使用amrnb.js (opens new window)播放 amr 格式音频

1. 对 amrnb.js 文件改造 最后一行增加

export { AMR }

2. 引入使用

import { AMR } from 'filepath/amrbg.js'
import axios from 'axios'

// 获取二进制文件解码
const playAudio = (fileUrl) => {
  axios.get(fileUrl, { responseType: 'blob' }).then(({ data: blob }) => {
    var reader = new FileReader()
    reader.onload = function (e) {
      var samples = AMR.decode(new Uint8Array(e.target.result))
      if (!samples) {
        console.log('Failed to decode!')
        return
      }
      playPcm(samples)
    }
    reader.readAsArrayBuffer(blob)
  })
}

// 播放
const playPcm = (samples) => {
  try {
    var ctx = new AudioContext()
  } catch (e) {
    alert('您的浏览器暂不支持播放录音')
    return
  }
  var src = ctx.createBufferSource()
  var buffer = ctx.createBuffer(1, samples.length, 8000)
  if (buffer.copyToChannel) {
    buffer.copyToChannel(samples, 0, 0)
  } else {
    var channelBuffer = buffer.getChannelData(0)
    channelBuffer.set(samples)
  }
  src.buffer = buffer
  src.connect(ctx.destination)
  src.start()
}