No audio, just noise with btsco
I have the following BT headset:
Requesting information ...
BD Address: 00:09:DD:30:65:2B
Device Name: BT Headset
LMP Version: 1.1 (0x1) LMP Subversion: 0x434
Manufacturer: Cambridge Silicon Radio (10)
Features: 0xfc 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
<encryption> <slot offset> <timing accuracy> <role switch> <hold mode> <sniff mode> <park state> <RSSI> <channel
quality>
<SCO link> <HV2 packets> <HV3 packets> <u-law log>
<A-law log>
<CVSD> <paging scheme> <power control> <transparent SCO>
I managed to compile snd-bt-sco.ko and btsco
./btsco -v 00:09:DD:30:65:2B
btsco v0.4c
Device is 1:0
Voice setting: 0x0060
RFCOMM channel 1 connected
^^
when playing something with aplay -D plughw:Headset sound.wav btsco says
speaker volume: 12 mic volume: 1
i/o needed: connecting sco...
connected SCO channel
Done setting sco fd
recieved AT+VGS=12
Sending up speaker change 12
^^
I hear increased noise but no sound. When aborting btsco says:
speaker volume: 12 mic volume: 1
driver is not in use
disconnected SCO channel
^^
from dmesg I get:
snd-bt-sco: playback_open
snd-bt-sco: prepare ok bps: 16000 size: 8000 count: 2000
snd-bt-sco: playback_trigger 1
snd-bt-sco: setting playback to bspcm
snd-bt-sco: playback_trigger 0
snd-bt-sco: setting playback to NULL
snd-bt-sco: Disposing of previous socket count 3
snd-bt-sco: file_count is 2 (expected 3)
^^
I found a posting on bluez-users pointing to http://sourceforge.net/mailarchive/message.php?msg_id=11431438
(http://sourceforge.net/mailarchive/message.php?msg_id=11487825)
but this did not work for me. Anyone having any hints?
regards
roland lezuo
Quoted 1 line · Roland Lezuo
I have the following BT headset:
The more interesting question might be what dongle you have.
It may sound strange, but audio transmission is not supported for all dongles.
As root(!) run "/usr/sbin/hciconfig hci0 revision"
it must say something like "SCO mapping: HCI". If it doesn't say anything about SCO _mapping_, the dongle is the problem. Don't get confused with the SCO MTU that will always be displayed.
See also: http://bluetooth-alsa.sourceforge.net/ Section Discussion
Quoted 2 lines
RFCOMM channel 1 connected
^^
Yeah - that's only control channel. Bit me, too.
CU, Andy
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Quoted 1 line
As root(!) run "
/usr/sbin/hciconfighci0 revision"
hci0: Type: USB
BD Address: 00:0A:3A:65:83:84 ACL MTU: 377:10 SCO MTU: 16:0
Firmware 0.3 / 9Quoted 1 line
it must say something like "SCO mapping: HCI". If it doesn't say
nope nothing...
...have to get another bluetooth dongle? Or firmware update?
regards
roland lezuo
here is something written about SCO link cap.
sudo hciconfig hci0 features
hci0: Type: USB
BD Address: 00:0A:3A:65:83:84 ACL MTU: 377:10 SCO MTU: 16:0
Features: 0xff 0xfe 0x0d 0x38 0x08 0x08 0x00 0x00
<3-slot packets> <5-slot packets> <encryption> <slot offset>
<timing accuracy> <role switch> <hold mode> <sniff mode> <RSSI> <channel quality> <SCO link> <HV2 packets> <HV3 packets> <u-law log> <A-law log> <CVSD> <power
control>
<transparent SCO> <enhanced iscan> <interlaced iscan> <interlaced pscan> <AFH cap. slave> <AFH cap. master>
regards
roland lezuo
Roland
Quoted 1 line
here is something written about SCO link cap.
Yes, the capability is there but the linux driver can't exploit it. If you have a usb adapter, there's no pain in replacing it but if it's a builtin adapter or on an embedded board then yes it is a real problem.
Brad
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