[Bluez-devel] Quality of a2dp sound

[Bluez-devel] Quality of a2dp sound

[Marcel Hilzinger]

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Re: [Bluez-devel] Quality of a2dp sound

[Adrian Glaubitz]

Hi Marcel !

Marcel Hilzinger schrieb:
> Hi,
> =

> I made some tests with bluetooth stereo headsets and a2dpd. =

> I must confess, I'm impressed by the easy use of a2dpd! Thanks, it's just =

> great. =


Yes, the usage is very simple, indeed. Once I figured out how to use
passkey-agent, the connection worked immediately ;).

> =

> But I'm not impressed by the audio quality. Its quite noisy and far away =
from =

> the quality of normal wireless headphones. Headset was a Jabra BT620s. I =

> tried with different dongles, but the dongle seems to make no difference.

My problem with the audio quality and a2dpd is, that the quality is set
to telephone quality only (8kHz, Mono) though my headset can do up to
44,1kHz Stereo (SONY VGP-BRM1D) and a2dpd even displays 44,1kHz. When
using a2play I can listen in 44,1kHz quality, so this is an issue with a2dpd
for me (but a2play plays the MP3s with higher speed, so they sound
high-pitched). Also the sound is chopped very often with a2dpd, so this is =
no use for me
at the moment :(.

> =

> Questions: =

> is this a problem of the technology?

I don't think so, this is rather due to the fact that btsco is still in
Alpha status of development.

> is it a problem of bluez?

No, I'd rather blame btsco. (I tried different kernel versions, 2.6.17.9
and 2.6.19-rc5 and the most recent bluez-utils version).

> did I something wrong?

Have you tried a2play instead ? Do this:

- hcitool scan
- passkey-agent <code> <address>
- btsco -r -v <address>
- mpg123 --au - file.mp3 | a2play <address>

> =

> did anybody compare the quality on Windows? I tried to compare with Mac. =
But =

> as Mac OS X cannot do a2dpd, it's even worse on Mac.


I was not able to use my headset in Windows, Windows doesn't give me any
options for choosing the headset as an audio output-device, though I can
to the headset successfully. On 2 Macintosh Mini (Intel and PPC) with OS 10=
.4
I was able to connect to the headset without any problems, and I could
choose my headset for all the sound-output so I was able to listen to
iTunes via the headset. The only drawback on the Mac is, that the
quality is limited to 8000Hz, 16 Bit mono (and the Audio Utility won't
let me choose any better quality, though the headset supports this).

> =

> Regards,
> -- =

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


Greetings,

Adrian

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Re: [Bluez-devel] Quality of a2dp sound

[Reiner Klenk]

Hi,
I'm also using a BT620s and I find the sound quality acceptable using
the a2dp plugin. I also tested with a2dpd and there wasn't any
difference in sound quality that I could perceive. However, with a2dp,
which I'm using with amarok I can actually play mono/stereo sources with
different sample rates without getting the pitch problem (Frederic has
submitted patches for a2dpd recently but I haven't tested them yet). I'm
using a 100 mW dongle and there are no drop-outs within my (not too big)
appartment. It seems to be fairly stable, I have used the headset for
hours without a glitch.
What I did notice is that the volume could be higher and there is the
occasional faint clicking which might be due to clipping. As far as I
understood these are known issues inside the sbc encoding library.
Of course, headsets like the BT620s can be connected via SCO as well as
a2dp. Use SCO to hook it up to your phone or to egika, but definitly use
a2dp for the connection to amarok or other music/podcast players.

Regards,
Reiner   



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Re: [Bluez-devel] Quality of a2dp sound

[Marcel Hilzinger]

Am Donnerstag, 9. November 2006 11:07 schrieb Reiner Klenk:
> Hi,
> I'm also using a BT620s and I find the sound quality acceptable using
> the a2dp plugin. I also tested with a2dpd and there wasn't any
> difference in sound quality that I could perceive. =

Then we must have different ears :-) or different versions. I'm using Suse =

Linux 10.1 with kernel 2.6.16.21, alsa-version is 1.0.13

a2dpd produces some noise in the background. If there is silence, you can h=
ear =

it. With a2play there is no noise. I will checkout cvs again and have a loo=
k.

> However, with a2dp, =

> which I'm using with amarok I can actually play mono/stereo sources with
> different sample rates without getting the pitch problem (Frederic has
> submitted patches for a2dpd recently but I haven't tested them yet).
How do you change the sample rate?

> I'm =

> using a 100 mW dongle and there are no drop-outs within my (not too big)
> appartment. It seems to be fairly stable, I have used the headset for
> hours without a glitch.
> What I did notice is that the volume could be higher and there is the
> occasional faint clicking which might be due to clipping. As far as I
> understood these are known issues inside the sbc encoding library.
> Of course, headsets like the BT620s can be connected via SCO as well as
> a2dp. Use SCO to hook it up to your phone or to egika, but definitly use
> a2dp for the connection to amarok or other music/podcast players.
>
> Regards,
> Reiner
>
>
>
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=3D121642
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> https://lists.sourceforge.net/lists/listinfo/bluez-devel

-- =

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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[Bluez-devel] RE : Quality of a2dp sound

[Frederic Dalleau]

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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.

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=64 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 rebuild sbc library and reinstall of course.

BTW, do you have choppy sound like Adrian? Which player is it?

BR, Frederic

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

[Marcel Hilzinger]

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bmZvL2JsdWV6LWRldmVsCg==

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

[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.


Best Regards,

Mayank


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

[Marcel Hilzinger]

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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er
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21642
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Re: [Bluez-devel] RE : Quality of a2dp sound

[Reiner Klenk]

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

[Marcel Hilzinger]

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LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t
ClVzaW5nIFRvbWNhdCBidXQgbmVlZCB0byBkbyBtb3JlPyBOZWVkIHRvIHN1cHBvcnQgd2ViIHNl
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dGVkIHRlY2hub2xvZ3kgdG8gbWFrZSB5b3VyIGpvYiBlYXNpZXIKRG93bmxvYWQgSUJNIFdlYlNw
aGVyZSBBcHBsaWNhdGlvbiBTZXJ2ZXIgdi4xLjAuMSBiYXNlZCBvbiBBcGFjaGUgR2Vyb25pbW8K
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MzA1NyZkYXQ9MTIxNjQyCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fCkJsdWV6LWRldmVsIG1haWxpbmcgbGlzdApCbHVlei1kZXZlbEBsaXN0cy5zb3VyY2Vm
b3JnZS5uZXQKaHR0cHM6Ly9saXN0cy5zb3VyY2Vmb3JnZS5uZXQvbGlzdHMvbGlzdGluZm8vYmx1
ZXotZGV2ZWwK

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

[Brad Midgley]

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

[Frédéric DALLEAU]

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

[Reiner Klenk]

T24gTW9uLCAyMDA2LTExLTEzIGF0IDEwOjM5ICswMTAwLCBGcsOpZMOpcmljIERBTExFQVUgd3Jv
dGU6Cj4gSGksCj4gPj4gQlRXOiBIYXMgeW91ciBoZWFkIGJhbmQgc25hcHBlZCBvbiB0aGUgbG9n
aXRlY2ggYWxyZWFkeT8KPiA+PiAgICAgCj4gSSd2ZSBhbiBIUCBzZXQgdGhhbiBsb29rcyBleGFj
dGx5IGxpa2UgdGhlIExvZ2l0ZWNoIG9uZSwgYnV0IGluIGJsYWNrLiAKPiBUaGUgYmFuZCBvZiBw
bGFzdGljIGJldHdlZW4gdGhlIHR3byBzcGVha2VycyBpcyBicm9rZW4uIElzIGl0IHdoYXQgeW91
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IHRoZSBMb2dpdGVjaApoZWFkcGhvbmVzLiAKClJlZ2FyZHMsClJlaW5lcgoKLS0gCmRlYmIxMDQ2
IChnbWFpbC5jb20sIGd0YWxrLCBqYWJiZXIub3JnLCBla2lnYS5uZXQsIGxhc3QuZm0sIHNreXBl
KQoKCi0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t
LS0tLS0tLS0tLS0tLS0tLS0tLS0KVXNpbmcgVG9tY2F0IGJ1dCBuZWVkIHRvIGRvIG1vcmU/IE5l
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IG9uIEFwYWNoZSBHZXJvbmltbwpodHRwOi8vc2VsLmFzLXVzLmZhbGthZy5uZXQvc2VsP2NtZD1s
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LWRldmVsQGxpc3RzLnNvdXJjZWZvcmdlLm5ldApodHRwczovL2xpc3RzLnNvdXJjZWZvcmdlLm5l
dC9saXN0cy9saXN0aW5mby9ibHVlei1kZXZlbAo=

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

[Reiner Klenk]

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

[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 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

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

[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 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

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

[Marcel Hilzinger]

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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[Bluez-devel] python a2dp

[Sergey Krivov]

[-- Attachment #1: Type: text/plain, Size: 472 bytes --]

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.


 
____________________________________________________________________________________
Yahoo! Music Unlimited
Access over 1 million songs.
http://music.yahoo.com/unlimited

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: 831489387-avdtp.py --]
[-- Type: text/x-python; name="avdtp.py", Size: 21091 bytes --]

#! /usr/bin/env python
"""
Partial realization of AVDTP, A2DP and AVRCP profiles
and simple A2DP-AVRCP server

*  Copyright (C) 2006  Sergei Krivov <krivov@yahoo.com>
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""


"""
install libsbc; check for /usr/lib/libsbc.so. http://sbc.sf.net
put this in your .asoundrc file
pcm.a2dpipe {
            type plug
            slave {
                  pcm "tee:default,'/tmp/a2dpipe', raw"
            }
}

select alsa output pcm device a2dpipe
make pipe by: mkfifo /tmp/a2dpipe
start by python avdtp.py
stop by killing the process
A2DP server can work with many ACP given in the beginning.
dynamical management of ACP is restricted to a single ACP
to initiate connection with the server press PLAY button on headphones
server starts as soon as some sound appeared in the pipe.
server uses alsa timing, so some dropouts can be experienced if timing
in alsa and headphones is different.
"""



import ctypes
from ctypes import Structure,c_uint8,c_uint16,c_ulong,c_uint32,c_void_p
import bluetooth
import struct
import time
import sys
import array
import os
import threading

#//Signal ids
AVDTP_DISCOVER=1
AVDTP_GET_CAPABILITIES=2
AVDTP_SET_CONFIGURATION=3
AVDTP_GET_CONFIGURATION=4
AVDTP_RECONFIGURE=5
AVDTP_OPEN =6
AVDTP_START =7
AVDTP_CLOSE =8
AVDTP_SUSPEND =9
AVDTP_ABORT =10
AVDTP_SECURITY_CONTROL =11

MEDIA_TRANSPORT_CATEGORY =1
MEDIA_CODEC =7

SBC_MEDIA_CODEC_TYPE =0
AUDIO_MEDIA_TYPE =0

#//Packet types
PACKET_TYPE_SINGLE =0
PACKET_TYPE_START =1
PACKET_TYPE_CONTINUE =2
PACKET_TYPE_END =3

#//Message Types
MESSAGE_TYPE_COMMAND =0
MESSAGE_TYPE_ACCEPT =2
MESSAGE_TYPE_REJECT =3

MEDIA_PACKET_HEADER_LENGTH =14
MAX_ADDITIONAL_CODEC=4

deb=1
tran=0

class message_header_single(Structure):
  _pack_=1
  _fields_=[("message_type",c_uint8,2),("packet_type",c_uint8,2)\
    ,("transaction_label",c_uint8,4),("signal_id",c_uint8,6),("rfa0",c_uint8,2)]
class message_header_start(Structure):
  _pack_=1
  _fields_=[("message_type",c_uint8,2),("packet_type",c_uint8,2),("nsop",c_uint8,8)\
    ,("transaction_label",c_uint8,4),("signal_id",c_uint8,6),("rfa0",c_uint8,2)]
class message_header_continue(Structure):
  _pack_=1
  _fields_=[("message_type",c_uint8,2),("packet_type",c_uint8,2)\
    ,("transaction_label",c_uint8,4)]
class message_single(Structure):
  _pack_=1
  _fields_=[("header",message_header_single),("rfa0",c_uint8,2),("acp_seid",c_uint8,6)]
class sbc_codec_elements(Structure):
  _pack_=1
  _fields_=[("channel_mode",c_uint8,4),("frequency",c_uint8,4)\
    ,("allocation_method",c_uint8,2),("subbands",c_uint8,2)\
    ,("block_length",c_uint8,4),("min_bitpool",c_uint8,8),("max_bitpool",c_uint8,8)]
class acp_seid_info(Structure):
  _pack_=1
  _fields_=[("rfa0",c_uint8,1),("inuse",c_uint8,1),("acp_seid",c_uint8,6)\
    ,("rfa1",c_uint8,3),("tsep",c_uint8,1),("media_type",c_uint8,4)]
class sepd_resp(Structure):
  _pack_=1
  _fields_=[("header",message_header_single)]
  for i in range(1+MAX_ADDITIONAL_CODEC):_fields_.append(("n%i" %(i),acp_seid_info))
class sepd_reject(Structure):
  _pack_=1
  _fields_=[("header",message_header_single),("error",c_uint8)]
class getcap_resp(Structure):
  _pack_=1
  _fields_=[("header",message_header_single)]
  for s in ("serv_cat","serv_cap_len","cap_type","length","media_type"\
    ,"media_codec_type"): _fields_.append((s,c_uint8,8))
  _fields_.append(("sbc_elements",sbc_codec_elements))  
class set_sbc_req(Structure):
  _pack_=1
  _fields_=[("header",message_header_single),("rfa0",c_uint8,2)\
    ,("acp_seid",c_uint8,6),("rfa1",c_uint8,2),("int_seid",c_uint8,6)]
  for s in ("serv_cap","serv_cap_len","cap_type","length","media_type"\
    ,"media_codec_type"): _fields_.append((s,c_uint8,8))
  _fields_.append(("sbc_elements",sbc_codec_elements))  
class set_sbc_resp(Structure):
  _pack_=1
  _fields_=[("header",message_header_single),("serv_cap",c_uint8,8),("acp_seid",c_uint8,8)]
class open_strm_resp(Structure):
  _pack_=1
  _fields_=[("header",message_header_single),("error",c_uint8,8)]
class start_strm_resp(Structure):
  _pack_=1
  _fields_=[("header",message_header_single),("rfa0",c_uint8,2),("acp_seid",c_uint8,6)\
    ,("error",c_uint8,8)]

def print_fields(st,gap=''):
  print gap+str(st.__class__)+':'
  for f in st._fields_:
    a=st.__getattribute__(f[0])
    try:
      b=a.__getattribute__("_fields_")
      print f[0]+":"
      print_fields(a,gap+'  ')
    except: print gap+str(f[0]),a
    


def avdtp_connect(dst,psm=25):
  sock=bluetooth.BluetoothSocket( bluetooth.L2CAP )
  sock.bind(("",psm))
  sock.connect((dst,psm))
  if deb: print "connected to ",dst,psm
  bluetooth.set_l2cap_mtu(sock,672)
  return sock

def avdtp_disconnect(sock):
  sock.close()


def init_command_single(req):
  global tran
  req.header.packet_type=PACKET_TYPE_SINGLE
  req.header.message_type=MESSAGE_TYPE_COMMAND
  req.header.transaction_label=tran
  req.header.rfa0=0
  tran=(tran+1) & 0xf
  return req

def send_packet(sock,packet):
  size=ctypes.sizeof(packet)
  if deb>1:
    print "sending packet",size,struct.unpack("%iB" %(size),packet)
    print_fields(packet)
  l=sock.send(packet)
  if l!=size: raise IOError('transmission error')
  
  
def receive_response(sock,resp_class,resp_error_class=None):
  data=sock.recv(1024)
  size=ctypes.sizeof(resp_class)
  if len(data)>size:
    if deb>1:print "warning, possibly wrong responce class ",len(data),size
  if len(data)<size:
    if deb>1:print "warning, got partial responce, pad with zeros",len(data),size
    dl=size-len(data)
    l0=[0 for i in range(dl)]
    data+=struct.pack("%iB" %(dl),*l0)
  resp=ctypes.cast(data,ctypes.POINTER(resp_class))
  resp=resp.contents
  if deb>1:
    print "received",struct.unpack("%iB" %(len(data)),data)
    print_fields(resp)
  return resp


def avdtp_get_capabilities(sock,seid):
  cmd=message_single()
  cmd=init_command_single(cmd)
  cmd.header.signal_id=AVDTP_GET_CAPABILITIES
  cmd.acp_seid=seid
  send_packet(sock,cmd)
  resp=receive_response(sock,getcap_resp)
  return resp

def avdtp_discover(sock):
  cmd=message_single()
  cmd=init_command_single(cmd)
  cmd.header.signal_id=AVDTP_DISCOVER
  send_packet(sock,cmd)
  resp=receive_response(sock,sepd_resp)
  lseid=[]
  for i in range(1+MAX_ADDITIONAL_CODEC):
    sep=resp.__getattribute__("n%i" %(i))
    seid=sep.acp_seid
    if seid:lseid.append(seid) # take non zero seid
  if deb:print "got %i seid" %(len(lseid))
  lsep=[(avdtp_get_capabilities(sock,seid),seid) for seid in lseid]  
  return lsep

def avdtp_discover_rsp(sock):
  global tran
  cmd=receive_response(sock,message_single)
  tran=cmd.header.transaction_label
  rsp=sepd_resp()
  rsp=init_command_single(rsp)
  rsp.header.message_type=MESSAGE_TYPE_ACCEPT
  rsp.header.signal_id=AVDTP_DISCOVER
  sbc=rsp.n0
  sbc.acp_seid=1
  sbc.inuse=0
  sbc.tsep=1
  sbc.media_type=SBC_MEDIA_CODEC_TYPE
  send_packet(sock,rsp)


def set_sbc_configuration(sock,capb_resp,seid,sbc_codec):
  cmd=set_sbc_req()
  cmd=init_command_single(cmd)
  cmd.header.signal_id=AVDTP_SET_CONFIGURATION
  cmd.serv_cap=MEDIA_TRANSPORT_CATEGORY
  cmd.acp_seid=seid
  cmd.int_seid=1
  cmd.cap_type=MEDIA_CODEC
  cmd.length=6
  cmd.media_type=AUDIO_MEDIA_TYPE  
  cmd.media_codec_type=SBC_MEDIA_CODEC_TYPE
  cmd.sbc_elements=capb_resp.sbc_elements
  cmd.sbc_elements.allocation_method=2
#  values of parameters in sbc routine and here are different
  for par,vals in sbc_codec.conf_dict.items():
    codec_att=sbc_codec.par.__getattribute__(par)
    code=vals[codec_att]
    resp_att=capb_resp.sbc_elements.__getattribute__(par)
    if resp_att & code:
      if deb: print 'setting %s=%i, %i' %(par,code,codec_att)
      cmd.sbc_elements.__setattr__(par,code)
    else: 
      if deb: print 'can not set %s=%i, %i' %(par,code,codec_att)
  send_packet(sock,cmd)
  resp=receive_response(sock,set_sbc_resp)
  if resp.header.message_type!=MESSAGE_TYPE_ACCEPT:
    raise IOError('Can not set SBC codec parameters')
  if deb: print "Successfully set SBC codec parameters"
  return seid,sbc_codec  
  
def avdtp_set_configuration(sock,lsep,codecs):
  """ select codec from available codecs
      and sets codec configuration
      just SBC codec is implemented 
      return seid, codec
  """
  lsbc=[(resp,seid) for resp,seid in lsep if \
    resp.header.message_type!=MESSAGE_TYPE_REJECT and\
    resp.media_codec_type==SBC_MEDIA_CODEC_TYPE and\
    resp.media_type==AUDIO_MEDIA_TYPE]
  if not lsbc:  raise IOError('ACP site dose not have SBC codec')
  if len(lsbc)>1 and deb: print 'ACP site has more then one SBC codec, take first' # if ever possible 
  resp,seid=lsbc[0]
  if deb: print "seid=",seid
  return set_sbc_configuration(sock,resp,seid,codecs[SBC_MEDIA_CODEC_TYPE])
  
def avdtp_open(dst,sock,seid):
  """open the audio stream"""
  cmd=message_single()
  cmd=init_command_single(cmd)
  cmd.header.signal_id=AVDTP_OPEN
  cmd.acp_seid=seid
  send_packet(sock,cmd)
  resp=receive_response(sock,open_strm_resp)
  if resp.error: raise IOError('Can not open stream')
  if deb: print "opened stream"
  return avdtp_connect(dst,25)

def avdtp_start(sock,seid):
  cmd=message_single()
  cmd=init_command_single(cmd)
  cmd.header.signal_id=AVDTP_START
  cmd.acp_seid=seid
  send_packet(sock,cmd)
  resp=receive_response(sock,start_strm_resp)
  if resp.error: raise IOError('Can not start stream')
  if deb: print "started stream"

def avdtp_suspend(sock,seid):
  cmd=message_single()
  cmd=init_command_single(cmd)
  cmd.header.signal_id=AVDTP_SUSPEND
  cmd.acp_seid=seid
  send_packet(sock,cmd)
  resp=receive_response(sock,start_strm_resp)
  if resp.error: raise IOError('Can not stop stream')
  if deb: print "suspended stream"

def avdtp_close(sock,seid):
  cmd=message_single()
  cmd=init_command_single(cmd)
  cmd.header.signal_id=AVDTP_CLOSE
  cmd.acp_seid=seid
  send_packet(sock,cmd)
  resp=receive_response(sock,open_strm_resp)
  if resp.error: raise IOError('Can not close stream')
  if deb: print "closed steam"
  

    
class media_packet_header(Structure):
    _pack_=1
    _fields_=[("cc",c_uint8,4),("x",c_uint8,1),("p",c_uint8,1),("v",c_uint8,2)\
      ,("pt",c_uint8,7),("m",c_uint8,1)\
      ,("sequence_number",c_uint16),("time_stamp",c_uint32),("ssrc",c_uint32)]
class media_payload_header(Structure):
    _pack_=1
    _fields_=[("frame_count",c_uint8,4),("rfa01",c_uint8,1),("is_last_fragment",c_uint8,1)\
    ,("is_first_fragment",c_uint8,1),("is_fragmented",c_uint8,1)]

def media_packet(data,timestamp,frame_count,seq_number):
  mtu=672
  if len(data)+ctypes.sizeof(media_payload_header)+ctypes.sizeof(media_packet_header)>mtu:
    raise ValueError('Media packet size >mtu')
  class _media_packet(Structure):
    _pack_=1
    _fields_=[("media_packet_header",media_packet_header)\
      ,("media_payload_header",media_payload_header)\
      ,("data",c_uint8*ctypes.sizeof(data))]
  packet=_media_packet()
  packet.media_packet_header.v=2
  packet.media_packet_header.pt=1
  packet.media_packet_header.sequence_number=seq_number
  packet.media_packet_header.time_stamp=timestamp
  packet.media_packet_header.ssrc=1
  packet.media_payload_header.frame_count=frame_count
  packet.media_payload_header.is_fragmented=0
  packet.media_payload_header.rfa=0
  packet.data=data
  return packet

##### AVCTP & AVRCP ##################################################################################

# Message types
AVCTP_COMMAND_FRAME=0
AVCTP_RESPONSE_FRAME=1

CMD_PASSTHROUGH=0
CMD_ACCEPTED=9

PLAY_OP=68  #0x44
STOP_OP=69  #0x45
PAUSE_OP=70 #0x46
NEXT_OP=75  #0x4b
PREV_OP=76  #0x4c

class avctp_header(Structure):
  _pack_=1
  _fields_=[("ipid",c_uint8,1),("cr",c_uint8,1),("packet_type",c_uint8,2),\
    ("transaction_label",c_uint8,4),("pid",c_uint16)]
class avctp_frame(Structure):
  _pack_=1
  _fields_=[("header",avctp_header),("ctype",c_uint8,4),("zeros",c_uint8,4),\
    ("subunit_id",c_uint8,3),("subunit_type",c_uint8,5),("opcode",c_uint8,8),\
    ("operand0",c_uint8,8),("operand1",c_uint8,8)]

def avrcp_accept_connection():
  sock=bluetooth.BluetoothSocket( bluetooth.L2CAP )
  port=23
  sock.bind(("",port))
  sock.listen(1)
  client_sock,address = sock.accept()
  print "Accepted connection from ",address
  return client_sock

def avrcp_receive_commands(sock,callback):
  while True:
    data=sock.recv(1024)
    if len(data)==0:break
    cmd=ctypes.cast(data,ctypes.POINTER(avctp_frame))
    cmd=cmd.contents
    if cmd.header.packet_type!=PACKET_TYPE_SINGLE: raise ValueError('packet type != PACKET_TYPE_SINGLE')
    if cmd.ctype==CMD_PASSTHROUGH: callback(cmd.operand0)
    cmd.header.ipid=0 # use the same packet for responce
    cmd.header.cr=AVCTP_RESPONSE_FRAME
    cmd.header.packet_type=PACKET_TYPE_SINGLE
    cmd.ctype=CMD_ACCEPTED
    send_packet(sock,cmd)
  sock.close()  
  
#####SBC codec, libscb #################################################################################

class sbc_struct(Structure):
  _fields_=[("flags",c_ulong),("frequency",c_uint32),("channel_mode",c_uint32),("joint",c_uint32)
    ,('block_length',c_uint32),('subbands',c_uint32),('bitpool',c_uint32)\
    ,('data',c_void_p),('size',c_uint32),('len',c_uint32)\
    ,('duration',c_ulong),    ('priv',c_void_p)]

class sbc:
  def __init__(self,*arg,**kwd):
    self.par=sbc_struct()
    self.libsbc=ctypes.CDLL('libsbc.so')
    err=self.libsbc.sbc_init(ctypes.byref(self.par),c_ulong(1))
    if err:   print 'error initializing sbc coder',err
    self.configure(*arg,**kwd)
  def configure(self,frequency=44100,channels=2):
    self.par.subbands=8
    self.par.block_length=16
    self.par.bitpool=32
    self.par.frequency=frequency
    self.par.channel_mode=channels
    self.conf_dict={}
    self.conf_dict['frequency']={48000:1,44100:2,32000:4,16000:8}
    self.conf_dict['subbands']={8:1,4:2}
    self.conf_dict['block_length']={16:1,12:2,8:4,4:8}
    self.conf_dict['channel_mode']={2:2,1:1}
  def encode(self,data):
    l=self.libsbc.sbc_encode(ctypes.byref(self.par),data,len(data))
    return l,self.par.data,self.par.len,self.par.duration
  def fin(self):
    self.libsbc.sbc_finish(ctypes.byref(self.par))

##### useful functions ################################################################################
class timer:
  def __init__(self):
    self.time=time.time()
  def dt_has_elapsed(self,dt):
    return (time.time()-self.time)*1000000>dt-5000  
  def dt(self):
    return (time.time()-self.time)*1000000
  def start(self):
    self.time=time.time()  

def stream_pcm_pipe(f,lacp,commands,extimer=None):
  """ streaming audio by reading pcm from a pipe or file.
  if extimer==None relays on pipe's timer, all packets are
  send as soon as read from the pipe.
  if extimer!=None the given timer is used to send packets.
  """
  packet_header_size=13
  min_encoding_size=512
  mtu=672
  lpackets=[]
  seq_number=0
  frame_count=0
  timestamp=0
  elapsedtime=0 
  buf=(c_uint8*mtu)()
  lenbuf=0
  data=""
  if extimer!=None:timer0=extimer()
  if deb: timer1=timer()
  timer2=timer()
  while True:
    time.sleep(0.00001) # some sleep
    rdata=f.read(1000) # read
    if 'quit' in commands: break
    if len(lacp)==0 or 'pause' in commands:
      if extimer!=None:timer0.start()
      if deb: timer1.start()
      timestamp=0
      frame_count=0
      lpackets=[]
      continue # no streams: just read data from pipe
    if len(rdata)>0:#change endiannes
      adata=array.array('H')
      adata.fromstring(rdata)
      adata.byteswap()
      rdata=adata.tostring()
    data+=rdata
    while len(data)>min_encoding_size: #encode
      l,pendata,lendata,duration=lacp[0].codec.encode(data)
      data=data[l:]
      if lenbuf+lendata+packet_header_size>mtu: #enough for packet
        packetdata=(c_uint8*lenbuf)()
        ctypes.memmove(packetdata,buf,lenbuf)
        lpackets.append(media_packet(packetdata,timestamp,frame_count,seq_number))
        timestamp=elapsedtime # for following packet
        frame_count=0
        seq_number+=1
        if deb and seq_number%1000==0:
          print "sent 1000 packets, elapsed time is %g ms" %(timer1.dt())
          timer1.start()
        buf=(c_uint8*mtu)()
        lenbuf=0
      ctypes.memmove(ctypes.addressof(buf)+lenbuf,pendata,lendata)
      lenbuf+=lendata
      frame_count+=1
      elapsedtime+=duration
    while lpackets: #send packets while there are any
      packet=lpackets[0]
      if extimer==None or timer0.dt_has_elapsed(packet.timestamp):        
        for acp in lacp:
          try:send_packet(acp.stream,packet)
          except bluetooth.BluetoothError: # close and remove dead ACP
            if deb: print "stream error ",acp.addr
            acp.stream.close()
            acp.sock.close()
            if deb: print "close stream ",acp.addr
            lacp.remove(acp)
            if deb:
              print "remove stream, number of streams left",len(lacp)
        del lpackets[0]
         
  
class acp: # container class to keep information about ACP
  def __init__(self,addr):
    self.addr=addr
    self.stream,self.sock,self.seid,self.codec=connect(addr)  

def connect(addr,psm=25):
  """connects to a2dp sink on address addr """
  sbc_codec=sbc(44100,2) # initialize sbc codec
  codecs={SBC_MEDIA_CODEC_TYPE:sbc_codec} # list the available codecs
  sock=avdtp_connect(addr,psm) # connect to the ACP side
  lsep=avdtp_discover(sock) # discover set of codec on ACP side
  seid,codec=avdtp_set_configuration(sock,lsep,codecs) # select and set codec parameters
  stream=avdtp_open(addr,sock,seid) # open audio stream
  avdtp_start(sock,seid) #start audio stream
  return stream,sock,seid,codec

def avdtp_discover_abort(sock):
  cmd=receive_response(sock,message_single)
  cmd.header.message_type=MESSAGE_TYPE_COMMAND
  cmd.header.signal_id=AVDTP_ABORT
  send_packet(sock,cmd)

def advertise_a2dp():
  """advertise a2dp source"""
  server_sock=bluetooth.BluetoothSocket( bluetooth.L2CAP )
  port=25
  server_sock.bind(("",port))
  server_sock.listen(1)
  print "listening on port %d" % port
  uuid = "110a"
  profile=[bluetooth.ADVANCED_AUDIO_PROFILE]
  classes=[bluetooth.AUDIO_SOURCE_CLASS,]
  bluetooth.advertise_service( server_sock, "Audio Source", service_id = "", service_classes = [], \
        profiles = [], provider = "", description = "")
  client_sock,(address,port) = server_sock.accept()
  print "Accepted connection from ",address
  return client_sock,address,port


##### simple multiple client A2DP & AVRCP streaming server  ##########################################

class a2dp_streamer ( threading.Thread ):
  def __init__ ( self, pipename, lacp,commands,timer=None):
    self.pipename=pipename 
    self.lacp=lacp # list of ACP
    self.timer=timer
    self.commands=commands
    threading.Thread.__init__ ( self )

  def run (self):
    stream_pcm_pipe(self.pipename,self.lacp,self.commands,self.timer)
 
def callback_xmms(com):
  if deb: print 'received command code',com
  if   com==PLAY_OP: os.popen('xmms --play')
  elif com==STOP_OP: os.popen('xmms --stop')
  elif com==PAUSE_OP:os.popen('xmms --pause')
  elif com==NEXT_OP: os.popen('xmms --fwd')
  elif com==PREV_OP: os.popen('xmms --rew')
  else: 
    if deb: print "unknown command code",com  
  return 1

class avrcp_server ( threading.Thread ):
  def __init__ ( self):
    threading.Thread.__init__ ( self )
  def run ( self ):
    while True:
      sock=avrcp_accept_connection()
      avrcp_receive_commands(sock,callback_xmms)

if __name__=="__main__":
  """instructions are in the beginning of the file"""
  deb=1
  control=avrcp_server()   # start avrcp
  control.start()          #
  lacp=[]
#  addr="00:0D:44:2A:A1:4C" # can start with online acp
#  lacp.append(acp(addr))   #
#  addr="00:07:A4:00:17:FD" # works with many acp simultaneously
#  lacp.append(acp(addr))   # but only if they are discovered at the beginning
  commands=[]
  f=open('/tmp/a2dpipe','rb',0)
  while True: 
#  dynamically manages new ACP
#  to initiate connection press PLAY button on headphones
#  works only with single ACP
#  discovery of second ACP destroys sound completely.
#  maybe bluetooth is not thread safe?
    streamer=a2dp_streamer(f,lacp,commands)
    streamer.start()
    try:
      sock2,addr,port=advertise_a2dp()
      commands.append('quit') #stop streamer
      streamer.join()
      avdtp_discover_abort(sock2)  
      sock2.close()
      lacp.append(acp(addr))
    except bluetooth.BluetoothError,what: print 'BluetoothError: ', what  
    commands.remove('quit')
    print 'number of ACP', len(lacp)
    
    
  

[-- Attachment #3: Type: text/plain, Size: 373 bytes --]

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Re: [Bluez-devel] python a2dp

[Frédéric DALLEAU]

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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er
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21642
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Re: [Bluez-devel] python a2dp

[Sergey Krivov]

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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http://new.mail.yahoo.com

-------------------------------------------------------------------------
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
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21642
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Re: [Bluez-devel] python a2dp

[Frédéric DALLEAU]

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
>
> -------------------------------------------------------------------------
> 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 ea=
sier
> 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=
=3D121642
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>   =



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Re: [Bluez-devel] python a2dp

[Sergey Krivov]

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

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

--- Fr=E9d=E9ric DALLEAU <frederic.dalleau@palmsource.com>
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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Re: [Bluez-devel] Quality of a2dp sound

[Brad Midgley]

Reiner

> What I did notice is that the volume could be higher and there is the
> occasional faint clicking which might be due to clipping.

I did try to hunt these down for a good while but didn't have a lot of 
luck. It came down to a balance of one problem or the other. :(

I was thinking recently both these could be solved by doing dynamic 
compression before encoding the audio. It would reduce the dynamic range 
however.

Brad

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Re: [Bluez-devel] Quality of a2dp sound

[Marcel Hilzinger]

Am Donnerstag, 9. November 2006 11:42 schrieb Adrian Glaubitz:
> Hi Marcel !
>
> Marcel Hilzinger schrieb:
> > Hi,
> >
> > I made some tests with bluetooth stereo headsets and a2dpd.
> > I must confess, I'm impressed by the easy use of a2dpd! Thanks, it's ju=
st
> > great.
>
> Yes, the usage is very simple, indeed. Once I figured out how to use
> passkey-agent, the connection worked immediately ;).
>
> > But I'm not impressed by the audio quality. Its quite noisy and far away
> > from the quality of normal wireless headphones. Headset was a Jabra
> > BT620s. I tried with different dongles, but the dongle seems to make no
> > difference.
>
> My problem with the audio quality and a2dpd is, that the quality is set
> to telephone quality only (8kHz, Mono) though my headset can do up to
> 44,1kHz Stereo (SONY VGP-BRM1D) and a2dpd even displays 44,1kHz. When
> using a2play I can listen in 44,1kHz quality, so this is an issue with
> a2dpd for me (but a2play plays the MP3s with higher speed, so they sound
> high-pitched). Also the sound is chopped very often with a2dpd, so this is
> no use for me at the moment :(.
>
> > Questions:
> > is this a problem of the technology?
>
> I don't think so, this is rather due to the fact that btsco is still in
> Alpha status of development.
>
> > is it a problem of bluez?
>
> No, I'd rather blame btsco. (I tried different kernel versions, 2.6.17.9
> and 2.6.19-rc5 and the most recent bluez-utils version).
>
> > did I something wrong?
>
> Have you tried a2play instead ? Do this:
>
> - hcitool scan
> - passkey-agent <code> <address>
> - btsco -r -v <address>
> - mpg123 --au - file.mp3 | a2play <address>

Hey, thanks! I tried this once before, but it didn't work. So I gave up. Bu=
t =

now it works like a charm and yes, sound quality is better.

However, with this solution I can only play MP3 files. But most of my =

collection is in OGG-Vorbis. And how to skip to next/previous track?


> > did anybody compare the quality on Windows? I tried to compare with Mac.
> > But as Mac OS X cannot do a2dpd, it's even worse on Mac.
>
> I was not able to use my headset in Windows, Windows doesn't give me any
> options for choosing the headset as an audio output-device, though I can
> to the headset successfully. On 2 Macintosh Mini (Intel and PPC) with OS
> 10.4 I was able to connect to the headset without any problems, and I cou=
ld
> choose my headset for all the sound-output so I was able to listen to
> iTunes via the headset. The only drawback on the Mac is, that the
> quality is limited to 8000Hz, 16 Bit mono (and the Audio Utility won't
> let me choose any better quality, though the headset supports this).
Mac does not support a2dp, that's why the quality is bad.


-- =

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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Re: [Bluez-devel] Quality of a2dp sound

[Thomas Kear]

You should be able to use the command line encoding tools in their
decode modes to play most formats.  For example:

flac -c -d [file] | aplay
lame --decode [file] - | aplay
oggdec -c [file] | aplay  (not so sure about this one, some command
switches are like flac, some aren't)

Should stretch to some other formats too, wavpack springs to mind
(although i can't remember its command line syntax).


On 10/11/06, Marcel Hilzinger <mhilzinger@linuxnewmedia.de> wrote:
> Am Donnerstag, 9. November 2006 11:42 schrieb Adrian Glaubitz:
> > Hi Marcel !
> >
> > Marcel Hilzinger schrieb:
> > > Hi,
> > >
> > > I made some tests with bluetooth stereo headsets and a2dpd.
> > > I must confess, I'm impressed by the easy use of a2dpd! Thanks, it's =
just
> > > great.
> >
> > Yes, the usage is very simple, indeed. Once I figured out how to use
> > passkey-agent, the connection worked immediately ;).
> >
> > > But I'm not impressed by the audio quality. Its quite noisy and far a=
way
> > > from the quality of normal wireless headphones. Headset was a Jabra
> > > BT620s. I tried with different dongles, but the dongle seems to make =
no
> > > difference.
> >
> > My problem with the audio quality and a2dpd is, that the quality is set
> > to telephone quality only (8kHz, Mono) though my headset can do up to
> > 44,1kHz Stereo (SONY VGP-BRM1D) and a2dpd even displays 44,1kHz. When
> > using a2play I can listen in 44,1kHz quality, so this is an issue with
> > a2dpd for me (but a2play plays the MP3s with higher speed, so they sound
> > high-pitched). Also the sound is chopped very often with a2dpd, so this=
 is
> > no use for me at the moment :(.
> >
> > > Questions:
> > > is this a problem of the technology?
> >
> > I don't think so, this is rather due to the fact that btsco is still in
> > Alpha status of development.
> >
> > > is it a problem of bluez?
> >
> > No, I'd rather blame btsco. (I tried different kernel versions, 2.6.17.9
> > and 2.6.19-rc5 and the most recent bluez-utils version).
> >
> > > did I something wrong?
> >
> > Have you tried a2play instead ? Do this:
> >
> > - hcitool scan
> > - passkey-agent <code> <address>
> > - btsco -r -v <address>
> > - mpg123 --au - file.mp3 | a2play <address>
>
> Hey, thanks! I tried this once before, but it didn't work. So I gave up. =
But
> now it works like a charm and yes, sound quality is better.
>
> However, with this solution I can only play MP3 files. But most of my
> collection is in OGG-Vorbis. And how to skip to next/previous track?
>
>
> > > did anybody compare the quality on Windows? I tried to compare with M=
ac.
> > > But as Mac OS X cannot do a2dpd, it's even worse on Mac.
> >
> > I was not able to use my headset in Windows, Windows doesn't give me any
> > options for choosing the headset as an audio output-device, though I can
> > to the headset successfully. On 2 Macintosh Mini (Intel and PPC) with OS
> > 10.4 I was able to connect to the headset without any problems, and I c=
ould
> > choose my headset for all the sound-output so I was able to listen to
> > iTunes via the headset. The only drawback on the Mac is, that the
> > quality is limited to 8000Hz, 16 Bit mono (and the Audio Utility won't
> > let me choose any better quality, though the headset supports this).
> Mac does not support a2dp, that's why the quality is bad.
>
>
> --
> 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 ea=
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=3D121642
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>


-- =

Thomas Kear
thomas.kear@gmail.com
+6421996486

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[Bluez-devel] RE : Quality of a2dp sound

[Frederic Dalleau]

[-- Attachment #1: Type: text/plain, Size: 871 bytes --]

Hi Adrian,

I've been using a2dpd for days with xmms.
I've pretty good quality and the latest patch make it possible to select encoding parameter so sound is better.
There is still some gain loss but it is enough to make you deaf.

> the quality is set to telephone quality only (8kHz, Mono) though my headset can do up to
> 44,1kHz Stereo (SONY VGP-BRM1D) and a2dpd even displays 44,1kHz. 
8khz is when you use heasetd and sco, isn't it?
a2dpd will be 44,1 khz but you may have choppy sound.

> Also the sound is chopped very often with a2dpd, so this is no use for me
at the moment :(.
Which player are you using? I have to agree that some player are giving us trouble, but I had success with xmms,vlc and mpg321.

> > did anybody compare the quality on Windows?
There is a product called BlueSoleil that you might want to try.


Regards,
Frederic

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[-- Type: application/ms-tnef, Size: 3109 bytes --]

[-- Attachment #3: Type: text/plain, Size: 373 bytes --]

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

[Adrian Glaubitz]

Hello Frederic,

> I've been using a2dpd for days with xmms.
> I've pretty good quality and the latest patch make it possible to select encoding parameter so sound is better.
> There is still some gain loss but it is enough to make you deaf.

Maybe I should go for the latest patches then, too. Though I think my
version (30 Oct) is quite recent.

> 
> > the quality is set to telephone quality only (8kHz, Mono) though my headset can do up to
> > 44,1kHz Stereo (SONY VGP-BRM1D) and a2dpd even displays 44,1kHz. 
> 8khz is when you use heasetd and sco, isn't it?
> a2dpd will be 44,1 khz but you may have choppy sound.

I have 8kHz and choppy sound :(. But as I said before, sound is almost
perfect with "a2play" except for some noise and the speed-problems.

> 
> > Also the sound is chopped very often with a2dpd, so this is no use for me
> at the moment :(.
> Which player are you using? I have to agree that some player are giving us trouble, but I had success with xmms,vlc and mpg321.

I tried "xmms" (latest Debian ETCH) for a2dpd and mpg123 for a2play.

Greetings,

Adrian

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