[Bluez-users] Headset audio capture failing when using Bluez's ALSA plugin

[Chip McArtor <mcm262@psu.edu>]

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Hello, I recently installed a USB bluetooth dongle with the intent of
using my Jabra BT500 headset in VOIP applications.  I've followed the
Bluez audio service wiki with some degree of success; audio playback on
my headset works flawlessly with a variety of players. Audio recording
through the headset's mic, on the other hand, consistently stops
capturing audio after what appears to be ~250ms into the recording session.

I've tested this using both arecord and Skype's test call feature.
Running arecord yields
$ arecord -D bluetooth -f S16_LE
>boo.wav                                       Recording WAVE 'stdin' :
Signed 16 bit Little Endian, Rate 8000 Hz, Mono
Aborted by signal Interrupt...
 (manually stopped after several seconds)

The output file boo.wav is exactly 250ms long, and appears to contain
the very beginning of my recording.  Skype similarly fails on the call
test (audio playback is fine, but the capture test fails to grab any
audio).  In both cases, the Jabra makes the "call end" tone when I
finish my recording test.  Also while recording, I get the following
system message several times:

hci_scodata_packet: hci0 SCO packet for unknown connection handle 45

Any thoughts on what the problem could be?  Thanks for your help.

Chip McArtor

Software versions:
bluez-libs 3.24
bluez-utils 3.24
alsa-lib 1.0.14a
linux 2.6.23 i686 SMP


BT adapter info:

hci0:   Type: USB
        BD Address: 00:15:83:BE:9C:58 ACL MTU: 384:8 SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:1984896 acl:74 sco:38817 events:196 errors:0
        TX bytes:1970090 acl:57 sco:38591 commands:67 errors:0
        Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'BlueZ (0)'
        Class: 0x080100
        Service Classes: Capturing
        Device Class: Computer, Uncategorized
        HCI Ver: 2.0 (0x3) HCI Rev: 0x7a6 LMP Ver: 2.0 (0x3) LMP Subver:
0x7a6
        Manufacturer: Cambridge Silicon Radio (10)


~/.asoundrc:

pcm.bluetooth {
   type bluetooth
   device 00:16:8F:08:8F:80
   profile "voice"
}


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