Audio Sink Support

Audio Sink Support

[bluezprofile kernel]

Hi All,
I am trying to connect my A2DP enabled mobile with Bluez host in
Ubuntu 9.10 karmic Koala.
Bluez version : 4.51 (A2DP sink support added in 4.46)
Kernel: 2.6.31
Pulseaudio: 0.9.19 and 0.9.21

I read following link to do
http://jprvita.wordpress.com/2009/07/17/bluez-now-has-a2dp-sink-support/

1) As mentioned in the link, I am able to connect to the audio sink and
see the audio streaming in the hcidump. It disconnects in few seconds.
Is this the current status of Audio sink or any other patches added
2) Is any one played the song in host successfully with any player(There is
no player to decode the stream) using sink support.
Then please give me a hint to proceed.
3) Some times my audio configuration setting is getting crashed once I
play the song from mobile.
Is this know issue?

Do I need to enable any flag on bluez/pulseaudio to succeed this?
or any specific kernel patch do I need to apply?
Please advice.

Thanks,
Nic Shen

Re: Audio Sink Support

[João Paulo Rechi Vita]

On Tue, Dec 15, 2009 at 8:45 AM, bluezprofile kernel
<bluezprofile@gmail.com> wrote:
> Hi All,
> I am trying to connect my A2DP enabled mobile with Bluez host in
> Ubuntu 9.10 karmic Koala.
> Bluez version : 4.51 (A2DP sink support added in 4.46)
> Kernel: 2.6.31
> Pulseaudio: 0.9.19 and 0.9.21
>
> I read following link to do
> http://jprvita.wordpress.com/2009/07/17/bluez-now-has-a2dp-sink-support/
>
> 1) As mentioned in the link, I am able to connect to the audio sink and
> see the audio streaming in the hcidump. It disconnects in few seconds.
> Is this the current status of Audio sink or any other patches added
> 2) Is any one played the song in host successfully with any player(There is
> no player to decode the stream) using sink support.
> Then please give me a hint to proceed.

The recommended is to use pulseaudio to decode the frames and offer a
source abstraction for applications. If you want the audio to be sent
to your speakers, you can use module-loopback (in pulseaudio) for
that.

> 3) Some times my audio configuration setting is getting crashed once I
> play the song from mobile.
> Is this know issue?
>

No clues, you need to elaborate more if you want any help.

> Do I need to enable any flag on bluez/pulseaudio to succeed this?
> or any specific kernel patch do I need to apply?
> Please advice.
>

No kernel nor userspace patches. You just need to enable the
AudioSource interface in bluez and use pulseaudio bluetooth modules to
handle the stream.

This post has a more detailed description on how to do so:
http://jprvita.wordpress.com/2009/12/15/1-2-3-4-a2dp-stream/

-- 
João Paulo Rechi Vita
MSc Computer Science Student
Computer Engineer
IC / Unicamp
http://jprvita.wordpress.com/

Re: Audio Sink Support

[bluezprofile kernel]

2009/12/16 João Paulo Rechi Vita <jprvita@gmail.com>:
> On Tue, Dec 15, 2009 at 8:45 AM, bluezprofile kernel
> <bluezprofile@gmail.com> wrote:
>> Hi All,
>> I am trying to connect my A2DP enabled mobile with Bluez host in
>> Ubuntu 9.10 karmic Koala.
>> Bluez version : 4.51 (A2DP sink support added in 4.46)
>> Kernel: 2.6.31
>> Pulseaudio: 0.9.19 and 0.9.21
>>
>> I read following link to do
>> http://jprvita.wordpress.com/2009/07/17/bluez-now-has-a2dp-sink-support/
>>
>> 1) As mentioned in the link, I am able to connect to the audio sink and
>> see the audio streaming in the hcidump. It disconnects in few seconds.
>> Is this the current status of Audio sink or any other patches added
>> 2) Is any one played the song in host successfully with any player(There is
>> no player to decode the stream) using sink support.
>> Then please give me a hint to proceed.
>
> The recommended is to use pulseaudio to decode the frames and offer a
> source abstraction for applications. If you want the audio to be sent
> to your speakers, you can use module-loopback (in pulseaudio) for
> that.
>
>> 3) Some times my audio configuration setting is getting crashed once I
>> play the song from mobile.
>> Is this know issue?
>>
>
> No clues, you need to elaborate more if you want any help.
>
>> Do I need to enable any flag on bluez/pulseaudio to succeed this?
>> or any specific kernel patch do I need to apply?
>> Please advice.
>>
>
> No kernel nor userspace patches. You just need to enable the
> AudioSource interface in bluez and use pulseaudio bluetooth modules to
> handle the stream.
>
> This post has a more detailed description on how to do so:
> http://jprvita.wordpress.com/2009/12/15/1-2-3-4-a2dp-stream/
>
> --
> João Paulo Rechi Vita
> MSc Computer Science Student
> Computer Engineer
> IC / Unicamp
> http://jprvita.wordpress.com/
>

bluezprofile kernel to João
show details 5:27 PM (0 minutes ago)


2009/12/16 João Paulo Rechi Vita <jprvita@gmail.com>:

- Show quoted text -
> On Tue, Dec 15, 2009 at 8:45 AM, bluezprofile kernel
> <bluezprofile@gmail.com> wrote:
>> Hi All,
>> I am trying to connect my A2DP enabled mobile with Bluez host in
>> Ubuntu 9.10 karmic Koala.
>> Bluez version : 4.51 (A2DP sink support added in 4.46)
>> Kernel: 2.6.31
>> Pulseaudio: 0.9.19 and 0.9.21
>>
>> I read following link to do
>> http://jprvita.wordpress.com/2009/07/17/bluez-now-has-a2dp-sink-support/
>>
>> 1) As mentioned in the link, I am able to connect to the audio sink and
>> see the audio streaming in the hcidump. It disconnects in few seconds.
>> Is this the current status of Audio sink or any other patches added
>> 2) Is any one played the song in host successfully with any player(There is
>> no player to decode the stream) using sink support.
>> Then please give me a hint to proceed.
>
> The recommended is to use pulseaudio to decode the frames and offer a
> source abstraction for applications. If you want the audio to be sent
> to your speakers, you can use module-loopback (in pulseaudio) for
> that.
>
>> 3) Some times my audio configuration setting is getting crashed once I
>> play the song from mobile.
>> Is this know issue?
>>
>
> No clues, you need to elaborate more if you want any help.
>
>> Do I need to enable any flag on bluez/pulseaudio to succeed this?
>> or any specific kernel patch do I need to apply?
>> Please advice.
>>
>
> No kernel nor userspace patches. You just need to enable the
> AudioSource interface in bluez and use pulseaudio bluetooth modules to
> handle the stream.
>
> This post has a more detailed description on how to do so:
> http://jprvita.wordpress.com/2009/12/15/1-2-3-4-a2dp-stream/
>
> --
> João Paulo Rechi Vita
> MSc Computer Science Student
> Computer Engineer
> IC / Unicamp
> http://jprvita.wordpress.com/
>

João,
Thanks for the reply.
I was able to succeed till the step 3 and partial of step 4.
I am able to connect to audio source. Once I start play song from A2DP mobile,
my sound card settings disappears from the panel and pulse audio get
disconnected.
In /var/log/messages I see

pulseaudio[1728]: ratelimit.c: 122 events suppressed
pulseaudio[2190]: pid.c: Stale PID file, overwriting.
pulseaudio[2198]: pid.c: Stale PID file, overwriting.

What kind of debug traces do you need for this debugging? Can I send
bluetoothd debug details. Will that help?

Thanks,
Nic Shen