> > I'm facing another *£%@ problem. When period size is a multiple or > > submultiple of PAGE_SIZE, it works fine, but when it isn't, sound > > clicks, pops, repeapeapeats, skps :(( And since the period never crosses > > physically the page boundary because I split it when it happens, I can't > > imagine what's wrong. Perhaps some of you had the same problem. > > > > .period callback does this: > > do you mean pointer callback?
Yes, sorry. > > bufsize=substream->runtime->periods*substream->runtime->period_size; > > you already have substream->runtime->buffer_size for this. They are different: [aplay <no options> track.wav] Mar 19 19:21:23 localhost kernel: pcm_hw_params (bufsize=88200 periods=3 persize=22052) bufsize==88200 != 3*22052 == 66156 > > //addr==number of bytes transferred. > > pos=bytes_to_frames(substream->runtime, addr); > > return(pos%bufsize); > > i suppose addr is updated in the interrupt handler, right? No, I read it from the hardware every time. I tried to store the value in the irq handler and it's the same. > > > Here is a log of sg list construction: > > [...] > > the logs seem fine. > > did you set up page callback, too? Yes I did. > were the irqs issued correctly with the 1.5 page periods? > i mean, at the proper timing? Yes, I believe. When period size is 2048 or 1024 it works fine. I put a printk in the pointer callback to monitor the frame position and it always seems correct despite the bad output. "irq" is a command I insert in the sg list, because the hw don't generate it automatically at the and of each block. IMO the bug is around the .pointer callback function. > maybe it would be easier to debug if you show the actual code and the > hardware spec... I'm writing my driver around the open source generic driver released by the manufacturer (in C++ argh!). I'm trying to keep the generic code as-is to make upgrades to future releases easier. I don't have hw specs but the sources are full of comments. As far as I can see there are no hw limits about the size of the sg list and its entries. You can get my (very-ugly-pre-alpha) sources here: http://space.virgilio.it/[EMAIL PROTECTED]/ea.tgz and the generic driver here: http://www.echoaudio.com/Downloads/Developer/EchoGenericDriverA0.zip Bye. ------------------------------------------------------- This SF.net email is sponsored by: Does your code think in ink? You could win a Tablet PC. Get a free Tablet PC hat just for playing. What are you waiting for? http://ads.sourceforge.net/cgi-bin/redirect.pl?micr5043en _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
