Re: HFP - No Audio

Matthew,

 That was my original email, but no success.  The BT adapter in the
raspberry pi 3 I was using does not show any SCO packets during the
call.  I've moved to an external BT device and I haven't had any
issues with it.

When the call is made, your screen should be *flooded* with SCO
packets.  If not, then you are experiencing the same problem that I've
never found a solution to.

Good luck,

Jason

On Wed, Jul 27, 2016 at 4:09 PM, Matthew Waddell [off-list ref] wrote:

Hi,

I am trying to configure HFP to allow in-call audio to be routed through my
PC's audio card.  I'm interested to know the current state of support, and
if anyone has had success in getting it to work.  I have tried various
combinations of the following components, but have so far been unable to get
the in-call audio working:

Kernel: 4.4.11, 4.6.4, 4.7 (unstable)
Bluez: 5.37, 5.7, 5.8, 5.9
Pulesaudio: 7, 8, 9
Ofono: 1.7, 1.8, 1.9
USB Bluetooth Adapters:
     0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (CSR8510 A10)
     0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0 (with firmware
001.002.014 build 1338)

I've can verify that ofono is able to detect the HFP capabilities of a
connected device, and to establish a 'modem' to it. Pulseaudio is also
notified when a call becomes active, and appears to load the appropriate
loopbacks to route the audio from/to the call through the HFP modem. Hacking
in some extra debug tracing to pulseaudio, I've verified that pulseaudio
receives SCO packets from the file descriptor that it receives from ofono.
Still, I am unable to hear any audio from the call.

Something interesting that I've noticed, however, is that if I look at the
in-call traffic with hcidump, it looks to me like the payloads of each of
the SCO packets that are received from the remote device (the phone) are
either all 0x0000 or 0x0001.  I have not seen cases where it is anything
other than that.

Does anyone have any suggestions for what might be going on, or how I might
be able to debug this further?

This post from May sounds like similar circumstances, and possibly even a
success story:
http://www.spinics.net/lists/linux-bluetooth/msg67283.html


Thanks!
_matt
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