gemini-multimodal-live-dev-guide/part_2_dev_api/chapter_06/index.html at main · ffesseler/gemini-multimodal-live-dev-guide · GitHub

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<!DOCTYPE html>
<!--
 Copyright 2024 Google LLC

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->

<html>
<head>
  <title>Gemini Multimodal WebSocket Demo (Dev API)</title>
  <link rel="stylesheet" href="http://localhost:8000/shared/style.css">
  <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20..48,100..700,0..1,-50..200" />
</head>
<body>
  <div class="header-section">
    <h1>Gemini Multimodal Chat (Dev API)</h1>
    <p>This application demonstrates real-time multimodal interaction using the Gemini API and WebSockets. Speak into your microphone and optionally share your webcam or screen to engage in a rich multimedia conversation.</p>
  </div>

  <div class="input-container">
    <button id="micButton" onclick="toggleMicrophone()" disabled class="action-button">
      <span class="material-symbols-outlined">mic</span>
    </button>
    <button id="webcamButton" onclick="toggleWebcam()" class="action-button">
      <span class="material-symbols-outlined">videocam</span>
    </button>
    <button id="screenButton" onclick="toggleScreen()" class="action-button">
      <span class="material-symbols-outlined">present_to_all</span>
    </button>
  </div>
  <div class="video-container">
    <video id="videoPreview" autoplay playsinline class="hidden"></video>
  </div>
  <div id="output"></div>

  <!-- Load EventEmitter3 first -->
  <script src="https://cdn.jsdelivr.net/npm/eventemitter3@5.0.1/dist/eventemitter3.umd.min.js"></script>

  <!-- Load our API class -->
  <script src="http://localhost:8000/shared/gemini-live-api.js"></script>

  <!-- Then load our module code -->
  <script type="module">
    import { AudioRecorder } from 'http://localhost:8000/shared/audio-recorder.js';
    import { AudioStreamer } from 'http://localhost:8000/shared/audio-streamer.js';
    import { MediaHandler } from 'http://localhost:8000/shared/media-handler.js';

    const output = document.getElementById('output');
    const apiKey = '<YOUR_API_KEY>'; // Replace with your actual API key
    const host = 'generativelanguage.googleapis.com';
    const endpoint = `wss://${host}/ws/google.ai.generativelanguage.v1alpha.GenerativeService.BidiGenerateContent?key=${apiKey}`;

    let audioContext;
    let audioStreamer;
    let audioRecorder;
    let isRecording = false;
    let initialized = false;
    let isInterrupted = false;
    let mediaHandler;
    let geminiAPI = new GeminiLiveAPI(endpoint);

    document.addEventListener('DOMContentLoaded', () => {
      mediaHandler = new MediaHandler();
      mediaHandler.initialize(document.getElementById('videoPreview'));
      // Initial setup of handlers
      setupGeminiHandlers();
    });

    // Initialize audio when sending the first message
    async function ensureAudioInitialized() {
      if (!initialized) {
        audioContext = new (window.AudioContext || window.webkitAudioContext)({ sampleRate: 24000 });
        audioStreamer = new AudioStreamer(audioContext);
        await audioContext.resume();
        initialized = true;
        console.log('Audio context initialized:', audioContext.state);
      }
    }

    async function playAudioChunk(base64AudioChunk) {
      try {
        await ensureAudioInitialized();
        const arrayBuffer = base64ToArrayBuffer(base64AudioChunk);
        const uint8Array = new Uint8Array(arrayBuffer);
        audioStreamer.addPCM16(uint8Array);
        audioStreamer.resume();
      } catch (error) {
        console.error('Error queuing audio chunk:', error);
      }
    }

    async function startRecording() {
      try {
        await ensureAudioInitialized();

        // Reset state when starting new recording
        isInterrupted = false;
        audioStreamer.stop();  // Clean up any previous audio state

        // Reinitialize Gemini API if WebSocket is closed
        if (geminiAPI.ws.readyState !== WebSocket.OPEN) {
          geminiAPI = new GeminiLiveAPI(endpoint);
          // Reattach event handlers
          setupGeminiHandlers();
          // Wait for the connection to be ready
          await new Promise((resolve) => {
            geminiAPI.onSetupComplete = () => {
              resolve();
              document.getElementById('micButton').disabled = false;
            };
          });
        }

        audioRecorder = new AudioRecorder();
        await audioRecorder.start();

        audioRecorder.on('data', (base64Data) => {
          geminiAPI.sendAudioChunk(base64Data);
        });

        logMessage('Recording started...');
        isRecording = true;
        document.getElementById('micButton').innerHTML = '<span class="material-symbols-outlined">stop</span>';
      } catch (error) {
        console.error('Error starting recording:', error);
        logMessage('Error starting recording: ' + error.message);
      }
    }

    function stopRecording() {
      if (audioRecorder) {
        audioRecorder.stop();
        audioRecorder.off('data');
        logMessage('Recording stopped.');
        isRecording = false;
        document.getElementById('micButton').innerHTML = '<span class="material-symbols-outlined">mic</span>';

        // Stop video streams when stopping recording
        mediaHandler.stopAll();
        document.getElementById('webcamButton').innerHTML =
          '<span class="material-symbols-outlined">videocam</span>';
        document.getElementById('screenButton').innerHTML =
          '<span class="material-symbols-outlined">present_to_all</span>';

        // Send end message before closing
        geminiAPI.sendEndMessage();
      }
    }

    // Function to set up Gemini API event handlers
    function setupGeminiHandlers() {
      geminiAPI.onSetupComplete = () => {
        document.getElementById('micButton').disabled = false;
      };

      geminiAPI.onAudioData = async (audioData) => {
        if (!audioStreamer.isPlaying) {
          logMessage('Gemini: Speaking...');
        }
        await playAudioChunk(audioData);
      };

      geminiAPI.onInterrupted = () => {
        logMessage('Gemini: Interrupted');
        isInterrupted = true;
        audioStreamer.stop();
      };

      geminiAPI.onTurnComplete = () => {
        logMessage('Gemini: Finished speaking');
        isInterrupted = false;  // Reset interruption state
        audioStreamer.complete();
      };

      geminiAPI.onError = (message) => {
        logMessage(message);
      };

      geminiAPI.onClose = (event) => {
        logMessage(`Connection closed`);
      };
    }

    // Make toggleMicrophone available globally
    window.toggleMicrophone = function() {
      if (isRecording) {
        stopRecording();
      } else {
        startRecording();
      }
    };

    function base64ToArrayBuffer(base64) {
      const binaryString = atob(base64);
      const bytes = new Uint8Array(binaryString.length);
      for (let i = 0; i < binaryString.length; i++) {
        bytes[i] = binaryString.charCodeAt(i);
      }
      return bytes.buffer;
    }

    function logMessage(message) {
      const messageElement = document.createElement('p');
      messageElement.textContent = message;
      output.appendChild(messageElement);
    }

    window.toggleWebcam = async function() {
      if (mediaHandler.isWebcamActive) {
        mediaHandler.stopAll();
        document.getElementById('webcamButton').innerHTML =
          '<span class="material-symbols-outlined">videocam</span>';
      } else {
        const success = await mediaHandler.startWebcam();
        if (success) {
          document.getElementById('webcamButton').innerHTML =
            '<span class="material-symbols-outlined">videocam_off</span>';
          mediaHandler.startFrameCapture((base64Image) => {
            if (geminiAPI.ws.readyState === WebSocket.OPEN) {
              const message = {
                realtimeInput: {
                  mediaChunks: [{
                    mime_type: "image/jpeg",
                    data: base64Image
                  }]
                }
              };
              geminiAPI.ws.send(JSON.stringify(message));
            }
          });
        }
      }
    };

    window.toggleScreen = async function() {
      if (mediaHandler.isScreenActive) {
        mediaHandler.stopAll();
        document.getElementById('screenButton').innerHTML =
          '<span class="material-symbols-outlined">present_to_all</span>';
      } else {
        const success = await mediaHandler.startScreenShare();
        if (success) {
          document.getElementById('screenButton').innerHTML =
            '<span class="material-symbols-outlined">cancel_presentation</span>';
          mediaHandler.startFrameCapture((base64Image) => {
            if (geminiAPI.ws.readyState === WebSocket.OPEN) {
              const message = {
                realtimeInput: {
                  mediaChunks: [{
                    mime_type: "image/jpeg",
                    data: base64Image
                  }]
                }
              };
              geminiAPI.ws.send(JSON.stringify(message));
            }
          });
        }
      }
    };
  </script>
</body>
</html>