Re: Movie Rendering in Direct3D

• Previous message: Rich [Microsoft Direct3D MVP]: "Re: Grainy"
• In reply to: Jack Hoxley: "Re: Movie Rendering in Direct3D"
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Date: Tue, 29 Jun 2004 09:17:33 -0700

"Jack Hoxley" <Jack.Hoxley@DirectX4VB.Com> wrote in message
news:OqdILXdXEHA.3292@TK2MSFTNGP09.phx.gbl...
> Thanks Philip,
>
> > methinks you doth exaggerate.
>
> Probably, when I posted it'd been a long, bad, day.
>
> I've walked through the entire sample - written it out on paper, had no
> problems with that. I've got something fairly similar to what you wrote
out.
>
> My problems came as soon as I tried to change the way the code was
> structured and integrate it with what I already have in the engine.
>
> Basically, we only need trivial rendering of movies -
>
> LoadMovie( std::string& )
> UnloadMovie( )
> PlayMovie( )
> PauseMovie( )
> StopMovie( )
>
> Anything else should be hidden behind that as mere implementation
details -
> and not for the use of anyone else.
>
> I'm still trying to work on some of these problems - but here's a rough
list
> of what's been going wrong:
> 1. The .lib (strmbase.lib I think) caused no end of LNK2005 errors
> (duplicate symbols).

did you rebuild the base classes, as described in the DShow docs?

> 2. The copying of the movie frames was upside down (yet I copy-pasted the
> DoRenderSample code!)

I seem to recall there is a field that tells if the movie bits are upside
down, biHeight. does the sample play your movie data upside down?

modifying the sample to have a file select dialog would be a good step...as
it would allow you to do more thorough testing of the sample to find its
limitations.

search on biHeight.

> 3. I'd get only the first few seconds of playback before the image was
lost
> (audio continued). This just intermittently happened - different times
each
> test.

does the sample do this too?

> 4. Crashing when trying to ->Release() the 'CTextureRenderer' based
> interface (as is done with the original sample). It threw an unknown
> exception (one not derived from std::exception).

must be some pointer still in use. does the debug runtime show any output?

> 5. Problems with namespaces - for whatever reasong the CComPtr<> class
won't
> work inside my namespaces, so I had to re-write some of the QueryInterface
> code.

Rich could comment better on that one.

>
> I know that all 5 of those points are my errors - simply because the
sample
> obviously works, and my code doesn't. Even though it is a near enough 1:1
> mapping copy. I'm also not that experienced with down-and-dirty COM
> programming - I quite like to avoid it really ;-)
>
> My frustration mostly came from the fact that the sample has no SDK
> documentation (unless its been removed by the latest Beta release I have)
> that helps with implementing it, and the sample is very poorly commented -
> nothing much above the obvious. So unless I know DShow inside out, and/or
> COM then I'm a bit stuffed...
>
> Compared with the unbelievably excellent Direct3D coverage in the SDK I
came
> to expect a little better.

yes, DShow is a little trickier and no one has gone thru the docs like I did
with the D3D docs. still, read up on filters, and managing filter graphs.
starting with the player sample, checking out the interfaces it uses,
searching on those in the docs to see what topics turn up, etc is the only
way to go. yes it will take a little time, but you will get there.

>
> Anyway, Sorry for all the ranting/waffle. I'll have another crack at the
> code after I get some more coffee.
> Best Regards,
> Jack
>
>
>
> "Philip Taylor [ATI]" <ptaylor@online.newsgroup-poster.ati.com> wrote in
> message news:ez29URUXEHA.2544@TK2MSFTNGP10.phx.gbl...
> > methinks you doth exaggerate.
> >
> > its not that hard to walk thru the code in the Texture3D sample.
> >
> > here is what it does.
> >
> > WinMain
> > InitD3D
> > InitGeometry
> > Set up a timer for rendering ( may not be ideal for all apps )
> > MessageLoop
> > Kill the timer
> > Cleanup
> >
> > MessageLoop
> > Dispatch to WndProc, so examine WM_PAINT, WM_TIMER
> > WM_PAINT, WM_TIMER
> > Render
> >
> > so at the top level there are 3 main methods to learn, InitD3D,
> > InitGeometry, and Render. Cleanup I will leave as an exercise for the
> > reader.
> >
> > InitD3D - in textures.cpp
> > sets up the D3D objects ( d3d, d3ddevice, sets some renderstates )
> >
> > InitGeometry
> > InitDShowTextureRenderer
> > create a vertex buffer
> > fill the vertex buffer with the grid the texture is rendered onto
> >
> > Render
> > some housekeeping to recover from device lost
> > Clear
> > BeginScene
> > SetupMatrices
> > ( only world matrix needs to be set every time in this app, but
> > useful in cut-n-paste into another app )
> > SetTexture ( to our video texture )
> > Render the vertexbuffer
> > ( only DrawPrim needs to be called every time in this app, but
> > SetStreamSource and SetVertexShader useful in cut-n-paste into another
> app )
> > EndScene
> > Present
> > CheckMovieStatus, to see if movie needs to be restarted
> >
> > now we understand InitDShowTextureRenderer and CheckMovieStatus, DShow
> > specific helpers
> >
> > InitDShowTextureRenderer - in dshowtextures.cpp
> > creates the filtergraph
> > creates the texture renderer ( CTextureRenderer, local class )
> > gets a pointer to the base filter from the texture renderer filter,
> add
> > it to the graph
> > loads the media
> > adds the source filter to the graph
> > have the graph builder render the source filters output
> > filter graph manager will connect the video stream to the loaded
> > texture renderer
> > thats standard filter graph stuff, eg in->filter->out
> > get some housekeeping interfaces ( media control, event, position )
> > start the graph running
> >
> > CheckMovieStatus
> > uses the event interface to check for completion
> > if completed, set position to start
> >
> > so now we need to understand CTextureRenderer
> >
> > constructor
> > should AddRef the texture, doesnt do that so thats a possible bug
> >
> > destructor
> > de nada, eg do nothing
> > should Release the texture to match the AddRef
> >
> > CheckMediaType
> > reject if not video type
> > only accept RGB24 in ( to make it easier for format conversion )
> >
> > SetMediaType
> > get info in size of media
> > create a D3DX texture using D3DXCreateTexture
> > make sure it returned what we expected
> > save format info
> >
> > DoRenderSample
> > verify incoming data pointer and outgoing texture pointer are okay
> > get the video buffer pointer
> > lock the texture
> > copy the bits
> > for 2 formats ( X8R8G8B8 and A1R5G5B5, with format conversion )
> > unlock texture
> >
> > thats it in a nutshell, really, was that hard?
> >
> > you have to explain what part you dont get.
> >
> > If you want to understand DShow, filtergraphs, etc so that you can
change
> > the apps behavior in using video - you have no choice but to learn
DShow.
> > There is quite extensive documentation in the SDK. Start with the player
> > samples.
> >
> > If this is all you want to do, you can consider the job done.
> >
> >
> > "Jack Hoxley" <Jack.Hoxley@DirectX4VB.Com> wrote in message
> > news:O3snhBTXEHA.1164@tk2msftngp13.phx.gbl...
> > > Hello all,
> > >
> > > I know I'm a newbie here - usually stick to other places, but given my
> > level
> > > of desperation I gathered (after the beta-dx newsgroups) this was the
> best
> > > place to look for answers... :-)
> > >
> > > Anyway, any of you who know of the DirectShow 'Texture3D' (and
> > 'Texture3D9')
> > > sample might be able to help. I need to emulate it's features in our
> > > graphics engine.
> > >
> > > Basically, we have a 2D GUI style menu system for the game - and I
need
> to
> > > be able to display a movie from a file (.avi, .mpg etc..) in with the
> GUI.
> > > It must interact with Direct3D, because there can be other elements
> > > on-screen (so its not quite a classical cut-scene problem).
> > >
> > > Anyway, I'm getting close to thinking it's just not possible. I've not
> > found
> > > any substantial documentation on the DShow API, and only re-hashings
of
> > that
> > > one SDK sample (so no other working code to go from). No one I've
asked,
> > > even Microsoft, seems to have anything to help :-(
> > >
> > > Does anyone know of any tutorials/guides/samples for getting a movie
> from
> > a
> > > file onto a texture? My knowledge of movie playback (and the various
> > > WM-SDK/DShow etc.. libraries) is a bit limited - this is my first
major
> > > collision with the stuff!
> > >
> > > The Texture3D9 sample is a complete mess - COM objects everywhere,
> global
> > > variables, random classes - making it extremely difficult to
comprehend
> > and
> > > re-write for my project structure.
> > >
> > > In fact, if theres anyone here who understands aforementioned sample
and
> > > would be willing to give me a hand working out what it does...
> > >
> > > I know I'm asking a lot, but any help is soooooo greatly appreciated
> right
> > > now!
> > > Regards,
> > > Jack
> > >
> > >
> >
> >
>
>

• Previous message: Rich [Microsoft Direct3D MVP]: "Re: Grainy"
• In reply to: Jack Hoxley: "Re: Movie Rendering in Direct3D"
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