Re: [LAD] RME TCO option

On 28/08/13 11:17, Jörn Nettingsmeier wrote:
> On 08/25/2013 10:33 PM, Adrian Knoth wrote:
>> On Fri, Aug 23, 2013 at 12:48:22PM +0100, Chris Goddard wrote:
>>
>>> Hi Adrian
>>
>> Hi!
>>
>> Let me CC Robin and LAD on this one.
>>
>>> Hope you don't mind me contacting you directly, but I have a
>>> question regarding the RME TCO option and how it is supposed to
>>> work. I saw your name on some ALSA commits relating to the TCO
>>> recently and thought you would at least be the right person to start
>>> by asking.
>>>
>>> The TCO can read ltc, but once it has done that how does it
>>> communicate that time information tothe user space ? If I was, say,
>>> running Ardour and wanted it to chase this ltc what would Ardour
>>> need to do to make use of it ?
>
> can't say how you get at the TCO input, but thanks to robin's recent
> work, ardour can chase an incoming smpte ltc signal. it is just
> another audio signal, connected to ardour's ltc input port.
>
> fwiw, you don't need a TCO to chase LTC at all. the TCO is interesting
> if you want to generate LTC in hardware, or if you want to _sync_ to
> LTC, i.e. recover a clock signal from it.
>
>

Right, and I was involved with Robin in adding that capability to
Ardour. But, this doesn't help with something like an RME MADI card,
that doesn't have any analogue inputs, where do you inject the LTC ? I
also think the offloading of the processing of the LTC would be useful.

--
Cheers
Chris
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