On Fri, 06 Jun 2008 18:49:28 +0200 Takashi Iwai <tiwai@xxxxxxx> wrote: > At Fri, 6 Jun 2008 11:52:32 -0300, > Mauro Carvalho Chehab wrote: > > > > On Thu, 29 May 2008 16:20:21 +0200 > > Takashi Iwai <tiwai@xxxxxxx> wrote: > > > > > At Thu, 29 May 2008 11:10:22 -0300, > > > Mauro Carvalho Chehab wrote: > > > > > > > > ATI SB4x0 doesn't need any fix at position. > > > > > > It's not about the position fixing but whether to use the > > > position-buffer. The devices on the blacklist are the ones that have > > > no position buffer. So, it would fall into LPIB mode, and this list > > > avoids it from the beginning. > > > > > > > This patch solves the issue of receiving several clicks during capture on those > > > > devices. > > > > > > > > Tested with a Gateway Notebook MX-6453. > > > > > > The click noise is often a different problem. Did you already try > > > the patch below? > > > > The click seems associated to some residual samples inside the buffer. Here it > > is a sample of the king of click noise I'm hearing here (captured from CD input entry): > > http://linuxtv.org/~mchehab/snd.ogg > > (I didn't check the ogg file yet, and just a wild guess) > > Is it with dsnoop plugin? With "default" PCM, ALSA uses dsnoop for > capture to allow multiplexing for HD-audio. Does it happen with "hw" > or "plughw" PCM? Results with the cdplay: With "default" PCM (both with and without mmap): several clicks per second, very high clicks; (like a very risky analog disk) With "hw" or "plughw" (no mmap): less clicks (something like two clicks or three per second), with less volume. both hw and plughw produces the same effect. With "hw" or "plughw" and mmap (-M): high quality. no noticeable clicks. So, it seems that there are two different issues: one with dsnoop and another with non-mmapped captures. Cheers, Mauro _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
