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mp4adec.cpp：源码内容
							/* ***** 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 ***** */ 
#include "hxtypes.h"
#include "hxresult.h"
#include "hxassert.h"
#include "hxwintyp.h"
#include "hxcom.h"
#include "hxcomm.h"
#include "ihxpckts.h"
#include "hxplugn.h"
#include "hxengin.h"
#include "hxerror.h"
#include "hxformt.h"
#include "hxslist.h"
#include "dllaccesbridge.h"
#include "dllpath.h"
#include "hxacodec.h"
#include "hxstrutl.h"
#include "mp4adec.h"
#if defined(HELIX_FEATURE_AUDIO_CODEC_AMRNB)
#include "amrdecinfo.h"
#endif
#if defined(HELIX_FEATURE_AUDIO_CODEC_AMRWB)
#include "amrwbdecinfo.h"
#endif
#if defined(HELIX_FEATURE_AUDIO_CODEC_RAAC)
#include "raacdecinfo.h"
#endif
#if defined(HELIX_FEATURE_AUDIO_CODEC_AAC)
#include "aacdecinfo.h"
#endif
#if defined(HELIX_FEATURE_AUDIO_CODEC_MP3)
#include "mp3decinfo.h"
#endif
#if defined(HELIX_FEATURE_AUDIO_RALF)
#include "losslessdecinfo.h"
#endif
/****************************************************************************
 *  Method:
 *    CMP4ADecoder::CMP4ADecoder
 *
 */
CMP4ADecoder::CMP4ADecoder()
    : m_pCodecAccess(NULL)
    , m_pDecoderInfo(NULL)
{
    // Register the decoder info with m_decInfoStore
    RegisterDecoderInfo();
    // Null out lib name string
    memset(&m_szAUStr[0], 0, MAX_LIBNAME_SIZE);
}
/****************************************************************************
 *  Method:
 *    CMP4ADecoder::~CMP4ADecoder
 *
 */
CMP4ADecoder::~CMP4ADecoder()
{
    Close();
}
void CMP4ADecoder::RegisterDecoderInfo()
{
#if defined(HELIX_FEATURE_AUDIO_CODEC_RAAC)
    m_decInfoStore.RegisterInfo(new CRAACDecInfo);
#endif	// defined(HELIX_FEATURE_AUDIO_CODEC_RAAC)
#if defined(HELIX_FEATURE_AUDIO_CODEC_AAC)
    // Register AAC library name function
    m_decInfoStore.RegisterInfo(new CAACDecInfo);
#endif	// defined(HELIX_FEATURE_AUDIO_CODEC_AAC)
#if defined(HELIX_FEATURE_AUDIO_CODEC_AMRNB)
    // Register AMR-NB library name function
    m_decInfoStore.RegisterInfo(new CAMRNBDecInfo);
#endif // defined(HELIX_FEATURE_AUDIO_CODEC_AMRNB)
#if defined(HELIX_FEATURE_AUDIO_CODEC_AMRWB)
    // Register AMR-WB library name function
    m_decInfoStore.RegisterInfo(new CAMRWBDecInfo);
#endif	// defined(HELIX_FEATURE_AUDIO_CODEC_AMRWB)
#if defined(HELIX_FEATURE_AUDIO_CODEC_MP3)
    // Register MP3 library name function
    m_decInfoStore.RegisterInfo(new CMP3DecInfo);
#endif	// defined(HELIX_FEATURE_AUDIO_CODEC_MP3)
    // Register ALSD/lossless library name function
#if defined(HELIX_FEATURE_AUDIO_RALF)
    m_decInfoStore.RegisterInfo(new CLosslessDecInfo);
#endif	// HELIX_FEATURE_AUDIO_RALF
}
HX_RESULT CMP4ADecoder::Close(void)
{
    HX_DELETE(m_pCodecAccess);
    return HXR_OK;
}
/****************************************************************************
 *  Method:
 *    CMP4ADecoder::CMP4ADecoder
 *
 */
HX_RESULT CMP4ADecoder::Open(IHXValues* pHeader,
			     IHXAudioDecoder** pOutAudioDecoder,
			     IUnknown* pContext)
{
    HX_RESULT retVal = HXR_FAIL;
    if (pHeader && pOutAudioDecoder)
    {
        // Close the decoder
        Close();
        // Get the mime type
        IHXBuffer* pMimeType = NULL;
        pHeader->GetPropertyCString("MimeType", pMimeType);
        if (pMimeType)
        {
	    char pOSLibName[MAX_LIBNAME_SIZE]; /* Flawfinder: ignore */
            m_pDecoderInfo = m_decInfoStore.GetInfoFirst((const char*) pMimeType->GetBuffer());
            while (m_pDecoderInfo)
            {
                if (OS_BuildLibName(m_pDecoderInfo->GetLibName(),
                                    pOSLibName,
                                    MAX_LIBNAME_SIZE))
                {
                    retVal = HXR_OUTOFMEMORY;
                    if (!m_pCodecAccess)
                    {
                        // DLLAccess should be used to provide cross-platform support
                        m_pCodecAccess = new DLLAccessBridge(pOSLibName, 
							     DLLTYPE_CODEC, 
							     pContext);
                    }
                    if (m_pCodecAccess)
                    {
                        retVal = HXR_REQUEST_UPGRADE;
                        if (m_pCodecAccess->isOpen())
                        {
                            // we got a module so get the symbols we need
                            FPRACreateDecoderInstance fpRACreateDecoderInstance = NULL;
                            fpRACreateDecoderInstance = (FPRACreateDecoderInstance) 
                                m_pCodecAccess->getSymbol("RACreateDecoderInstance");
                            if (fpRACreateDecoderInstance)
                            {
                                IHXAudioDecoder* pAudioDecoder = NULL;
                                retVal = (*fpRACreateDecoderInstance)(IID_IHXAudioDecoder,
                                                                      (IUnknown**) &pAudioDecoder);
                                if (SUCCEEDED(retVal))
                                {
                                    retVal = CheckDecoder(pAudioDecoder);
                                    if (SUCCEEDED(retVal))
                                    {
                                        // Set the out parameter
                                        pAudioDecoder->AddRef();
                                        *pOutAudioDecoder = pAudioDecoder;
                                    }
                                }
                                HX_RELEASE(pAudioDecoder);
                            }
                        }
                    }
                }
		if (SUCCEEDED(retVal))
		{
		    break;
		}
		HX_DELETE(m_pCodecAccess);
		m_pDecoderInfo = m_decInfoStore.GetInfoNext((const char*) pMimeType->GetBuffer());
            }
        }
        HX_RELEASE(pMimeType);
    }
    return retVal;
}
#if defined(WIN32) || defined(_WIN32) || defined(_SYMBIAN)
static const char z_dllSuffix[] = ".DLL";
#elif defined(_MAC_UNIX)
static const char z_dllSuffix[] = ".bundle";
#elif _MACINTOSH 
#if defined(_CARBON)
#ifdef _MAC_MACHO
static const char z_dllSuffix[] = ".bundle";
#else
static const char z_dllSuffix[] = ".shlb";
#endif
#else	// _CARBON
static const char z_dllSuffix[] = ".DLL";
#endif	// _CARBON
#elif defined (_UNIX)
    //
    // codecs are named like this :XXXX.so" where XXXX is the
    // codec id string
    //
static const char z_dllSuffix[] = ".so";
#elif defined (_OPENWAVE)
// currently it doesn't support dynamic loading lib, so N/A
static const char z_dllSuffix[] = "";
#endif
/****************************************************************************
 *  Method:
 *    CMP4ADecoder::OS_BuildLibName
 */
BOOL CMP4ADecoder::OS_BuildLibName(const char* pLibName, 
				   char *pOSLibName, 
				   UINT32 ulBufLen)
{
    BOOL bRetVal = FALSE;
    if (pOSLibName && pLibName)
    {
#if defined(HELIX_FEATURE_AUTOUPGRADE)
        // Copy the base file name into the AU String (just
	// in case we need it)
	SafeStrCpy(m_szAUStr, pLibName, MAX_LIBNAME_SIZE);
#endif /* #if defined(HELIX_FEATURE_AUTOUPGRADE) */
	SafeStrCpy(pOSLibName, pLibName, MAX_LIBNAME_SIZE);
	// Now append the filename suffix
	SafeStrCat(pOSLibName, z_dllSuffix, ulBufLen);
	bRetVal = TRUE;
    }
    return bRetVal;
}

						