[Openchrome-users] XvMC PutSlice

[Michael Weber]

On 10/3/06, Thomas Hellstr?m <thomas at tungstengraphics.com> wrote:
> Michael Weber wrote:
>
> >   I am looking into a decoding problem with XvMC, does the XvMC
> >PutSlice decode the slice immediately or does it delay until the
> >SyncSurface?
> >
> >mike
> >
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> It's a bit complicated.
>
> The slice is queued up in an internal buffer.
> If you are not using AGP DMA, that buffer is flushed at the end of
> PutSlice and the decoding starts.
> SyncSurface polls the engine to make sure it is completed.
>
> If you are using AGP DMA, the buffer is not flushed until it's full, or
> a call to FlushSurface(), and then it is flushed to the kernel AGP
> command queue, which might have other tasks to do before tending to the
> Slice data.
>
> To debug, I think you'd best turn off AGP DMA if you have it enabled.
>
> /Thomas
>
>

Right -- I saw the buffer for the AGP interface.  So for AGP mode,
does the last flush happen at the SyncSurface?  And for PCI mode
SyncSurface is basically a nop?

mike