[Android Software/Hacking General [Developers Only]] CZ Eddie:
EDIT: 3/21/17

aptX and aptX (and possibly other flavors) are all supported "right out of the box" in Android "O".

https://xdaforums.com/showpost.php?p=71533614&postcount=286

I revoke my personal bounty as it's now just a matter of time before AOSP ROM's show up for my device at least, which work with aptX.

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EDIT: 2/18/17

It seems that most or all Lineage OS (LOS) 14.X based ROM's are working with aptX. Multiple people with various different Qualcomm cellphones are reporting aptX working after installing the .so files.

Is there any device out there it's NOT working for?

Bounty still available if you can figure out how to make it work in AOSP ROM's.

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EDIT: 1/15/17

@dh.harold has aptX working on a few LineageOS 14.1 devices running Qualcomm Bluetooth stacks.

Please go to his thread and give him some thanks and to read about how to install the mod.

https://xdaforums.com/oneplus-3/themes/mod-aptx-codec-t3521228

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EDIT: 8/17/15 This thread is going nowhere fast. As of todays date there are no perfect working hacks to get APT-X working in AOSP ROM's.

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EDIT: AFTER MORE TESTING, THE RESULTS SEEM TO BE FLAKEY.

DO NOT FLASH JUST YET (UNLESS YOU REALLY WANT TO). IT MAY REQUIRE RE-FLASHING YOUR ROM IF IT DOESN'T WORK.

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Thanks to some helpful folks such as SPLESH & werty100 & glycolysis & others, we now have APT-X working in 4.4 AOSP ROM's for phones that originally shipped with the APT-X codec.

You'll find a list of those phones in the list further below.

To download a flashable zip that makes your phone use the APT-X high-def Bluetooth codec, then skip to post # 33below.

http://xdaforums.com/showpost.php?p=48188145&postcount=33

Thanks to:

MORAL SUPPORT:

th4r

fedevd

Topfar

withmenilu

cx5

Oli28

mojonba

stephendt0

DeKey0

wooki

CONTRIBUTORS:

farfrommovin

emprize

BenG7

CZ Eddie

DEVELOPMENTAL ADVICE:

WERTY100

glycolysis

dh.harald

DEVELOPMENTAL BREAKTHROUGH:

SPLESH

PREVIOUS/OLD THREAD DETAILS:

=============================================

What is APT-X?

It's Bluetooth for "Audiophiles".

Basically, it's the next step beyond A2DP and it delivers a "high definition", "CD" type sound. It's Bluetooth without all the compression that A2DP suffers from.

APT-X Lossless supports high-definition audio up to 96 kHz sampling rates and sample resolutions up to 24 bits.

Platforms

The aptX Lossless technology is implemented as C and C++ code and has been verified on

the following processors:

 x86

 ARM 9E

 ARM Cortex M3

 Texas Instruments C64xxother processor cores and DSPs to be verified and announced

Key Features

Compression ratio: 4:1

Audio Format: 16-bit, 44.1kHz (CD-Quality)

Data Rates: 352kbps

Frequency Response: 10Hz to 22kHz

Algorithmic Delay: <1.89ms @ Fs 48KHz

Dynamic Range: 16-bit: >92dB

THD+N: -68.8dB

If I had to guess, normal A2DP Bluetooth might sound as good as a 96kbps music file. While APT-X Bluetooth sounds as good as a 320kpbs music file. Essentially, to the trained ears it is a HUGE difference in sound quality.

The problem is, it's not a widespread codec yet. AFAIK, only the HTC One, One X, and Samsung Galaxy lineup (S3 and newer) and proably some of the other superphones that are one year or newer, will have this Codec. It's a proprietary codec. So you're only "allowed" to have it on your phone if you bought a phone that came with it.

Because of this, it's not found in any AOSP ROM's. Just like you won't find any Google Apps in AOSP, you won't find APT-X codecs. So as with Google Apps, we just simply offer a flashable zip so the end user can add those items if he/she wishes.

So, the aim for this thread is to have the same option for APT-X codec. Because I for one am tired of running stock ROM's just because I want to use the APT-X codec that I paid for when I bought my phone.

I personally am putting up $100 to any developer who can provide a flashable zip, or similar method, of getting an AOSP ROM to use the APT-X codec.

If anyone else reading this thread wishes to add money to the pledge, just PM me or make a notation in this thread. I'll add your pledge to my own.

Pledgers so far:

CZ Eddie - $100 (I paid off on my last pledge of $50 for USB audio on Galaxy S3)

farfrommovin - $20

emprize - $20

BenG7 - $30

Bom Simmons - $55

tr2ride - $50

DanBUK - $100

davidcie - $30

Bill Gates - $50

So, why can't we just copy & paste the codec into our existing AOSP ROM? Well, you can do that. But you still need to tell the ROM to actually use the codec. As of now, there is nothing that points to the codec so it gets used.

Attached to this thread are the four files that I assume are necessary. These were pulled from my AT&T Galaxy S4 running 4.3 Google Play Edition ROM.

I've also attached a logcat from my ROM using this codec. And am pasting below the logcat of an S3 ROM that is using the codec.

So, please dev community. Help us figure out how to get the APT-X Bluetooth codec integrated into any ROM we choose to run on the phone we bought that came with APT-X.

Thanks!

APT-X codec files:

- libbt-aptx-4.0.3.so

- libbt-codec-aptx.so

Possibly related codecs?

- libbluetooth_jni.so

- libbt-codec.so

Galaxy S3 logcat:

And here is a list of currently supported smartphones:

Apple	iPhone iOS 7

Fujitsu	ARROWS NX F-06E

Fujitsu	ARROWS X F-10D

Fujitsu	REGZA-T02D

HTC	Butterfly

HTC	Butterfly S

HTC	Desire 300

HTC	Desire 500

HTC	Desire 600 dual sim

HTC	Desire 601

HTC	Desire SV

HTC	Desire U

HTC	Desire X

HTC	Droid DNA

HTC	J

HTC	One

HTC	One S

HTC	One SV

HTC	One V

HTC	One X

HTC	One X Plus (X+)

HTC	One XL

HTC	One XT

HTC	One Max

HTC	One Mini

HTC One M8

LG G3

Motorola	DROID RAZR HD

Motorola	DROID RAZR M

Motorola	DROID RAZR MAXX HD

Motorola	RAZR

Motorola	RAZR MAXX

Nokia	none

Panasonic	Eluga P-03 Smartphone

Samsung	Galaxy Mega

Samsung	Galaxy Note II

Samsung	Galaxy S III (S3)

Samsung	Galaxy S III (S3) Mini

Samsung	Galaxy S IV (S4)

Samsung	Galaxy S IV (S4) Active

Samsung	Galaxy S IV (S4) Mini

Samsung Galaxy Note III

Samsung Galaxy S5

Sharp	102SH

Sharp	102SHII

Sharp	106SH

Sharp	107SH

Sharp	203SH

Sharp	IS15SH

Sharp	IS17SH

Sharp	ISW16SH

Sharp	Pantone 200SH

Sharp	SH01D

Sharp	SH-05E

Sharp	SH07D

Sharp	SH09D

Sharp	SHL21

Sharp	SHL22

Sony	Xperia Z Ultra

Vertu	Constellation