From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?St=E9phane_BERTHELOT?= Subject: Re: MCP7A HDMI passthrough audio Linux/ALSA Date: Fri, 03 Jul 2009 20:07:09 +0200 Message-ID: <4A4E48CD.9010802@emisfr.com> References: <4A4A01CF.9090203@emisfr.com> <4A4A0D45.7030501@emisfr.com> <4A4A7AB7.6050103@emisfr.com> <4A4B29D7.5070805@emisfr.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Received: from smith2.emisfr.net (smith2.emisfr.net [88.191.81.87]) by alsa0.perex.cz (Postfix) with ESMTP id 365E3103950 for ; Fri, 3 Jul 2009 20:07:11 +0200 (CEST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Takashi Iwai Cc: wni@nvidia.com, alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org Takashi Iwai a =E9crit : > At Wed, 01 Jul 2009 11:18:15 +0200, > St=E9phane BERTHELOT wrote: > = >> Takashi Iwai a =E9crit : >> >> At Tue, 30 Jun 2009 22:51:03 +0200, >> Stephane BERTHELOT wrote: >> >> Hm, so apparently your TV doesn't accept non-audio format? >> But TV accepted the ac3dec output with -R option, right? >> (Make sure this -- otherwise ac3dec might have decoded by itself.) >> = >> Basically, -R means to send the encoded an AC3 stream (packed in the >> SPDIF format) without setting non-audio bit. Whether non-audio bit = is >> 1 or 0 is the only difference between -C and -R. So, if -R really >> works but not -C, it means that the non-audio bit must be off no >> matter what you send. Weird. >> >> I'm sure the TV only accepted -R and not -C (or -P) with the same ac3 fi= le. >> But I'm confused since I was quite sure -R would *decode* ac3 to PCM and= then >> send it in LPCM format. >> = > > Ah, yes, of course. That's logical, then, that -R works. > > Hm, then it's an issue of receiver side? > Can Windows send the raw AC3 and TV decodes it properly? > > > Takashi > > > = Thanks you Takashi, After investigating on the Windows side (damn!) I finally found that = with the latest Nvidia official HDMI audio out drivers I was also = receiving only stereo PCM. I'm very angry against Sharp since their TV set outputs AC3 when = switched on DVB tuner mode, it even offer "digital audio out settings" = on analog inputs (scart / component /...) but strangely this menu is no = more available when on an HDMI channel. I'm very upset about this, since this TV set is about 6 months old seems = already deprecated. I'm trying to get someone at Sharp service to make an upgrade to get = digital audio through HDMI to the optical output but I have little hope = about this. I still can't figure why they do that, is it a digital = entertainment system or not ? My old frist-gen dvd player does better ... Thanks anyway for your help and if you can give me some hints about how = to convince Sharp to make an upgrade for this I will be welcome. I'm = pretty sure some other users have had the same kind of problems... I now need either to buy an USB audio card with SPDIF out (or in/out) or = an HDMI switch (some have spdif out) or even a real new HD Audio Amp, = but this is getting more and more expensive ... Thanks a lot Takashi, and I hope I'll find a 'not so expensive' solution = for this. (If anyone can give me pointer on cheap USB or HMDI hardware = ... :) ) Stephane.