NodeJS將Int16Array二進制緩沖區轉換為針對Google Speech API的LINEAR16編碼的原始流

Question

我正在嘗試在使用AudioContext在瀏覽器中進行語音記錄的節點服務器中將語音轉換為文本。 我能夠通過binaryType：arraybuffer的WebSocket連接將int16Array緩沖區（記錄的數據）發送到我的節點服務器。

this.processor.onaudioprocess = (e) => {
    // this.processAudio(e)
    for (
        var float32Array = e.inputBuffer.getChannelData(0) || new Float32Array(this.bufferSize),
        len = float32Array.length,
        int16Array = new Int16Array(len);
        len--;)
        int16Array[len] = 32767 * Math.min(1, float32Array[len]);
    this.socket.send(int16Array.buffer);
};

在服務器中，數據接收為

<Buffer 66 6f 6f ...>

現在，我想解析或轉換為可讀流，以便可以通過管道傳輸到Google語音RecognitionStream。

  function processAudioBuffer(int16ArrayBuffer) {
    console.log("Received stream :", int16ArrayBuffer, typeof 
    recognizeStreams[userId]);
    const recognizer = getGoogleSpeechStreamRecognizer();

    if (recognizer) {

    /* HERE I NEED SOMETHING WHICH MAKES MY BUFFER COMPATIBLE WITH GOOGLE SPEECH API */

    // tried with streamifier but no luck
    // streamifier.createReadStream(int16ArrayBuffer).pipe(recognizer);

    // also tried with Record which is used in google-cloud-node-samples to record stream from connected mic device, but no luck
    var file = new Record({
       path: `${userId}.raw`,
       encoding: 'arraybuffer',
       contents: int16ArrayBuffer
    });
    file.pipe(recognizer);

    } else {
         console.log('user stream is not yet created');
    }
 }

識別器拋出以下錯誤：

Error: write after end
at writeAfterEnd (/Users/demo/node_modules/duplexify/node_modules/readable-stream/lib/_stream_writable.js:222:12)
at Writable.write (/Users/demo/node_modules/duplexify/node_modules/readable-stream/lib/_stream_writable.js:262:20)
at Duplexify.end (/Users/demo/node_modules/duplexify/index.js:223:18)
at Record.pipe (/Users/demo/node_modules/record/index.js:70:14)
at processAudioBuffer (/Users/demo/app.js:87:10)
at WebSocket.incoming (/Users/demo/app.js:104:7)
at emitTwo (events.js:106:13)
at WebSocket.emit (events.js:191:7)
at Receiver._receiver.onmessage (/Users/demo/node_modules/ws/lib/WebSocket.js:146:54)
at Receiver.dataMessage (/Users/demo/node_modules/ws/lib/Receiver.js:380:14)

Answer 1

解決了！ 我們可以將緩沖區直接寫到從GoogleSpeech創建的識別器流，如下所示：

const recognizer = getGoogleSpeechStreamRecognizer();

recognizer.write(int16ArrayBuffer)