feat: add openAsset() API for loading bundled media files

mediaplayer/src/androidMain/kotlin/io/github/kdroidfilter/composemediaplayer/VideoPlayerState.android.kt

@@ -634,6 +634,13 @@ open class DefaultVideoPlayerState(
         openFromMediaItem(mediaItem, initializeplayerState)
     }
 
+    override fun openAsset(
+        fileName: String,
+        initializeplayerState: InitialPlayerState,
+    ) {
+        openUri("asset:///$fileName", initializeplayerState)
+    }
+
     private fun openFromMediaItem(
         mediaItem: MediaItem,
         initializeplayerState: InitialPlayerState,

mediaplayer/src/commonMain/kotlin/io/github/kdroidfilter/composemediaplayer/VideoPlayerState.kt

@@ -162,6 +162,20 @@ interface VideoPlayerState {
         initializeplayerState: InitialPlayerState = InitialPlayerState.PLAY,
     )
 
+    /**
+     * Opens a media file bundled with the application.
+     *
+     * On Android, plays directly from the APK's `assets/` directory via the `asset:///` URI scheme (zero-copy).
+     * On iOS, resolves the file from the app bundle via `NSBundle.mainBundle`.
+     *
+     * @param fileName the file name or relative path (e.g. `"video.mp4"` or `"videos/intro.mp4"`)
+     * @throws UnsupportedOperationException on platforms where asset loading is not yet supported
+     */
+    fun openAsset(
+        fileName: String,
+        initializeplayerState: InitialPlayerState = InitialPlayerState.PLAY,
+    ): Unit = throw UnsupportedOperationException("openAsset is not supported on this platform")
+
     // Error handling
     val error: VideoPlayerError?
 

mediaplayer/src/iosMain/kotlin/io/github/kdroidfilter/composemediaplayer/VideoPlayerState.ios.kt

@@ -742,6 +742,19 @@ open class DefaultVideoPlayerState(
         openUri(fileUrl, initializeplayerState)
     }
 
+    override fun openAsset(
+        fileName: String,
+        initializeplayerState: InitialPlayerState,
+    ) {
+        val name = fileName.substringBeforeLast(".")
+        val ext = fileName.substringAfterLast(".", "")
+        val path =
+            platform.Foundation.NSBundle.mainBundle
+                .pathForResource(name, ext.ifEmpty { null })
+                ?: throw IllegalArgumentException("Asset not found in app bundle: $fileName")
+        openUri("file://$path", initializeplayerState)
+    }
+
     override val metadata: VideoMetadata
         get() = _metadata