wavesurfer.js绘制音频波形图的实现

1.查看效果图

向前选中：

向后选中：

代码如下（示例）：

<template>
 <div class="waveSurfer">
  <div class="top">
   <span @click="leftSelect">向前选中</span>
   <span @click="rightSelect">向后选中</span>
   <span @click="Region">标注</span>
  </div>
  <!-- 时间轴 -->
  <div id="wave-timeline" />
  <!-- 频谱图 -->
  <div id="waveform">
   <progress
    id="progress"
    class="progress progress-striped"
    value="0"
    max="100"
   ></progress>
  </div>
  <div v-show="ppt" id="wave-spectrogram" class="mt-20" />
  <!-- 控制按钮 -->
  <div class="title">
   <ul>
    <li>
     <span @click="zoomIn"></span>
    </li>
    <li>
     <span @click="rew"></span>
    </li>
    <li>
     <span :class="{ on: isPlay }" @click="plays"></span>
    </li>
    <li>
     <span @click="speek"></span>
    </li>
    <li>
     <span @click="zoomOut"></span>
    </li>
    <li>
     <span @click="replay"></span>
    </li>
    <li @click="toggleMute" :class="{ on: toggleMutebutton }" class="sound">
     <span></span>
    </li>
    <li>
     <input
      @mouseup="volumeBarHandle"
      v-model="volValue"
      type="range"
      min="0"
      max="1"
      value="0.8"
      step="0.01"
     />
    </li>
    <li @click="DoubleSpeed(index)">
     {{ speed[index] + " X" }}
    </li>
   </ul>
  </div>
 </div>
</template>
<script>
import WaveSurfer from "wavesurfer.js";
import Timeline from "wavesurfer.js/dist/plugin/wavesurfer.timeline.js";
import Regions from "wavesurfer.js/dist/plugin/wavesurfer.regions.js";
export default {
 data: function () {
  return {
   index: 0,
   speed: [1.0, 1.5, 2.0, 0.5],
   isPlay: false,
   ppt: false,
   ds: 1.0,
   zoomValue: 100,
   zoomMin: 100,
   fast: 3,
   back: 3,
   noteData: [],
   toggleMutebutton: true,
   volValue: 0,
   audioUrl: "",
   loading: true,
  };
 },
 // computed: {
 //  // 计算属性的 getter
 //  getUrl: function() {
 //   // `this` 指向 vm 实例
 //   return this.$store.state.voicetrain.url
 //  }
 // },
 // watch: {
 //  getUrl(newUrl) {
 //   this.loading = true
 //   this.audioUrl = newUrl
 //   document.getElementById('waveform').innerHTML = ''
 //   this.init()
 //  }
 // },
 mounted() {
  this.audioUrl =
   "http://192.168.1.101:8080/api/files/20201104/62afa213458d44b0a99440b33fb694b9";
  this.init();
 },

 methods: {
  // 初始化
  init() {
   document.getElementById("progress").style.display = "block";
   this.$nextTick(() => {
    this.wavesurfer = WaveSurfer.create({
     container: "#waveform",
     cursorColor: "#DB7093", // 声波播放进度线color
     audioRate: 1,
     scrollParent: true,
     backend: "WebAudio",
     barHeight: 1.5,
     waveColor: "#43d996", // 声波color
     progressColor: "#43d996", // 已播放声波color
     loaderColor: "#8B0000",
     hideScrollbar: false,
     autoCenter: true,
     height: 120,
     splitChannels: true,
     responsive: true,
     minPxPerSec: 1,
     plugins: [
      Timeline.create({
       container: "#wave-timeline",
       fontSize: 14,
       primaryFontColor: "#9191a5",
       secondaryFontColor: "#9191a5",
       primaryColor: "#9191a5",
       secondaryColor: "#9191a5",
      }),
      Regions.create({}),
     ],
    });
    this.wavesurfer.addRegion({
     loop: false,
     drag: false,
     resize: false,
     color: "rgba(254, 255, 255, 0.4)",
    });
    // 加载进度条
    this.wavesurfer.on("loading", function (percents) {
     document.getElementById("progress").value = percents;
    });
    this.wavesurfer.load(this.audioUrl);
    this.value = this.wavesurfer.getVolume() * 100; // 获取音量
    this.zoomValue = this.wavesurfer.params.minPxPerSec;
    this.zoomMin = this.wavesurfer.params.minPxPerSec;
    this.wavesurfer.zoom(Number(this.zoomValue));
    this.wavesurfer.panner = this.wavesurfer.backend.ac.createPanner();
    this.wavesurfer.backend.setFilter(this.wavesurfer.panner);
    let _this = this;
    _this.wavesurfer.on("ready", function () {
     _this.wavesurfer.enableDragSelection({
      color: "rgba(0, 180, 0, 0.3)",
     });
     _this.wavesurfer.clearRegions();
     _this.wavesurfer.zoom(_this.zoomValue);
     // 音频加载完成
     document.getElementById("progress").style.display = "none";
     document.getElementById("progress").value = 0;
     _this.isPlay = true;
     _this.wavesurfer.play(0);
    });
    document.getElementById("waveform").onclick = function () {
     _this.isPlay = false;
     _this.wavesurfer.clearRegions();
    };
    // 更新区域时。回调将接收该Region对象。
    // this.wavesurfer.on("region-updated", function (region) {
    //  region.playLoop(); // 循环播放选中区域
    //  _this.isPlay = true;
    // });
    _this.wavesurfer.on("region-created", _this.addRegion);
    _this.wavesurfer.on("region-click", _this.editAnnotation);

    _this.wavesurfer.on("finish", function () {
     _this.wavesurfer.play(0);
    });
   });
  },
  addRegion(params) {
   this.wavesurfer.clearRegions();
   params.handleLeftEl.style.backgroundColor = "transparent";
   params.handleRightEl.style.backgroundColor = "transparent";
  },
  toggleMute() {
   if (this.toggleMutebutton) {
    this.volumeCached = this.wavesurfer.getVolume();
    this.wavesurfer.setVolume(0);
    this.toggleMutebutton = false;
    this.volValue = 0;
   } else {
    if (this.volumeCached == 0) this.volumeCached = 1;
    this.wavesurfer.setVolume(this.volumeCached);
    this.toggleMutebutton = true;
    this.volValue = this.volumeCached;
   }
  },
  volumeBarHandle(e) {
   if (e.offsetX >= 0 && e.offsetX <= 80) {
    this.toggleMutebutton = true;
    this.wavesurfer.setVolume(e.offsetX / 80);
   } else if (e.offsetX < 0) {
    this.toggleMutebutton = false;
    this.wavesurfer.setVolume(0);
   } else {
    this.wavesurfer.setVolume(1);
    this.toggleMutebutton = true;
   }
  },
  // 标注
  Region() {
   console.log(
    Object.getOwnPropertyNames(this.wavesurfer.regions.list).length
   );
   if (
    Object.getOwnPropertyNames(this.wavesurfer.regions.list).length == 0
   ) {
    alert("请选择波纹");
    return;
   }
   let start = 0,
    end = 0;
   for (var k in this.wavesurfer.regions.list) {
    let obj = this.wavesurfer.regions.list[k];
    start = obj.start.toFixed(2) * 1000;
    end = obj.end.toFixed(2) * 1000;
   }
   console.log(this.wavesurfer);
   console.log("开始", start);
   console.log("结束", end);
  },
  // 播放
  plays() {
   this.isPlay = !this.isPlay;
   this.wavesurfer.playPause(); //切换播放，应用播放或暂停
  },
  // 回退
  rew() {
   this.wavesurfer.skip(-this.back);
   this.goPlay();
  },
  // 快进
  speek() {
   this.wavesurfer.skip(this.fast);
   this.goPlay();
  },
  // 重载
  replay() {
   this.isPlay = true;
   this.wavesurfer.stop();
   this.wavesurfer.clearRegions();
   this.wavesurfer.play(0);
  },
  // 倍速
  DoubleSpeed(index) {
   if (index === 3) {
    this.index = 0;
    this.wavesurfer.setPlaybackRate(this.speed[this.index]);
   } else {
    this.index = index + 1;
    this.wavesurfer.setPlaybackRate(this.speed[this.index]);
   }
   console.log(this.wavesurfer);
  },
  // 缩放百分比显示格式
  formatZoom(val) {
   return val + 100 + " 像素 / 秒";
  },
  // 点击缩小
  zoomIn() {
   if (this.zoomValue >= 100) {
    return;
   }
   this.zoomValue += 1;
   this.wavesurfer.zoom(this.zoomValue);
  },
  // 点击扩大
  zoomOut() {
   if (this.zoomValue < -100) {
    return;
   }
   this.zoomValue -= 1;
   this.wavesurfer.zoom(this.zoomValue);
  },
  // 缩放监听
  zoomChange() {
   this.wavesurfer.zoom(Number(this.zoomValue));
  },
  goPlay() {
   let start = this.wavesurfer.getCurrentTime();
   this.wavesurfer.play(start);
  },
  // 向前选中
  leftSelect() {
   let end = this.wavesurfer.getCurrentTime(); // 获取当前播放位置
   this.waveRegion(this.wavesurfer, 0, end, "rgba(0,180,0,.3)", true);
  },
  // 向后选中
  rightSelect() {
   let start = this.wavesurfer.getCurrentTime(); // 获取当前播放位置
   let end = this.wavesurfer.getDuration(); // 获取音频片段的持续时间
   this.waveRegion(this.wavesurfer, start, end, "rgba(0,180,0,.3)", true);
  },
  waveRegion(wavesurfer, start, end, color, clear) {
   if (!clear) {
    wavesurfer.clearRegions();
   }
   wavesurfer.addRegion({
    start: start,
    end: end,
    color: color,
    drag: false,
   });
  },
  // 区域点击事件新建
  saveRegions() {
   console.log("声纹点击---");
   this.noteData = [];
   const _this = this;
   this.noteData = Object.keys(_this.wavesurfer.regions.list).map(function (
    id
   ) {
    const region = _this.wavesurfer.regions.list[id];
    return {
     id: id,
     edit: false,
     start: Math.round(region.start * 10) / 10,
     end: Math.round(region.end * 10) / 10,
     attributes: region.attributes,
     data: { note: region.data.note || "" },
    };
   });
  },
  // 区域点击
  editAnnotation() {
   this.isPlay = false;
  },
  showNote(region) {
   if (!this.showNote.el) {
    this.showNote.el = document.querySelector("#subtitle");
   }
   this.showNote.el.textContent = region.data.note || "–";
  },
  // 设置音量
  setVolume(val) {
   console.log(val);
   this.wavesurfer.setVolume(val / 100);
  },
  // 实例点击
  clearReagion() {
   this.wavesurfer.clearRegions();
  },
 },
};
</script>
<style lang="scss" scoped>
#waveform {
 position: relative;
}
.top {
 width: 100%;
 flex-basis: 70px;
 line-height: 40px;
 flex-shrink: 0;
 color: white;
 text-indent: 15px;
 span,
 el-slider {
  color: rgb(39, 39, 39);
  font-size: 13px;
  font-weight: 700;
  margin-right: 20px;
  padding: 4px 10px;
  border: 1px solid #ccc;
  border-radius: 10px;
 }
}
.title {
 width: 100%;
 flex-basis: 70px;
 line-height: 40px;
 text-align: left;
 flex-shrink: 0;
 color: white;
 text-indent: 15px;
 ul {
  list-style-type: none;
  padding-inline-start: 0;
  .speed {
   display: flex;
   flex-direction: column;
  }
  li {
   position: relative;
   display: inline-block;
   cursor: default;
   &:hover {
   }
   &:active {
   }
   span {
    display: inline-block;
    width: 30px;
    height: 30px;
    line-height: 30px;
   }
   &:nth-child(1) span {
    width: 27px;
    height: 27px;
    background: url("img/缩小.png") right;
    background-size: cover;
   }
   &:nth-child(2) span {
    background: url("img/kuaitui_bg.png") right;
    background-size: cover;
   }
   &:nth-child(3) {
    span {
     background: url("img/bofang_bg.png") right;
     background-size: cover;
    }
    .on {
     background: url("img/zanting_bg.png") right;
     background-size: cover;
    }
   }
   &:nth-child(4) span {
    background: url("img/kuaijin_bg.png") right;
    background-size: cover;
   }
   &:nth-child(5) span {
    background: url("img/缩放.png") right;
    background-size: cover;
   }
   &:nth-child(6) span {
    background: url("img/zhongbo.png") right;
    background-size: cover;
   }
   &:nth-child(9) {
    color: rgb(39, 39, 39);
    font-size: 13px;
    font-weight: 700;
   }
   &:nth-child(7) {
    background: none;
    span {
     width: 25px;
     height: 25px;
     background: url("img/静音.png") no-repeat;
     background-size: cover;
    }
    &.on {
     span {
      width: 25px;
      height: 25px;
      background: url("img/喇叭.png") no-repeat;
      background-size: cover;
     }
    }
   }
   &:nth-child(8) {
    width: 80px;
    background: none;
    input {
     -webkit-appearance: none;
     -moz-appearance: none;
     -ms-appearance: none;
     width: 80px;
     height: 3px;
     background-color: #bbbbbb;
     position: absolute;
     left: 0;
     top: -14px;

     &::-webkit-slider-thumb {
      -webkit-appearance: none;
     }
     &::-moz-range-trackpseduo {
      -moz-appearance: none;
     }
     &::-ms-track {
      width: 100%;
      cursor: pointer;
      background: transparent; /* Hides the slider so custom styles can be added */
      border-color: transparent;
      color: transparent;
     }
     &:focus {
      outline: none;
     }
     &::-webkit-slider-thumb {
      -webkit-appearance: none;
      height: 9px;
      width: 9px;
      margin-top: -1px;
      background: #bbb;
      border-radius: 50%;
      border: solid 0.125em rgba(205, 224, 230, 0.5);
     }
     &::-moz-range-thumb {
      -moz-appearance: none;
      height: 6px;
      width: 6px;
      margin-top: -1px;
      background: #bbb;
      border-radius: 50%;
      border: solid 0.125em rgba(205, 224, 230, 0.5);
     }
     &::-ms-track {
      -moz-appearance: none;
      height: 6px;
      width: 6px;
      margin-top: -1px;
      background: #bbb;
      border-radius: 50%;
      border: solid 0.125em rgba(205, 224, 230, 0.5);
     }
    }
   }
  }
 }
}
#wave-timeline {
 height: 21px;
}
#waveform {
 width: 100%;
 flex-basis: 128px;
 flex-shrink: 0;
 position: relative;
}
#progress {
 position: absolute;
 width: 100%;
 height: 4px;
 background: #ccc;
 top: 48%;
 opacity: 0.7;
 z-index: 44;
}
.mt-20 {
 margin-top: 20px;
}
.mt-30 {
 margin-top: 30px;
}
.waveSurfer {
 width: 470px;
}
.waveSurfer >>> .el-slider__runway {
 margin: 6px 0;
}
</style>

链接：https://wavesurfer-js.org

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