audio_svr.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: audio_svr.h,v 1.1.4.2 2004/07/09 02:01:36 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 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 (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (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.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
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 * use your version of this file under the terms of any one of the
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 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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 * 
 * This file, and the files included with this file, is distributed
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 * ENJOYMENT OR NON-INFRINGEMENT.
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 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
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 * Contributor(s):
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 * ***** 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