Move render to a single task.

lib_ass_media/src/main/java/io/github/peerless2012/ass/media/executor/AssExecutor.kt

@@ -21,6 +21,8 @@ class AssExecutor(private val render: AssRender) {
 
     private var executorBusy = false
 
+    private val task = AssTask(render)
+
     public fun renderFrame(presentationTimeUs: Long): AssFrame? {
         var assFrame: AssFrame? = null
         if (executorBusy) {
@@ -54,24 +56,14 @@ class AssExecutor(private val render: AssRender) {
     }
 
     public fun asyncRenderFrame(presentationTimeUs: Long, callback: (AssFrame?) -> Unit) {
-        if (executorBusy) {
+        if (task.executorBusy) {
             // render thread is busy, keep last content
             callback.invoke(assFrameNotChange)
         } else {
+            task.presentationTimeUs = presentationTimeUs
+            task.callback = callback
             // execute render task
-            executor.execute{
-                executorBusy = true
-                var result: AssFrame? = null
-                try {
-                    result = render.renderFrame(presentationTimeUs / 1000, true)
-                    lastFrame = result
-                } catch (e: Exception) {
-                    result = null
-                } finally {
-                    callback.invoke(result)
-                    executorBusy = false
-                }
-            }
+            executor.execute(task)
         }
     }
 

lib_ass_media/src/main/java/io/github/peerless2012/ass/media/executor/AssTask.kt

@@ -0,0 +1,37 @@
+package io.github.peerless2012.ass.media.executor
+
+import io.github.peerless2012.ass.AssFrame
+import io.github.peerless2012.ass.AssRender
+
+/**
+ * @Author peerless2012
+ * @Email peerless2012@126.com
+ * @DateTime 6/17/25 10:24 PM
+ * @Version V1.0
+ * @Description
+ */
+class AssTask(private val render: AssRender) : Runnable {
+
+    var executorBusy = false
+
+    var presentationTimeUs: Long = 0
+
+    var callback: ((AssFrame?) -> Unit)? = null
+
+    private var lastFrame: AssFrame? = null
+
+    override fun run() {
+        executorBusy = true
+        var result: AssFrame? = null
+        try {
+            result = render.renderFrame(presentationTimeUs / 1000, true)
+            lastFrame = result
+        } catch (e: Exception) {
+            result = null
+        } finally {
+            callback?.invoke(result)
+            executorBusy = false
+            callback = null
+        }
+    }
+}