using GenerativeAI;
using GenerativeAI.Types;

var model = new GenerativeModel(apiKey, GoogleAIModels.Gemini38FlashTts);

var request = new GenerateContentRequest
{
    GenerationConfig = new GenerationConfig
    {
        ResponseModalities = new List<Modality> { Modality.AUDIO },
        SpeechConfig = new SpeechConfig
        {
            VoiceConfig = new VoiceConfig
            {
                PrebuiltVoiceConfig = new PrebuiltVoiceConfig { VoiceName = "Kore" }
            },
            LanguageCode = "en-US" // optional, BCP 47
        }
    }
};
request.AddText("Say cheerfully: Have a wonderful day!");

var response = await model.GenerateContentAsync(request);

var audio = response.Candidates?[0].Content?.Parts.FirstOrDefault(p => p.InlineData != null)?.InlineData;
if (audio?.Data != null)
{
    byte[] pcm = Convert.FromBase64String(audio.Data);
    Console.WriteLine($"Received {pcm.Length} bytes of {audio.MimeType}");
}

var config = new GenerationConfig
{
    ResponseModalities = new List<Modality> { Modality.AUDIO },
    SpeechConfig = new SpeechConfig
    {
        MultiSpeakerVoiceConfig = new MultiSpeakerVoiceConfig
        {
            SpeakerVoiceConfigs = new List<SpeakerVoiceConfig>
            {
                new() { Speaker = "Joe",  VoiceConfig = new VoiceConfig { PrebuiltVoiceConfig = new PrebuiltVoiceConfig { VoiceName = "Kore" } } },
                new() { Speaker = "Jane", VoiceConfig = new VoiceConfig { PrebuiltVoiceConfig = new PrebuiltVoiceConfig { VoiceName = "Puck" } } }
            }
        }
    }
};

var model = new GenerativeModel(apiKey, GoogleAIModels.Gemini38FlashTts, config: config);

var response = await model.GenerateContentAsync(
    "TTS the following conversation between Joe and Jane:\nJoe: How's it going today, Jane?\nJane: Not too bad, how about you?");

using GenerativeAI.Live.Helper; // Google_GenerativeAI.Live package

byte[] wav = AudioHelper.AddWaveHeader(pcm, numberOfChannels: 1, sampleRate: 24000, bitsPerSample2: 16);
await File.WriteAllBytesAsync("speech.wav", wav);