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import { isSafariBrowser } from "@/lib/browser";
type RecorderState = {
stream: MediaStream | null;
recording: boolean;
paused: boolean;
error: string | null;
mimeType: string | null;
audioOnly: boolean;
};
type Options = {
videoDeviceId?: string;
audioDeviceId?: string;
preferAudioOnly?: boolean;
onChunk: (chunk: Blob) => void;
};
export const useMediaRecorder = ({ videoDeviceId, audioDeviceId, preferAudioOnly = false, onChunk }: Options) => {
const recorderRef = useRef<MediaRecorder | null>(null);
const streamRef = useRef<MediaStream | null>(null);
const startStreamPromiseRef = useRef<Promise<MediaStream> | null>(null);
const chunkBufferRef = useRef<Blob[]>([]);
const stopResolveRef = useRef<((chunks: Blob[]) => void) | null>(null);
const stopTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const stopFinalizeTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const [state, setState] = useState<RecorderState>({
stream: null,
recording: false,
paused: false,
error: null,
mimeType: null,
audioOnly: preferAudioOnly,
});
const resetStream = useCallback(() => {
streamRef.current?.getTracks().forEach((track) => track.stop());
streamRef.current = null;
startStreamPromiseRef.current = null;
setState((prev) => ({ ...prev, stream: null }));
}, []);
const startStream = useCallback(async () => {
if (streamRef.current) {
return streamRef.current;
}
if (startStreamPromiseRef.current) {
return startStreamPromiseRef.current;
}
startStreamPromiseRef.current = (async () => {
try {
if (!navigator.mediaDevices?.getUserMedia) {
throw new Error("Media devices API not available in this browser context.");
}
if (preferAudioOnly) {
const audioStream = await navigator.mediaDevices.getUserMedia({
video: false,
audio: audioDeviceId ? { deviceId: { exact: audioDeviceId } } : true,
});
streamRef.current = audioStream;
setState((prev) => ({ ...prev, stream: audioStream, error: null, audioOnly: true }));
return audioStream;
}
const constraints = {
video: videoDeviceId
? { deviceId: { exact: videoDeviceId } }
: { facingMode: "user", width: { ideal: 1280 }, height: { ideal: 720 } },
audio: audioDeviceId ? { deviceId: { exact: audioDeviceId } } : true,
};
try {
let stream = await navigator.mediaDevices.getUserMedia(constraints);
if (!stream.getVideoTracks().length && constraints.video) {
stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: false });
}
streamRef.current = stream;
setState((prev) => ({ ...prev, stream, error: null, audioOnly: false }));
return stream;
} catch (error) {
try {
const stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
streamRef.current = stream;
setState((prev) => ({
...prev,
stream,
error: "Fell back to default camera & microphone.",
audioOnly: false,
}));
return stream;
} catch (fallbackError) {
try {
const stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: false });
streamRef.current = stream;
setState((prev) => ({
...prev,
stream,
error: "Microphone blocked. Previewing camera video only.",
audioOnly: false,
}));
return stream;
} catch (_videoOnlyError) {
try {
const audioOnlyStream = await navigator.mediaDevices.getUserMedia({ video: false, audio: true });
streamRef.current = audioOnlyStream;
setState((prev) => ({
...prev,
stream: audioOnlyStream,
error: "Camera unavailable — switched automatically to Audio Presenter Mode.",
audioOnly: true,
}));
return audioOnlyStream;
} catch (_audioError) {
const baseError = error instanceof Error ? error : fallbackError;
const message =
baseError instanceof Error
? `${baseError.name}: ${baseError.message}`
: "Camera or microphone permission denied";
setState((prev) => ({ ...prev, error: message }));
throw baseError;
}
}
}
}
} catch (error) {
const message =
error instanceof Error
? `${error.name}: ${error.message}`
: "Camera or microphone permission denied";
setState((prev) => ({ ...prev, error: message }));
throw error;
} finally {
startStreamPromiseRef.current = null;
}
})();
return startStreamPromiseRef.current;
}, [audioDeviceId, preferAudioOnly, videoDeviceId]);
const startRecording = useCallback(async () => {
if (typeof MediaRecorder === "undefined") {
const message = "MediaRecorder not supported in this browser.";
setState((prev) => ({ ...prev, error: message }));
throw new Error(message);
}
const isSafari = isSafariBrowser();
if (streamRef.current && !streamRef.current.active) {
resetStream();
}
const stream = streamRef.current ?? (await startStream());
const hasVideo = stream.getVideoTracks().length > 0;
const preferredTypes = !hasVideo
? isSafari
? ["audio/mp4", "audio/webm;codecs=opus", "audio/webm"]
: ["audio/webm;codecs=opus", "audio/webm", "audio/mp4"]
: isSafari
? ["video/mp4;codecs=avc1,mp4a.40.2", "video/mp4;codecs=h264,aac", "video/mp4"]
: [
"video/webm;codecs=vp9,opus",
"video/webm;codecs=vp8,opus",
"video/webm",
"video/mp4;codecs=h264,aac",
"video/mp4",
];
const supportedType = preferredTypes.find((type) => MediaRecorder.isTypeSupported(type));
const recorder = supportedType ? new MediaRecorder(stream, { mimeType: supportedType }) : new MediaRecorder(stream);
const shouldUseMp4 = Boolean(isSafari || supportedType?.includes("mp4"));
const fallbackMimeType = !hasVideo
? shouldUseMp4
? "audio/mp4"
: "audio/webm"
: shouldUseMp4
? "video/mp4"
: "video/webm";
const initialMimeType = recorder.mimeType || supportedType || fallbackMimeType;
chunkBufferRef.current = [];
recorderRef.current = recorder;
recorder.ondataavailable = (event) => {
if (event.data.size > 0) {
chunkBufferRef.current.push(event.data);
onChunk(event.data);
}
if (event.data.type) {
setState((prev) => (prev.mimeType === event.data.type ? prev : { ...prev, mimeType: event.data.type }));
}
if (recorder.state === "inactive" && stopResolveRef.current) {
if (stopFinalizeTimeoutRef.current) {
clearTimeout(stopFinalizeTimeoutRef.current);
}
stopFinalizeTimeoutRef.current = setTimeout(() => {
stopFinalizeTimeoutRef.current = null;
stopResolveRef.current?.([...chunkBufferRef.current]);
stopResolveRef.current = null;
}, 400);
}
};
recorder.onpause = () => {
setState((prev) => ({ ...prev, paused: true }));
};
recorder.onresume = () => {
setState((prev) => ({ ...prev, paused: false }));
};
recorder.onerror = (event) => {
const nextError =
event.error?.message || "Recording failed before any media chunk was produced.";
setState((prev) => ({ ...prev, error: nextError, recording: false, paused: false }));
};
recorder.onstop = () => {
if (stopTimeoutRef.current) {
clearTimeout(stopTimeoutRef.current);
stopTimeoutRef.current = null;
}
if (stopResolveRef.current) {
if (stopFinalizeTimeoutRef.current) {
clearTimeout(stopFinalizeTimeoutRef.current);
}
stopFinalizeTimeoutRef.current = setTimeout(() => {
stopFinalizeTimeoutRef.current = null;
stopResolveRef.current?.([...chunkBufferRef.current]);
stopResolveRef.current = null;
}, 400);
}
setState((prev) => ({ ...prev, recording: false, paused: false }));
};
try {
recorder.start(shouldUseMp4 ? 1000 : 2000);
} catch (_error) {
recorder.start();
}
setState((prev) => ({
...prev,
recording: true,
paused: false,
audioOnly: !hasVideo,
mimeType: initialMimeType || prev.mimeType,
}));
}, [onChunk, resetStream, startStream]);
const pauseRecording = useCallback(() => {
const recorder = recorderRef.current;
if (!recorder) return false;
if (typeof recorder.pause !== "function") {
setState((prev) => ({ ...prev, error: "Pause not supported in this browser." }));
return false;
}
if (recorder.state !== "recording") {
return false;
}
try {
recorder.pause();
return true;
} catch (error) {
const message =
error instanceof Error ? `${error.name}: ${error.message}` : "Pause failed.";
setState((prev) => ({ ...prev, error: message }));
return false;
}
}, []);
const resumeRecording = useCallback(() => {
const recorder = recorderRef.current;
if (!recorder) return false;
if (typeof recorder.resume !== "function") {
setState((prev) => ({ ...prev, error: "Resume not supported in this browser." }));
return false;
}
if (recorder.state !== "paused") {
return false;
}
try {
recorder.resume();
return true;
} catch (error) {
const message =
error instanceof Error ? `${error.name}: ${error.message}` : "Resume failed.";
setState((prev) => ({ ...prev, error: message }));
return false;
}
}, []);
const stopRecording = useCallback(() => {
const recorder = recorderRef.current;
if (!recorder || recorder.state === "inactive") {
return Promise.resolve([...chunkBufferRef.current]);
}
if (stopTimeoutRef.current) {
clearTimeout(stopTimeoutRef.current);
stopTimeoutRef.current = null;
}
if (stopFinalizeTimeoutRef.current) {
clearTimeout(stopFinalizeTimeoutRef.current);
stopFinalizeTimeoutRef.current = null;
}
return new Promise<Blob[]>((resolve) => {
stopResolveRef.current = resolve;
stopTimeoutRef.current = setTimeout(() => {
stopTimeoutRef.current = null;
if (stopFinalizeTimeoutRef.current) {
clearTimeout(stopFinalizeTimeoutRef.current);
stopFinalizeTimeoutRef.current = null;
}
stopResolveRef.current?.([...chunkBufferRef.current]);
stopResolveRef.current = null;
}, isSafariBrowser() ? 5000 : 2500);
try {
if (!isSafariBrowser() && typeof recorder.requestData === "function" && recorder.state === "recording") {
recorder.requestData();
}
recorder.stop();
} catch (error) {
if (stopTimeoutRef.current) {
clearTimeout(stopTimeoutRef.current);
stopTimeoutRef.current = null;
}
stopResolveRef.current?.([...chunkBufferRef.current]);
stopResolveRef.current = null;
throw error;
}
setState((prev) => ({ ...prev, recording: false, paused: false }));
});
}, []);
const stopTracks = useCallback(() => {
if (stopTimeoutRef.current) {
clearTimeout(stopTimeoutRef.current);
stopTimeoutRef.current = null;
}
if (stopFinalizeTimeoutRef.current) {
clearTimeout(stopFinalizeTimeoutRef.current);
stopFinalizeTimeoutRef.current = null;
}
stopResolveRef.current = null;
recorderRef.current = null;
resetStream();
}, [resetStream]);
const stopStream = useCallback(() => {
stopTracks();
setState((prev) => ({ ...prev, stream: null }));
}, [stopTracks]);
useEffect(() => () => stopTracks(), [stopTracks]);
return {
...state,
startStream,
startRecording,
pauseRecording,
resumeRecording,
stopRecording,
stopStream,
};
};
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