Source: ui/seek_bar.js

  1. /*! @license
  2.  * Shaka Player
  3.  * Copyright 2016 Google LLC
  4.  * SPDX-License-Identifier: Apache-2.0
  5.  */
  8. goog.provide('shaka.ui.SeekBar');
  10. goog.require('shaka.ads.Utils');
  11. goog.require('shaka.net.NetworkingEngine');
  12. goog.require('shaka.ui.Constants');
  13. goog.require('shaka.ui.Locales');
  14. goog.require('shaka.ui.Localization');
  15. goog.require('shaka.ui.RangeElement');
  16. goog.require('shaka.ui.Utils');
  17. goog.require('shaka.util.Dom');
  18. goog.require('shaka.util.Error');
  19. goog.require('shaka.util.Mp4Parser');
  20. goog.require('shaka.util.Networking');
  21. goog.require('shaka.util.Timer');
  22. goog.requireType('shaka.ui.Controls');
  25. /**
  26.  * @extends {shaka.ui.RangeElement}
  27.  * @implements {shaka.extern.IUISeekBar}
  28.  * @final
  29.  * @export
  30.  */
  31. shaka.ui.SeekBar = class extends shaka.ui.RangeElement {
  32.   /**
  33.    * @param {!HTMLElement} parent
  34.    * @param {!shaka.ui.Controls} controls
  35.    */
  36.   constructor(parent, controls) {
  37.     super(parent, controls,
  38.         [
  39.           'shaka-seek-bar-container',
  40.         ],
  41.         [
  42.           'shaka-seek-bar',
  43.           'shaka-no-propagation',
  44.           'shaka-show-controls-on-mouse-over',
  45.         ]);
  47.     /** @private {!HTMLElement} */
  48.     this.adMarkerContainer_ = shaka.util.Dom.createHTMLElement('div');
  49.     this.adMarkerContainer_.classList.add('shaka-ad-markers');
  50.     // Insert the ad markers container as a first child for proper
  51.     // positioning.
  52.     this.container.insertBefore(
  53.         this.adMarkerContainer_, this.container.childNodes[0]);
  56.     /** @private {!shaka.extern.UIConfiguration} */
  57.     this.config_ = this.controls.getConfig();
  59.     /**
  60.      * This timer is used to introduce a delay between the user scrubbing across
  61.      * the seek bar and the seek being sent to the player.
  62.      *
  63.      * @private {shaka.util.Timer}
  64.      */
  65.     this.seekTimer_ = new shaka.util.Timer(() => {
  66.       let newCurrentTime = this.getValue();
  67.       if (!this.player.isLive()) {
  68.         if (newCurrentTime == this.video.duration) {
  69.           newCurrentTime -= 0.001;
  70.         }
  71.       }
  72.       this.video.currentTime = newCurrentTime;
  73.     });
  76.     /**
  77.      * The timer is activated for live content and checks if
  78.      * new ad breaks need to be marked in the current seek range.
  79.      *
  80.      * @private {shaka.util.Timer}
  81.      */
  82.     this.adBreaksTimer_ = new shaka.util.Timer(() => {
  83.       this.markAdBreaks_();
  84.     });
  87.     /**
  88.      * When user is scrubbing the seek bar - we should pause the video - see
  89.      * https://github.com/google/shaka-player/pull/2898#issuecomment-705229215
  90.      * but will conditionally pause or play the video after scrubbing
  91.      * depending on its previous state
  92.      *
  93.      * @private {boolean}
  94.      */
  95.     this.wasPlaying_ = false;
  98.     /** @private {!HTMLElement} */
  99.     this.thumbnailContainer_ = shaka.util.Dom.createHTMLElement('div');
  100.     this.thumbnailContainer_.id = 'shaka-player-ui-thumbnail-container';
  102.     /** @private {!HTMLImageElement} */
  103.     this.thumbnailImage_ = /** @type {!HTMLImageElement} */ (
  104.       shaka.util.Dom.createHTMLElement('img'));
  105.     this.thumbnailImage_.id = 'shaka-player-ui-thumbnail-image';
  106.     this.thumbnailImage_.draggable = false;
  108.     /** @private {!HTMLElement} */
  109.     this.thumbnailTime_ = shaka.util.Dom.createHTMLElement('div');
  110.     this.thumbnailTime_.id = 'shaka-player-ui-thumbnail-time';
  112.     this.thumbnailContainer_.appendChild(this.thumbnailImage_);
  113.     this.thumbnailContainer_.appendChild(this.thumbnailTime_);
  114.     this.container.appendChild(this.thumbnailContainer_);
  116.     this.timeContainer_ = shaka.util.Dom.createHTMLElement('div');
  117.     this.timeContainer_.id = 'shaka-player-ui-time-container';
  118.     this.container.appendChild(this.timeContainer_);
  120.     /**
  121.      * @private {?shaka.extern.Thumbnail}
  122.      */
  123.     this.lastThumbnail_ = null;
  125.     /**
  126.      * @private {?shaka.net.NetworkingEngine.PendingRequest}
  127.      */
  128.     this.lastThumbnailPendingRequest_ = null;
  130.     /**
  131.      * True if the bar is moving due to touchscreen or keyboard events.
  132.      *
  133.      * @private {boolean}
  134.      */
  135.     this.isMoving_ = false;
  137.     /**
  138.      * The timer is activated to hide the thumbnail.
  139.      *
  140.      * @private {shaka.util.Timer}
  141.      */
  142.     this.hideThumbnailTimer_ = new shaka.util.Timer(() => {
  143.       this.hideThumbnail_();
  144.     });
  146.     /** @private {!Array.<!shaka.extern.AdCuePoint>} */
  147.     this.adCuePoints_ = [];
  149.     this.eventManager.listen(this.localization,
  150.         shaka.ui.Localization.LOCALE_UPDATED,
  151.         () => this.updateAriaLabel_());
  153.     this.eventManager.listen(this.localization,
  154.         shaka.ui.Localization.LOCALE_CHANGED,
  155.         () => this.updateAriaLabel_());
  157.     this.eventManager.listen(
  158.         this.adManager, shaka.ads.Utils.AD_STARTED, () => {
  159.           if (!this.shouldBeDisplayed_()) {
  160.             shaka.ui.Utils.setDisplay(this.container, false);
  161.           }
  162.         });
  164.     this.eventManager.listen(
  165.         this.adManager, shaka.ads.Utils.AD_STOPPED, () => {
  166.           if (this.shouldBeDisplayed_()) {
  167.             shaka.ui.Utils.setDisplay(this.container, true);
  168.           }
  169.         });
  171.     this.eventManager.listen(
  172.         this.adManager, shaka.ads.Utils.CUEPOINTS_CHANGED, (e) => {
  173.           this.adCuePoints_ = (e)['cuepoints'];
  174.           this.onAdCuePointsChanged_();
  175.         });
  177.     this.eventManager.listen(
  178.         this.player, 'unloading', () => {
  179.           this.adCuePoints_ = [];
  180.           this.onAdCuePointsChanged_();
  181.           if (this.lastThumbnailPendingRequest_) {
  182.             this.lastThumbnailPendingRequest_.abort();
  183.             this.lastThumbnailPendingRequest_ = null;
  184.           }
  185.           this.lastThumbnail_ = null;
  186.           this.hideThumbnail_();
  187.           this.hideTime_();
  188.         });
  190.     this.eventManager.listen(this.bar, 'mousemove', (event) => {
  191.       const rect = this.bar.getBoundingClientRect();
  192.       const min = parseFloat(this.bar.min);
  193.       const max = parseFloat(this.bar.max);
  194.       // Pixels from the left of the range element
  195.       const mousePosition = event.clientX - rect.left;
  196.       // Pixels per unit value of the range element.
  197.       const scale = (max - min) / rect.width;
  198.       // Mouse position in units, which may be outside the allowed range.
  199.       const value = Math.round(min + scale * mousePosition);
  200.       if (!this.player.getImageTracks().length) {
  201.         this.hideThumbnail_();
  202.         this.showTime_(mousePosition, value);
  203.         return;
  204.       }
  205.       this.hideTime_();
  206.       this.showThumbnail_(mousePosition, value);
  207.     });
  209.     this.eventManager.listen(this.container, 'mouseleave', () => {
  210.       this.hideTime_();
  211.       this.hideThumbnailTimer_.stop();
  212.       this.hideThumbnailTimer_.tickAfter(/* seconds= */ 0.25);
  213.     });
  215.     // Initialize seek state and label.
  216.     this.setValue(this.video.currentTime);
  217.     this.update();
  218.     this.updateAriaLabel_();
  220.     if (this.ad) {
  221.       // There was already an ad.
  222.       shaka.ui.Utils.setDisplay(this.container, false);
  223.     }
  224.   }
  226.   /** @override */
  227.   release() {
  228.     if (this.seekTimer_) {
  229.       this.seekTimer_.stop();
  230.       this.seekTimer_ = null;
  231.       this.adBreaksTimer_.stop();
  232.       this.adBreaksTimer_ = null;
  233.     }
  235.     super.release();
  236.   }
  238.   /**
  239.    * Called by the base class when user interaction with the input element
  240.    * begins.
  241.    *
  242.    * @override
  243.    */
  244.   onChangeStart() {
  245.     this.wasPlaying_ = !this.video.paused;
  246.     this.controls.setSeeking(true);
  247.     this.video.pause();
  248.     this.hideThumbnailTimer_.stop();
  249.     this.isMoving_ = true;
  250.   }
  252.   /**
  253.    * Update the video element's state to match the input element's state.
  254.    * Called by the base class when the input element changes.
  255.    *
  256.    * @override
  257.    */
  258.   onChange() {
  259.     if (!this.video.duration) {
  260.       // Can't seek yet.  Ignore.
  261.       return;
  262.     }
  264.     // Update the UI right away.
  265.     this.update();
  267.     // We want to wait until the user has stopped moving the seek bar for a
  268.     // little bit to reduce the number of times we ask the player to seek.
  269.     //
  270.     // To do this, we will start a timer that will fire in a little bit, but if
  271.     // we see another seek bar change, we will cancel that timer and re-start
  272.     // it.
  273.     //
  274.     // Calling |start| on an already pending timer will cancel the old request
  275.     // and start the new one.
  276.     this.seekTimer_.tickAfter(/* seconds= */ 0.125);
  278.     if (this.player.getImageTracks().length) {
  279.       const min = parseFloat(this.bar.min);
  280.       const max = parseFloat(this.bar.max);
  281.       const rect = this.bar.getBoundingClientRect();
  282.       const value = Math.round(this.getValue());
  283.       const scale = (max - min) / rect.width;
  284.       const position = (value - min) / scale;
  285.       this.showThumbnail_(position, value);
  286.     } else {
  287.       this.hideThumbnail_();
  288.     }
  289.   }
  291.   /**
  292.    * Called by the base class when user interaction with the input element
  293.    * ends.
  294.    *
  295.    * @override
  296.    */
  297.   onChangeEnd() {
  298.     // They just let go of the seek bar, so cancel the timer and manually
  299.     // call the event so that we can respond immediately.
  300.     this.seekTimer_.tickNow();
  301.     this.controls.setSeeking(false);
  303.     if (this.wasPlaying_) {
  304.       this.video.play();
  305.     }
  307.     if (this.isMoving_) {
  308.       this.isMoving_ = false;
  309.       this.hideThumbnailTimer_.stop();
  310.       this.hideThumbnailTimer_.tickAfter(/* seconds= */ 0.25);
  311.     }
  312.   }
  314.   /**
  315.    * @override
  316.   */
  317.   isShowing() {
  318.     // It is showing by default, so it is hidden if shaka-hidden is in the list.
  319.     return !this.container.classList.contains('shaka-hidden');
  320.   }
  322.   /**
  323.    * @override
  324.    */
  325.   update() {
  326.     const colors = this.config_.seekBarColors;
  327.     const currentTime = this.getValue();
  328.     const bufferedLength = this.video.buffered.length;
  329.     const bufferedStart = bufferedLength ? this.video.buffered.start(0) : 0;
  330.     const bufferedEnd =
  331.         bufferedLength ? this.video.buffered.end(bufferedLength - 1) : 0;
  333.     const seekRange = this.player.seekRange();
  334.     const seekRangeSize = seekRange.end - seekRange.start;
  336.     this.setRange(seekRange.start, seekRange.end);
  338.     if (!this.shouldBeDisplayed_()) {
  339.       shaka.ui.Utils.setDisplay(this.container, false);
  340.     } else {
  341.       shaka.ui.Utils.setDisplay(this.container, true);
  343.       if (bufferedLength == 0) {
  344.         this.container.style.background = colors.base;
  345.       } else {
  346.         const clampedBufferStart = Math.max(bufferedStart, seekRange.start);
  347.         const clampedBufferEnd = Math.min(bufferedEnd, seekRange.end);
  348.         const clampedCurrentTime = Math.min(
  349.             Math.max(currentTime, seekRange.start),
  350.             seekRange.end);
  352.         const bufferStartDistance = clampedBufferStart - seekRange.start;
  353.         const bufferEndDistance = clampedBufferEnd - seekRange.start;
  354.         const playheadDistance = clampedCurrentTime - seekRange.start;
  356.         // NOTE: the fallback to zero eliminates NaN.
  357.         const bufferStartFraction = (bufferStartDistance / seekRangeSize) || 0;
  358.         const bufferEndFraction = (bufferEndDistance / seekRangeSize) || 0;
  359.         const playheadFraction = (playheadDistance / seekRangeSize) || 0;
  361.         const unbufferedColor =
  362.             this.config_.showUnbufferedStart ? colors.base : colors.played;
  364.         const gradient = [
  365.           'to right',
  366.           this.makeColor_(unbufferedColor, bufferStartFraction),
  367.           this.makeColor_(colors.played, bufferStartFraction),
  368.           this.makeColor_(colors.played, playheadFraction),
  369.           this.makeColor_(colors.buffered, playheadFraction),
  370.           this.makeColor_(colors.buffered, bufferEndFraction),
  371.           this.makeColor_(colors.base, bufferEndFraction),
  372.         ];
  373.         this.container.style.background =
  374.             'linear-gradient(' + gradient.join(',') + ')';
  375.       }
  376.     }
  377.   }
  379.   /**
  380.    * @private
  381.    */
  382.   markAdBreaks_() {
  383.     if (!this.adCuePoints_.length) {
  384.       this.adMarkerContainer_.style.background = 'transparent';
  385.       this.adBreaksTimer_.stop();
  386.       return;
  387.     }
  389.     const seekRange = this.player.seekRange();
  390.     const seekRangeSize = seekRange.end - seekRange.start;
  391.     const gradient = ['to right'];
  392.     let pointsAsFractions = [];
  393.     const adBreakColor = this.config_.seekBarColors.adBreaks;
  394.     let postRollAd = false;
  395.     for (const point of this.adCuePoints_) {
  396.       // Post-roll ads are marked as starting at -1 in CS IMA ads.
  397.       if (point.start == -1 && !point.end) {
  398.         postRollAd = true;
  399.       }
  400.       // Filter point within the seek range. For points with no endpoint
  401.       // (client side ads) check that the start point is within range.
  402.       if (point.start >= seekRange.start && point.start < seekRange.end) {
  403.         if (point.end && point.end > seekRange.end) {
  404.           continue;
  405.         }
  407.         const startDist = point.start - seekRange.start;
  408.         const startFrac = (startDist / seekRangeSize) || 0;
  409.         // For points with no endpoint assume a 1% length: not too much,
  410.         // but enough to be visible on the timeline.
  411.         let endFrac = startFrac + 0.01;
  412.         if (point.end) {
  413.           const endDist = point.end - seekRange.start;
  414.           endFrac = (endDist / seekRangeSize) || 0;
  415.         }
  417.         pointsAsFractions.push({
  418.           start: startFrac,
  419.           end: endFrac,
  420.         });
  421.       }
  422.     }
  424.     pointsAsFractions = pointsAsFractions.sort((a, b) => {
  425.       return a.start - b.start;
  426.     });
  428.     for (const point of pointsAsFractions) {
  429.       gradient.push(this.makeColor_('transparent', point.start));
  430.       gradient.push(this.makeColor_(adBreakColor, point.start));
  431.       gradient.push(this.makeColor_(adBreakColor, point.end));
  432.       gradient.push(this.makeColor_('transparent', point.end));
  433.     }
  435.     if (postRollAd) {
  436.       gradient.push(this.makeColor_('transparent', 0.99));
  437.       gradient.push(this.makeColor_(adBreakColor, 0.99));
  438.     }
  439.     this.adMarkerContainer_.style.background =
  440.             'linear-gradient(' + gradient.join(',') + ')';
  441.   }
  444.   /**
  445.    * @param {string} color
  446.    * @param {number} fract
  447.    * @return {string}
  448.    * @private
  449.    */
  450.   makeColor_(color, fract) {
  451.     return color + ' ' + (fract * 100) + '%';
  452.   }
  455.   /**
  456.    * @private
  457.    */
  458.   onAdCuePointsChanged_() {
  459.     this.markAdBreaks_();
  460.     const action = () => {
  461.       const seekRange = this.player.seekRange();
  462.       const seekRangeSize = seekRange.end - seekRange.start;
  463.       const minSeekBarWindow =
  464.           shaka.ui.Constants.MIN_SEEK_WINDOW_TO_SHOW_SEEKBAR;
  465.       // Seek range keeps changing for live content and some of the known
  466.       // ad breaks might not be in the seek range now, but get into
  467.       // it later.
  468.       // If we have a LIVE seekable content, keep checking for ad breaks
  469.       // every second.
  470.       if (this.player.isLive() && seekRangeSize > minSeekBarWindow) {
  471.         this.adBreaksTimer_.tickEvery(/* seconds= */ 0.25);
  472.       }
  473.     };
  474.     if (this.player.isFullyLoaded()) {
  475.       action();
  476.     } else {
  477.       this.eventManager.listenOnce(this.player, 'loaded', action);
  478.     }
  479.   }
  482.   /**
  483.    * @return {boolean}
  484.    * @private
  485.    */
  486.   shouldBeDisplayed_() {
  487.     // The seek bar should be hidden when the seek window's too small or
  488.     // there's an ad playing.
  489.     const seekRange = this.player.seekRange();
  490.     const seekRangeSize = seekRange.end - seekRange.start;
  492.     if (this.player.isLive() &&
  493.         seekRangeSize < shaka.ui.Constants.MIN_SEEK_WINDOW_TO_SHOW_SEEKBAR) {
  494.       return false;
  495.     }
  497.     return this.ad == null || !this.ad.isLinear();
  498.   }
  500.   /** @private */
  501.   updateAriaLabel_() {
  502.     this.bar.ariaLabel = this.localization.resolve(shaka.ui.Locales.Ids.SEEK);
  503.   }
  505.   /** @private */
  506.   showTime_(pixelPosition, value) {
  507.     const offsetTop = -10;
  508.     const width = this.timeContainer_.clientWidth;
  509.     const height = 20;
  510.     this.timeContainer_.style.width = 'auto';
  511.     this.timeContainer_.style.height = height + 'px';
  512.     this.timeContainer_.style.top = -(height - offsetTop) + 'px';
  513.     const leftPosition = Math.min(this.bar.offsetWidth - width,
  514.         Math.max(0, pixelPosition - (width / 2)));
  515.     this.timeContainer_.style.left = leftPosition + 'px';
  516.     this.timeContainer_.style.visibility = 'visible';
  517.     if (this.player.isLive()) {
  518.       const seekRange = this.player.seekRange();
  519.       const totalSeconds = seekRange.end - value;
  520.       if (totalSeconds < 1) {
  521.         this.timeContainer_.textContent =
  522.             this.localization.resolve(shaka.ui.Locales.Ids.LIVE);
  523.       } else {
  524.         this.timeContainer_.textContent =
  525.             '-' + this.timeFormatter_(totalSeconds);
  526.       }
  527.     } else {
  528.       this.timeContainer_.textContent = this.timeFormatter_(value);
  529.     }
  530.   }
  533.   /**
  534.    * @private
  535.    */
  536.   async showThumbnail_(pixelPosition, value) {
  537.     const thumbnailTrack = this.getThumbnailTrack_();
  538.     if (!thumbnailTrack) {
  539.       this.hideThumbnail_();
  540.       return;
  541.     }
  542.     if (value < 0) {
  543.       value = 0;
  544.     }
  545.     const seekRange = this.player.seekRange();
  546.     const playerValue = Math.max(Math.ceil(seekRange.start),
  547.         Math.min(Math.floor(seekRange.end), value));
  548.     const thumbnail =
  549.         await this.player.getThumbnails(thumbnailTrack.id, playerValue);
  550.     if (!thumbnail || !thumbnail.uris.length) {
  551.       this.hideThumbnail_();
  552.       return;
  553.     }
  554.     if (this.player.isLive()) {
  555.       const totalSeconds = seekRange.end - value;
  556.       if (totalSeconds < 1) {
  557.         this.thumbnailTime_.textContent =
  558.             this.localization.resolve(shaka.ui.Locales.Ids.LIVE);
  559.       } else {
  560.         this.thumbnailTime_.textContent =
  561.             '-' + this.timeFormatter_(totalSeconds);
  562.       }
  563.     } else {
  564.       this.thumbnailTime_.textContent = this.timeFormatter_(value);
  565.     }
  566.     const offsetTop = -10;
  567.     const width = this.thumbnailContainer_.clientWidth;
  568.     let height = Math.floor(width * 9 / 16);
  569.     this.thumbnailContainer_.style.height = height + 'px';
  570.     this.thumbnailContainer_.style.top = -(height - offsetTop) + 'px';
  571.     const leftPosition = Math.min(this.bar.offsetWidth - width,
  572.         Math.max(0, pixelPosition - (width / 2)));
  573.     this.thumbnailContainer_.style.left = leftPosition + 'px';
  574.     this.thumbnailContainer_.style.visibility = 'visible';
  575.     let uri = thumbnail.uris[0].split('#xywh=')[0];
  576.     if (!this.lastThumbnail_ ||
  577.         uri !== this.lastThumbnail_.uris[0].split('#xywh=')[0] ||
  578.         thumbnail.segment.getStartByte() !=
  579.             this.lastThumbnail_.segment.getStartByte() ||
  580.         thumbnail.segment.getEndByte() !=
  581.             this.lastThumbnail_.segment.getEndByte()) {
  582.       this.lastThumbnail_ = thumbnail;
  583.       if (this.lastThumbnailPendingRequest_) {
  584.         this.lastThumbnailPendingRequest_.abort();
  585.         this.lastThumbnailPendingRequest_ = null;
  586.       }
  587.       if (thumbnailTrack.codecs == 'mjpg' || uri.startsWith('offline:')) {
  588.         this.thumbnailImage_.src = shaka.ui.SeekBar.Transparent_Image_;
  589.         try {
  590.           const requestType = shaka.net.NetworkingEngine.RequestType.SEGMENT;
  591.           const type =
  592.               shaka.net.NetworkingEngine.AdvancedRequestType.MEDIA_SEGMENT;
  593.           const request = shaka.util.Networking.createSegmentRequest(
  594.               thumbnail.segment.getUris(),
  595.               thumbnail.segment.getStartByte(),
  596.               thumbnail.segment.getEndByte(),
  597.               this.player.getConfiguration().streaming.retryParameters);
  598.           this.lastThumbnailPendingRequest_ = this.player.getNetworkingEngine()
  599.               .request(requestType, request, {type});
  600.           const response = await this.lastThumbnailPendingRequest_.promise;
  601.           this.lastThumbnailPendingRequest_ = null;
  602.           if (thumbnailTrack.codecs == 'mjpg') {
  603.             const parser = new shaka.util.Mp4Parser()
  604.                 .box('mdat', shaka.util.Mp4Parser.allData((data) => {
  605.                   const blob = new Blob([data], {type: 'image/jpeg'});
  606.                   uri = URL.createObjectURL(blob);
  607.                 }));
  608.             parser.parse(response.data, /* partialOkay= */ false);
  609.           } else {
  610.             const mimeType = thumbnailTrack.mimeType || 'image/jpeg';
  611.             const blob = new Blob([response.data], {type: mimeType});
  612.             uri = URL.createObjectURL(blob);
  613.           }
  614.         } catch (error) {
  615.           if (error.code == shaka.util.Error.Code.OPERATION_ABORTED) {
  616.             return;
  617.           }
  618.           throw error;
  619.         }
  620.       }
  621.       try {
  622.         this.thumbnailContainer_.removeChild(this.thumbnailImage_);
  623.       } catch (e) {
  624.         // The image is not a child
  625.       }
  626.       this.thumbnailImage_ = /** @type {!HTMLImageElement} */ (
  627.         shaka.util.Dom.createHTMLElement('img'));
  628.       this.thumbnailImage_.id = 'shaka-player-ui-thumbnail-image';
  629.       this.thumbnailImage_.draggable = false;
  630.       this.thumbnailImage_.src = uri;
  631.       this.thumbnailImage_.onload = () => {
  632.         if (uri.startsWith('blob:')) {
  633.           URL.revokeObjectURL(uri);
  634.         }
  635.       };
  636.       this.thumbnailContainer_.insertBefore(this.thumbnailImage_,
  637.           this.thumbnailContainer_.firstChild);
  638.     }
  639.     const scale = width / thumbnail.width;
  640.     if (thumbnail.imageHeight) {
  641.       this.thumbnailImage_.height = thumbnail.imageHeight;
  642.     } else if (!thumbnail.sprite) {
  643.       this.thumbnailImage_.style.height = '100%';
  644.       this.thumbnailImage_.style.objectFit = 'contain';
  645.     }
  646.     if (thumbnail.imageWidth) {
  647.       this.thumbnailImage_.width = thumbnail.imageWidth;
  648.     } else if (!thumbnail.sprite) {
  649.       this.thumbnailImage_.style.width = '100%';
  650.       this.thumbnailImage_.style.objectFit = 'contain';
  651.     }
  652.     this.thumbnailImage_.style.left = '-' + scale * thumbnail.positionX + 'px';
  653.     this.thumbnailImage_.style.top = '-' + scale * thumbnail.positionY + 'px';
  654.     this.thumbnailImage_.style.transform = 'scale(' + scale + ')';
  655.     this.thumbnailImage_.style.transformOrigin = 'left top';
  656.     // Update container height and top
  657.     height = Math.floor(width * thumbnail.height / thumbnail.width);
  658.     this.thumbnailContainer_.style.height = height + 'px';
  659.     this.thumbnailContainer_.style.top = -(height - offsetTop) + 'px';
  660.   }
  663.   /**
  664.    * @return {?shaka.extern.Track} The thumbnail track.
  665.    * @private
  666.    */
  667.   getThumbnailTrack_() {
  668.     const imageTracks = this.player.getImageTracks();
  669.     if (!imageTracks.length) {
  670.       return null;
  671.     }
  672.     const mimeTypesPreference = [
  673.       'image/avif',
  674.       'image/webp',
  675.       'image/jpeg',
  676.       'image/png',
  677.       'image/svg+xml',
  678.     ];
  679.     for (const mimeType of mimeTypesPreference) {
  680.       const estimatedBandwidth = this.player.getStats().estimatedBandwidth;
  681.       const bestOptions = imageTracks.filter((track) => {
  682.         return track.mimeType.toLowerCase() === mimeType &&
  683.             track.bandwidth < estimatedBandwidth * 0.01;
  684.       }).sort((a, b) => {
  685.         return b.bandwidth - a.bandwidth;
  686.       });
  687.       if (bestOptions && bestOptions.length) {
  688.         return bestOptions[0];
  689.       }
  690.     }
  691.     const mjpgTrack = imageTracks.find((track) => {
  692.       return track.mimeType == 'application/mp4' && track.codecs == 'mjpg';
  693.     });
  694.     return mjpgTrack || imageTracks[0];
  695.   }
  698.   /**
  699.    * @private
  700.    */
  701.   hideThumbnail_() {
  702.     this.thumbnailContainer_.style.visibility = 'hidden';
  703.     this.thumbnailTime_.textContent = '';
  704.   }
  707.   /**
  708.    * @private
  709.    */
  710.   hideTime_() {
  711.     this.timeContainer_.style.visibility = 'hidden';
  712.   }
  715.   /**
  716.    * @param {number} totalSeconds
  717.    * @private
  718.    */
  719.   timeFormatter_(totalSeconds) {
  720.     const secondsNumber = Math.round(totalSeconds);
  721.     const hours = Math.floor(secondsNumber / 3600);
  722.     let minutes = Math.floor((secondsNumber - (hours * 3600)) / 60);
  723.     let seconds = secondsNumber - (hours * 3600) - (minutes * 60);
  724.     if (seconds < 10) {
  725.       seconds = '0' + seconds;
  726.     }
  727.     if (hours > 0) {
  728.       if (minutes < 10) {
  729.         minutes = '0' + minutes;
  730.       }
  731.       return hours + ':' + minutes + ':' + seconds;
  732.     } else {
  733.       return minutes + ':' + seconds;
  734.     }
  735.   }
  736. };
  739. /**
  740.  * @const {string}
  741.  * @private
  742.  */
  743. shaka.ui.SeekBar.Transparent_Image_ =
  744.     'data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg"/>';
  747. /**
  748.  * @implements {shaka.extern.IUISeekBar.Factory}
  749.  * @export
  750.  */
  752. shaka.ui.SeekBar.Factory = class {
  753.   /**
  754.    * Creates a shaka.ui.SeekBar. Use this factory to register the default
  755.    * SeekBar when needed
  756.    *
  757.    * @override
  758.    */
  759.   create(rootElement, controls) {
  760.     return new shaka.ui.SeekBar(rootElement, controls);
  761.   }
  762. };