[FFmpeg-devel] [PATCH] Implement recusive avfilter_get_video_buffer()

[Stefano Sabatini]

Hi all,

as thoroughly discussed in the "libavfilter-soc: implement pad
filter":

http://thread.gmane.org/20091003160337.GO2768 at MichaelsNB

attached patch *against the main SVN repo*, implements support to
recursive get_video_buffer() requests.

This allows a filter to request a buffer which is allocated by the
get_video_buffer() of a filter next in the filterchain.

This changes puts the base for making it possible possible direct
rendering (in the case the buffer is allocated for example by a sink
at the end of the chain, which requests a buffer directly to the
display system / the graphic GPU).

Also this makes possible to implement a memcpy-less pad filter, as the
buffer request is processed through all the filterchain, so the
dimensions of the requested buffer may change when recurring the
get_video_buffer() invokation from one filter to the next one.

I'm also providing the already proposed patch for some regression
tests (to directly apply to the soc repo), and a patch to update the
current filters in the soc repo, and the pad filter I implemented
based on this patch, which *is not supposed to be reviewed in this
thread*.

Regards.
-- 
FFmpeg = Fantastic and Fundamental Mastodontic Ponderous Ecumenical God
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