From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anoop Rajan Subject: Re: Support for Synchronous Audio Date: Fri, 17 Apr 2015 10:28:50 +0000 Message-ID: <1429266530143.46159@librewireless.com> References: <1429258074046.61439@librewireless.com>, <5530CD6E.4080408@ladisch.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from na01-bl2-obe.outbound.protection.outlook.com (mail-bl2on0125.outbound.protection.outlook.com [65.55.169.125]) by alsa0.perex.cz (Postfix) with ESMTP id 885B126053E for ; Fri, 17 Apr 2015 12:28:54 +0200 (CEST) In-Reply-To: <5530CD6E.4080408@ladisch.de> Content-Language: en-IN 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: Clemens Ladisch Cc: "alsa-devel@alsa-project.org" List-Id: alsa-devel@alsa-project.org Hi Clemens, As I told we support synchronous multiroom audio, where in one speaker(master) streams the audio to others nodes(slave) over the network. Master speaker future timestamps the audio and re-transmits to all other nodes based on a common reference clock maintained. Our stack implements the logic to present the audio synchronously to ALSA monitoring the stamped time.We are not using snd_pcm_link(). We use MT-7620 SOC from Mediatek. Thanks, Anoop ________________________________________ From: Clemens Ladisch Sent: 17 April 2015 14:37 To: Anoop Rajan; alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Support for Synchronous Audio Anoop Rajan wrote: > We have requirements to play synchronous multi-room audio with very > minimal node to node latency(<100 us). [...] Though I make sure that > I start the PCM from user layer synchronously How? With snd_pcm_link()? What hardware are you using? Regards, Clemens