sdprendr.cpp

linux下的一款播放器

// *** IHXRenderer methods ***

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::StartStream
//  Purpose:
//	Called by client engine to inform the renderer of the stream it
//	will be rendering. The stream interface can provide access to
//	its source or player. This method also provides access to the 
//	primary client controller interface.
//
STDMETHODIMP CSDPRenderer::StartStream
(
    IHXStream*	    pStream,
    IHXPlayer*	    pPlayer
)
{
    HX_RESULT			rc = HXR_OK;

    m_pStream  = pStream;
    m_pStream->AddRef();

    m_pPlayer  = pPlayer;
    m_pPlayer->AddRef();

    return rc;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::EndStream
//  Purpose:
//	Called by client engine to inform the renderer that the stream
//	is was rendering is closed.
//
STDMETHODIMP CSDPRenderer::EndStream()
{
    Cleanup();
    
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnHeader
//  Purpose:
//	Called by client engine when a header for this renderer is 
//	available. The header will arrive before any packets.
//
STDMETHODIMP CSDPRenderer::OnHeader(IHXValues* pHeader)
{    
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnPacket
//  Purpose:
//	Called by client engine when a packet for this renderer is 
//	due.
//
STDMETHODIMP CSDPRenderer::OnPacket(IHXPacket* pPacket, 
				    LONG32 lTimeOffset)
{
    HX_RESULT		rc = HXR_OK;

    HX_ASSERT(lTimeOffset <= 0);

    IHXBuffer* pBuffer = pPacket->GetBuffer();
    if(pBuffer)
    {
	rc = ProcessSDP(pBuffer);
    }
    HX_RELEASE(pBuffer);

    return rc;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnTimeSync
//  Purpose:
//	Called by client engine to inform the renderer of the current
//	time relative to the streams synchronized time-line. The 
//	renderer should use this time value to update its display or
//	render it's stream data accordingly.
//
STDMETHODIMP CSDPRenderer::OnTimeSync(ULONG32 ulTime)
{
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnPreSeek
//  Purpose:
//	Called by client engine to inform the renderer that a seek is
//	about to occur. The render is informed the last time for the 
//	stream's time line before the seek, as well as the first new
//	time for the stream's time line after the seek will be completed.
//
STDMETHODIMP CSDPRenderer::OnPreSeek(ULONG32 ulOldTime, ULONG32 ulNewTime)
{
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnPostSeek
//  Purpose:
//	Called by client engine to inform the renderer that a seek has
//	just occured. The render is informed the last time for the 
//	stream's time line before the seek, as well as the first new
//	time for the stream's time line after the seek.
//
STDMETHODIMP CSDPRenderer::OnPostSeek(ULONG32 ulOldTime, ULONG32 ulNewTime)
{
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnPause
//  Purpose:
//	Called by client engine to inform the renderer that a pause has
//	just occured. The render is informed the last time for the 
//	stream's time line before the pause.
//
STDMETHODIMP CSDPRenderer::OnPause(ULONG32 ulTime)
{
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnBegin
//  Purpose:
//	Called by client engine to inform the renderer that a begin or
//	resume has just occured. The render is informed the first time 
//	for the stream's time line after the resume.
//
STDMETHODIMP CSDPRenderer::OnBegin(ULONG32 ulTime)
{
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::OnBuffering
//  Purpose:
//	Called by client engine to inform the renderer that buffering
//	of data is occuring. The render is informed of the reason for
//	the buffering (start-up of stream, seek has occured, network
//	congestion, etc.), as well as percentage complete of the 
//	buffering process.
//
STDMETHODIMP CSDPRenderer::OnBuffering(ULONG32 ulFlags, UINT16 unPercentComplete)
{
    return HXR_OK;
}

/////////////////////////////////////////////////////////////////////////
//  Method:
//	IHXRenderer::GetDisplayType
//  Purpose:
//	Called by client engine to ask the renderer for it's preferred
//	display type. When layout information is not present, the 
//	renderer will be asked for it's prefered display type. Depending
//	on the display type a buffer of additional information may be 
//	needed. This buffer could contain information about preferred
//	window size.
//
STDMETHODIMP CSDPRenderer::GetDisplayType
(
    REF(HX_DISPLAY_TYPE)   ulFlags,
    REF(IHXBuffer*)	    pBuffer
)
{
    ulFlags = HX_DISPLAY_NONE;

    return HXR_OK;
}

/************************************************************************
 *	Method:
 *	    IHXRenderer::OnEndofPackets
 *	Purpose:
 *	    Called by client engine to inform the renderer that all the
 *	    packets have been delivered. However, if the user seeks before
 *	    EndStream() is called, renderer may start getting packets again
 *	    and the client engine will eventually call this function again.
 */
STDMETHODIMP CSDPRenderer::OnEndofPackets(void)
{
    return HXR_OK;
}

HX_RESULT
CSDPRenderer::ProcessSDP(IHXBuffer* pSDPBuffer)
{
    HX_RESULT           rc = HXR_OK;
    UINT32              ulSDPBufferSize = 0;
    char*               pszSDPBuffer = NULL;
    CHXString           escapedSDP;
    CHXString           url;
    CHXHeader*          pTrackProps = NULL;
    CHXBuffer*          pBuffer = NULL;
    IHXGroupManager*    pGroupManager = NULL;
    IHXGroup*           pGroup = NULL;

    if (!pSDPBuffer)
    {
        rc = HXR_FAILED;
        goto cleanup;
    }

    ulSDPBufferSize = pSDPBuffer->GetSize() + 1;

    pszSDPBuffer = new char[ulSDPBufferSize];
    if (NULL == pszSDPBuffer)
    {
        rc = HXR_OUTOFMEMORY;
        goto cleanup;
    }

    memset(pszSDPBuffer, 0, ulSDPBufferSize);
    strncpy(pszSDPBuffer, (const char*)pSDPBuffer->GetBuffer(), pSDPBuffer->GetSize());
    
    CHXURL::encodeURL(pszSDPBuffer, escapedSDP);

    url = HELIX_SDP_SCHEME;
    url += ":";
    url += escapedSDP;

    if (HXR_OK != m_pContext->QueryInterface(IID_IHXGroupManager, (void**)&pGroupManager))
    {
        rc = HXR_FAILED;
        goto cleanup;
    }

    pGroupManager->GetCurrentGroup(m_uGroupIndex);
    
    if (HXR_OK != pGroupManager->GetGroup(m_uGroupIndex, pGroup))
    {
        HX_ASSERT(FALSE);
        rc = HXR_FAILED;
        goto cleanup;
    }

    pTrackProps = new CHXHeader;
    pTrackProps->AddRef();

    pBuffer = new CHXBuffer();
    pBuffer->AddRef();

    pBuffer->Set((UCHAR*)(const char*)url, url.GetLength() + 1);
    pTrackProps->SetPropertyCString("src", pBuffer);

    pGroup->AddTrack(pTrackProps);

cleanup:

    HX_VECTOR_DELETE(pszSDPBuffer);

    HX_RELEASE(pGroup);
    HX_RELEASE(pGroupManager);
    HX_RELEASE(pBuffer);
    HX_RELEASE(pTrackProps);

    return rc;
}

void
CSDPRenderer::Cleanup(void)
{
    HX_RELEASE(m_pStream);
    HX_RELEASE(m_pPlayer);
    
    return;
}