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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?

AptX codecs on Android 10

Hi.
I've seen barely any mention of this issue.
I've tried several ROMs like Bliss, Havoc and Evolution, all of them Q.
I have an EarStudio E100 DAC which supports AptX and AptX HD, which were working perfectly well on Android 9.
I was able to select the right codec from Developer Options and the sound would be much better and SBC or AAC, but now on Android 10, there is no difference whatsoever. I can select AptX HD it does not stick and reverts back to the lowest quality codec.
Any idea on how to solve this?
EDIT:
On Reddit, from user CoolGeek71, I found out that selecting the capabilities FIRST and only after that selecting AptX HD inside Developer Options, Android will use the requested codec. So, instead of selecting AptX HD only as it was on Pie, I have to select before the "Bluetooth Audio Sample Rate" to 44.1kHz or 48kHz and "Bluetooth Audio Bits per Sample" to 24 bits. Only then, stupid Android 10 will use it.
Once again, Google making simple things harder to use.

I noticed that if I change the developer settings for Bluetooth codec it automatically changes it back to defaults after I close out of the settings.
Sent from my GM1917 using Tapatalk

This stupid problem is also present with LDAC quality settings as well. I use the Fiio BTR5.
Interestingly, Beta 8 fixed this issue. However this bug has reared its ugly head on the newest 1.0.3.1 again.

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...
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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.

Question S980U bluetooth codecs

Any way to enable all of the bt codecs that are supported by the processor but disabled by samsung?

Can only select SBC.

Bt device needs to support the codec.
Some apps use only sbc.
If the app and device use the blanked out codec try clearing system cache, a network reset, turning Developer options off then back on.
Make sure you didn't disable a needed service, turn off global power management.

The problem is Samsung disabled the high res codecs. Even with a supported device, it can not be selected.

LDAC and SCC should be available.
No APTX HD.

I got ldac working. Thanks

当你连接蓝牙设备后，这个会自动切换的
Translated by GT: When you connect a bluetooth device, this will automatically switch

bestbocai said:
当你连接蓝牙设备后，这个会自动切换的
Click to expand...
Click to collapse
"When you connect a bluetooth device, this will automatically switch"
Welcome to XDA
English only please per forum rules.
Best to check it in Developer options when connected and using to verify the codec in use if set to automatic detection.

Samsung also hides a toggle in Settings - Connections - Bluetooth - your Bluetooth device. This is how I got LDAC working on my Soundcore Liberty 3 headphones.

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.