From: Richard Cochran <richardcochran@gmail.com>
To: Henrik Austad <henrik@austad.us>
Cc: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
alsa-devel@vger.kernel.org, netdev@vger.kernel.org,
Arnd Bergmann <arnd@linaro.org>
Subject: Re: [very-RFC 0/8] TSN driver for the kernel
Date: Tue, 14 Jun 2016 20:26:15 +0200 [thread overview]
Message-ID: <20160614182615.GA2741@netboy> (raw)
In-Reply-To: <20160614093000.GB21689@sisyphus.home.austad.us>
On Tue, Jun 14, 2016 at 11:30:00AM +0200, Henrik Austad wrote:
> So loop data from kernel -> userspace -> kernelspace and finally back to
> userspace and the media application?
Huh? I wonder where you got that idea. Let me show an example of
what I mean.
void listener()
{
int in = socket();
int out = open("/dev/dsp");
char buf[];
while (1) {
recv(in, buf, packetsize);
write(out, buf + offset, datasize);
}
}
See?
> Yes, I know some audio apps "use networking", I can stream netradio, I can
> use jack to connect devices using RTP and probably a whole lot of other
> applications do similar things. However, AVB is more about using the
> network as a virtual sound-card.
That is news to me. I don't recall ever having seen AVB described
like that before.
> For the media application, it should not
> have to care if the device it is using is a soudncard inside the box or a
> set of AVB-capable speakers somewhere on the network.
So you would like a remote listener to appear in the system as a local
PCM audio sink? And a remote talker would be like a local media URL?
Sounds unworkable to me, but even if you were to implement it, the
logic would surely belong in alsa-lib and not in the kernel. Behind
the enulated device, the library would run a loop like the example,
above.
In any case, your patches don't implement that sort of thing at all,
do they?
Thanks,
Richard
next prev parent reply other threads:[~2016-06-14 18:26 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-11 23:01 [very-RFC 0/8] TSN driver for the kernel Henrik Austad
2016-06-11 23:01 ` [very-RFC 1/8] TSN: add documentation Henrik Austad
2016-06-11 23:01 ` [very-RFC 2/8] TSN: Add the standard formerly known as AVB to the kernel Henrik Austad
2016-06-11 23:01 ` [very-RFC 3/8] Adding TSN-driver to Intel I210 controller Henrik Austad
2016-06-11 23:01 ` [very-RFC 4/8] Add TSN header for the driver Henrik Austad
2016-06-11 23:01 ` [very-RFC 5/8] Add TSN machinery to drive the traffic from a shim over the network Henrik Austad
2016-06-11 23:01 ` [very-RFC 6/8] Add TSN event-tracing Henrik Austad
2016-06-12 16:58 ` Steven Rostedt
2016-06-12 21:25 ` Henrik Austad
2016-06-13 2:22 ` Steven Rostedt
2016-06-13 7:20 ` Henrik Austad
2016-06-11 23:01 ` [very-RFC 7/8] AVB ALSA - Add ALSA shim for TSN Henrik Austad
2016-06-15 11:49 ` Richard Cochran
2016-06-15 12:13 ` Henrik Austad
2016-06-15 12:43 ` Richard Cochran
2016-06-11 23:01 ` [very-RFC 8/8] MAINTAINERS: add TSN/AVB-entries Henrik Austad
2016-06-13 11:47 ` [very-RFC 0/8] TSN driver for the kernel Richard Cochran
2016-06-13 13:00 ` Henrik Austad
2016-06-13 19:32 ` Richard Cochran
2016-06-14 9:30 ` Henrik Austad
2016-06-14 18:26 ` Richard Cochran [this message]
2016-06-14 20:38 ` Henrik Austad
2016-06-15 7:04 ` Richard Cochran
2016-06-15 7:50 ` Henrik Austad
2016-06-15 11:41 ` Richard Cochran
2016-06-15 7:11 ` Richard Cochran
2016-06-13 19:37 ` Richard Cochran
2016-06-13 13:12 ` Arnd Bergmann
2016-06-13 15:56 ` John Fastabend
2016-06-14 8:35 ` Henrik Austad
2016-06-13 19:51 ` Richard Cochran
2016-06-14 11:18 ` One Thousand Gnomes
2016-06-14 17:04 ` Richard Cochran
2016-06-15 3:15 ` Takashi Sakamoto
2016-06-15 8:06 ` Richard Cochran
2016-06-18 5:22 ` Takashi Sakamoto
2016-06-18 22:45 ` Henrik Austad
2016-06-19 9:46 ` Richard Cochran
2016-06-20 8:05 ` Henrik Austad
2016-06-20 11:08 ` [alsa-devel] " Pierre-Louis Bossart
2016-06-20 11:49 ` Henrik Austad
2016-06-20 12:18 ` Richard Cochran
2016-06-20 12:31 ` Richard Cochran
2016-06-20 15:21 ` Richard Cochran
2016-06-21 5:54 ` Takashi Iwai
2016-06-21 6:38 ` Richard Cochran
2016-06-21 6:45 ` Takashi Iwai
2016-06-21 17:18 ` Pierre-Louis Bossart
2016-06-21 17:45 ` Pierre-Louis Bossart
2016-06-21 19:40 ` Richard Cochran
2016-06-22 12:36 ` Pierre-Louis Bossart
2016-06-23 10:38 ` Henrik Austad
2016-06-23 13:28 ` Richard Cochran
2016-06-15 3:27 ` Takashi Sakamoto
-- strict thread matches above, loose matches on Subject: below --
2016-06-11 22:22 Henrik Austad
2016-06-11 22:49 ` Henrik Austad
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