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@yidun/audio-amr

v1.1.0

Published

amr 音频录制与播放(微信语音所用的格式)

Downloads

3

Readme

AMR 录音机

(README in English)

纯前端解码、播放、录音、编码 AMR 音频,无须服务器支持,基于 amr.jsRecorderJs

注意:由于使用了 amr.js 做编码和解码,因此 js 文件(压缩后,未 gzip)接近 500 KB,使用前请考虑。

特性

  • 方便的 API 实现解码、播放、录音、编码 AMR 文件。
  • 支持 url 和 blob (即<input type="file">)方式获取 AMR。
  • 支持将浏览器 <audio> 所支持的音频格式(例如 MP3 或 OGG 音频)转换成 AMR 音频。
  • 编码后的 AMR 文件可下载,无须服务器。

Demo

demo.html

安装

方法一:引入 js 文件

<script type="text/javascript" src="./BenzAMRRecorder.min.js"></script>

方法二:使用 npm

npm install benz-amr-recorder
var BenzAMRRecorder = require('benz-amr-recorder');

用法

播放 AMR:

var amr = new BenzAMRRecorder();
amr.initWithUrl('path/to/voice.amr').then(function() {
  amr.play();
});
amr.onEnded(function() {
  alert('播放完毕');
})

播放本地文件:

<input type="file" id="amr-file" accept=".amr">
var amr = new BenzAMRRecorder();
var amrFileObj = document.getElementById('amr-file');
amrFileObj.onchange = function() {
  amr.initWithBlob(this.files[0]).then(function() {
    amr.play();
  });
}

录制 AMR:

var amrRec = new BenzAMRRecorder();
amrRec.initWithRecord().then(function() {
  amrRec.startRecord();
});

下载 AMR:

window.location.href = window.URL.createObjectURL(amr.getBlob());

把 MP3 转换成 AMR (需要浏览器原生支持 MP3):

var amrFromMp3 = new BenzAMRRecorder();
amrFromMp3.initWithUrl('path/to/file.mp3').then(function() {
  // 下载 amr 文件
  window.location.href = window.URL.createObjectURL(amrFromMp3.getBlob());
})

API

初始化对象

/**
 * 是否已经初始化
 * @return {boolean}
 */
amr.isInit();
/**
 * 使用浮点数据初始化
 * @param {Float32Array} array
 * @return {Promise}
 */
amr.initWithArrayBuffer(array);
/**
 * 使用 Blob 对象初始化( <input type="file">)
 * @param {Blob} blob
 * @return {Promise}
 */
amr.initWithBlob(blob);
/**
 * 使用 url 初始化
 * @param {string} url
 * @return {Promise}
 */
amr.initWithUrl(url);
/**
 * 初始化录音
 * @return {Promise}
 */
amr.initWithRecord();

事件

注意:事件不会叠加,也就是说,新注册的事件将覆盖掉旧的事件。

/**
 * 播放
 * @param {Function} fn
 */
amr.onPlay(function() {
  console.log('开始播放');
});
/**
 * 停止(包括播放结束)
 * @param {Function} fn
 */
amr.onStop(function() {
  console.log('停止播放');
});
/**
 * 播放结束
 * @param {Function} fn
 */
amr.onEnded(function() {
  console.log('播放结束');
});
/**
 * 开始录音
 * @param {Function} fn
 */
amr.onStartRecord(function() {
  console.log('开始录音');
});
/**
 * 结束录音
 * @param {Function} fn
 */
amr.onFinishRecord(function() {
  console.log('结束录音');
});

播放控制

/**
 * 播放
 */
amr.play();
/**
 * 停止
 */
amr.stop();
/**
 * 是否正在播放
 * @return {boolean}
 */
amr.isPlaying();
/**
 * 指定点播放
 * @return {boolean}
 */
amr.seek(val);
/**
 * 得到当前播放时间点
 * @return {Number}
 */
amr.getCurrentTime();

录音控制

/**
 * 开始录音
 */
amr.startRecord();
/**
 * 结束录音,并把录制的音频转换成 AMR
 * @return {Promise}
 */
amr.finishRecord();
/**
 * 放弃录音
 */
amr.cancelRecord();
/**
 * 是否正在录音
 * @return {boolean}
 */
amr.isRecording();

其他

/**
 * 获取音频的时间长度(单位:秒)
 * @return {Number}
 */
amr.getDuration();
/**
 * 获取 AMR 文件的 Blob 对象(用于下载文件)
 * @return {Blob}
 */
amr.getBlob();

尚未完成的特性

  • [x] ~~使用 Worker 编码解码 AMR。~~
  • [ ] 暂停功能。
  • [ ] 播放进度控制。

许可

MIT.