2 files changed, 57 insertions, 12 deletions
diff --git a/src/js/plyr.js b/src/js/plyr.js
index d67fae83..be1cba4b 100644
--- a/src/js/plyr.js
+++ b/src/js/plyr.js
@@ -25,6 +25,7 @@ import { createElement, hasClass, removeElement, replaceElement, toggleClass, wr
 import { off, on, once, triggerEvent, unbindListeners } from './utils/events';
 import is from './utils/is';
 import loadSprite from './utils/loadSprite';
+import { clamp } from './utils/numbers';
 import { cloneDeep, extend } from './utils/objects';
 import { getAspectRatio, reduceAspectRatio, setAspectRatio, validateRatio } from './utils/style';
 import { parseUrl } from './utils/urls';
@@ -661,18 +662,9 @@ class Plyr {
             speed = this.config.speed.selected;
         }
 
-        // Set min/max
-        if (speed < 0.1) {
-            speed = 0.1;
-        }
-        if (speed > 2.0) {
-            speed = 2.0;
-        }
-
-        if (!this.config.speed.options.includes(speed)) {
-            this.debug.warn(`Unsupported speed (${speed})`);
-            return;
-        }
+        // Clamp to min/max
+        const { minimumSpeed: min, maximumSpeed: max } = this;
+        speed = clamp(speed, min, max);
 
         // Update config
         this.config.speed.selected = speed;
@@ -691,6 +683,42 @@ class Plyr {
     }
 
     /**
+     * Get the minimum allowed speed
+     */
+    get minimumSpeed() {
+        if (this.isYouTube) {
+            // https://developers.google.com/youtube/iframe_api_reference#setPlaybackRate
+            return Math.min(...this.options.speed);
+        }
+
+        if (this.isVimeo) {
+            // https://github.com/vimeo/player.js/#setplaybackrateplaybackrate-number-promisenumber-rangeerrorerror
+            return 0.5;
+        }
+
+        // https://stackoverflow.com/a/32320020/1191319
+        return 0.0625;
+    }
+
+    /**
+     * Get the maximum allowed speed
+     */
+    get maximumSpeed() {
+        if (this.isYouTube) {
+            // https://developers.google.com/youtube/iframe_api_reference#setPlaybackRate
+            return Math.max(...this.options.speed);
+        }
+
+        if (this.isVimeo) {
+            // https://github.com/vimeo/player.js/#setplaybackrateplaybackrate-number-promisenumber-rangeerrorerror
+            return 2;
+        }
+
+        // https://stackoverflow.com/a/32320020/1191319
+        return 16;
+    }
+
+    /**
      * Set playback quality
      * Currently HTML5 & YouTube only
      * @param {Number} input - Quality level
diff --git a/src/js/utils/numbers.js b/src/js/utils/numbers.js
new file mode 100644
index 00000000..f6eb65c8
--- /dev/null
+++ b/src/js/utils/numbers.js
@@ -0,0 +1,17 @@
+/**
+ * Returns a number whose value is limited to the given range.
+ *
+ * Example: limit the output of this computation to between 0 and 255
+ * (x * 255).clamp(0, 255)
+ *
+ * @param {Number} input
+ * @param {Number} min The lower boundary of the output range
+ * @param {Number} max The upper boundary of the output range
+ * @returns A number in the range [min, max]
+ * @type Number
+ */
+export function clamp(input = 0, min = 0, max = 255) {
+    return Math.min(Math.max(input, min), max);
+}
+
+export default { clamp };