[pulseaudio-discuss] Bluetooth latencies

[Arun Raghavan]

cc'ing Luiz to see if he has any ideas.

-- Arun

On Sat, 28 May 2016, at 03:35 PM, Georg Chini wrote:
> Hello,
> 
> in module-bluez5-device.c latencies for bluetooth are defined as follows:
> 
> #define FIXED_LATENCY_PLAYBACK_A2DP (25 * PA_USEC_PER_MSEC)
> #define FIXED_LATENCY_PLAYBACK_SCO (125 * PA_USEC_PER_MSEC)
> #define FIXED_LATENCY_RECORD_A2DP   (25 * PA_USEC_PER_MSEC)
> #define FIXED_LATENCY_RECORD_SCO    (25 * PA_USEC_PER_MSEC)
> 
> This is similar in module-bluez4-device.c. Is there a reason why the
> latency for SCO playback is set so high? With my bluetooth devices,
> the latencies reported with pacmd list-sinks are similar for SCO and
> A2DP:
> 
> A2DP:
>            current latency: 25,67 ms
>            fixed latency: 45,32 ms
> 
> SCO:
>          current latency: 25,47 ms
>          fixed latency: 128,00 ms
> 
> Regards
>               Georg
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