[Ffmpeg-cvslog] CVS: ffmpeg/libavcodec/ppc dsputil_h264_template_altivec.c, 1.3, 1.4

[Diego Biurrun]

On Wed, Feb 22, 2006 at 11:07:37AM +0100, Michael Niedermayer wrote:
> 
> On Tue, Feb 21, 2006 at 11:24:22PM +0100, Diego Biurrun CVS wrote:
> > 
> > Modified Files:
> > 	dsputil_h264_template_altivec.c 
> > Log Message:
> > Fix AltiVec H.264 decoding on FSF gcc.
> > patch by Luca Barbatom, lu_zero aatt gentoo ddoott org
> 
> hmm, this needs to be benchmarked (on a gcc which didnt misscompile it of
> course) as it adds several instructions

I don't have such a gcc, but here are some rough benchmarks with MPlayer
on my system, all services stopped, X still running, best out of 4 runs
printed below.

mplayer -benchmark -nosound -vo null ~/samples/H264/cathedral-beta2-400extra-crop-avc.mp4

before:
BENCHMARKs: VC:  85.231s VO:   0.058s A:   0.000s Sys:   4.856s = 90.145s
BENCHMARK%: VC: 94.5488% VO:  0.0641% A:  0.0000% Sys:  5.3871% = 100.0000%

after:
BENCHMARKs: VC:  85.065s VO:   0.061s A:   0.000s Sys:   4.786s = 89.912s
BENCHMARK%: VC: 94.6090% VO:  0.0676% A:  0.0000% Sys:  5.3234% = 100.0000%

mplayer -benchmark -nosound -vo null ~/samples/H264/NeroAVC.mp4

before:
BENCHMARKs: VC:  15.037s VO:   0.005s A:   0.000s Sys:   0.467s = 15.509s
BENCHMARK%: VC: 96.9553% VO:  0.0331% A:  0.0000% Sys:  3.0116% = 100.0000%

after:
BENCHMARKs: VC:  15.057s VO:   0.005s A:   0.000s Sys:   0.464s = 15.526s
BENCHMARK%: VC: 96.9791% VO:  0.0345% A:  0.0000% Sys:  2.9864% = 100.0000%

Inconclusive I would say.  But well worth the fixed decoding ;)

Michael, IIRC you said you don't trust MPlayer's benchmark code, how
would I enable the start/stop timer thing that FFmpeg has?

Diego