1 files changed, 149 insertions, 0 deletions
diff --git a/src/main/java/com/jsyn/util/JavaSoundSampleLoader.java b/src/main/java/com/jsyn/util/JavaSoundSampleLoader.java
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+++ b/src/main/java/com/jsyn/util/JavaSoundSampleLoader.java
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+/*
+ * Copyright 2011 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 java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioInputStream;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.UnsupportedAudioFileException;
+
+import com.jsyn.data.FloatSample;
+
+/**
+ * Internal class for loading audio samples. Use SampleLoader instead.
+ * 
+ * @author Phil Burk (C) 2011 Mobileer Inc
+ */
+class JavaSoundSampleLoader implements AudioSampleLoader {
+    /**
+     * Load a FloatSample from a File object.
+     */
+    @Override
+    public FloatSample loadFloatSample(File fileIn) throws IOException {
+        try {
+            return loadFloatSample(AudioSystem.getAudioInputStream(fileIn));
+        } catch (UnsupportedAudioFileException e) {
+            throw new IOException(e);
+        }
+    }
+
+    /**
+     * Load a FloatSample from an InputStream. This is handy when loading Resources from a JAR file.
+     */
+    @Override
+    public FloatSample loadFloatSample(InputStream inputStream) throws IOException {
+        try {
+            return loadFloatSample(AudioSystem.getAudioInputStream(inputStream));
+        } catch (UnsupportedAudioFileException e) {
+            throw new IOException(e);
+        }
+    }
+
+    /**
+     * Load a FloatSample from a URL.. This is handy when loading Resources from a website.
+     */
+    @Override
+    public FloatSample loadFloatSample(URL url) throws IOException {
+        try {
+            return loadFloatSample(AudioSystem.getAudioInputStream(url));
+        } catch (UnsupportedAudioFileException e) {
+            throw new IOException(e);
+        }
+    }
+
+    private FloatSample loadFloatSample(javax.sound.sampled.AudioInputStream audioInputStream)
+            throws IOException, UnsupportedAudioFileException {
+        float[] floatData = null;
+        FloatSample sample = null;
+        int bytesPerFrame = audioInputStream.getFormat().getFrameSize();
+        if (bytesPerFrame == AudioSystem.NOT_SPECIFIED) {
+            // some audio formats may have unspecified frame size
+            // in that case we may read any amount of bytes
+            bytesPerFrame = 1;
+        }
+        AudioFormat format = audioInputStream.getFormat();
+        if (format.getEncoding() == AudioFormat.Encoding.PCM_SIGNED) {
+            floatData = loadSignedPCM(audioInputStream);
+        }
+        sample = new FloatSample(floatData, format.getChannels());
+        sample.setFrameRate(format.getFrameRate());
+        return sample;
+    }
+
+    private float[] loadSignedPCM(AudioInputStream audioInputStream) throws IOException,
+            UnsupportedAudioFileException {
+        int totalSamplesRead = 0;
+        AudioFormat format = audioInputStream.getFormat();
+        int numFrames = (int) audioInputStream.getFrameLength();
+        int numSamples = format.getChannels() * numFrames;
+        float[] data = new float[numSamples];
+        final int bytesPerFrame = format.getFrameSize();
+        // Set an arbitrary buffer size of 1024 frames.
+        int numBytes = 1024 * bytesPerFrame;
+        byte[] audioBytes = new byte[numBytes];
+        int numBytesRead = 0;
+        int numFramesRead = 0;
+        // Try to read numBytes bytes from the file.
+        while ((numBytesRead = audioInputStream.read(audioBytes)) != -1) {
+            int bytesRemainder = numBytesRead % bytesPerFrame;
+            if (bytesRemainder != 0) {
+                // TODO Read until you get enough data.
+                throw new IOException("Read partial block of sample data!");
+            }
+
+            if (audioInputStream.getFormat().getSampleSizeInBits() == 16) {
+                if (format.isBigEndian()) {
+                    SampleLoader.decodeBigI16ToF32(audioBytes, 0, numBytesRead, data,
+                            totalSamplesRead);
+                } else {
+                    SampleLoader.decodeLittleI16ToF32(audioBytes, 0, numBytesRead, data,
+                            totalSamplesRead);
+                }
+            } else if (audioInputStream.getFormat().getSampleSizeInBits() == 24) {
+                if (format.isBigEndian()) {
+                    SampleLoader.decodeBigI24ToF32(audioBytes, 0, numBytesRead, data,
+                            totalSamplesRead);
+                } else {
+                    SampleLoader.decodeLittleI24ToF32(audioBytes, 0, numBytesRead, data,
+                            totalSamplesRead);
+                }
+            } else if (audioInputStream.getFormat().getSampleSizeInBits() == 32) {
+                if (format.isBigEndian()) {
+                    SampleLoader.decodeBigI32ToF32(audioBytes, 0, numBytesRead, data,
+                            totalSamplesRead);
+                } else {
+                    SampleLoader.decodeLittleI32ToF32(audioBytes, 0, numBytesRead, data,
+                            totalSamplesRead);
+                }
+            } else {
+                throw new UnsupportedAudioFileException(
+                        "Only 16, 24 or 32 bit PCM samples supported.");
+            }
+
+            // Calculate the number of frames actually read.
+            numFramesRead = numBytesRead / bytesPerFrame;
+            totalSamplesRead += numFramesRead * format.getChannels();
+        }
+        return data;
+    }
+
+}