From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Demian Martin" Subject: Problem with USB Class 2 Audio Driver Date: Fri, 20 Aug 2010 17:40:22 -0700 Message-ID: <054801cb40c9$70349710$509dc530$@com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from n19.bullet.mail.mud.yahoo.com (n19.bullet.mail.mud.yahoo.com [68.142.206.146]) by alsa0.perex.cz (Postfix) with SMTP id 599DC24366 for ; Sat, 21 Aug 2010 02:41:45 +0200 (CEST) Content-Language: en-us List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: 'Daniel Mack' , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Daniel: I'm testing an early sample of the Wavelength Wavelink, a USB to S/PDIF adapter that supports 44.1-192 KHz sample rates and uses async usb to talk to ALSA. It works and plays all of the sample rates correctly with the git version of Alsa from 7/30/2010 whenthe files are sourced from the network. However if I try to play from a usb source to the usb dac it doesn't work and the whole system gets unstable. The platforms I have tested it on seem to have a single USB host interface but with USB 2 there should be enough bandwidth to pass the data from a USB stick to the cpu and back. If I use an older 96 only usb dac on the same system it works (unless the down conversion isn't a direct divide, which overloads the CPU, but that is a different issue). The problem seems to be sample rate independent and hits the moment I try to access the file. This is using MPD as a player. What additional info do you need to troubleshoot this? Is it an intrinsic limitation to the interface? What additional tests should I do? It's possible it's a hardware issue but how do I divide them so I can go back to the hardware guy if it's his issue? Demian Martin Product Design Services