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import {
LitElement,
html,
} from 'https://cdn.jsdelivr.net/gh/lit/dist@3/core/lit-core.min.js';
class AudioPlayer extends LitElement {
static properties = {
playEvent: {type: String},
stopEvent: {type: String},
enabled: {type: Boolean},
data: {type: String},
};
constructor() {
super();
this.enabled = false;
this.audioContext = null; // Initialize audio context
this.sampleRate = 24000; // Gemini Live API sends data in 24000hz
this.channels = 1;
this.queue = [];
this.isPlaying = false;
this.onGeminiLiveStarted = (e) => {
if (!this.enabled) {
this.playAudio();
}
};
this.onGeminiLiveStopped = (e) => {
this.dispatchEvent(new MesopEvent(this.stopEvent, {}));
};
this.onAudioOutputReceived = (e) => {
this.addToQueue(e.detail.data);
};
}
connectedCallback() {
super.connectedCallback();
window.addEventListener(
'audio-output-received',
this.onAudioOutputReceived,
);
window.addEventListener(
'gemini-live-api-started',
this.onGeminiLiveStarted,
);
window.addEventListener(
'gemini-live-api-stopped',
this.onGeminiLiveStopped,
);
}
disconnectedCallback() {
super.disconnectedCallback();
if (this.audioContext) {
this.audioContext.close();
}
window.removeEventListener(
'audio-output-received',
this.onAudioInputReceived,
);
window.removeEventListener(
'gemini-live-api-started',
this.onGeminiLiveStarted,
);
window.removeEventListener(
'gemini-live-api-stopped',
this.onGeminiLiveStopped,
);
}
firstUpdated() {
if (this.enabled) {
this.playAudio();
}
}
updated(changedProperties) {
// Add audio chunks to queue to play.
if (changedProperties.has('data') && this.data.length > 0) {
this.addToQueue(this.data);
}
// Clear the queue if the audio player is disabled.
if (changedProperties.has('enabled') && !this.enabled) {
this.queue = [];
}
}
addToQueue(base64Data) {
if (!this.enabled) {
return;
}
this.queue.push(base64Data);
if (!this.isPlaying) {
this.playNext();
}
}
playAudio() {
if (!this.enabled) {
this.dispatchEvent(new MesopEvent(this.playEvent, {}));
}
if (!this.audioContext) {
this.audioContext = new AudioContext();
}
this.playNext();
}
playNext() {
if (!this.enabled || !this.audioContext || this.queue.length === 0) {
this.isPlaying = false;
return;
}
this.isPlaying = true;
const data = this.queue.shift();
const source = this.playPCM(data);
source.onended = () => {
this.playNext();
};
}
playPCM(data) {
// Convert base64 to binary.
const binaryAudio = atob(data);
// Convert binary string to ArrayBuffer.
const audioBuffer = new ArrayBuffer(binaryAudio.length);
const bufferView = new Uint8Array(audioBuffer);
for (let i = 0; i < binaryAudio.length; i++) {
bufferView[i] = binaryAudio.charCodeAt(i);
}
// Convert to 16-bit PCM data.
const pcmData = new Int16Array(audioBuffer);
// Create audio buffer.
const frameCount = pcmData.length;
const audioBufferData = this.audioContext.createBuffer(
this.channels,
frameCount,
this.sampleRate,
);
// Get channel data and convert PCM to float32.
const channelData = audioBufferData.getChannelData(0);
for (let i = 0; i < frameCount; i++) {
// Convert 16-bit PCM (-32768 to 32767) to float32 (-1.0 to 1.0)
channelData[i] = pcmData[i] / 32768.0;
}
// Create and play the source.
const source = this.audioContext.createBufferSource();
source.buffer = audioBufferData;
source.connect(this.audioContext.destination);
source.start();
return source;
}
render() {
if (this.enabled) {
return html`<span><slot></slot></span>`;
}
return html`<span @click="${this.playAudio}"><slot></slot></span>`;
}
}
customElements.define('audio-player', AudioPlayer);
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