Re: [Bluez-devel] sco link help needed

["Dr. Simon Vogl" <vogl@soft.uni-linz.ac.at>]

Yes, there seems to be something utterly wrong, indeed - I spent four 
days debugging my apps (down
to the hci_usb driver) until I found out that I do not get a byte of 
audio data with that acer bt stick (mind,
though, that I get the connection set up all right, and that I cound 
send an audio stream). After a change
to a newer Acer stick my apps first worked fine, but sometimes the sco 
connections don't get set up ...

Strange.
Simon

James Courtier-Dutton wrote:

> Mauro Tortonesi wrote:
>
>>>
>>> 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.
>>
>>
>>
>> i haven't tried, but i don't suppose that infinite series of zeros i 
>> get on the receiver sounds just like art blakey's alamode. there is 
>> surely something wrong in the transfer process. could it be the fact 
>> that my hosts have an usb-uhci controller?
>>
>
> If you are receiving only zeros at the far end, the problem is with 
> the sco driver or the hci-usb driver or the uhci_hcd driver.
>
> I currently think the hci-usb driver is at fault, but I am doing 
> research with the linux usb developers to discover how they think it 
> should be done, and then I will look at the hci-usb driver and see if 
> it is doing things correctly.
>
> With my system, the urbs are failing the submit_urb in the hci-usb 
> driver on kernel 2.6.3, so the hci-usb driver must be doing something 
> wrong as the new kernel usb code does more checks in order to catch 
> badly behaved applications. I think they are taking the approach that 
> if an application is behaving badly, make it fail completely, thus 
> forcing the program writter to correct it. Seems like a good policy to 
> me. It is better to have an application working 100% of the time or 0% 
> of the time, rather than randomly working/not working.
>
> Cheers
> James
>
>
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