A2DP source stuttering

[thezenox]

I have issues with stuttering audio output in A2DP source mode. See audio attached.
audio.zip
Using examples/bt_music_sender/bt_music_sender.ino
I just changed name of BT device to connect with.

esp32-arduino current Github master (4b3aebe) and current version of ESP32-A2DP (10db711)

Tested on ESP32-WROOM-32E and ESP32-WROVER-B, no difference. Tried different A2DP sinks (UE Boom, Echo Dot)

Any idea what could be wrong?

[pschatzmann]

Not sure, did you try to play with the delay in the callback of sketch: e.g. with delay(0), w/o it or just with a yied() ?

[thezenox]

With yield() and delay(0) it works fine, but watchdog triggers after ~20 seconds. delay(1) in get_data_frames() causes stuttering. Delay in loop() dosn't matter.

[pschatzmann]

So, if delay(1) is too much, maybe try it with delayMicroseconds().
Or you can try to call delay(1) only with every nth callback call....

[thezenox]

delayMicroseconds() does not reset wdt timer (as far as i know). If
I completly disable the WDT on both cores and use yield(), I get far less stuttering, just once every ~20 seconds. Still not perfect but much better.