Add Java example using JavaFX and JNA

4 files changed, 166 insertions, 0 deletions

diff --git a/libmpv/java/README.txt b/libmpv/java/README.txt
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+This example uses JNA to access the functions in libmpv, and places the
+video on a JavaFX Stage.  It also uses the user32 library (Windows) to get 
+the  Window ID of the Stage in order to direct the video to this window.  
+This is platform specific, but similar functions exist on other platforms.
+
+To run this example, import as a Maven project.  Create a folder "Lib" and 
+place the "mpv-1.dll" in it.
+
+It is also possible to put the dll in the "src/main/resources/win32-x86-64/lib" 
+folder.  This allows you to package multiple libraries into a target JAR and
+have JNA load the correct platform specific library automatically. 
diff --git a/libmpv/java/pom.xml b/libmpv/java/pom.xml
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+<project

+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"

+  xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

+  <modelVersion>4.0.0</modelVersion>

+  

+  <groupId>com.example.mpvtest</groupId>

+  <artifactId>mpvtest</artifactId>

+  <version>1.0.0-SNAPSHOT</version>

+    

+  <dependencies>

+    <dependency>

+      <groupId>net.java.dev.jna</groupId>

+      <artifactId>jna-platform</artifactId>

+      <version>5.3.1</version>

+    </dependency>

+    

+    <dependency>

+      <groupId>org.openjfx</groupId>

+      <artifactId>javafx-controls</artifactId>

+      <version>11.0.2</version>

+    </dependency>

+  </dependencies>

+

+  <properties>

+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

+  </properties>

+  

+  <build>

+    <plugins>

+      <plugin>

+        <groupId>org.apache.maven.plugins</groupId>

+        <artifactId>maven-compiler-plugin</artifactId>

+        <version>3.1</version>

+        <configuration>

+          <source>11</source>

+          <target>11</target>

+        </configuration>

+      </plugin>

+    </plugins>

+  </build>

+</project>
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diff --git a/libmpv/java/src/main/java/MPV.java b/libmpv/java/src/main/java/MPV.java
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+import com.sun.jna.Native;
+import com.sun.jna.Pointer;
+import com.sun.jna.Structure;
+import com.sun.jna.win32.StdCallLibrary;
+
+import java.util.List;
+
+public interface MPV extends StdCallLibrary {
+  MPV INSTANCE = Native.load("lib/mpv-1.dll", MPV.class);
+
+  /*
+   * Event ID's
+   */
+  int MPV_EVENT_END_FILE = 7;
+  int MPV_EVENT_FILE_LOADED = 8;
+  int MPV_EVENT_IDLE = 11;
+  int MPV_EVENT_TICK = 14;
+
+  long mpv_client_api_version();
+  long mpv_create();
+  int mpv_initialize(long handle);
+  int mpv_command(long handle, String[] args);
+  int mpv_command_string(long handle, String args);
+  Pointer mpv_get_property_string(long handle, String name);
+  int mpv_set_property_string(long handle, String name, String data);
+  int mpv_set_option_string(long handle, String name, String data);
+  void mpv_free(Pointer data);
+  int mpv_set_option(long handle, String name, int format, Pointer data);
+
+  mpv_event mpv_wait_event(long handle, double timeOut);
+  int mpv_request_event(long handle, int event_id, int enable);
+
+  class mpv_event extends Structure {
+    public int event_id;
+    public int error;
+    public long reply_userdata;
+    public Pointer data;
+
+    @Override
+    protected List<String> getFieldOrder() {
+      return List.of("event_id", "error", "reply_userdata", "data");
+    }
+  }
+}
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diff --git a/libmpv/java/src/main/java/SampleMPVPlayer.java b/libmpv/java/src/main/java/SampleMPVPlayer.java
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+import com.sun.jna.Pointer;
+import com.sun.jna.platform.win32.User32;
+import com.sun.jna.platform.win32.WinDef;
+import com.sun.jna.ptr.LongByReference;
+
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.paint.Color;
+import javafx.stage.Modality;
+import javafx.stage.Stage;
+import javafx.stage.StageStyle;
+
+public class SampleMPVPlayer extends Application {
+  private static final String STAGE_TITLE = "MPV video demo";
+
+  public static void main(String[] args) {
+    Application.launch(args);
+  }
+
+  @Override
+  public void start(Stage stage) throws Exception {
+    stage.setTitle(STAGE_TITLE);
+    stage.show();
+
+    Stage childStage = new Stage(StageStyle.TRANSPARENT);
+    Button button = new Button("Hello World");
+    Scene scene = new Scene(button);
+
+    button.setStyle("-fx-font-size: 50px");
+    button.setOpacity(0.5);
+
+    scene.setFill(Color.TRANSPARENT);
+
+    childStage.initModality(Modality.APPLICATION_MODAL);
+    childStage.initOwner(stage);
+    childStage.setScene(scene);
+    childStage.show();
+
+    play("https://www.youtube.com/watch?v=sFXGrTng0gQ");
+  }
+
+  private void play(String url) {
+    // Get interface to MPV DLL
+    MPV mpv = MPV.INSTANCE;
+
+    // Create MPV player instance
+    long handle = mpv.mpv_create();
+
+    // Get the native window id by looking up a window by title:
+    WinDef.HWND hwnd = User32.INSTANCE.FindWindow(null, STAGE_TITLE);
+
+    // Tell MPV on which window video should be displayed:
+    LongByReference longByReference =
+        new LongByReference(Pointer.nativeValue(hwnd.getPointer()));
+    mpv.mpv_set_option(handle, "wid", 4, longByReference.getPointer());
+
+    int error;
+
+    // Initialize MPV after setting basic options:
+    if((error = mpv.mpv_initialize(handle)) != 0) {
+      throw new IllegalStateException("Initialization failed with error: " + error);
+    }
+
+    // Load and play a video:
+    if((error = mpv.mpv_command(handle, new String[] {"loadfile", url})) != 0) {
+      throw new IllegalStateException("Playback failed with error: " + error);
+    }
+  }
+}