Audio Recording Failure in Webrtc Android

[Phil]

Hi guys,

I'm getting the following error in my Audio call in android.

E/AudioRecord: start() status -38

E/org.webrtc.Logging: WebRtcAudioRecord: Start recording error: AUDIO_RECORD_START_STATE_MISMATCH. AudioRecord.startRecording failed - incorrect state :1

E/AudioRecordJni: StartRecording failed!

How to overcome this issue. I'm using webrtc M62 build.

Please help me. 

Thanks in Advance.

Regards,

Phil

[Henrik Andreasson]

First of all you are on a very old version and should update to latest (M73).

The described issue can happen (but it should be a very rare event) on some devices when there is some sort of microphone issue:

conflict with other app, old call not properly closed, etc. and usually a fresh start will resolve the problem.

If the issue happens always, file a bug and add more details.

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[Phil]

Hi,

I'm using multiple peerconnection in my project in same time. Does that make any problem in this case? And I'm calling peerconnection.release() and peerconnectionfactory.release() properly. should I need to release any thing related to audio stream. plz help.

Regards,

Phil.

[Henrik Andreasson]

Each PC creates/contains one ADM and most likely that is the problem in your case.

Hence, ADM1 is active when ADM2 want's to start recording. You can only have one active PC/ADM in WebRTC on Android.

Analyzing logcat outputs will probably show exactly what happens but the general solution is to ensure that only one ADM is active.

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[Henrik Andreasson]

If none is injected externally by the user, a default ADM is created as part of each PC here:

https://cs.chromium.org/chromium/src/third_party/webrtc/media/engine/webrtc_voice_engine.cc?type=cs&q=AudioDeviceModule::Create&sq=package:chromium&g=0&l=238

I assume you do this twice in your example and that will fail on Android.

On Mon, Feb 18, 2019 at 4:07 PM Phil <ayyapp...@gmail.com> wrote:

Hi Henrik,

Thank you for the answer.

 Could you please tell what is ADM in this case?. I'm not externally creating that one.

Regards,

Ayyappan N

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[Phil]

Thank you Henrik.

Sorry for accident deletion of above message.