[pulseaudio-discuss] Bluetooth latencies

[Georg Chini]

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