Hi, Just out of interest, what sound card is causing this difficulty? Any chance you could try a different sound card?
Also, one thing I've found is that for some cards I have to specify the rate in asound.conf for them to work properly (particularly intel chipset based cards). Putting a rate 44100 or rate 48000 in asound.conf generally fixes playback issues that I've run into. > > > I sent this earlier to rivendell-prog but never got a reply. Perhaps it was > the holidays, or maybe that mailing list is deprecated? > > ---------- Forwarded message ---------- > From: Karl Koscher <[email protected]> > Date: Wed, Dec 25, 2013 at 2:11 AM > Subject: Fixing ALSA playback on weird cards > To: [email protected] > > > For whatever reason, one of our ALSA playback cards reports a sampling rate > of 44099 instead of the usual 44100. Any playback on this device quickly > gets distorted, and though some debugging, I found that a byte was being > dropped. The culprit is the code in FillAlsaOutputStream that adjusts the > amount of data it reads in if the card's playback rate is not the same as > the stream's. The amount of data to read is divided by the ratio between > the card's playback rate and the stream's rate. If the playback ringbuffer > is empty, this increases the amount of data to read beyond the capacity of > the ringbuffer. In that case, the ringbuffer code takes the first 2^18-1 > bytes, which causes the samples to become misaligned. > > I'm trying to figure out the purpose of this code. FillAlsaOutputStream > will always fill the ringbuffer, so the rate that it's filled doesn't need > to be adjusted. It could also be to do a form of poor resampling by > dropping samples periodically, but this only works if the playback rate is > lower than the stream's sample rate, and it doesn't do this resampling when > the ringbuffer is initially filled. Is there a reason for this code, or can > it be pulled out?<hr>_______________________________________________ > Rivendell-dev mailing list > [email protected] > http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev _______________________________________________ Rivendell-dev mailing list [email protected] http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev
