Acoustic echo / feedback with android tutorial app, when using speaker mode

[kiran-pn]

Hello,

I am using the Android-sample app from here: https://github.com/OpenVidu/openvidu-tutorials/tree/master/openvidu-android

I added the following Audio-Manager related code when the socket is connected, to make the the sound come out from the device's speaker. Without that, the sound actually plays from the earpiece instead of the speaker:
audioManager.setSpeakerphoneOn(true); audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);

So, when using the app with 2 mobile devices, we observe that there is a lot of echo. See below scenario:
• Person A & Person B joined the session.
• Person A says "Hello!"
• Person B hears 'Hello' on his device speaker, & this again gets transmitted back to Person A & he also hears his 'Hello' back as an echo.

Needless to say, this doesn't provide a very good experience when conversing.

We found that the issue isn't present when using other apps based on WebRTC on the same set of devices, so this isn't a hardware issue.

I tried to use the following in the code, but it didn't help either:
WebRtcAudioUtils.setWebRtcBasedAcousticEchoCanceler(true); WebRtcAudioUtils.setWebRtcBasedNoiseSuppressor(true);

@pabloFuente / @CSantosM : Is there any way to minimize/eliminate this somehow? Either via server-side config changes or from the app-side?
Also, is there a plan to update the Android-tutorial app to use the 'Unified Plan' from WebRTC? (See: https://webrtc.org/web-apis/chrome/unified-plan/ )

[tibinvpaul]

Hey, @pabloFuente - could you help with this, please?

[jaswant0605]

You can fix this by disabling the hardware based AEC and Noise Suppressor.

Took me a while to figure this out but

WebRtcAudioUtils.setWebRtcBasedAcousticEchoCanceler(true); 
WebRtcAudioUtils.setWebRtcBasedNoiseSuppressor(true);

Didn't worked for me. Instead I fixed it by setting audio device module parameter in Session.java. this will surely fix your issue.

Also please make sure both the devices aren't near each other, else there will be a lot of echo!.

AudioDeviceModule adm = createAudioDeviceModule();

 peerConnectionFactory = PeerConnectionFactory.builder()

                .setVideoEncoderFactory(encoderFactory)

                .setVideoDecoderFactory(decoderFactory)

                .setAudioDeviceModule(adm)

                .setOptions(options)

                .createPeerConnectionFactory();

 private AudioDeviceModule createAudioDeviceModule() {

        return builder(activity)

                .setAudioSource(MediaRecorder.AudioSource.MIC)

                .setUseHardwareAcousticEchoCanceler(false)

                .setUseHardwareNoiseSuppressor(false)

                // .setInputSampleRate(16000)

                .createAudioDeviceModule();

    }

[Caerbannog]

Hi,

I'm not using OpenVidu, but for your information, some other projects decided to call setWebRtcBasedAcousticEchoCanceler(false) on specific phone models.
See: signalapp/Signal-Android#7635