sdpplin.cpp

linux下的一款播放器

        *ppvObj = (IHXRTPPayloadInfo*)this;
        return HXR_OK;
    }

    *ppvObj = NULL;
    return HXR_NOINTERFACE;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//        IUnknown::AddRef
//  Purpose:
//        Everyone usually implements this the same... feel free to use
//        this implementation.
//
STDMETHODIMP_(ULONG32) CSDPStreamDescription::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//        IUnknown::Release
//  Purpose:
//        Everyone usually implements this the same... feel free to use
//        this implementation.
//
STDMETHODIMP_(ULONG32) CSDPStreamDescription::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}

// *** IHXStreamDescription methods ***

CSDPStreamDescription::CSDPStreamDescription()
                : m_lRefCount(0)
                , m_pDescParser(0)
                , m_pDescGenerator(0)
                , m_pContext(0)
                , m_pCCF(0)
{
    RefCountSDPP()++;

    m_pDescParser = new SDPMediaDescParser(TARVER_ULONG32_VERSION);

#if defined(HELIX_FEATURE_SERVER)
    m_pDescGenerator = new SDPMediaDescGenerator(SDP_MEDIA_DESC_GENERATOR_VERSION);
#endif /* defined(HELIX_FEATURE_SERVER) */
}

CSDPStreamDescription::~CSDPStreamDescription()
{
    RefCountSDPP()--;

    delete m_pDescParser;
    HX_DELETE(m_pDescGenerator);
    HX_RELEASE(m_pCCF);
    HX_RELEASE(m_pContext);
}

HX_RESULT
CSDPStreamDescription::Update()
{
    IHXPlayer* pPlayer = NULL;
    if (HXR_OK == m_pContext->QueryInterface(IID_IHXPlayer, (void**)&pPlayer))
    {            
        IHXUpgradeCollection* pUpgradeCollection = NULL;

        if (HXR_OK == pPlayer->QueryInterface(IID_IHXUpgradeCollection, 
                (void**)&pUpgradeCollection))
        {
            IHXBuffer* pBuf = NULL;
            m_pCCF->CreateInstance(CLSID_IHXBuffer, (void**)&pBuf);
            if (!pBuf)
            {
                HX_RELEASE(pUpgradeCollection);
                HX_RELEASE(pPlayer);                
                return HXR_OUTOFMEMORY;
            }
            pBuf->Set((const BYTE*)zm_pStreamDescriptionMimeType, 
                    strlen(zm_pStreamDescriptionMimeType) + 1);
            pUpgradeCollection->Add(eUT_Required, pBuf, 0, 0);
            HX_RELEASE(pBuf);
        }
        HX_RELEASE(pUpgradeCollection);    

    }
    HX_RELEASE(pPlayer);                

    return HXR_OK;
}

STDMETHODIMP
CSDPStreamDescription::GetValues(IHXBuffer* pDescription,
    REF(UINT16) nValues, REF(IHXValues**) pValueArray)
{
    HX_RESULT res = HXR_UNEXPECTED;

    if (m_pDescParser)
        res = m_pDescParser->Parse(pDescription, nValues, pValueArray);

    if (HXR_REQUEST_UPGRADE == res)
    {
        res = Update();
        if (HXR_OK == res)
            res = HXR_REQUEST_UPGRADE;
    }

    return res;
}

STDMETHODIMP
CSDPStreamDescription::GetDescription(UINT16 nValues, IHXValues** pValueArray,
    REF(IHXBuffer*) pDescription)
{
    HX_RESULT res = HXR_UNEXPECTED;

    if (m_pDescGenerator)
        res = m_pDescGenerator->Generate(nValues, pValueArray, pDescription);

    return res;
}

// *** IHXStreamDescriptionSettings methods ***

STDMETHODIMP
CSDPStreamDescription::SetOption(const char* pKey, IHXBuffer* pVal)
{
    if (pKey == NULL || pVal == NULL)
    {
        return HXR_POINTER;
    }
    const char* pszVal = (const char*)pVal->GetBuffer();
    if (pszVal == NULL || *(pszVal+pVal->GetSize()-1) != '\0')
    {
        return HXR_UNEXPECTED;
    }

    HX_RESULT pnr = HXR_FAIL;
    if ((strcasecmp(pKey, "UseOldEOL") == 0) && m_pDescGenerator)
    {
        if (strcasecmp(pszVal, "true") == 0)
        {
            m_pDescGenerator->SetUseOldEOL(TRUE);
            pnr = HXR_OK;
        }
        else if (strcasecmp(pszVal, "false") == 0)
        {
            m_pDescGenerator->SetUseOldEOL(FALSE);
            pnr = HXR_OK;
        }
    }
    else if (strcasecmp(pKey, "AbsoluteBaseURL") == 0)
    {
        if (*pszVal == '0')
        {
                m_pDescGenerator->SetUseAbsoluteURL(FALSE);
            pnr = HXR_OK;
        }
        else if  (*pszVal == '1')
        {
                m_pDescGenerator->SetUseAbsoluteURL(TRUE);
            pnr = HXR_OK;
        }
    }
    else if (strcasecmp(pKey, "SessionGUID") == 0)
    {
        if (*pszVal == '0')
        {
                m_pDescGenerator->SetUseSessionGUID(FALSE);
            pnr = HXR_OK;
        }
        else if  (*pszVal == '1')
        {
                m_pDescGenerator->SetUseSessionGUID(TRUE);
        }
    }
    // add new options here

    return pnr;
}

STDMETHODIMP
CSDPStreamDescription::GetOption(const char* pKey, REF(IHXBuffer*) pVal)
{
    if (pKey == NULL)
    {
        return HXR_POINTER;
    }
    if (m_pCCF == NULL)
    {
        return HXR_UNEXPECTED;
    }
    m_pCCF->CreateInstance(CLSID_IHXBuffer, (void**)&pVal);
    if (pVal == NULL)
    {
        return HXR_OUTOFMEMORY;
    }

    HX_RESULT pnr = HXR_FAIL;
    char* pszVal;
    if ((strcasecmp(pKey, "UseOldEOL") == 0) && m_pDescGenerator)
    {
        pVal->SetSize(5+1);
        pszVal = (char*)pVal->GetBuffer();
        strcpy(pszVal, (m_pDescGenerator->GetUseOldEOL()?"true":"false")); /* Flawfinder: ignore */
        pnr = HXR_OK;
    }
    else
    {
        BOOL bIsOptionSet = FALSE;

        if (strcasecmp(pKey, "AbsoluteBaseURL") == 0)
        {
            bIsOptionSet = m_pDescGenerator->GetUseAbsoluteURL();
            pnr = HXR_OK;
        }
        else if (strcasecmp(pKey, "SessionGUID") == 0)
        {
            bIsOptionSet = m_pDescGenerator->GetUseSessionGUID();
            pnr = HXR_OK;
        }

        if (HXR_OK == pnr)
        {
            pVal->SetSize(5+1);
            pszVal = (char*)pVal->GetBuffer();
            strcpy(pszVal, (bIsOptionSet ? "true":"false")); /* Flawfinder: ignore */
        }
    }

    if (pnr != HXR_OK)
    {
        HX_RELEASE(pVal);
    }

    return pnr;
}

// *** IHXRTPPayloadInfo methods ***

/************************************************************************
 *        Method:
 *            IHXRTPPayloadInfo::PayloadSupported
 *        Purpose:
 *            Returns TRUE if this payload type is handled by this interface
 */
 
BOOL
CSDPStreamDescription::IsPayloadSupported(UINT32 ulRTPPayloadType)
{
    // make sure it's not one of reserved/unassigned ones
    if (SDPIsStaticPayload(ulRTPPayloadType) &&
        SDPMapPayloadToEncodingName(ulRTPPayloadType))
    {
        return TRUE;        
    }

    return FALSE;
}

/************************************************************************
 *        Method:
 *            IHXRTPPayloadInfo::GetTimestampConversionFactors
 *        Purpose:
 *            Retrieves the RTP and RMA factors for RTP to RMA timestamp ratio.
 *      RTP->RMA is RTPTimestamp * RTPFactor / HXFactor
 *      RMA->RTP is HXTimestamp * HXFactor / RTPFactor
 *        
 *        Note: does not check if the payload type is supported
 */
 
STDMETHODIMP
CSDPStreamDescription::GetTimestampConversionFactors
(                                
    UINT32 ulRTPPayloadType,
    REF(UINT32) /*OUT*/ ulRTPFactor,
    REF(UINT32) /*OUT*/ ulHXFactor
)
{
    HX_ASSERT(IsPayloadSupported(ulRTPPayloadType));
    ulRTPFactor = SDPMapPayloadToRTPFactor(ulRTPPayloadType);
    ulHXFactor = SDPMapPayloadToRMAFactor(ulRTPPayloadType);
    return HXR_OK;
}

/************************************************************************
 *        Method:
 *            IHXRTPPayloadInfo::IsTimestampDeliverable
 *        Purpose:
 *            Returns TRUE if this payload type is timestamp deliverable
 */
 
BOOL
CSDPStreamDescription::IsTimestampDeliverable(UINT32 ulRTPPayloadType)
{
    HX_ASSERT(IsPayloadSupported(ulRTPPayloadType));
    return SDPIsTimestampDeliverable(ulRTPPayloadType);    
}