From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: TWL4030 low-latency Date: Mon, 17 Oct 2011 13:23:47 +0200 Message-ID: <4E9C1043.6050804@ladisch.de> References: <7C8103E9-A683-4FCA-9E55-9D81A3CA3439@ccrma.Stanford.EDU> 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 C2F5F103892 for ; Mon, 17 Oct 2011 13:23:23 +0200 (CEST) In-Reply-To: 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: "Ujfalusi, Peter" Cc: Edgar Berdahl , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Ujfalusi, Peter wrote: > BTW: PA also have 'real time' mode which basically means that it is > using the kernel scheduling > for audio timing. That mode isn't called 'real time' and has nothing to do with real time. It just uses the kernel timer instead of the sound card clock so that it can be woken up in irregular intervals. This mode doesn't work so well if the sound card doesn't allow to read the current sample position precisely (many embedded DMA controllers have this problem). Regards, Clemens