2006-11-10 08:41:10

by Frédéric DALLEAU

[permalink] [raw]
Subject: [Bluez-devel] RE : Quality of a2dp sound

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2006-11-14 15:40:30

by Sergey Krivov

[permalink] [raw]
Subject: Re: [Bluez-devel] python a2dp


get it from http://org.csail.mit.edu/pybluez/

sorry, i probably should have it written in the file.

--- Fr=E9d=E9ric DALLEAU <[email protected]>
wrote:

> Hi,
> =

> Got the same error for c_uint16 and c_uint32
> Now, I'm stuck with that one :
> =

> Traceback (most recent call last):
> File "./avdtp.py", line 50, in ?
> import bluetooth
> ImportError: No module named bluetooth
> =

> I fear this one won't be solved the same way : where
> to find the module?
> =

> Frederic.
> =

> =

> Sergey Krivov a =E9crit :
> > Hi, Fr=E9d=E9ric,
> >
> > =

> >> I just installed the ctypes my ubuntu provides
> >> (0.9.6) but I get the =

> >> following error :
> >>
> >> Traceback (most recent call last):
> >> File "./avdtp.py", line 49, in ?
> >> from ctypes import
> >>
> Structure,c_uint8,c_uint16,c_ulong,c_uint32,c_void_p
> >> ImportError: cannot import name c_uint8
> >> =

> >
> > i am using ctypes 1.0.0-1 on fedora core 6.
> > c_uint8 is an alias for c_byte
> > to avoid replacing c_uint8 with c_byte in the code
> > import c_byte instead c_uint8 and put afterwords
> > c_uint8=3Dc_byte
> >
> >
> >
> > =

> >
>
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> =

> =

>
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2006-11-14 15:34:59

by Frédéric DALLEAU

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Subject: Re: [Bluez-devel] python a2dp

Hi,

Got the same error for c_uint16 and c_uint32
Now, I'm stuck with that one :

Traceback (most recent call last):
File "./avdtp.py", line 50, in ?
import bluetooth
ImportError: No module named bluetooth

I fear this one won't be solved the same way : where to find the module?

Frederic.


Sergey Krivov a =E9crit :
> Hi, Fr=E9d=E9ric,
>
> =

>> I just installed the ctypes my ubuntu provides
>> (0.9.6) but I get the =

>> following error :
>>
>> Traceback (most recent call last):
>> File "./avdtp.py", line 49, in ?
>> from ctypes import
>> Structure,c_uint8,c_uint16,c_ulong,c_uint32,c_void_p
>> ImportError: cannot import name c_uint8
>> =

>
> i am using ctypes 1.0.0-1 on fedora core 6.
> c_uint8 is an alias for c_byte
> to avoid replacing c_uint8 with c_byte in the code
> import c_byte instead c_uint8 and put afterwords
> c_uint8=3Dc_byte
>
>
>
> =

> _________________________________________________________________________=
___________
> Do you Yahoo!?
> Everyone is raving about the all-new Yahoo! Mail beta.
> http://new.mail.yahoo.com
>
> -------------------------------------------------------------------------
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> Get stuff done quickly with pre-integrated technology to make your job ea=
sier
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=3D121642
> _______________________________________________
> Bluez-devel mailing list
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> =



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2006-11-14 15:25:39

by Sergey Krivov

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Subject: Re: [Bluez-devel] python a2dp

Hi, Fr=E9d=E9ric,

> I just installed the ctypes my ubuntu provides
> (0.9.6) but I get the =

> following error :
> =

> Traceback (most recent call last):
> File "./avdtp.py", line 49, in ?
> from ctypes import
> Structure,c_uint8,c_uint16,c_ulong,c_uint32,c_void_p
> ImportError: cannot import name c_uint8

i am using ctypes 1.0.0-1 on fedora core 6.
c_uint8 is an alias for c_byte
to avoid replacing c_uint8 with c_byte in the code
import c_byte instead c_uint8 and put afterwords
c_uint8=3Dc_byte



=

___________________________________________________________________________=
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Everyone is raving about the all-new Yahoo! Mail beta.
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2006-11-14 14:40:51

by Frédéric DALLEAU

[permalink] [raw]
Subject: Re: [Bluez-devel] python a2dp

Hi Sergey,

This is interesting!
I don't know much about python so I'm having a few problems to make it run.
I just installed the ctypes my ubuntu provides (0.9.6) but I get the =

following error :

Traceback (most recent call last):
File "./avdtp.py", line 49, in ?
from ctypes import Structure,c_uint8,c_uint16,c_ulong,c_uint32,c_void_p
ImportError: cannot import name c_uint8

Any ideas?

Thank you,
Fr=E9d=E9ric.

Sergey Krivov a =E9crit :
> Hi,
>
> this is a partial realization of AVDTP, A2DP and AVRCP
> profiles in python with simple example of a2dp-avrcp
> server. it is probably far from a2dp alsa-plugin theme
> since it is not written in C, but it might be useful
> for prototype development. Anyway, have a look.
>
> All the feedback is welcome.
> =



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2006-11-13 18:37:02

by Reiner Klenk

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Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

On Sun, 2006-11-12 at 19:38 +0100, Marcel Hilzinger wrote:

>
> Thanks a lot for these explanations. I knew, that sco and a2dp are different
> profiles, but I didn not know, that the kernel module handles "only" sco,
> because the command to play is called a2play...
>
??
snd-bt-sco and running btsco => SCO (bi-directional)

a2play, a2dp alsa plugin, a2dpd => three different possibilities for
a2dp (one-way)

> Btw. is there a possibitily to use the micro under Linux or is a2dpd a
> one-way-connection?
>
It can be used in SCO connections, for example with ekiga.

> > To use "old-style" a2dp with amarok:
> > .asoundrc like this:
> >
> > pcm.headphone {
> > type a2dp
> > bdaddr "00:13:17:71:58:F6"
> > }
> >
> > Note the a2dp in the second line (not a2dpd). Replace the address with
> > the one of your headset. Do _not_ run the a2dpd daemon.
> But load the kernel module?
>
Can be loaded, but is not required for a2dp.


--
debb1046 (gmail.com, gtalk, jabber.org, ekiga.net, last.fm, skype)


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2006-11-13 18:26:40

by Reiner Klenk

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

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2006-11-13 13:24:05

by Marcel Hilzinger

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

Am Freitag, 10. November 2006 11:17 schrieb Marcel Hilzinger:
> Am Freitag, 10. November 2006 09:41 schrieb Frederic Dalleau:
> > Hi,
> >
> > > a2dpd produces some noise in the background. If there is silence, you
> > > can hear it. With a2play there is no noise. I will checkout cvs again
> > > and have a look.
>
> One more (maybe last :-) feedback
Never say never again...

I'm now testing the 3th day, whole day with bt phones on my head. A new =

problem, which appears at least with amarok, maybe also with xmms: The spee=
d =

of the played sound is not constant. It's like augmenting the speed on a =

oldstyle turntable from 33 1/2 to 35, back to 31 and back to 33 1/2 again. =

First I thought it's due to heavy CPU load, but it seems to appear randomly=
. =

I decreased the sbcbitpool=3D value from 64 to 32 and it's seems to be bett=
er, =

but perhaps it's only because I restartet a2dpd. =


It seems to be a caching problem.

In my first tests I had the same, when I went far away from the dongle, so =

playback stopped and then came back. Sound was played very quickly, and the=
n =

normal again. But I then had no up-and-down-effects like today.


-- =

Mit freundlichen Gr=FC=DFen,
Marcel Hilzinger

Linux New Media AG
S=FCskindstr. 4
D-81929 M=FCnchen
Tel: +49 (89) 99 34 11 0
Fax: +49 (89) 99 34 11 99

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2006-11-13 09:39:07

by Frédéric DALLEAU

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

Hi,
>> BTW: Has your head band snapped on the logitech already?
>>
I've an HP set than looks exactly like the Logitech one, but in black.
The band of plastic between the two speakers is broken. Is it what you mean?
BR, Frederic



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2006-11-12 20:31:04

by Brad Midgley

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Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

Marcel

> Btw. is there a possibitily to use the micro under Linux or is a2dpd a
> one-way-connection?

All the combo sco/a2dp headphones I've seen only use the microphone for
plain sco--they disable the microphone when a2dp audio is streaming.

The a2dp spec leaves it open for implementors to work in the mic by
doing both a2dp source and sink, but the latency in practice for a2dp is
around 250ms. It would be pretty awful for voip to add that in both
directions.

Brad

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2006-11-12 18:38:39

by Marcel Hilzinger

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

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ZXotZGV2ZWwK

2006-11-11 08:21:19

by Reiner Klenk

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

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aXN0aW5mby9ibHVlei1kZXZlbAo=

2006-11-10 10:17:30

by Marcel Hilzinger

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

Am Freitag, 10. November 2006 09:41 schrieb Frederic Dalleau:
> Hi,
>
> > a2dpd produces some noise in the background. If there is silence, you c=
an
> > hear it. With a2play there is no noise. I will checkout cvs again and
> > have a look.
One more (maybe last :-) feedback

With amarok and a2dpd I can only use the Jabra headset. The Logitech one su=
cks =

(plays the songs at least twice as fast as wanted).


Mit freundlichen Gr=FC=DFen,
Marcel Hilzinger

Linux New Media AG
S=FCskindstr. 4
D-81929 M=FCnchen
Tel: +49 (89) 99 34 11 0
Fax: +49 (89) 99 34 11 99

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easi=
er
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D1=
21642
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2006-11-10 10:06:38

by Marcel Hilzinger

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

Am Freitag, 10. November 2006 09:41 schrieb Frederic Dalleau:
> Hi,
>
> > a2dpd produces some noise in the background. If there is silence, you c=
an
> > hear it. With a2play there is no noise. I will checkout cvs again and
> > have a look.
>
> I believe this comes from a difference in the sbc encoder (floating vs
> fixed). If you have the latest patch, I would first suggest you increase
> sbcbitpool=3D64 in .a2dprc. If it doesn't work, then the dirty way is to =
swap
> all files from sbc/lib with the corresponding in btsco/sbc and then rebui=
ld
> sbc library and reinstall of course.
I forgot to mention that I use xmms and amarok for the tests.

Important: the noise seems to depend on the soundfile. With some files (mos=
tly =

crappy MP3) the noise difference between bluetooth and conventional wireles=
s =

is quite big. With other files (flac and high quality OGG), there is almost =

no noise difference.

Maybe that's all irrelevant, but theese are my observations.

-- =

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

-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easi=
er
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D1=
21642
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2006-11-10 10:04:13

by Marcel Hilzinger

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

Am Freitag, 10. November 2006 10:59 schrieb Mayank BATRA:
> Hi Marcel,
>
> > I also tried to call mpg123 --au -file.mp3 | a2play 00:0D:44:58:11:CA
> >
> > without calling btsco before, and it's works, too. But here i
> > have the effects
> > other user described with speedup and very noisy sound. So
> > maybe this is a
> > pairing problem? See logs at the end of my email.
>
> Why don't you try running a2play with -p option?
> Something like:
> mpg123 --au - file.mp3 | a2play -p 00:0D:44:58:11:CA
>
> This surely will correct the speedup.

No, it doesn't. But this is not the way to go anyway. a2dpd is the future, =

yeah ;-) =


I also tried different sampling rates. But the result is alwas the same noi=
se, =

only played at a different octave :-)

-- =

Mit freundlichen Gr=FC=DFen,
Marcel Hilzinger

Linux New Media AG
S=FCskindstr. 4
D-81929 M=FCnchen
Tel: +49 (89) 99 34 11 0
Fax: +49 (89) 99 34 11 99

-------------------------------------------------------------------------
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Get stuff done quickly with pre-integrated technology to make your job easi=
er
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2006-11-10 09:59:57

by Mayank BATRA

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

Hi Marcel,

> I also tried to call mpg123 --au -file.mp3 | a2play 00:0D:44:58:11:CA
>
> without calling btsco before, and it's works, too. But here i
> have the effects
> other user described with speedup and very noisy sound. So
> maybe this is a
> pairing problem? See logs at the end of my email.

Why don't you try running a2play with -p option?
Something like:
mpg123 --au - file.mp3 | a2play -p 00:0D:44:58:11:CA

This surely will correct the speedup.


Best Regards,

Mayank


-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
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2006-11-10 09:46:02

by Marcel Hilzinger

[permalink] [raw]
Subject: Re: [Bluez-devel] RE : Quality of a2dp sound

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