made looping sample-perfect

com/danitheskunk/skunkworks/TestSound.java

@@ -30,14 +30,22 @@ public class TestSound {
 		//Node.connect(sin3, 0, mix, 1);
 		//Node.connect(sin2, 0, mix, 2);
 
+		var loop = engine.loadSample("C:\\Users\\dani\\Downloads\\AKWF" +
+			"\\AKWF_bw_sin\\AKWF_sin_0001.wav");
 		var sample = engine.loadSample("C:\\Users\\dani\\Downloads\\Untitled" +
 			".wav");
-		var player = new SamplePlayer(engine, sample);
+		var kick = engine.loadSample("C:\\samples\\drum\\legowelt\\BASEDRUMS" +
+			"\\Legowelt Basedrum 007.wav");
+		var player = new SamplePlayer(engine);
 		Node.connect(player, 0, mix, 0);
 
-		for(int i = 0; i < 500; ++i) {
-			engine.refill();
-			Thread.sleep(20);
+		player.play(loop, true);
+		for(int j = 0; j < 10; ++j) {
+			//player.play(kick);
+			for(int i = 0; i < 50; ++i) {
+				engine.refill();
+				Thread.sleep(20);
+			}
 		}
 		/*
 		for(int i = 0; i < 60; ++i) {

com/danitheskunk/skunkworks/audio/AudioEngine.java

@@ -142,11 +142,11 @@ public class AudioEngine {
 		}
 		var sample = new Samplei(bytes.length / 2 / channels, channels == 2);
 		for(int i = 0; i < bytes.length / 2 / channels; ++i) {
-			var l =
-				bytes[i * 2 * channels] + bytes[i * 2 * channels + 1] * 256;
+			var l = (bytes[i * 2 * channels] & 0xFF) +
+				(bytes[i * 2 * channels + 1] & 0xFF) * 256;
 			if(channels == 2) {
-				var r = bytes[i * 2 * channels + 2] +
-					bytes[i * 2 * channels + 3] * 256;
+				var r = (bytes[i * 2 * channels + 2] & 0xFF) +
+					(bytes[i * 2 * channels + 3] & 0xFF) * 256;
 				sample.setSamplei(i, (short) l, (short) r);
 			} else {
 				sample.setSamplei(i, (short) l);

com/danitheskunk/skunkworks/audio/nodes/SamplePlayer.java

@@ -4,26 +4,61 @@ import com.danitheskunk.skunkworks.audio.AudioBuffer;
 import com.danitheskunk.skunkworks.audio.AudioEngine;
 import com.danitheskunk.skunkworks.audio.ISample;
 
-public class SamplePlayer extends Node {
-	private ISample sample;
-	private int tick;
+import java.util.ArrayList;
+import java.util.List;
 
-	public SamplePlayer(AudioEngine engine, ISample sample) {
+public class SamplePlayer extends Node {
+	private List<PlayingSample> samples;
+
+	public SamplePlayer(AudioEngine engine) {
 		super(engine, 0, 1);
-		this.sample = sample;
-		this.tick = 0;
+		samples = new ArrayList<>();
 	}
 
 	@Override
 	public AudioBuffer getBuffer(int slot) {
 		var bufsize = getEngine().getBufferSize();
 		var buf = new AudioBuffer(bufsize);
-		for(int i = 0; i < bufsize && tick < sample.getLength(); ++i) {
-			var l = sample.getSampleLeft(tick);
-			var r = sample.getSampleRight(tick);
+		var toRemove = new ArrayList<PlayingSample>();
+		for(int i = 0; i < bufsize; ++i) {
+			double l = 0;
+			double r = 0;
+			for(var sample : samples) {
+				if(sample.loop) {
+					sample.tick %= sample.sample.getLength();
+				}
+				if(sample.tick < sample.sample.getLength()) {
+					l += sample.sample.getSampleLeft(sample.tick);
+					r += sample.sample.getSampleRight(sample.tick);
+					++sample.tick;
+				} else {
+					toRemove.add(sample);
+				}
+			}
+			for(var sample : toRemove) {
+				samples.remove(sample);
+			}
+			toRemove.clear();
 			buf.setSample(i, l, r);
-			++tick;
 		}
 		return buf;
 	}
+
+	public void play(ISample sample) {
+		play(sample, false);
+	}
+
+	public void play(ISample sample, boolean looping) {
+		var s = new PlayingSample();
+		s.sample = sample;
+		s.loop = looping;
+		s.tick = 0;
+		samples.add(s);
+	}
+
+	private static class PlayingSample {
+		ISample sample;
+		int tick;
+		boolean loop;
+	}
 }