Re: MIDI Through Port Number in ALSA Sequencer

On Sat, 24 Jul 2021 12:07:14 +0200, rv71@onet.eu wrote:

Hello,

ALSA Sequencer always creates MIDI Through Port with the id 14:0. However, I can't find where it is defined that this special port will have this particular id/number. I also don't see any definition in seq.h regarding this ( unlike the timer and announce special port, for example). Can you explain?

It's a fixed client number defined with SNDRV_SEQ_CLIENT_DUMMY in the kernel header include/uapi/sound/asequencer.h (which will be installed in /usr/include/sound/asequencer.h).

Oh, and now I noticed that the comment in sound/core/seq/seq_dummy.c is with an old number that is no longer correct. Will fix up :)

Takashi