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@typedef {Object} ListenerDescriptor\n * @property {string} name The name of the event\n * @property {function} callback The callback\n * @property {function} un The function to call to remove the listener\n */\n\n/**\n * Observer class\n */\nexport default class Observer {\n    /**\n     * Instantiate Observer\n     */\n    constructor() {\n        /**\n         * @private\n         * @todo Initialise the handlers here already and remove the conditional\n         * assignment in `on()`\n         */\n        this.handlers = null;\n    }\n    /**\n     * Attach a handler function for an event.\n     *\n     * @param {string} event Name of the event to listen to\n     * @param {function} fn The callback to trigger when the event is fired\n     * @return {ListenerDescriptor} The event descriptor\n     */\n    on(event, fn) {\n        if (!this.handlers) {\n            this.handlers = {};\n        }\n\n        let handlers = this.handlers[event];\n        if (!handlers) {\n            handlers = this.handlers[event] = [];\n        }\n        handlers.push(fn);\n\n        // Return an event descriptor\n        return {\n            name: event,\n            callback: fn,\n            un: (e, fn) => this.un(e, fn)\n        };\n    }\n\n    /**\n     * Remove an event handler.\n     *\n     * @param {string} event Name of the event the listener that should be\n     * removed listens to\n     * @param {function} fn The callback that should be removed\n     */\n    un(event, fn) {\n        if (!this.handlers) {\n            return;\n        }\n\n        const handlers = this.handlers[event];\n        let i;\n        if (handlers) {\n            if (fn) {\n                for (i = handlers.length - 1; i >= 0; i--) {\n                    if (handlers[i] == fn) {\n                        handlers.splice(i, 1);\n                    }\n                }\n            } else {\n                handlers.length = 0;\n            }\n        }\n    }\n\n    /**\n     * Remove all event handlers.\n     */\n    unAll() {\n        this.handlers = null;\n    }\n\n    /**\n     * Attach a handler to an event. 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`requestAnimationFrame` function for the browser, or a shim with\n * `setTimeout` if the function is not found\n *\n * @return {function} Available `requestAnimationFrame` function for the browser\n */\nexport default (\n    window.requestAnimationFrame ||\n    window.webkitRequestAnimationFrame ||\n    window.mozRequestAnimationFrame ||\n    window.oRequestAnimationFrame ||\n    window.msRequestAnimationFrame ||\n    ((callback, element) => setTimeout(callback, 1000 / 60))\n).bind(window);\n","import * as util from './util';\n\n// using constants to prevent someone writing the string wrong\nconst PLAYING = 'playing';\nconst PAUSED = 'paused';\nconst FINISHED = 'finished';\n\n/**\n * WebAudio backend\n *\n * @extends {Observer}\n */\nexport default class WebAudio extends util.Observer {\n    /** scriptBufferSize: size of the processing buffer */\n    static scriptBufferSize = 256;\n    /** audioContext: allows to process audio with WebAudio API */\n    audioContext = null;\n    /** @private */\n    offlineAudioContext = null;\n    /** @private */\n    stateBehaviors = {\n        [PLAYING]: {\n            init() {\n                this.addOnAudioProcess();\n            },\n            getPlayedPercents() {\n                const duration = this.getDuration();\n                return this.getCurrentTime() / duration || 0;\n            },\n            getCurrentTime() {\n                return this.startPosition + this.getPlayedTime();\n            }\n        },\n        [PAUSED]: {\n            init() {\n                this.removeOnAudioProcess();\n            },\n            getPlayedPercents() {\n                const duration = this.getDuration();\n                return this.getCurrentTime() / duration || 0;\n            },\n            getCurrentTime() {\n                return this.startPosition;\n            }\n        },\n        [FINISHED]: {\n            init() {\n                this.removeOnAudioProcess();\n                this.fireEvent('finish');\n            },\n            getPlayedPercents() {\n                return 1;\n            },\n            getCurrentTime() {\n                return this.getDuration();\n            }\n        }\n    };\n\n    /**\n     * Does the browser support this backend\n     *\n     * @return {boolean} Whether or not this browser supports this backend\n     */\n    supportsWebAudio() {\n        return !!(window.AudioContext || window.webkitAudioContext);\n    }\n\n    /**\n     * Get the audio context used by this backend or create one\n     *\n     * @return {AudioContext} Existing audio context, or creates a new one\n     */\n    getAudioContext() {\n        if (!window.WaveSurferAudioContext) {\n            window.WaveSurferAudioContext = new (window.AudioContext ||\n                window.webkitAudioContext)();\n        }\n        return window.WaveSurferAudioContext;\n    }\n\n    /**\n     * Get the offline audio context used by this backend or create one\n     *\n     * @param {number} sampleRate The sample rate to use\n     * @return {OfflineAudioContext} Existing offline audio context, or creates\n     * a new one\n     */\n    getOfflineAudioContext(sampleRate) {\n        if (!window.WaveSurferOfflineAudioContext) {\n            window.WaveSurferOfflineAudioContext = new (window.OfflineAudioContext ||\n                window.webkitOfflineAudioContext)(1, 2, sampleRate);\n        }\n        return window.WaveSurferOfflineAudioContext;\n    }\n\n    /**\n     * Construct the backend\n     *\n     * @param {WavesurferParams} params Wavesurfer parameters\n     */\n    constructor(params) {\n        super();\n        /** @private */\n        this.params = params;\n        /** ac: Audio Context instance */\n        this.ac =\n            params.audioContext ||\n            (this.supportsWebAudio() ? this.getAudioContext() : {});\n        /**@private */\n        this.lastPlay = this.ac.currentTime;\n        /** @private */\n        this.startPosition = 0;\n        /** @private  */\n        this.scheduledPause = null;\n        /** @private */\n        this.states = {\n            [PLAYING]: Object.create(this.stateBehaviors[PLAYING]),\n            [PAUSED]: Object.create(this.stateBehaviors[PAUSED]),\n            [FINISHED]: Object.create(this.stateBehaviors[FINISHED])\n        };\n        /** @private */\n        this.buffer = null;\n        /** @private */\n        this.filters = [];\n        /** gainNode: allows to control audio volume */\n        this.gainNode = null;\n        /** @private */\n        this.mergedPeaks = null;\n        /** @private */\n        this.offlineAc = null;\n        /** @private */\n        this.peaks = null;\n        /** @private */\n        this.playbackRate = 1;\n        /** analyser: provides audio analysis information */\n        this.analyser = null;\n        /** scriptNode: allows processing audio */\n        this.scriptNode = null;\n        /** @private */\n        this.source = null;\n        /** @private */\n        this.splitPeaks = [];\n        /** @private */\n        this.state = null;\n        /** @private */\n        this.explicitDuration = params.duration;\n        /**\n         * Boolean indicating if the backend was destroyed.\n         */\n        this.destroyed = false;\n    }\n\n    /**\n     * Initialise the backend, called in `wavesurfer.createBackend()`\n     */\n    init() {\n        this.createVolumeNode();\n        this.createScriptNode();\n        this.createAnalyserNode();\n\n        this.setState(PAUSED);\n        this.setPlaybackRate(this.params.audioRate);\n        this.setLength(0);\n    }\n\n    /** @private */\n    disconnectFilters() {\n        if (this.filters) {\n            this.filters.forEach(filter => {\n                filter && filter.disconnect();\n            });\n            this.filters = null;\n            // Reconnect direct path\n            this.analyser.connect(this.gainNode);\n        }\n    }\n\n    /**\n     * @private\n     *\n     * @param {string} state The new state\n     */\n    setState(state) {\n        if (this.state !== this.states[state]) {\n            this.state = this.states[state];\n            this.state.init.call(this);\n        }\n    }\n\n    /**\n     * Unpacked `setFilters()`\n     *\n     * @param {...AudioNode} filters One or more filters to set\n     */\n    setFilter(...filters) {\n        this.setFilters(filters);\n    }\n\n    /**\n     * Insert custom Web Audio nodes into the graph\n     *\n     * @param {AudioNode[]} filters Packed filters array\n     * @example\n     * const lowpass = wavesurfer.backend.ac.createBiquadFilter();\n     * wavesurfer.backend.setFilter(lowpass);\n     */\n    setFilters(filters) {\n        // Remove existing filters\n        this.disconnectFilters();\n\n        // Insert filters if filter array not empty\n        if (filters && filters.length) {\n            this.filters = filters;\n\n            // Disconnect direct path before inserting filters\n            this.analyser.disconnect();\n\n            // Connect each filter in turn\n            filters\n                .reduce((prev, curr) => {\n                    prev.connect(curr);\n                    return curr;\n                }, this.analyser)\n                .connect(this.gainNode);\n        }\n    }\n    /** Create ScriptProcessorNode to process audio */\n    createScriptNode() {\n        if (this.params.audioScriptProcessor) {\n            this.scriptNode = this.params.audioScriptProcessor;\n        } else {\n            if (this.ac.createScriptProcessor) {\n                this.scriptNode = this.ac.createScriptProcessor(\n                    WebAudio.scriptBufferSize\n                );\n            } else {\n                this.scriptNode = this.ac.createJavaScriptNode(\n                    WebAudio.scriptBufferSize\n                );\n            }\n        }\n        this.scriptNode.connect(this.ac.destination);\n    }\n\n    /** @private */\n    addOnAudioProcess() {\n        this.scriptNode.onaudioprocess = () => {\n            const time = this.getCurrentTime();\n\n            if (time >= this.getDuration()) {\n                this.setState(FINISHED);\n                this.fireEvent('pause');\n            } else if (time >= this.scheduledPause) {\n                this.pause();\n            } else if (this.state === this.states[PLAYING]) {\n                this.fireEvent('audioprocess', time);\n            }\n        };\n    }\n\n    /** @private */\n    removeOnAudioProcess() {\n        this.scriptNode.onaudioprocess = () => {};\n    }\n    /** Create analyser node to perform audio analysis */\n    createAnalyserNode() {\n        this.analyser = this.ac.createAnalyser();\n        this.analyser.connect(this.gainNode);\n    }\n\n    /**\n     * Create the gain node needed to control the playback volume.\n     *\n     */\n    createVolumeNode() {\n        // Create gain node using the AudioContext\n        if (this.ac.createGain) {\n            this.gainNode = this.ac.createGain();\n        } else {\n            this.gainNode = this.ac.createGainNode();\n        }\n        // Add the gain node to the graph\n        this.gainNode.connect(this.ac.destination);\n    }\n\n    /**\n     * Set the sink id for the media player\n     *\n     * @param {string} deviceId String value representing audio device id.\n     * @returns {Promise} A Promise that resolves to `undefined` when there\n     * are no errors.\n     */\n    setSinkId(deviceId) {\n        if (deviceId) {\n            /**\n             * The webaudio API doesn't currently support setting the device\n             * output. Here we create an HTMLAudioElement, connect the\n             * webaudio stream to that element and setSinkId there.\n             */\n            let audio = new window.Audio();\n            if (!audio.setSinkId) {\n                return Promise.reject(\n                    new Error('setSinkId is not supported in your browser')\n                );\n            }\n            audio.autoplay = true;\n            var dest = this.ac.createMediaStreamDestination();\n            this.gainNode.disconnect();\n            this.gainNode.connect(dest);\n            audio.srcObject = dest.stream;\n\n            return audio.setSinkId(deviceId);\n        } else {\n            return Promise.reject(new Error('Invalid deviceId: ' + deviceId));\n        }\n    }\n\n    /**\n     * Set the audio volume\n     *\n     * @param {number} value A floating point value between 0 and 1.\n     */\n    setVolume(value) {\n        this.gainNode.gain.setValueAtTime(value, this.ac.currentTime);\n    }\n\n    /**\n     * Get the current volume\n     *\n     * @return {number} value A floating point value between 0 and 1.\n     */\n    getVolume() {\n        return this.gainNode.gain.value;\n    }\n\n    /**\n     * Decode an array buffer and pass data to a callback\n     *\n     * @private\n     * @param {ArrayBuffer} arraybuffer The array buffer to decode\n     * @param {function} callback The function to call on complete.\n     * @param {function} errback The function to call on error.\n     */\n    decodeArrayBuffer(arraybuffer, callback, errback) {\n        if (!this.offlineAc) {\n            this.offlineAc = this.getOfflineAudioContext(\n                this.ac && this.ac.sampleRate ? this.ac.sampleRate : 44100\n            );\n        }\n        this.offlineAc.decodeAudioData(\n            arraybuffer,\n            data => callback(data),\n            errback\n        );\n    }\n\n    /**\n     * Set pre-decoded peaks\n     *\n     * @param {number[]|Number.<Array[]>} peaks Peaks data\n     * @param {?number} duration Explicit duration\n     */\n    setPeaks(peaks, duration) {\n        if (duration != null) {\n            this.explicitDuration = duration;\n        }\n        this.peaks = peaks;\n    }\n\n    /**\n     * Set the rendered length (different from the length of the audio)\n     *\n     * @param {number} length The rendered length\n     */\n    setLength(length) {\n        // No resize, we can preserve the cached peaks.\n        if (this.mergedPeaks && length == 2 * this.mergedPeaks.length - 1 + 2) {\n            return;\n        }\n\n        this.splitPeaks = [];\n        this.mergedPeaks = [];\n        // Set the last element of the sparse array so the peak arrays are\n        // appropriately sized for other calculations.\n        const channels = this.buffer ? this.buffer.numberOfChannels : 1;\n        let c;\n        for (c = 0; c < channels; c++) {\n            this.splitPeaks[c] = [];\n            this.splitPeaks[c][2 * (length - 1)] = 0;\n            this.splitPeaks[c][2 * (length - 1) + 1] = 0;\n        }\n        this.mergedPeaks[2 * (length - 1)] = 0;\n        this.mergedPeaks[2 * (length - 1) + 1] = 0;\n    }\n\n    /**\n     * Compute the max and min value of the waveform when broken into <length> subranges.\n     *\n     * @param {number} length How many subranges to break the waveform into.\n     * @param {number} first First sample in the required range.\n     * @param {number} last Last sample in the required range.\n     * @return {number[]|Number.<Array[]>} Array of 2*<length> peaks or array of arrays of\n     * peaks consisting of (max, min) values for each subrange.\n     */\n    getPeaks(length, first, last) {\n        if (this.peaks) {\n            return this.peaks;\n        }\n        if (!this.buffer) {\n            return [];\n        }\n\n        first = first || 0;\n        last = last || length - 1;\n\n        this.setLength(length);\n\n        if (!this.buffer) {\n            return this.params.splitChannels\n                ? this.splitPeaks\n                : this.mergedPeaks;\n        }\n\n        /**\n         * The following snippet fixes a buffering data issue on the Safari\n         * browser which returned undefined It creates the missing buffer based\n         * on 1 channel, 4096 samples and the sampleRate from the current\n         * webaudio context 4096 samples seemed to be the best fit for rendering\n         * will review this code once a stable version of Safari TP is out\n         */\n        if (!this.buffer.length) {\n            const newBuffer = this.createBuffer(1, 4096, this.sampleRate);\n            this.buffer = newBuffer.buffer;\n        }\n\n        const sampleSize = this.buffer.length / length;\n        const sampleStep = ~~(sampleSize / 10) || 1;\n        const channels = this.buffer.numberOfChannels;\n        let c;\n\n        for (c = 0; c < channels; c++) {\n            const peaks = this.splitPeaks[c];\n            const chan = this.buffer.getChannelData(c);\n            let i;\n\n            for (i = first; i <= last; i++) {\n                const start = ~~(i * sampleSize);\n                const end = ~~(start + sampleSize);\n                let min = 0;\n                let max = 0;\n                let j;\n\n                for (j = start; j < end; j += sampleStep) {\n                    const value = chan[j];\n\n                    if (value > max) {\n                        max = value;\n                    }\n\n                    if (value < min) {\n                        min = value;\n                    }\n                }\n\n                peaks[2 * i] = max;\n                peaks[2 * i + 1] = min;\n\n                if (c == 0 || max > this.mergedPeaks[2 * i]) {\n                    this.mergedPeaks[2 * i] = max;\n                }\n\n                if (c == 0 || min < this.mergedPeaks[2 * i + 1]) {\n                    this.mergedPeaks[2 * i + 1] = min;\n                }\n            }\n        }\n\n        return this.params.splitChannels ? this.splitPeaks : this.mergedPeaks;\n    }\n\n    /**\n     * Get the position from 0 to 1\n     *\n     * @return {number} Position\n     */\n    getPlayedPercents() {\n        return this.state.getPlayedPercents.call(this);\n    }\n\n    /** @private */\n    disconnectSource() {\n        if (this.source) {\n            this.source.disconnect();\n        }\n    }\n\n    /**\n     * This is called when wavesurfer is destroyed\n     */\n    destroy() {\n        if (!this.isPaused()) {\n            this.pause();\n        }\n        this.unAll();\n        this.buffer = null;\n        this.destroyed = true;\n        this.disconnectFilters();\n        this.disconnectSource();\n        this.gainNode.disconnect();\n        this.scriptNode.disconnect();\n        this.analyser.disconnect();\n\n        // close the audioContext if closeAudioContext option is set to true\n        if (this.params.closeAudioContext) {\n            // check if browser supports AudioContext.close()\n            if (\n                typeof this.ac.close === 'function' &&\n                this.ac.state != 'closed'\n            ) {\n                this.ac.close();\n            }\n            // clear the reference to the audiocontext\n            this.ac = null;\n            // clear the actual audiocontext, either passed as param or the\n            // global singleton\n            if (!this.params.audioContext) {\n                window.WaveSurferAudioContext = null;\n            } else {\n                this.params.audioContext = null;\n            }\n            // clear the offlineAudioContext\n            window.WaveSurferOfflineAudioContext = null;\n        }\n    }\n\n    /**\n     * Loaded a decoded audio buffer\n     *\n     * @param {Object} buffer Decoded audio buffer to load\n     */\n    load(buffer) {\n        this.startPosition = 0;\n        this.lastPlay = this.ac.currentTime;\n        this.buffer = buffer;\n        this.createSource();\n    }\n\n    /** @private */\n    createSource() {\n        this.disconnectSource();\n        this.source = this.ac.createBufferSource();\n\n        // adjust for old browsers\n        this.source.start = this.source.start || this.source.noteGrainOn;\n        this.source.stop = this.source.stop || this.source.noteOff;\n\n        this.source.playbackRate.setValueAtTime(\n            this.playbackRate,\n            this.ac.currentTime\n        );\n        this.source.buffer = this.buffer;\n        this.source.connect(this.analyser);\n    }\n\n    /**\n     * Used by `wavesurfer.isPlaying()` and `wavesurfer.playPause()`\n     *\n     * @return {boolean} Whether or not this backend is currently paused\n     */\n    isPaused() {\n        return this.state !== this.states[PLAYING];\n    }\n\n    /**\n     * Used by `wavesurfer.getDuration()`\n     *\n     * @return {number} Duration of loaded buffer\n     */\n    getDuration() {\n        if (this.explicitDuration) {\n            return this.explicitDuration;\n        }\n        if (!this.buffer) {\n            return 0;\n        }\n        return this.buffer.duration;\n    }\n\n    /**\n     * Used by `wavesurfer.seekTo()`\n     *\n     * @param {number} start Position to start at in seconds\n     * @param {number} end Position to end at in seconds\n     * @return {{start: number, end: number}} Object containing start and end\n     * positions\n     */\n    seekTo(start, end) {\n        if (!this.buffer) {\n            return;\n        }\n\n        this.scheduledPause = null;\n\n        if (start == null) {\n            start = this.getCurrentTime();\n            if (start >= this.getDuration()) {\n                start = 0;\n            }\n        }\n        if (end == null) {\n            end = this.getDuration();\n        }\n\n        this.startPosition = start;\n        this.lastPlay = this.ac.currentTime;\n\n        if (this.state === this.states[FINISHED]) {\n            this.setState(PAUSED);\n        }\n\n        return {\n            start: start,\n            end: end\n        };\n    }\n\n    /**\n     * Get the playback position in seconds\n     *\n     * @return {number} The playback position in seconds\n     */\n    getPlayedTime() {\n        return (this.ac.currentTime - this.lastPlay) * this.playbackRate;\n    }\n\n    /**\n     * Plays the loaded audio region.\n     *\n     * @param {number} start Start offset in seconds, relative to the beginning\n     * of a clip.\n     * @param {number} end When to stop relative to the beginning of a clip.\n     */\n    play(start, end) {\n        if (!this.buffer) {\n            return;\n        }\n\n        // need to re-create source on each playback\n        this.createSource();\n\n        const adjustedTime = this.seekTo(start, end);\n\n        start = adjustedTime.start;\n        end = adjustedTime.end;\n\n        this.scheduledPause = end;\n\n        this.source.start(0, start, end - start);\n\n        if (this.ac.state == 'suspended') {\n            this.ac.resume && this.ac.resume();\n        }\n\n        this.setState(PLAYING);\n\n        this.fireEvent('play');\n    }\n\n    /**\n     * Pauses the loaded audio.\n     */\n    pause() {\n        this.scheduledPause = null;\n\n        this.startPosition += this.getPlayedTime();\n        this.source && this.source.stop(0);\n\n        this.setState(PAUSED);\n\n        this.fireEvent('pause');\n    }\n\n    /**\n     * Returns the current time in seconds relative to the audio-clip's\n     * duration.\n     *\n     * @return {number} The current time in seconds\n     */\n    getCurrentTime() {\n        return this.state.getCurrentTime.call(this);\n    }\n\n    /**\n     * Returns the current playback rate. (0=no playback, 1=normal playback)\n     *\n     * @return {number} The current playback rate\n     */\n    getPlaybackRate() {\n        return this.playbackRate;\n    }\n\n    /**\n     * Set the audio source playback rate.\n     *\n     * @param {number} value The playback rate to use\n     */\n    setPlaybackRate(value) {\n        value = value || 1;\n        if (this.isPaused()) {\n            this.playbackRate = value;\n        } else {\n            this.pause();\n            this.playbackRate = value;\n            this.play();\n        }\n    }\n}\n","import WebAudio from './webaudio';\nimport * as util from './util';\n\n/**\n * MediaElement backend\n */\nexport default class MediaElement extends WebAudio {\n    /**\n     * Construct the backend\n     *\n     * @param {WavesurferParams} params Wavesurfer parameters\n     */\n    constructor(params) {\n        super(params);\n        /** @private */\n        this.params = params;\n\n        /**\n         * Initially a dummy media element to catch errors. Once `_load` is\n         * called, this will contain the actual `HTMLMediaElement`.\n         * @private\n         */\n        this.media = {\n            currentTime: 0,\n            duration: 0,\n            paused: true,\n            playbackRate: 1,\n            play() {},\n            pause() {},\n            volume: 0\n        };\n\n        /** @private */\n        this.mediaType = params.mediaType.toLowerCase();\n        /** @private */\n        this.elementPosition = params.elementPosition;\n        /** @private */\n        this.peaks = null;\n        /** @private */\n        this.playbackRate = 1;\n        /** @private */\n        this.volume = 1;\n        /** @private */\n        this.isMuted = false;\n        /** @private */\n        this.buffer = null;\n        /** @private */\n        this.onPlayEnd = null;\n        /** @private */\n        this.mediaListeners = {};\n    }\n\n    /**\n     * Initialise the backend, called in `wavesurfer.createBackend()`\n     */\n    init() {\n        this.setPlaybackRate(this.params.audioRate);\n        this.createTimer();\n    }\n\n    /**\n     * Attach event listeners to media element.\n     */\n    _setupMediaListeners() {\n        this.mediaListeners.error = () => {\n            this.fireEvent('error', 'Error loading media element');\n        };\n        this.mediaListeners.canplay = () => {\n            this.fireEvent('canplay');\n        };\n        this.mediaListeners.ended = () => {\n            this.fireEvent('finish');\n        };\n        // listen to and relay play, pause and seeked events to enable\n        // playback control from the external media element\n        this.mediaListeners.play = () => {\n            this.fireEvent('play');\n        };\n        this.mediaListeners.pause = () => {\n            this.fireEvent('pause');\n        };\n        this.mediaListeners.seeked = event => {\n            this.fireEvent('seek');\n        };\n        this.mediaListeners.volumechange = event => {\n            this.isMuted = this.media.muted;\n            if (this.isMuted) {\n                this.volume = 0;\n            } else {\n                this.volume = this.media.volume;\n            }\n            this.fireEvent('volume');\n        };\n\n        // reset event listeners\n        Object.keys(this.mediaListeners).forEach(id => {\n            this.media.removeEventListener(id, this.mediaListeners[id]);\n            this.media.addEventListener(id, this.mediaListeners[id]);\n        });\n    }\n\n    /**\n     * Create a timer to provide a more precise `audioprocess` event.\n     */\n    createTimer() {\n        const onAudioProcess = () => {\n            if (this.isPaused()) {\n                return;\n            }\n            this.fireEvent('audioprocess', this.getCurrentTime());\n\n            // Call again in the next frame\n            util.frame(onAudioProcess)();\n        };\n\n        this.on('play', onAudioProcess);\n\n        // Update the progress one more time to prevent it from being stuck in\n        // case of lower framerates\n        this.on('pause', () => {\n            this.fireEvent('audioprocess', this.getCurrentTime());\n        });\n    }\n\n    /**\n     * Create media element with url as its source,\n     * and append to container element.\n     *\n     * @param {string} url Path to media file\n     * @param {HTMLElement} container HTML element\n     * @param {number[]|Number.<Array[]>} peaks Array of peak data\n     * @param {string} preload HTML 5 preload attribute value\n     * @throws Will throw an error if the `url` argument is not a valid media\n     * element.\n     */\n    load(url, container, peaks, preload) {\n        const media = document.createElement(this.mediaType);\n        media.controls = this.params.mediaControls;\n        media.autoplay = this.params.autoplay || false;\n        media.preload = preload == null ? 'auto' : preload;\n        media.src = url;\n        media.style.width = '100%';\n\n        const prevMedia = container.querySelector(this.mediaType);\n        if (prevMedia) {\n            container.removeChild(prevMedia);\n        }\n        container.appendChild(media);\n\n        this._load(media, peaks);\n    }\n\n    /**\n     * Load existing media element.\n     *\n     * @param {HTMLMediaElement} elt HTML5 Audio or Video element\n     * @param {number[]|Number.<Array[]>} peaks Array of peak data\n     */\n    loadElt(elt, peaks) {\n        elt.controls = this.params.mediaControls;\n        elt.autoplay = this.params.autoplay || false;\n\n        this._load(elt, peaks);\n    }\n\n    /**\n     * Method called by both `load` (from url)\n     * and `loadElt` (existing media element) methods.\n     *\n     * @param {HTMLMediaElement} media HTML5 Audio or Video element\n     * @param {number[]|Number.<Array[]>} peaks Array of peak data\n     * @throws Will throw an error if the `media` argument is not a valid media\n     * element.\n     * @private\n     */\n    _load(media, peaks) {\n        // verify media element is valid\n        if (\n            !(media instanceof HTMLMediaElement) ||\n            typeof media.addEventListener === 'undefined'\n        ) {\n            throw new Error('media parameter is not a valid media element');\n        }\n\n        // load must be called manually on iOS, otherwise peaks won't draw\n        // until a user interaction triggers load --> 'ready' event\n        if (typeof media.load == 'function') {\n            // Resets the media element and restarts the media resource. Any\n            // pending events are discarded. How much media data is fetched is\n            // still affected by the preload attribute.\n            media.load();\n        }\n\n        this.media = media;\n        this._setupMediaListeners();\n        this.peaks = peaks;\n        this.onPlayEnd = null;\n        this.buffer = null;\n        this.isMuted = media.muted;\n        this.setPlaybackRate(this.playbackRate);\n        this.setVolume(this.volume);\n    }\n\n    /**\n     * Used by `wavesurfer.isPlaying()` and `wavesurfer.playPause()`\n     *\n     * @return {boolean} Media paused or not\n     */\n    isPaused() {\n        return !this.media || this.media.paused;\n    }\n\n    /**\n     * Used by `wavesurfer.getDuration()`\n     *\n     * @return {number} Duration\n     */\n    getDuration() {\n        if (this.explicitDuration) {\n            return this.explicitDuration;\n        }\n        let duration = (this.buffer || this.media).duration;\n        if (duration >= Infinity) {\n            // streaming audio\n            duration = this.media.seekable.end(0);\n        }\n        return duration;\n    }\n\n    /**\n     * Returns the current time in seconds relative to the audio-clip's\n     * duration.\n     *\n     * @return {number} Current time\n     */\n    getCurrentTime() {\n        return this.media && this.media.currentTime;\n    }\n\n    /**\n     * Get the position from 0 to 1\n     *\n     * @return {number} Current position\n     */\n    getPlayedPercents() {\n        return this.getCurrentTime() / this.getDuration() || 0;\n    }\n\n    /**\n     * Get the audio source playback rate.\n     *\n     * @return {number} Playback rate\n     */\n    getPlaybackRate() {\n        return this.playbackRate || this.media.playbackRate;\n    }\n\n    /**\n     * Set the audio source playback rate.\n     *\n     * @param {number} value Playback rate\n     */\n    setPlaybackRate(value) {\n        this.playbackRate = value || 1;\n        this.media.playbackRate = this.playbackRate;\n    }\n\n    /**\n     * Used by `wavesurfer.seekTo()`\n     *\n     * @param {number} start Position to start at in seconds\n     */\n    seekTo(start) {\n        if (start != null) {\n            this.media.currentTime = start;\n        }\n        this.clearPlayEnd();\n    }\n\n    /**\n     * Plays the loaded audio region.\n     *\n     * @param {number} start Start offset in seconds, relative to the beginning\n     * of a clip.\n     * @param {number} end When to stop, relative to the beginning of a clip.\n     * @emits MediaElement#play\n     * @return {Promise} Result\n     */\n    play(start, end) {\n        this.seekTo(start);\n        const promise = this.media.play();\n        end && this.setPlayEnd(end);\n\n        return promise;\n    }\n\n    /**\n     * Pauses the loaded audio.\n     *\n     * @emits MediaElement#pause\n     * @return {Promise} Result\n     */\n    pause() {\n        let promise;\n\n        if (this.media) {\n            promise = this.media.pause();\n        }\n        this.clearPlayEnd();\n\n        return promise;\n    }\n\n    /**\n     * Set the play end\n     *\n     * @private\n     * @param {number} end Where to end\n     */\n    setPlayEnd(end) {\n        this._onPlayEnd = time => {\n            if (time >= end) {\n                this.pause();\n                this.seekTo(end);\n            }\n        };\n        this.on('audioprocess', this._onPlayEnd);\n    }\n\n    /** @private */\n    clearPlayEnd() {\n        if (this._onPlayEnd) {\n            this.un('audioprocess', this._onPlayEnd);\n            this._onPlayEnd = null;\n        }\n    }\n\n    /**\n     * Compute the max and min value of the waveform when broken into\n     * <length> subranges.\n     *\n     * @param {number} length How many subranges to break the waveform into.\n     * @param {number} first First sample in the required range.\n     * @param {number} last Last sample in the required range.\n     * @return {number[]|Number.<Array[]>} Array of 2*<length> peaks or array of\n     * arrays of peaks consisting of (max, min) values for each subrange.\n     */\n    getPeaks(length, first, last) {\n        if (this.buffer) {\n            return super.getPeaks(length, first, last);\n        }\n        return this.peaks || [];\n    }\n\n    /**\n     * Set the sink id for the media player\n     *\n     * @param {string} deviceId String value representing audio device id.\n     * @returns {Promise} A Promise that resolves to `undefined` when there\n     * are no errors.\n     */\n    setSinkId(deviceId) {\n        if (deviceId) {\n            if (!this.media.setSinkId) {\n                return Promise.reject(\n                    new Error('setSinkId is not supported in your browser')\n                );\n            }\n            return this.media.setSinkId(deviceId);\n        }\n\n        return Promise.reject(new Error('Invalid deviceId: ' + deviceId));\n    }\n\n    /**\n     * Get the current volume\n     *\n     * @return {number} value A floating point value between 0 and 1.\n     */\n    getVolume() {\n        return this.volume;\n    }\n\n    /**\n     * Set the audio volume\n     *\n     * @param {number} value A floating point value between 0 and 1.\n     */\n    setVolume(value) {\n        this.volume = value;\n        // no need to change when it's already at that volume\n        if (this.media.volume !== this.volume) {\n            this.media.volume = this.volume;\n        }\n    }\n\n    /**\n     * This is called when wavesurfer is destroyed\n     *\n     */\n    destroy() {\n        this.pause();\n        this.unAll();\n        this.destroyed = true;\n\n        // cleanup media event listeners\n        Object.keys(this.mediaListeners).forEach(id => {\n            if (this.media) {\n                this.media.removeEventListener(id, this.mediaListeners[id]);\n            }\n        });\n\n        if (\n            this.params.removeMediaElementOnDestroy &&\n            this.media &&\n            this.media.parentNode\n        ) {\n            this.media.parentNode.removeChild(this.media);\n        }\n\n        this.media = null;\n    }\n}\n","import * as util from './util';\nimport MultiCanvas from './drawer.multicanvas';\nimport WebAudio from './webaudio';\nimport MediaElement from './mediaelement';\nimport PeakCache from './peakcache';\nimport MediaElementWebAudio from './mediaelement-webaudio';\n\n/*\n * This work is licensed under a BSD-3-Clause License.\n */\n\n/** @external {HTMLElement} https://developer.mozilla.org/en/docs/Web/API/HTMLElement */\n/** @external {OfflineAudioContext} https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext */\n/** @external {File} https://developer.mozilla.org/en-US/docs/Web/API/File */\n/** @external {Blob} https://developer.mozilla.org/en-US/docs/Web/API/Blob */\n/** @external {CanvasRenderingContext2D} https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D */\n/** @external {MediaStreamConstraints} https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamConstraints */\n/** @external {AudioNode} https://developer.mozilla.org/de/docs/Web/API/AudioNode */\n\n/**\n * @typedef {Object} WavesurferParams\n * @property {AudioContext} audioContext=null Use your own previously\n * initialized AudioContext or leave blank.\n * @property {number} audioRate=1 Speed at which to play audio. Lower number is\n * slower.\n * @property {ScriptProcessorNode} audioScriptProcessor=null Use your own previously\n * initialized ScriptProcessorNode or leave blank.\n * @property {boolean} autoCenter=true If a scrollbar is present, center the\n * waveform on current progress\n * @property {number} autoCenterRate=5 If autoCenter is active, rate at which the\n * waveform is centered\n * @property {boolean} autoCenterImmediately=false If autoCenter is active, immediately\n * center waveform on current progress\n * @property {string} backend='WebAudio' `'WebAudio'|'MediaElement'|'MediaElementWebAudio'` In most cases\n * you don't have to set this manually. MediaElement is a fallback for unsupported browsers.\n * MediaElementWebAudio allows to use WebAudio API also with big audio files, loading audio like with\n * MediaElement backend (HTML5 audio tag). You have to use the same methods of MediaElement backend for loading and\n * playback, giving also peaks, so the audio data are not decoded. In this way you can use WebAudio features, like filters,\n * also with audio with big duration. For example:\n * ` wavesurfer.load(url | HTMLMediaElement, peaks, preload, duration);\n *   wavesurfer.play();\n *   wavesurfer.setFilter(customFilter);\n * `\n * @property {string} backgroundColor=null Change background color of the\n * waveform container.\n * @property {number} barHeight=1 The height of the wave bars.\n * @property {number} barRadius=0 The radius of the wave bars. Makes bars rounded\n * @property {number} barGap=null The optional spacing between bars of the wave,\n * if not provided will be calculated in legacy format.\n * @property {number} barWidth=null Draw the waveform using bars.\n * @property {boolean} closeAudioContext=false Close and nullify all audio\n * contexts when the destroy method is called.\n * @property {!string|HTMLElement} container CSS selector or HTML element where\n * the waveform should be drawn. This is the only required parameter.\n * @property {string} cursorColor='#333' The fill color of the cursor indicating\n * the playhead position.\n * @property {number} cursorWidth=1 Measured in pixels.\n * @property {number} duration=null Optional audio length so pre-rendered peaks\n * can be display immediately for example.\n * @property {boolean} fillParent=true Whether to fill the entire container or\n * draw only according to `minPxPerSec`.\n * @property {boolean} forceDecode=false Force decoding of audio using web audio\n * when zooming to get a more detailed waveform.\n * @property {number} height=128 The height of the waveform. Measured in\n * pixels.\n * @property {boolean} hideScrollbar=false Whether to hide the horizontal\n * scrollbar when one would normally be shown.\n * @property {boolean} interact=true Whether the mouse interaction will be\n * enabled at initialization. You can switch this parameter at any time later\n * on.\n * @property {boolean} loopSelection=true (Use with regions plugin) Enable\n * looping of selected regions\n * @property {number} maxCanvasWidth=4000 Maximum width of a single canvas in\n * pixels, excluding a small overlap (2 * `pixelRatio`, rounded up to the next\n * even integer). If the waveform is longer than this value, additional canvases\n * will be used to render the waveform, which is useful for very large waveforms\n * that may be too wide for browsers to draw on a single canvas.\n * @property {boolean} mediaControls=false (Use with backend `MediaElement` or `MediaElementWebAudio`)\n * this enables the native controls for the media element\n * @property {string} mediaType='audio' (Use with backend `MediaElement` or `MediaElementWebAudio`)\n * `'audio'|'video'` ('video' only for `MediaElement`)\n * @property {number} minPxPerSec=20 Minimum number of pixels per second of\n * audio.\n * @property {boolean} normalize=false If true, normalize by the maximum peak\n * instead of 1.0.\n * @property {boolean} partialRender=false Use the PeakCache to improve\n * rendering speed of large waveforms\n * @property {number} pixelRatio=window.devicePixelRatio The pixel ratio used to\n * calculate display\n * @property {PluginDefinition[]} plugins=[] An array of plugin definitions to\n * register during instantiation, they will be directly initialised unless they\n * are added with the `deferInit` property set to true.\n * @property {string} progressColor='#555' The fill color of the part of the\n * waveform behind the cursor. When `progressColor` and `waveColor` are the same\n * the progress wave is not rendered at all.\n * @property {boolean} removeMediaElementOnDestroy=true Set to false to keep the\n * media element in the DOM when the player is destroyed. This is useful when\n * reusing an existing media element via the `loadMediaElement` method.\n * @property {Object} renderer=MultiCanvas Can be used to inject a custom\n * renderer.\n * @property {boolean|number} responsive=false If set to `true` resize the\n * waveform, when the window is resized. This is debounced with a `100ms`\n * timeout by default. If this parameter is a number it represents that timeout.\n * @property {boolean} rtl=false If set to `true`, renders waveform from\n * right-to-left.\n * @property {boolean} scrollParent=false Whether to scroll the container with a\n * lengthy waveform. Otherwise the waveform is shrunk to the container width\n * (see fillParent).\n * @property {number} skipLength=2 Number of seconds to skip with the\n * skipForward() and skipBackward() methods.\n * @property {boolean} splitChannels=false Render with separate waveforms for\n * the channels of the audio\n * @property {string} waveColor='#999' The fill color of the waveform after the\n * cursor.\n * @property {object} xhr={} XHR options. For example:\n * `let xhr = {\n *     cache: 'default',\n *     mode: 'cors',\n *     method: 'GET',\n *     credentials: 'same-origin',\n *     redirect: 'follow',\n *     referrer: 'client',\n *     headers: [\n *         {\n *             key: 'Authorization',\n *             value: 'my-token'\n *         }\n *     ]\n * };`\n */\n\n/**\n * @typedef {Object} PluginDefinition\n * @desc The Object used to describe a plugin\n * @example wavesurfer.addPlugin(pluginDefinition);\n * @property {string} name The name of the plugin, the plugin instance will be\n * added as a property to the wavesurfer instance under this name\n * @property {?Object} staticProps The properties that should be added to the\n * wavesurfer instance as static properties\n * @property {?boolean} deferInit Don't initialise plugin\n * automatically\n * @property {Object} params={} The plugin parameters, they are the first parameter\n * passed to the plugin class constructor function\n * @property {PluginClass} instance The plugin instance factory, is called with\n * the dependency specified in extends. Returns the plugin class.\n */\n\n/**\n * @interface PluginClass\n *\n * @desc This is the interface which is implemented by all plugin classes. Note\n * that this only turns into an observer after being passed through\n * `wavesurfer.addPlugin`.\n *\n * @extends {Observer}\n */\nclass PluginClass {\n    /**\n     * Plugin definition factory\n     *\n     * This function must be used to create a plugin definition which can be\n     * used by wavesurfer to correctly instantiate the plugin.\n     *\n     * It returns a `PluginDefinition` object representing the plugin.\n     *\n     * @param {Object} params={} The plugin params (specific to the plugin)\n     */\n    create(params) {}\n    /**\n     * Construct the plugin\n     *\n     * @param {Object} params={} The plugin params (specific to the plugin)\n     * @param {Object} ws The wavesurfer instance\n     */\n    constructor(params, ws) {}\n    /**\n     * Initialise the plugin\n     *\n     * Start doing something. This is called by\n     * `wavesurfer.initPlugin(pluginName)`\n     */\n    init() {}\n    /**\n     * Destroy the plugin instance\n     *\n     * Stop doing something. This is called by\n     * `wavesurfer.destroyPlugin(pluginName)`\n     */\n    destroy() {}\n}\n\n/**\n * WaveSurfer core library class\n *\n * @extends {Observer}\n * @example\n * const params = {\n *   container: '#waveform',\n *   waveColor: 'violet',\n *   progressColor: 'purple'\n * };\n *\n * // initialise like this\n * const wavesurfer = WaveSurfer.create(params);\n *\n * // or like this ...\n * const wavesurfer = new WaveSurfer(params);\n * wavesurfer.init();\n *\n * // load audio file\n * wavesurfer.load('example/media/demo.wav');\n */\nexport default class WaveSurfer extends util.Observer {\n    /** @private */\n    defaultParams = {\n        audioContext: null,\n        audioScriptProcessor: null,\n        audioRate: 1,\n        autoCenter: true,\n        autoCenterRate: 5,\n        autoCenterImmediately: false,\n        backend: 'WebAudio',\n        backgroundColor: null,\n        barHeight: 1,\n        barRadius: 0,\n        barGap: null,\n        container: null,\n        cursorColor: '#333',\n        cursorWidth: 1,\n        dragSelection: true,\n        duration: null,\n        fillParent: true,\n        forceDecode: false,\n        height: 128,\n        hideScrollbar: false,\n        interact: true,\n        loopSelection: true,\n        maxCanvasWidth: 4000,\n        mediaContainer: null,\n        mediaControls: false,\n        mediaType: 'audio',\n        minPxPerSec: 20,\n        normalize: false,\n        partialRender: false,\n        pixelRatio:\n            window.devicePixelRatio || screen.deviceXDPI / screen.logicalXDPI,\n        plugins: [],\n        progressColor: '#555',\n        removeMediaElementOnDestroy: true,\n        renderer: MultiCanvas,\n        responsive: false,\n        rtl: false,\n        scrollParent: false,\n        skipLength: 2,\n        splitChannels: false,\n        waveColor: '#999',\n        xhr: {}\n    };\n\n    /** @private */\n    backends = {\n        MediaElement,\n        WebAudio,\n        MediaElementWebAudio\n    };\n\n    /**\n     * Instantiate this class, call its `init` function and returns it\n     *\n     * @param {WavesurferParams} params The wavesurfer parameters\n     * @return {Object} WaveSurfer instance\n     * @example const wavesurfer = WaveSurfer.create(params);\n     */\n    static create(params) {\n        const wavesurfer = new WaveSurfer(params);\n        return wavesurfer.init();\n    }\n\n    /**\n     * The library version number is available as a static property of the\n     * WaveSurfer class\n     *\n     * @type {String}\n     * @example\n     * console.log('Using wavesurfer.js ' + WaveSurfer.VERSION);\n     */\n    static VERSION = __VERSION__;\n\n    /**\n     * Functions in the `util` property are available as a prototype property to\n     * all instances\n     *\n     * @type {Object}\n     * @example\n     * const wavesurfer = WaveSurfer.create(params);\n     * wavesurfer.util.style(myElement, { background: 'blue' });\n     */\n    util = util;\n\n    /**\n     * Functions in the `util` property are available as a static property of the\n     * WaveSurfer class\n     *\n     * @type {Object}\n     * @example\n     * WaveSurfer.util.style(myElement, { background: 'blue' });\n     */\n    static util = util;\n\n    /**\n     * Initialise wavesurfer instance\n     *\n     * @param {WavesurferParams} params Instantiation options for wavesurfer\n     * @example\n     * const wavesurfer = new WaveSurfer(params);\n     * @returns {this} Wavesurfer instance\n     */\n    constructor(params) {\n        super();\n        /**\n         * Extract relevant parameters (or defaults)\n         * @private\n         */\n        this.params = util.extend({}, this.defaultParams, params);\n\n        /** @private */\n        this.container =\n            'string' == typeof params.container\n                ? document.querySelector(this.params.container)\n                : this.params.container;\n\n        if (!this.container) {\n            throw new Error('Container element not found');\n        }\n\n        if (this.params.mediaContainer == null) {\n            /** @private */\n            this.mediaContainer = this.container;\n        } else if (typeof this.params.mediaContainer == 'string') {\n            /** @private */\n            this.mediaContainer = document.querySelector(\n                this.params.mediaContainer\n            );\n        } else {\n            /** @private */\n            this.mediaContainer = this.params.mediaContainer;\n        }\n\n        if (!this.mediaContainer) {\n            throw new Error('Media Container element not found');\n        }\n\n        if (this.params.maxCanvasWidth <= 1) {\n            throw new Error('maxCanvasWidth must be greater than 1');\n        } else if (this.params.maxCanvasWidth % 2 == 1) {\n            throw new Error('maxCanvasWidth must be an even number');\n        }\n\n        if (this.params.rtl === true) {\n            util.style(this.container, { transform: 'rotateY(180deg)' });\n        }\n\n        if (this.params.backgroundColor) {\n            this.setBackgroundColor(this.params.backgroundColor);\n        }\n\n        /**\n         * @private Used to save the current volume when muting so we can\n         * restore once unmuted\n         * @type {number}\n         */\n        this.savedVolume = 0;\n\n        /**\n         * @private The current muted state\n         * @type {boolean}\n         */\n        this.isMuted = false;\n\n        /**\n         * @private Will hold a list of event descriptors that need to be\n         * canceled on subsequent loads of audio\n         * @type {Object[]}\n         */\n        this.tmpEvents = [];\n\n        /**\n         * @private Holds any running audio downloads\n         * @type {Observer}\n         */\n        this.currentRequest = null;\n        /** @private */\n        this.arraybuffer = null;\n        /** @private */\n        this.drawer = null;\n        /** @private */\n        this.backend = null;\n        /** @private */\n        this.peakCache = null;\n\n        // cache constructor objects\n        if (typeof this.params.renderer !== 'function') {\n            throw new Error('Renderer parameter is invalid');\n        }\n        /**\n         * @private The uninitialised Drawer class\n         */\n        this.Drawer = this.params.renderer;\n        /**\n         * @private The uninitialised Backend class\n         */\n        // Back compat\n        if (this.params.backend == 'AudioElement') {\n            this.params.backend = 'MediaElement';\n        }\n\n        if (\n            (this.params.backend == 'WebAudio' ||\n                this.params.backend === 'MediaElementWebAudio') &&\n            !WebAudio.prototype.supportsWebAudio.call(null)\n        ) {\n            this.params.backend = 'MediaElement';\n        }\n        this.Backend = this.backends[this.params.backend];\n\n        /**\n         * @private map of plugin names that are currently initialised\n         */\n        this.initialisedPluginList = {};\n        /** @private */\n        this.isDestroyed = false;\n\n        /**\n         * Get the current ready status.\n         *\n         * @example const isReady = wavesurfer.isReady;\n         * @return {boolean}\n         */\n        this.isReady = false;\n\n        // responsive debounced event listener. If this.params.responsive is not\n        // set, this is never called. Use 100ms or this.params.responsive as\n        // timeout for the debounce function.\n        let prevWidth = 0;\n        this._onResize = util.debounce(\n            () => {\n                if (\n                    prevWidth != this.drawer.wrapper.clientWidth &&\n                    !this.params.scrollParent\n                ) {\n                    prevWidth = this.drawer.wrapper.clientWidth;\n                    this.drawer.fireEvent('redraw');\n                }\n            },\n            typeof this.params.responsive === 'number'\n                ? this.params.responsive\n                : 100\n        );\n\n        return this;\n    }\n\n    /**\n     * Initialise the wave\n     *\n     * @example\n     * var wavesurfer = new WaveSurfer(params);\n     * wavesurfer.init();\n     * @return {this} The wavesurfer instance\n     */\n    init() {\n        this.registerPlugins(this.params.plugins);\n        this.createDrawer();\n        this.createBackend();\n        this.createPeakCache();\n        return this;\n    }\n\n    /**\n     * Add and initialise array of plugins (if `plugin.deferInit` is falsey),\n     * this function is called in the init function of wavesurfer\n     *\n     * @param {PluginDefinition[]} plugins An array of plugin definitions\n     * @emits {WaveSurfer#plugins-registered} Called with the array of plugin definitions\n     * @return {this} The wavesurfer instance\n     */\n    registerPlugins(plugins) {\n        // first instantiate all the plugins\n        plugins.forEach(plugin => this.addPlugin(plugin));\n\n        // now run the init functions\n        plugins.forEach(plugin => {\n            // call init function of the plugin if deferInit is falsey\n            // in that case you would manually use initPlugins()\n            if (!plugin.deferInit) {\n                this.initPlugin(plugin.name);\n            }\n        });\n        this.fireEvent('plugins-registered', plugins);\n        return this;\n    }\n\n    /**\n     * Get a map of plugin names that are currently initialised\n     *\n     * @example wavesurfer.getPlugins();\n     * @return {Object} Object with plugin names\n     */\n    getActivePlugins() {\n        return this.initialisedPluginList;\n    }\n\n    /**\n     * Add a plugin object to wavesurfer\n     *\n     * @param {PluginDefinition} plugin A plugin definition\n     * @emits {WaveSurfer#plugin-added} Called with the name of the plugin that was added\n     * @example wavesurfer.addPlugin(WaveSurfer.minimap());\n     * @return {this} The wavesurfer instance\n     */\n    addPlugin(plugin) {\n        if (!plugin.name) {\n            throw new Error('Plugin does not have a name!');\n        }\n        if (!plugin.instance) {\n            throw new Error(\n                `Plugin ${plugin.name} does not have an instance property!`\n            );\n        }\n\n        // staticProps properties are applied to wavesurfer instance\n        if (plugin.staticProps) {\n            Object.keys(plugin.staticProps).forEach(pluginStaticProp => {\n                /**\n                 * Properties defined in a plugin definition's `staticProps` property are added as\n                 * staticProps properties of the WaveSurfer instance\n                 */\n                this[pluginStaticProp] = plugin.staticProps[pluginStaticProp];\n            });\n        }\n\n        const Instance = plugin.instance;\n\n        // turn the plugin instance into an observer\n        const observerPrototypeKeys = Object.getOwnPropertyNames(\n            util.Observer.prototype\n        );\n        observerPrototypeKeys.forEach(key => {\n            Instance.prototype[key] = util.Observer.prototype[key];\n        });\n\n        /**\n         * Instantiated plugin classes are added as a property of the wavesurfer\n         * instance\n         * @type {Object}\n         */\n        this[plugin.name] = new Instance(plugin.params || {}, this);\n        this.fireEvent('plugin-added', plugin.name);\n        return this;\n    }\n\n    /**\n     * Initialise a plugin\n     *\n     * @param {string} name A plugin name\n     * @emits WaveSurfer#plugin-initialised\n     * @example wavesurfer.initPlugin('minimap');\n     * @return {this} The wavesurfer instance\n     */\n    initPlugin(name) {\n        if (!this[name]) {\n            throw new Error(`Plugin ${name} has not been added yet!`);\n        }\n        if (this.initialisedPluginList[name]) {\n            // destroy any already initialised plugins\n            this.destroyPlugin(name);\n        }\n        this[name].init();\n        this.initialisedPluginList[name] = true;\n        this.fireEvent('plugin-initialised', name);\n        return this;\n    }\n\n    /**\n     * Destroy a plugin\n     *\n     * @param {string} name A plugin name\n     * @emits WaveSurfer#plugin-destroyed\n     * @example wavesurfer.destroyPlugin('minimap');\n     * @returns {this} The wavesurfer instance\n     */\n    destroyPlugin(name) {\n        if (!this[name]) {\n            throw new Error(\n                `Plugin ${name} has not been added yet and cannot be destroyed!`\n            );\n        }\n        if (!this.initialisedPluginList[name]) {\n            throw new Error(\n                `Plugin ${name} is not active and cannot be destroyed!`\n            );\n        }\n        if (typeof this[name].destroy !== 'function') {\n            throw new Error(`Plugin ${name} does not have a destroy function!`);\n        }\n\n        this[name].destroy();\n        delete this.initialisedPluginList[name];\n        this.fireEvent('plugin-destroyed', name);\n        return this;\n    }\n\n    /**\n     * Destroy all initialised plugins. Convenience function to use when\n     * wavesurfer is removed\n     *\n     * @private\n     */\n    destroyAllPlugins() {\n        Object.keys(this.initialisedPluginList).forEach(name =>\n            this.destroyPlugin(name)\n        );\n    }\n\n    /**\n     * Create the drawer and draw the waveform\n     *\n     * @private\n     * @emits WaveSurfer#drawer-created\n     */\n    createDrawer() {\n        this.drawer = new this.Drawer(this.container, this.params);\n        this.drawer.init();\n        this.fireEvent('drawer-created', this.drawer);\n\n        if (this.params.responsive !== false) {\n            window.addEventListener('resize', this._onResize, true);\n            window.addEventListener('orientationchange', this._onResize, true);\n        }\n\n        this.drawer.on('redraw', () => {\n            this.drawBuffer();\n            this.drawer.progress(this.backend.getPlayedPercents());\n        });\n\n        // Click-to-seek\n        this.drawer.on('click', (e, progress) => {\n            setTimeout(() => this.seekTo(progress), 0);\n        });\n\n        // Relay the scroll event from the drawer\n        this.drawer.on('scroll', e => {\n            if (this.params.partialRender) {\n                this.drawBuffer();\n            }\n            this.fireEvent('scroll', e);\n        });\n    }\n\n    /**\n     * Create the backend\n     *\n     * @private\n     * @emits WaveSurfer#backend-created\n     */\n    createBackend() {\n        if (this.backend) {\n            this.backend.destroy();\n        }\n\n        this.backend = new this.Backend(this.params);\n        this.backend.init();\n        this.fireEvent('backend-created', this.backend);\n\n        this.backend.on('finish', () => {\n            this.drawer.progress(this.backend.getPlayedPercents());\n            this.fireEvent('finish');\n        });\n        this.backend.on('play', () => this.fireEvent('play'));\n        this.backend.on('pause', () => this.fireEvent('pause'));\n\n        this.backend.on('audioprocess', time => {\n            this.drawer.progress(this.backend.getPlayedPercents());\n            this.fireEvent('audioprocess', time);\n        });\n\n        // only needed for MediaElement and MediaElementWebAudio backend\n        if (\n            this.params.backend === 'MediaElement' ||\n            this.params.backend === 'MediaElementWebAudio'\n        ) {\n            this.backend.on('seek', () => {\n                this.drawer.progress(this.backend.getPlayedPercents());\n            });\n\n            this.backend.on('volume', () => {\n                let newVolume = this.getVolume();\n                this.fireEvent('volume', newVolume);\n\n                if (this.backend.isMuted !== this.isMuted) {\n                    this.isMuted = this.backend.isMuted;\n                    this.fireEvent('mute', this.isMuted);\n                }\n            });\n        }\n    }\n\n    /**\n     * Create the peak cache\n     *\n     * @private\n     */\n    createPeakCache() {\n        if (this.params.partialRender) {\n            this.peakCache = new PeakCache();\n        }\n    }\n\n    /**\n     * Get the duration of the audio clip\n     *\n     * @example const duration = wavesurfer.getDuration();\n     * @return {number} Duration in seconds\n     */\n    getDuration() {\n        return this.backend.getDuration();\n    }\n\n    /**\n     * Get the current playback position\n     *\n     * @example const currentTime = wavesurfer.getCurrentTime();\n     * @return {number} Playback position in seconds\n     */\n    getCurrentTime() {\n        return this.backend.getCurrentTime();\n    }\n\n    /**\n     * Set the current play time in seconds.\n     *\n     * @param {number} seconds A positive number in seconds. E.g. 10 means 10\n     * seconds, 60 means 1 minute\n     */\n    setCurrentTime(seconds) {\n        if (seconds >= this.getDuration()) {\n            this.seekTo(1);\n        } else {\n            this.seekTo(seconds / this.getDuration());\n        }\n    }\n\n    /**\n     * Starts playback from the current position. Optional start and end\n     * measured in seconds can be used to set the range of audio to play.\n     *\n     * @param {?number} start Position to start at\n     * @param {?number} end Position to end at\n     * @emits WaveSurfer#interaction\n     * @return {Promise} Result of the backend play method\n     * @example\n     * // play from second 1 to 5\n     * wavesurfer.play(1, 5);\n     */\n    play(start, end) {\n        this.fireEvent('interaction', () => this.play(start, end));\n        return this.backend.play(start, end);\n    }\n\n    /**\n     * Stops and pauses playback\n     *\n     * @example wavesurfer.pause();\n     * @return {Promise} Result of the backend pause method\n     */\n    pause() {\n        if (!this.backend.isPaused()) {\n            return this.backend.pause();\n        }\n    }\n\n    /**\n     * Toggle playback\n     *\n     * @example wavesurfer.playPause();\n     * @return {Promise} Result of the backend play or pause method\n     */\n    playPause() {\n        return this.backend.isPaused() ? this.play() : this.pause();\n    }\n\n    /**\n     * Get the current playback state\n     *\n     * @example const isPlaying = wavesurfer.isPlaying();\n     * @return {boolean} False if paused, true if playing\n     */\n    isPlaying() {\n        return !this.backend.isPaused();\n    }\n\n    /**\n     * Skip backward\n     *\n     * @param {?number} seconds Amount to skip back, if not specified `skipLength`\n     * is used\n     * @example wavesurfer.skipBackward();\n     */\n    skipBackward(seconds) {\n        this.skip(-seconds || -this.params.skipLength);\n    }\n\n    /**\n     * Skip forward\n     *\n     * @param {?number} seconds Amount to skip back, if not specified `skipLength`\n     * is used\n     * @example wavesurfer.skipForward();\n     */\n    skipForward(seconds) {\n        this.skip(seconds || this.params.skipLength);\n    }\n\n    /**\n     * Skip a number of seconds from the current position (use a negative value\n     * to go backwards).\n     *\n     * @param {number} offset Amount to skip back or forwards\n     * @example\n     * // go back 2 seconds\n     * wavesurfer.skip(-2);\n     */\n    skip(offset) {\n        const duration = this.getDuration() || 1;\n        let position = this.getCurrentTime() || 0;\n        position = Math.max(0, Math.min(duration, position + (offset || 0)));\n        this.seekAndCenter(position / duration);\n    }\n\n    /**\n     * Seeks to a position and centers the view\n     *\n     * @param {number} progress Between 0 (=beginning) and 1 (=end)\n     * @example\n     * // seek and go to the middle of the audio\n     * wavesurfer.seekTo(0.5);\n     */\n    seekAndCenter(progress) {\n        this.seekTo(progress);\n        this.drawer.recenter(progress);\n    }\n\n    /**\n     * Seeks to a position\n     *\n     * @param {number} progress Between 0 (=beginning) and 1 (=end)\n     * @emits WaveSurfer#interaction\n     * @emits WaveSurfer#seek\n     * @example\n     * // seek to the middle of the audio\n     * wavesurfer.seekTo(0.5);\n     */\n    seekTo(progress) {\n        // return an error if progress is not a number between 0 and 1\n        if (\n            typeof progress !== 'number' ||\n            !isFinite(progress) ||\n            progress < 0 ||\n            progress > 1\n        ) {\n            throw new Error(\n                'Error calling wavesurfer.seekTo, parameter must be a number between 0 and 1!'\n            );\n        }\n        this.fireEvent('interaction', () => this.seekTo(progress));\n\n        const paused = this.backend.isPaused();\n        // avoid draw wrong position while playing backward seeking\n        if (!paused) {\n            this.backend.pause();\n        }\n        // avoid small scrolls while paused seeking\n        const oldScrollParent = this.params.scrollParent;\n        this.params.scrollParent = false;\n        this.backend.seekTo(progress * this.getDuration());\n        this.drawer.progress(progress);\n\n        if (!paused) {\n            this.backend.play();\n        }\n        this.params.scrollParent = oldScrollParent;\n        this.fireEvent('seek', progress);\n    }\n\n    /**\n     * Stops and goes to the beginning.\n     *\n     * @example wavesurfer.stop();\n     */\n    stop() {\n        this.pause();\n        this.seekTo(0);\n        this.drawer.progress(0);\n    }\n\n    /**\n     * Sets the ID of the audio device to use for output and returns a Promise.\n     *\n     * @param {string} deviceId String value representing underlying output\n     * device\n     * @returns {Promise} `Promise` that resolves to `undefined` when there are\n     * no errors detected.\n     */\n    setSinkId(deviceId) {\n        return this.backend.setSinkId(deviceId);\n    }\n\n    /**\n     * Set the playback volume.\n     *\n     * @param {number} newVolume A value between 0 and 1, 0 being no\n     * volume and 1 being full volume.\n     * @emits WaveSurfer#volume\n     */\n    setVolume(newVolume) {\n        this.backend.setVolume(newVolume);\n        this.fireEvent('volume', newVolume);\n    }\n\n    /**\n     * Get the playback volume.\n     *\n     * @return {number} A value between 0 and 1, 0 being no\n     * volume and 1 being full volume.\n     */\n    getVolume() {\n        return this.backend.getVolume();\n    }\n\n    /**\n     * Set the playback rate.\n     *\n     * @param {number} rate A positive number. E.g. 0.5 means half the normal\n     * speed, 2 means double speed and so on.\n     * @example wavesurfer.setPlaybackRate(2);\n     */\n    setPlaybackRate(rate) {\n        this.backend.setPlaybackRate(rate);\n    }\n\n    /**\n     * Get the playback rate.\n     *\n     * @return {number} The current playback rate.\n     */\n    getPlaybackRate() {\n        return this.backend.getPlaybackRate();\n    }\n\n    /**\n     * Toggle the volume on and off. If not currently muted it will save the\n     * current volume value and turn the volume off. If currently muted then it\n     * will restore the volume to the saved value, and then rest the saved\n     * value.\n     *\n     * @example wavesurfer.toggleMute();\n     */\n    toggleMute() {\n        this.setMute(!this.isMuted);\n    }\n\n    /**\n     * Enable or disable muted audio\n     *\n     * @param {boolean} mute Specify `true` to mute audio.\n     * @emits WaveSurfer#volume\n     * @emits WaveSurfer#mute\n     * @example\n     * // unmute\n     * wavesurfer.setMute(false);\n     * console.log(wavesurfer.getMute()) // logs false\n     */\n    setMute(mute) {\n        // ignore all muting requests if the audio is already in that state\n        if (mute === this.isMuted) {\n            this.fireEvent('mute', this.isMuted);\n            return;\n        }\n\n        if (mute) {\n            // If currently not muted then save current volume,\n            // turn off the volume and update the mute properties\n            this.savedVolume = this.backend.getVolume();\n            this.backend.setVolume(0);\n            this.isMuted = true;\n            this.fireEvent('volume', 0);\n        } else {\n            // If currently muted then restore to the saved volume\n            // and update the mute properties\n            this.backend.setVolume(this.savedVolume);\n            this.isMuted = false;\n            this.fireEvent('volume', this.savedVolume);\n        }\n        this.fireEvent('mute', this.isMuted);\n    }\n\n    /**\n     * Get the current mute status.\n     *\n     * @example const isMuted = wavesurfer.getMute();\n     * @return {boolean} Current mute status\n     */\n    getMute() {\n        return this.isMuted;\n    }\n\n    /**\n     * Get the list of current set filters as an array.\n     *\n     * Filters must be set with setFilters method first\n     *\n     * @return {array} List of enabled filters\n     */\n    getFilters() {\n        return this.backend.filters || [];\n    }\n\n    /**\n     * Toggles `scrollParent` and redraws\n     *\n     * @example wavesurfer.toggleScroll();\n     */\n    toggleScroll() {\n        this.params.scrollParent = !this.params.scrollParent;\n        this.drawBuffer();\n    }\n\n    /**\n     * Toggle mouse interaction\n     *\n     * @example wavesurfer.toggleInteraction();\n     */\n    toggleInteraction() {\n        this.params.interact = !this.params.interact;\n    }\n\n    /**\n     * Get the fill color of the waveform after the cursor.\n     *\n     * @return {string} A CSS color string.\n     */\n    getWaveColor() {\n        return this.params.waveColor;\n    }\n\n    /**\n     * Set the fill color of the waveform after the cursor.\n     *\n     * @param {string} color A CSS color string.\n     * @example wavesurfer.setWaveColor('#ddd');\n     */\n    setWaveColor(color) {\n        this.params.waveColor = color;\n        this.drawBuffer();\n    }\n\n    /**\n     * Get the fill color of the waveform behind the cursor.\n     *\n     * @return {string} A CSS color string.\n     */\n    getProgressColor() {\n        return this.params.progressColor;\n    }\n\n    /**\n     * Set the fill color of the waveform behind the cursor.\n     *\n     * @param {string} color A CSS color string.\n     * @example wavesurfer.setProgressColor('#400');\n     */\n    setProgressColor(color) {\n        this.params.progressColor = color;\n        this.drawBuffer();\n    }\n\n    /**\n     * Get the background color of the waveform container.\n     *\n     * @return {string} A CSS color string.\n     */\n    getBackgroundColor() {\n        return this.params.backgroundColor;\n    }\n\n    /**\n     * Set the background color of the waveform container.\n     *\n     * @param {string} color A CSS color string.\n     * @example wavesurfer.setBackgroundColor('#FF00FF');\n     */\n    setBackgroundColor(color) {\n        this.params.backgroundColor = color;\n        util.style(this.container, { background: this.params.backgroundColor });\n    }\n\n    /**\n     * Get the fill color of the cursor indicating the playhead\n     * position.\n     *\n     * @return {string} A CSS color string.\n     */\n    getCursorColor() {\n        return this.params.cursorColor;\n    }\n\n    /**\n     * Set the fill color of the cursor indicating the playhead\n     * position.\n     *\n     * @param {string} color A CSS color string.\n     * @example wavesurfer.setCursorColor('#222');\n     */\n    setCursorColor(color) {\n        this.params.cursorColor = color;\n        this.drawer.updateCursor();\n    }\n\n    /**\n     * Get the height of the waveform.\n     *\n     * @return {number} Height measured in pixels.\n     */\n    getHeight() {\n        return this.params.height;\n    }\n\n    /**\n     * Set the height of the waveform.\n     *\n     * @param {number} height Height measured in pixels.\n     * @example wavesurfer.setHeight(200);\n     */\n    setHeight(height) {\n        this.params.height = height;\n        this.drawer.setHeight(height * this.params.pixelRatio);\n        this.drawBuffer();\n    }\n\n    /**\n     * Get the correct peaks for current wave view-port and render wave\n     *\n     * @private\n     * @emits WaveSurfer#redraw\n     */\n    drawBuffer() {\n        const nominalWidth = Math.round(\n            this.getDuration() *\n                this.params.minPxPerSec *\n                this.params.pixelRatio\n        );\n        const parentWidth = this.drawer.getWidth();\n        let width = nominalWidth;\n        // always start at 0 after zooming for scrolling : issue redraw left part\n        let start = 0;\n        let end = Math.max(start + parentWidth, width);\n        // Fill container\n        if (\n            this.params.fillParent &&\n            (!this.params.scrollParent || nominalWidth < parentWidth)\n        ) {\n            width = parentWidth;\n            start = 0;\n            end = width;\n        }\n\n        let peaks;\n        if (this.params.partialRender) {\n            const newRanges = this.peakCache.addRangeToPeakCache(\n                width,\n                start,\n                end\n            );\n            let i;\n            for (i = 0; i < newRanges.length; i++) {\n                peaks = this.backend.getPeaks(\n                    width,\n                    newRanges[i][0],\n                    newRanges[i][1]\n                );\n                this.drawer.drawPeaks(\n                    peaks,\n                    width,\n                    newRanges[i][0],\n                    newRanges[i][1]\n                );\n            }\n        } else {\n            peaks = this.backend.getPeaks(width, start, end);\n            this.drawer.drawPeaks(peaks, width, start, end);\n        }\n        this.fireEvent('redraw', peaks, width);\n    }\n\n    /**\n     * Horizontally zooms the waveform in and out. It also changes the parameter\n     * `minPxPerSec` and enables the `scrollParent` option. Calling the function\n     * with a falsey parameter will reset the zoom state.\n     *\n     * @param {?number} pxPerSec Number of horizontal pixels per second of\n     * audio, if none is set the waveform returns to unzoomed state\n     * @emits WaveSurfer#zoom\n     * @example wavesurfer.zoom(20);\n     */\n    zoom(pxPerSec) {\n        if (!pxPerSec) {\n            this.params.minPxPerSec = this.defaultParams.minPxPerSec;\n            this.params.scrollParent = false;\n        } else {\n            this.params.minPxPerSec = pxPerSec;\n            this.params.scrollParent = true;\n        }\n\n        this.drawBuffer();\n        this.drawer.progress(this.backend.getPlayedPercents());\n\n        this.drawer.recenter(this.getCurrentTime() / this.getDuration());\n        this.fireEvent('zoom', pxPerSec);\n    }\n\n    /**\n     * Decode buffer and load\n     *\n     * @private\n     * @param {ArrayBuffer} arraybuffer Buffer to process\n     */\n    loadArrayBuffer(arraybuffer) {\n        this.decodeArrayBuffer(arraybuffer, data => {\n            if (!this.isDestroyed) {\n                this.loadDecodedBuffer(data);\n            }\n        });\n    }\n\n    /**\n     * Directly load an externally decoded AudioBuffer\n     *\n     * @private\n     * @param {AudioBuffer} buffer Buffer to process\n     * @emits WaveSurfer#ready\n     */\n    loadDecodedBuffer(buffer) {\n        this.backend.load(buffer);\n        this.drawBuffer();\n        this.isReady = true;\n        this.fireEvent('ready');\n    }\n\n    /**\n     * Loads audio data from a Blob or File object\n     *\n     * @param {Blob|File} blob Audio data\n     * @example\n     */\n    loadBlob(blob) {\n        // Create file reader\n        const reader = new FileReader();\n        reader.addEventListener('progress', e => this.onProgress(e));\n        reader.addEventListener('load', e =>\n            this.loadArrayBuffer(e.target.result)\n        );\n        reader.addEventListener('error', () =>\n            this.fireEvent('error', 'Error reading file')\n        );\n        reader.readAsArrayBuffer(blob);\n        this.empty();\n    }\n\n    /**\n     * Loads audio and re-renders the waveform.\n     *\n     * @param {string|HTMLMediaElement} url The url of the audio file or the\n     * audio element with the audio\n     * @param {number[]|Number.<Array[]>} peaks Wavesurfer does not have to decode\n     * the audio to render the waveform if this is specified\n     * @param {?string} preload (Use with backend `MediaElement` and `MediaElementWebAudio`)\n     * `'none'|'metadata'|'auto'` Preload attribute for the media element\n     * @param {?number} duration The duration of the audio. This is used to\n     * render the peaks data in the correct size for the audio duration (as\n     * befits the current `minPxPerSec` and zoom value) without having to decode\n     * the audio.\n     * @returns {void}\n     * @throws Will throw an error if the `url` argument is empty.\n     * @example\n     * // uses fetch or media element to load file (depending on backend)\n     * wavesurfer.load('http://example.com/demo.wav');\n     *\n     * // setting preload attribute with media element backend and supplying\n     * // peaks\n     * wavesurfer.load(\n     *   'http://example.com/demo.wav',\n     *   [0.0218, 0.0183, 0.0165, 0.0198, 0.2137, 0.2888],\n     *   true\n     * );\n     */\n    load(url, peaks, preload, duration) {\n        if (!url) {\n            throw new Error('url parameter cannot be empty');\n        }\n        this.empty();\n        if (preload) {\n            // check whether the preload attribute will be usable and if not log\n            // a warning listing the reasons why not and nullify the variable\n            const preloadIgnoreReasons = {\n                \"Preload is not 'auto', 'none' or 'metadata'\":\n                    ['auto', 'metadata', 'none'].indexOf(preload) === -1,\n                'Peaks are not provided': !peaks,\n                \"Backend is not of type 'MediaElement' or 'MediaElementWebAudio'\":\n                    ['MediaElement', 'MediaElementWebAudio'].indexOf(\n                        this.params.backend\n                    ) === -1,\n                'Url is not of type string': typeof url !== 'string'\n            };\n            const activeReasons = Object.keys(preloadIgnoreReasons).filter(\n                reason => preloadIgnoreReasons[reason]\n            );\n            if (activeReasons.length) {\n                // eslint-disable-next-line no-console\n                console.warn(\n                    'Preload parameter of wavesurfer.load will be ignored because:\\n\\t- ' +\n                        activeReasons.join('\\n\\t- ')\n                );\n                // stop invalid values from being used\n                preload = null;\n            }\n        }\n\n        switch (this.params.backend) {\n            case 'WebAudio':\n                return this.loadBuffer(url, peaks, duration);\n            case 'MediaElement':\n            case 'MediaElementWebAudio':\n                return this.loadMediaElement(url, peaks, preload, duration);\n        }\n    }\n\n    /**\n     * Loads audio using Web Audio buffer backend.\n     *\n     * @private\n     * @param {string} url URL of audio file\n     * @param {number[]|Number.<Array[]>} peaks Peaks data\n     * @param {?number} duration Optional duration of audio file\n     * @returns {void}\n     */\n    loadBuffer(url, peaks, duration) {\n        const load = action => {\n            if (action) {\n                this.tmpEvents.push(this.once('ready', action));\n            }\n            return this.getArrayBuffer(url, data => this.loadArrayBuffer(data));\n        };\n\n        if (peaks) {\n            this.backend.setPeaks(peaks, duration);\n            this.drawBuffer();\n            this.tmpEvents.push(this.once('interaction', load));\n        } else {\n            return load();\n        }\n    }\n\n    /**\n     * Either create a media element, or load an existing media element.\n     *\n     * @private\n     * @param {string|HTMLMediaElement} urlOrElt Either a path to a media file, or an\n     * existing HTML5 Audio/Video Element\n     * @param {number[]|Number.<Array[]>} peaks Array of peaks. Required to bypass web audio\n     * dependency\n     * @param {?boolean} preload Set to true if the preload attribute of the\n     * audio element should be enabled\n     * @param {?number} duration Optional duration of audio file\n     */\n    loadMediaElement(urlOrElt, peaks, preload, duration) {\n        let url = urlOrElt;\n\n        if (typeof urlOrElt === 'string') {\n            this.backend.load(url, this.mediaContainer, peaks, preload);\n        } else {\n            const elt = urlOrElt;\n            this.backend.loadElt(elt, peaks);\n\n            // If peaks are not provided,\n            // url = element.src so we can get peaks with web audio\n            url = elt.src;\n        }\n\n        this.tmpEvents.push(\n            this.backend.once('canplay', () => {\n                // ignore when backend was already destroyed\n                if (!this.backend.destroyed) {\n                    this.drawBuffer();\n                    this.isReady = true;\n                    this.fireEvent('ready');\n                }\n            }),\n            this.backend.once('error', err => this.fireEvent('error', err))\n        );\n\n        // If no pre-decoded peaks provided or pre-decoded peaks are\n        // provided with forceDecode flag, attempt to download the\n        // audio file and decode it with Web Audio.\n        if (peaks) {\n            this.backend.setPeaks(peaks, duration);\n        }\n\n        if (\n            (!peaks || this.params.forceDecode) &&\n            this.backend.supportsWebAudio()\n        ) {\n            this.getArrayBuffer(url, arraybuffer => {\n                this.decodeArrayBuffer(arraybuffer, buffer => {\n                    this.backend.buffer = buffer;\n                    this.backend.setPeaks(null);\n                    this.drawBuffer();\n                    this.fireEvent('waveform-ready');\n                });\n            });\n        }\n    }\n\n    /**\n     * Decode an array buffer and pass data to a callback\n     *\n     * @private\n     * @param {Object} arraybuffer The array buffer to decode\n     * @param {function} callback The function to call on complete\n     */\n    decodeArrayBuffer(arraybuffer, callback) {\n        this.arraybuffer = arraybuffer;\n        this.backend.decodeArrayBuffer(\n            arraybuffer,\n            data => {\n                // Only use the decoded data if we haven't been destroyed or\n                // another decode started in the meantime\n                if (!this.isDestroyed && this.arraybuffer == arraybuffer) {\n                    callback(data);\n                    this.arraybuffer = null;\n                }\n            },\n            () => this.fireEvent('error', 'Error decoding audiobuffer')\n        );\n    }\n\n    /**\n     * Load an array buffer using fetch and pass the result to a callback\n     *\n     * @param {string} url The URL of the file object\n     * @param {function} callback The function to call on complete\n     * @returns {util.fetchFile} fetch call\n     * @private\n     */\n    getArrayBuffer(url, callback) {\n        let options = util.extend(\n            {\n                url: url,\n                responseType: 'arraybuffer'\n            },\n            this.params.xhr\n        );\n        const request = util.fetchFile(options);\n\n        this.currentRequest = request;\n\n        this.tmpEvents.push(\n            request.on('progress', e => {\n                this.onProgress(e);\n            }),\n            request.on('success', data => {\n                callback(data);\n                this.currentRequest = null;\n            }),\n            request.on('error', e => {\n                this.fireEvent('error', e);\n                this.currentRequest = null;\n            })\n        );\n\n        return request;\n    }\n\n    /**\n     * Called while the audio file is loading\n     *\n     * @private\n     * @param {Event} e Progress event\n     * @emits WaveSurfer#loading\n     */\n    onProgress(e) {\n        let percentComplete;\n        if (e.lengthComputable) {\n            percentComplete = e.loaded / e.total;\n        } else {\n            // Approximate progress with an asymptotic\n            // function, and assume downloads in the 1-3 MB range.\n            percentComplete = e.loaded / (e.loaded + 1000000);\n        }\n        this.fireEvent('loading', Math.round(percentComplete * 100), e.target);\n    }\n\n    /**\n     * Exports PCM data into a JSON array and opens in a new window.\n     *\n     * @param {number} length=1024 The scale in which to export the peaks. (Integer)\n     * @param {number} accuracy=10000 (Integer)\n     * @param {?boolean} noWindow Set to true to disable opening a new\n     * window with the JSON\n     * @param {number} start Start index\n     * @todo Update exportPCM to work with new getPeaks signature\n     * @return {string} JSON of peaks\n     */\n    exportPCM(length, accuracy, noWindow, start) {\n        length = length || 1024;\n        start = start || 0;\n        accuracy = accuracy || 10000;\n        noWindow = noWindow || false;\n        const peaks = this.backend.getPeaks(length, start);\n        const arr = [].map.call(\n            peaks,\n            val => Math.round(val * accuracy) / accuracy\n        );\n        const json = JSON.stringify(arr);\n        if (!noWindow) {\n            window.open(\n                'data:application/json;charset=utf-8,' +\n                    encodeURIComponent(json)\n            );\n        }\n        return json;\n    }\n\n    /**\n     * Save waveform image as data URI.\n     *\n     * The default format is `'image/png'`. Other supported types are\n     * `'image/jpeg'` and `'image/webp'`.\n     *\n     * @param {string} format='image/png' A string indicating the image format.\n     * The default format type is `'image/png'`.\n     * @param {number} quality=1 A number between 0 and 1 indicating the image\n     * quality to use for image formats that use lossy compression such as\n     * `'image/jpeg'`` and `'image/webp'`.\n     * @param {string} type Image data type to return. Either 'dataURL' (default)\n     * or 'blob'.\n     * @return {string|string[]|Promise} When using `'dataURL'` type this returns\n     * a single data URL or an array of data URLs, one for each canvas. When using\n     * `'blob'` type this returns a `Promise` resolving with an array of `Blob`\n     * instances, one for each canvas.\n     */\n    exportImage(format, quality, type) {\n        if (!format) {\n            format = 'image/png';\n        }\n        if (!quality) {\n            quality = 1;\n        }\n        if (!type) {\n            type = 'dataURL';\n        }\n\n        return this.drawer.getImage(format, quality, type);\n    }\n\n    /**\n     * Cancel any fetch request currently in progress\n     */\n    cancelAjax() {\n        if (this.currentRequest && this.currentRequest.controller) {\n            this.currentRequest.controller.abort();\n            this.currentRequest = null;\n        }\n    }\n\n    /**\n     * @private\n     */\n    clearTmpEvents() {\n        this.tmpEvents.forEach(e => e.un());\n    }\n\n    /**\n     * Display empty waveform.\n     */\n    empty() {\n        if (!this.backend.isPaused()) {\n            this.stop();\n            this.backend.disconnectSource();\n        }\n        this.isReady = false;\n        this.cancelAjax();\n        this.clearTmpEvents();\n\n        // empty drawer\n        this.drawer.progress(0);\n        this.drawer.setWidth(0);\n        this.drawer.drawPeaks({ length: this.drawer.getWidth() }, 0);\n    }\n\n    /**\n     * Remove events, elements and disconnect WebAudio nodes.\n     *\n     * @emits WaveSurfer#destroy\n     */\n    destroy() {\n        this.destroyAllPlugins();\n        this.fireEvent('destroy');\n        this.cancelAjax();\n        this.clearTmpEvents();\n        this.unAll();\n        if (this.params.responsive !== false) {\n            window.removeEventListener('resize', this._onResize, true);\n            window.removeEventListener(\n                'orientationchange',\n                this._onResize,\n                true\n            );\n        }\n        if (this.backend) {\n            this.backend.destroy();\n        }\n        if (this.drawer) {\n            this.drawer.destroy();\n        }\n        this.isDestroyed = true;\n        this.isReady = false;\n        this.arraybuffer = null;\n    }\n}\n","import Observer from './observer';\n\n/**\n * Perform an ajax request using `XMLHttpRequest`.\n *\n * @deprecated Use `util.fetchFile` instead.\n *\n * @param {Object} options AJAX options to use. See example below for options.\n * @returns {Observer} Observer instance\n * @example\n * // default options\n * let options = {\n *     method: 'GET',\n *     url: undefined,\n *     responseType: 'json',\n *     xhr: {}\n * };\n *\n * // override default options\n * options.url = '../media/demo.wav';\n * options.responseType = 'arraybuffer';\n * options.xhr = {\n *     requestHeaders: [\n *         {\n *             key: 'Authorization',\n *             value: 'my-token'\n *         }\n *     ],\n *     withCredentials: true\n * };\n *\n * // make ajax call\n * let ajaxCall = util.ajax(options);\n * ajaxCall.on('progress', e => {\n *     console.log('progress', e);\n * });\n * ajaxCall.on('success', (data, e) => {\n *     console.log('success!', data);\n * });\n * ajaxCall.on('error', e => {\n *     console.warn('ajax error: ' + e.target.statusText);\n * });\n */\nexport default function ajax(options) {\n    const instance = new Observer();\n    const xhr = new XMLHttpRequest();\n    let fired100 = false;\n    xhr.open(options.method || 'GET', options.url, true);\n    xhr.responseType = options.responseType || 'json';\n\n    if (options.xhr) {\n        if (options.xhr.requestHeaders) {\n            // add custom request headers\n            options.xhr.requestHeaders.forEach(header => {\n                xhr.setRequestHeader(header.key, header.value);\n            });\n        }\n        if (options.xhr.withCredentials) {\n            // use credentials\n            xhr.withCredentials = true;\n        }\n    }\n\n    xhr.addEventListener('progress', e => {\n        instance.fireEvent('progress', e);\n        if (e.lengthComputable && e.loaded == e.total) {\n            fired100 = true;\n        }\n    });\n    xhr.addEventListener('load', e => {\n        if (!fired100) {\n            instance.fireEvent('progress', e);\n        }\n        instance.fireEvent('load', e);\n        if (200 == xhr.status || 206 == xhr.status) {\n            instance.fireEvent('success', xhr.response, e);\n        } else {\n            instance.fireEvent('error', e);\n        }\n    });\n    xhr.addEventListener('error', e => instance.fireEvent('error', e));\n    xhr.send();\n    instance.xhr = xhr;\n    return instance;\n}\n","/**\n * Get the largest value\n *\n * @param   {Array} values Array of numbers\n * @returns {Number} Largest number found\n * @example console.log(max([1, 2, 3])); // logs 3\n */\nexport default function max(values) {\n    let largest = -Infinity;\n    Object.keys(values).forEach(i => {\n        if (values[i] > largest) {\n            largest = values[i];\n        }\n    });\n    return largest;\n}\n","/**\n * Get the smallest value\n *\n * @param   {Array} values Array of numbers\n * @returns {Number} Smallest number found\n * @example console.log(min([1, 2, 3])); // logs 1\n */\nexport default function min(values) {\n    let smallest = Number(Infinity);\n    Object.keys(values).forEach(i => {\n        if (values[i] < smallest) {\n            smallest = values[i];\n        }\n    });\n    return smallest;\n}\n","/**\n * Extend an object shallowly with others\n *\n * @param {Object} dest The target object\n * @param {Object[]} sources The objects to use for extending\n *\n * @return {Object} Merged object\n */\nexport default function extend(dest, ...sources) {\n    sources.forEach(source => {\n        Object.keys(source).forEach(key => {\n            dest[key] = source[key];\n        });\n    });\n    return dest;\n}\n","import reqAnimationFrame from './request-animation-frame';\n\n/**\n * Create a function which will be called at the next requestAnimationFrame\n * cycle\n *\n * @param {function} func The function to call\n *\n * @return {func} The function wrapped within a requestAnimationFrame\n */\nexport default function frame(func) {\n    return (...args) => reqAnimationFrame(() => func(...args));\n}\n","/**\n * Returns a function, that, as long as it continues to be invoked, will not\n * be triggered. The function will be called after it stops being called for\n * N milliseconds. If `immediate` is passed, trigger the function on the\n * leading edge, instead of the trailing. The function also has a property 'clear' \n * that is a function which will clear the timer to prevent previously scheduled executions. \n *\n * @source underscore.js\n * @see http://unscriptable.com/2009/03/20/debouncing-javascript-methods/\n * @param {Function} function to wrap\n * @param {Number} timeout in ms (`100`)\n * @param {Boolean} whether to execute at the beginning (`false`)\n * @api public\n */\nfunction debounce(func, wait, immediate){\n  var timeout, args, context, timestamp, result;\n  if (null == wait) wait = 100;\n\n  function later() {\n    var last = Date.now() - timestamp;\n\n    if (last < wait && last >= 0) {\n      timeout = setTimeout(later, wait - last);\n    } else {\n      timeout = null;\n      if (!immediate) {\n        result = func.apply(context, args);\n        context = args = null;\n      }\n    }\n  };\n\n  var debounced = function(){\n    context = this;\n    args = arguments;\n    timestamp = Date.now();\n    var callNow = immediate && !timeout;\n    if (!timeout) timeout = setTimeout(later, wait);\n    if (callNow) {\n      result = func.apply(context, args);\n      context = args = null;\n    }\n\n    return result;\n  };\n\n  debounced.clear = function() {\n    if (timeout) {\n      clearTimeout(timeout);\n      timeout = null;\n    }\n  };\n  \n  debounced.flush = function() {\n    if (timeout) {\n      result = func.apply(context, args);\n      context = args = null;\n      \n      clearTimeout(timeout);\n      timeout = null;\n    }\n  };\n\n  return debounced;\n};\n\n// Adds compatibility for ES modules\ndebounce.debounce = debounce;\n\nmodule.exports = debounce;\n","/**\n * Stops propagation of click event and removes event listener\n *\n * @private\n * @param {object} event The click event\n */\nfunction preventClickHandler(event) {\n    event.stopPropagation();\n    document.body.removeEventListener('click', preventClickHandler, true);\n}\n\n/**\n * Starts listening for click event and prevent propagation\n *\n * @param {object} values Values\n */\nexport default function preventClick(values) {\n    document.body.addEventListener('click', preventClickHandler, true);\n}\n","/**\n * @since 3.0.0\n */\n\nimport Observer from './observer';\n\nclass ProgressHandler {\n    /**\n     * Instantiate ProgressHandler\n     *\n     * @param {Observer} instance The `fetchFile` observer instance.\n     * @param {Number} contentLength Content length.\n     * @param {Response} response Response object.\n     */\n    constructor(instance, contentLength, response) {\n        this.instance = instance;\n        this.instance._reader = response.body.getReader();\n\n        this.total = parseInt(contentLength, 10);\n        this.loaded = 0;\n    }\n\n    /**\n     * A method that is called once, immediately after the `ReadableStream``\n     * is constructed.\n     *\n     * @param {ReadableStreamDefaultController} controller Controller instance\n     *     used to control the stream.\n     */\n    start(controller) {\n        const read = () => {\n            // instance._reader.read() returns a promise that resolves\n            // when a value has been received\n            this.instance._reader\n                .read()\n                .then(({ done, value }) => {\n                    // result objects contain two properties:\n                    // done  - true if the stream has already given you all its data.\n                    // value - some data. Always undefined when done is true.\n                    if (done) {\n                        // ensure onProgress called when content-length=0\n                        if (this.total === 0) {\n                            this.instance.onProgress.call(this.instance, {\n                                loaded: this.loaded,\n                                total: this.total,\n                                lengthComputable: false\n                            });\n                        }\n                        // no more data needs to be consumed, close the stream\n                        controller.close();\n                        return;\n                    }\n\n                    this.loaded += value.byteLength;\n                    this.instance.onProgress.call(this.instance, {\n                        loaded: this.loaded,\n                        total: this.total,\n                        lengthComputable: !(this.total === 0)\n                    });\n                    // enqueue the next data chunk into our target stream\n                    controller.enqueue(value);\n                    read();\n                })\n                .catch(error => {\n                    controller.error(error);\n                });\n        };\n\n        read();\n    }\n}\n\n/**\n * Load a file using `fetch`.\n *\n * @param {object} options Request options to use. See example below.\n * @returns {Observer} Observer instance\n * @example\n * // default options\n * let options = {\n *     url: undefined,\n *     method: 'GET',\n *     mode: 'cors',\n *     credentials: 'same-origin',\n *     cache: 'default',\n *     responseType: 'json',\n *     requestHeaders: [],\n *     redirect: 'follow',\n *     referrer: 'client'\n * };\n *\n * // override some options\n * options.url = '../media/demo.wav';\n\n * // available types: 'arraybuffer', 'blob', 'json' or 'text'\n * options.responseType = 'arraybuffer';\n *\n * // make fetch call\n * let request = util.fetchFile(options);\n *\n * // listen for events\n * request.on('progress', e => {\n *     console.log('progress', e);\n * });\n *\n * request.on('success', data => {\n *     console.log('success!', data);\n * });\n *\n * request.on('error', e => {\n *     console.warn('fetchFile error: ', e);\n * });\n */\nexport default function fetchFile(options) {\n    if (!options) {\n        throw new Error('fetch options missing');\n    } else if (!options.url) {\n        throw new Error('fetch url missing');\n    }\n    const instance = new Observer();\n    const fetchHeaders = new Headers();\n    const fetchRequest = new Request(options.url);\n\n    // add ability to abort\n    instance.controller = new AbortController();\n\n    // check if headers have to be added\n    if (options && options.requestHeaders) {\n        // add custom request headers\n        options.requestHeaders.forEach(header => {\n            fetchHeaders.append(header.key, header.value);\n        });\n    }\n\n    // parse fetch options\n    const responseType = options.responseType || 'json';\n    const fetchOptions = {\n        method: options.method || 'GET',\n        headers: fetchHeaders,\n        mode: options.mode || 'cors',\n        credentials: options.credentials || 'same-origin',\n        cache: options.cache || 'default',\n        redirect: options.redirect || 'follow',\n        referrer: options.referrer || 'client',\n        signal: instance.controller.signal\n    };\n\n    fetch(fetchRequest, fetchOptions)\n        .then(response => {\n            // store response reference\n            instance.response = response;\n\n            let progressAvailable = true;\n            if (!response.body) {\n                // ReadableStream is not yet supported in this browser\n                // see https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream\n                progressAvailable = false;\n            }\n\n            // Server must send CORS header \"Access-Control-Expose-Headers: content-length\"\n            const contentLength = response.headers.get('content-length');\n            if (contentLength === null) {\n                // Content-Length server response header missing.\n                // Don't evaluate download progress if we can't compare against a total size\n                // see https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Access-Control-Expose-Headers\n                progressAvailable = false;\n            }\n\n            if (!progressAvailable) {\n                // not able to check download progress so skip it\n                return response;\n            }\n\n            // fire progress event when during load\n            instance.onProgress = e => {\n                instance.fireEvent('progress', e);\n            };\n\n            return new Response(\n                new ReadableStream(\n                    new ProgressHandler(instance, contentLength, response)\n                ),\n                fetchOptions\n            );\n        })\n        .then(response => {\n            let errMsg;\n            if (response.ok) {\n                switch (responseType) {\n                    case 'arraybuffer':\n                        return response.arrayBuffer();\n\n                    case 'json':\n                        return response.json();\n\n                    case 'blob':\n                        return response.blob();\n\n                    case 'text':\n                        return response.text();\n\n                    default:\n                        errMsg = 'Unknown responseType: ' + responseType;\n                        break;\n                }\n            }\n            if (!errMsg) {\n                errMsg = 'HTTP error status: ' + response.status;\n            }\n            throw new Error(errMsg);\n        })\n        .then(response => {\n            instance.fireEvent('success', response);\n        })\n        .catch(error => {\n            instance.fireEvent('error', error);\n        });\n\n    // return the fetch request\n    instance.fetchRequest = fetchRequest;\n    return instance;\n}\n","import Drawer from './drawer';\nimport * as util from './util';\nimport CanvasEntry from './drawer.canvasentry';\n\n/**\n * MultiCanvas renderer for wavesurfer. Is currently the default and sole\n * builtin renderer.\n *\n * A `MultiCanvas` consists of one or more `CanvasEntry` instances, depending\n * on the zoom level.\n */\nexport default class MultiCanvas extends Drawer {\n    /**\n     * @param {HTMLElement} container The container node of the wavesurfer instance\n     * @param {WavesurferParams} params The wavesurfer initialisation options\n     */\n    constructor(container, params) {\n        super(container, params);\n\n        /**\n         * @type {number}\n         * @private\n         */\n        this.maxCanvasWidth = params.maxCanvasWidth;\n\n        /**\n         * @private\n         * @type {number}\n         */\n        this.maxCanvasElementWidth = Math.round(\n            params.maxCanvasWidth / params.pixelRatio\n        );\n\n        /**\n         * Whether or not the progress wave is rendered. If the `waveColor`\n         * and `progressColor` are the same color it is not.\n         *\n         * @type {boolean}\n         */\n        this.hasProgressCanvas = params.waveColor != params.progressColor;\n\n        /**\n         * @private\n         * @type {number}\n         */\n        this.halfPixel = 0.5 / params.pixelRatio;\n\n        /**\n         * List of `CanvasEntry` instances.\n         *\n         * @private\n         * @type {Array}\n         */\n        this.canvases = [];\n\n        /**\n         * @private\n         * @type {HTMLElement}\n         */\n        this.progressWave = null;\n\n        /**\n         * Class used to generate entries.\n         *\n         * @private\n         * @type {function}\n         */\n        this.EntryClass = CanvasEntry;\n\n        /**\n         * Overlap added between entries to prevent vertical white stripes\n         * between `canvas` elements.\n         *\n         * @type {number}\n         */\n        this.overlap = 2 * Math.ceil(params.pixelRatio / 2);\n\n        /**\n         * The radius of the wave bars. Makes bars rounded\n         *\n         * @private\n         * @type {number}\n         */\n        this.barRadius = params.barRadius || 0;\n    }\n\n    /**\n     * Initialize the drawer\n     */\n    init() {\n        this.createWrapper();\n        this.createElements();\n    }\n\n    /**\n     * Create the canvas elements and style them\n     *\n     * @private\n     */\n    createElements() {\n        this.progressWave = this.wrapper.appendChild(\n            this.style(document.createElement('wave'), {\n                position: 'absolute',\n                zIndex: 3,\n                left: 0,\n                top: 0,\n                bottom: 0,\n                overflow: 'hidden',\n                width: '0',\n                display: 'none',\n                boxSizing: 'border-box',\n                borderRightStyle: 'solid',\n                pointerEvents: 'none'\n            })\n        );\n\n        this.addCanvas();\n        this.updateCursor();\n    }\n\n    /**\n     * Update cursor style\n     */\n    updateCursor() {\n        this.style(this.progressWave, {\n            borderRightWidth: this.params.cursorWidth + 'px',\n            borderRightColor: this.params.cursorColor\n        });\n    }\n\n    /**\n     * Adjust to the updated size by adding or removing canvases\n     */\n    updateSize() {\n        const totalWidth = Math.round(this.width / this.params.pixelRatio);\n        const requiredCanvases = Math.ceil(\n            totalWidth / (this.maxCanvasElementWidth + this.overlap)\n        );\n\n        // add required canvases\n        while (this.canvases.length < requiredCanvases) {\n            this.addCanvas();\n        }\n\n        // remove older existing canvases, if any\n        while (this.canvases.length > requiredCanvases) {\n            this.removeCanvas();\n        }\n\n        let canvasWidth = this.maxCanvasWidth + this.overlap;\n        const lastCanvas = this.canvases.length - 1;\n        this.canvases.forEach((entry, i) => {\n            if (i == lastCanvas) {\n                canvasWidth = this.width - this.maxCanvasWidth * lastCanvas;\n            }\n            this.updateDimensions(entry, canvasWidth, this.height);\n\n            entry.clearWave();\n        });\n    }\n\n    /**\n     * Add a canvas to the canvas list\n     *\n     * @private\n     */\n    addCanvas() {\n        const entry = new this.EntryClass();\n        entry.hasProgressCanvas = this.hasProgressCanvas;\n        entry.halfPixel = this.halfPixel;\n        const leftOffset = this.maxCanvasElementWidth * this.canvases.length;\n\n        // wave\n        entry.initWave(\n            this.wrapper.appendChild(\n                this.style(document.createElement('canvas'), {\n                    position: 'absolute',\n                    zIndex: 2,\n                    left: leftOffset + 'px',\n                    top: 0,\n                    bottom: 0,\n                    height: '100%',\n                    pointerEvents: 'none'\n                })\n            )\n        );\n\n        // progress\n        if (this.hasProgressCanvas) {\n            entry.initProgress(\n                this.progressWave.appendChild(\n                    this.style(document.createElement('canvas'), {\n                        position: 'absolute',\n                        left: leftOffset + 'px',\n                        top: 0,\n                        bottom: 0,\n                        height: '100%'\n                    })\n                )\n            );\n        }\n\n        this.canvases.push(entry);\n    }\n\n    /**\n     * Pop single canvas from the list\n     *\n     * @private\n     */\n    removeCanvas() {\n        let lastEntry = this.canvases[this.canvases.length - 1];\n\n        // wave\n        lastEntry.wave.parentElement.removeChild(lastEntry.wave);\n\n        // progress\n        if (this.hasProgressCanvas) {\n            lastEntry.progress.parentElement.removeChild(lastEntry.progress);\n        }\n\n        // cleanup\n        if (lastEntry) {\n            lastEntry.destroy();\n            lastEntry = null;\n        }\n\n        this.canvases.pop();\n    }\n\n    /**\n     * Update the dimensions of a canvas element\n     *\n     * @private\n     * @param {CanvasEntry} entry Target entry\n     * @param {number} width The new width of the element\n     * @param {number} height The new height of the element\n     */\n    updateDimensions(entry, width, height) {\n        const elementWidth = Math.round(width / this.params.pixelRatio);\n        const totalWidth = Math.round(this.width / this.params.pixelRatio);\n\n        // update canvas dimensions\n        entry.updateDimensions(elementWidth, totalWidth, width, height);\n\n        // style element\n        this.style(this.progressWave, { display: 'block' });\n    }\n\n    /**\n     * Clear the whole multi-canvas\n     */\n    clearWave() {\n        this.canvases.forEach(entry => entry.clearWave());\n    }\n\n    /**\n     * Draw a waveform with bars\n     *\n     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays\n     * for split channel rendering\n     * @param {number} channelIndex The index of the current channel. Normally\n     * should be 0. Must be an integer.\n     * @param {number} start The x-offset of the beginning of the area that\n     * should be rendered\n     * @param {number} end The x-offset of the end of the area that should be\n     * rendered\n     * @returns {void}\n     */\n    drawBars(peaks, channelIndex, start, end) {\n        return this.prepareDraw(\n            peaks,\n            channelIndex,\n            start,\n            end,\n            ({ absmax, hasMinVals, height, offsetY, halfH, peaks }) => {\n                // if drawBars was called within ws.empty we don't pass a start and\n                // don't want anything to happen\n                if (start === undefined) {\n                    return;\n                }\n                // Skip every other value if there are negatives.\n                const peakIndexScale = hasMinVals ? 2 : 1;\n                const length = peaks.length / peakIndexScale;\n                const bar = this.params.barWidth * this.params.pixelRatio;\n                const gap =\n                    this.params.barGap === null\n                        ? Math.max(this.params.pixelRatio, ~~(bar / 2))\n                        : Math.max(\n                              this.params.pixelRatio,\n                              this.params.barGap * this.params.pixelRatio\n                          );\n                const step = bar + gap;\n\n                const scale = length / this.width;\n                const first = start;\n                const last = end;\n                let i = first;\n\n                for (i; i < last; i += step) {\n                    const peak =\n                        peaks[Math.floor(i * scale * peakIndexScale)] || 0;\n                    const h = Math.round((peak / absmax) * halfH);\n                    this.fillRect(\n                        i + this.halfPixel,\n                        halfH - h + offsetY,\n                        bar + this.halfPixel,\n                        h * 2,\n                        this.barRadius\n                    );\n                }\n            }\n        );\n    }\n\n    /**\n     * Draw a waveform\n     *\n     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays\n     * for split channel rendering\n     * @param {number} channelIndex The index of the current channel. Normally\n     * should be 0\n     * @param {number?} start The x-offset of the beginning of the area that\n     * should be rendered (If this isn't set only a flat line is rendered)\n     * @param {number?} end The x-offset of the end of the area that should be\n     * rendered\n     * @returns {void}\n     */\n    drawWave(peaks, channelIndex, start, end) {\n        return this.prepareDraw(\n            peaks,\n            channelIndex,\n            start,\n            end,\n            ({ absmax, hasMinVals, height, offsetY, halfH, peaks }) => {\n                if (!hasMinVals) {\n                    const reflectedPeaks = [];\n                    const len = peaks.length;\n                    let i = 0;\n                    for (i; i < len; i++) {\n                        reflectedPeaks[2 * i] = peaks[i];\n                        reflectedPeaks[2 * i + 1] = -peaks[i];\n                    }\n                    peaks = reflectedPeaks;\n                }\n\n                // if drawWave was called within ws.empty we don't pass a start and\n                // end and simply want a flat line\n                if (start !== undefined) {\n                    this.drawLine(peaks, absmax, halfH, offsetY, start, end);\n                }\n\n                // always draw a median line\n                this.fillRect(\n                    0,\n                    halfH + offsetY - this.halfPixel,\n                    this.width,\n                    this.halfPixel,\n                    this.barRadius\n                );\n            }\n        );\n    }\n\n    /**\n     * Tell the canvas entries to render their portion of the waveform\n     *\n     * @private\n     * @param {number[]} peaks Peaks data\n     * @param {number} absmax Maximum peak value (absolute)\n     * @param {number} halfH Half the height of the waveform\n     * @param {number} offsetY Offset to the top\n     * @param {number} start The x-offset of the beginning of the area that\n     * should be rendered\n     * @param {number} end The x-offset of the end of the area that\n     * should be rendered\n     */\n    drawLine(peaks, absmax, halfH, offsetY, start, end) {\n        this.canvases.forEach(entry => {\n            this.setFillStyles(entry);\n            entry.drawLines(peaks, absmax, halfH, offsetY, start, end);\n        });\n    }\n\n    /**\n     * Draw a rectangle on the multi-canvas\n     *\n     * @param {number} x X-position of the rectangle\n     * @param {number} y Y-position of the rectangle\n     * @param {number} width Width of the rectangle\n     * @param {number} height Height of the rectangle\n     * @param {number} radius Radius of the rectangle\n     */\n    fillRect(x, y, width, height, radius) {\n        const startCanvas = Math.floor(x / this.maxCanvasWidth);\n        const endCanvas = Math.min(\n            Math.ceil((x + width) / this.maxCanvasWidth) + 1,\n            this.canvases.length\n        );\n        let i = startCanvas;\n        for (i; i < endCanvas; i++) {\n            const entry = this.canvases[i];\n            const leftOffset = i * this.maxCanvasWidth;\n\n            const intersection = {\n                x1: Math.max(x, i * this.maxCanvasWidth),\n                y1: y,\n                x2: Math.min(\n                    x + width,\n                    i * this.maxCanvasWidth + entry.wave.width\n                ),\n                y2: y + height\n            };\n\n            if (intersection.x1 < intersection.x2) {\n                this.setFillStyles(entry);\n\n                entry.fillRects(\n                    intersection.x1 - leftOffset,\n                    intersection.y1,\n                    intersection.x2 - intersection.x1,\n                    intersection.y2 - intersection.y1,\n                    radius\n                );\n            }\n        }\n    }\n\n    /**\n     * Performs preparation tasks and calculations which are shared by `drawBars`\n     * and `drawWave`\n     *\n     * @private\n     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays for\n     * split channel rendering\n     * @param {number} channelIndex The index of the current channel. Normally\n     * should be 0\n     * @param {number?} start The x-offset of the beginning of the area that\n     * should be rendered. If this isn't set only a flat line is rendered\n     * @param {number?} end The x-offset of the end of the area that should be\n     * rendered\n     * @param {function} fn The render function to call, e.g. `drawWave`\n     * @returns {void}\n     */\n    prepareDraw(peaks, channelIndex, start, end, fn) {\n        return util.frame(() => {\n            // Split channels and call this function with the channelIndex set\n            if (peaks[0] instanceof Array) {\n                const channels = peaks;\n                if (this.params.splitChannels) {\n                    this.setHeight(\n                        channels.length *\n                            this.params.height *\n                            this.params.pixelRatio\n                    );\n                    return channels.forEach((channelPeaks, i) =>\n                        this.prepareDraw(channelPeaks, i, start, end, fn)\n                    );\n                }\n                peaks = channels[0];\n            }\n            // calculate maximum modulation value, either from the barHeight\n            // parameter or if normalize=true from the largest value in the peak\n            // set\n            let absmax = 1 / this.params.barHeight;\n            if (this.params.normalize) {\n                const max = util.max(peaks);\n                const min = util.min(peaks);\n                absmax = -min > max ? -min : max;\n            }\n\n            // Bar wave draws the bottom only as a reflection of the top,\n            // so we don't need negative values\n            const hasMinVals = [].some.call(peaks, val => val < 0);\n            const height = this.params.height * this.params.pixelRatio;\n            const offsetY = height * channelIndex || 0;\n            const halfH = height / 2;\n\n            return fn({\n                absmax: absmax,\n                hasMinVals: hasMinVals,\n                height: height,\n                offsetY: offsetY,\n                halfH: halfH,\n                peaks: peaks\n            });\n        })();\n    }\n\n    /**\n     * Set the fill styles for a certain entry (wave and progress)\n     *\n     * @private\n     * @param {CanvasEntry} entry Target entry\n     */\n    setFillStyles(entry) {\n        entry.setFillStyles(this.params.waveColor, this.params.progressColor);\n    }\n\n    /**\n     * Return image data of the multi-canvas\n     *\n     * When using a `type` of `'blob'`, this will return a `Promise`.\n     *\n     * @param {string} format='image/png' An optional value of a format type.\n     * @param {number} quality=0.92 An optional value between 0 and 1.\n     * @param {string} type='dataURL' Either 'dataURL' or 'blob'.\n     * @return {string|string[]|Promise} When using the default `'dataURL'`\n     * `type` this returns a single data URL or an array of data URLs,\n     * one for each canvas. When using the `'blob'` `type` this returns a\n     * `Promise` that resolves with an array of `Blob` instances, one for each\n     * canvas.\n     */\n    getImage(format, quality, type) {\n        if (type === 'blob') {\n            return Promise.all(\n                this.canvases.map(entry => {\n                    return entry.getImage(format, quality, type);\n                })\n            );\n        } else if (type === 'dataURL') {\n            let images = this.canvases.map(entry =>\n                entry.getImage(format, quality, type)\n            );\n            return images.length > 1 ? images : images[0];\n        }\n    }\n\n    /**\n     * Render the new progress\n     *\n     * @param {number} position X-offset of progress position in pixels\n     */\n    updateProgress(position) {\n        this.style(this.progressWave, { width: position + 'px' });\n    }\n}\n","import * as util from './util';\n\n/**\n * Parent class for renderers\n *\n * @extends {Observer}\n */\nexport default class Drawer extends util.Observer {\n    /**\n     * @param {HTMLElement} container The container node of the wavesurfer instance\n     * @param {WavesurferParams} params The wavesurfer initialisation options\n     */\n    constructor(container, params) {\n        super();\n        /** @private */\n        this.container = container;\n        /**\n         * @type {WavesurferParams}\n         * @private\n         */\n        this.params = params;\n        /**\n         * The width of the renderer\n         * @type {number}\n         */\n        this.width = 0;\n        /**\n         * The height of the renderer\n         * @type {number}\n         */\n        this.height = params.height * this.params.pixelRatio;\n        /** @private */\n        this.lastPos = 0;\n        /**\n         * The `<wave>` element which is added to the container\n         * @type {HTMLElement}\n         */\n        this.wrapper = null;\n    }\n\n    /**\n     * Alias of `util.style`\n     *\n     * @param {HTMLElement} el The element that the styles will be applied to\n     * @param {Object} styles The map of propName: attribute, both are used as-is\n     * @return {HTMLElement} el\n     */\n    style(el, styles) {\n        return util.style(el, styles);\n    }\n\n    /**\n     * Create the wrapper `<wave>` element, style it and set up the events for\n     * interaction\n     */\n    createWrapper() {\n        this.wrapper = this.container.appendChild(\n            document.createElement('wave')\n        );\n\n        this.style(this.wrapper, {\n            display: 'block',\n            position: 'relative',\n            userSelect: 'none',\n            webkitUserSelect: 'none',\n            height: this.params.height + 'px'\n        });\n\n        if (this.params.fillParent || this.params.scrollParent) {\n            this.style(this.wrapper, {\n                width: '100%',\n                overflowX: this.params.hideScrollbar ? 'hidden' : 'auto',\n                overflowY: 'hidden'\n            });\n        }\n\n        this.setupWrapperEvents();\n    }\n\n    /**\n     * Handle click event\n     *\n     * @param {Event} e Click event\n     * @param {?boolean} noPrevent Set to true to not call `e.preventDefault()`\n     * @return {number} Playback position from 0 to 1\n     */\n    handleEvent(e, noPrevent) {\n        !noPrevent && e.preventDefault();\n\n        const clientX = e.targetTouches\n            ? e.targetTouches[0].clientX\n            : e.clientX;\n        const bbox = this.wrapper.getBoundingClientRect();\n\n        const nominalWidth = this.width;\n        const parentWidth = this.getWidth();\n\n        let progress;\n        if (!this.params.fillParent && nominalWidth < parentWidth) {\n            progress =\n                (this.params.rtl ? bbox.right - clientX : clientX - bbox.left) *\n                    (this.params.pixelRatio / nominalWidth) || 0;\n\n            if (progress > 1) {\n                progress = 1;\n            }\n        } else {\n            progress =\n                ((this.params.rtl\n                    ? bbox.right - clientX\n                    : clientX - bbox.left) +\n                    this.wrapper.scrollLeft) /\n                    this.wrapper.scrollWidth || 0;\n        }\n\n        return progress;\n    }\n\n    /**\n     * @private\n     */\n    setupWrapperEvents() {\n        this.wrapper.addEventListener('click', e => {\n            const scrollbarHeight =\n                this.wrapper.offsetHeight - this.wrapper.clientHeight;\n            if (scrollbarHeight !== 0) {\n                // scrollbar is visible.  Check if click was on it\n                const bbox = this.wrapper.getBoundingClientRect();\n                if (e.clientY >= bbox.bottom - scrollbarHeight) {\n                    // ignore mousedown as it was on the scrollbar\n                    return;\n                }\n            }\n\n            if (this.params.interact) {\n                this.fireEvent('click', e, this.handleEvent(e));\n            }\n        });\n\n        this.wrapper.addEventListener('dblclick', e => {\n            if (this.params.interact) {\n                this.fireEvent('dblclick', e);\n            }\n        });\n\n        this.wrapper.addEventListener('scroll', e =>\n            this.fireEvent('scroll', e)\n        );\n    }\n\n    /**\n     * Draw peaks on the canvas\n     *\n     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays\n     * for split channel rendering\n     * @param {number} length The width of the area that should be drawn\n     * @param {number} start The x-offset of the beginning of the area that\n     * should be rendered\n     * @param {number} end The x-offset of the end of the area that should be\n     * rendered\n     */\n    drawPeaks(peaks, length, start, end) {\n        if (!this.setWidth(length)) {\n            this.clearWave();\n        }\n\n        this.params.barWidth\n            ? this.drawBars(peaks, 0, start, end)\n            : this.drawWave(peaks, 0, start, end);\n    }\n\n    /**\n     * Scroll to the beginning\n     */\n    resetScroll() {\n        if (this.wrapper !== null) {\n            this.wrapper.scrollLeft = 0;\n        }\n    }\n\n    /**\n     * Recenter the view-port at a certain percent of the waveform\n     *\n     * @param {number} percent Value from 0 to 1 on the waveform\n     */\n    recenter(percent) {\n        const position = this.wrapper.scrollWidth * percent;\n        this.recenterOnPosition(position, true);\n    }\n\n    /**\n     * Recenter the view-port on a position, either scroll there immediately or\n     * in steps of 5 pixels\n     *\n     * @param {number} position X-offset in pixels\n     * @param {boolean} immediate Set to true to immediately scroll somewhere\n     */\n    recenterOnPosition(position, immediate) {\n        const scrollLeft = this.wrapper.scrollLeft;\n        const half = ~~(this.wrapper.clientWidth / 2);\n        const maxScroll = this.wrapper.scrollWidth - this.wrapper.clientWidth;\n        let target = position - half;\n        let offset = target - scrollLeft;\n\n        if (maxScroll == 0) {\n            // no need to continue if scrollbar is not there\n            return;\n        }\n\n        // if the cursor is currently visible...\n        if (!immediate && -half <= offset && offset < half) {\n            // set rate at which waveform is centered\n            let rate = this.params.autoCenterRate;\n\n            // make rate depend on width of view and length of waveform\n            rate /= half;\n            rate *= maxScroll;\n\n            offset = Math.max(-rate, Math.min(rate, offset));\n            target = scrollLeft + offset;\n        }\n\n        // limit target to valid range (0 to maxScroll)\n        target = Math.max(0, Math.min(maxScroll, target));\n        // no use attempting to scroll if we're not moving\n        if (target != scrollLeft) {\n            this.wrapper.scrollLeft = target;\n        }\n    }\n\n    /**\n     * Get the current scroll position in pixels\n     *\n     * @return {number} Horizontal scroll position in pixels\n     */\n    getScrollX() {\n        let x = 0;\n        if (this.wrapper) {\n            const pixelRatio = this.params.pixelRatio;\n            x = Math.round(this.wrapper.scrollLeft * pixelRatio);\n\n            // In cases of elastic scroll (safari with mouse wheel) you can\n            // scroll beyond the limits of the container\n            // Calculate and floor the scrollable extent to make sure an out\n            // of bounds value is not returned\n            // Ticket #1312\n            if (this.params.scrollParent) {\n                const maxScroll = ~~(\n                    this.wrapper.scrollWidth * pixelRatio -\n                    this.getWidth()\n                );\n                x = Math.min(maxScroll, Math.max(0, x));\n            }\n        }\n        return x;\n    }\n\n    /**\n     * Get the width of the container\n     *\n     * @return {number} The width of the container\n     */\n    getWidth() {\n        return Math.round(this.container.clientWidth * this.params.pixelRatio);\n    }\n\n    /**\n     * Set the width of the container\n     *\n     * @param {number} width The new width of the container\n     * @return {boolean} Whether the width of the container was updated or not\n     */\n    setWidth(width) {\n        if (this.width == width) {\n            return false;\n        }\n\n        this.width = width;\n\n        if (this.params.fillParent || this.params.scrollParent) {\n            this.style(this.wrapper, {\n                width: ''\n            });\n        } else {\n            this.style(this.wrapper, {\n                width: ~~(this.width / this.params.pixelRatio) + 'px'\n            });\n        }\n\n        this.updateSize();\n        return true;\n    }\n\n    /**\n     * Set the height of the container\n     *\n     * @param {number} height The new height of the container.\n     * @return {boolean} Whether the height of the container was updated or not\n     */\n    setHeight(height) {\n        if (height == this.height) {\n            return false;\n        }\n        this.height = height;\n\n        this.style(this.wrapper, {\n            height: ~~(this.height / this.params.pixelRatio) + 'px'\n        });\n\n        this.updateSize();\n        return true;\n    }\n\n    /**\n     * Called by wavesurfer when progress should be rendered\n     *\n     * @param {number} progress From 0 to 1\n     */\n    progress(progress) {\n        const minPxDelta = 1 / this.params.pixelRatio;\n        const pos = Math.round(progress * this.width) * minPxDelta;\n\n        if (pos < this.lastPos || pos - this.lastPos >= minPxDelta) {\n            this.lastPos = pos;\n\n            if (this.params.scrollParent && this.params.autoCenter) {\n                const newPos = ~~(this.wrapper.scrollWidth * progress);\n                this.recenterOnPosition(\n                    newPos,\n                    this.params.autoCenterImmediately\n                );\n            }\n\n            this.updateProgress(pos);\n        }\n    }\n\n    /**\n     * This is called when wavesurfer is destroyed\n     */\n    destroy() {\n        this.unAll();\n        if (this.wrapper) {\n            if (this.wrapper.parentNode == this.container) {\n                this.container.removeChild(this.wrapper);\n            }\n            this.wrapper = null;\n        }\n    }\n\n    /* Renderer-specific methods */\n\n    /**\n     * Called after cursor related params have changed.\n     *\n     * @abstract\n     */\n    updateCursor() {}\n\n    /**\n     * Called when the size of the container changes so the renderer can adjust\n     *\n     * @abstract\n     */\n    updateSize() {}\n\n    /**\n     * Draw a waveform with bars\n     *\n     * @abstract\n     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays for split channel\n     * rendering\n     * @param {number} channelIndex The index of the current channel. Normally\n     * should be 0\n     * @param {number} start The x-offset of the beginning of the area that\n     * should be rendered\n     * @param {number} end The x-offset of the end of the area that should be\n     * rendered\n     */\n    drawBars(peaks, channelIndex, start, end) {}\n\n    /**\n     * Draw a waveform\n     *\n     * @abstract\n     * @param {number[]|Number.<Array[]>} peaks Can also be an array of arrays for split channel\n     * rendering\n     * @param {number} channelIndex The index of the current channel. Normally\n     * should be 0\n     * @param {number} start The x-offset of the beginning of the area that\n     * should be rendered\n     * @param {number} end The x-offset of the end of the area that should be\n     * rendered\n     */\n    drawWave(peaks, channelIndex, start, end) {}\n\n    /**\n     * Clear the waveform\n     *\n     * @abstract\n     */\n    clearWave() {}\n\n    /**\n     * Render the new progress\n     *\n     * @abstract\n     * @param {number} position X-Offset of progress position in pixels\n     */\n    updateProgress(position) {}\n}\n","/**\n * @since 3.0.0\n */\n\nimport style from './util/style';\nimport getId from './util/get-id';\n\n/**\n * The `CanvasEntry` class represents an element consisting of a wave `canvas`\n * and an (optional) progress wave `canvas`.\n *\n * The `MultiCanvas` renderer uses one or more `CanvasEntry` instances to\n * render a waveform, depending on the zoom level.\n */\nexport default class CanvasEntry {\n    constructor() {\n        /**\n         * The wave node\n         *\n         * @type {HTMLCanvasElement}\n         */\n        this.wave = null;\n        /**\n         * The wave canvas rendering context\n         *\n         * @type {CanvasRenderingContext2D}\n         */\n        this.waveCtx = null;\n        /**\n         * The (optional) progress wave node\n         *\n         * @type {HTMLCanvasElement}\n         */\n        this.progress = null;\n        /**\n         * The (optional) progress wave canvas rendering context\n         *\n         * @type {CanvasRenderingContext2D}\n         */\n        this.progressCtx = null;\n        /**\n         * Start of the area the canvas should render, between 0 and 1\n         *\n         * @type {number}\n         * @private\n         */\n        this.start = 0;\n        /**\n         * End of the area the canvas should render, between 0 and 1\n         *\n         * @type {number}\n         * @private\n         */\n        this.end = 1;\n        /**\n         * Unique identifier for this entry\n         *\n         * @type {string}\n         */\n        this.id = getId(this.constructor.name.toLowerCase() + '_');\n    }\n\n    /**\n     * Store the wave canvas element and create the 2D rendering context\n     *\n     * @param {HTMLCanvasElement} element The wave `canvas` element.\n     */\n    initWave(element) {\n        this.wave = element;\n        this.waveCtx = this.wave.getContext('2d');\n    }\n\n    /**\n     * Store the progress wave canvas element and create the 2D rendering\n     * context\n     *\n     * @param {HTMLCanvasElement} element The progress wave `canvas` element.\n     */\n    initProgress(element) {\n        this.progress = element;\n        this.progressCtx = this.progress.getContext('2d');\n    }\n\n    /**\n     * Update the dimensions\n     *\n     * @param {number} elementWidth Width of the entry\n     * @param {number} totalWidth Total width of the multi canvas renderer\n     * @param {number} width The new width of the element\n     * @param {number} height The new height of the element\n     */\n    updateDimensions(elementWidth, totalWidth, width, height) {\n        // where the canvas starts and ends in the waveform, represented as a\n        // decimal between 0 and 1\n        this.start = this.wave.offsetLeft / totalWidth || 0;\n        this.end = this.start + elementWidth / totalWidth;\n\n        // set wave canvas dimensions\n        this.wave.width = width;\n        this.wave.height = height;\n        let elementSize = { width: elementWidth + 'px' };\n        style(this.wave, elementSize);\n\n        if (this.hasProgressCanvas) {\n            // set progress canvas dimensions\n            this.progress.width = width;\n            this.progress.height = height;\n            style(this.progress, elementSize);\n        }\n    }\n\n    /**\n     * Clear the wave and progress rendering contexts\n     */\n    clearWave() {\n        // wave\n        this.waveCtx.clearRect(\n            0,\n            0,\n            this.waveCtx.canvas.width,\n            this.waveCtx.canvas.height\n        );\n\n        // progress\n        if (this.hasProgressCanvas) {\n            this.progressCtx.clearRect(\n                0,\n                0,\n                this.progressCtx.canvas.width,\n                this.progressCtx.canvas.height\n            );\n        }\n    }\n\n    /**\n     * Set the fill styles for wave and progress\n     *\n     * @param {string} waveColor Fill color for the wave canvas\n     * @param {?string} progressColor Fill color for the progress canvas\n     */\n    setFillStyles(waveColor, progressColor) {\n        this.waveCtx.fillStyle = waveColor;\n\n        if (this.hasProgressCanvas) {\n            this.progressCtx.fillStyle = progressColor;\n        }\n    }\n\n    /**\n     * Draw a rectangle for wave and progress\n     *\n     * @param {number} x X start position\n     * @param {number} y Y start position\n     * @param {number} width Width of the rectangle\n     * @param {number} height Height of the rectangle\n     * @param {number} radius Radius of the rectangle\n     */\n    fillRects(x, y, width, height, radius) {\n        this.fillRectToContext(this.waveCtx, x, y, width, height, radius);\n\n        if (this.hasProgressCanvas) {\n            this.fillRectToContext(\n                this.progressCtx,\n                x,\n                y,\n                width,\n                height,\n                radius\n            );\n        }\n    }\n\n    /**\n     * Draw the actual rectangle on a `canvas` element\n     *\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Rendering context of target canvas\n     * @param {number} x X start position\n     * @param {number} y Y start position\n     * @param {number} width Width of the rectangle\n     * @param {number} height Height of the rectangle\n     * @param {number} radius Radius of the rectangle\n     */\n    fillRectToContext(ctx, x, y, width, height, radius) {\n        if (!ctx) {\n            return;\n        }\n\n        if (radius) {\n            this.drawRoundedRect(ctx, x, y, width, height, radius);\n        } else {\n            ctx.fillRect(x, y, width, height);\n        }\n    }\n\n    /**\n     * Draw a rounded rectangle on Canvas\n     *\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Canvas context\n     * @param {number} x X-position of the rectangle\n     * @param {number} y Y-position of the rectangle\n     * @param {number} width Width of the rectangle\n     * @param {number} height Height of the rectangle\n     * @param {number} radius Radius of the rectangle\n     *\n     * @return {void}\n     * @example drawRoundedRect(ctx, 50, 50, 5, 10, 3)\n     */\n    drawRoundedRect(ctx, x, y, width, height, radius) {\n        if (height === 0) {\n            return;\n        }\n        // peaks are float values from -1 to 1. Use absolute height values in\n        // order to correctly calculate rounded rectangle coordinates\n        if (height < 0) {\n            height *= -1;\n            y -= height;\n        }\n        ctx.beginPath();\n        ctx.moveTo(x + radius, y);\n        ctx.lineTo(x + width - radius, y);\n        ctx.quadraticCurveTo(x + width, y, x + width, y + radius);\n        ctx.lineTo(x + width, y + height - radius);\n        ctx.quadraticCurveTo(\n            x + width,\n            y + height,\n            x + width - radius,\n            y + height\n        );\n        ctx.lineTo(x + radius, y + height);\n        ctx.quadraticCurveTo(x, y + height, x, y + height - radius);\n        ctx.lineTo(x, y + radius);\n        ctx.quadraticCurveTo(x, y, x + radius, y);\n        ctx.closePath();\n        ctx.fill();\n    }\n\n    /**\n     * Render the actual wave and progress lines\n     *\n     * @param {number[]} peaks Array with peaks data\n     * @param {number} absmax Maximum peak value (absolute)\n     * @param {number} halfH Half the height of the waveform\n     * @param {number} offsetY Offset to the top\n     * @param {number} start The x-offset of the beginning of the area that\n     * should be rendered\n     * @param {number} end The x-offset of the end of the area that\n     * should be rendered\n     */\n    drawLines(peaks, absmax, halfH, offsetY, start, end) {\n        this.drawLineToContext(\n            this.waveCtx,\n            peaks,\n            absmax,\n            halfH,\n            offsetY,\n            start,\n            end\n        );\n\n        if (this.hasProgressCanvas) {\n            this.drawLineToContext(\n                this.progressCtx,\n                peaks,\n                absmax,\n                halfH,\n                offsetY,\n                start,\n                end\n            );\n        }\n    }\n\n    /**\n     * Render the actual waveform line on a `canvas` element\n     *\n     * @private\n     * @param {CanvasRenderingContext2D} ctx Rendering context of target canvas\n     * @param {number[]} peaks Array with peaks data\n     * @param {number} absmax Maximum peak value (absolute)\n     * @param {number} halfH Half the height of the waveform\n     * @param {number} offsetY Offset to the top\n     * @param {number} start The x-offset of the beginning of the area that\n     * should be rendered\n     * @param {number} end The x-offset of the end of the area that\n     * should be rendered\n     */\n    drawLineToContext(ctx, peaks, absmax, halfH, offsetY, start, end) {\n        if (!ctx) {\n            return;\n        }\n\n        const length = peaks.length / 2;\n        const first = Math.round(length * this.start);\n\n        // use one more peak value to make sure we join peaks at ends -- unless,\n        // of course, this is the last canvas\n        const last = Math.round(length * this.end) + 1;\n\n        const canvasStart = first;\n        const canvasEnd = last;\n        const scale = this.wave.width / (canvasEnd - canvasStart - 1);\n\n        // optimization\n        const halfOffset = halfH + offsetY;\n        const absmaxHalf = absmax / halfH;\n\n        ctx.beginPath();\n        ctx.moveTo((canvasStart - first) * scale, halfOffset);\n\n        ctx.lineTo(\n            (canvasStart - first) * scale,\n            halfOffset - Math.round((peaks[2 * canvasStart] || 0) / absmaxHalf)\n        );\n\n        let i, peak, h;\n        for (i = canvasStart; i < canvasEnd; i++) {\n            peak = peaks[2 * i] || 0;\n            h = Math.round(peak / absmaxHalf);\n            ctx.lineTo((i - first) * scale + this.halfPixel, halfOffset - h);\n        }\n\n        // draw the bottom edge going backwards, to make a single\n        // closed hull to fill\n        let j = canvasEnd - 1;\n        for (j; j >= canvasStart; j--) {\n            peak = peaks[2 * j + 1] || 0;\n            h = Math.round(peak / absmaxHalf);\n            ctx.lineTo((j - first) * scale + this.halfPixel, halfOffset - h);\n        }\n\n        ctx.lineTo(\n            (canvasStart - first) * scale,\n            halfOffset -\n                Math.round((peaks[2 * canvasStart + 1] || 0) / absmaxHalf)\n        );\n\n        ctx.closePath();\n        ctx.fill();\n    }\n\n    /**\n     * Destroys this entry\n     */\n    destroy() {\n        this.waveCtx = null;\n        this.wave = null;\n\n        this.progressCtx = null;\n        this.progress = null;\n    }\n\n    /**\n     * Return image data of the wave `canvas` element\n     *\n     * When using a `type` of `'blob'`, this will return a `Promise` that\n     * resolves with a `Blob` instance.\n     *\n     * @param {string} format='image/png' An optional value of a format type.\n     * @param {number} quality=0.92 An optional value between 0 and 1.\n     * @param {string} type='dataURL' Either 'dataURL' or 'blob'.\n     * @return {string|Promise} When using the default `'dataURL'` `type` this\n     * returns a data URL. When using the `'blob'` `type` this returns a\n     * `Promise` that resolves with a `Blob` instance.\n     */\n    getImage(format, quality, type) {\n        if (type === 'blob') {\n            return new Promise(resolve => {\n                this.wave.toBlob(resolve, format, quality);\n            });\n        } else if (type === 'dataURL') {\n            return this.wave.toDataURL(format, quality);\n        }\n    }\n}\n","/**\n * Caches the decoded peaks data to improve rendering speed for large audio\n *\n * Is used if the option parameter `partialRender` is set to `true`\n */\nexport default class PeakCache {\n    /**\n     * Instantiate cache\n     */\n    constructor() {\n        this.clearPeakCache();\n    }\n\n    /**\n     * Empty the cache\n     */\n    clearPeakCache() {\n        /**\n         * Flat array with entries that are always in pairs to mark the\n         * beginning and end of each subrange.  This is a convenience so we can\n         * iterate over the pairs for easy set difference operations.\n         * @private\n         */\n        this.peakCacheRanges = [];\n        /**\n         * Length of the entire cachable region, used for resetting the cache\n         * when this changes (zoom events, for instance).\n         * @private\n         */\n        this.peakCacheLength = -1;\n    }\n\n    /**\n     * Add a range of peaks to the cache\n     *\n     * @param {number} length The length of the range\n     * @param {number} start The x offset of the start of the range\n     * @param {number} end The x offset of the end of the range\n     * @return {Number.<Array[]>} Array with arrays of numbers\n     */\n    addRangeToPeakCache(length, start, end) {\n        if (length != this.peakCacheLength) {\n            this.clearPeakCache();\n            this.peakCacheLength = length;\n        }\n\n        // Return ranges that weren't in the cache before the call.\n        let uncachedRanges = [];\n        let i = 0;\n        // Skip ranges before the current start.\n        while (\n            i < this.peakCacheRanges.length &&\n            this.peakCacheRanges[i] < start\n        ) {\n            i++;\n        }\n        // If |i| is even, |start| falls after an existing range.  Otherwise,\n        // |start| falls between an existing range, and the uncached region\n        // starts when we encounter the next node in |peakCacheRanges| or\n        // |end|, whichever comes first.\n        if (i % 2 == 0) {\n            uncachedRanges.push(start);\n        }\n        while (\n            i < this.peakCacheRanges.length &&\n            this.peakCacheRanges[i] <= end\n        ) {\n            uncachedRanges.push(this.peakCacheRanges[i]);\n            i++;\n        }\n        // If |i| is even, |end| is after all existing ranges.\n        if (i % 2 == 0) {\n            uncachedRanges.push(end);\n        }\n\n        // Filter out the 0-length ranges.\n        uncachedRanges = uncachedRanges.filter((item, pos, arr) => {\n            if (pos == 0) {\n                return item != arr[pos + 1];\n            } else if (pos == arr.length - 1) {\n                return item != arr[pos - 1];\n            }\n            return item != arr[pos - 1] && item != arr[pos + 1];\n        });\n\n        // Merge the two ranges together, uncachedRanges will either contain\n        // wholly new points, or duplicates of points in peakCacheRanges.  If\n        // duplicates are detected, remove both and extend the range.\n        this.peakCacheRanges = this.peakCacheRanges.concat(uncachedRanges);\n        this.peakCacheRanges = this.peakCacheRanges\n            .sort((a, b) => a - b)\n            .filter((item, pos, arr) => {\n                if (pos == 0) {\n                    return item != arr[pos + 1];\n                } else if (pos == arr.length - 1) {\n                    return item != arr[pos - 1];\n                }\n                return item != arr[pos - 1] && item != arr[pos + 1];\n            });\n\n        // Push the uncached ranges into an array of arrays for ease of\n        // iteration in the functions that call this.\n        const uncachedRangePairs = [];\n        for (i = 0; i < uncachedRanges.length; i += 2) {\n            uncachedRangePairs.push([uncachedRanges[i], uncachedRanges[i + 1]]);\n        }\n\n        return uncachedRangePairs;\n    }\n\n    /**\n     * For testing\n     *\n     * @return {Number.<Array[]>} Array with arrays of numbers\n     */\n    getCacheRanges() {\n        const peakCacheRangePairs = [];\n        let i;\n        for (i = 0; i < this.peakCacheRanges.length; i += 2) {\n            peakCacheRangePairs.push([\n                this.peakCacheRanges[i],\n                this.peakCacheRanges[i + 1]\n            ]);\n        }\n        return peakCacheRangePairs;\n    }\n}\n","import MediaElement from './mediaelement';\n\n/**\n * MediaElementWebAudio backend: allows to load audio as HTML5 audio tag and use it with WebAudio API.\n * Setting the MediaElementWebAudio backend, there is the possibility to load audio of big dimensions, using the WebAudio API features.\n * The audio to load is an HTML5 audio tag, so you have to use the same methods of MediaElement backend for loading and playback.\n * In this way, the audio resource is not loaded entirely from server, but in ranges, since you load an HTML5 audio tag.\n * In this way, filters and other functionalities can be performed like with WebAudio backend, but without decoding\n * internally audio data, that caused crashing of the browser. You have to give also peaks, so the audio data are not decoded.\n *\n * @since 3.2.0\n */\nexport default class MediaElementWebAudio extends MediaElement {\n    /**\n     * Construct the backend\n     *\n     * @param {WavesurferParams} params Wavesurfer parameters\n     */\n    constructor(params) {\n        super(params);\n        /** @private */\n        this.params = params;\n        /** @private */\n        this.sourceMediaElement = null;\n    }\n\n    /**\n     * Initialise the backend, called in `wavesurfer.createBackend()`\n     */\n    init() {\n        this.setPlaybackRate(this.params.audioRate);\n        this.createTimer();\n        this.createVolumeNode();\n        this.createScriptNode();\n        this.createAnalyserNode();\n    }\n    /**\n     * Private method called by both `load` (from url)\n     * and `loadElt` (existing media element) methods.\n     *\n     * @param {HTMLMediaElement} media HTML5 Audio or Video element\n     * @param {number[]|Number.<Array[]>} peaks Array of peak data\n     * @private\n     */\n    _load(media, peaks) {\n        super._load(media, peaks);\n        this.createMediaElementSource(media);\n    }\n\n    /**\n     * Create MediaElementSource node\n     *\n     * @since 3.2.0\n     * @param {HTMLMediaElement} mediaElement HTML5 Audio to load\n     */\n    createMediaElementSource(mediaElement) {\n        this.sourceMediaElement = this.ac.createMediaElementSource(\n            mediaElement\n        );\n        this.sourceMediaElement.connect(this.analyser);\n    }\n}\n"],"sourceRoot":""}