On Fri, Mar 20, 2015 at 04:06:56PM +0800, 周晓勇 wrote: > Dear Michael, > > > Hi, ffmpeg and mplayer have achieved huge performance improvement on x86 > under your leadership. And MIPS corporation have contributed the > optimizations on their chips, which mainly aiming at audio codecs. As we > know, ffmpeg and mplayer began to support loongson as a branch of mipsel from > about version n0.6.x, but without assembly optimization. In 2009 and 2011, we > taped out Loongson-3A and Loongson-3B. Loongson-3 series have the same core > with Loongson-2E and Loongson-2F named GS464, which also added multimedia > extension instructs but more powerful. > > > From last year, we began to optimize the H.264 and MPEG1/2/4 codecs based > on ffmpeg-0.10.x, and achieved about 70%~80% boost with H.264 decode, about > 30% boost with MPEG4 decode and 130% boost with RV40 decode(the xls data > attached in the accessory). The rough test was done on Loongson-3A,
thats great
> and we are very pleased to present some machines to the community for testing
> and verifying. Just send me your address.
ok, ill send you my address seperately, unless someone else volunteers
>
>
> In this year, we will release Loongson Fedora19 based on the community,
> and I have finished parts of optimization for n2.1.7. By contrast, the decode
> boost(VC+VO+A) come up with 170% for H264-720P(one is calvc, the other one is
> cabac), 78% for H264-1080P(two cabac), 59% for RV40, and 70% for MPEG4. The
> optimization mainly include libavcodec, libavutil, and mplayer's fast_memcpy.
>
>
> Now, for questions.
> 1.Our optimization based on n2.1.7, would you like me to send you the
> n2.1.7-patches or patches on master?
please submit patches against master
> 2.Same question for mplayer patches based on SVN-r37150.
mplayer patches too should be on the latest checkout not some
release
> 3.Could we use the suffix of "mmi" for the optimized function? For
> instance below, does ARM have registered "mmi" like Intel does for "MMX"?
> -----------------------------------------------------------------------
> av_cold void ff_h264dsp_init_loongson(...){
> ...
> c->h264_idct_dc_add = ff_h264_idct_dc_add_8_mmi;
> ...
> }
> -----------------------------------------------------------------------
you can use any suffix that is appropriate
Thanks
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
He who knows, does not speak. He who speaks, does not know. -- Lao Tsu
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