From mboxrd@z Thu Jan 1 00:00:00 1970 From: Olaf Hering Subject: Re: snd-powermac produces only low quality dirty so Date: Wed, 15 Dec 2004 19:56:28 +0100 Message-ID: <20041215185628.GA3556@suse.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Return-path: Received: from Cantor.suse.de (news.suse.de [195.135.220.2]) by alsa.alsa-project.org (ALSA's E-mail Delivery System) with ESMTP id 8791824F for ; Wed, 15 Dec 2004 19:56:29 +0100 (MET) Content-Disposition: inline In-Reply-To: Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: danny@mailmij.org Cc: Giuliano Pochini , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On Wed, Dec 15, danny@mailmij.org wrote: > On Wed, 15 Dec 2004, Giuliano Pochini wrote: > > > > > On 14-Dec-2004 Olaf Hering wrote: > > > > > All 2.6 versions I tried so far produce only "dirty" low quality sound > > > when playing mp3 with xmms with either the alsa or oss plugin. > > > But it works as expected when I use dmasound_pmac and the liboss plugin. > > > > > > Any ideas how to debug it? > > > > It seems that the chip is not happy with some period/buffer sizes. > > Someone was trying to find the right constraints to set for those > > parameters. Maybe the attached patch fixes it (untested). > > > O yes, I forgot to send it. Will do later tonight. It doesn't have to be a > power of 2 though, at least not on my Snapper. > However, the problem never occured with oss emulation, so I doubt above > problem is the same. Low quality sound was happening a few versions ago, > but latest ALSA produces very reasonable sound, only distortion when > I turn up PCM too much (and DRC Range is set high). You are right, reducing the volume to 80% in xmms fixes it and the mp3 sounds ok. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/