Merge pull request #2 from elong4321/feature/filters

fix(composer): 补充提交TimeScaleFilter

Author: duweiwang

lib-gles/src/main/java/com/example/lib_gles/video_filter/core/filter/TimeScaleFilter.java

@@ -0,0 +1,28 @@
+package com.example.lib_gles.video_filter.core.filter;
+
+/**
+ * A marker filter for timeline speed control.
+ * It keeps pass-through rendering behavior while exposing a desired timescale.
+ */
+public class TimeScaleFilter extends GlFilter {
+
+    private final double timeScale;
+
+    public TimeScaleFilter(double timeScale) {
+        super();
+        if (timeScale <= 0) {
+            throw new IllegalArgumentException("timeScale must be > 0");
+        }
+        this.timeScale = timeScale;
+    }
+
+    @Override
+    public double resolveTimeScaleAtMs(long presentationTimeMs) {
+        return timeScale;
+    }
+
+    @Override
+    public boolean hasTimeScaleControl() {
+        return true;
+    }
+}