/****************************************************************************

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** General Public License version 2.1 as published by the Free Software

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****************************************************************************/

//

//  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

{

    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;

private slots:

    void dataReady();

    void underflowTimerExpired();

    void devsoundInitializeComplete(int err);

    void devsoundBufferToBeFilled(CMMFBuffer *);

    void devsoundPlayError(int err);

private:

   void open();

   void startPlayback();

   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;

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;

    SymbianAudio::DevSoundWrapper* m_devSound;

    // 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