audio_svr.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * 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 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 
 
/*
 *  Description: 
 *  
 *  This file contains three class definitions; HXSymbianAudioServer,
 *  HXSymbianAudioSession, and HXSymbianAudioClient. Their purpose is
 *  to allow us to hide the Symbian CMdaAudioOutputStream interface.
 *
 */
#ifndef _AUDIO_SVR_H
#define _AUDIO_SVR_H

#include <stdio.h>
#include <e32base.h>
#include <bacntf.h>

#include "hxcom.h"
#include "hxausvc.h"

/*
 * class HXSymbianAudioServer
 *
 * This class specializes the Symbian OS CServer class in order to
 * implement a server to respond to requests from one or more clients.
 */
class HXSymbianAudioServer : public CServer {
public:
    HXSymbianAudioServer();
    virtual ~HXSymbianAudioServer();

    enum Commands {
	EAS_Init,
	EAS_Write,
	EAS_CancelWrite,
	EAS_Play,
	EAS_Pause,
	EAS_GetTime,
	EAS_GetBlocksBuffered,
	EAS_SetVolume,
	EAS_GetVolume,
	EAS_GetMaxVolume,
	EAS_GetMinVolume,
	EAS_Stop,
	EAS_RequestDeviceTakenNotification,
	EAS_CancelDeviceTakenNotification
    };

    virtual CSharableSession* NewSessionL(const TVersion& aVersion) const;
    void AddSession();
    void DelSession();
    TInt RunError(TInt aError);
    void NotifyDeviceTaken();

    static HBufC* AllocServerName();

private:
    int m_sessionCount;		// session count
};


/* 
 * class HXSymbianAudioClient
 *
 */
class HXSymbianAudioClient : public RSessionBase {
public:
    HXSymbianAudioClient();
				// initialize audio device
    TInt Init(int channels, int sampleRate);

    TInt Write(const IHXBuffer* pAudioBuf);

    void Write(const IHXBuffer* pAudioBuf, TRequestStatus& aStatus);

    void CancelWrite();
				// get the current time played out in ms
    TUint GetTime();
				// get the number of blocks buffered in device
    TUint GetBlocksBuffered();
				// enable playback
    TInt Play();
				// pause playback
    void Pause();
				// stop playback
    void Stop();
				// returns true if not playing
    bool Stopped();
				// get the current volume
    TInt GetVolume() const;
				// get the max volume
    TInt GetMaxVolume() const;
				// get the min volume
    TInt GetMinVolume() const;
				// set the current volume
    void SetVolume(TInt volume);
    
    void RequestDeviceTakenNotification(TRequestStatus& status);

    void CancelDeviceTakenNotification();

				// start a session with the server
    TInt Connect();

private:
    bool m_stopped;
};

#endif // _AUDIO_SVR_H