Re: [Bluez-devel] Hp bluetooth headset a2dp

Re: [Bluez-devel] Hp bluetooth headset a2dp

[Shawn Rutledge]

--- Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Shawn,
> 
> > I have a pair of these headphones too, at work.  (My job involves a
> > cellphone media player application which depends on being able to
> > stream A2DP.)  There are a lot of them on ebay, going for 83.99USD,
> > just search for "ipaq headphones".
> 
> they are more expensive here in Germany. The cheapest I found was for
> around 112 EUR.

Well some ebay sellers will export them, I think.

> > I also have the Aiptek and Bluetake ones.  I just noticed that so
> much
> > activity with A2DP has been happening while I was not paying
> attention,
> > so I will try to do some testing.
> 
> The Aiptek is not conforming to the specification. However the SBC
> over
> RFCOMM is a nice feature.

Is SBC over RFCOMM the only method they support?  Or is their "not
conforming" just in small points?

I noticed that they don't work with either our phone or the BlueSoleil
but wasn't sure why.  And they do say in the manual that they support
A2DP, and explain how to bond them, enter pin "0000" etc.  I emailed
tech support but haven't got a response yet.

Too bad - IMO those are the only ones so far that are actually
comfortable.  The iPAQ ones aren't too bad either.

. _______  Shawn T. Rutledge / KB7PWD ecloud@bigfoot.com
 (_  | |_)    http://ecloud.org/  kb7pwd@kb7pwd.ampr.org
 __) | | \______________________________________________


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Re: [Bluez-devel] Hp bluetooth headset a2dp

[Marcel Holtmann]

Hi Shawn,

> > > I also have the Aiptek and Bluetake ones.  I just noticed that so
> > much
> > > activity with A2DP has been happening while I was not paying
> > attention,
> > > so I will try to do some testing.
> > 
> > The Aiptek is not conforming to the specification. However the SBC
> > over
> > RFCOMM is a nice feature.
> 
> Is SBC over RFCOMM the only method they support?  Or is their "not
> conforming" just in small points?

the SBC over RFCOMM is additional.

> I noticed that they don't work with either our phone or the BlueSoleil
> but wasn't sure why.  And they do say in the manual that they support
> A2DP, and explain how to bond them, enter pin "0000" etc.  I emailed
> tech support but haven't got a response yet.
> 
> Too bad - IMO those are the only ones so far that are actually
> comfortable.  The iPAQ ones aren't too bad either.

You will find almost every information about that in the mailing list
archive. However the problem with the Aiptek is that it conforms to
AVDTP, but then it does not conform to A2DP when it comes to sending the
actual SBC stream.

Regards

Marcel




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Re: [Bluez-devel] Hp bluetooth headset a2dp

[Shawn Rutledge]

I have a pair of these headphones too, at work.  (My job involves a
cellphone media player application which depends on being able to
stream A2DP.)  There are a lot of them on ebay, going for 83.99USD,
just search for "ipaq headphones".  My impression is that they did a
pretty decent job of implementing A2DP on the headphones, but with the
iPAQ drivers that they ship, the audio quality is not that great.  They
sound much better when streaming audio to them from a PC that has the
BlueSoleil Windows stack installed.  (So far the only A2DP
implementation for Windows that I've been able to get my hands on.) 
I'd love to be able to stream to them from Linux.  :-)

If anybody wants BlueSoleil for testing and comparison, the cheapest
way is to buy a Bluetake 007Si USB adapter.  BlueSoleil only works with
licensed devices.

I also have the Aiptek and Bluetake ones.  I just noticed that so much
activity with A2DP has been happening while I was not paying attention,
so I will try to do some testing.

--- Guylhem Aznar <bluez-devel@externe.net> wrote:
> On Thursday, 24 March 2005 at 18:04:22 (+0100), Marcel Holtmann
> wrote:
> > does somebody wants to donate one of these to me? Then I can start
> 
> Unfortunately I only have one. I could hardly purchase it after days
> of looking for one - such a2dp devices are not very frequent :-(
> 
> So I can lend it to how as long as you want, but I'd like it back
> someday :-)
> 
> Send me your address...


. _______  Shawn T. Rutledge / KB7PWD ecloud@bigfoot.com
 (_  | |_)    http://ecloud.org/  kb7pwd@kb7pwd.ampr.org
 __) | | \______________________________________________


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Re: [Bluez-devel] Hp bluetooth headset a2dp

[Marcel Holtmann]

Hi Shawn,

> I have a pair of these headphones too, at work.  (My job involves a
> cellphone media player application which depends on being able to
> stream A2DP.)  There are a lot of them on ebay, going for 83.99USD,
> just search for "ipaq headphones".

they are more expensive here in Germany. The cheapest I found was for
around 112 EUR.

>   My impression is that they did a
> pretty decent job of implementing A2DP on the headphones, but with the
> iPAQ drivers that they ship, the audio quality is not that great.  They
> sound much better when streaming audio to them from a PC that has the
> BlueSoleil Windows stack installed.  (So far the only A2DP
> implementation for Windows that I've been able to get my hands on.) 

The Impulsesoft BluePC should also work and AVM showed their A2DP plans
at CeBIT.

> I'd love to be able to stream to them from Linux.  :-)

Me too. And especially direct and transparent through ALSA.

> I also have the Aiptek and Bluetake ones.  I just noticed that so much
> activity with A2DP has been happening while I was not paying attention,
> so I will try to do some testing.

The Aiptek is not conforming to the specification. However the SBC over
RFCOMM is a nice feature.

Regards

Marcel




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Re: [Bluez-devel] Hp bluetooth headset a2dp

[Guylhem Aznar]

On Thursday, 24 March 2005 at 10:34:26 (-0800), Shawn Rutledge wrote:
> I have a pair of these headphones too, at work.  (My job involves a
> cellphone media player application which depends on being able to

Wow. Maybe you could fix a2play then?

> stream A2DP.)  There are a lot of them on ebay, going for 83.99USD,
> just search for "ipaq headphones".  My impression is that they did a

Ah - didn't know they were so common in the US. They are hard to find in =
France.

> I also have the Aiptek and Bluetake ones.  I just noticed that so much
> activity with A2DP has been happening while I was not paying attention,
> so I will try to do some testing.

Thanks, I think it'd be very appreciated - especially if you know a2dp

--=20
Bien =E0 vous - Best regards,
Guylhem P. Aznar

--=20
*@externe.net                                            http://externe.n=
et
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[Bluez-devel] Hp bluetooth headset a2dp

[Guylhem Aznar]

Hello

I didn't have time to play with them for sometime. Guess what happens
when I try them again today? Acceptable audio !
Same hardware, same binaries - nothing changed !

I then realised it was making sudden accelerations (little by little),
then suddently going back to normal, and so on during audio playback.

subbands =3D 1
allocation method =3D 1
channel_mode =3D 2
blocks =3D 3
sampling frequency =3D 2
bitpool =3D 32
frame len =3D 72
Using address: 00:0D:44:2A:09:00

I started to do something else, and now even after power cycling,
relinking, it's not playing anymore.

Wow. Any idea on that strange beast?

PS: I was suggested to try to record a session of normal audio
interaction. How can it be done? I'll try to borrow a frieds ipaq and
see how it is supposed to work.


--=20
Bien =E0 vous - Best regards,
Guylhem P. Aznar

--=20
*@externe.net                                            http://externe.n=
et
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Re: [Bluez-devel] Hp bluetooth headset a2dp

[Marcel Holtmann]

Hi Guylhem,

> I didn't have time to play with them for sometime. Guess what happens
> when I try them again today? Acceptable audio !
> Same hardware, same binaries - nothing changed !
> 
> I then realised it was making sudden accelerations (little by little),
> then suddently going back to normal, and so on during audio playback.
> 
> subbands = 1
> allocation method = 1
> channel_mode = 2
> blocks = 3
> sampling frequency = 2
> bitpool = 32
> frame len = 72
> Using address: 00:0D:44:2A:09:00
> 
> I started to do something else, and now even after power cycling,
> relinking, it's not playing anymore.
> 
> Wow. Any idea on that strange beast?
> 
> PS: I was suggested to try to record a session of normal audio
> interaction. How can it be done? I'll try to borrow a frieds ipaq and
> see how it is supposed to work.

does somebody wants to donate one of these to me? Then I can start
looking what's the problem with them. I think our AVDTP implementation
is not quite right and needs some more work at the timing part of the
stream sending.

Regards

Marcel




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Re: [Bluez-devel] Hp bluetooth headset a2dp

[Guylhem Aznar]

On Thursday, 24 March 2005 at 18:04:22 (+0100), Marcel Holtmann wrote:
> does somebody wants to donate one of these to me? Then I can start

Unfortunately I only have one. I could hardly purchase it after days of l=
ooking for one - such a2dp devices are not very frequent :-(

So I can lend it to how as long as you want, but I'd like it back
someday :-)

Send me your address...

--=20
Bien =E0 vous - Best regards,
Guylhem P. Aznar

--=20
*@externe.net                                            http://externe.n=
et
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un.org
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Re: [Bluez-devel] Hp bluetooth headset a2dp

[Guylhem Aznar]

On Thursday, 24 March 2005 at 11:56:47 (-0500), Guylhem Aznar wrote:
> I started to do something else, and now even after power cycling,
> relinking, it's not playing anymore.

More details - I was using a different test file, to try to record it
on the receiving end and compare it to the source (maybe there're
recongnisable patterns in the acceleration sequence?)

My test file was a metronome (tick tick tick etc.) at 11050 Mhz which
seems to have caused that problem. After refusing to play at that
frequency, it refuses everything else.  It seems to be able to play
again but only after power cycling.

With the bad mp3:

MPEG 2.5 layer III, 32 kbit/s, 11025 Hz mono
subbands =3D 0
allocation method =3D 0
channel_mode =3D 0
blocks =3D 0
sampling frequency =3D 0
bitpool =3D 0
frame len =3D 2
Using address: 00:0D:44:2A:09:00
Found A2DP Sink
Connected [imtu 672, omtu 672, flush_to 65535]
got capabilities response
headset does not support this frequency
sent set_config
set config rejected
couldn't locate the correct seid

Then afterwards:

subbands =3D 1
allocation method =3D 1
channel_mode =3D 2
blocks =3D 3
sampling frequency =3D 2
bitpool =3D 32
frame len =3D 72
Using address: 00:0D:44:2A:09:00
Found A2DP Sink
Connected [imtu 672, omtu 672, flush_to 65535]
got capabilities response
sent set_config
set config rejected
couldn't locate the correct seid

That's using the very same mp3 that was accepted before. I think it
may need to be told that this one was using a different frequency.

Regarding the 10 s metronome mp3, after playing it many many times I
realised that:
 - the audio was a little bit faster approx 50% of the time
 - it was a little big slower maybe 20% of the time, an normal 30%
 - it was changing during a playback session, with accelerations and
   decelerations. These changes of pace seems to follow a pattern : in
a 10 s sample, 2 sec to slow, 1 normal, 7 too fast - that's the most
frequent pattern I get, with rates of accelerations varying depending
on the samples.

However during a longer mp3 playback, I had phases of acceleration and
deceleration. I don't have a metronome mp3 longer than 10s, so I'm
unable to document that. However I hope this data will help fixing
a2play.


--=20
Bien =E0 vous - Best regards,
Guylhem P. Aznar

--=20
*@externe.net                                            http://externe.n=
et
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