Re: [Bluez-devel] Comments about the Logitech/HP stereo headphones

[Marcel Holtmann <marcel@holtmann.org>]

Hi Guylhem,

> > My 0.02EUR: There is a problem here. Mayank turned up a very valid point
> > in his "a2play code not according to the specifications" posting: Having
> > the SBC encoding decoupled from the AVDTP negotiation is not a good
> > thing. One of the primary problems of the current pipe approach (and
> > expecting applications to stream SBC into a socket/device/whatever is
> > not different in this regard) is that the format of the SBC stream
> > (sample rate, channel mode, etc.) will have to depend on the
> > capabilities of the receiver, but there is no feedback to the encoder
> > about that.
> 
> Maybe the supported encodings/frequencies/etc. could be advertised in
> a separate file? The player would open it first, then send the sbc
> in one of the supported format

the advertised endpoints, encodings etc. can change dynamically and so
you would always need a L2CAP link on PSM 25 first. So this can't be an
option.

> > And also coupling /dev/a2dpN tightly to SBC format would make it even
> > harder (or impossible) to support other audio formats as A2DP does.
> 
> That was just a suggestion on the system behaviour - I mean having a
> device supporting a format. You could as well have
> /dev/a2dp0_sbc_someformat /dev/a2dp0_sbc_someotherformat etc. and try
> to open them until once doesn't return an error.

This is an ugly interface and won't even work. Do you wanna create a
connection to the headphone for every device node that you are testing?

Regards

Marcel




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