[pulseaudio-discuss] [PATCH] bluetooth: Correct fixed latency for HSP sink

Georg Chini georg at chini.tk
Tue Feb 14 09:51:05 UTC 2017

On 14.02.2017 10:25, Tanu Kaskinen wrote:
> On Sat, 2017-02-04 at 19:34 +0100, Georg Chini wrote:
>> The fixed latency for the HSP sink was set to 125 ms plus one write block size.
>> pa_sink_get_latency() however returns 28 ms like it does for A2DP and also for
>> the HSP source.
>> Therefore this patch corrects the fixed latency of the HSP sink to 25 ms plus
>> one write block size, assuming that the original value of 125 ms was a typo.
> I believe latency reporting in module-bluez5-device is broken, so it
> can't be used as a justification for changing the constants. module-
> bluez4-device includes the fixed latency in its latency reports.
> module-bluez5-device does that too, but it only uses the A2DP constants
> (even when HSP is active). That's probably because originally module-
> bluez5-device only supported A2DP, and when HSP support was added
> later, updating the latency reporting code was just forgotten.
Thanks for the review. You are right, the correct justification would be,
that it can be expected that HSP recording produces the same delay as

Do you think it is OK if I send a fix for the other bug (which looks easy
to fix) and include that change? Or would you prefer to leave the constants
as they are?

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