h5錄音功能

<span style="white-space:pre"></span><audio controls autoplay></audio>  
<input type="button" value="開始錄音" onclick="startRecording()"/>  
<input type="button" value="獲取錄音" onclick="obtainRecord()"/>  
<input type="button" value="停止錄音" onclick="stopRecord()"/>  
<input type="button" value="播放錄音" onclick="playRecord()"/>  
  
<video id="video1" width="320px" height="240px" controls autoplay ></video>  
<video id="video2" width="320px" height="240px" controls autoplay ></video>  
<canvas id="canvas1" width="320" height="240"></canvas>  
<input type="button" value="拍攝" onclick="scamera()"/>  
<input type="button" value="播放視頻" onclick="playVideo()"/>

(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  
        audioContext = window.AudioContext || window.webkitAudioContext;  
        var context = new audioContext();  
  
        //將聲音輸入這個對像  
        var audioInput = context.createMediaStreamSource(stream);  
          
        //設置音量節點  
        var volume = context.createGain();  
        audioInput.connect(volume);  
  
        //創建緩存，用來緩存聲音  
        var bufferSize = 4096;  
  
        // 創建聲音的緩存節點，createScriptProcessor方法的  
        // 第二個和第三個參數指的是輸入和輸出都是雙聲道。  
        var recorder = context.createScriptProcessor(bufferSize, 2, 2);  
  
        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  
            , oututSampleBits: 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 () { //合並壓縮  
                //合並  
                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.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;//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/wav' });  
            }  
        };  
  
        //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());  
        };  
  
        //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) {  
        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('<a href="http://www.it165.net/edu/ewl/" target="_blank" class="keylink">瀏覽器</a>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<a href="http://www.it165.net/edu/ewl/" target="_blank" class="keylink">瀏覽器</a>不支持錄音功能。'); return;  
            }  
        }  
    };  
    window.HZRecorder = HZRecorder;  
  
})(window);

 

/* 音頻 */  
var recorder;  
var audio = document.querySelector('audio');  
  
function startRecording() {  
    HZRecorder.get(function (rec) {  
        recorder = rec;  
        recorder.start();  
    });  
}  
  
  
function obtainRecord(){  
    var record = recorder.getBlob();  
    debugger;  
};  
  
function stopRecord(){  
    recorder.stop();  
};  
  
function playRecord(){  
    recorder.play(audio);  
};  
  
/* 視頻 */  
function scamera() {  
    var videoElement = document.getElementById('video1');  
    var canvasObj = document.getElementById('canvas1');  
    var context1 = canvasObj.getContext('2d');  
    context1.fillStyle = "#ffffff";  
    context1.fillRect(0, 0, 320, 240);  
    context1.drawImage(videoElement, 0, 0, 320, 240);  
};  
  
function playVideo(){  
    var videoElement1 = document.getElementById('video1');  
    var videoElement2 = document.getElementById('video2');  
    videoElement2.setAttribute("src", videoElement1);  
}