added library for audio-processing

AudioProcessing/src/main/java/org/wyrez/audio/util/Band.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2013 Darth Affe <http://wyrez.org> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.wyrez.audio.util;
+
+/**
+ * Defines a band between of two frequencies.
+ *
+ * @author Darth Affe
+ */
+public class Band {
+
+    private float lowFrequenzy;
+    private float highFrequenzy;
+
+    public Band(float lowFrequenzy, float highFrequenzy) {
+        if (lowFrequenzy <= highFrequenzy) {
+            this.lowFrequenzy = lowFrequenzy;
+            this.highFrequenzy = highFrequenzy;
+        } else {
+            this.lowFrequenzy = highFrequenzy;
+            this.highFrequenzy = lowFrequenzy;
+        }
+    }
+
+    /**
+     * Returns the lower frequency of the band.
+     *
+     * @return The frequency as float
+     */
+    public float getLowFrequenzy() {
+        return lowFrequenzy;
+    }
+
+    /**
+     * Returns the higher frequency of the band.
+     *
+     * @return The frequency as float
+     */
+    public float getHighFrequenzy() {
+        return highFrequenzy;
+    }
+}

AudioProcessing/src/main/java/org/wyrez/audio/util/EndianDataInputStream.java

@@ -0,0 +1,54 @@
+/*
+ * This Code is taken from the source provided with a tutorial by
+ * http://www.badlogicgames.com (as of 16.05.2013).
+ * The original source can be found here:
+ * http://code.google.com/p/audio-analysis/source/browse/trunk/src/com/badlogic/audio/io/EndianDataInputStream.java 
+ */
+package org.wyrez.audio.util;
+
+import java.io.DataInputStream;
+import java.io.InputStream;
+
+public class EndianDataInputStream extends DataInputStream {
+
+    public EndianDataInputStream(InputStream in) {
+        super(in);
+    }
+
+    public String read4ByteString() throws Exception {
+        byte[] bytes = new byte[4];
+        readFully(bytes);
+        return new String(bytes, "US-ASCII");
+    }
+
+    public short readShortLittleEndian() throws Exception {
+        int result = readUnsignedByte();
+        result |= readUnsignedByte() << 8;
+        return (short) result;
+    }
+
+    public int readIntLittleEndian() throws Exception {
+        int result = readUnsignedByte();
+        result |= readUnsignedByte() << 8;
+        result |= readUnsignedByte() << 16;
+        result |= readUnsignedByte() << 24;
+        return result;
+    }
+
+    public int readInt24BitLittleEndian() throws Exception {
+        int result = readUnsignedByte();
+        result |= readUnsignedByte() << 8;
+        result |= readUnsignedByte() << 16;
+        if ((result & (1 << 23)) == 8388608) {
+            result |= 0xff000000;
+        }
+        return result;
+    }
+
+    public int readInt24Bit() throws Exception {
+        int result = readUnsignedByte() << 16;
+        result |= readUnsignedByte() << 8;
+        result |= readUnsignedByte();
+        return result;
+    }
+}

AudioProcessing/src/main/java/org/wyrez/audio/util/SampleHelper.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2013 Darth Affe <http://wyrez.org> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.wyrez.audio.util;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.wyrez.audio.decoder.Decoder;
+
+/**
+ * Helper class for sample-processing.
+ *
+ * @author Darth Affe
+ */
+public class SampleHelper {
+
+    /**
+     * Converts a list of floats to an array of floats.
+     *
+     * @param samples The List to convert
+     * @returns The new float array
+     */
+    public static float[] convertToFloatArray(List<Float> samples) {
+        float[] array = new float[samples.size()];
+        for (int i = 0; i < array.length; i++) {
+            array[i] = samples.get(i);
+        }
+        return array;
+    }
+
+    /**
+     * Creates an float array with the given length containing only the one
+     * given value.
+     *
+     * @param f The value to fill the array with
+     * @param length The length of the array
+     * @returns The new array
+     */
+    public static float[] createFloatArray(float f, int length) {
+        float[] result = new float[length];
+        for (int i = 0; i < length; i++) {
+            result[i] = f;
+        }
+        return result;
+    }
+
+    /**
+     * Splits an array of floats.
+     *
+     * @param samples The source array to split
+     * @param offset The offset to split from
+     * @param length The length of the new array
+     *
+     * @retrn The new array
+     *
+     * @throws IllegalArgumentException Thrown if there aren't enough samples to
+     * proceed
+     */
+    public static float[] splitSampleArray(float[] samples, int offset, int length)
+            throws IllegalArgumentException {
+        if (offset + length > samples.length) {
+            throw new IllegalArgumentException("There aren't enough samples in order to do that");
+        }
+        float[] result = new float[length];
+        for (int i = 0, j = offset; i < length; i++, j++) {
+            result[i] = samples[j];
+        }
+        return result;
+    }
+
+    /**
+     * Reads all samples mono merged from the given decoder.
+     *
+     * @param deocder The decoder to read from
+     * @returns The float array containing the samples
+     */
+    public static float[] readAllSamples(Decoder decoder) {
+        List<Float> samples = new ArrayList<Float>();
+        float[] buffer = new float[1024];
+        while (decoder.readSamplesMergedMono(buffer) > 0) {
+            for (int i = 0; i < buffer.length; i++) {
+                samples.add(buffer[i]);
+            }
+        }
+        return convertToFloatArray(samples);
+    }
+}