[MPlayer-dev-eng] [PATCH] Fix vf_expand aspect when d_width != width

[Jason Tackaberry]

The attached patch fixes vf_expand so that when specifying an aspect
ratio, it accounts for hardware scaling (or, more accurately, when
d_width != width) so that the final display resolution is the
user-specified aspect ratio.

For example, I have a movie with a frame size of 704x368 and an aspect
ratio of 2.271, so that the display size would be 836x368.  Without this
patch, specifying -vf expand=:::::4/3 would cause a frame size of
704x528 and a display size of 836x528 (because 704/(4/3) = 528), which
is not the aspect given (1.583 != 1.333).  With this patch, the expand
height takes into account the display aspect, so the expanded frame size
is 704x627 and display size of 836x627 (which is 4/3).

Cheers,
Jason.
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