From: Clemens Ladisch <clemens@ladisch.de>
To: Patrick Lai <plai@codeaurora.org>
Cc: linux-arm-msm@vger.kernel.org, alsa-devel <alsa-devel@alsa-project.org>
Subject: Re: [alsa-devel] Compressed Audio Playback/Capture through ALSA framework
Date: Thu, 17 Mar 2011 08:39:33 +0100 [thread overview]
Message-ID: <4D81BAB5.5060204@ladisch.de> (raw)
In-Reply-To: <4D8134C6.30104@codeaurora.org>
Patrick Lai wrote:
> Where can I find user-space code snippet to see how ALSA is configured
> for IEC958 playback?
Use the ALSA device name "iec958" (or its alias "spdif").
For another than the default sound card, use "iec958:x".
For compressed formats, you have to set the non-audio bit.
Thise device has four parameters AES0..3 for the four bytes
of S/PDIF metainformation. The non-audio bit can be set by
adding the parameter "AES0=6"; the complete device name then
looks like "spdif:AES0=6" or "spdif:other=parameters,AES0=6"
or "spdif:{ other-parameters ... AES0=6 }".
The try_open_device function of mplayer tries to do this:
http://git.mplayerhq.hu/?p=mplayer;a=blob;hb=HEAD;f=libao2/ao_alsa.c
Regards,
Clemens
next prev parent reply other threads:[~2011-03-17 7:39 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-15 18:31 Compressed Audio Playback/Capture through ALSA framework Patrick Lai
2011-03-15 20:40 ` Eliot Blennerhassett
2011-03-15 20:52 ` [alsa-devel] " pl bossart
2011-03-15 23:28 ` Patrick Lai
2011-03-16 7:21 ` [alsa-devel] " Clemens Ladisch
2011-03-16 7:23 ` Jaroslav Kysela
2011-03-16 22:08 ` Patrick Lai
2011-03-17 7:39 ` Clemens Ladisch [this message]
2011-03-16 10:38 ` [alsa-devel] " Mark Brown
2011-03-16 10:59 ` Koul, Vinod
2011-03-16 11:56 ` Mark Brown
2011-03-16 12:17 ` Koul, Vinod
2011-03-16 17:52 ` pl bossart
2011-03-16 17:53 ` Mark Brown
2011-03-16 18:00 ` pl bossart
2011-03-16 18:08 ` Mark Brown
2011-03-17 2:21 ` Koul, Vinod
2011-03-17 5:00 ` Patrick Lai
2011-03-17 11:54 ` Mark Brown
2011-03-17 14:27 ` pl bossart
2011-03-17 18:25 ` Mark Brown
2011-03-17 19:16 ` [alsa-devel] " pl bossart
2011-03-17 20:16 ` Mark Brown
2011-03-17 21:19 ` Patrick Lai
2011-03-17 21:25 ` Mark Brown
2011-03-18 16:03 ` pl bossart
2011-03-22 13:01 ` Mark Brown
2011-03-17 5:32 ` Asus E35M1-M Pro and Realtek AL887-VD - no love from ALSA for Sourround Wojciech Myrda
2011-03-17 21:55 ` Paul Menzel
2011-03-20 10:13 ` Wojciech Myrda
2011-03-18 2:22 ` Compressed Audio Playback/Capture through ALSA framework Raymond Yau
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