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, and we are very
pleased to present some machines to the community for testing and verifying.
Just send me your address.
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?
2.Same question for mplayer patches based on SVN-r37150.
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;
...
}
-----------------------------------------------------------------------
Expect your reply. Yours sincerely,
Chris Zhou
---------------------------- ←(:з X∠)_
周晓勇 @系统研发部
Christian Zhou @System R & D
龙芯中科技术有限公司
Loongson Technology Corporation Limited
北京市海淀区温泉镇中关村环保科技示范园龙芯产业园2号楼
Loongson Industrial Park, building 2 , Zhongguancun Environmental protection
park,
Haidian District, Beijing, China
E@mail: zhouxiaoy...@loongson.cn
mplayer&ffmpeg-benchmark-Loongson3A.xls
Description: MS-Excel spreadsheet
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