摘要：一瀏覽器錄音功能二業務代碼錄音停止播放提交取消上傳成功上傳失敗上傳被取消三錄音文件兼容獲取計算機的設備攝像頭或者錄音設備采樣數位采樣率創建一個音頻環境對象第二個和第三個參數指的是輸入和輸出都是單聲道是雙聲道。

三、錄音文件

//兼容
window.URL = window.URL || window.webkitURL;
//獲取計算機的設備：攝像頭或者錄音設備
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;

var HZRecorder = function (stream, config) {
    config = config || {};
    config.sampleBits = config.sampleBits || 8;      //采樣數位 8, 16
    config.sampleRate = config.sampleRate || (44100 / 6);   //采樣率(1/6 44100)

    //創建一個音頻環境對象
    var audioContext = window.AudioContext || window.webkitAudioContext;
    var context = new audioContext();
    var audioInput = context.createMediaStreamSource(stream);
    // 第二個和第三個參數指的是輸入和輸出都是單聲道,2是雙聲道。
    var recorder = context.createScriptProcessor(4096, 1, 1);

    var audioData = {
        size: 0          //錄音文件長度
        , buffer: []     //錄音緩存
        , inputSampleRate: context.sampleRate    //輸入采樣率
        , inputSampleBits: 16       //輸入采樣數位 8, 16
        , outputSampleRate: config.sampleRate    //輸出采樣率
        , outputSampleBits: config.sampleBits       //輸出采樣數位 8, 16
        , input: function (data) {
            this.buffer.push(new Float32Array(data));
            this.size += data.length;
        }
        , compress: function () { //合并壓縮
            //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;
            }
            //壓縮
            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.outputSampleBits);
            var bytes = this.compress();
            var dataLength = bytes.length * (sampleBits / 8);
            var buffer = new ArrayBuffer(44 + dataLength);
            var data = new DataView(buffer);

            var channelCount = 1;//單聲道
            var offset = 0;

            var writeString = function (str) {
                for (var i = 0; i < str.length; i++) {
                    data.setUint8(offset + i, str.charCodeAt(i));
                }
            }

            // 資源交換文件標識符
            writeString("RIFF"); offset += 4;
            // 下個地址開始到文件尾總字節數,即文件大小-8
            data.setUint32(offset, 36 + dataLength, true); offset += 4;
            // WAV文件標志
            writeString("WAVE"); offset += 4;
            // 波形格式標志
            writeString("fmt "); offset += 4;
            // 過濾字節,一般為 0x10 = 16
            data.setUint32(offset, 16, true); offset += 4;
            // 格式類別 (PCM形式采樣數據)
            data.setUint16(offset, 1, true); offset += 2;
            // 通道數
            data.setUint16(offset, channelCount, true); offset += 2;
            // 采樣率,每秒樣本數,表示每個通道的播放速度
            data.setUint32(offset, sampleRate, true); offset += 4;
            // 波形數據傳輸率 (每秒平均字節數) 單聲道×每秒數據位數×每樣本數據位/8
            data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
            // 快數據調整數 采樣一次占用字節數 單聲道×每樣本的數據位數/8
            data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
            // 每樣本數據位數
            data.setUint16(offset, sampleBits, true); offset += 2;
            // 數據標識符
            writeString("data"); offset += 4;
            // 采樣數據總數,即數據總大小-44
            data.setUint32(offset, dataLength, true); offset += 4;
            // 寫入采樣數據
            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/mp3" });
        }
    };

    //開始錄音
    this.start = function () {
        audioInput.connect(recorder);
        recorder.connect(context.destination);
    }

    //停止
    this.stop = function () {
        recorder.disconnect();
    }

    //獲取音頻文件
    this.getBlob = function () {
        this.stop();
        return audioData.encodeWAV();
    }

    //回放
    this.play = function (audio) {
        audio.src = window.URL.createObjectURL(this.getBlob());
    }
    //清除
    this.clear = function(){
        audioData.buffer=[];
        audioData.size=0;
    }

    //上傳
    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);
    }

    //音頻采集
    recorder.onaudioprocess = function (e) {
        audioData.input(e.inputBuffer.getChannelData(0));
        //record(e.inputBuffer.getChannelData(0));
    }

};
//拋出異常
HZRecorder.throwError = function (message) {
    alert(message);
    throw new function () { this.toString = function () { return message; } }
}
//是否支持錄音
HZRecorder.canRecording = (navigator.getUserMedia != null);
//獲取錄音機
HZRecorder.get = function (callback, config) {
    if (callback) {
        if (navigator.getUserMedia) {
            navigator.getUserMedia(
                { audio: true } //只啟用音頻
                , function (stream) {
                    var rec = new HZRecorder(stream, config);
                    callback(rec);
                }
                , function (error) {
                    switch (error.code || error.name) {
                        case "PERMISSION_DENIED":
                        case "PermissionDeniedError":
                            HZRecorder.throwError("用戶拒絕提供信息。");
                            break;
                        case "NOT_SUPPORTED_ERROR":
                        case "NotSupportedError":
                            HZRecorder.throwError("瀏覽器不支持硬件設備。");
                            break;
                        case "MANDATORY_UNSATISFIED_ERROR":
                        case "MandatoryUnsatisfiedError":
                            HZRecorder.throwError("無法發現指定的硬件設備。");
                            break;
                        default:
                            HZRecorder.throwError("無法打開麥克風。異常信息:" + (error.code || error.name));
                            break;
                    }
                });
        } else {
            HZRecorder.throwErr("當前瀏覽器不支持錄音功能。"); return;
        }
    }
};

https://github.com/silenceboy...