From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: Support for USB-Audio devices with Multiple configurations? Date: Tue, 19 May 2009 09:15:46 +0200 Message-ID: <4A125CA2.7010806@ladisch.de> References: <4A0BBAF4.6000108@cse.unsw.edu.au> <4A0D14BD.1050002@ladisch.de> <4A0D2CC7.7000408@cse.unsw.edu.au> <4A0DA47E.1070607@ladisch.de> <4A111C9D.4010301@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from out1.smtp.messagingengine.com (out1.smtp.messagingengine.com [66.111.4.25]) by alsa0.perex.cz (Postfix) with ESMTP id D0E71103891 for ; Tue, 19 May 2009 09:15:50 +0200 (CEST) In-Reply-To: <4A111C9D.4010301@cse.unsw.edu.au> 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: Cameron Stone Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Cameron Stone wrote: > Clemens Ladisch wrote: > > Each alternate setting has its own set of descriptors; you can > > change _any_ parameter in those descriptors. > > Great, I've got this working now. > > However, how do I ask arecord to use a particular alternate setting? I'd > like to have two alternate settings with the same number of channels, > but different microphones enabled. Is that possible? This difference does not show up in the altsettings' descriptors, so the driver would not know which one to choose. This needs to be a mixer control (a selector unit). HTH Clemens