From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: Jonathan Woithe <jwoithe@just42.net>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, clemens@ladisch.de,
ffado-devel@lists.sf.net,
Takashi Sakamoto <o-takashi@sakamocchi.jp>
Subject: Re: [PATCH 0/5] ALSA: firewire-tascam: add MIDI functionality
Date: Wed, 14 Oct 2015 00:20:51 +0200 [thread overview]
Message-ID: <20151014002051.4fa8b0fa@kant> (raw)
In-Reply-To: <20151013100228.GA16452@marvin.atrad.com.au>
On Oct 13 Jonathan Woithe wrote:
> for cases like MOTU, where mixer control setting updates
> are pushed to the computer by the device in response to front panel actions,
> there will be a need for userspace to somehow tap into this flow. Userspace
> could not gain access to the iso stream because the kernel will have control
> over that. Or can userspace tap into iso streams that have been initiated
> by the kernel (that is surprising to me if it's true).
Indeed we do not have support for multiple local listeners on the same
stream. (firewire-core supports multiple listeners for FCP reception, but
this is a simpler case in several respects.)
I guess getting MOTU status out to userspace could work by having the
audio driver extract the data from the stream and push it as a new type of
event of the <sound/firewire.h> API through the ALSA hwdep interface.
(Apologies for going somewhat offtopic.)
--
Stefan Richter
-=====-===== =-=- -==-=
http://arcgraph.de/sr/
next prev parent reply other threads:[~2015-10-13 22:20 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 10:10 [PATCH 0/5] ALSA: firewire-tascam: add MIDI functionality Takashi Sakamoto
2015-10-12 10:10 ` [PATCH 1/5] ALSA: firewire-tascam: add support for incoming MIDI messages by asynchronous transaction Takashi Sakamoto
2015-10-12 10:10 ` [PATCH 2/5] ALSA: firewire-tascam: add support for outgoing " Takashi Sakamoto
2015-10-12 10:10 ` [PATCH 3/5] ALSA: firewire-tascam: add support for MIDI functionality Takashi Sakamoto
2015-10-12 10:10 ` [PATCH 4/5] ALSA: firewire-tascam: Turn on/off FireWire LED Takashi Sakamoto
2015-10-12 10:10 ` [PATCH 5/5] ALSA: firewire-tascam: change device probing processing Takashi Sakamoto
2015-10-12 12:42 ` Stefan Richter
2015-10-13 14:12 ` Takashi Sakamoto
2015-10-12 12:21 ` [PATCH 0/5] ALSA: firewire-tascam: add MIDI functionality Takashi Iwai
2015-10-12 12:48 ` Stefan Richter
2015-10-12 22:20 ` Jonathan Woithe
2015-10-13 9:36 ` Takashi Sakamoto
2015-10-13 10:02 ` Jonathan Woithe
2015-10-13 22:20 ` Stefan Richter [this message]
2015-10-19 14:21 ` Takashi Sakamoto
2015-10-19 23:45 ` Jonathan Woithe
2015-10-13 14:15 ` Stefan Richter
2015-10-19 14:13 ` Takashi Sakamoto
2015-10-19 23:36 ` Jonathan Woithe
2015-10-20 0:50 ` Takashi Sakamoto
2015-10-20 2:09 ` Takashi Sakamoto
2015-10-20 2:57 ` Jonathan Woithe
2015-10-20 2:52 ` Jonathan Woithe
2015-10-20 7:39 ` Stefan Richter
2015-10-26 15:18 ` Takashi Sakamoto
2015-10-27 1:38 ` Stefan Richter
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