On Sun, Nov 15, 2015 at 8:56 PM, Chris Caudle <chris@chriscaudle.org> wrote:

On Sun, November 15, 2015 7:03 pm, Hai Nguyen wrote:
> I was wondering what kind of mapping there is between say L and
> R channels and JACK ports? Or does a mapping even exists?

Think of jackd like a patchbay for audio. From the jack standpoint there
are only incoming audio ports and outgoing audio ports, any meaning
assigned to those ports like left, right, is up to you.

all true, although a port's flags do provide some indications:

IsTerminal: this port represents the "edge" of JACK: data delivered or received here

comes from or goes to "outside" JACK

IsPhysical: this port represents a hardware audio channel

there is also a metadata API that allows arbitrary information to be associated with ports. Unfortunately, it has only been implemented for JACK1 at this time.