About echo cancellation

[TurboTu]

When two device output via speakphone and there will be much echo. Is there any method to add echo cancellation process?

[TurboTu]

I found webrtc has aec module, is there any hint about how to integrate it into the code

[mwarning]

I have some local code to enable AEC, but it is not tested yet.

[TurboTu]

I can do some test, can u share the code, or some tips how to ? I have tried use android.media.AudioTrack(not webrtc AudioTrack) and Speex to cancel the echo, and it worked. But I have no idea how to add the code into this project.

[TurboTu]

In my code, I should set sample rate at 8k and single track, enable aec, and use Speex at audio encoder and decoder, but webrtc has no entry. And in this project, I also tried disable the hardware echo cancellation and other code like below:
WebRtcAudioUtils.setDefaultSampleRateHz(8000)
WebRtcAudioUtils.setWebRtcBasedNoiseSuppressor(true)
WebRtcAudioUtils.setWebRtcBasedAcousticEchoCanceler(true)
WebRtcAudioUtils.setWebRtcBasedAutomaticGainControl(true)
var audioDeviceModule = JavaAudioDeviceModule.builder(App.getInstance())
.setUseHardwareAcousticEchoCanceler(false)
.setUseHardwareNoiseSuppressor(false)
.setSampleRate(8000)
.createAudioDeviceModule()
var initializationOptions = PeerConnectionFactory.InitializationOptions.builder(App.getInstance())
.createInitializationOptions()
PeerConnectionFactory.initialize(initializationOptions)
factory = PeerConnectionFactory.builder()
.setAudioDeviceModule(audioDeviceModule)
.setVideoEncoderFactory(encoderFactory)
.setVideoDecoderFactory(decoderFactory)
.createPeerConnectionFactory()

but all failed

[mwarning]

I would want to try this: https://webrtc.googlesource.com/src/+/refs/heads/main/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java#535

[TurboTu]

I have seen this code, dump the stream into a tmp file(like the aecDump method), and do aec ops? Am i right?

[mwarning]

Yes. But I would leave out the recording stuff.

[TurboTu]

Any detailed information? I don't understand? I searched over the internet, not too much talked about aec based on webrtc.

[mwarning]

The line with setSamplesReadyCallback seems to be for recording audio. Let's leave out that line out if you plan to make a merge request.

[TurboTu]

I'll have a try, thanks

[mwarning]

Did you get echo cancellation to work?

[mwarning]

I have added the JavaAudioDevice code. But it does not seem to work for me.