[MPlayer-dev-eng] [RFC] Split out hwaccel code

[Roberto Togni]

Hi,
 this is a proposed patch to split the hwaccel code out of vd_ffmpeg,
and put it into its own driver (vd_ffhw, but better names are welcome).


The main purpose of this is to be able to change vd_ffmpeg code without
the risk of breaking hwaccel (difficult to test if you don't have the
hardware); at the same time it allows to work on hwaccel in a small and
clean decoder, without all the special cases needed for the many
formats supported by vd_ffmpeg.

This also permit to use hwaccel by passing only "-vfm ffhw -vo vdpau"
on the commandline, without specifying the codec (now you have to use
"-vo vdpau -vc xxxvdpau"). If you add -vfm ffhw and the codec is not
supported by hwaccel, MPlayer will fall back to vd_ffmpeg.
The current syntax with -vc is also supported, so backward
compatibility is guaranteed.


The code is tested only with h264 and vaapi over vdpau; xvmc and other
vdpau formats are untested.


Hopefully this should accelerate the addition of more hwaccel formats
(eg. vaapi), and ease the work on buffer management in vd_ffmpeg (today
dr1 mostly fails).


Please comment.

Ciao,
 Roberto
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