[pulseaudio-discuss] Bluez Questions

[Luiz Augusto von Dentz]

Hi Georg,

On Tue, Nov 4, 2014 at 3:00 PM, Tanu Kaskinen
<tanu.kaskinen at linux.intel.com> wrote:
> On Mon, 2014-11-03 at 20:05 +0100, Georg Chini wrote:
>> Hello,
>>
>> i have two (unrelated) questions regarding bluez5 (with ofono backend):
>>
>> 1) I am using the subscription API and when my headset changes profile
>> the subscription callback (with mask PA_SUBSCRIPTION_MASK_CARD) is
>> called twice. Is this correct? if yes, one call is for the profile
>> change, what
>> is the reason for the other one?
>
> I don't know.

Could be a bug.

>> 2) I am playing back audio from my phone to my bluetooth headset. When
>> I now switch off the headset, bluetooth takes a while to recognize, that the
>> headset is no longer available. When pulse receives the notification
>> that the
>> headset is gone, the stream is switched to the default device and starts
>> playing exactly at the point where the headset was switched off and goes on
>> playing for a while after I stop playback on the phone. All future sounds I
>> feed into th loopback module are now delayed by the gap between
>> the switch off of the headset and the moment pulseaudio is notified.
>> Is there a way to reset the loopback module to its initial state?
>
> No, there's no "reset loopback" feature. The loopback also has the
> problem that if the initial startup of the sink takes a long time, that
> also causes unwanted latency.
>
> The loopback module could probably be improved by discarding data from
> the source until the sink asks for data for the first time (would fix
> the slow startup problem) and flushing the buffer when the sink input
> gets detached (would help with your problem).

+1, either we do this unconditionally or have an API to define such policies.

>
> --
> Tanu
>
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-- 
Luiz Augusto von Dentz