Stream Audio To Dictation Session

// Browser example: same IDs as Python tab; add <input type="file" id="audioFile" /> in your HTML.

const transcriptionSessionId = '<transcription_session_id>';
const sdpSukiToken = '<sdp_suki_token>';

// Staging WebSocket URL
const ws = new WebSocket('wss://sdp.suki-stage.com/ws/transcribe', [
  `SukiAmbientAuth,${sdpSukiToken},${transcriptionSessionId}`,
]);

function uint8ToBase64(bytes: Uint8Array): string {
  let binary = '';
  for (let i = 0; i < bytes.byteLength; i += 1) {
    binary += String.fromCharCode(bytes[i]!);
  }
  return btoa(binary);
}

ws.onopen = () => {
  const input = document.getElementById('audioFile') as HTMLInputElement | null;
  const file = input?.files?.[0];
  if (!file) {
    console.error('Select a file for #audioFile');
    ws.close();
    return;
  }
  const reader = new FileReader();
  reader.onload = () => {
    const buffer = reader.result as ArrayBuffer;
    const wavHeaderBytes = 44; // Set to 0 if the file is already raw PCM.
    const pcm = new Uint8Array(buffer, wavHeaderBytes);
    const chunkSize = 3200;
    for (let offset = 0; offset < pcm.byteLength; offset += chunkSize) {
      const end = Math.min(offset + chunkSize, pcm.byteLength);
      const chunk = pcm.subarray(offset, end);
      ws.send(
        JSON.stringify({
          type: 'AUDIO',
          audioData: uint8ToBase64(chunk),
        }),
      );
    }
    ws.send(JSON.stringify({ type: 'EVENT', event: 'AUDIO_END' }));
  };
  reader.readAsArrayBuffer(file);
};

ws.onmessage = (event) => {
  const payload = JSON.parse(event.data as string);
  if (payload.transcript?.transcript === 'EOF') {
    console.log('End of transcription stream');
    return;
  }
  console.log('Partial:', !payload.is_final, payload.transcript?.transcript);
};