diff options
author | Phil Burk <[email protected]> | 2014-12-30 16:53:03 -0800 |
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committer | Phil Burk <[email protected]> | 2014-12-30 16:53:03 -0800 |
commit | 534969d42ca5168d645678345cd21242fe41f389 (patch) | |
tree | e8f5d1cba1ec57685e76ceb923d8da25a7846cfb /src/com/jsyn/util/SampleLoader.java | |
parent | a4d8ca95178d2e3acfc3299a4b73e84c2646d24e (diff) |
Initial commit of code.
Diffstat (limited to 'src/com/jsyn/util/SampleLoader.java')
-rw-r--r-- | src/com/jsyn/util/SampleLoader.java | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/com/jsyn/util/SampleLoader.java b/src/com/jsyn/util/SampleLoader.java new file mode 100644 index 0000000..611a7d6 --- /dev/null +++ b/src/com/jsyn/util/SampleLoader.java @@ -0,0 +1,229 @@ +/* + * 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 com.jsyn.data.FloatSample; +import com.jsyn.util.soundfile.CustomSampleLoader; + +/** + * Load a FloatSample from various sources. The default loader uses custom code to load WAV or AIF + * files. Supported data formats are 16, 24 and 32 bit PCM, and 32-bit float. Compressed formats + * such as unsigned 8-bit, uLaw, A-Law and MP3 are not support. If you need to load one of those + * files try setJavaSoundPreferred(true). Or convert it to a supported format using Audacity or Sox + * or some other sample file tool. Here is an example of loading a sample from a file. + * + * <pre> + * <code> + * File sampleFile = new File("guitar.wav"); + * FloatSample sample = SampleLoader.loadFloatSample( sampleFile ); + * </code> + * </pre> + * + * @author Phil Burk (C) 2011 Mobileer Inc + */ +public class SampleLoader { + private static boolean javaSoundPreferred = false; + private static final String JS_LOADER_NAME = "com.jsyn.util.JavaSoundSampleLoader"; + + /** + * Try to create an implementation of AudioSampleLoader. + * + * @return A device supported on this platform. + */ + private static AudioSampleLoader createLoader() { + AudioSampleLoader loader = null; + try { + if (javaSoundPreferred) { + loader = (AudioSampleLoader) JavaTools.loadClass(JS_LOADER_NAME).newInstance(); + } else { + loader = new CustomSampleLoader(); + } + } catch (InstantiationException e) { + e.printStackTrace(); + } catch (IllegalAccessException e) { + e.printStackTrace(); + } + return loader; + } + + /** + * Load a FloatSample from a File object. + */ + public static FloatSample loadFloatSample(File fileIn) throws IOException { + AudioSampleLoader loader = SampleLoader.createLoader(); + return loader.loadFloatSample(fileIn); + } + + /** + * Load a FloatSample from an InputStream. This is handy when loading Resources from a JAR file. + */ + public static FloatSample loadFloatSample(InputStream inputStream) throws IOException { + AudioSampleLoader loader = SampleLoader.createLoader(); + return loader.loadFloatSample(inputStream); + } + + /** + * Load a FloatSample from a URL.. This is handy when loading Resources from a website. + */ + public static FloatSample loadFloatSample(URL url) throws IOException { + AudioSampleLoader loader = SampleLoader.createLoader(); + return loader.loadFloatSample(url); + } + + public static boolean isJavaSoundPreferred() { + return javaSoundPreferred; + } + + /** + * If set true then the audio file parser from JavaSound will be used. Note that JavaSound + * cannot load audio files containing floating point data. But it may be able to load some + * compressed data formats such as uLaw. + * + * @note JavaSound is not supported on Android. + * @param javaSoundPreferred + */ + public static void setJavaSoundPreferred(boolean javaSoundPreferred) { + SampleLoader.javaSoundPreferred = javaSoundPreferred; + } + + /** + * Decode 24 bit samples from a BigEndian byte array into a float array. The samples will be + * normalized into the range -1.0 to +1.0. + * + * @param audioBytes raw data from an audio file + * @param offset first element of byte array + * @param numBytes number of bytes to process + * @param data array to be filled with floats + * @param outputOffset first element of float array to be filled + */ + public static void decodeBigI24ToF32(byte[] audioBytes, int offset, int numBytes, float[] data, + int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int hi = ((audioBytes[byteCursor++]) & 0x00FF); + int mid = ((audioBytes[byteCursor++]) & 0x00FF); + int lo = ((audioBytes[byteCursor++]) & 0x00FF); + int value = (hi << 24) | (mid << 16) | (lo << 8); + data[floatCursor++] = value * (1.0f / Integer.MAX_VALUE); + } + } + + public static void decodeBigI16ToF32(byte[] audioBytes, int offset, int numBytes, float[] data, + int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int hi = ((audioBytes[byteCursor++]) & 0x00FF); + int lo = ((audioBytes[byteCursor++]) & 0x00FF); + short value = (short) ((hi << 8) | lo); + data[floatCursor++] = value * (1.0f / 32768); + } + } + + public static void decodeBigF32ToF32(byte[] audioBytes, int offset, int numBytes, float[] data, + int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int bits = audioBytes[byteCursor++]; + bits = (bits << 8) | ((audioBytes[byteCursor++]) & 0x00FF); + bits = (bits << 8) | ((audioBytes[byteCursor++]) & 0x00FF); + bits = (bits << 8) | ((audioBytes[byteCursor++]) & 0x00FF); + data[floatCursor++] = Float.intBitsToFloat(bits); + } + } + + public static void decodeBigI32ToF32(byte[] audioBytes, int offset, int numBytes, float[] data, + int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int value = audioBytes[byteCursor++]; // MSB + value = (value << 8) | ((audioBytes[byteCursor++]) & 0x00FF); + value = (value << 8) | ((audioBytes[byteCursor++]) & 0x00FF); + value = (value << 8) | ((audioBytes[byteCursor++]) & 0x00FF); + data[floatCursor++] = value * (1.0f / Integer.MAX_VALUE); + } + } + + public static void decodeLittleF32ToF32(byte[] audioBytes, int offset, int numBytes, + float[] data, int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int bits = ((audioBytes[byteCursor++]) & 0x00FF); // LSB + bits += ((audioBytes[byteCursor++]) & 0x00FF) << 8; + bits += ((audioBytes[byteCursor++]) & 0x00FF) << 16; + bits += (audioBytes[byteCursor++]) << 24; + data[floatCursor++] = Float.intBitsToFloat(bits); + } + } + + public static void decodeLittleI32ToF32(byte[] audioBytes, int offset, int numBytes, + float[] data, int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int value = ((audioBytes[byteCursor++]) & 0x00FF); + value += ((audioBytes[byteCursor++]) & 0x00FF) << 8; + value += ((audioBytes[byteCursor++]) & 0x00FF) << 16; + value += (audioBytes[byteCursor++]) << 24; + data[floatCursor++] = value * (1.0f / Integer.MAX_VALUE); + } + } + + public static void decodeLittleI24ToF32(byte[] audioBytes, int offset, int numBytes, + float[] data, int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int lo = ((audioBytes[byteCursor++]) & 0x00FF); + int mid = ((audioBytes[byteCursor++]) & 0x00FF); + int hi = ((audioBytes[byteCursor++]) & 0x00FF); + int value = (hi << 24) | (mid << 16) | (lo << 8); + data[floatCursor++] = value * (1.0f / Integer.MAX_VALUE); + } + } + + public static void decodeLittleI16ToF32(byte[] audioBytes, int offset, int numBytes, + float[] data, int outputOffset) { + int lastByte = offset + numBytes; + int byteCursor = offset; + int floatCursor = outputOffset; + while (byteCursor < lastByte) { + int lo = ((audioBytes[byteCursor++]) & 0x00FF); + int hi = ((audioBytes[byteCursor++]) & 0x00FF); + short value = (short) ((hi << 8) | lo); + float sample = value * (1.0f / 32768); + data[floatCursor++] = sample; + } + } + +} |