[Bluez-devel] Re: btsco and alsa driver interaction

[soraberri <421246@posta.unizar.es>]

Hi

many thanks Brad! I didn't think in the mixer before... now I think I 
got it :O
(by the way, I haven't forgotten about adding support in the audio 
gateway as you suggested one day, in order to let the headset intiate an 
audio connection. This would require the proper SDP record in the 
database with the proper RFCOMM channel number, and a RFCOMM socket 
listening in the application. I made some copy-paste for the first thing 
in sdptool code, but I haven't find the rigth place for the listening 
socket yet... I have much left to study I guess!)

best regards

Luis_Peiro



Brad Midgley wrote:
> Luis
> 
> It's good to see your interest... I think you have the right ideas on 
> how things work.
> 
>> I also imagine that when we poll data from the hwdep interface, we are 
>> not polling SCO data type (which I assume it is being drived 
>> automatically); instead, we are polling for volume-control data type 
>> which is enigmatically (for me) generated at the core of the driver. 
>> Is it right?
> 
> 
> if the volume change is initiated through a generic mixer, then yes. 
> Think of a mixer application running on your computer. Run any 
> alsa-aware mixer and it will let you choose the alsa mixer device to be 
> the headset.
> 
>> The question is, 'when does the following condition evaluate TRUE  ?
>>
>> if (!snd_hwdep_poll_descriptors_revents(handle, &pfds[nfds - 1], 1, 
>> revents) && revents & POLLIN) {
> 
> 
> It evaluates true when there are volume-change events to be examined 
> that were initiated through a soft mixer.
> 
> Brad
> 
> 
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