I want to create a C# web API for azure speech to text console application

Question

I have this following C# console application which uses azure speech to text service and converts speech taken from microphone input into text. I want to create a web API (using the endpoint id, subscription key and service region). Can anyone tell me how to do this?

C# code

using System;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CognitiveServices.Speech;
using Microsoft.CognitiveServices.Speech.Audio;

namespace Deployedsample1
{
    class Program
    {
        static string YourSubscriptionKey = "";
        static string YourServiceRegion = "centralindia";
        {
        static void OutputSpeechRecognitionResult(SpeechRecognitionResult 
               speechRecognitionResult)
        {
            switch (speechRecognitionResult.Reason)
        {
            case ResultReason.RecognizedSpeech:
                Console.WriteLine($"RECOGNIZED: Text={speechRecognitionResult.Text}");
                break;
            case ResultReason.NoMatch:
                Console.WriteLine($"NOMATCH: Speech could not be recognized.");
                break;
            case ResultReason.Canceled:
                var cancellation = CancellationDetails.FromResult(speechRecognitionResult);
                Console.WriteLine($"CANCELED: Reason={cancellation.Reason}");

                if (cancellation.Reason == CancellationReason.Error)
                {
                    Console.WriteLine($"CANCELED: ErrorCode={cancellation.ErrorCode}");
                    Console.WriteLine($"CANCELED: ErrorDetails={cancellation.ErrorDetails}");
                    Console.WriteLine($"CANCELED: Double check the speech resource key and region.");
                }
                break;
        }
    }


    async static Task Main(string[] args)
    {
       // var speechConfig = SpeechConfig.FromSubscription(YourSubscriptionKey, YourServiceRegion);
       
        var config = SpeechConfig.FromSubscription("", "centralindia");
        config.EndpointId = "";
        config.SpeechRecognitionLanguage = "en-US";
        var reco = new SpeechRecognizer(config);

        //To recognize speech from an audio file, use `FromWavFileInput` instead of `FromDefaultMicrophoneInput`:
        //using var audioConfig = AudioConfig.FromWavFileInput("YourAudioFile.wav");
        using var audioConfig = AudioConfig.FromDefaultMicrophoneInput();
        using var speechRecognizer = new SpeechRecognizer(config, audioConfig);

        Console.WriteLine("Speak into your microphone.");
        var speechRecognitionResult = await speechRecognizer.RecognizeOnceAsync();
        OutputSpeechRecognitionResult(speechRecognitionResult);
    }

}

}

Answer 1

I want to create a web API (using the endpoint id, subscription key and service region). Can anyone tell me how to do this?

To achieve the above requirement you can follow the below workaround to achieve it using web api:

public class Authentication
{
    public static readonly string FetchTokenUri =
        "https://westus.api.cognitive.microsoft.com/sts/v1.0/issueToken";
    private string subscriptionKey;
    private string token;

    public Authentication(string subscriptionKey)
    {
        this.subscriptionKey = subscriptionKey;
        this.token = FetchTokenAsync(FetchTokenUri, subscriptionKey).Result;
    }

    public string GetAccessToken()
    {
        return this.token;
    }

    private async Task<string> FetchTokenAsync(string fetchUri, string subscriptionKey)
    {
        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
            UriBuilder uriBuilder = new UriBuilder(fetchUri);

            var result = await client.PostAsync(uriBuilder.Uri.AbsoluteUri, null);
            Console.WriteLine("Token Uri: {0}", uriBuilder.Uri.AbsoluteUri);
            return await result.Content.ReadAsStringAsync();
        }
    }
}

For complete setup please refer this MICROSOFT DOCUMENTATION .