no commit message

2020-09-17 18:40:01 +08:00
parent 4382915d09
commit d957abceaa
283 changed files with 86935 additions and 63 deletions
@@ -0,0 +1,33 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ package org.mangui.hls.utils {
+    public class PTS {
+        /* find PTS value nearest a given reference PTS value 
+         * 
+         * PTS retrieved from demux are within a range of
+         * (+/-) 2^32/90 - 1 = (+/-) 47721858
+         * when reaching upper limit, PTS will loop to lower limit
+         * this cause some issues with fragment duration calculation
+         * this method will normalize a given PTS value and output a result 
+         * that is closest to provided PTS reference value.
+         * i.e it could output values bigger than the (+/-) 2^32/90.
+         * this will avoid PTS looping issues.  
+         */
+        public static function normalize(reference : Number, value : Number) : Number {
+            var offset : Number;
+            if (reference < value) {
+                // - 2^33/90
+                offset = -95443717;
+            } else {
+                // + 2^33/90
+                offset = 95443717;
+            }
+            // 2^32 / 90
+            while (!isNaN(reference) && (Math.abs(value - reference) > 47721858)) {
+                value += offset;
+            }
+            return value;
+        }
+    }
+}