feat: playback speed changing

apps/expo/src/hooks/player/usePlaybackSpeed.ts

@@ -0,0 +1,18 @@
+import { useCallback } from "react";
+import { useSharedValue } from "react-native-reanimated";
+
+export const usePlaybackSpeed = () => {
+  const speed = useSharedValue(1);
+
+  const changePlaybackSpeed = useCallback(
+    (newValue: number) => {
+      speed.value = newValue;
+    },
+    [speed],
+  );
+
+  return {
+    currentSpeed: speed,
+    changePlaybackSpeed,
+  } as const;
+};