[MPlayer-dev-eng] Fast OpenGL playback

[Matt Heler]

Iam intrested. Send it please.


On Sunday 07 November 2004 6:01 pm, Stephen Webb wrote:
> Hello to everyone.  I have written some code that may be useful / of
> interest to the dev team.  I figured I would post on the list to see if
> anyone wants it.
>
> What I wanted was to be able to use MPEG-2 decoded frames as textures in
> OpenGL (just like everyone else, it seems).  Since I needed all the speed
> I could get, I hacked the vo_gl.c file to better take advantage of my
> hardware, and was able to (appx.) double the performance compared to the
> "normal" vo_gl.c stuff.
>
> I'm new to Mplayer, so maybe this has been done ten times already, or
> maybe it's seen as too hardware-specific to be included.  My apologies if
> I'm repeating old information. (I did scan the archives and didn't find a
> whole lot of discussion on this topic)
>
> Anyway, the two main things I did were to get rid of the software YUV to
> RGB conversion, and to use nVidia's PDR support for fast texSubImage2D
> calls.  The YUV conversion was done using Cg, so it needs extra libraries
> and headers, and the PDR uses extensions that aren't in the standard OGL
> headers.  (I use the GLEW extension management stuff)
>
> The bottom line:
> 1024x768 @ 1375 KBytes/sec MPEG-2 on a P4 2.4 GHz w/ GFFX5950:
>
> 300 frames, with the -benchmark option
>
> -vo X11:     5.4 sec
> -vo gl2:     6.85 sec
> -vo gl :    ~7 sec
> -vo dga:     4.7 sec
> -vo vesa:   ~3.7 sec
> -vo gl_hack: 3.7 sec
>
> Getting rid of the YUV to RGB conversion is obviously a big help (it
> happens on the card in parallel...), but the AGP accelerated texSubImage
> shouldn't be overlooked either. It saved about 1.4 seconds (~800 MB/sec
> transfer vs. ~120 MB/sec).
>
> For comparison, on a FX5200 it is actually slower to do the conversion on
> the card (but I haven't necessarily optimized the fragment program).
>
> Anyway, if anyone is interested in the code let me know.
>
> Thanks
>
> -Steve
>
>
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