audio_svr_cntxt.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: audio_svr_cntxt.cpp,v 1.3.2.1 2004/07/09 02:01:36 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
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 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
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 * will apply. You may also obtain the license terms directly from
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 * ***** END LICENSE BLOCK ***** */
 
/*
 *  Description: 
 *
 *  This file contains the implimentation of the HXSymbianAudioServerContext
 *  class. This class specialized bsThread and provides an exection
 *  context for the Audio Server.
 *
 */
#include "hlxclib/stdlib.h"
#include "audio_svr_cntxt.h"
#include "audio_svr.h"


_LIT(kHXSymbianAudioServer, "HelixAudioServer");
static const TInt kDefaultStack = 0x4000;

//
// HXSymbianAudioServerContext::ctor
// 
HXSymbianAudioServerContext::HXSymbianAudioServerContext()
    : m_pServer(0),
      m_running(false),
      m_handleOpen(false)
{}

//
// HXSymbianAudioServerContext::dtor
//
HXSymbianAudioServerContext::~HXSymbianAudioServerContext()
{
				// make sure server is stopped
    Stop();

    m_handle.Close();
    m_startSem.Close();
}



//
// HXSymbianAudioServerContext::Start
//
// This call wraps the normal thread startup call (Run()) in order to
// wait on a startup semaphore. This ensures the server thread is 
// fully started before the calling thread proceeds.
//
void HXSymbianAudioServerContext::Start()
{
    if (!m_running)
    {
	m_startSem.CreateLocal(0);
	this->Run();
	m_startSem.Wait();
    }
}

//
// HXSymbianAudioServerContext::Stop
//
// 
//
void HXSymbianAudioServerContext::Stop()
{
    if (m_running)
    {
	m_startSem.Wait();
	m_running = false;
    }
}

bool HXSymbianAudioServerContext::Running()
{
    return m_running;
}

TInt HXSymbianAudioServerContext::Run()
{
    if (!m_running)
    {
	// close handle if previously opened
	if (m_handleOpen)
	    m_handle.Close();

	if (KErrNone == m_handle.Create(kHXSymbianAudioServer,
					HXSymbianAudioServerContext::_Main,
					kDefaultStack, 
					NULL, this, EOwnerThread))
	{
	    m_handleOpen = true;
	    m_handle.Resume();
	    m_running = true;
	}
    }

    return m_running ? KErrNone : KErrGeneral;
}

//
// HXSymbianAudioServerContext::Main
//
// This is the entry point for the new execution context. The call to
// StartServerL() blocks until the server shuts down.
//
void* HXSymbianAudioServerContext::Main()
{
    TRAPD(leaveCode, StartServerL());

    if (leaveCode != KErrNone)
    {
	User::Panic(_L("HXSymbianAudioServerContext"), leaveCode);
    }

    return (void*)0;
}    

//
// HXSymbianAudioServerContext::StartServerL
// 
// Create and start the server object and active scheduler. This call
// runs within the new execution context.
//
void HXSymbianAudioServerContext::StartServerL()
{
    HBufC* pName = HXSymbianAudioServer::AllocServerName();

    if (pName)
    {
	m_pServer = new HXSymbianAudioServer;

	m_pServer->StartL(*pName);

	// signal waiter that server has started
	m_startSem.Signal();

	CActiveScheduler::Start();
    
	delete pName;
    }

    // signal waiter that server has exited
    m_startSem.Signal();

    delete m_pServer;
    m_pServer = 0;
}

TInt HXSymbianAudioServerContext::_Main (TAny* obj)
{
    void* pstatus = 0;
    HXSymbianAudioServerContext* impl = (HXSymbianAudioServerContext*)obj;

    // increase the priority of the audio thread
    RThread().SetPriority(EPriorityMore);

    // allocate a cleanup trap for use on this thread
    CTrapCleanup* pCleanupTrap = CTrapCleanup::New();

    // install active scheduler
    CActiveScheduler::Install(new CActiveScheduler);

    pstatus = impl->Main();

    // fall out of main body
    //
    delete CActiveScheduler::Current();
    delete pCleanupTrap;

    // clean up memory allocated by stdlib functions
    CloseSTDLIB();

    // reset thread members in case this thread is restarted
    impl->m_running = false;

    return ((TInt)pstatus);
}