startRecording() called on an uninitialized AudioRecord

[ridozaen]

i got error when first trying to use this library based on example.

startRecording() called on an uninitialized AudioRecord

handlerStart() {
   Recording.init({
     bufferSize: 4096,
     sampleRate: 44100
   });
   Recording.start();
   Recording.on('recording', data => {
     console.log(data)
   })
 }

 render() {
   return (
     <View>
       <Text onPress={this.handlerStart}>Recording</Text>
     </View>
   );
 }

[qiuxiang]

Have you allowed microphone permission on your app?

[navrajkambo]

I got this error when using the android simulator. It's important to remember that the android simulator doesn't have a microphone (correct me if i'm wrong). Did you try debugging on an actual device?

[qiuxiang]

For android, I mainly test on real devices.

[speggos]

I am getting this error on a specific device (my other two devices run the code just fine!). The device is a little older, looking to see if you have any insight on this.

Device: ZTE Blade C321
Android Version: 4.4.2 'KitKat'

Code:

this.Recorder = require('react-native-recording').default;

this.Recorder.init({
    2048,
    44100
    16,
    1,
});

this.Recorder.addRecordingEventListener((data) => {
    const result = this.Detector.onNewBuffer(data);

    if (result && this.state.isRecording) {
        this.stopRecording();
    }
});

[navrajkambo]

Check the sample rate of your device.

[speggos]

Is there a way to check if the recording object was set up successfully?
Is there a way to programatically check the sample rate of the device? Haven't discovered any libraries supporting that functionality.

The app being developed requires support for as many older devices as possible

[navrajkambo]

In Java, you could write a loop that tries to instantiate an AudioRecord object with different sample rates.

public void getValidSampleRates() {
    for (int rate : new int[] {8000, 11025, 16000, 22050, 44100}) {  // add the rates you wish to check against
        int bufferSize = AudioRecord.getMinBufferSize(rate, AudioFormat.CHANNEL_CONFIGURATION_DEFAULT, AudioFormat.ENCODING_PCM_16BIT);
        if (bufferSize > 0) {
            // buffer size is valid, Sample rate supported

        }
    }
}

You could then add this functionality into a react-native package. For iOS, i'm not 100% sure, but I think all of the sample rates are the same.

[speggos]

Trying the looping method. I've discovered that the device works when the sample rate is set to 22050. Here is my current code, which is not working:

let potentialSampleRates = [44100, 22050, 16000];

for (let i=0; i<potentialSampleRates.length; i++) {
    try {
        this.Recorder.init({
            2048
            potentialSampleRates[i],
            16,
            1,
        });
        this.Recorder.start();

    } catch (error) {
        console.log('Error!', error);
        continue;
    }

    break;
}

What happens is that even though I try to start recording inside of a try block, I still get the red screen of death (ie it is not caught).

What I need to do is one of two things:

1. Be able to start recording on a buffer which has been initialized incorrectly, and then try another initialization.
2. Be able to tell if a recording instance has been initialized correctly BEFORE starting recording.

Any help to achieve either is greatly appreciated. I could not find anything within the recording object to satisfy option 2

[speggos]

Update: Got this working with my code. I had to fork this repo and make some changes which applies the looping process as stated by @navrajkambo (thank you!), except instead of checking bufferSize being >0, I check the audiorecord state.

Here is how I got it working:

int initializedCorrectly = -1;
int sampleRateInHz = 44100;

for (int rate : new int[] {44100, 22050, 16000, 11025, 8000}) {
        sampleRateInHz = rate;
        audioRecord = new AudioRecord(
                MediaRecorder.AudioSource.MIC,
                sampleRateInHz,
                channelConfig,
                audioFormat,
                this.bufferSize * 2
        );

        initializedCorrectly = audioRecord.getState();

        if (initializedCorrectly == AudioRecord.STATE_INITIALIZED) {
                break;
        }
}

Forked repo can be found here:

https://github.com/speggos/react-native-recording.git

[Keepo12]

I also tried to run the example from the library but got the error below:

TypeError: undefined is not an object (evaluating 'Recording.init')

This error is located at:
    in App (at withExpoRoot.js:22)
    in RootErrorBoundary (at withExpoRoot.js:21)
    in ExpoRootComponent (at renderApplication.js:34)
    in RCTView (at View.js:44)
    in RCTView (at View.js:44)
    in AppContainer (at renderApplication.js:33)

I'm using an Android device with the Expo app for testing and I set microphone permission to be on for Expo.

[speggos]

I'm unsure that you can use this library with Expo. You might want to look into that (I may be wrong).

If you cannot, you must eject the app, or use a different library (expo has one built in)

[sandeepReddyG]

I also tried to run the example from the library but got the error below:
TypeError: undefined is not an object (evaluating 'Recording.init')

This error is located at:
in App (at withExpoRoot.js:22)
in RootErrorBoundary (at withExpoRoot.js:21)
in ExpoRootComponent (at renderApplication.js:34)
in RCTView (at View.js:44)
in RCTView (at View.js:44)
in AppContainer (at renderApplication.js:33)

I'm using an Android device with the Expo app for testing and I set microphone permission to be on for Expo.

I am also facing same issue . I added permission in manifest file But still facing the issue. How to solve it?