[FFmpeg-devel] [PATCH] HWAccel infrastructure (take 7.1)

Vitor Sessak vitor1001
Tue Feb 24 22:26:59 CET 2009

Reimar Do"ffinger wrote:
> On Tue, Feb 24, 2009 at 09:42:22PM +0100, Gwenole Beauchesne wrote:
>>> Well, IMO while it needs little changes that patch takes the
>>> "move the mess one step higher" approach.
>>> One particular disadvantage of that approach is that e.g. you can't  
>>> see
>>> if it would still be possible to "misuse" libswscale to convert  
>>> between
>>> VDPAU- and YV12-format without API changes.
>> I don't see how it was possible in "current" (in SVN) code either.
> Hm? Of course it was not implemented, but what necessary _information_
> would be missing for swscale to do such a conversion?
>>> There are also other questions like if it can cause any issues that
>>> AVFrame + PIX_FMT is no longer sufficient to interpret the data
>>> (obviously this can be solved e.g. by added a codec identifier to
>>> vdpau_render_state).
>> This would be an interesting addition at the API level too. I also  
>> have VDP_CODEC_MPEG2 et al. identifiers in my code and the fact you  
>> need something similar is also a sign this could be a good addition to  
>> the API. But back to your question, do you have an example please? I  
>> don't quite understand your case. Thanks.
> I don't have anything specific in mind, but what does e.g. libavfilter
> use? Does it have access to codec_id/AVCodecContext? Not that I know
> what libavfilter would do with compressed data...

With compressed data, I can only think of changing timestamps...


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