1 files changed, 81 insertions, 0 deletions
diff --git a/src/test/java/com/jsyn/unitgen/TestDelay.java b/src/test/java/com/jsyn/unitgen/TestDelay.java
new file mode 100644
index 0000000..7e1a0b1
--- /dev/null
+++ b/src/test/java/com/jsyn/unitgen/TestDelay.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2009 Phil Burk, Mobileer Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.jsyn.unitgen;
+
+import com.jsyn.util.AudioStreamReader;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TestDelay extends NonRealTimeTestCase {
+
+    @Test
+    public void testFloor() {
+        double x = -7.3;
+        int n = (int) Math.floor(x);
+        assertEquals(-8, n, "int");
+    }
+
+    public void checkInterpolatingDelay(int maxFrames, double delayFrames)
+            throws InterruptedException {
+        synthesisEngine.start();
+
+        System.out.printf("test delayFrames = %7.5f\n", delayFrames);
+        InterpolatingDelay delay = new InterpolatingDelay();
+        synthesisEngine.add(delay);
+        delay.allocate(maxFrames);
+        delay.delay.set(delayFrames / 44100.0);
+        SawtoothOscillator osc = new SawtoothOscillator();
+        synthesisEngine.add(osc);
+        osc.frequency.set(synthesisEngine.getFrameRate() / 4.0);
+        osc.amplitude.set(1.0);
+        osc.output.connect(delay.input);
+
+        int samplesPerFrame = 1;
+        AudioStreamReader reader = new AudioStreamReader(synthesisEngine, samplesPerFrame);
+        delay.output.connect(reader.getInput());
+
+        delay.start();
+        for (int i = 0; i < (3 * maxFrames); i++) {
+            if (reader.available() == 0) {
+                synthesisEngine.sleepFor(0.01);
+            }
+            double actual = reader.read();
+            double expected = 1 + i - delayFrames;
+            if (expected < 0.0) {
+                expected = 0.0;
+            }
+            // System.out.printf( "[%d] expected = %7.3f, delayed = %7.3f\n", i, expected, actual );
+            // assertEquals(expected, actual, 0.00001, "delayed output");
+        }
+    }
+
+    @Test
+    public void testSmall() throws InterruptedException {
+        checkInterpolatingDelay(40, 7.0);
+    }
+
+    @Test
+    public void testEven() throws InterruptedException {
+        checkInterpolatingDelay(44100, 13671.0);
+    }
+
+    @Test
+    public void testInterpolatingDelay() throws InterruptedException {
+        checkInterpolatingDelay(44100, 13671.4);
+    }
+}