On Sun, Jun 12, 2011 at 2:59 PM, Lin, Mengdong <mengdong.lin at intel.com> wrote: > Could someone tell me how to use "sco_sink" and "sco_source" in the > bluetooth device module? > > > > Because of hardware restriction, our bluetooth driver cannot handle HSP data > transport. We want use an ALSA device?s sink and source for BT HSP > transport. It seems that by passing parameters to initialize the Bluetooth > discover and device module, a bluetooth device can use external ?sco-sink? > and ?sco-source? for HSP data transport. > > > > My questions: > > -????????? I can set the ALSA sink & source as the ?sco-sink? and > ?sco-source?, right? If yes, how can I set ?sco-source? and ?sco-sink? names > as the parameter to load Bluetooth discover module in the default script for > my platform? First, the BlueZ audio.conf indicates audio routing to pcm? As for the actual names afaik this depend on the platform, but I have never used them myself because my system uses hci routing. Btw, have you tried to hardcode the actual alsa device just to see what happens? > > -????????? Since ?sco-sink? and ?sco-source? are not dynamically created, so > I cannot routing inputs/outputs to them by hook the ?SINK-PUT? or > ?SOURCE-PUT? event, right? Not sure what you are talking about so I will just skip and let somebody else answer this. > > -????????? When can I move sink inputs or source outputs to the ?sco-sink? > and ?sco-source?? Their state changes outside of the Bluetooth device. How > are their state change synchronized with BT headset connection and > disconnection? In BT device module, ?I saw both ?start_thread? and state > change hook of ?sco-sink? and ?sco-source? call ?sco_over_pcm_state_update? > to setup data transport. So they can change to IDLE state at any time? Yes, sco_over_pcm_state_update should synchronize and yes they can change to IDLE which means we should disconnect SCO. > > -????????? Is there any extra work for the Bluetooth device or the device > providing actual ?sco-sink? and ?sco-source? to do? This is platform specific so we might need some kind of configuration support. > > -????????? Has the usage ?sco-sink? and ?sco-source? been verified on any > platform? Yes, both Nokia N900/fremantle and meego harmattan uses them, so we might need to check with them how to configure them. -- Luiz Augusto von Dentz Computer Engineer
