Process the text once voice input is stopped from SFSpeechRecognizer

Question

I am developing a Voice to Text application using iOS SFSpeechRecognizer API.

Found a great tutorial here: and it worked fine.

I wanted to process the text and perform some action as soon as the voice input is stopped. So, was curious whether there is a delegate method available for SFSpeechRecognizer which can recognise when the voice input is stopped so that I can capture the input and process further?

Answer 1

So, was curious whether there is a delegate method available for SFSpeechRecognizer which can recognise when the voice input is stopped so that I can capture the input and process further?

Not built into the SFSpeechRecognizer API, no. On the contrary, that is exactly why you must provide interface that allows the user to tell the recognizer that the input is finished (eg a Done button of some sort). Your app will be rejected if you omit that interface.

Answer 2

A possible solution maybe to use a third party library like FDSoundActivatedRecorder which start recording when sound is detected and stops recording when the user is done talking.

Then you can use the recorded audio as in this link to convert it to text in a go.

func transcribeAudio(url: URL) {
    // create a new recognizer and point it at our audio
    let recognizer = SFSpeechRecognizer()
    let request = SFSpeechURLRecognitionRequest(url: url)

    // start recognition!
    recognizer?.recognitionTask(with: request) { [unowned self] (result, error) in
        // abort if we didn't get any transcription back
        guard let result = result else {
            print("There was an error: \(error!)")
            return
        }

        // if we got the final transcription back, print it
        if result.isFinal {
            // pull out the best transcription...
            print(result.bestTranscription.formattedString)
        }
    }
}