Re: [Bluez-devel] sco link help needed

[Marcel Holtmann <marcel@holtmann.org>]

Hi Mauro,

> > Yes it have to. You should read the mailing list archive and search for
> > comments from the CSR guys about SCO. And you can of course take the
> > Bluetooth specification itself.
> 
> could you please provide a url?

the Bluetooth specification can be found under www.bluetooth.org and the
links to the mailing list archives are at www.bluez.org.

> i have been trying to transfer pcm data over a sco socket both using scotest 
> and other similar apps of mine, but the actual data tranferred were only a 
> bunch of random bytes, completely unrelated to the data sent. moreover, the 
> behaviour of sco links is very unreliable. in my tests i have used several 
> usb dongles with CSR chips (firmware versions ranging from HCI 15.3 to HCI 
> 16.4) and kernel versions from 2.4.22 to 2.4.25-pre7.
> 
> you have told us many times that there are strong limitations in what you can 
> do with sco sockets, but i still can't understand what are these limitations. 
> i have tried searching trough the archives but i couldn't find anything 
> interesting about this.

How often must I repeat this? We are doing audio over SCO and no data
transfer. Even with transparent SCO as air coding the results on both
ends must not be the same.

> > Again, I can't follow what you are trying to achieve. The current socket
> > interface for SCO fits not perfect, because it is audio only data.
> 
> does this mean that you simply can't perform pcm audio transfers between two 
> bluez hosts by using sco sockets just like scotest does? if so, what is the 
> purpose of scotest, then?

You can send PCM audio over a SCO socket, but you can't expect that the
PCM stream on the other side is byte by byte the same. It only sounds
the same.

Regards

Marcel




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