From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-2?Q?Lars_Hagstr=F6m?= Subject: Re: Creative Mp3+ USB and SPDIF passthrough Date: Tue, 11 Nov 2003 14:18:04 +0100 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3FB0E18C.7040309@update.uu.se> References: <3FB0C937.30401@update.uu.se> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Okay! Two responses, I'll try them as soon as I can! Lars Jaroslav Kysela wrote: > On Tue, 11 Nov 2003, [ISO-8859-1] Lars Hagström wrote: > > >>Hi, >> >>I've sent this mail once before, but since I've received no response I >>send it again (only this once, I wont keep spamming...). >> >>I've scoured the net, the alsa-user list and this mailing list for >>information about how to enable AC3/DTS passthrough on the S/PDIF >>connector on my new Creative Mp3+ USB box. >>The only thing I've been able to find is a vague reference saying >>something that spdif passthrough is not available in usb-audio. Is this >>the truth? If it is the truth, will it remain so forever, or is anyone >>working on it? >>If it is not true, what am I doing wrong? I can get regular stereo >>output on the digital out. I've got the box set to digital only, which >>I've worked out is a requirement in windows. I have tried playing stuff >>both with "aplay -Dspdif" (is this correct?) and with "mplayer -ac hwac3". > > > You have wrong tests. Get alsa-tools, compile ac3dec and try this command: > > ac3dec -Dhw:0,0 -C > > The volumes (probably PCM and Master) should be set to 0dB (you need > probably trial and error path to determine the good values), otherwise > the stream will be modified and the receiver will not understand. Simply, > you need bit-to-bit copy without any modification of outgoing samples. > > Anyway, it might be possible, that your receiver does rely on the > non-audio bit set in the s/pdif protocol. In this case, we cannot help you > until someone discover, how this settings can be applied to your hardware. > > Jaroslav > > ----- > Jaroslav Kysela > Linux Kernel Sound Maintainer > ALSA Project, SuSE Labs > > > ------------------------------------------------------- > This SF.Net email sponsored by: ApacheCon 2003, > 16-19 November in Las Vegas. Learn firsthand the latest > developments in Apache, PHP, Perl, XML, Java, MySQL, > WebDAV, and more! http://www.apachecon.com/ > _______________________________________________ > Alsa-devel mailing list > Alsa-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-devel ------------------------------------------------------- This SF.Net email sponsored by: ApacheCon 2003, 16-19 November in Las Vegas. Learn firsthand the latest developments in Apache, PHP, Perl, XML, Java, MySQL, WebDAV, and more! http://www.apachecon.com/