From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: spdif input, source synchronous? Date: Thu, 24 Jan 2013 12:49:43 +0100 Message-ID: <51011FD7.5020405@ladisch.de> References: <50A17AEC.2080102@radagast.org> <1B9FEF259F5D4B4F83CD1C9FF0CF0FDB@mediascore.mediascore.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from out5-smtp.messagingengine.com (out5-smtp.messagingengine.com [66.111.4.29]) by alsa0.perex.cz (Postfix) with ESMTP id 5ACFF261696 for ; Thu, 24 Jan 2013 12:49:45 +0100 (CET) In-Reply-To: <1B9FEF259F5D4B4F83CD1C9FF0CF0FDB@mediascore.mediascore.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Rafal Powierski Cc: alsa-devel@alsa-project.org, Dave Platt List-Id: alsa-devel@alsa-project.org Rafal Powierski wrote: > ... ALC886 SPDIF input. > The test results show that the input is not "source synchronous" > > It seams that my HDA clock is a bit slower then definition ( about -10ppm) > Therefore resampling starts below -10ppm > It probably means that when spdif signal is 0ppm, about 10ppm of samples are missing. And real S/PDIF inputs probably are all over the map ... > Is this a bug? or it is planed like this? The HDA specification describes source synchronous streams, but does not mandate them. Apparently, the ALC886 does not support source synchronous streams. A quick Google search shows only the WM8850 (which also has a real sample rate converter). Regards, Clemens