True if a buffer marked with the "last buffer" flag has been provided
// to DevSound.
bool m_lastBuffer;
// Some DevSound implementations ignore all underflow errors raised by the
// audio driver, unless the last buffer flag has been set by the client.
// In push-mode playback, this flag will never be set, so the underflow
// error will never be reported. In order to work around this, a timer
// is used, which gets reset every time the client provides more data. If
// the timer expires, an underflow error is raised by this object.
QScopedPointer<QTimer> m_underflowTimer;
// Result of previous call to CMMFDevSound::SamplesPlayed(). This value is
// used to determine whether, when m_underflowTimer expires, an
// underflow error has actually occurred.
quint32 m_samplesPlayed;
// Samples played up to the last call to suspend(). It is necessary
// to cache this because suspend() is implemented using
// CMMFDevSound::Stop(), which resets DevSound's SamplesPlayed() counter.
quint32 m_totalSamplesPlayed;
};
QT_END_NAMESPACE
#endif
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