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
