初步完成

docs/thumbnail/js/common.js

@@ -1,4 +1,5 @@
 (function() {
+    var $img = document.querySelector('.img');
     var $upload = document.querySelector('.upload');
     var $file = document.querySelector('.file');
     var $artplayer = document.querySelector('.artplayer');
@@ -16,34 +17,28 @@
             $artplayer.style.display = 'block';
             restartArtplayer();
         },
-        callbackThumbnailUrl: function (url) {
-            console.log(url);
-        }
+        callbackThumbnailUrl: function(url) {
+            $img.style.backgroundImage = `url(${url})`;
+        },
+        callbackDone: function(videoUrl, thumbnailUrl) {
+            restartArtplayer();
+        },
     });
 
     function restartArtplayer() {
-        var number = Number($number.value);
-        var width = Number($width.value);
-        var height = Number($height.value);
-        var column = Number($column.value);
-
         Artplayer.instances.forEach(function(art) {
             art.destroy(true);
         });
 
         var option = {
             container: $artplayer,
-            url: thumbnail.videoUrl
+            url: thumbnail.videoUrl,
         };
 
         if (thumbnail.thumbnailUrl) {
             option.thumbnails = {
                 url: thumbnail.thumbnailUrl,
-                number: number,
-                width: width,
-                height: height,
-                column: column,
-            }
+            };
         }
 
         var art = new Artplayer(option);
@@ -52,13 +47,13 @@
             var $video = art.template.$video;
             $aspectRatio.textContent = $video.videoWidth + ' x ' + $video.videoHeight;
             $duration.textContent = $video.duration + 's';
-            thumbnail.setup({
+            thumbnail.mergeOption({
                 videoElement: $video,
-                number: number,
-                width: width,
-                height: height,
-                column: column,
             });
+
+            if (!thumbnail.thumbnailUrl) {
+                thumbnail.getThumbnailUrl();
+            }
         });
     }
 })();

docs/uncompiled/artplayer-tool-thumbnail.js

@@ -74,6 +74,18 @@
     }
   }
 
+  function runPromisesInSeries(ps) {
+    return ps.reduce(function (p, next) {
+      return p.then(next);
+    }, Promise.resolve());
+  }
+
+  function sleep(ms) {
+    return new Promise(function (resolve) {
+      return setTimeout(resolve, ms);
+    });
+  }
+
   var ArtplayerToolThumbnail =
   /*#__PURE__*/
   function () {
@@ -96,13 +108,20 @@
         errorHandle(typeof option.callbackThumbnailUrl === 'function', 'This callbackThumbnailUrl is not a function');
       }
 
-      this.option = option;
-      this.init();
+      this.option = objectSpread({}, ArtplayerToolThumbnail.DEFAULTS, option);
+      this.getVideoUrl();
     }
 
     createClass(ArtplayerToolThumbnail, [{
-      key: "init",
-      value: function init() {
+      key: "mergeOption",
+      value: function mergeOption() {
+        var option = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+        this.option = objectSpread({}, this.option, option);
+        return this.option;
+      }
+    }, {
+      key: "getVideoUrl",
+      value: function getVideoUrl() {
         var _this = this;
 
         var fileType = ['video/mp4', 'video/ogg', 'video/webm'];
@@ -121,10 +140,84 @@
         });
       }
     }, {
-      key: "setup",
-      value: function setup() {
+      key: "getThumbnailUrl",
+      value: function getThumbnailUrl() {
+        var _this2 = this;
+
         var option = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
-        this.option = objectSpread({}, this.option, option);
+        this.mergeOption(option);
+        var _this$option = this.option,
+            number = _this$option.number,
+            width = _this$option.width,
+            height = _this$option.height,
+            column = _this$option.column,
+            videoElement = _this$option.videoElement,
+            callbackDone = _this$option.callbackDone;
+        var duration = videoElement.duration;
+        var timeGap = duration / number;
+        var timePoints = [timeGap];
+
+        while (timePoints.length < number) {
+          var last = timePoints[timePoints.length - 1];
+          timePoints.push(last + timeGap);
+        }
+
+        var screenshotDate = timePoints.map(function (item, index) {
+          return {
+            time: item - timeGap / 2,
+            x: index % column * width,
+            y: Math.floor(index / column) * height
+          };
+        });
+        var canvas = document.createElement('canvas');
+        canvas.width = width * column;
+        canvas.height = Math.ceil(number / column) * height;
+        var promiseList = screenshotDate.map(function (item) {
+          return _this2.getScreenshot(canvas, item);
+        });
+        runPromisesInSeries(promiseList).then(function () {
+          var thumbnailUrl = canvas.toDataURL('image/png');
+          _this2.thumbnailUrl = thumbnailUrl;
+
+          if (callbackDone) {
+            callbackDone(_this2.videoUrl, thumbnailUrl);
+          }
+        });
+      }
+    }, {
+      key: "getScreenshot",
+      value: function getScreenshot(canvas, item) {
+        var _this3 = this;
+
+        return function () {
+          var context2D = canvas.getContext('2d');
+          var _this3$option = _this3.option,
+              width = _this3$option.width,
+              height = _this3$option.height,
+              videoElement = _this3$option.videoElement,
+              delay = _this3$option.delay,
+              callbackThumbnailUrl = _this3$option.callbackThumbnailUrl;
+          videoElement.currentTime = item.time;
+          return sleep(delay).then(function () {
+            context2D.drawImage(videoElement, item.x, item.y, width, height);
+            var thumbnailUrl = canvas.toDataURL('image/png');
+
+            if (callbackThumbnailUrl) {
+              callbackThumbnailUrl(thumbnailUrl);
+            }
+          });
+        };
+      }
+    }], [{
+      key: "DEFAULTS",
+      get: function get() {
+        return {
+          delay: 300,
+          number: 60,
+          width: 160,
+          height: 90,
+          column: 10
+        };
       }
     }]);
 

packages/artplayer-tool-thumbnail/src/index.js

@@ -6,6 +6,14 @@ function errorHandle(condition, msg) {
     }
 }
 
+function runPromisesInSeries(ps) {
+    return ps.reduce((p, next) => p.then(next), Promise.resolve());
+}
+
+function sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}
+
 class ArtplayerToolThumbnail {
     constructor(option) {
         if (option.fileInput) {
@@ -30,11 +38,32 @@ class ArtplayerToolThumbnail {
             );
         }
 
-        this.option = option;
-        this.init();
+        this.option = {
+            ...ArtplayerToolThumbnail.DEFAULTS,
+            ...option,
+        };
+        this.getVideoUrl();
     }
 
-    init() {
+    static get DEFAULTS() {
+        return {
+            delay: 300,
+            number: 60,
+            width: 160,
+            height: 90,
+            column: 10,
+        };
+    }
+
+    mergeOption(option = {}) {
+        this.option = {
+            ...this.option,
+            ...option,
+        };
+        return this.option;
+    }
+
+    getVideoUrl() {
         const fileType = ['video/mp4', 'video/ogg', 'video/webm'];
         this.option.fileInput.addEventListener('change', () => {
             const file = this.option.fileInput.files[0];
@@ -49,10 +78,46 @@ class ArtplayerToolThumbnail {
         });
     }
 
-    setup(option = {}) {
-        this.option = {
-            ...this.option,
-            ...option,
+    getThumbnailUrl(option = {}) {
+        this.mergeOption(option);
+        const { number, width, height, column, videoElement, callbackDone } = this.option;
+        const { duration } = videoElement;
+        const timeGap = duration / number;
+        const timePoints = [timeGap];
+        while (timePoints.length < number) {
+            const last = timePoints[timePoints.length - 1];
+            timePoints.push(last + timeGap);
+        }
+        const screenshotDate = timePoints.map((item, index) => ({
+            time: item - timeGap / 2,
+            x: (index % column) * width,
+            y: Math.floor(index / column) * height,
+        }));
+        const canvas = document.createElement('canvas');
+        canvas.width = width * column;
+        canvas.height = Math.ceil(number / column) * height;
+        const promiseList = screenshotDate.map(item => this.getScreenshot(canvas, item));
+        runPromisesInSeries(promiseList).then(() => {
+            const thumbnailUrl = canvas.toDataURL('image/png');
+            this.thumbnailUrl = thumbnailUrl;
+            if (callbackDone) {
+                callbackDone(this.videoUrl, thumbnailUrl);
+            }
+        });
+    }
+
+    getScreenshot(canvas, item) {
+        return () => {
+            const context2D = canvas.getContext('2d');
+            const { width, height, videoElement, delay, callbackThumbnailUrl } = this.option;
+            videoElement.currentTime = item.time;
+            return sleep(delay).then(() => {
+                context2D.drawImage(videoElement, item.x, item.y, width, height);
+                const thumbnailUrl = canvas.toDataURL('image/png');
+                if (callbackThumbnailUrl) {
+                    callbackThumbnailUrl(thumbnailUrl);
+                }
+            });
         };
     }
 }