On Wednesday 29 July 2009 15:16:20 Lennart Poettering wrote: > On Wed, 29.07.09 12:33, Michal Hlavinka (mhlavink@xxxxxxxxxx) wrote: > > > This reminds me your note: > > > > > > > > > https://tango.0pointer.de/pipermail/pulseaudio-discuss/2009-July/004519 > > >.htm l > > > > > > PA does not make use of hardware mixing. And I don't plan to change > > > that. It's obsolete technology. CPUs these days come with > > > extensions such as MMX or SSE precisely for speeding up DSP tasks such > > > as PCM mixing. This is way more flexible that hw mixing, and definitely > > > the way to the future, both on the desktop and on embedded envs as > > > well. > > > > > > > > > The "obsolete technology" -- who made this decision? Is it your private > > > opinion or any suggestion from sound card manufacturers? > > > > > > It seems that HW companies still produce the "obsolete technology". > > > > First, I like pulseaudio, especially the ability of moving streams from > > one sink to another is awesome for laptops with external sound card :o) > > > > But imo hw mixer (or other hw parts) are not that bad... we still have hw > > accelerated graphic, math,... why not sound? Also this remains me that > > pulseaudio eats 24 % of my (1.6GHz) cpu when mapping stereo stream to 5.1 > > which (I suppose) some hw mixer could do while letting cpu free for other > > tasks. > > If PA eats a lot of CPU this can have many reasons, most of them have > to do with the latency settings requested by the applications or that > have been configured due to frequent underruns. However the actual > mixing is certainly the smallest part of it. Plese don't forget that > mixing is not exactly the most complex operation on earth. Well... I'm pretty sure I have no idea how it works :D I've just noticed that when playing stereo and sound card (Aureon MK II) is configured for stereo, it eats about 4 % and (when speakers are set as 5.1) only front speakers work (as expected), when I configure that card for 5.1 output and play stereo stream it goes to all 5.1 speakers and eats about 24 % of cpu -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
