From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: Have multiple opens removed on one device? Date: Mon, 22 Aug 2011 12:21:43 +0100 Message-ID: <20110822112143.GB9232@opensource.wolfsonmicro.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from opensource2.wolfsonmicro.com (opensource.wolfsonmicro.com [80.75.67.52]) by alsa0.perex.cz (Postfix) with ESMTP id 41C3110386D for ; Mon, 22 Aug 2011 13:21:48 +0200 (CEST) Content-Disposition: inline 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: Takashi Iwai Cc: Scott Jiang , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On Mon, Aug 22, 2011 at 12:15:58PM +0200, Takashi Iwai wrote: > Scott Jiang wrote: > > In kernel 2.6.34 I can use aplay to play audio at the same time, alsa > > will mix the audio. > No, kernel part doesn't do such a thing. If it's mixed, it must be > in the user-space (either dmix or a daemon like pulseaudio), unless > you hardware can do mixing by itself. There *are* some cards (mostly older ones like emu10k) that support multiple streams transparently but this has never been supported in ASoC due a lack of hardware that can do it.