| 4 | * Hook for recording audio and transcribing it via the transcription API. |
| 5 | */ |
| 6 | export function useAudioRecorder() { |
| 7 | const [isRecording, setIsRecording] = useState(false) |
| 8 | const [isTranscribing, setIsTranscribing] = useState(false) |
| 9 | const mediaRecorderRef = useRef<MediaRecorder | null>(null) |
| 10 | const chunksRef = useRef<Blob[]>([]) |
| 11 | |
| 12 | const startRecording = useCallback(async () => { |
| 13 | try { |
| 14 | const stream = await navigator.mediaDevices.getUserMedia({ audio: true }) |
| 15 | const mediaRecorder = new MediaRecorder(stream, { |
| 16 | mimeType: 'audio/webm;codecs=opus', |
| 17 | }) |
| 18 | mediaRecorderRef.current = mediaRecorder |
| 19 | chunksRef.current = [] |
| 20 | |
| 21 | mediaRecorder.ondataavailable = (e) => { |
| 22 | if (e.data.size > 0) { |
| 23 | chunksRef.current.push(e.data) |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | mediaRecorder.start() |
| 28 | setIsRecording(true) |
| 29 | } catch (error) { |
| 30 | console.error('Failed to start recording:', error) |
| 31 | alert('Could not access microphone. Please check permissions.') |
| 32 | } |
| 33 | }, []) |
| 34 | |
| 35 | const stopRecording = useCallback(async (): Promise<string | null> => { |
| 36 | return new Promise((resolve) => { |
| 37 | const mediaRecorder = mediaRecorderRef.current |
| 38 | if (!mediaRecorder) { |
| 39 | resolve(null) |
| 40 | return |
| 41 | } |
| 42 | |
| 43 | mediaRecorder.onstop = async () => { |
| 44 | setIsRecording(false) |
| 45 | setIsTranscribing(true) |
| 46 | |
| 47 | const audioBlob = new Blob(chunksRef.current, { type: 'audio/webm' }) |
| 48 | |
| 49 | // Stop all tracks |
| 50 | mediaRecorder.stream.getTracks().forEach((track) => track.stop()) |
| 51 | |
| 52 | try { |
| 53 | const formData = new FormData() |
| 54 | formData.append( |
| 55 | 'audio', |
| 56 | new File([audioBlob], 'recording.webm', { type: 'audio/webm' }), |
| 57 | ) |
| 58 | formData.append('model', 'whisper-1') |
| 59 | |
| 60 | const response = await fetch('/api/transcription', { |
| 61 | method: 'POST', |
| 62 | body: formData, |
| 63 | }) |