CODEWITHSUNDEEP
androidaudioandroid-ndkopenslaudioflinger
user1884325
user1884325

Reputation: 2550

Is it possible to get access to the speaker signal on Android?

Sending audio to the speaker for playback on Android is easy, but is it possible to get a copy of the actual final digital signal? Let's say I have 2 apps running "MyApp" and "SomeOtherApp". My app sends audio to the speaker, but so does "SomeOtherApp". "SomeOtherApp" is not my app - it's a 3rd party app. Is it possible to get a copy of the mixed audio signal which is played to the speaker by the OS? That is, the audio signal which is a mixture of the speaker signal from my app and the speaker signal from "SomeOtherApp".

To summarize: I am looking for a way to hook into the low-level audio path (HAL audio stream out - after mixing!) so I can get a copy of the "final" speaker signal (in real-time). Optimally, I would also like to hook into the low-level microphone path, but that's less of a concern right now.

Upvotes: 13

Views: 2103

Answers (2)

Flummox uses codidact.com
Flummox uses codidact.com

Reputation: 2189

Looks like the short answer is no.

Longer one is kinda. And sorta. But not really, as far as I know. Option 1: it might be a problem with respects to privacy. (not really a good option) Option 2: nobody thought it was needed, so did not build it into the system. Option 3: the amount of trouble shooting when programmers use the wrong source is just not worth it.

edit - You can, of course, record the input.

Upvotes: 3

O_Z
O_Z

Reputation: 1563

Checkthis one google example

Usage :

App will capture audio from android devices and playback on the same device; the playback on speaker will be captured immediately

*

Upvotes: 1

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