From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <200008041305.OAA01797@hyperion.valhalla.net> Date: Fri, 04 Aug 2000 14:05:11 +0100 Subject: Re: CDDA playback on Pismo (and other newer models) From: "Iain Sandoe" To: Benjamin Herrenschmidt , Henry Worth , linuxppc-dev@lists.linuxppc.org Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: [...] >>>From the the drive's spin-up sounds it seems to always be in >>high-speed mode, but unlike the ATAPI driver, there is little >>head movement noise. > > I think the problem is more with cdparanoia. I think it's more or less > synchronous, it doesn't have a thread that collects datas while another > outputs sounds. I've looked at cdparanoia sources some time ago, and I > think and intermediate step of buffering is necessary. >>From my IRQ latency measurements I would think that there was *no* chance without the intermediate step. On my Lombard, CD access over IDE can mask IRQs for 2 >>ms<<< which also means you need to make sure the audio frag sizes are sensible as well... i.e. don't try 2 frags of 256 bytes - it won't work as things stand. Iain. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/