[MPlayer-dev-eng] [PATCH] AltiVec support for MPEG2

[Magnus Damm]

Hi,

Here's a patch that adds AltiVec support for MPEG2 videos.
The motion compensation code is stolen from libmpeg2 on sourceforge, 
but I did not get the IDCT code to work properly, so I took that code 
from vlc. Cred to the original authors.

Below is a table that lists some DVD:s and their CPU usage.
The first percentage without parenthesis is with the patch applied, and 
the last percentage is without the patch.
The test machine is a Cube G4 450MHz, Rage 128 video (xv), USB speakers
(alsa drivers, but OSS emulation).

Performance:

Austin Powers   720x480  (aspect 3)  29.97 fps  10002.0 kbps (1250.2 kbyte/s) -> 60-80% (90-100+%)
Bullitt         720x576  (aspect 3)  25.00 fps  9375.0 kbps (1171.9 kbyte/s)  -> 90-100% (100+%)
Matrix          720x480  (aspect 3)  29.97 fps  9375.0 kbps (1171.9 kbyte/s)  -> 60-90% (100+%)
Pulp Fiction    720x576  (aspect 3)  25.00 fps  12225.0 kbps (1528.1 kbyte/s) -> 80-100+% (100+%) 
Black Adder 4,1 720x576  (aspect 2)  25.00 fps  11250.0 kbps (1406.2 kbyte/s) -> 95-100+% (100+%)

/ magnus
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