On Thursday 21 November 2002 18:09, Benny Sjostrand wrote: > Thanks, that explication makes sense. > > If it was that simple that Santa Cruz where the only card in the world with > this problem, but there's the same problem is reported for other cs46xx > based card's > too. > > >well, how did it work before (0.9.0rc1 worked for sure, I guess I should > > try to identify the specific version that developed this problem)? Were > > we using the DSP to invert it previosly, did we lose some Santa Cruz > > specific bittwiddling (the 'fix' consists of just negating all the levels > > for one stereo channel). Any guesses? > > I would like know why the problem does not apear with rc1, but the > problem does not > apear forme with any release, so I cant reproduce the problem with my > equipment, which > dont make things easy ...
no, that would be annoying indeed :-) > The main diference between the old DSP code and the new is that the old DSP > is based on a static parameter setup. The new DSP code is a attempt to > manage > tasks and resources in the DSP dynamically. > > I dont find any reason to why the DSP would invert one of the channels, > in theory > the parameter setup made when playing one PCM channel is the same as it is > in the old DSP code static loaded (discarding unknown bugs) > > Finally, the "volume" could be possible, speculating: if the output sample > is the product of volume * sample, and the volume is negative the sample > would > be negated. The "volume" in a DSP SCB for each channel is 16 bit value > where 0x8000 is the maximum volume and 0xffff is cero, and lower then > 0x8000 dont know. This part now actually differs a little bit from the old > static DSP setup. > Have you tested my latest patch ?? no, I haven't, since the patch is quite mangled in the www archive and I wasn't subscribed then, I didn't go through th trouble of fixing it up. Is it merged into cvs now, and if not, could you send it my way? I'd be happy to give it a shot. > >Just as another question, do anyone know if it's possible to use the > > internal SPDIF connector to feed CD audio into the card instead of the > > analog input? I can't find anything in the mixer that seems to recieve > > that input. > > The cs4630 chip got only one SDPIF input interface, you should see it > the mixer with > the new DSP code. And if that interface is wired to the internal SPDIF > conector without > any GPIO story it should just work (however the sounds gets > distorcionated (out-of-sync) > sometimes with the SPDIF input) ... Hmm, OK. Guess I'll reboot to windows and see if that connection even works there :-P Maybe I just screwed it up. > /Benny oh, for anybody using this http://ophelia.student.iastate.edu/~puetzk/arts_phaseinvert-0.7.tgz fixing yet another silly glitch Weijia found. (This is an aRts effect filter which introduces a phase inversion between the channels on purpose, which either fixes or introduces the problem, depending on whether you had it already). ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
