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rm_recog.cpp：源码内容
							/*============================================================================*
 *
 * (c) 1995-2002 RealNetworks, Inc. Patents pending. All rights reserved.
 *
 *============================================================================*/
/*
 *  Description:
 *
 */
#include <e32svr.h>
#include <apmrec.h>
#include <apmstd.h>
#include "hxassert.h"
//#include "debug.h"
#include "hxsym_mimetypes.h"
#include "recog_util.h"
#include "rm_recog.h"
//
// some constants
//
// UID
const TUid KUidMimeRealMediaRecognizer={0x10009D0D};
// min and max buffer length required to recognize file datatype
const TInt KMinBufferLength=4;
const TInt KMaxBufferLength=256;
//
// list of mimetypes we recognize
//
const TUint8* const k_dataTypes[] =
{
// basic datatypes always recognized
HXSYM_MIMETYPE_RM,
HXSYM_MIMETYPE_RAM,
HXSYM_MIMETYPE_SDP,
HXSYM_MIMETYPE_AMR,
// mp3
#if defined(HELIX_FEATURE_AUDIO_MPA_LAYER3)
HXSYM_MIMETYPE_MP3,
#endif
// 3gpp
#if defined(HELIX_FEATURE_3GPP)
HXSYM_MIMETYPE_3GPAUDIO,
HXSYM_MIMETYPE_3GPVIDEO,
HXSYM_MIMETYPE_MP4AUDIO,
HXSYM_MIMETYPE_MP4VIDEO,
#endif
// smil
#if defined(HELIX_FEATURE_SMIL2)
HXSYM_MIMETYPE_SMIL
#endif
};
#define ARRAY_COUNT(x) (sizeof(x) / sizeof(x[0]))
const TUint MIMETYPE_COUNT = ARRAY_COUNT(k_dataTypes);
CApaRealMediaRecognizer::CApaRealMediaRecognizer()
: CApaDataRecognizerType(KUidMimeRealMediaRecognizer, CApaDataRecognizerType::EHigh)
{
   iCountDataTypes =  MIMETYPE_COUNT;
}
TUint CApaRealMediaRecognizer::PreferredBufSize()
{
    return KMaxBufferLength;
}
TDataType CApaRealMediaRecognizer::SupportedDataTypeL(TInt aIndex) const
{
    HX_ASSERT(aIndex < MIMETYPE_COUNT);
    return TDataType(_L8(k_dataTypes[aIndex]));
}
void CApaRealMediaRecognizer::DoRecognizeL(const TDesC& aName,
					   const TDesC8& aBuffer)
{
    iConfidence = ENotRecognized;
    _LIT(KRtspScheme, "rtsp");
    // first check name for scheme ('rtsp://')
    if(RecogUtil::FindScheme(KRtspScheme, aName))
    {
        iDataType = TDataType(_L8(HXSYM_MIMETYPE_RM));
        iConfidence = ECertain;
    }
    else
    {
        // not a scheme; look at buffer...
        TInt length=aBuffer.Length();
        if (length>=KMinBufferLength)
        {
            // HXSYM_MIMETYPE_RM
            if ((iConfidence = RecogUtil::IsRMFile(aName, aBuffer)) != ENotRecognized)
            {
	        iDataType=TDataType(_L8(HXSYM_MIMETYPE_RM));
            }
            // HXSYM_MIMETYPE_SMIL
            else if ((iConfidence = RecogUtil::IsSMILFile(aName, aBuffer)) != ENotRecognized)
            {
                iDataType=TDataType(_L8(HXSYM_MIMETYPE_SMIL));
            }
            // HXSYM_MIMETYPE_SDP
	    else if ((iConfidence = RecogUtil::IsSDPFile(aName, aBuffer)) != ENotRecognized)
	    {
		iDataType=TDataType(_L8(HXSYM_MIMETYPE_SDP));
            }
            // HXSYM_MIMETYPE_RAM
            else if ((iConfidence = RecogUtil::IsRAMFile(aName, aBuffer)) != ENotRecognized)
            {
	        iDataType=TDataType(_L8(HXSYM_MIMETYPE_RAM));
            }
            // HXSYM_MIMETYPE_AMR
            else if ((iConfidence = RecogUtil::IsAMRFile(aName, aBuffer)) != ENotRecognized)
            {
	        iDataType=TDataType(_L8(HXSYM_MIMETYPE_AMR));
            }
            #if defined(HELIX_FEATURE_3GPP)
            // HXSYM_MIMETYPE_3GPAUDIO/VIDEO
            else if (RecogUtil::Is3GPPFile(aName, aBuffer) != ENotRecognized)
            {
	        if ((iConfidence = RecogUtil::IsMPEG4Audio(aName, aBuffer)) != ENotRecognized)
                {
	            iDataType=TDataType(_L8(HXSYM_MIMETYPE_3GPAUDIO));
                }
	        else
	        {
	            iDataType=TDataType(_L8(HXSYM_MIMETYPE_3GPVIDEO));
	            iConfidence = EProbable;
	        }
            }
            // HXSYM_MIMETYPE_MP4AUDIO/VIDEO
            else if (RecogUtil::IsMPEG4File(aName, aBuffer) != ENotRecognized)
            {
	        if ((iConfidence = RecogUtil::IsMPEG4Audio(aName, aBuffer)) != ENotRecognized)
                {
	            iDataType=TDataType(_L8(HXSYM_MIMETYPE_MP4AUDIO));
                }
	        else
	        {
	            iDataType=TDataType(_L8(HXSYM_MIMETYPE_MP4VIDEO));
	            iConfidence = EProbable;
	        }
            }
//HELIX_FEATURE_3GPP
#endif
#if defined(HELIX_FEATURE_AUDIO_MPA_LAYER3)
            // HXSYM_MIMETYPE_MP3
            else if ((iConfidence = RecogUtil::IsMP3File(aName, aBuffer)) != ENotRecognized)
            {
		iDataType=TDataType(_L8(HXSYM_MIMETYPE_MP3));
            }
#endif
#if !defined(HELIX_FEATURE_SMIL2)
            // HXSYM_MIMETYPE_SMIL
            if (iDataType==TDataType(_L8(HXSYM_MIMETYPE_SMIL)))
            {
		iConfidence = ENotRecognized;
	    }
#endif
        }
    }
}
EXPORT_C CApaDataRecognizerType* CreateRecognizer()
// The gate function - ordinal 1
//
{
    CApaDataRecognizerType* thing=new CApaRealMediaRecognizer();
    return thing;
}
GLDEF_C TInt E32Dll(TDllReason /*aReason*/)
//
// DLL entry point
//
{
    return KErrNone;
}

						