www.pudn.com > helix.src.0812.rar > audio_session-mda.h

/* ***** BEGIN LICENSE BLOCK *****  
 * Version: RCSL 1.0/RPSL 1.0  
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 * Portions Copyright (c) 1995-2003 RealNetworks, Inc. All Rights Reserved.  
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 * The contents of this file, and the files included with this file, are  
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 * Version 1.0 (the "RPSL") available at  
 * http://www.helixcommunity.org/content/rpsl unless you have licensed  
 * the file under the RealNetworks Community Source License Version 1.0  
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,  
 * in which case the RCSL will apply. You may also obtain the license terms  
 * directly from RealNetworks.  You may not use this file except in  
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 * applicable to this file, the RCSL.  Please see the applicable RPSL or  
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 * This file is part of the Helix DNA Technology. RealNetworks is the  
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 * it created.  
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 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,  
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 * Technology Compatibility Kit Test Suite(s) Location:  
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 * ***** END LICENSE BLOCK ***** */  
 
#ifndef _AUDIO_SESSION_H_ 
#define _AUDIO_SESSION_H_ 
 
#include  
#include  
#include  
 
#include  
#include "../audio_svr.h" 
#include "hxslist.h" 
 
class CHXSimpleList; 
 
class HXSymbianAudioTimeline 
{ 
public: 
    HXSymbianAudioTimeline(); 
    ~HXSymbianAudioTimeline(); 
     
    void Reset(UINT32 ulByteRate); // called to reset the state of this object 
 
    void OnWrite(UINT32 ulBytes); // called when bytes are written to the device 
 
    UINT32 GetPlaybackTime(); // Returns current playback time 
 
    UINT32 GetWrittenTime() const;   // Returns number of ms of data written 
    UINT32 GetWallclockTime() const; // Returns number of ms elapsed since the first 
                                     // non-zero device position was returned 
 
    void OnPlay(); 
    void OnPauseOrUnderflow(); 
 
    inline BOOL NeedDeviceTime() const; 
    void SetDeviceTime(UINT32 ulDeviceTimeMs); 
 
private: 
    inline UINT32 GetMs(UINT32 ulSec, UINT32 ulSubSec) const; // Computes milliseconds 
 
    void ClearWritten(); // Clears written bytes state 
     
    UINT32 m_ulByteRate;        // Bytes/second of audio data.  
                                // Stereo 44100 16 bit audio would be 176400 
    UINT32 m_ulSecWritten;      // Seconds of data written 
    UINT32 m_ulSubSecBytes;     // Fraction of a second written in bytes. 
    UINT32 m_ulBaseSec;         // Base time seconds 
    UINT32 m_ulBaseSubSecBytes; // Base time fraction in bytes 
 
    UINT32 m_ulLastGetTime; // return value of last GetTime() call. 
                            // This is used to force monotonically increasing 
                            // time values. 
 
    UINT32 m_ulDevTimeMs;   // First non-zero position returned from the device 
    UINT32 m_ulWallclockTime; // Wallclock time associated with m_ulDevTimeMs 
}; 
 
/* 
 * class HXSymbianAudioSession 
 * 
 */ 
class HXSymbianAudioSession : public CSession, 
			      public MMdaAudioOutputStreamCallback {  
public: 
    HXSymbianAudioSession(RThread& client, HXSymbianAudioServer* pServer); 
    virtual ~HXSymbianAudioSession(); 
 
    static HXSymbianAudioSession* NewL(RThread& client, 
				       HXSymbianAudioServer* pServer); 
    virtual void ServiceL(const RMessage& mesg); 
    void NotifyDeviceTaken(); 
 
protected: 
    void Init(); 
    void Play(); 
    void Pause(); 
    void Write(); 
    void GetTime(); 
    void GetBlocksBuffered(); 
    void SetVolume(); 
    void GetVolume(); 
    void GetMaxVolume(); 
    void GetMinVolume(); 
    void Stop(); 
 
    void RequestDeviceTakenNotification(); 
    void CancelDeviceTakenNotification(); 
 
    virtual void MaoscOpenComplete(TInt aError); 
    virtual void MaoscBufferCopied(TInt aError, const TDesC8& aBuffer); 
    virtual void MaoscPlayComplete(TInt aError); 
 
    void DoCleanup(); 
 
    UINT32 GetByteRate() const; 
    UINT32 GetDeviceMs(); 
 
    BOOL ReadyToWrite() const; 
    TInt WriteNextBuffer(); 
 
private: 
				// audio request server 
    HXSymbianAudioServer* m_pServer;	 
				// audio stream interface 
    CMdaAudioOutputStream* m_pStream; 
				// audio device sample rate 
    TMdaAudioDataSettings::TAudioCaps m_sampleRate; 
				// audio device channels 
    TMdaAudioDataSettings::TAudioCaps m_channels; 
				// audio settings 
    TMdaAudioDataSettings m_settings;  
				// temp data pointer 
    TPtr8 m_pData; 
				// async write message 
    RMessage m_writeMessage; 
 
    RMessage m_notifyRequest; 
				// flag indication notification requested 
    bool m_wantsNotify; 
				// reason device was taken 
    int m_reason; 
				// true if device has been opened 
    bool m_open; 
				// true if Complete() called on Write() msg 
    bool m_writeComplete; 
 
    HXSymbianAudioTimeline m_timeline; 
 
    CHXSimpleList m_bufferList; 
    BOOL m_bPaused; 
    BOOL m_bWritePending; 
}; 
 
#endif // _AUDIO_SESSION_H_