Live API 的設定選項


即使是 Live API 的基本實作，您也能為使用者建構引人入勝的強大互動體驗。您也可以使用下列設定選項，進一步自訂體驗：


回覆語音和語言

您可以讓模型以特定聲音回覆，並影響模型以不同語言回覆。

指定回覆語音

按一下 Gemini API 供應商，即可在這個頁面查看供應商專屬內容和程式碼。

Live API 會使用 Chirp 3，以 HD 語音合成語音回覆。

如未指定回覆語音，預設為 Puck。

如要指定回覆語音，請在 speechConfig 物件中設定語音名稱，做為模型設定的一部分。

Swift 


// ...

let liveModel = FirebaseAI.firebaseAI(backend: .googleAI()).liveModel(
  modelName: "gemini-2.5-flash-native-audio-preview-09-2025",
  // Configure the model to use a specific voice for its audio response
  generationConfig: LiveGenerationConfig(
    responseModalities: [.audio],
    speech: SpeechConfig(voiceName: "VOICE_NAME")
  )
)

// ...

Kotlin 


// ...

val model = Firebase.ai(backend = GenerativeBackend.googleAI()).liveModel(
    modelName = "gemini-2.5-flash-native-audio-preview-09-2025",
    // Configure the model to use a specific voice for its audio response
    generationConfig = liveGenerationConfig {
        responseModality = ResponseModality.AUDIO
        speechConfig = SpeechConfig(voice = Voice("VOICE_NAME"))
    }
)

// ...

Java 


// ...

LiveGenerativeModel lm = FirebaseAI.getInstance(GenerativeBackend.googleAI()).liveModel(
    "gemini-2.5-flash-native-audio-preview-09-2025",
    // Configure the model to use a specific voice for its audio response
    new LiveGenerationConfig.Builder()
        .setResponseModality(ResponseModality.AUDIO)
        .setSpeechConfig(new SpeechConfig(new Voice("VOICE_NAME")))
        .build()
);

// ...

Web 


// ...

const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });

const liveModel = getLiveGenerativeModel(ai, {
  model: "gemini-2.5-flash-native-audio-preview-09-2025",
  // Configure the model to use a specific voice for its audio response
  generationConfig: {
    responseModalities: [ResponseModality.AUDIO],
    speechConfig: {
      voiceConfig: {
        prebuiltVoiceConfig: { voiceName: "VOICE_NAME" },
      },
    },
  },
});

// ...

Dart 


// ...

final _liveModel = FirebaseAI.googleAI().liveGenerativeModel(
  model: 'gemini-2.5-flash-native-audio-preview-09-2025',
  // Configure the model to use a specific voice for its audio response
  liveGenerationConfig: LiveGenerationConfig(
    responseModalities: [ResponseModalities.audio],
    speechConfig: SpeechConfig(voiceName: 'VOICE_NAME'),
  ),
);

// ...

Unity 


// ...

var liveModel = FirebaseAI.GetInstance(FirebaseAI.Backend.GoogleAI()).GetLiveModel(
    modelName: "gemini-2.5-flash-native-audio-preview-09-2025",
    // Configure the model to use a specific voice for its audio response
    liveGenerationConfig: new LiveGenerationConfig(
        responseModalities: new[] { ResponseModality.Audio },
        speechConfig: SpeechConfig.UsePrebuiltVoice("VOICE_NAME")
    )
);

// ...

影響回覆語言

Live API 模型會自動選擇適當的語言來回覆。

如要讓模型以非英文語言回覆，或一律以特定語言回覆，可以使用系統指示來影響模型的回覆，例如：

  • 向模型強調非英文語言可能較為合適

    Listen to the speaker carefully. If you detect a non-English language, respond
in the language you hear from the speaker. You must respond unmistakably in the
speaker's language.

  • 要求模型一律以特定語言回覆

    RESPOND IN LANGUAGE. YOU MUST RESPOND UNMISTAKABLY IN LANGUAGE.


音訊輸入和輸出內容的轉錄稿

按一下 Gemini API 供應商，即可在這個頁面查看供應商專屬內容和程式碼。

模型的回覆會包含語音輸入內容和模型語音回覆的轉錄稿。您可以在模型設定中設定這項設定。

  • 如要轉錄音訊輸入內容，請新增 inputAudioTranscription。

  • 如要轉錄模型的回覆音訊，請加入 outputAudioTranscription。

注意事項：

  • 您可以設定模型，傳回輸入和輸出內容的轉錄稿 (如下例所示)，也可以設定模型只傳回其中一種。

  • 轉錄稿會與音訊一起串流傳輸，因此最好像收集每個回合的文字部分一樣收集轉錄稿。

  • 轉錄語言是根據音訊輸入內容和模型的音訊回覆推斷而來。

Swift 


// ...

let liveModel = FirebaseAI.firebaseAI(backend: .googleAI()).liveModel(
  modelName: "gemini-2.5-flash-native-audio-preview-09-2025",
  // Configure the model to return transcriptions of the audio input and output
  generationConfig: LiveGenerationConfig(
    responseModalities: [.audio],
    inputAudioTranscription: AudioTranscriptionConfig(),
    outputAudioTranscription: AudioTranscriptionConfig()
  )
)

var inputTranscript: String = ""
var outputTranscript: String = ""

do {
  let session = try await liveModel.connect()
  for try await response in session.responses {
    if case let .content(content) = response.payload {
      if let inputText = content.inputAudioTranscription?.text {
        // Handle transcription text of the audio input
        inputTranscript += inputText
      }

      if let outputText = content.outputAudioTranscription?.text {
        // Handle transcription text of the audio output
        outputTranscript += outputText
      }

      if content.isTurnComplete {
        // Log the transcripts after the current turn is complete
        print("Input audio: \(inputTranscript)")
        print("Output audio: \(outputTranscript)")

        // Reset the transcripts for the next turn
        inputTranscript = ""
        outputTranscript = ""
      }
    }
  }


} catch {
  // Handle error
}

// ...

Kotlin 


// ...

val liveModel = Firebase.ai(backend = GenerativeBackend.googleAI()).liveModel(
    modelName = "gemini-2.5-flash-native-audio-preview-09-2025",
    // Configure the model to return transcriptions of the audio input and output
    generationConfig = liveGenerationConfig {
        responseModality = ResponseModality.AUDIO
        inputAudioTranscription = AudioTranscriptionConfig()
        outputAudioTranscription = AudioTranscriptionConfig()
   }
)

val liveSession = liveModel.connect()

fun handleTranscription(input: Transcription?, output: Transcription?) {
    input?.text?.let { text ->
        // Handle transcription text of the audio input
        println("Input Transcription: $text")
    }
    output?.text?.let { text ->
        // Handle transcription text of the audio output
        println("Output Transcription: $text")
    }
}

liveSession.startAudioConversation(null, ::handleTranscription)

// ...

Java 


// ...

ExecutorService executor = Executors.newFixedThreadPool(1);

LiveGenerativeModel lm = FirebaseAI.getInstance(GenerativeBackend.googleAI()).liveModel(
    "gemini-2.5-flash-native-audio-preview-09-2025",
    // Configure the model to return transcriptions of the audio input and output
    new LiveGenerationConfig.Builder()
            .setResponseModality(ResponseModality.AUDIO)
            .setInputAudioTranscription(new AudioTranscriptionConfig())
            .setOutputAudioTranscription(new AudioTranscriptionConfig())
            .build()
    );

LiveModelFutures liveModel = LiveModelFutures.from(lm);
ListenableFuture sessionFuture = liveModel.connect();

Futures.addCallback(sessionFuture, new FutureCallback() {
    @Override
    public void onSuccess(LiveSessionFutures ses) {
        LiveSessionFutures session = ses;
        session.startAudioConversation((Transcription input, Transcription output) -> {
            if (input != null) {
                // Handle transcription text of the audio input
                System.out.println("Input Transcription: " + input.getText());
            }
            if (output != null) {
                // Handle transcription text of the audio output
                System.out.println("Output Transcription: " + output.getText());
            }
            return null;
        });
    }

    @Override
    public void onFailure(Throwable t) {
        // Handle exceptions
        t.printStackTrace();
    }
}, executor);

// ...

Web 


// ...

const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });

const liveModel = getLiveGenerativeModel(ai, {
  model: 'gemini-2.5-flash-native-audio-preview-09-2025',
  // Configure the model to return transcriptions of the audio input and output
  generationConfig: {
    responseModalities: [ResponseModality.AUDIO],
    inputAudioTranscription: {},
    outputAudioTranscription: {},
  },
});

const liveSession = await liveModel.connect();

liveSession.sendAudioRealtime({ data, mimeType: "audio/pcm" });

const messages = liveSession.receive();
for await (const message of messages) {
  switch (message.type) {
    case 'serverContent':
      if (message.inputTranscription) {
        // Handle transcription text of the audio input
        console.log(`Input transcription: ${message.inputTranscription.text}`);
      }
      if (message.outputTranscription) {
        // Handle transcription text of the audio output
        console.log(`Output transcription: ${message.outputTranscription.text}`);
      } else {
      	 // Handle other message types (modelTurn, turnComplete, interruption)
      }
    default:
      // Handle other message types (toolCall, toolCallCancellation)
  }
}

// ...

Dart 


// ...

final _liveModel = FirebaseAI.googleAI().liveGenerativeModel(
  model: 'gemini-2.5-flash-native-audio-preview-09-2025',
  // Configure the model to return transcriptions of the audio input and output
  liveGenerationConfig: LiveGenerationConfig(
    responseModalities: [ResponseModalities.audio],
    inputAudioTranscription: AudioTranscriptionConfig(),
    outputAudioTranscription: AudioTranscriptionConfig(),
  ),
);

final LiveSession _session = _liveModel.connect();

await for (final response in _session.receive()) {
  LiveServerContent message = response.message;
  if (message.inputTranscription?.text case final inputText?) {
    // Handle transcription text of the audio input
    print('Input: $inputText');
  }

  if (message.outputTranscription?.text case final outputText?) {
    // Handle transcription text of the audio output
    print('Output: $outputText');
  }
}

// ...

Unity 


// ...

var liveModel = FirebaseAI.GetInstance(FirebaseAI.Backend.GoogleAI()).GetLiveModel(
    modelName: "gemini-2.5-flash-native-audio-preview-09-2025",
    // Configure the model to return transcriptions of the audio input and output
    liveGenerationConfig: new LiveGenerationConfig(
        responseModalities: new[] { ResponseModality.Audio },
        inputAudioTranscription: new AudioTranscriptionConfig(),
        outputAudioTranscription: new AudioTranscriptionConfig()
    )
);

try
{
    var session = await liveModel.ConnectAsync();
    var stream = session.ReceiveAsync();
    await foreach (var response in stream) {
        if (response.Message is LiveSessionContent sessionContent) {
            if (!string.IsNullOrEmpty(sessionContent.InputTranscription?.Text)) {
              // handle transcription text of input audio
            }

            if (!string.IsNullOrEmpty(sessionContent.OutputTranscription?.Text)) {
              // handle transcription text of output audio
            }
        }
    }
}
catch (Exception e)
{
    // Handle error
}

// ...


語音活動偵測 (VAD)

模型會對連續音訊輸入串流自動執行語音活動偵測 (VAD)。VAD 預設為啟用。


工作階段管理

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