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/**
* 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.
*/
import { useCallback, useEffect, useMemo, useRef, useState } from "react";
import {
MultimodalLiveAPIClientConnection,
MultimodalLiveClient,
} from "../lib/multimodal-live-client";
import { LiveConfig } from "../multimodal-live-types";
import { AudioStreamer } from "../lib/audio-streamer";
import { audioContext } from "../lib/utils";
import VolMeterWorket from "../lib/worklets/vol-meter";
export type UseLiveAPIResults = {
client: MultimodalLiveClient;
setConfig: (config: LiveConfig) => void;
config: LiveConfig;
connected: boolean;
connect: () => Promise<void>;
disconnect: () => Promise<void>;
volume: number;
};
export function useLiveAPI({
url,
apiKey,
}: MultimodalLiveAPIClientConnection): UseLiveAPIResults {
const client = useMemo(
() => new MultimodalLiveClient({ url, apiKey }),
[url, apiKey],
);
const audioStreamerRef = useRef<AudioStreamer | null>(null);
const [connected, setConnected] = useState(false);
const [config, setConfig] = useState<LiveConfig>({
model: "models/gemini-2.0-flash-live-001",
systemInstruction: {
parts: [
{ text: "Please respond in English." }
]
},
generationConfig: {
responseModalities: "audio",
speechConfig: {
voiceConfig: {
prebuiltVoiceConfig: {
voiceName: "Charon"
}
}
}
}
});
const [volume, setVolume] = useState(0);
// register audio for streaming server -> speakers
useEffect(() => {
if (!audioStreamerRef.current) {
audioContext({ id: "audio-out" }).then((audioCtx: AudioContext) => {
audioStreamerRef.current = new AudioStreamer(audioCtx);
audioStreamerRef.current
.addWorklet<any>("vumeter-out", VolMeterWorket, (ev: any) => {
setVolume(ev.data.volume);
})
.then(() => {
// Successfully added worklet
});
});
}
}, [audioStreamerRef]);
useEffect(() => {
const onClose = () => {
setConnected(false);
};
const stopAudioStreamer = () => audioStreamerRef.current?.stop();
const onAudio = (data: ArrayBuffer) =>
audioStreamerRef.current?.addPCM16(new Uint8Array(data));
client
.on("close", onClose)
.on("interrupted", stopAudioStreamer)
.on("audio", onAudio);
return () => {
client
.off("close", onClose)
.off("interrupted", stopAudioStreamer)
.off("audio", onAudio);
};
}, [client]);
const connect = useCallback(async () => {
console.log(config);
if (!config) {
throw new Error("config has not been set");
}
client.disconnect();
await client.connect(config);
setConnected(true);
}, [client, setConnected, config]);
const disconnect = useCallback(async () => {
client.disconnect();
setConnected(false);
}, [setConnected, client]);
return {
client,
config,
setConfig,
connected,
connect,
disconnect,
volume,
};
}
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