jellyfin-media-player/native/jellyscrubPlugin.js

class jellyscrubPlugin {
    constructor({ playbackManager, events, ServerConnections }) {
        this.name = 'Jellyscrub Plugin';
        this.type = 'input';
        this.id = 'jellyscrubPlugin';

        (async() => {
            await window.initCompleted;
            const enabled = window.jmpInfo.settings.plugins.jellyscrub;

            console.log("JellyScrub Plugin enabled: " + enabled);
            if (!enabled) return;

            // Copied from https://github.com/nicknsy/jellyscrub/blob/main/Nick.Plugin.Jellyscrub/Api/trickplay.js
            // Adapted for use in JMP
            const MANIFEST_ENDPOINT = '/Trickplay/{itemId}/GetManifest';
            const BIF_ENDPOINT = '/Trickplay/{itemId}/{width}/GetBIF';
            const RETRY_INTERVAL = 60_000;  // ms (1 minute)
            
            let mediaSourceId = null;
            let mediaRuntimeTicks = null;   // NOT ms -- Microsoft DateTime.Ticks. Must be divided by 10,000.
                    
            let hasFailed = false;
            let trickplayManifest = null;
            let trickplayData = null;
            let currentTrickplayFrame = null;
            
            let hiddenSliderBubble = null;
            let customSliderBubble = null;
            let customThumbImg = null;
            let customChapterText = null;
            
            let osdPositionSlider = null;
            let osdOriginalBubbleHtml = null;
            let osdGetBubbleHtml = null;
            let osdGetBubbleHtmlLock = false;
            
            /*
            * Utility methods
            */
            
            const LOG_PREFIX  = '[jellyscrub] ';
            
            function debug(msg) {
                console.debug(LOG_PREFIX + msg);
            }
            
            function error(msg) {
                console.error(LOG_PREFIX + msg);
            }
            
            function info(msg) {
                console.info(LOG_PREFIX + msg);
            }
            
            /*
            * Get config values
            */
            
            // -- ApiClient hasn't loaded by this point... :(
            // -- Also needs to go in async function
            //const jellyscrubConfig = await ApiClient.getPluginConfiguration(JELLYSCRUB_GUID);
            //let STYLE_TRICKPLAY_CONTAINER = jellyscrubConfig.StyleTrickplayContainer ?? true;
            let STYLE_TRICKPLAY_CONTAINER = true;
            
            /*
            * Inject style to be used for slider bubble popup
            */
            
            if (STYLE_TRICKPLAY_CONTAINER) {
                let jellyscrubStyle = document.createElement('style');
                jellyscrubStyle.id = 'jellscrubStyle';
                jellyscrubStyle.textContent += '.chapterThumbContainer {width: 15vw; overflow: hidden;}';
                jellyscrubStyle.textContent += '.chapterThumb {width: 100%; display: block; height: unset; min-height: unset; min-width: unset;}';
                jellyscrubStyle.textContent += '.chapterThumbTextContainer {position: relative; background: rgb(38, 38, 38); text-align: center;}';
                jellyscrubStyle.textContent += '.chapterThumbText {margin: 0; opacity: unset; padding: unset;}';
                document.body.appendChild(jellyscrubStyle);
            }
            
            /*
            * Monitor current page to be used for trickplay load/unload
            */
            
            let videoPath = 'playback/video/index.html';
            let previousRoutePath = null;
            
            document.addEventListener('viewshow', function () {
                let currentRoutePath = Emby.Page.currentRouteInfo.route.path;
            
                if (currentRoutePath == videoPath) {
                    loadVideoView();
                } else if (previousRoutePath == videoPath) {
                    unloadVideoView();
                }
            
                previousRoutePath = currentRoutePath;
            });
            
            let sliderConfig = { attributeFilter: ['style', 'class'] };
            let sliderObserver = new MutationObserver(sliderCallback);
            
            function sliderCallback(mutationList, observer) {
                if (!customSliderBubble || !trickplayData) return;
            
                for (const mutation of mutationList) {
                    switch (mutation.attributeName) {
                        case 'style':
                            customSliderBubble.setAttribute('style', mutation.target.getAttribute('style'));
                            break;
                        case 'class':
                            if (mutation.target.classList.contains('hide')) {
                                customSliderBubble.classList.add('hide');
                            } else {
                                customSliderBubble.classList.remove('hide');
                            }
                            break;
                    }
                }
            }
            
            function loadVideoView() {
                debug('!!!!!!! Loading video view !!!!!!!');
            
                let slider = document.getElementsByClassName('osdPositionSlider')[0];
                if (slider) {
                    osdPositionSlider = slider;
                    debug(`Found OSD slider: ${osdPositionSlider}`);
            
                    osdOriginalBubbleHtml = osdPositionSlider.getBubbleHtml;
                    osdGetBubbleHtml = osdOriginalBubbleHtml;
            
                    Object.defineProperty(osdPositionSlider, 'getBubbleHtml', {
                        get() { return osdGetBubbleHtml },
                        set(value) { if (!osdGetBubbleHtmlLock) osdGetBubbleHtml = value; },
                        configurable: true,
                        enumerable: true
                    });
            
                    let bubble = document.getElementsByClassName('sliderBubble')[0];
                    if (bubble) {
                        hiddenSliderBubble = bubble;
            
                        let customBubble = document.createElement('div');
                        customBubble.classList.add('sliderBubble', 'hide');
            
                        let customThumbContainer = document.createElement('div');
                        customThumbContainer.classList.add('chapterThumbContainer');
            
                        customThumbImg = document.createElement('img');
                        customThumbImg.classList.add('chapterThumb');
                        customThumbImg.src = 'data:,';
                        // Fix for custom styles that set radius on EVERYTHING causing weird holes when both img and text container are rounded
                        if (STYLE_TRICKPLAY_CONTAINER) customThumbImg.setAttribute('style', 'border-radius: unset !important;')
                        customThumbContainer.appendChild(customThumbImg);
            
                        let customChapterTextContainer = document.createElement('div');
                        customChapterTextContainer.classList.add('chapterThumbTextContainer');
                        // Fix for custom styles that set radius on EVERYTHING causing weird holes when both img and text container are rounded
                        if (STYLE_TRICKPLAY_CONTAINER) customChapterTextContainer.setAttribute('style', 'border-radius: unset !important;')
            
                        customChapterText = document.createElement('h2');
                        customChapterText.classList.add('chapterThumbText');
                        customChapterText.textContent = '--:--';
                        customChapterTextContainer.appendChild(customChapterText);
            
                        customThumbContainer.appendChild(customChapterTextContainer);
                        customBubble.appendChild(customThumbContainer);
                        customSliderBubble = hiddenSliderBubble.parentElement.appendChild(customBubble);
            
                        sliderObserver.observe(hiddenSliderBubble, sliderConfig);
                    }
            
                    // Main execution will first by triggered by the load video view method, but later (e.g. in the case of TV series)
                    // will be triggered by the playback request interception
                    if (!hasFailed && !trickplayData && mediaSourceId && mediaRuntimeTicks
                        && osdPositionSlider && hiddenSliderBubble && customSliderBubble) mainScriptExecution();
                }
            }
            
            function unloadVideoView() {
                debug('!!!!!!! Unloading video view !!!!!!!');
            
                // Clear old values
                clearTimeout(mainScriptExecution);
            
                mediaSourceId = null;
                mediaRuntimeTicks = null;
                    
                hasFailed = false;
                trickplayManifest = null;
                trickplayData = null;
                currentTrickplayFrame = null;
            
                hiddenSliderBubble = null;
                customSliderBubble = null;
                customThumbImg = null;
                customChapterText = null;
            
                osdPositionSlider = null;
                osdOriginalBubbleHtml = null;
                osdGetBubbleHtml = null;
                osdGetBubbleHtmlLock = false;
                // Clear old values
            }
            
            /*
            * Update mediaSourceId, runtime, and emby auth data
            */

            function onPlayback(e, player, state) {
                if (state.NowPlayingItem) {
                    mediaRuntimeTicks = state.NowPlayingItem.RunTimeTicks;
                    mediaSourceId = state.NowPlayingItem.Id;

                    changeCurrentMedia();
                }
            };
            events.on(playbackManager, 'playbackstart', onPlayback);
            
            function changeCurrentMedia() {
                // Reset trickplay-related variables
                hasFailed = false;
                trickplayManifest = null;
                trickplayData = null;
                currentTrickplayFrame = null;
            
                // Set bubble html back to default
                if (osdOriginalBubbleHtml) osdGetBubbleHtml = osdOriginalBubbleHtml;
                osdGetBubbleHtmlLock = false;
            
                // Main execution will first by triggered by the load video view method, but later (e.g. in the case of TV series)
                // will be triggered by the playback request interception
                if (!hasFailed && !trickplayData && mediaSourceId && mediaRuntimeTicks
                    && osdPositionSlider && hiddenSliderBubble && customSliderBubble) mainScriptExecution();
            }
            
            /*
            * Indexed UInt8Array
            */
            
            function Indexed8Array(buffer) {
                this.index = 0;
                this.array = new Uint8Array(buffer);
            }
            
            Indexed8Array.prototype.read = function(len) {
                if (len) {
                    const readData = [];
                    for (let i = 0; i < len; i++) {
                        readData.push(this.array[this.index++]);
                    }
            
                    return readData;
                } else {
                    return this.array[this.index++];
                }
            }
            
            Indexed8Array.prototype.readArbitraryInt = function(len) {
                let num = 0;
                for (let i = 0; i < len; i++) {
                    num += this.read() << (i << 3);
                }
            
                return num;
            }
            
            Indexed8Array.prototype.readInt32 = function() {
                return this.readArbitraryInt(4);
            }
            
            /*
            * Code for BIF/Trickplay frames
            */
            
            const BIF_MAGIC_NUMBERS = [0x89, 0x42, 0x49, 0x46, 0x0D, 0x0A, 0x1A, 0x0A];
            const SUPPORTED_BIF_VERSION = 0;
            
            function trickplayDecode(buffer) {
                info(`BIF file size: ${(buffer.byteLength / 1_048_576).toFixed(2)}MB`);
            
            
                let bifArray = new Indexed8Array(buffer);
                for (let i = 0; i < BIF_MAGIC_NUMBERS.length; i++) {
                    if (bifArray.read() != BIF_MAGIC_NUMBERS[i]) {
                        error('Attempted to read invalid bif file.');
                        error(buffer);
                        return null;
                    }
                }
            
                let bifVersion = bifArray.readInt32();
                if (bifVersion != SUPPORTED_BIF_VERSION) {
                    error(`Client only supports BIF v${SUPPORTED_BIF_VERSION} but file is v${bifVersion}`);
                    return null;
                }
            
                let bifImgCount = bifArray.readInt32();
                info(`BIF image count: ${bifImgCount}`);
            
                let timestampMultiplier = bifArray.readInt32();
                if (timestampMultiplier == 0) timestampMultiplier = 1000;
            
                bifArray.read(44); // Reserved
            
                let bifIndex = [];
                for (let i = 0; i < bifImgCount; i++) {
                    bifIndex.push({
                        timestamp: bifArray.readInt32(),
                        offset: bifArray.readInt32()
                    });
                }
            
                let bifImages = [];
                let indexEntry;
                for (let i = 0; i < bifIndex.length; i++) {
                    indexEntry = bifIndex[i];
                    const timestamp = indexEntry.timestamp;
                    const offset = indexEntry.offset;
                    const nextOffset = bifIndex[i + 1] ? bifIndex[i + 1].offset : buffer.length;
            
                    bifImages[timestamp] = buffer.slice(offset, nextOffset);
                }
                
                return {
                    version: bifVersion,
                    timestampMultiplier: timestampMultiplier,
                    imageCount: bifImgCount,
                    images: bifImages
                };
            }
            
            function getTrickplayFrame(playerTimestamp, data) {
                const multiplier = data.timestampMultiplier;
                const images = data.images;
            
                const frame = Math.floor(playerTimestamp / multiplier);
                return images[frame];
            }
            
            function getTrickplayFrameUrl(playerTimestamp, data) {
                let bufferImage = getTrickplayFrame(playerTimestamp, data);
            
                if (bufferImage) {
                    return URL.createObjectURL(new Blob([bufferImage], {type: 'image/jpeg'}));
                }
            }
            
            /*
            * Main script execution -- not actually run first
            */
            
            function manifestLoad() {
                if (this.status == 200) {
                    if (!this.response) {
                        error(`Received 200 status from manifest endpoint but a null response. (RESPONSE URL: ${this.responseURL})`);
                        hasFailed = true;
                        return;
                    }
            
                    trickplayManifest = this.response;
                    setTimeout(mainScriptExecution, 0); // Hacky way of avoiding using fetch/await by returning then calling function again
                } else if (this.status == 503) {
                    info(`Received 503 from server -- still generating manifest. Waiting ${RETRY_INTERVAL}ms then retrying...`);
                    setTimeout(mainScriptExecution, RETRY_INTERVAL);
                } else {
                    debug(`Failed to get manifest file: url ${this.responseURL}, error ${this.status}, ${this.responseText}`)
                    hasFailed = true;
                }
            }
            
            function bifLoad() {
                if (this.status == 200) {
                    if (!this.response) {
                        error(`Received 200 status from BIF endpoint but a null response. (RESPONSE URL: ${this.responseURL})`);
                        hasFailed = true;
                        return;
                    }
            
                    trickplayData = trickplayDecode(this.response);
                    setTimeout(mainScriptExecution, 0); // Hacky way of avoiding using fetch/await by returning then calling function again
                } else if (this.status == 503) {
                    info(`Received 503 from server -- still generating BIF. Waiting ${RETRY_INTERVAL}ms then retrying...`);
                    setTimeout(mainScriptExecution, RETRY_INTERVAL);
                } else {
                    if (this.status == 404) error('Requested BIF file listed in manifest but server returned 404 not found.');
            
                    debug(`Failed to get BIF file: url ${this.responseURL}, error ${this.status}, ${this.responseText}`)
                    hasFailed = true;
                }
            }
            
            function getServerUrl() {
                const apiClient = ServerConnections
                    ? ServerConnections.currentApiClient()
                    : window.ApiClient;
                return apiClient.serverAddress();
            }

            function assignAuth(request) {
                const apiClient = ServerConnections
                    ? ServerConnections.currentApiClient()
                    : window.ApiClient;

                const address = apiClient.serverAddress();


                request.setRequestHeader('Authorization', `MediaBrowser Token=${apiClient.accessToken()}`);
            }

            function mainScriptExecution() {
                // Get trickplay manifest file
                if (!trickplayManifest) {
                    let manifestUrl = getServerUrl() + MANIFEST_ENDPOINT.replace('{itemId}', mediaSourceId);
                    console.log(manifestUrl)
                    let manifestRequest = new XMLHttpRequest();
                    manifestRequest.responseType = 'json';
                    manifestRequest.addEventListener('load', manifestLoad);
            
                    manifestRequest.open('GET', manifestUrl);
                    assignAuth(manifestRequest);
            
                    debug(`Requesting Manifest @ ${manifestUrl}`);
                    manifestRequest.send();
                    return;
                }
            
                // Get trickplay BIF file
                if (!trickplayData && trickplayManifest) {
                    // Determine which width to use
                    // Prefer highest resolution @ less than 20% of total screen resolution width
                    let resolutions = trickplayManifest.WidthResolutions;
            
                    if (resolutions && resolutions.length > 0)
                    {
                        resolutions.sort();
                        let screenWidth = window.screen.width * window.devicePixelRatio;
                        let width = resolutions[0];
            
                        // Prefer bigger trickplay images granted they are less than or equal to 20% of total screen width
                        for (let i = 1; i < resolutions.length; i++)
                        {
                            let biggerWidth = resolutions[i];
                            if (biggerWidth <= (screenWidth * .2)) width = biggerWidth;
                        }
                        info(`Requesting BIF file with width ${width}`);
            
                        let bifUrl = getServerUrl() + BIF_ENDPOINT.replace('{itemId}', mediaSourceId).replace('{width}', width);
                        let bifRequest = new XMLHttpRequest();
                        bifRequest.responseType = 'arraybuffer';
                        bifRequest.addEventListener('load', bifLoad);
            
                        bifRequest.open('GET', bifUrl);
                        assignAuth(bifRequest);
            
                        debug(`Requesting BIF @ ${bifUrl}`);
                        bifRequest.send();
                        return;
                    } else {
                        error(`Have manifest file with no listed resolutions: ${trickplayManifest}`);
                    }
                }
            
                // Set the bubble function to our custom trickplay one
                if (trickplayData) {
                    osdPositionSlider.getBubbleHtml = getBubbleHtmlTrickplay;
                    osdGetBubbleHtmlLock = true;
                }
            }
            
            function getBubbleHtmlTrickplay(sliderValue) {
                //showOsd();
            
                let currentTicks = mediaRuntimeTicks * (sliderValue / 100);
                let currentTimeMs = currentTicks / 10_000
                let imageSrc = getTrickplayFrameUrl(currentTimeMs, trickplayData);
            
                if (imageSrc) {
                    if (currentTrickplayFrame) URL.revokeObjectURL(currentTrickplayFrame);
                    currentTrickplayFrame = imageSrc;
            
                    customThumbImg.src = imageSrc;
                    customChapterText.textContent = getDisplayRunningTime(currentTicks);
                }
            
                return `<div style="min-width: ${customSliderBubble.offsetWidth}px; max-height: 0px"></div>`;
            }
            
            // Not the same, but should be functionally equaivalent to --
            // https://github.com/jellyfin/jellyfin-web/blob/8ff9d63e25b40575e02fe638491259c480c89ba5/src/controllers/playback/video/index.js#L237
            /*
            function showOsd() {
                //document.getElementsByClassName('skinHeader')[0]?.classList.remove('osdHeader-hidden');
                // todo: actually can't be bothered so I'll wait and see if it works without it or not
            }
            */
            
            // Taken from https://github.com/jellyfin/jellyfin-web/blob/8ff9d63e25b40575e02fe638491259c480c89ba5/src/scripts/datetime.js#L76
            function getDisplayRunningTime(ticks) {
                const ticksPerHour = 36000000000;
                const ticksPerMinute = 600000000;
                const ticksPerSecond = 10000000;
            
                const parts = [];
            
                let hours = ticks / ticksPerHour;
                hours = Math.floor(hours);
            
                if (hours) {
                    parts.push(hours);
                }
            
                ticks -= (hours * ticksPerHour);
            
                let minutes = ticks / ticksPerMinute;
                minutes = Math.floor(minutes);
            
                ticks -= (minutes * ticksPerMinute);
            
                if (minutes < 10 && hours) {
                    minutes = '0' + minutes;
                }
                parts.push(minutes);
            
                let seconds = ticks / ticksPerSecond;
                seconds = Math.floor(seconds);
            
                if (seconds < 10) {
                    seconds = '0' + seconds;
                }
                parts.push(seconds);
            
                return parts.join(':');
            }
        })();
    }
}

window._jellyscrubPlugin = jellyscrubPlugin;