SampleRateconverter.java(接近于官方源码）
输入目标采样率，输入文件，输出文件。食用方便;p
比如
SampleRateConverter.main(new String[]{"44100","f:\\temp\\32_bit_float.wav","f:\\temp\\32_bit_float_44.1K.wav"});
SampleRateConverter源码：
/* * SampleRateConverter.java * * This file is part of jsresources.org */ /* * Copyright (c) 1999 - 2003 by Matthias Pfisterer * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. */ /* |<--- this code is formatted to fit into 80 columns --->| */ import javax.sound.sampled.AudioFileFormat; import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.UnsupportedAudioFileException; import java.io.File; import java.io.IOException; /** <titleabbrev>SampleRateConverter</titleabbrev> <title>Converting the sample rate of audio files</title> <formalpara><title>Purpose</title> <para>Converts audio files, changing the sample rate of the audio data.</para> </formalpara> <formalpara><title>Usage</title> <para> <cmdsynopsis> <command>java SampleRateConverter</command> <arg choice="plain"><option>-h</option></arg> </cmdsynopsis> <cmdsynopsis> <command>java SampleRateConverter</command> <arg choice="plain"><replaceable class="parameter">targetsamplerate</replaceable></arg> <arg choice="plain"><replaceable class="parameter">sourcefile</replaceable></arg> <arg choice="plain"><replaceable class="parameter">targetfile</replaceable></arg> </cmdsynopsis> </para></formalpara> <formalpara><title>Parameters</title> <variablelist> <varlistentry> <term><option>-h</option></term> <listitem><para>prints usage information</para></listitem> </varlistentry> <varlistentry> <term><replaceable class="parameter">targetsamplerate</replaceable></term> <listitem><para>the sample rate that should be converted to</para></listitem> </varlistentry> <varlistentry> <term><replaceable class="parameter">sourcefile</replaceable></term> <listitem><para>the file name of the audio file that should be read to get the audio data to convert</para></listitem> </varlistentry> <varlistentry> <term><replaceable class="parameter">targetfile</replaceable></term> <listitem><para>the file name of the audio file that the converted audio data should be written to</para></listitem> </varlistentry> </variablelist> </formalpara> <formalpara><title>Bugs, limitations</title> <para>Sample rate conversion can only be handled natively by <ulink url="http://www.tritonus.org/">Tritonus</ulink>. If you want to do sample rate conversion with the Sun jdk1.3/1.4, you have to install Tritonus' sample rate converter. It is part of the 'Tritonus miscellaneous' plug-in. See <ulink url ="http://www.tritonus.org/plugins.html">Tritonus Plug-ins</ulink>. </para> </formalpara> <formalpara><title>Source code</title> <para> <ulink url="SampleRateConverter.java.html">SampleRateConverter.java</ulink>, <ulink url="AudioCommon.java.html">AudioCommon.java</ulink> </para> </formalpara> */ public class SampleRateConverter { /** Flag for debugging messages. * If true, some messages are dumped to the console * during operation. */ private static boolean DEBUG = true; public static void main(String[] args) throws UnsupportedAudioFileException, IOException { if (args.length == 1) { if (args[0].equals("-h")) { printUsageAndExit(); } else { printUsageAndExit(); } } else if (args.length != 3) { printUsageAndExit(); } float fTargetSampleRate = Float.parseFloat(args[0]); if (DEBUG) { out("target sample rate: " + fTargetSampleRate); } File sourceFile = new File(args[1]); File targetFile = new File(args[2]); /* We try to use the same audio file type for the target file as the source file. So we first have to find out about the source file's properties. */ AudioFileFormat sourceFileFormat = AudioSystem.getAudioFileFormat(sourceFile); AudioFileFormat.Type targetFileType = sourceFileFormat.getType(); /* Here, we are reading the source file. */ AudioInputStream sourceStream = null; sourceStream = AudioSystem.getAudioInputStream(sourceFile); if (sourceStream == null) { out("cannot open source audio file: " + sourceFile); System.exit(1); } AudioFormat sourceFormat = sourceStream.getFormat(); if (DEBUG) { out("source format: " + sourceFormat); } /* Currently, the only known and working sample rate converter for Java Sound requires that the encoding of the source stream is PCM (signed or unsigned). So as a measure of convenience, we check if this holds here. */ AudioFormat.Encoding encoding = sourceFormat.getEncoding(); //此处与官方不同 if (! (encoding.equals(AudioFormat.Encoding.PCM_SIGNED) || encoding.equals(AudioFormat.Encoding.PCM_UNSIGNED) ||encoding.equals(AudioFormat.Encoding.PCM_FLOAT))) { out("encoding of source audio data is not PCM; conversion not possible"); System.exit(1); } /* Since we now know that we are dealing with PCM, we know that the frame rate is the same as the sample rate. */ float fTargetFrameRate = fTargetSampleRate; /* Here, we are constructing the desired format of the audio data (as the result of the conversion should be). We take over all values besides the sample/frame rate. */ AudioFormat targetFormat = new AudioFormat( sourceFormat.getEncoding(), fTargetSampleRate, sourceFormat.getSampleSizeInBits(), sourceFormat.getChannels(), sourceFormat.getFrameSize(), fTargetFrameRate, sourceFormat.isBigEndian()); if (DEBUG) { out("desired target format: " + targetFormat); } /* 开始音频转换. */ AudioInputStream targetStream = AudioSystem.getAudioInputStream(targetFormat, sourceStream); if (DEBUG) { out("targetStream: " + targetStream); } /* And finally, we are trying to write the converted audio data to a new file. */ int nWrittenBytes = 0; nWrittenBytes = AudioSystem.write(targetStream, targetFileType, targetFile); if (DEBUG) { out("Written bytes: " + nWrittenBytes); } } private static void printUsageAndExit() { out("SampleRateConverter: usage:"); out("\tjava SampleRateConverter -h"); out("\tjava SampleRateConverter <targetsamplerate> <sourcefile> <targetfile>"); System.exit(1); } private static void out(String strMessage) { System.out.println(strMessage); } }
笔者在JDK1.8下面测试发现，目标编码还支持PCM_FLOAT(即pcm_f32le) 32位浮点型音频