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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Jelle de Jong wrote:
> 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
> 

I got a new device Motorola s9 today and did some more testing, it also 
has the issue that it connects in a way that when using other bluetooth 
devices the audio stops. When I manually set the device as master my 
bluetooth mouse is somewhat more responding then with the Motorola s805 
headset. But a reminder that everything works 100% fully under windows, 
so it should be possible to use the devices 100% with bluez somehow...

I attached device and hcitool info in addition the my previous message.

Kind regards,

Jelle

[-- Attachment #2: hcitool-info-motorola-s9.txt --]
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config a2dp - device = 00:0D:FD:18:6E:3C access_mode = 2
codec sbc - frequency = 1 channel_mode = 1 allocation = 1 subbands = 1 blocks = 1 bitpool = 44

hcitool con
Connections:
    < ACL 00:0D:FD:18:6E:3C handle 42 state 1 lm MASTER ENCRYPT
    > ACL 11:11:11:11:17:95 handle 43 state 1 lm MASTER

sudo hcitool info 00:0D:FD:18:6E:3C
Requesting information ...
    BD Address:  00:0D:FD:18:6E:3C
    Device Name: Motorola S9
    LMP Version: 2.0 (0x3) LMP Subversion: 0xe90
    Manufacturer: Cambridge Silicon Radio (10)
    Features: 0xff 0xff 0x8b 0xf8 0x1b 0x18 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>
        <transparent SCO> <broadcast encrypt> <enhanced iscan>
        <interlaced iscan> <interlaced pscan> <inquiry with RSSI>
        <extended SCO> <EV4 packets> <EV5 packets> <AFH cap. slave>
        <AFH class. slave> <AFH cap. master> <AFH class. master>
        <extended features>

[-- Attachment #3: hcitool-info-motorola-s805.txt --]
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config a2dp - device = 00:0C:55:D1:C9:78 access_mode = 2
codec sbc - frequency = 1 channel_mode = 1 allocation = 1 subbands = 1 blocks = 1 bitpool = 44

sudo hcitool sr 00:0C:55:D1:C9:78 master

sudo hcitool con
Connections:
    > ACL 11:11:11:11:17:95 handle 43 state 1 lm MASTER
    > ACL 00:0C:55:D1:C9:78 handle 42 state 1 lm MASTER

sudo hcitool info 00:0C:55:D1:C9:78
Requesting information ...
    BD Address:  00:0C:55:D1:C9:78
    Device Name: Motorola S805
    LMP Version: 2.0 (0x3) LMP Subversion: 0xa41
    Manufacturer: Cambridge Silicon Radio (10)
    Features: 0xff 0xff 0x8f 0x78 0x18 0x18 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>
        <enhanced iscan> <interlaced iscan> <interlaced pscan>
        <inquiry with RSSI> <AFH cap. slave> <AFH class. slave>
        <AFH cap. master> <AFH class. master> <extended features>

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