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怎么样实现html5声音录制及播放功能?

2018-05-07 19:42:49 来源:www.koalacac.com 【

怎么样实现html5声音录制及播放功能?

html代码:

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>火星黑洞</title>
  </head>
  <body>
    <div>
      <audio autoplay></audio>
      <input onclick="startRecording()" type="button" value="录音" />
      <input onclick="stopRecording()" type="button" value="停止" />
      <input onclick="playRecording()" type="button" value="播放" />
      <input onclick="uploadAudio()" type="button" value="提交" />
      <br />
      <div id="recordingslist"></div>
    </div>
    <script type="text/javascript" src="js/HZRecorder.js"></script>
    <script>
      var recorder;
      var audio = document.querySelector('audio');
      function startRecording() {
        HZRecorder.get(function(rec) {
          recorder = rec;
          recorder.start();
        }, {
          sampleBits: 16,
          sampleRate: 16000
        });
      }
      function stopRecording() {
        recorder.stop();
        var blob = recorder.getBlob();
        var url = URL.createObjectURL(blob);
        var div = document.createElement('div');
        var au = document.createElement('audio');
        var hf = document.createElement('a');
        au.controls = true;
        au.src = url;
        hf.href = url;
        hf.download = new Date().toISOString() + '.wav';
        hf.innerHTML = hf.download;
        div.appendChild(au);
        div.appendChild(hf);
        recordingslist.appendChild(div);
      }
      function playRecording() {
        recorder.play(audio);
      }
      function uploadAudio() {
        recorder.upload("Handler1.ashx", function(state, e) {
          switch(state) {
            case 'uploading':
              //var percentComplete = Math.round(e.loaded * 100 / e.total) + '%';
              break;
            case 'ok':
              //alert(e.target.responseText);
              alert("上传成功");
              break;
            case 'error':
              alert("上传失败");
              break;
            case 'cancel':
              alert("上传被取消");
              break;
          }
        });
      }
    </script>
  </body>
</html>

HZRecorder.js

(function (window) {
  //兼容
  window.URL = window.URL || window.webkitURL;
  navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
  var HZRecorder = function (stream, config) {
    config = config || {};
    config.sampleBits = config.sampleBits || 8   //采样数位 8, 16
    config.sampleRate = config.sampleRate || (44100 / 6);  //采样率(1/6 44100)
    var context = new (window.webkitAudioContext || window.AudioContext)();
    var audioInput = context.createMediaStreamSource(stream);
    var createScript = context.createScriptProcessor || context.createJavaScriptNode;
    var recorder = createScript.apply(context, [4096, 1, 1]);
    var mp3ReceiveSuccess, currentErrorCallback;
    var audioData = {
      size: 0     //录音文件长度
      , buffer: []   //录音缓存
      , inputSampleRate: context.sampleRate  //输入采样率
      , inputSampleBits: 16    //输入采样数位 8, 16
      , outputSampleRate: config.sampleRate  //输出采样率
      , oututSampleBits: config.sampleBits    //输出采样数位 8, 16
      , input: function (data) {
        this.buffer.push(new Float32Array(data));
        this.size += data.length;
      }
      , compress: function () { //合并压缩
        //合并
        var data = new Float32Array(this.size);
        var offset = 0;
        for (var i = 0; i < this.buffer.length; i++) {
          data.set(this.buffer[i], offset);
          offset += this.buffer[i].length;
        }
        //压缩
        var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
        var length = data.length / compression;
        var result = new Float32Array(length);
        var index = 0, j = 0;
        while (index < length) {
          result[index] = data[j];
          j += compression;
          index++;
        }
        return result;
      }
      , encodeWAV: function () {
        var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
        var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
        var bytes = this.compress();
        var dataLength = bytes.length * (sampleBits / 8);
        var buffer = new ArrayBuffer(44 + dataLength);
        var data = new DataView(buffer);
        var channelCount = 1;//单声道
        var offset = 0;
        var writeString = function (str) {
          for (var i = 0; i < str.length; i++) {
            data.setUint8(offset + i, str.charCodeAt(i));
          }
        }
        // 资源交换文件标识符 
        writeString('RIFF'); offset += 4;
        // 下个地址开始到文件尾总字节数,即文件大小-8 
        data.setUint32(offset, 36 + dataLength, true); offset += 4;
        // WAV文件标志
        writeString('WAVE'); offset += 4;
        // 波形格式标志 
        writeString('fmt '); offset += 4;
        // 过滤字节,一般为 0x10 = 16 
        data.setUint32(offset, 16, true); offset += 4;
        // 格式类别 (PCM形式采样数据) 
        data.setUint16(offset, 1, true); offset += 2;
        // 通道数 
        data.setUint16(offset, channelCount, true); offset += 2;
        // 采样率,每秒样本数,表示每个通道的播放速度 
        data.setUint32(offset, sampleRate, true); offset += 4;
        // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8 
        data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
        // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8 
        data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
        // 每样本数据位数 
        data.setUint16(offset, sampleBits, true); offset += 2;
        // 数据标识符 
        writeString('data'); offset += 4;
        // 采样数据总数,即数据总大小-44 
        data.setUint32(offset, dataLength, true); offset += 4;
        // 写入采样数据 
        if (sampleBits === 8) {
          for (var i = 0; i < bytes.length; i++, offset++) {
            var s = Math.max(-1, Math.min(1, bytes[i]));
            var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
            val = parseInt(255 / (65535 / (val + 32768)));
            data.setInt8(offset, val, true);
          }
        } else {
          for (var i = 0; i < bytes.length; i++, offset += 2) {
            var s = Math.max(-1, Math.min(1, bytes[i]));
            data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
          }
        }
        return new Blob([data], { type: 'audio/wav' });
      }
    };
    //开始录音
    this.start = function () {
      audioInput.connect(recorder);
      recorder.connect(context.destination);
    }
    //停止
    this.stop = function () {
      recorder.disconnect();
    }
    //获取音频文件
    this.getBlob = function () {
      this.stop();
      return audioData.encodeWAV();
    }
    //回放
    this.play = function (audio) {
      audio.src = window.URL.createObjectURL(this.getBlob());
    }
    //上传
    this.upload = function (url, callback) {
      var fd = new FormData();
      fd.append("audioData", this.getBlob());
      var xhr = new XMLHttpRequest();
      if (callback) {
        xhr.upload.addEventListener("progress", function (e) {
          callback('uploading', e);
        }, false);
        xhr.addEventListener("load", function (e) {
          callback('ok', e);
        }, false);
        xhr.addEventListener("error", function (e) {
          callback('error', e);
        }, false);
        xhr.addEventListener("abort", function (e) {
          callback('cancel', e);
        }, false);
      }
      xhr.open("POST", url);
      xhr.send(fd);
    }
    //音频采集
    recorder.onaudioprocess = function (e) {
      audioData.input(e.inputBuffer.getChannelData(0));
      //record(e.inputBuffer.getChannelData(0));
    }
  };
  //抛出异常
  HZRecorder.throwError = function (message) {
    alert(message);
    throw new function () { this.toString = function () { return message; } }
  }
  //是否支持录音
  HZRecorder.canRecording = (navigator.getUserMedia != null);
  //获取录音机
  HZRecorder.get = function (callback, config) {
    if (callback) {
      if (navigator.getUserMedia) {
        navigator.getUserMedia(
          { audio: true } //只启用音频
          , function (stream) {
            var rec = new HZRecorder(stream, config);
            callback(rec);
          }
          , function (error) {
            switch (error.code || error.name) {
              case 'PERMISSION_DENIED':
              case 'PermissionDeniedError':
                HZRecorder.throwError('用户拒绝提供信息。');
                break;
              case 'NOT_SUPPORTED_ERROR':
              case 'NotSupportedError':
                HZRecorder.throwError('浏览器不支持硬件设备。');
                break;
              case 'MANDATORY_UNSATISFIED_ERROR':
              case 'MandatoryUnsatisfiedError':
                HZRecorder.throwError('无法发现指定的硬件设备。');
                break;
              default:
                HZRecorder.throwError('无法打开麦克风。异常信息:' + (error.code || error.name));
                break;
            }
          });
      } else {
        HZRecorder.throwErr('当前浏览器不支持录音功能。'); return;
      }
    }
  }
  window.HZRecorder = HZRecorder;
})(window);

总结

以上所述是小编给大家介绍的HTML5声音录制/播放功能的实现代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对葡京娱乐官方网站站的支持!

 

本文地址:http://www.koalacac.com/a/question/98596.html
Tags: HTML5 声音 录制
编辑:葡京娱乐官方网站
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