相关疑难解决方法(0)

在Java中开始录制操作时,如何检测静音？什么是PCM数据？如何在Java中计算PCM数据？

我找到了解决方案:

package bemukan.voiceRecognition.speechToText;

import javax.sound.sampled.*;
import java.io.*;

public class RecordAudio {
    private File audioFile;
    protected boolean running;
    private ByteArrayOutputStream out;
    private AudioInputStream inputStream;
    final static float MAX_8_BITS_SIGNED = Byte.MAX_VALUE;
    final static float MAX_8_BITS_UNSIGNED = 0xff;
    final static float MAX_16_BITS_SIGNED = Short.MAX_VALUE;
    final static float MAX_16_BITS_UNSIGNED = 0xffff;
    private AudioFormat format;
    private float level;
    private int frameSize;

    public RecordAudio(){
         getFormat();
    }

    private AudioFormat getFormat() {
        File file = new File("src/Facebook/1.wav");
        AudioInputStream stream;
        try {
            stream = AudioSystem.getAudioInputStream(file);
            format=stream.getFormat();
            frameSize=stream.getFormat().getFrameSize();
            return …

我正在使用带有NodeJS后端的Google Cloud API for Speech-to-text.应用程序需要能够侦听语音命令,并将它们作为缓冲区传输到后端.为此,我需要在检测到静音时发送前一个音频的缓冲区.

任何帮助,将不胜感激.包括下面的js代码

 if (!navigator.getUserMedia)
    navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia ||
        navigator.mozGetUserMedia || navigator.msGetUserMedia;

if (navigator.getUserMedia) {
    navigator.getUserMedia({audio: true}, success, function (e) {
        alert('Error capturing audio.');
    });
} else alert('getUserMedia not supported in this browser.');

var recording = false;

window.startRecording = function () {
    recording = true;
};

window.stopRecording = function () {
    recording = false;
    // window.Stream.end();
};

function success(e) {
    audioContext = window.AudioContext || window.webkitAudioContext;
    context = new audioContext();

    // the sample rate is in …

我有一个使用MediaRecorderapi 创建的音频文件/ blob :

let recorder = new MediaRecorder(this.stream)
let data = [];
recorder.ondataavailable = event => data.push(event.data);

然后在录制结束时:

let superBlob = new Blob(data, { type: "video/webm" });

如何使用此blob创建AudioBuffer？我需要:

• 将Blob对象转换为ArrayBuffer我可以使用的对象AudioContext.decodeAudioData(返回一个AudioBuffer)或
• 将Blob对象转换为a Float32Array,我可以将其复制到AudioBufferwith中AudioBuffer.copyToChannel()

任何关于如何实现这一点的提示都表示赞赏.干杯!