Text-to-Speech in C#

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This sample demonstrates how to use the Azure Text-to-Speech API in a C# console application.

Program.cs
TextToSpeechClass.cs

How to generate this sample

Command

ai dev new text-to-speech --csharp

Output

AI - Azure AI CLI, Version 1.0.0
Copyright (c) 2024 Microsoft Corporation. All Rights Reserved.

This PUBLIC PREVIEW version may change at any time.
See: https://aka.ms/azure-ai-cli-public-preview

Generating 'text-to-speech' in 'text-to-speech-cs' (3 files)...

TextToSpeech.csproj
TextToSpeechClass.cs
Program.cs

Generating 'text-to-speech' in 'text-to-speech-cs' (3 files)... DONE!

Program.cs

STEP 1: Read the configuration settings from environment variables:

Program.cs

var azureAPIKey = Environment.GetEnvironmentVariable("AZURE_API_KEY") ?? "<insert your Azure API key here>";
var azureRegion = Environment.GetEnvironmentVariable("AZURE_REGION") ?? "<insert your Azure region here>";

STEP 2: Initialize the helper class with the configuration settings:

Program.cs

var tts = new TextToSpeechClass(azureAPIKey, azureRegion);

STEP 3: Obtain user input, use the helper class to synthesize speech, and play the audio output:

Program.cs

while (true)
{
    Console.Write("Text to synthesize: ");
    var text = Console.ReadLine();
    if (string.IsNullOrEmpty(text) || text == "exit") break;

    var audioData = await tts.SynthesizeSpeechAsync(text);
    // Code to play audioData
}

TextToSpeechClass.cs

STEP 1: Create the client and initialize the speech synthesis service:

TextToSpeechClass.cs

public TextToSpeechClass(string azureAPIKey, string azureRegion)
{
    var config = SpeechConfig.FromSubscription(azureAPIKey, azureRegion);
    _synthesizer = new SpeechSynthesizer(config);
}

STEP 2: Synthesize speech from text input:

TextToSpeechClass.cs

public async Task<byte[]> SynthesizeSpeechAsync(string text)
{
    using var result = await _synthesizer.SpeakTextAsync(text);
    if (result.Reason == ResultReason.SynthesizingAudioCompleted)
    {
        return result.AudioData;
    }
    else
    {
        throw new Exception("Speech synthesis failed.");
    }
}