From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: snd-usb-audio syncronisation problem Date: Tue, 26 Feb 2008 15:21:45 +0100 Message-ID: <47C42079.2030102@ladisch.de> References: <43e8c7320802220151p177d2c73y2c9724a4cb4743ef@mail.gmail.com> <47C2B822.7000507@ladisch.de> <43e8c7320802251032j7541ac02t1459ef83d95dfd4e@mail.gmail.com> <47C3C07B.2040104@ladisch.de> <43e8c7320802252353p2798488at87163c75a4511c4f@mail.gmail.com> <47C3CA77.5070104@ladisch.de> <43e8c7320802260038x17c2c350wade07dcd4f32cb3e@mail.gmail.com> <47C3D29B.9070708@ladisch.de> <43e8c7320802260120u241d2c83r97d7e00d4896992c@mail.gmail.com> <47C3F9BF.3080600@ladisch.de> <43e8c7320802260453m45c55ba5gb1756e288bf90808@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from out3.smtp.messagingengine.com (out3.smtp.messagingengine.com [66.111.4.27]) by alsa0.perex.cz (Postfix) with ESMTP id 3AEBA24357 for ; Tue, 26 Feb 2008 15:20:04 +0100 (CET) In-Reply-To: <43e8c7320802260453m45c55ba5gb1756e288bf90808@mail.gmail.com> 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: Adrian Stancu Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Adrian Stancu wrote: > I see, you say that the device knows what sample rate it is supposed > to use, and that this rate should be automatically used. Not automatically, the driver sets an alternate setting in set_format() by calling usb_set_interface(). > ... > 2) I logically connect the device to the virtual machine, set the > sampling rate to 96k through the creative supplied drivers, Apparently, that driver uses some vendor-specific request to configure the device. To find out what exactly that driver does, you'd have to use a tool like usbsnoop to record the USB requests. Regards, Clemens