[Bluez-devel] A2DP btsco support

[Bluez-devel] A2DP btsco support

[Manuel Harnisch]

Hi,

I have a pair of HP bluetooth headphones and I've done some testing with them 
together with the btsco/a2play project. The bottom line is that they do work, 
I've got stereo sound, but there is a problem with the timing. It is 
significantly related to how well the bluetooth reception is. I get the best 
results around an lq of 207 (hcitool lq BDDR).
I've had contact with Brad Midgley before and he recommend to post this issue 
here. I am not a coder, but I've some basic understanding of C/C++, that's 
about it. I wouldn't even know where to look for the timing related code.
I'd like to offer to test any new code.

Thanks,
Manuel


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Re: [Bluez-devel] A2DP btsco support

[Marcel Holtmann]

Hi Manuel,

> I have a pair of HP bluetooth headphones and I've done some testing with them 
> together with the btsco/a2play project. The bottom line is that they do work, 
> I've got stereo sound, but there is a problem with the timing. It is 
> significantly related to how well the bluetooth reception is. I get the best 
> results around an lq of 207 (hcitool lq BDDR).
> I've had contact with Brad Midgley before and he recommend to post this issue 
> here. I am not a coder, but I've some basic understanding of C/C++, that's 
> about it. I wouldn't even know where to look for the timing related code.
> I'd like to offer to test any new code.

the goal will be to go for a direct ALSA plugin, but my Aiptek is not
really conforming to the A2DP specification. This means that I don't
have any headphone to really work with and thus I can't solve this
issue.

Regards

Marcel




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Re: [Bluez-devel] A2DP btsco support

[Manuel Harnisch]

Marcel,

If I wouldn't be a bit short on cash right now, I'd donate a pair of HP 
headphones to the project. They are only about $99 here in the US... but I 
really can't afford that right now... maybe in a couple of weeks...

Manuel

On Saturday 26 March 2005 10:39 pm, Marcel Holtmann wrote:
> Hi Manuel,
>
> > I have a pair of HP bluetooth headphones and I've done some testing with
> > them together with the btsco/a2play project. The bottom line is that they
> > do work, I've got stereo sound, but there is a problem with the timing.
> > It is significantly related to how well the bluetooth reception is. I get
> > the best results around an lq of 207 (hcitool lq BDDR).
> > I've had contact with Brad Midgley before and he recommend to post this
> > issue here. I am not a coder, but I've some basic understanding of C/C++,
> > that's about it. I wouldn't even know where to look for the timing
> > related code. I'd like to offer to test any new code.
>
> the goal will be to go for a direct ALSA plugin, but my Aiptek is not
> really conforming to the A2DP specification. This means that I don't
> have any headphone to really work with and thus I can't solve this
> issue.
>
> Regards
>
> Marcel
>
>
>
>
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> SF email is sponsored by - The IT Product Guide
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-- 
Manuel Harnisch, IntellinetServices
Systems Administrator &
Web Developer

Mobile: (267) 237-7080
Email: mh@intellinetservices.net


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Re: [Bluez-devel] A2DP btsco support

[Guylhem Aznar]

On Sunday, 27 March 2005 at  5:39:47 (+0200), Marcel Holtmann wrote:
> the goal will be to go for a direct ALSA plugin, but my Aiptek is not
> really conforming to the A2DP specification. This means that I don't
> have any headphone to really work with and thus I can't solve this
> issue.

I recommand keeping standalone sbc encoder and a2play, at least for
those who want to use such headphones with linux PDAs (I do !)

BTW I did report somes bug and proposed fixes when I was compiling
with gcc 2.95 for ARM. Did they make it in?

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

--=20
*@externe.net                                            http://externe.n=
et
P=E9rim=E9/Deprecated:    @oeil.qc.ca, @metalab.unc.edu, @ibiblio.org, @7=
un.org
GPG: 92EB37C1 DD11C9C9 20519D01 E8FA1B11 42975AF7 http://externe.net/pubk=
ey


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Re: [Bluez-devel] A2DP btsco support

[Marcel Holtmann]

Hi Guylhem,

> > the goal will be to go for a direct ALSA plugin, but my Aiptek is not
> > really conforming to the A2DP specification. This means that I don't
> > have any headphone to really work with and thus I can't solve this
> > issue.
> 
> I recommand keeping standalone sbc encoder and a2play, at least for
> those who want to use such headphones with linux PDAs (I do !)

we will see, but the goal should be still an integration into the sound
system. And this is ALSA at the moment.

> BTW I did report somes bug and proposed fixes when I was compiling
> with gcc 2.95 for ARM. Did they make it in?

I haven't seen any. Resend them.

Regards

Marcel




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Re: [Bluez-devel] A2DP btsco support

[Brad Midgley]

Guylhem

> I recommand keeping standalone sbc encoder and a2play, at least for
> those who want to use such headphones with linux PDAs (I do !)

the problem here is there is one way to fix timing issues in a2play and 
a different solution for timing issues in an alsa userspace plugin. if 
it's important to someone, it will be maintained of course.

i've been hoping a company would see potential in this stuff and throw 
in some resources. during the .com boom it would have happened :(

> BTW I did report somes bug and proposed fixes when I was compiling
> with gcc 2.95 for ARM. Did they make it in?

i think so. check cvs to see if it all looks good.

thanks
brad


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