[alsa-devel] [PATCH 1/2] amidi: ignore not only Active Sensing but all System Real-Time messages

[Clemens Ladisch]

Ricard Wanderlof wrote:
> On Mon, 11 Apr 2016, Clemens Ladisch wrote:
>> Ricard Wanderlof wrote:
>>> I would argue that it would be better to have both options, somehow. I.e.
>>> active sensing is mostly a nuisance, but I can imagine occasions
>>> (analyzing the output from a sequencer perhaps) where one would want to
>>> keep the rest of the real time messages.
>>
>> I can imagine this too, and even more complex filters.
>>
>> But the amidi tool is designed to be simple, and works on the lowest
>> level, with raw MIDI bytes.  This makes it appropriate to handle SysEx
>> stuff and to debug low-level hardware problems, but when you care about
>> the semantics of the messages, you should use a higher-level tool, such
>> as aseqdump.
>>
>> Filtering out clock messages serves an actual need.  But I am not
>> willing to add complexity for a problem that is, at the moment, nothing
>> but a figment of our imaginations.
>
> My argument is really that currently amidi has an option for filtering out
> active sensing, which has probably been added as it serves a useful
> purpose in its own right. The patch replaces that filter with one that
> filters out everything from F8 (clock) and up

I consider this change a bug fix; I just forgot about clock messages
when I originally impemented the filter.

> I think it would be better to keep the existing option, and add a new
> one, rather than to essentially change the meaning of the existing
> option.

That would be a new feature.


Regards,
Clemens