[vorbis-dev] SIMD instructions
mpxplay at freemail.hu
Wed Feb 5 16:04:43 PST 2003
These were my observations only...
maybe they are not match with yours...
I'll check again my optimizations, but I think so (I hope)
I haven't missed anything (or the bug is in my ear).
And everybody likes to follow his own way and
fortunately Vorbis is opensource (thank You for it).
If I modify float(s) to double(s) in
vorbis_lsp_to_curve() : p and q local variables
and mdct.c/mdct.h : REG_TYPE
I get more high sounds at playing beta3/beta4 files.
But it's true that Vorbis 1.0 (RCx) routines are not so
precision sensitive (only the mdct part).
I attach my decoder-side-only Ogg Vorbis library (removed
all encoder-side functions to reduce code size (190k->55k))
There are some asm routines and a lot of x86 specific code,
but maybe some routines/optimizations are usefull in
your official/original code too (ie: codebook.c, floor1.c).
Check it, and if you think, use it, if you don't think,
don't use it. :)
But keep up the good work!
btw. When will we get new Vorbis encoder?
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 53822 bytes
Url : http://lists.xiph.org/pipermail/vorbis-dev/attachments/20030206/a63ee326/ogg_mpx-0001.bin
More information about the Vorbis-dev