From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Gabriel M. Beddingfield" Subject: caiaq driver: audio 4 dj and jackd Date: Sun, 01 Dec 2013 19:02:27 -0800 Message-ID: <529BF843.6000608@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pd0-f178.google.com (mail-pd0-f178.google.com [209.85.192.178]) by alsa0.perex.cz (Postfix) with ESMTP id A043B26165F for ; Mon, 2 Dec 2013 04:02:36 +0100 (CET) Received: by mail-pd0-f178.google.com with SMTP id y10so16952774pdj.23 for ; Sun, 01 Dec 2013 19:02:35 -0800 (PST) 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: Alsa-devel , Daniel Mack , Antonio Ospite List-Id: alsa-devel@alsa-project.org Is it possible to make all 4 ins/outs in the Audio 4 DJ available through the first substream device? A user was having trouble using the NI Audio 4 DJ device with jackd. When jack connected, this 4-in/4-out device would appear as 2-in/2-out. This was the result of the fact that the channels are split up into stereo substreams. I.e. the first two channels are found in hw:x,0,0 and the last two channels are in hw:x,0,1. The work-around was to use the `multi' plug-in to make these 2 PCM's appear as a single PCM. There's several situations where this is a Good Thing, because it makes it easy for the user to treat the streams independently. BUT... in the pro-audio case this is not a good thing at all. Ideally, substream 0 would support 1, 2, or 4 channels (for both playback and capture). When substream 0 is using more than 2 channels, then substream 1 would return EBUSY when in use. So... would it be possible to do this in the caiaq driver? -gabriel