From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([69.77.167.62] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Jkiey-0002Ow-Sh for garchives@archives.gentoo.org; Sat, 12 Apr 2008 16:33:01 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id B87D3E03CC; Sat, 12 Apr 2008 16:32:59 +0000 (UTC) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by pigeon.gentoo.org (Postfix) with ESMTP id 53BBEE03D8 for ; Sat, 12 Apr 2008 16:32:59 +0000 (UTC) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1Jkiew-0002zd-T2 for gentoo-amd64@lists.gentoo.org; Sat, 12 Apr 2008 16:32:58 +0000 Received: from ip68-230-99-4.ph.ph.cox.net ([68.230.99.4]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 12 Apr 2008 16:32:58 +0000 Received: from 1i5t5.duncan by ip68-230-99-4.ph.ph.cox.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 12 Apr 2008 16:32:58 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: gentoo-amd64@lists.gentoo.org From: Duncan <1i5t5.duncan@cox.net> Subject: [gentoo-amd64] Re: sudden sound loss Date: Sat, 12 Apr 2008 16:32:43 +0000 (UTC) Message-ID: References: <47FDFD4E.1050301@ercbroadband.org> <47FE44FC.1040905@ercbroadband.org> <5bdc1c8b0804101010l7cc95e16x44eaf3a95fa17d97@mail.gmail.com> <47FE4C4F.4030100@ercbroadband.org> <5bdc1c8b0804101043pdfacaeep2d6793d11ceac10@mail.gmail.com> <5bdc1c8b0804101245t45d95992kd1397694c99e6d8@mail.gmail.com> <47FF489F.6000007@ercbroadband.org> <1207913580.6155.26.camel@ws2912.agr.st.com> <5bdc1c8b0804110624y4458b711w3c83f640d1da317e@mail.gmail.com> <1207924415.6155.35.camel@ws2912.agr.st.com> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-amd64@lists.gentoo.org Reply-to: gentoo-amd64@lists.gentoo.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: ip68-230-99-4.ph.ph.cox.net User-Agent: Pan/0.132 (Waxed in Black) Sender: news Content-Transfer-Encoding: quoted-printable X-Archives-Salt: 131f7f67-0034-4bba-8b08-2222a22aef5a X-Archives-Hash: 42a01fa41743b5a200b7da42b79bd065 Raffaele BELARDI posted 1207924415.6155.35.camel@ws2912.agr.st.com, excerpted below, on Fri, 11 Apr 2008 16:33:35 +0200: > Actually it's the ADC/DAC that performs the mixing (the AD1986A in this > case). I checked the chip specs, it supports spreading 2ch over 6ch so > probably the feature is not yet supported by ALSA. Also some search in > the Gentoo forums confirm this > (http://forums.gentoo.org/viewtopic-t-414308-postdays-0-postorder-asc- start-25.html) In parallel with the other reply (which I was going to reply to but hit=20 the wrong key and deleted instead, sorry) suggesting jack, AFAIK, ALSA=20 does have software mixing for this sort of thing as well, but it involves= =20 rather "deeper magic" with the various plugins than I've ventured into,=20 myself. It's apparently extremely flexible -- if you know how to setup=20 the plugins in the right order, output of one into the input of the next,= =20 etc. =20 There ought to be documentation out there for it and I've always been=20 going to look into it, but then I got a 5.1 Onkyo amp and now just use=20 its surround mixing and send the standard two-channel out the digital PCM= =20 out on the computer, via the coax, to the digital PCM coax input on the=20 Onkyo. I figure it's about the same anyway, since the source I'm playing= =20 is two-channel stereo to begin with. Except, if I really knew what I was= =20 doing, doing it in software on the computer side would probably give me=20 rather more flexibility, but doing it on the Onkyo has been "good=20 enough", and offloads those extra CPU cycles compared to doing it in=20 software on the computer, as well. BTW, the going opinion (at least the going opinion on /. whenever a=20 computer audio article comes up, however you judge /that/ opinion) is=20 that it's basically impossible to get good quality on-computer sound no=20 matter /what/ board you have in the computer, simply because there's too=20 much electrical noise in there. Not that it's going to matter on say 128= =20 kbps MP3s or cheap computer speakers anyway, but for good recording or=20 decent quality source and playback over a decent system, the=20 recommendation is to NOT do the DAC in-computer, but either use digital- out (even on the built-in sound) and an external amp (as I'm doing now),=20 or one of those USB or firewire based soundcards, thus getting the DAC=20 out of the computer case and into its own somewhat more electrically=20 isolated environment. --=20 Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman --=20 gentoo-amd64@lists.gentoo.org mailing list