1 files changed, 85 insertions, 0 deletions
diff --git a/src/main/java/com/jsyn/util/AudioStreamReader.java b/src/main/java/com/jsyn/util/AudioStreamReader.java
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+++ b/src/main/java/com/jsyn/util/AudioStreamReader.java
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+/*
+ * Copyright 2010 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.util;
+
+import com.jsyn.Synthesizer;
+import com.jsyn.io.AudioFifo;
+import com.jsyn.io.AudioInputStream;
+import com.jsyn.ports.UnitInputPort;
+import com.jsyn.unitgen.MonoStreamWriter;
+import com.jsyn.unitgen.StereoStreamWriter;
+import com.jsyn.unitgen.UnitStreamWriter;
+
+/**
+ * Reads audio signals from the background engine to a foreground application through an AudioFifo.
+ * Connect to the input port returned by getInput().
+ * 
+ * @author Phil Burk (C) 2010 Mobileer Inc
+ */
+public class AudioStreamReader implements AudioInputStream {
+    private UnitStreamWriter streamWriter;
+    private AudioFifo fifo;
+
+    public AudioStreamReader(Synthesizer synth, int samplesPerFrame) {
+        if (samplesPerFrame == 1) {
+            streamWriter = new MonoStreamWriter();
+        } else if (samplesPerFrame == 2) {
+            streamWriter = new StereoStreamWriter();
+        } else {
+            throw new IllegalArgumentException("Only 1 or 2 samplesPerFrame supported.");
+        }
+        synth.add(streamWriter);
+
+        fifo = new AudioFifo();
+        fifo.setWriteWaitEnabled(!synth.isRealTime());
+        fifo.setReadWaitEnabled(true);
+        fifo.allocate(32 * 1024);
+        streamWriter.setOutputStream(fifo);
+        streamWriter.start();
+    }
+
+    public UnitInputPort getInput() {
+        return streamWriter.input;
+    }
+
+    /** How many values are available to read without blocking? */
+    @Override
+    public int available() {
+        return fifo.available();
+    }
+
+    @Override
+    public void close() {
+        fifo.close();
+    }
+
+    @Override
+    public double read() {
+        return fifo.read();
+    }
+
+    @Override
+    public int read(double[] buffer) {
+        return fifo.read(buffer);
+    }
+
+    @Override
+    public int read(double[] buffer, int start, int count) {
+        return fifo.read(buffer, start, count);
+    }
+
+}