On Sat, Dec 17, 2016 at 10:05:54AM +0100, Henrik Austad wrote:
> I'm sending out a new set now because, what I have works _fairly_ well for
> testing and a way to see what you can do with AVB. Using spotify to play
> music on random machines is quite entertaining.
You have missed the point about
On Fri, Dec 16, 2016 at 06:59:09PM +0100, hen...@austad.us wrote:
> +/*
> + * List of current subtype fields in the common header of AVTPDU
> + *
> + * Note: AVTPDU is a remnant of the standards from when it was AVB.
> + *
> + * The list has been updated with the recent values from IEEE 1722, draft
On Fri, Dec 16, 2016 at 06:59:04PM +0100, hen...@austad.us wrote:
> The driver is directed via ConfigFS as we need userspace to handle
> stream-reservation (MSRP), discovery and enumeration (IEEE 1722.1) and
> whatever other management is needed.
I complained about configfs before, but you didn't
On Thu, Jun 23, 2016 at 12:38:48PM +0200, Henrik Austad wrote:
> Richard: is it fair to assume that if ptp4l is running and is part of a PTP
> domain, ktime_get() will return PTP-adjusted time for the system?
No.
> Or do I also need to run phc2sys in order to sync the system-time
> to PTP-time?
On Tue, Jun 21, 2016 at 10:45:18AM -0700, Pierre-Louis Bossart wrote:
> You can experiment with the 'dma' and 'link' timestamps today on any
> HDaudio-based device. Like I said the synchronized part has not been
> upstreamed yet (delays + dependency on ART-to-TSC conversions that made it
> in the k
On Tue, Jun 21, 2016 at 07:54:32AM +0200, Takashi Iwai wrote:
> > I still would appreciate an answer to my other questions, though...
>
> Currently HD-audio (both ASoC and legacy ones) are the only drivers
> providing the link timestamp. In the recent code, it's PCM
> get_time_info ops, so you ca
On Mon, Jun 20, 2016 at 02:31:48PM +0200, Richard Cochran wrote:
> Where is this "audio_time" program of which you speak?
Never mind, found it in alsa-lib.
I still would appreciate an answer to my other questions, though...
Thanks,
Richard
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On Mon, Jun 20, 2016 at 02:18:38PM +0200, Richard Cochran wrote:
> Documentation/sound/alsa/timestamping.txt says:
Examples of typestamping with HDaudio:
1. DMA timestamp, no compensation for DMA+analog delay
$ ./audio_time -p --ts_type=1
Where is this "audio_time" pro
On Mon, Jun 20, 2016 at 01:08:27PM +0200, Pierre-Louis Bossart wrote:
> The ALSA API provides support for 'audio' timestamps (playback/capture rate
> defined by audio subsystem) and 'system' timestamps (typically linked to
> TSC/ART) with one option to take synchronized timestamps should the hardwa
On Sun, Jun 19, 2016 at 12:45:50AM +0200, Henrik Austad wrote:
> edit: this turned out to be a somewhat lengthy answer. I have tried to
> shorten it down somewhere. it is getting late and I'm getting increasingly
> incoherent (Richard probably knows what I'm talking about ;) so I'll stop
> for n
On Wed, Jun 15, 2016 at 02:13:03PM +0200, Henrik Austad wrote:
> On Wed, Jun 15, 2016 at 01:49:08PM +0200, Richard Cochran wrote:
> And how would v4l2 benefit from this being in alsalib? Should we require
> both V4L and ALSA to implement the same, or should we place it in a common
&g
Now that I understand better...
On Sun, Jun 12, 2016 at 01:01:35AM +0200, Henrik Austad wrote:
> Userspace is supposed to reserve bandwidth, find StreamID etc.
>
> To use as a Talker:
>
> mkdir /config/tsn/test/eth0/talker
> cd /config/tsn/test/eth0/talker
> echo 65535 > buffer_size
> echo 08:00
On Wed, Jun 15, 2016 at 09:04:41AM +0200, Richard Cochran wrote:
> On Tue, Jun 14, 2016 at 10:38:10PM +0200, Henrik Austad wrote:
> > Whereas I want to do
> >
> > aplay some_song.wav
>
> Can you please explain how your patches accomplish this?
Never mind. Looking b
On Wed, Jun 15, 2016 at 12:15:24PM +0900, Takashi Sakamoto wrote:
> > On Mon, Jun 13, 2016 at 01:47:13PM +0200, Richard Cochran wrote:
> >> I have seen audio PLL/multiplier chips that will take, for example, a
> >> 10 kHz input and produce your 48 kHz media clock. With
On Tue, Jun 14, 2016 at 10:38:10PM +0200, Henrik Austad wrote:
> Where is your media-application in this?
Um, that *is* a media application. It plays music on the sound card.
> You only loop the audio from
> network to the dsp, is the media-application attached to the dsp-device?
Sorry, I thou
On Tue, Jun 14, 2016 at 10:38:10PM +0200, Henrik Austad wrote:
> Whereas I want to do
>
> aplay some_song.wav
Can you please explain how your patches accomplish this?
Thanks,
Richard
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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()
{
On Tue, Jun 14, 2016 at 12:18:44PM +0100, One Thousand Gnomes wrote:
> On Mon, 13 Jun 2016 21:51:36 +0200
> Richard Cochran wrote:
> >
> > Actually, we already have support for tunable clock-like HW elements,
> > namely the dynamic posix clock API. It is trivial to write
On Mon, Jun 13, 2016 at 01:47:13PM +0200, Richard Cochran wrote:
> 3. ALSA support for tunable AD/DA clocks. The rate of the Listener's
>DA clock must match that of the Talker and the other Listeners.
>Either you adjust it in HW using a VCO or similar, or you do
>ada
On Mon, Jun 13, 2016 at 03:00:59PM +0200, Henrik Austad wrote:
> On Mon, Jun 13, 2016 at 01:47:13PM +0200, Richard Cochran wrote:
> > People have been asking me about TSN and Linux, and we've made some
> > thoughts about it. The interest is there, and so I am glad to see
&g
On Mon, Jun 13, 2016 at 03:00:59PM +0200, Henrik Austad wrote:
> On Mon, Jun 13, 2016 at 01:47:13PM +0200, Richard Cochran wrote:
> > Which driver is that?
>
> drivers/net/ethernet/renesas/
That driver is merely a PTP capable MAC driver, nothing more.
Although AVB is in the d
Henrik,
On Sun, Jun 12, 2016 at 01:01:28AM +0200, Henrik Austad wrote:
> There are at least one AVB-driver (the AV-part of TSN) in the kernel
> already,
Which driver is that?
> however this driver aims to solve a wider scope as TSN can do
> much more than just audio. A very basic ALSA-driver is
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