Experiencing Stuttering and Audio Interruptions in Bluetooth Calls with Pulseaudio

[bruno.tx]

Hello @ferranmc,

@ferranmc

With only bluealsa (without PulseAudio installed), I don’t experience the audio interruptions.

Thanks for the confirmation.
I was also able to confirm this by following the configuration from the following post: Bluetooth Hands Free Phone no audio - #5 by rafael.tx

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@ferranmc

Another thing that happened is that, using PulseAudio, when pairing the same phone, sometimes it only supported A2DP and the handsfree_audio_gateway profile was not available, while other times it was available. What causes this? Is there a way to force the profile to be available?

From my testing, when using pulseaudio it seems the phone requests which mode the device should be in.
For example, when using music playback the device gets switched automatically to a2dp, while when making calls the device gets switched to handsfree_audio_gateway.

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What I think may be the solution is to get a working setup with BlueAlsa and try to use Pulseaudio over bluealsa.

@ferranmc

In verbose mode, I see the following:

I: [pulseaudio] client.c: Freed 4 "Native client (UNIX socket client)"
I: [pulseaudio] protocol-native.c: Connection died.

I: [pulseaudio] client.c: Created 5 "Native client (UNIX socket client)"
I: [pulseaudio] protocol-native.c: Got credentials: uid=1000 gid=1000 success=1
I: [pulseaudio] pcm.c: Unknown PCM bluetooth
I: [pulseaudio] alsa-util.c: Error opening PCM device bluetooth: No such file or directory
E: [pulseaudio] module.c: Failed to load module "module-alsa-sink" (argument: "device=bluetooth"): initialization failed.
I: [pulseaudio] client.c: Freed 5 "pactl"
I: [pulseaudio] protocol-native.c: Connection died.

Do you have any idea why this error occurs? Is there any additional configuration I should check?

Have you tested this while running alsaloop?

It may also be possible that using some combination of module-alsa-sink, module-alsa-source and module-alsa-card would be needed, considering there is both a sound input and output involved in a call.
The following page contains relevant information about the arguments available for these modules: Modules – PulseAudio

Best Regards,
Bruno