jme3-examples: TestWav - test code optimization

jme3-examples/src/main/java/jme3test/audio/TestWav.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009-2012 jMonkeyEngine
+ * Copyright (c) 2009-2025 jMonkeyEngine
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,32 +33,107 @@
 
 import com.jme3.app.SimpleApplication;
 import com.jme3.audio.AudioData;
+import com.jme3.audio.AudioKey;
 import com.jme3.audio.AudioNode;
 
+/**
+ * @author capdevon
+ */
 public class TestWav extends SimpleApplication {
 
-  private float time = 0;
-  private AudioNode audioSource;
+    private float time = 0;
+    private AudioNode audioSource;
+
+    public static void main(String[] args) {
+        TestWav app = new TestWav();
+        app.start();
+    }
 
-  public static void main(String[] args) {
-    TestWav test = new TestWav();
-    test.start();
-  }
+    @Override
+    public void simpleInitApp() {
+        testMaxNumChannels();
+        testFakeAudio();
+        testPlaySourceInstance();
 
-  @Override
-  public void simpleUpdate(float tpf) {
-    time += tpf;
-    if (time > 1f) {
-      audioSource.playInstance();
-      time = 0;
+        audioSource = createAudioNode("Sound/Effects/Gun.wav", AudioData.DataType.Buffer);
+        audioSource.setName("Gun");
+        audioSource.setPositional(true);
     }
 
-  }
+    @Override
+    public void simpleUpdate(float tpf) {
+        time += tpf;
+        if (time > 1f) {
+            audioSource.playInstance();
+            time = 0;
+        }
+    }
+
+    /**
+     * Creates an {@link AudioNode} for the specified audio file.
+     * This method demonstrates an alternative way to defer the creation
+     * of an AudioNode by explicitly creating and potentially pre-loading
+     * the {@link AudioData} and {@link AudioKey} before instantiating
+     * the AudioNode. This can be useful in scenarios where you want more
+     * control over the asset loading process or when the AudioData and
+     * AudioKey are already available.
+     *
+     * @param filepath The path to the audio file.
+     * @param type     The desired {@link AudioData.DataType} for the audio.
+     * @return A new {@code AudioNode} configured with the loaded audio data.
+     */
+    private AudioNode createAudioNode(String filepath, AudioData.DataType type) {
+        boolean stream = (type == AudioData.DataType.Stream);
+        boolean streamCache = true;
+        AudioKey audioKey = new AudioKey(filepath, stream, streamCache);
+        AudioData data = assetManager.loadAsset(audioKey);
+
+        AudioNode audio = new AudioNode();
+        audio.setAudioData(data, audioKey);
+        return audio;
+    }
+
+    /**
+     * WARNING: No channel available to play instance of AudioNode[status=Stopped, vol=0.1]
+     */
+    private void testMaxNumChannels() {
+        final int MAX_NUM_CHANNELS = 64;
+        for (int i = 0; i < MAX_NUM_CHANNELS + 1; i++) {
+            AudioNode audio = createAudioNode("Sound/Effects/Gun.wav", AudioData.DataType.Buffer);
+            audio.setVolume(0.1f);
+            audio.playInstance();
+        }
+    }
+
+    /**
+     * java.lang.UnsupportedOperationException: Cannot play instances of audio streams. Use play() instead.
+     * 	at com.jme3.audio.openal.ALAudioRenderer.playSourceInstance()
+     */
+    private void testPlaySourceInstance() {
+        try {
+            AudioNode nature = new AudioNode(assetManager,
+                    "Sound/Environment/Nature.ogg", AudioData.DataType.Stream);
+            audioRenderer.playSourceInstance(nature);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void testFakeAudio() {
+        /**
+         * Tests AudioRenderer.playSource() with an
+         * AudioNode lacking AudioData to observe its handling (typically discard).
+         */
+        AudioNode fakeAudio = new AudioNode() {
+            @Override
+            public String toString() {
+                // includes node name for easier identification in log messages.
+                return getName() + " (" + AudioNode.class.getSimpleName() + ")";
+            }
+        };
+        fakeAudio.setName("FakeAudio");
+        audioRenderer.playSource(fakeAudio);
+        audioRenderer.playSourceInstance(fakeAudio);
+    }
 
-  @Override
-  public void simpleInitApp() {
-    audioSource = new AudioNode(assetManager, "Sound/Effects/Gun.wav",
-            AudioData.DataType.Buffer);
-    audioSource.setLooping(false);
-  }
 }