[Bluez-devel] Bluetooth-Alsa: headsetd

[Bluez-devel] Bluetooth-Alsa: headsetd

[Tobias Wolf]

Hello,

i want to connect Bluetooth-Headsets to my Linux-Workstation for
Voip-Telephony with Ekiga.

So far i have used the btsco2 Userspace-Program with the kernel module
snd_bt_sco.

This is the Hardware, i've been working with:

BT-Dongle: Hama

hciconfig -a
hci0:   Type: USB
        BD Address: 00:10:60:D0:96:1A ACL MTU: 192:8 SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:808 acl:0 sco:0 events:29 errors:0
        TX bytes:460 acl:0 sco:0 commands:28 errors:0
        Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'toa8-0'
        Class: 0x100100
        Service Classes:
        Device Class: Computer, Uncategorized
        HCI Ver: 1.1 (0x1) HCI Rev: 0x460 LMP Ver: 1.1 (0x1) LMP Subver:
0x460
        Manufacturer: Cambridge Silicon Radio (10)


hciconfig hci0 revision
hci0:   Type: USB
        BD Address: 00:10:60:D0:96:1A ACL MTU: 192:8 SCO MTU: 64:8
        HCI 17.11
        Chip version: BlueCore02
        Max key size: 128 bit
        SCO mapping:  HCI

BT-Headset: Logitech Mobile Pro

With the kernel module and btsco2 i have succesfully connected the
headset with Ekiga and was able to make a phone call. Quality was pretty
good, although it happens from time to time the the called person hears
and awfully loud noise for a second or so. No fun in the long run.

So i took a look at http://bluetooth-alsa.sourceforge.net/ and saw that
Brad Midgley has done some updating on the doku since i visited the page
last time.

I read through the instructions on
https://help.ubuntu.com/community/BluetoothAudio. Specially the section
about "Configure SCO (aka mono, aka voice) Driver" and the "preferred
method" without any kernel module impressed me much.

But here starts my misery :S

1) I have compiled and installed project according to the instructions
found in btsco/alsa-plugins/BUILD. I think the alsa-libs were installed.

2) I have created the .asoundrc file:
# ALSA library configuration file

pcm.headset {
        @args [BDADDR TIMEOUT MAX_PERIODS]

        # The Bluetooth device address for target headset, used for
Audio Gateway (PC) initiated connections
        # Please note that this value is ignored when the connection is
Headset initiated
        @args.BDADDR {
                type string
                #default "00:13:17:30:B2:55" # Put your HS address here
                default "00:0D:44:5C:86:BA" # Logitech HS05  V02
        }

        # This value represents how long we will try to reach the
headset, until we give up.
        # Value is in milliseconds
        @args.TIMEOUT {
                type integer
                default 6000
        }

        # This is the size of the buffer used to queue Voice packets.
Value must be between
        # 2 and 334 (~ 1 second). Default value is 2 buffers, which
works well most of the
        # time, and has the advantage of giving us an ultra low delay
        @args.MAX_PERIODS {
                type integer
                default 334
        }

        type        sco
        bdaddr      $BDADDR
        timeout     $TIMEOUT
        max_periods $MAX_PERIODS
}

ctl.headset {
        type sco
}

pcm.a2dpd {
        type a2dpd
}

# Include settings that are under the control of asoundconf(1).
# (To disable these settings, comment out this line.)
</home/tobias/.asoundrc.asoundconf>

3) Now, the instructions tell me to change the device of, eg xmms to
headset, but the device never shows up (even after an reboot). So i
wanted to test with aplay:

aplay -B 1000000 -Dplug:pcm.headset /usr/share/sounds/alsa/Noise.wav

or

aplay -B 1000000 -D headset /usr/share/sounds/alsa/Noise.wav

With this result:

DEBUG: _snd_pcm_sco_open: Starting pcm_sco plugin.
DEBUG: _snd_pcm_sco_open: Open mode is for Playback.
aplay: main:544: Cannot open Audio Device: Permission denied

/var/log/daemon.log shows the following:
Nov  3 13:23:30 toa8 headsetd[14268]: Configuration phase ended: target
bdaddr is 00:0D:44:5C:86:BA, timeout is 6000 ms
Nov  3 13:23:30 toa8 headsetd[14268]: Changing state: Idle-->Paging
Nov  3 13:23:31 toa8 hcid[3371]: link_key_request
(sba=00:10:60:D0:96:1A, dba=00:0D:44:5C:86:BA)
Nov  3 13:23:31 toa8 headsetd[14268]: unable to connect L2CAP socket to
headset: Permission denied
Nov  3 13:23:31 toa8 headsetd[14268]: Changing state: Paging-->Idle


Has anyone a clue why i cant connect to L2CAP socket and what i have to
enable this ?

Furthermore, does anyone know if there exist the possibility to actually
 take an incoming come by pressing a button on the headset. In my setup
i have to be a my workstation and click on a button on my Softfon to
take a call.

Any help is greatly appreciated ;)

Have a nice Week-End,

Tobias Wolf

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Re: [Bluez-devel] Bluetooth-Alsa: headsetd

[Tobias Wolf]

Sorry, forgot to tell some detail.

Naturally i have the headset paired with the dongle and headsetd is
executed ;S

Sorry for not mentioning it in the first mail,

Tobias Wolf


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Re: [Bluez-devel] Bluetooth-Alsa: headsetd

[Fabien Chevalier]

Tobias,

I'm gonna soon send a new release of the plugin, the daemon, and the 
kernel patch to the list, you might wanna give it a try.

Cheers,

Fabien



Tobias Wolf wrote:
> Sorry, forgot to tell some detail.
> 
> Naturally i have the headset paired with the dongle and headsetd is
> executed ;S
> 
> Sorry for not mentioning it in the first mail,
> 
> Tobias Wolf
> 
> 
> -------------------------------------------------------------------------
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> Bluez-devel@lists.sourceforge.net
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> 
> 


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Re: [Bluez-devel] Bluetooth-Alsa: headsetd

[Marcel Hilzinger]

Am Freitag, 3. November 2006 13:35 schrieb Tobias Wolf:
> Hello,
[...]
> 3) Now, the instructions tell me to change the device of, eg xmms to
> headset, but the device never shows up (even after an reboot). =


You cannot choose it from a list. Just type a2dpd manually. It rocks :-)


-- =

=DCdv=F6zlettel -- Mit freundlichen Gr=FCssen,
Marcel Hilzinger

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Re: [Bluez-devel] Bluetooth-Alsa: headsetd

[Tobias Wolf]

Fabien Chevalier schrieb:
> Tobias,
> 
> I'm gonna soon send a new release of the plugin, the daemon, and the 
> kernel patch to the list, you might wanna give it a try.
> 
> Cheers,
> 
> Fabien
> 
Thx a lot.

I have been experimenting a little bit in the last days. I have mangaged
to use the alsa-plugin with xmms and it works.

But my softphone (EKIGA) doesn't allow me to manually type the alsa
device. Maybe i have to give the EKIGA-Community a hint, maybe they
change this.

But there is a more basic problem with sound quality and i want to know
if anyone of the has experienced the same.

If i use the kernel module snd_bt_sco and btsco2, i am able to make
phone calls with ekiga. But the people i have called told that sound
quality changed over time from good to very bad, in the end they get a
loud noise sound, and after that sound quality is good for a moment.
This repeats ever on.

As I understand bluetooth there are a set of frequencys and they are
changed frequently between the dongle and the headset. May it be, that i
have something in my enviroment that disturbs some frequencys, that
bluetooth uses, and everytime my headset reaches that region, sound
quality degrades ?

I say this, because we have an windows pc in the same room, and if the
make a call with bluetooth headset over this pc, the caller experiences
the same.

Tobias

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Re: [Bluez-devel] Bluetooth-Alsa: headsetd

[Fabien Chevalier]

Hi Tobias,

>>
> Thx a lot.
> 
> I have been experimenting a little bit in the last days. I have mangaged
> to use the alsa-plugin with xmms and it works.
> 
> But my softphone (EKIGA) doesn't allow me to manually type the alsa
> device. Maybe i have to give the EKIGA-Community a hint, maybe they
> change this.

I wrote a patch for Ekiga, so that you are able to select the headset as 
output device.
It is bundled with a mail i sent to the list yesterday, which 
unfortunately is still waiting for moderator approval, as it is a bit 
too big ;-)

> 
> But there is a more basic problem with sound quality and i want to know
> if anyone of the has experienced the same.
> 

Sorry i didn't experience that yet :-)

Cheers,

Fabien

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Re: [Bluez-devel] Bluetooth-Alsa: headsetd

[Tobias Wolf]

Fabien Chevalier schrieb:
> Hi Tobias,
> 
>> Thx a lot.
>>
>> I have been experimenting a little bit in the last days. I have mangaged
>> to use the alsa-plugin with xmms and it works.
>>
>> But my softphone (EKIGA) doesn't allow me to manually type the alsa
>> device. Maybe i have to give the EKIGA-Community a hint, maybe they
>> change this.
> 
> I wrote a patch for Ekiga, so that you are able to select the headset as 
> output device.
> It is bundled with a mail i sent to the list yesterday, which 
> unfortunately is still waiting for moderator approval, as it is a bit 
> too big ;-)
> 
Really, well i think i have to get hold of the Ekiga-Sources and try
your patch.

>> But there is a more basic problem with sound quality and i want to know
>> if anyone of the has experienced the same.
>>
> 
> Sorry i didn't experience that yet :-)
>
Hmmm, ok, strange, but that might indicate that it is a local phenomenon
and not related to bluetooth-alsa. I have changed the dongels and the
headsets, mostly Logitech, and everytime with the same result.

Tobias

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