developing my own windows media server for live devices [WiredBox.Net

> My question is, what are the programmatic steps i need to
> have an encoded stream with a buffer i can read from and
> submit to connected clients? Which interfaces do i need
> and do i need a file at the end or can i just give
> econded data to TCP packets? the last part gets me
> confused.

> From: "Lehel"
>
> > My question is, what are the programmatic steps i need to
> > have an encoded stream with a buffer i can read from and
> > submit to connected clients? Which interfaces do i need
> > and do i need a file at the end or can i just give
> > econded data to TCP packets? the last part gets me
> > confused.
>
> capture -> compress -> mux -> send/write
>
> If WindowsMedia is OK, the WMWriter (or the WMASFWriter
> filter in DirectShow) will perform compression, muxing,
> network sending and/or file writing. The supported network
> protocol is MMS-over-HTTP and (I think) the maximum number
> of clients is 50. If you want a better streaming protocol or
> unlimited clients, you will need to reflect the stream with
> WindowsMediaServices on Windows Server or write your own
> protocol implementation.
>
> --
> // Alessandro Angeli
> // MVP :: DirectShow / MediaFoundation
> // mvpnews at riseoftheants dot com
> //http://www.riseoftheants.com/mmx/faq.htm

> left is if i need some metadata file like an asx file to
> point to my stream server? i'm assuming if i want a
> windows media player to connect to it, i'd need some file
> like that.

> From: "Lehel"
>
> > left is if i need some metadata file like an asx file to
> > point to my stream server? i'm assuming if i want a
> > windows media player to connect to it, i'd need some file
> > like that.
>
> No, you don't. WMP connects to the URL that corresponds to
> the streaming server. You can either give WMP the URL
> directly or you can (but don't have to) put it in an ASX
> file and tell WMP to read the URL from there.
>
> > if that's the case, how would i specify the
> > metadata?
>
> An ASX file is just a text file with an XML-like syntax that
> you can easily write yourself. The syntax is documented in
> the WMP SDK (also included in the Windows SDK and the
> on-line and off-line MSDN Library):
>
> http://msdn.microsoft.com/en-us/library/bb248407(VS.85).aspx
>
> MS also provides an unsupported library to create ASX files:
>
> http://support.microsoft.com/kb/933491
>
> --
> // Alessandro Angeli
> // MVP :: DirectShow / MediaFoundation
> // mvpnews at riseoftheants dot com
> //http://www.riseoftheants.com/mmx/faq.htm

> First, I experimented with GraphEdit to test out the
> ASFWriter filter for DirectShow. The writer creates an

> From: "Lehel"
>
> > First, I experimented with GraphEdit to test out the
> > ASFWriter filter for DirectShow. The writer creates an
>
> [...]
>
> The WMASFWriter filter is not designed to work in GraphEdit,
> because you can not configure it.
>
> You might want to read this older thread for details that
> shouls answer all of your previous questions:
>
> http://groups.google.com/group/microsoft.public.win32.programmer.dire...
>
> As an alternative to the stock WMASFWriter, you can also use
> my own ASF sink (Q20 in my FAQ, link at the bottom). You
> will have to remove some of the code that forces the
> WMWriter object to work as a muxer only.
>
> > My last question has to do with the filters in GraphEdit.
> > I tried simply to make a graph using my video and audio
> > capture filters and connecting them directly to the
> > ASFWriter which failed. I then tried adding a video and
> > audio compressor filters, respectively, but when I did
> > this, graphedit inserted a decoder right after my decoder
> > and then into the asf writer. is the
> > capture->encoder->decoder->asf_writer really necessary?
>
> No, it's not. As I said, the WMASFWriter can not be used in
> GraphEdit because you can not configure it and you need to
> configure it with the right profile to successfully connect
> to it.
>
> http://msdn.microsoft.com/en-us/library/aa384809(VS.85).aspx
>
> --
> // Alessandro Angeli
> // MVP :: DirectShow / MediaFoundation
> // mvpnews at riseoftheants dot com
> //http://www.riseoftheants.com/mmx/faq.htm

> btw, would you know offhand why I get an E_FAIL when i query for the
> advanced writer from the IServiceProvider?
>
> here is my test code:
>
> HRESULT hr = 0;
> hr = ::CoInitialize(NULL);
> // Create the graph builder and the filtergraph
> hr = pCaptureGraphBuilder.CoCreateInstance
> ( CLSID_CaptureGraphBuilder2 );
> hr = pGraph.CoCreateInstance( CLSID_FilterGraph );
> hr = pCaptureGraphBuilder->SetFiltergraph( pGraph );
> hr = pDevEnum.CoCreateInstance(CLSID_SystemDeviceEnum);
>
> // Query all the interfaces needed later
> hr = pGraph.QueryInterface( &pMediaControl );
> hr = pGraph.QueryInterface( &pMediaEvent );
> hr = pGraph.QueryInterface( &pMediaSeeking );
>
> // Initialize the video capture filter
> pVideoCap.Attach( GetFirstInputDriver(Video));
> hr = pGraph->AddFilter( pVideoCap, L"Video capture source" );
>
> // Initialize the audio capture filter
> pAudioCaptureFilter.Attach(GetFirstInputDriver(Audio));
> hr = pGraph->AddFilter( pAudioCaptureFilter, L"Audio Capture
> Filter" );
>
> // Initialize the Video DMO Wrapper
> hr = pVideoEncoder.CoCreateInstance( CLSID_DMOWrapperFilter );
> hr = pVideoEncoder.QueryInterface( &pVideoWrapperFilter );
>
> // Load the WMV9 encoder in the DMO Wrapper.
> // To encode in MPEG, replace CLSID_CWMV9EncMediaObject with the
> // CLSID of your DMOCLSID_CWMV9EncMediaObject
>
> hr = pVideoWrapperFilter->Init(__uuidof(CWMV9EncMediaObject), //
> CLSID_CWMV9EncMediaObject,
> DMOCATEGORY_VIDEO_ENCODER );
> hr = pGraph->AddFilter( pVideoEncoder, L"WMV9 DMO Encoder" );
>
> // Load ASF multiplexer.
> // To create a MPEG file, change the CLSID_ASFWriter into the GUID
> // of your multiplexer
> hr = pAsfWriter.CoCreateInstance( CLSID_WMAsfWriter );
> IFileSinkFilter* fileSink;
> hr = pAsfWriter->QueryInterface( IID_IFileSinkFilter, (void**)
> &fileSink );
> pFileSinkFilter.Attach(fileSink);
> hr = pFileSinkFilter->SetFileName(L"C:\\test0.asf", NULL);
>
> IWMWriterNetworkSink* pNetSink = NULL;
> hr = ::WMCreateWriterNetworkSink(&pNetSink);
> pNetworkSink.Attach(pNetSink);
> DWORD port = 2727;
> hr = pNetworkSink->Open(&port);
>
> IServiceProvider* prov = NULL;
> hr = pAsfWriter->QueryInterface(IID_IServiceProvider, (void**)&prov);
> pProvider.Attach(prov);
> IWMWriterAdvanced2* writer = NULL;
>
> //THIS RETURNS E_FAIL
> hr = pProvider->QueryService
> (IID_IWMWriterAdvanced2,IID_IWMWriterAdvanced2, (void**)&writer);
> pWriterAdvanced.Attach(writer);
>
> On Nov 21, 1:51 pm, "Alessandro Angeli" <nob...[ at ]nowhere.in.the.net>
> wrote:
>
> > From: "Lehel"
>
> > > First, I experimented with GraphEdit to test out the
> > > ASFWriter filter for DirectShow. The writer creates an
>
> > [...]
>
> > The WMASFWriter filter is not designed to work in GraphEdit,
> > because you can not configure it.
>
> > You might want to read this older thread for details that
> > shouls answer all of your previous questions:
>
> >http://groups.google.com/group/microsoft.public.win32.programmer.dire...
>
> > As an alternative to the stock WMASFWriter, you can also use
> > my own ASF sink (Q20 in my FAQ, link at the bottom). You
> > will have to remove some of the code that forces the
> > WMWriter object to work as a muxer only.
>
> > > My last question has to do with the filters in GraphEdit.
> > > I tried simply to make a graph using my video and audio
> > > capture filters and connecting them directly to the
> > > ASFWriter which failed. I then tried adding a video and
> > > audio compressor filters, respectively, but when I did
> > > this, graphedit inserted a decoder right after my decoder
> > > and then into the asf writer. is the
> > > capture->encoder->decoder->asf_writer really necessary?
>
> > No, it's not. As I said, the WMASFWriter can not be used in
> > GraphEdit because you can not configure it and you need to
> > configure it with the right profile to successfully connect
> > to it.
>
> >http://msdn.microsoft.com/en-us/library/aa384809(VS.85).aspx
>
> > --
> > // Alessandro Angeli
> > // MVP :: DirectShow / MediaFoundation
> > // mvpnews at riseoftheants dot com
> > //http://www.riseoftheants.com/mmx/faq.htm