[MPlayer-dev-eng] Re: using pthreads with mplayer

[Michael Niedermayer]

Hi

On Tuesday 05 July 2005 17:32, Oded Shimon wrote:
> On Tue, Jul 05, 2005 at 05:19:14PM -0100, Andrea Palmat? wrote:
> > At 13:37 05/07/2005, you wrote:
> > >lol, there are no pthreads in MPlayer, at all. Disregarding -cache,
> > > MPlayer is a completely single-threaded program. You're possibly
> > > thinking of MPlayerXP, which is a threaded version of MPlayer. The way
> > > it works is by making threads to decode the picture, and a single
> > > thread which each time shows a new frame on the VO. Whether this speeds
> > > this up or not is debatable, but not here.
> >
> > Strange because i've found in the config.h i've found:
> >
> > /* Define this if your system has pthreads */
> > #define HAVE_PTHREADS 1
> >
> > and in config.mak
> >
> > HAVE_PTHREADS = yes
> >
> > searching thru the code i've found a pthread.c (in libavcodec) that is
> > compiled on my system. so it is useless?
>
> In MPlayer, yes. I was gonna mention it, then figured no point. Since
> libavcodec is a general library, it works for other programs, and some
> programs use it's threads feature for _encoding_ (afaik, it can't do
> threaded decoding, atleast not within the library). 

it can for mpeg1/2, if the video has been encoded with multiple slices, (mpeg2 
always uses slices)
it should also be easy to add support for this to mplayer but only SMP systems 
would benefit and they probably are already fast enough to decode most mpeg2 
streams around ...

[...]
-- 
Michael