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* @author j_bleach 2018/8/18\r\n * @describe 媒体记录（包含开始，暂停，停止等媒体流及回调操作）\r\n * @param Target 被装饰类（AudioAnalyser）\r\n */\r\nimport convertWav from \"./audioConvertWav\";\r\nimport WebWorker from \"./mp3worker.js\";\r\n\r\nconst MediaRecorderFn = Target => {\r\n    const constraints = {audio: true};\r\n    const mp3Worker = new Worker(WebWorker);\r\n    return class MediaRecorderClass extends Target {\r\n        static audioChunk = [] // 音频信息存储对象\r\n        static mediaRecorder = null // 媒体记录对象\r\n        static audioCtx = new (window.AudioContext || window.webkitAudioContext)(); // 音频上下文\r\n\r\n        constructor(props) {\r\n            super(props);\r\n            MediaRecorderClass.compatibility();\r\n            this.analyser = MediaRecorderClass.audioCtx.createAnalyser();\r\n        }\r\n\r\n        /**\r\n         * @author j_bleach 2018/08/02 17:06\r\n         * @describe 浏览器navigator.mediaDevices兼容性处理\r\n         */\r\n        static compatibility() {\r\n            const promisifiedOldGUM = (constraints) => {\r\n                // First get ahold of getUserMedia, if present\r\n                const getUserMedia =\r\n                    navigator.getUserMedia ||\r\n                    navigator.webkitGetUserMedia ||\r\n                    navigator.mozGetUserMedia;\r\n\r\n                // Some browsers just don't implement it - return a rejected promise with an error\r\n                // to keep a consistent interface\r\n                if (!getUserMedia) {\r\n                    MediaRecorderClass.checkAndExecFn(this.props.errorCallback);\r\n                    return Promise.reject(\r\n                        new Error(\"getUserMedia is not implemented in this browser\")\r\n                    );\r\n                }\r\n                // Otherwise, wrap the call to the old navigator.getUserMedia with a Promise\r\n                return new Promise(function (resolve, reject) {\r\n                    getUserMedia.call(navigator, constraints, resolve, reject);\r\n                });\r\n            };\r\n\r\n            // Older browsers might not implement mediaDevices at all, so we set an empty object first\r\n            if (navigator.mediaDevices === undefined) {\r\n                navigator.mediaDevices = {};\r\n            }\r\n\r\n            // Some browsers partially implement mediaDevices. We can't just assign an object\r\n            // with getUserMedia as it would overwrite existing properties.\r\n            // Here, we will just add the getUserMedia property if it's missing.\r\n            if (navigator.mediaDevices.getUserMedia === undefined) {\r\n                navigator.mediaDevices.getUserMedia = promisifiedOldGUM;\r\n            }\r\n        }\r\n\r\n        /**\r\n         * @author j_bleach 2018/8/19\r\n         * @describe 验证函数，如果存在即执行\r\n         * @param fn: function 被验证函数\r\n         * @param e: object 事件对象 event object\r\n         */\r\n        static checkAndExecFn(fn, e) {\r\n            typeof fn === \"function\" && fn(e)\r\n        }\r\n\r\n        /**\r\n         * @author j_bleach 2018/8/19\r\n         * @describe 音频流转blob对象\r\n         * @param type: string 音频的mime-type\r\n         * @param cb: function 录音停止回调\r\n         */\r\n        static audioStream2Blob(type, audioOptions, cb) {\r\n            let wavBlob = null;\r\n            const chunk = MediaRecorderClass.audioChunk;\r\n            const audioWav = () => {\r\n                let fr = new FileReader();\r\n                fr.readAsArrayBuffer(new Blob(chunk, {type}))\r\n                let frOnload = (e) => {\r\n                    const buffer = e.target.result\r\n                    MediaRecorderClass.audioCtx.decodeAudioData(buffer).then(data => {\r\n                        wavBlob = new Blob([new DataView(convertWav(data, audioOptions))], {\r\n                            type: \"audio/wav\"\r\n                        })\r\n                        MediaRecorderClass.checkAndExecFn(cb, wavBlob);\r\n                    })\r\n                }\r\n                fr.onload = frOnload\r\n            }\r\n            const audioMp3 = () => {\r\n                let fr = new FileReader();\r\n                fr.readAsArrayBuffer(new Blob(chunk, {type: \"audio/wav\"}))\r\n                let frOnload = (e) => {\r\n                    const buffer = e.target.result;\r\n                    MediaRecorderClass.audioCtx.decodeAudioData(buffer).then(data => {\r\n                        const wavBuf = convertWav(data, audioOptions)\r\n                        mp3Worker.postMessage({\r\n                            cmd: \"init\",\r\n                            config: {bitRate: 128}\r\n                        });\r\n                        mp3Worker.postMessage({cmd: \"encode\", rawInput: wavBuf});\r\n                        mp3Worker.postMessage({cmd: \"finish\"});\r\n\r\n                        mp3Worker.onmessage = (e) => {\r\n                            if (e.data.cmd == \"end\") {\r\n                                const mp3Blob = new Blob(e.data.buf, {type});\r\n                                MediaRecorderClass.checkAndExecFn(cb, mp3Blob);\r\n                            }\r\n                        };\r\n                    })\r\n                }\r\n                fr.onload = frOnload\r\n            }\r\n            switch (type) {\r\n                case \"audio/webm\":\r\n                    MediaRecorderClass.checkAndExecFn(cb, new Blob(chunk, {type}));\r\n                    break;\r\n                case \"audio/wav\":\r\n                    audioWav();\r\n                    break;\r\n                case \"audio/mp3\":\r\n                    audioMp3();\r\n                    break;\r\n                default:\r\n                    return void 0\r\n            }\r\n        }\r\n\r\n        /**\r\n         * @author j_bleach 2018/8/18\r\n         * @describe 开始录音\r\n         */\r\n        startAudio = () => {\r\n            const recorder = MediaRecorderClass.mediaRecorder;\r\n            if (!recorder || (recorder && recorder.state === \"inactive\")) {\r\n                navigator.mediaDevices.getUserMedia(constraints).then(stream => {\r\n                    this.recordAudio(stream);\r\n                }).catch(err => {\r\n                        MediaRecorderClass.checkAndExecFn(this.props.errorCallback, err);\r\n                        // throw new Error(\"getUserMedia failed:\", err);\r\n                    }\r\n                )\r\n                return false\r\n            }\r\n            if (recorder && recorder.state === \"paused\") {\r\n                MediaRecorderClass.resumeAudio();\r\n            }\r\n        }\r\n        /**\r\n         * @author j_bleach 2018/8/19\r\n         * @describe 暂停录音\r\n         */\r\n        pauseAudio = () => {\r\n            const recorder = MediaRecorderClass.mediaRecorder;\r\n            if (recorder && recorder.state === \"recording\") {\r\n                recorder.pause();\r\n                recorder.onpause = () => {\r\n                    MediaRecorderClass.checkAndExecFn(this.props.pauseCallback);\r\n                }\r\n                MediaRecorderClass.audioCtx.suspend();\r\n            }\r\n        }\r\n        /**\r\n         * @author j_bleach 2018/8/18\r\n         * @describe 停止录音\r\n         */\r\n        stopAudio = () => {\r\n            const {audioType, audioOptions} = this.props;\r\n            const recorder = MediaRecorderClass.mediaRecorder;\r\n            if (recorder && [\"recording\", \"paused\"].includes(recorder.state)) {\r\n                recorder.stop();\r\n                recorder.onstop = () => {\r\n                    MediaRecorderClass.audioStream2Blob(audioType, audioOptions, this.props.stopCallback);\r\n                    MediaRecorderClass.audioChunk = []; // 结束后，清空音频存储\r\n                }\r\n                MediaRecorderClass.audioCtx.suspend();\r\n                this.initCanvas();\r\n            }\r\n        }\r\n\r\n        /**\r\n         * @author j_bleach 2018/8/18\r\n         * @describe mediaRecorder音频记录\r\n         * @param stream: binary data 音频流\r\n         */\r\n        recordAudio(stream) {\r\n            const {audioBitsPerSecond, mimeType, timeslice} = this.props;\r\n            MediaRecorderClass.mediaRecorder = new MediaRecorder(stream, {audioBitsPerSecond, mimeType});\r\n            MediaRecorderClass.mediaRecorder.ondataavailable = (event) => {\r\n                MediaRecorderClass.checkAndExecFn(this.props.onRecordCallback, event.data);\r\n                MediaRecorderClass.audioChunk.push(event.data);\r\n            }\r\n            MediaRecorderClass.audioCtx.resume();\r\n            MediaRecorderClass.mediaRecorder.start(timeslice);\r\n            MediaRecorderClass.mediaRecorder.onstart = (e) => {\r\n                MediaRecorderClass.checkAndExecFn(this.props.startCallback, e);\r\n            }\r\n            MediaRecorderClass.mediaRecorder.onresume = (e) => {\r\n                this.initAudioAnalyser(stream)\r\n                MediaRecorderClass.checkAndExecFn(this.props.startCallback, e);\r\n            }\r\n            MediaRecorderClass.mediaRecorder.onerror = (e) => {\r\n                MediaRecorderClass.checkAndExecFn(this.props.errorCallback, e);\r\n            }\r\n            this.initAudioAnalyser(stream)\r\n            this.renderCurve(this.analyser);\r\n        }\r\n\r\n        /**\r\n        * @author j_bleach 2019/10/31\r\n        * @describe 重置音频上下文（解决谷歌浏览器 音频数组链接断开问题）\r\n        */\r\n\r\n        initAudioAnalyser(stream){\r\n          this.analyser = MediaRecorderClass.audioCtx.createAnalyser();\r\n          const source = MediaRecorderClass.audioCtx.createMediaStreamSource(stream);\r\n          source.connect(this.analyser);\r\n        }\r\n\r\n        /**\r\n         * @author j_bleach 2018/8/19\r\n         * @describe 恢复录音\r\n         */\r\n        static resumeAudio() {\r\n            MediaRecorderClass.audioCtx.resume();\r\n            MediaRecorderClass.mediaRecorder.resume();\r\n        }\r\n    }\r\n}\r\nexport default MediaRecorderFn;"]}