Investigate supporting host audio recording

[JakeWharton]

If this is relatively easy to do we should just support it. Android supports this feature, but I have no idea how to leverage root for permission escalation.

[NightlyNexus]

Specifically, we need CAPTURE_AUDIO_OUTPUT. I think it'd require checking for the su command, and granting the permission with the package manager (pm).

[monxalo]

Here's a library which may simplify the root access.

[JakeWharton]

@monxalo If it's not available via Maven Central as an aar or jar we probably won't use it for simplicity sake.

[monxalo]

Okay, I found another which is based on the previous one. This one is published on maven central, might be worth checking out.

[JakeWharton]

Apache 2 is not compatible with GPLv2

[grigala]

Have you guys seen Play Games latest feature "Record Gameplay"? Basically they are using mic to record audio, at least we can do the same using OpenSL ES.

[JakeWharton]

I personally don't want ambient sound picked up. It would be great to get the raw audio.

On Sun, Jun 19, 2016, 6:16 PM Giorgi Grigalashvili notifications@github.com wrote:

Have you guys seen Play Games https://play.google.com/store/apps/details?id=com.google.android.play.games&hl=en latest feature "Record Gameplay"? Basically they are using mic to record audio, at least we can do the same using OpenSL ES https://developer.android.com/ndk/guides/audio/opensl-for-android.html.

[image: Screenshot] https://camo.githubusercontent.com/f132de3f37df88620ed4b365265b185562414a3c/687474703a2f2f692e696d6775722e636f6d2f35456d35534a482e6a7067

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[monxalo]

Here's more info about this:

CAPTURE_AUDIO_OUTPUT has protection level of signatureOrSystem.

Android docs states:

A permission that the system grants only to applications that are in the Android system image or that are signed with the same certificate as the application that declared the permission. Please avoid using this option, as the signature protection level should be sufficient for most needs and works regardless of exactly where applications are installed. The "signatureOrSystem" permission is used for certain special situations where multiple vendors have applications built into a system image and need to share specific features explicitly because they are being built together.

Which means, for the time being, even with root, we're not going to be able to acquire this permission level.

[thecyberd3m0n]

If even with root this is not possible, maybe we need custom kernel/Android Fork. Android is Open Source, so just fork it with CAPTURE_AUDIO_OUTPUT availabe. I'll start research

[BruceBayne]

it is possible to RESIGN all system packages with new signature, after that clean dalvick-cache e.t.c.

After that, you can sign any package with same signature, and this open gate for CAPTURE_AUDIO_OUTPUT

This process is not very hard but you can't deploy it as simple ClickMe.apk

[JakeWharton]

https://android-developers.googleblog.com/2019/07/capturing-audio-in-android-q.html