aud_strm_hlpr.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: aud_strm_hlpr.h,v 1.1.4.1 2004/11/24 18:07:05 acolwell 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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 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * 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):
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 * ***** END LICENSE BLOCK ***** */
#ifndef AUD_STRM_HLPR_H
#define AUD_STRM_HLPR_H

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

class COggAudioStreamHelper : public IHXDryNotification
{
public:
    COggAudioStreamHelper();
    ~COggAudioStreamHelper();

    HX_RESULT Init(IHXAudioStream* pAudioStream);
    HX_RESULT GetStreamInfo(REF(UINT32) uSampleRate, REF(UINT32) uChannels);

    HX_RESULT SetDryNotification(IHXDryNotification* pODN);

    HX_RESULT Write(HXAudioData* pAudioData);

    void Close();

    /*
     *  IUnknown methods
     */
    STDMETHOD(QueryInterface)       (THIS_
				    REFIID riid,
				    void** ppvObj);

    STDMETHOD_(ULONG32,AddRef)      (THIS);

    STDMETHOD_(ULONG32,Release)     (THIS);

    /*
     *  IHXDryNotification methods
     */

    /************************************************************************
     *  Method:
     *      IHXDryNotification::OnDryNotification
     *  Purpose:
     *	    This function is called when it is time to write to audio device 
     *	    and there is not enough data in the audio stream. The renderer can
     *	    then decide to add more data to the audio stream. This should be 
     *	    done synchronously within the call to this function.
     *	    It is OK to not write any data. Silence will be played instead.
     */
    STDMETHOD(OnDryNotification)    (THIS_
				    UINT32 /*IN*/ ulCurrentStreamTime,
				    UINT32 /*IN*/ ulMinimumDurationRequired
				    );
private:
    ULONG32 m_lRefCount;
    IHXAudioStream* m_pAudioStream;
    IHXDryNotification* m_pODN;
};
#endif /* AUD_STRM_HLPR_H */