From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Muizelaar Subject: Re: Mono to stereo ? Date: Fri, 28 Mar 2003 11:21:04 -0500 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3E847670.8070006@rogers.com> References: <3E83BE0E.4070406@embedded.cl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Takashi Iwai Cc: Manuel Jander , alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Takashi Iwai wrote: >At Thu, 27 Mar 2003 23:14:22 -0400, >Manuel Jander wrote: > > >>...but, if you are doing mono playback, your sound driver has to setup >>your soundcard to playback on both channels the same mono channel. The >>Vortex >>driver (still not in the main branch) for example splits the mono signal >>on its internal >>mixer into 2 identical signals which are feed one into each CODEC channels. >> >> > >no, please don't do that. >in the ALSA, instead of the lowlevel driver, alsa-lib (and >oss-emulation module) will do this job. > In this case the card (not driver) is spliting the mono signal and sending it to both right and left channels of the codec. Thus channels_min should still be 1 because the card does actually support a single channel >the driver is supposed to inform exactly what it supports. >in this case, both channels_min and channels_max will be 2. >the difference of configuration will be absorbed by the plug-in of >alsa-lib and oss-emulation module. > > -Jeff ------------------------------------------------------- This SF.net email is sponsored by: The Definitive IT and Networking Event. Be There! NetWorld+Interop Las Vegas 2003 -- Register today! http://ads.sourceforge.net/cgi-bin/redirect.pl?keyn0001en