From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Iwai Subject: Re: About 'SNDRV_PCM_CLASS_MULTI' for devices with multi-channels Date: Thu, 20 Feb 2014 09:02:18 +0100 Message-ID: References: <5304C64D.3090400@sakamocchi.jp> <530508BB.6060802@canonical.com> <53056860.7090500@sakamocchi.jp> Mime-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mx2.suse.de (cantor2.suse.de [195.135.220.15]) by alsa0.perex.cz (Postfix) with ESMTP id 32FDB2610CE for ; Thu, 20 Feb 2014 09:02:19 +0100 (CET) In-Reply-To: <53056860.7090500@sakamocchi.jp> 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: Takashi Sakamoto Cc: alsa-devel@alsa-project.org, David Henningsson List-Id: alsa-devel@alsa-project.org At Thu, 20 Feb 2014 11:28:48 +0900, Takashi Sakamoto wrote: > > Hi David, > (My message was not delivered by ALSA's mailman...) Because you posted from an address that isn't subscribed. It takes time until manually approved. > Again all, > > >> I have two questions about the usage of this macro. > >> > >> Should I use this macro for new drivers which I'm working for?' > >> > http://mailman.alsa-project.org/pipermail/alsa-devel/2014-January/071820.html > >> > >> > >> My drivers support some firewire devices, which is desinged for > >> studio-use and have many channels. Its combination of channels are not > >> designed for surround sound like 5.1ch. > >> > >> Just judging from its name, 'SNDRV_PCM_CLASS_MULTI', I should use this. > >> But there are no drivers which use this macro in current tree, against > >> my expectation that some drivers (ICE1712-pro, RME9652, 6fire usb and so > >> on) should use this macro. > >> > >> Are there any reasons? > > In current tree, there are no drivers which uses this macro. > > As long as I investigated in ftp server, this macro is firstly added in > ALSA 0.9.0beta1 (2001/02/21). So this macro has been ignored over 10 > years... Right. And the likely reason is that such a differentiation doesn't help much. You can still use your device for driving 5.1 surround :) So, I rather would like to keep them RIP. Maybe worth to remove it now. Takashi