Record Room Audio during a Phonne Call

Question

Record Room Audio during a Phonne Call

Universal Camera 276

My Xamarin.Forms App works great for recording Room Audio but produces total silence recording during a Phone call...

. if (mediaRecorder == null)
{
Task.Run(() =>
{
var path = new File(Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryMusic), "Audio_Recorded.3gp");
mediaRecorder = new MediaRecorder();
mediaRecorder.Reset();
mediaRecorder.SetAudioSource(AudioSource.VoiceCommunication);
mediaRecorder.SetOutputFormat(OutputFormat.ThreeGpp);
mediaRecorder.SetAudioEncoder(AudioEncoder.AmrNb);
mediaRecorder.SetOutputFile(path.AbsolutePath);
mediaRecorder.Prepare();
mediaRecorder.Start();// Recording is now started
});
}

Following Run-Time Permissions are being Granted except for ... Manifest.Permission.CaptureAudioOutput,

    public static string[] PERMISSIONS_REQUIRED =
    {
        Manifest.Permission.Camera,
        Manifest.Permission.WriteExternalStorage,
        Manifest.Permission.CaptureAudioOutput,
        Manifest.Permission.ModifyAudioSettings,
        Manifest.Permission.RecordAudio,
        Manifest.Permission.WakeLock,
        Manifest.Permission.AccessNetworkState,
        Manifest.Permission.ReadExternalStorage
    };

Does my Silent Recording stem from improper Permissions? If so how to resolve Manifest.Permission.CaptureAudioOutput.

If its another issue then how do I fix That????

1 answer

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Answer 1

Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Microsoft External Staff

Hello,

produces total silence recording during a Phone call...

Referring to the official documentation about MediaRecorder, we can find that:

Capturing from VOICE_CALL source requires the Manifest.permission.CAPTURE_AUDIO_OUTPUT permission. This permission is reserved for use by system components and is not available to third-party applications.

That's the reason the issue occurs.

Best Regards,

Alec Liu.

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Universal Camera 276 Reputation points

2022-05-11T05:33:09.763+00:00

can you please tell me how i can meet my objective of room recording during phone call

thank you!
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2022-05-11T05:57:19.797+00:00

It's no possible to record phone calls using a regular app by conventional means.

As the documentation says, this permission is not available to third-party applications.

This feature will compromise the security of the system, therefore, we could not to provide the solution about it.

If it is useful for you, could you please mark this answer? It would be helpful for others who meet the same issue.:)
Universal Camera 276 Reputation points

2022-05-11T06:07:16.927+00:00

I am not interested in the phone call...I am only interested in the room. So how can i record room during a phone call? Off course I can carry a second phone and use that as a room recorder. But I don't want to carry two phones!!!!

Help will be Kindly appreciated. By the way my source is MIC not VOICE_CALL.

Thank You!!!!!!!!!!
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2022-05-11T06:20:59.653+00:00

When the phone call starts, the Mic access is moved to the priority app. Your app will no longer have access to the mic if it's an ordinary app. However, if your app has an Accessibility service, you can share the Mic.

You could refer to this documentation Sharing audio input to get more details about how to share audio input.:)
Universal Camera 276 Reputation points

2022-05-11T12:16:29.297+00:00

That was helpful. So I dug into it and I learned that its a huge ocean. I am just a little fish looking for a room recording.

Most of the documentation is Java based which i am not very savvy with. Then there is talk about trusted APK. A huge ocean.

Can you share a Method???

Thank you kindly!!!!
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2022-05-12T02:14:05.977+00:00

This requires high android permissions, therefore, we could not provide the solution to you.

Thanks for your understanding.
Universal Camera 276 Reputation points

2022-05-15T00:04:57.233+00:00

Sorry for the late response as I was digesting "I hope you understand".

So this is what I understand...

Android PhoneApp is native to the operating system requiring exclusive privileges for AudioOutput that cannot be consented by average people like me while I'm using my AidiRecorder App.

Therefore...

What if I write my own Telephone App. Can I use that App to Replace the Native PhoneApp?

If So...

Can I provide RunTime permission for AudioRecorder to have RecordAudioOutput consent using My New PhoneApp during a call?

You do realize that I'm not interested in recording the phone conversation it's just I want to CONTINUE to be able to record the room if and when the phone call is coming in and is being answered.

Thank you kindly!
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2022-05-16T06:34:21.747+00:00

In the case of Voice call + ordinary app, we need to use the permission of Manifest.Permission.CaptureAudioOutput anyway.

However, this permission is reserved for use by system components and is not available to third-party applications.
Universal Camera 276 Reputation points

2022-05-16T10:33:11.767+00:00

You mentioned "if your app has an Accessibility service, you can share the Mic." Can you Please provide a code sample that can help share. My research only provided JavaScript.

Thank you!!!!
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff

2022-05-17T02:19:25.97+00:00

For Accessibility service, you could share the audio input by "listening," like the Google Assistant or an accessibility service that respond to voice commands.

For the function Record Room Audio during a Phonne Call, it would also require the permission Manifest.Permission.CaptureAudioOutput.

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Record Room Audio during a Phonne Call

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