[pulseaudio-discuss] SBC XQ for PA 13.0

Hyperion h1p8r10n at yandex.com
Mon Dec 9 12:49:19 UTC 2019

09.12.2019, 12:57, "Pali Rohár" <pali.rohar at gmail.com>:
> On Monday 09 December 2019 14:47:26 Andrey Semashev wrote:
>>  As a user, I don't know whether I can use SBC XQ. I don't know whether its
>>  bitrate will fit in my radio conditions. If my device happens to support SBC
>>  XQ, that is the codec that will get picked upon connection. Please, correct
>>  me if I'm wrong, but I don't see a way to influence that.
> You can ask same question for aptX-HD codec. It has also fixed high
> bitrate.
>>  SBC XQ is high quality and high bitrate, true, but PA should adapt to the
>>  actual use conditions.
> SBC XQ is defined with usage of one specific bitpool value.
>>  More so if it actually has the means to do so. If PA
>>  detects that SBC XQ does not fit in BT bandwidth, it should gradually drop
>>  quality.
> Maybe we can implement disconnecting SBC XQ profile when problem happen
> and connect again with SBC in Automatic quality.

Which would already be covered if my suggestion of a config switch had been taken in consideration ;)

And all this timeless discussion wouldn't happen...

my 2 cents

> But there is another problem. People who chose high quality codec do not
> want to see that application itself without their instruction decide to
> change codec to low quality. This is reason why non-SBC codecs are used.
> Because they provide one fixed quality which is same whatever bluetooth
> adapter or headphone you will use. SBC is criticized for a long time
> because current implementations automatically choose some quality which
> is not under user control. So for these reasons there is SBC LQ, MQ, HQ
> and XQ. You can choose what you want to use. By default is automatic
> mode which decreasing quality.
> --
> Pali Rohár
> pali.rohar at gmail.com
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