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Oreo - Developer Bluetooth options discussion

Hi all!
I wanted to open up a discussion about the new Oreo features for Bluetooth codecs in the developer section. I haven't been able to find a comprehensive guide or info anywhere that covers how it actually should work, and I don't believe it's working correctly - I would like to explore more with you.
I'm on a Google (carrier free) Pixel, using a fresh install of OPR6.170623.012 - which is working brilliantly by the way.
It seems to me that I can't make the settings stick, if I for example change the Bluetooth Audio Codec to aptX, or modify any of the other settings when I go back in it always reverts to the 'Use System Selection (Default)' option. I'm typically trying this with Bluetooth off, changing the setting and turning Bluetooth on. I've also tried rebooting in-between, as well as different variations. The developer toggle is set to on of course.
It may be my misunderstanding of how this works, but it even if I stay on the developers screen and change the codec, if I turn Bluetooth on and it connects to a device, for instance my in-car Bluetooth audio, which I believe supports aptX, it doesn't care what the codec setting is and displays 'Streaming: SBC', which is of course what I'd expect would be overridden.
The only thing that seems to stick is the AVRCP version. I'm wondering if the Bluetooth HCI snoop log will provide any information?
Have any of you had any experience with this, or have anything to add to the conversation?
Many thanks in advance,

OK so it seems this codec list doesn't allow you to set a 'default', it just allows for modifying the codec during playback?
What I've experienced so far is that it does work with 'Use System Selection' to use the best codec available on the device you are connected to. It also allows you to change the codec to another while streaming/playing. The sub-text under Bluetooth Audio Codec does dynamically change from SBC to AAC.
Example: My headphones support SBC and AAC, the Pixel defaults to AAC on establishing a Bluetooth connection but does allow downgrading to SBC by picking from the list (as a test).
It however doesn't retain whatever you pick in the list if bluetooth is turned off then back on, it basically always defaults to system selection, then auto-picks on every connection. Perhaps this is by design, it is developer tools after all.
I haven't been able to get this to work with aptX in my car yet with my Pixel, even though it is apparently supported?
Also of note: To achieve AAC on my Bluetooth headphones I had to put them into a 'Priority on sound quality' mode and also turn off the Bluetooth phone (i.e. call connectivity, music ONLY) on the Pixel connection to achieve AAC.

are you sure that your car supports aptx? before this developer option it was very hard to actually see the codec being used.

I believe so, the Bluetooth product states that it supports EDR and aptX, but yes, I cannot be 100% certain.
Are you suggesting it should be possible with Pixel and the Oreo build as-is?

Developer options Bluetooth settings don't stick

I've been experimenting with the Bluetooth options in developer options, but every time I change them, they change back to the default settings.
Has anyone any help on how to make them stick?
Sent from my [device_name] using XDA-Developers Legacy app

I've experienced this as well. I believe by design, you must first have an audio device paired and connected before changing these settings, and even then, when doing so, the BT device must be capable of such settings. As an example, when my BT headphones are connected, I can set the DEV option to a lower than 24 bits "per sample" but not higher. All the settings here depend on the hardware in use and whether it is capable of the setting. ->Then when disconnected, the dev options return to their default settings. -But they should return when re-connected.
-hope this helps to at least get the discussion ball rolling.

oryanh said:
I've experienced this as well. I believe by design, you must first have an audio device paired and connected before changing these settings, and even then, when doing so, the BT device must be capable of such settings. As an example, when my BT headphones are connected, I can set the DEV option to a lower than 24 bits "per sample" but not higher. All the settings here depend on the hardware in use and whether it is capable of the setting. ->Then when disconnected, the dev options return to their default settings. -But they should return when re-connected.
-hope this helps to at least get the discussion ball rolling.
Click to expand...
Click to collapse
^ The above is definitely not true. At least not for everyone. I have a galaxy note 9 and I've tried connecting headphones as well as a pair of edifier speakers. Nothing except AVRCP version sticks, and that sticks whether I have a bluetooth device connected or not. Everything else does not stick, even though both devices are of course capable of aptX and 48khz and 24b/s. In fact the speakers are intended for 48khz 24b/s, it causes audio stuttering if I have anything else. No matter what I do, everything just defaults to SBC, 44.1khz, 16b/s. It's clearly broken and has been for like 3 versions of android OS lol. Every android phone I've ever had has had this problem too. So clearly it has nothing to do with the hardware you're connected to, since all the devices I've connected are intended for aptX, 48khz, 24b/s. And I don't think it has anything to do with the phone's hardware either, since I used to use an essential phone which is advertised as being intended for aptX HD use with the "TIDAL" app. They gave me a 3 month free trial to this service and said it output high fidelity audio via aptX HD. But no, the essential phone's bluetooth developer options behaved in exactly the same way. I've tried a lot of other things as well, so I'm pretty sure this UI element is either just fundamentally broken, or is intentionally locked from the user, presumably for some patronizing reason

Poco X3 - Galaxy buds connected but audio not coming through

Hi Guys, Any solution to enable the audio for galaxy buds?
i tried developer options like disable miui optimisation but it does not work.

Try doing a network reset.
Clear system cache.

I fixed it. It chose the SBC codec by default.. you have to turn on the bluetooth AAC in the bluetooth setting for the pairing

Zessak said:
I fixed it. It chose the SBC codec by default.. you have to turn on the bluetooth AAC in the bluetooth setting for the pairing
Click to expand...
Click to collapse
They should work with the SBC codec. Depending what the source is on my 10+ it will either use the SBC or SSC codec when set to default.
So there's still an issue... that's strange.
If you had a Samsung device you could use their SSC codec which has superior resolution.

Bluetooth audio options greyed out

Hi. I have had a 8t 5g for about a month now. Just got a pair of bluetooth headphones (Sennheiser 4.50btnc) and when i go to pair them they dont show up. I have paired them w my PC and they work. When Im in my bluetooth audio codec settings I can see the aptX options and a few others listed but they are all greyed. Am i missing something?

Try clearing the system cache and a network reset.
Androids are notorious for hidden, I mean, advanced settings. Double check to make sure they are correct.
Try enabling Developer options as well for more settings.

I have dev settings on, that's how i was able to see all the codecs and settings I think. Clearing the "system cache"?

bbiigg said:
I have dev settings on, that's how i was able to see all the codecs and settings I think. Clearing the "system cache"?
Click to expand...
Click to collapse
Google it for that device. It's either on the boot menu or in advanced settings.
Good to do if having issues or after installing or uninstalling apps, updates.

blackhawk said:
Google it for that device. It's either on the boot menu or in advanced settings.
Good to do if having issues or after installing or uninstalling apps, updates.
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Click to collapse
done. Cache wiped. Network reset. all options for codec still greyed out. I noticed also that the button for HD audio is turned off and greyed out as well.

bbiigg said:
done. Cache wiped. Network reset. all options for codec still greyed out. I noticed also that the button for HD audio is turned off and greyed out as well.
Click to expand...
Click to collapse
Try SBC first, that should work with all bt audio devices. Try toggling the earbuds off/on.
Does the phone "see" them?
Will it work on calls?
Is there an app that comes with that bt device or one on that phone?

blackhawk said:
Try SBC first, that should work with all bt audio devices. Try toggling the earbuds off/on.
Does the phone "see" them?
Will it work on calls?
Is there an app that comes with that bt device or one on that phone?
Click to expand...
Click to collapse
All codecs including SBC are greyed out, SBC, AAC, Qualcomm aptX +hd audio, adaptive X, aptX tws. "Use system selection" is on by default. Ive turned off the haedphones and back on several times. they show up immediatley on my PC's bluetooth, and work just fine just not on the 8t. frustrating.

so my phone works on the bluetooth in my car using SBC driver. The phone itself displays plenty of driver codecs in the bluetooth settings. The headphones in question (Sennheiser 4.50btnc) only work on my PC and not my phone but 2 other bluetooth earbud devices worked fine on my phone other than the crappy blutooth lag which is why I looked for headphones w aptX. Im inclined to think that because these headphones are "refubished" that this pair is just Janky. Need to return them.

bbiigg said:
so my phone works on the bluetooth in my car using SBC driver. The phone itself displays plenty of driver codecs in the bluetooth settings. The headphones in question (Sennheiser 4.50btnc) only work on my PC and not my phone but 2 other bluetooth earbud devices worked fine on my phone other than the crappy blutooth lag which is why I looked for headphones w aptX. Im inclined to think that because these headphones are "refubished" that this pair is just Janky. Need to return them.
Click to expand...
Click to collapse
Update their firmware... if possible.
Or return them if easier.

it's normal for these options to be greyed out. the system will always choose the best codec for you.

WaxysDargle said:
it's normal for these options to be greyed out. the system will always choose the best codec for you.
Click to expand...
Click to collapse
It means that for whatever reason(s) they not available. Could be a settings, software, firmware or a hardware issue or it's not designed to support the device.

blackhawk said:
It means that for whatever reason(s) they not available. Could be a settings, software, firmware or a hardware issue or it's not designed to support the device.
Click to expand...
Click to collapse
You should verify with a different app that they're not being used. Even when they're not grayed out you still can't change them

Question Ldac codec

Hi, Can i use LDAC codec with s22 ultra and Sony WF-1000XM4 ? In the developer options i can't, even if I select LDAC, it remains on AAC ? Any ideeas please ? Thanks a lot

You don't need to go to developer options. Open Bluetooth settings, find the XM4, tap the settings wheel and select LDAC codec (you need to have the headphones connected to activate this option)

That stumped me as well when I first tried activating LDAC as well on my Soundcore Liberty 3 earbuds. xsam123 is correct

Perfect, it works ! Thanks !

Hi!
If you have any other problems with LDAC, even with using developper option, don't waste you time any further.
(I've spent so much time to correct the issue in this way)
Developer solution's won't work.
And you'll not have the choice to enable LDAC in Bluetooth normal user setting
Reboot your Xiaomi with hard reset.
Everything will become clear and operational.
LDAC Choice will appear correctly again.
Best regards

Be sure HD audio is enabled as LDAC codec in the bluetooth device info, in the bluetooth connection app.