[pulseaudio-discuss] bluetooth headset connection and disconnection status

[Shinnosuke Suzuki]

Hi, 

> You can use libpulse to query the bluetooth card status (and you could
> use libpulse to also record and play audio - using parec and pacat
> sounds quite hacky if you're writing a serious application).
> pa_context_get_card_info_list() can be used to get the information
> about all cards. If you see the headset in the list, then it's
> connected.

Thank you for your advice.
I would like to use libpulse, but I couldn’t make it properly.
So I use parec/pacat command.
I'll get information from “pactl list cards”.

Best Regards,
Shinnosuke Suzuki

> On Apr 8, 2018, at 18:38, Tanu Kaskinen <tanuk at iki.fi> wrote:
> 
> On Tue, 2018-04-03 at 19:18 +0900, Shinnosuke Suzuki wrote:
>> Hi,
>> 
>> I am developing simple telephony app using pulseauio 11.1.
>> I would like to get status for bluetooth headset connection and
>> disconnection.
>> Is there any way to get status for connection and disconnection for
>> bluetooth headset?
>> I write a telephony app in C with parec and pacat command to handle
>> bluetooth headset.
>> So I would like to judge whether app can connect call with bluetooth
>> headset.
> 
> You can use libpulse to query the bluetooth card status (and you could
> use libpulse to also record and play audio - using parec and pacat
> sounds quite hacky if you're writing a serious application).
> pa_context_get_card_info_list() can be used to get the information
> about all cards. If you see the headset in the list, then it's
> connected.
> 
> The documentation for libpulse is here:
> https://freedesktop.org/software/pulseaudio/doxygen/index.html
> 
> The card might not have the right profile active, but pulseaudio should
> automatically switch to the HSP profile if you create a recording
> stream with the media.role property set to "phone". In case of parec
> that can be done by passing command line argument
> --property=media.role=phone . You can also manually switch the profile
> with pa_context_set_card_profile_by_name().
> 
> You can get notifications when things change (e.g. a new card appears)
> with the subscription API of libpulse.
> 
> -- 
> Tanu
> 
> https://liberapay.com/tanuk
> https://www.patreon.com/tanuk