Hi, Sorry, looks like I overlooked this post... At Wed, 01 Nov 2006 17:58:55 +0100, Erik Slagter wrote: > > Sorry if this is considered to be "user" question, but I got no response > at all from the "user" list. Guess the real cracks hang around here. > > I have lots of questions I cannot resolve from all of the docs, but for > the moment I'll stick to the most important one. > > The combination of HDA/ALC882 should be able to deliver sound at 96 kHz > (hda..., right...) Also the ALC882 datasheet says it can deliver sound > at 96 kHz. > > In practise, though, I cannot get it to output any other sample rate > than 48 kHz. Any other sample rate handed to hw:0,0 is simply converted > (somewhere??? and badly...) to 48 kHz and the SPDIF is still driven at > 48 kHz. > > iecset allows me to set the rate to 32/44.1/48 kHz, the spdif output is > still at 48 kHz. Some other flags from iecset are actually honoured > (like "data" and "emphasis"). It's simply because iecset program doesn't support the rates over 48kHz. But the hda-intel driver supports the rate, AFAIK. (At least, there is no particular code that restricts over-48kHz.) One thing to be noted is that if you use "hw" PCM device, you have to set up the SPDIF status bits _manually_ via control API. If you use "iec958" or "spdif" PCM device, you can pass these bits as optional arguments at opening the PCM. > I can ask aplay to play at various rates (from a suitable PCM file), but > it complains at any other rate than 44.1 or 48 (notably 32) kHz that the > rate is not supported. It plays at 44.1 kHz though. And again converts > it to 48 kHz! Sigh... Who complains? At least, the driver won't. > Maybe I am using the wrong "hw", there is also a "hw:0,2" device, which > I cannot make work properly at all (only one channel is output, large > chunks are discarded, much much clipping). The first PCM device is for the multi-output PCM. It's for both analog and digital. The dedicated SPDIF is the secondary one. Takashi ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
