Some questions about audio on embedded systems

Bluez-devel deker 2 participants 4 messages Oct 15, 2008 – Oct 16, 2008 Bluetooth drivers

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deker

author

2008-10-15 19:03 UTC #0 lore raw

Hi,

I'm doing some research for an upcoming project where I'll need to use
a bluetooth headset for audio (send & recv) with a gumstix. I found the following two pages:

http://bluetooth-alsa.sourceforge.net/embed.html
http://bluetooth-alsa.sourceforge.net/embedv1.html

which have great information, but I'm curious as to which is the most current/correct. Specifically, I'm wondering what the current status of SCO audio with the gumstix (and just on regular PCs frankly) is. I understand that the blues-alsa project is moving away from btsco toward plugz, but didn't know how this would affect me on a gumstix.

Any info would be greatly appreciated.

Thanks,

-d

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Brad Midgley

2008-10-16 00:13 UTC #1 lore raw

Deker

The best option is to use the most recent bluez version you can and use the built-in audio service it provides. btsco and plugz are both dead ends. There is a little bit of hackery you'll have to do with eg hciattach which has patches that can't go upstream. See the gumstix openembedded package for details. Make sure you ask the gumstix folks because I believe they have a newer bluez than the default one you get in their openembedded environment.

As far as hardware, if you're not using a prototype of the next gumstix board then you should add a bluetooth USB adapter that has a CSR chip in it to a verdex board. The integrated bluetooth module has not been used successfully for SCO.

Brad

Quoted 31 lines · deker

Hi,
I'm doing some research for an upcoming project where I'll need to use
a bluetooth headset for audio (send & recv) with a gumstix. I found the following two pages:
http://bluetooth-alsa.sourceforge.net/embed.html
http://bluetooth-alsa.sourceforge.net/embedv1.html
which have great information, but I'm curious as to which is the most current/correct. Specifically, I'm wondering what the current status of SCO audio with the gumstix (and just on regular PCs frankly) is. I understand that the blues-alsa project is moving away from btsco toward plugz, but didn't know how this would affect me on a gumstix.
Any info would be greatly appreciated.
Thanks,
-d
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Signature · 11 lines

Brad Midgley

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[email protected]

author

2008-10-16 02:23 UTC #2 lore raw

Brad,

Thanks for the pointers. I was getting a little confused WRT what was the
current best path. Where can I find info on the hciattach patches, etc? I don't recall seeing anything about that in my searching.

I figured I'd have to use a different BT module, so I'm working with prototyping on a laptop until I get my gumstix gear together. I need to figure out how to use the HFP to get handsfree device events, and I figure that may take a bit of time.

Thanks again,

-d

Quoted 58 lines

Deker
The best option is to use the most recent bluez version you can and use the built-in audio service it provides. btsco and plugz are both dead ends. There is a little bit of hackery you'll have to do with eg hciattach which has patches that can't go upstream. See the gumstix openembedded package for details. Make sure you ask the gumstix folks because I believe they have a newer bluez than the default one you get in their openembedded environment.
As far as hardware, if you're not using a prototype of the next gumstix board then you should add a bluetooth USB adapter that has a CSR chip in it to a verdex board. The integrated bluetooth module has not been used successfully for SCO.
Brad
Quoted 21 lines · deker
Hi,
I'm doing some research for an upcoming project where I'll need to use
a bluetooth headset for audio (send & recv) with a gumstix. I found the following two pages:
http://bluetooth-alsa.sourceforge.net/embed.html
http://bluetooth-alsa.sourceforge.net/embedv1.html
which have great information, but I'm curious as to which is the most current/correct. Specifically, I'm wondering what the current status of SCO audio with the gumstix (and just on regular PCs frankly) is. I understand that the blues-alsa project is moving away from btsco toward plugz, but didn't know how this would affect me on a gumstix.
Any info would be greatly appreciated.
Thanks,
-d
Quoted 13 lines
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Brad Midgley

Quoted 13 lines

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Brad Midgley

2008-10-16 02:52 UTC #3 lore raw

Deker

The hciattach etc patches for gumstix are buried in their openembedded package, but come to think of it that was special case stuff for the internal adapter. You'll use an external so you should be able to use the latest and greatest packaging of bluez. That might mean replacing the gumstix packge with something direct from the OE guys. You might need to learn more about how OE packages and distros work.

To test things on your laptop, use the docs at wiki.bluez.org to set up audio. You might be able to use d-bus calls to get the HFP negotiation you need. It's easiest to prototype that stuff in python using the examples in the wiki.

Brad

Quoted 98 lines · On Wed, Oct 15, 2008 at 8:23 PM, <[email protected]> wrote:

Brad,
Thanks for the pointers. I was getting a little confused WRT what was the
current best path. Where can I find info on the hciattach patches, etc? I don't recall seeing anything about that in my searching.
I figured I'd have to use a different BT module, so I'm working with prototyping on a laptop until I get my gumstix gear together. I need to figure out how to use the HFP to get handsfree device events, and I figure that may take a bit of time.
Thanks again,
-d
Quoted 58 lines
Deker
The best option is to use the most recent bluez version you can and use the built-in audio service it provides. btsco and plugz are both dead ends. There is a little bit of hackery you'll have to do with eg hciattach which has patches that can't go upstream. See the gumstix openembedded package for details. Make sure you ask the gumstix folks because I believe they have a newer bluez than the default one you get in their openembedded environment.
As far as hardware, if you're not using a prototype of the next gumstix board then you should add a bluetooth USB adapter that has a CSR chip in it to a verdex board. The integrated bluetooth module has not been used successfully for SCO.
Brad
Quoted 21 lines · deker
Hi,
I'm doing some research for an upcoming project where I'll need to use
a bluetooth headset for audio (send & recv) with a gumstix. I found the following two pages:
http://bluetooth-alsa.sourceforge.net/embed.html
http://bluetooth-alsa.sourceforge.net/embedv1.html
which have great information, but I'm curious as to which is the most current/correct. Specifically, I'm wondering what the current status of SCO audio with the gumstix (and just on regular PCs frankly) is. I understand that the blues-alsa project is moving away from btsco toward plugz, but didn't know how this would affect me on a gumstix.
Any info would be greatly appreciated.
Thanks,
-d
Quoted 13 lines
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--
Brad Midgley
Quoted 13 lines
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Signature · 11 lines

Brad Midgley

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