Re: [Bluez-users] step by step - how to get your bluetooth stereo headset fully working with the bluez software stack under linux

[Jelle de Jong <jelledejong@powercraft.nl>]

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Chris Carlin wrote:
> Just to finish this up, Jelle, what type of bluetooth adapter do you have?
> 
> ~Chris
> 
> Jelle de Jong wrote:
>> Hello everybody,
>>
>> I have been playing around with bluetooth devices under linux the last 
>> month or so. I got some very good and some very bad experience with it.
>>
>> I am planning to create some wiki pages when I can get things working 
>> 100%. However I still got some major issues that I need to overcome.
>>
>> I bought a Motorola Bluetooth S805 stereo headset. It should get the 
>> following functionality:
>>
>> - Playback of stereo quality audio without distortions and without delay 
>> when playing audio and video at the same time.
>> - Generic playback controls like playpause/stop/next/previous.
>> - Internal microphone to record audio, used for audio recordings and 
>> audio video conferences.
>>
>> I was planning to get things up and running step by step:
>> - alsa configuration
>> - bluetooth configuration
>> - input device configuration
>>
>> So the alsa configuration exist out of:
>> -- handle multiple audio streams (slave devices)
>> -- make the device default or as a plugin
>> -- use multiple bluetooth headset for the same audio (conference)
>> -- use multiple bluetooth headset per user based (multiseat)
>> -- force audio to use the correct bit-rate and frequency for the devices?
>> -- set-up correct buffer so that playback is without distortions of out 
>> of sync audio and video. (testing with totem-xine?)
>> -- configure multiple profiles for stereo recording/playback
>>
>> Would somebody be willing to sent his working alsa configuration files 
>> that can do some of the above functions:
>>
>> On this moment the headset plays stereo audio, but when watching video 
>> with and audio dvd on totem-xine the audio is out of sync and when 
>> scrolling or skipping chapters it get worse and hidd can even crash with 
>> segmentation faults. There is also a lot of noise distortions.


I attached the information about the bluetooth adapter.

Is it a good idea to create some bug reports, then i can put all the 
information on one central place, and hopefully can also track the progress.

I switched back to alsa and lib-xine because gstreamer does not handles 
dvd playback very well, and pulse creates a to heavy cpu load for my system.

When playing back a dvd with totem with lib-xine and my bluetooth 
headset i got a few killer issues, that are directly bluez related:

1. when playing dvd audio, there is a audio conversion/compression 
problem, how higher the audio quality how greater the audio glitches. It 
is a really anoying glitch, it a sort of click sound.

A/52 2.0 (stereo)
48000 Hz
224 kbps

2. When my headset connects its becomes a slave by default, and i am 
also using a bluetooth mouse, that is master by default. When i move my 
mouse the audio stops and i need to pause and play to resync audio and 
video. I now execute sudo hcitool sr 00:0C:55:D1:C9:78 master everytime 
i start using the headset, but this causes the bluetooth mouse cursor to 
shock when playing high quality sound. And its not a cpu issue i am not 
using 100%. So i got a real bandwidth priority issue with bluez....?

Thanks in advance,

Jelle

[-- Attachment #2: cirago bluethooth usb adapter micro BTA-3210.txt --]
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sudo hciconfig -a
hci0:   Type: USB
    BD Address: 00:1B:DC:00:3E:0B ACL MTU: 310:10 SCO MTU: 64:8
    UP RUNNING PSCAN ISCAN
    RX bytes:47051 acl:2702 sco:0 events:186 errors:0
    TX bytes:1622 acl:39 sco:0 commands:61 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: '[debian-eeepc] / BT Device 0'
    Class: 0x080108
    Service Classes: Capturing
    Device Class: Computer, Server
    HCI Ver: 2.0 (0x3) HCI Rev: 0xc5c LMP Ver: 2.0 (0x3) LMP Subver: 0xc5c
    Manufacturer: Cambridge Silicon Radio (10)

sudo hciconfig hci0 features
hci0:   Type: USB
    BD Address: 00:1B:DC:00:3E:0B ACL MTU: 310:10 SCO MTU: 64:8
    Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80
        <3-slot packets> <5-slot packets> <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> <broadcast encrypt>
        <EDR ACL 2 Mbps> <EDR ACL 3 Mbps> <enhanced iscan>
        <interlaced iscan> <interlaced pscan> <inquiry with RSSI>
        <extended SCO> <EV4 packets> <EV5 packets> <AFH cap. slave>
        <AFH class. slave> <3-slot EDR ACL> <5-slot EDR ACL>
        <AFH cap. master> <AFH class. master> <EDR eSCO 2 Mbps>
        <EDR eSCO 3 Mbps> <3-slot EDR eSCO> <extended features>

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