合并的说法有歧义，为了方便大家搜索到这里，所以用这个标题，实际上是连接（concat），可以理解为字符串concat方法所指定的含义。
AudioConcat.java源码
* AudioConcat.java * * This file is part of jsresources.org */ /* * Copyright (c) 1999 - 2001 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 gnu.getopt.Getopt; import javax.sound.sampled.AudioFileFormat; import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; /* If the compilation fails because this class is not available, get gnu.getopt from the URL given in the comment below. */ // TODO: the name AudioConcat is no longer appropriate. There should be a name that is neutral to concat/mix. /** <titleabbrev>AudioConcat</titleabbrev> <title>Concatenating or mixing audio files</title> <formalpara><title>Purpose</title> <para>This program reads multiple audio files and writes a single one either containing the data of all the other files in order (concatenation mode, option <option>-c</option>) or containing a mixdown of all the other files (mixing mode, option <option>-m</option>). For concatenation, the input files must have the same audio format. They need not have the same file type.</para> </formalpara> <formalpara><title>Usage</title> <para> <cmdsynopsis> <command>java AudioConcat</command> <arg choice="plain"><option>-h</option></arg> </cmdsynopsis> <cmdsynopsis> <command>java AudioConcat</command> <arg choice="opt"><option>-D</option></arg> <group choice="plain"> <arg><option>-c</option></arg> <arg><option>-m</option></arg> </group> <arg choice="plain"><option>-o <replaceable>outputfile</replaceable></option></arg> <arg choice="plain" rep="repeat"><replaceable>inputfile</replaceable></arg> </cmdsynopsis> </para> </formalpara> <formalpara><title>Parameters</title> <variablelist> <varlistentry> <term><option>-c</option></term> <listitem><para>selects concatenation mode</para></listitem> </varlistentry> <varlistentry> <term><option>-m</option></term> <listitem><para>selects mixing mode</para></listitem> </varlistentry> <varlistentry> <term><option>-o <replaceable>outputfile</replaceable></option></term> <listitem><para>The filename of the output file</para></listitem> </varlistentry> <varlistentry> <term><replaceable>inputfile</replaceable></term> <listitem><para>the name(s) of input file(s)</para></listitem> </varlistentry> </variablelist> </formalpara> <formalpara><title>Bugs, limitations</title> <para> This program is not well-tested. Output is always a WAV file. Future versions should be able to convert different audio formats to a dedicated target format. </para></formalpara> <formalpara><title>Source code</title> <para> <ulink url="AudioConcat.java.html">AudioConcat.java</ulink>, <ulink url="SequenceAudioInputStream.java.html">SequenceAudioInputStream.java</ulink>, <ulink url="MixingAudioInputStream.java.html">MixingAudioInputStream.java</ulink>, <ulink url="http://www.urbanophile.com/arenn/hacking/download.html">gnu.getopt.Getopt</ulink> </para> </formalpara> */ public class AudioConcat { private static final int MODE_NONE = 0; private static final int MODE_MIXING = 1; private static final int MODE_CONCATENATION = 2; /** Flag for debugging messages. * If true, some messages are dumped to the console * during operation. */ private static boolean DEBUG = false; public static void main(String[] args) { /** Mode of operation. Determines what to do with the input files: either mixing or concatenation. */ int nMode = MODE_NONE; String strOutputFilename = null; AudioFormat audioFormat = null; List audioInputStreamList = new ArrayList(); // int nExternalBufferSize = DEFAULT_EXTERNAL_BUFFER_SIZE; // int nInternalBufferSize = AudioSystem.NOT_SPECIFIED; /* * Parsing of command-line options takes place... */ Getopt g = new Getopt("AudioConcat", args, "hDcmo:"); int c; while ((c = g.getopt()) != -1) { switch (c) { case 'h': printUsageAndExit(); case 'o': strOutputFilename = g.getOptarg(); if (DEBUG) { out("AudioConcat.main(): output filename: " + strOutputFilename); } break; case 'c': nMode = MODE_CONCATENATION; break; case 'm': nMode = MODE_MIXING; break; case 'D': DEBUG = true; break; case '?': printUsageAndExit(); default: out("AudioConcat.main(): getopt() returned " + c); break; } } /* * All remaining arguments are assumed to be filenames of * soundfiles we want to play. */ String strFilename = null; for (int i = g.getOptind(); i < args.length; i++) { strFilename = args[i]; File soundFile = new File(strFilename); /* * We have to read in the sound file. */ AudioInputStream audioInputStream = null; try { audioInputStream = AudioSystem.getAudioInputStream(soundFile); } catch (Exception e) { /* * In case of an exception, we dump the exception * including the stack trace to the console output. * Then, we exit the program. */ e.printStackTrace(); System.exit(1); } AudioFormat format = audioInputStream.getFormat(); /* The first input file determines the audio format. This stream's AudioFormat is stored. All other streams are checked against this format. */ if (audioFormat == null) { audioFormat = format; if (DEBUG) { out("AudioConcat.main(): format: " + audioFormat); } } else if ( ! audioFormat.matches(format)) { // TODO: try to convert out("AudioConcat.main(): WARNING: AudioFormats don't match"); out("AudioConcat.main(): master format: " + audioFormat); out("AudioConcat.main(): this format: " + format); } audioInputStreamList.add(audioInputStream); } if (audioFormat == null) { out("No input filenames!"); printUsageAndExit(); } AudioInputStream audioInputStream = null; switch (nMode) { case MODE_CONCATENATION: audioInputStream = new SequenceAudioInputStream(audioFormat, audioInputStreamList); break; case MODE_MIXING: audioInputStream = new MixingAudioInputStream(audioFormat, audioInputStreamList); break; default: out("you have to specify a mode (either -m or -c)."); printUsageAndExit(); } if (strOutputFilename == null) { out("you have to specify an output filename (using -o <filename>)."); printUsageAndExit(); } File outputFile = new File(strOutputFilename); try { AudioSystem.write(audioInputStream, AudioFileFormat.Type.WAVE, outputFile); } catch (IOException e) { e.printStackTrace(); } if (DEBUG) { out("AudioConcat.main(): before exit"); } System.exit(0); } private static void printUsageAndExit() { out("AudioConcat: usage:"); out(" java AudioConcat -h"); out(" java AudioConcat [-D] -c|-m -o <outputfile> <inputfile> ..."); System.exit(1); } private static void out(String strMessage) { System.out.println(strMessage); } } /*** AudioConcat.java ***/
食用方法（从main方法中拷贝出代码来测试）：
import org.junit.Test; 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; import java.io.RandomAccessFile; import java.nio.file.DirectoryStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.TreeSet; public class TestConcatAudioStream { private static final int MODE_MIXING = 1; private static final int MODE_CONCATENATION = 2; /** Flag for debugging messages. * If true, some messages are dumped to the console * during operation. */ private static boolean DEBUG = true; private static void out(String strMessage) { System.out.println(strMessage); } @Test public void testMultiReSampling2() throws IOException, UnsupportedAudioFileException { TreeSet<String> orderedFileNames = getOrderedSeqFileNames(); Iterator<String> it = orderedFileNames.iterator(); ByteOutputStream out = new ByteOutputStream(); while (it.hasNext()) { String fileName = it.next(); String _16kFileName = fileName.substring(0, fileName.lastIndexOf(".")).concat("_16k.wav"); convert(fileName,_16kFileName); RandomAccessFile raf = new RandomAccessFile(_16kFileName, "r"); raf.skipBytes(44); byte buff[] = new byte[(int) (raf.length()-44)]; raf.read(buff); out.write(buff); } WavFileGenerator generator = new WavFileGenerator(16000,16); //AudioStreamHelper.saveToFile("e:/asset/sampleRateConverter_16k.wav",out.getBytes()); generator.saveFile("e:/asset/sampleRateConverter_16k.wav",out.getBytes()); } @Test public void testMultiReSampling() throws IOException { TreeSet<String> orderedFileNames = getOrderedSeqFileNames(); Iterator<String> it = orderedFileNames.iterator(); ByteOutputStream out = new ByteOutputStream(); while (it.hasNext()) { String fileName = it.next(); byte[] bytes = Files.readAllBytes(Paths.get(fileName)); byte[] resampled = AudioStreamHelper.reSampling2PCM(bytes); out.write(resampled); } StdAudio.play(out.toByteArray()); } void convert(String srcFile,String trgtFile) throws IOException, UnsupportedAudioFileException { float fTargetSampleRate =16000.0f; if (DEBUG) { out("target sample rate: " + fTargetSampleRate); } File sourceFile = new File(srcFile); File targetFile = new File(trgtFile); /* 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(); if (! AudioCommon.isPcm(encoding)) { 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); } /* Now, the conversion takes place. */ 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); } } @Test public void testMultiReSamplingUsingStreamConvert() throws IOException { TreeSet<String> orderedFileNames = getOrderedSeqFileNames(); Iterator<String> it = orderedFileNames.iterator(); ByteOutputStream out = new ByteOutputStream(); while (it.hasNext()) { String fileName = it.next(); byte[] bytes = Files.readAllBytes(Paths.get(fileName)); byte[] resampled = AudioStreamHelper.reSampling2PCM(bytes); out.write(resampled); } StdAudio.play(out.toByteArray()); } @Test public void test() { /** Mode of operation. Determines what to do with the input files: either mixing or concatenation. */ int nMode = MODE_CONCATENATION; String strOutputFilename = "e:\asset\48k_concatStream.wav"; AudioFormat audioFormat = null; List audioInputStreamList = new ArrayList(); /* * All remaining arguments are assumed to be filenames of * soundfiles we want to play. */ String strFilename = null; int size = getOrderedSeqFileNames().size(); Iterator<String> it = getOrderedSeqFileNames().iterator(); while (it.hasNext()){ //for (int i = 0; i < size; i++) //{ strFilename = it.next(); File soundFile = new File(strFilename); /* * We have to read in the sound file. */ AudioInputStream audioInputStream = null; try { audioInputStream = AudioSystem.getAudioInputStream(soundFile); } catch (Exception e) { /* * In case of an exception, we dump the exception * including the stack trace to the console output. * Then, we exit the program. */ e.printStackTrace(); System.exit(1); } AudioFormat format = audioInputStream.getFormat(); /* The first input file determines the audio format. This stream's AudioFormat is stored. All other streams are checked against this format. */ if (audioFormat == null) { audioFormat = format; System.out.println("AudioConcat.main(): format: " + audioFormat); } else if ( ! audioFormat.matches(format)) { // TODO: try to convert System.out.println("AudioConcat.main(): WARNING: AudioFormats don't match"); System.out.println("AudioConcat.main(): master format: " + audioFormat); System.out.println("AudioConcat.main(): this format: " + format); } audioInputStreamList.add(audioInputStream); } if (audioFormat == null) { System.out.println("No input filenames!"); } AudioInputStream audioInputStream = null; switch (nMode) { case MODE_CONCATENATION: audioInputStream = new SequenceAudioInputStream(audioFormat, audioInputStreamList); break; case MODE_MIXING: audioInputStream = new MixingAudioInputStream(audioFormat, audioInputStreamList); break; default: System.out.println("you have to specify a mode (either -m or -c)."); } if (strOutputFilename == null) { System.out.println("you have to specify an output filename (using -o <filename>)."); } File outputFile = new File(strOutputFilename); try { AudioSystem.write(audioInputStream, AudioFileFormat.Type.WAVE, outputFile); } catch (IOException e) { e.printStackTrace(); } } public TreeSet<String> getOrderedSeqFileNames() { try (DirectoryStream<Path> stream = Files.newDirectoryStream(Paths.get("E:\asset"), "*.wav")) { TreeSet<String> treeSet = new TreeSet<>(); Iterator<Path> it = stream.iterator(); while (it.hasNext()) { Path path = it.next(); String filename = path.getFileName().toString(); if (filename.matches("\d{13}\.wav") && Files.size(path) > 0) { treeSet.add(path.toString()); } } return treeSet; }catch (Exception e) {} return null; } }
本地文件如下：
testMultiReSampling2输出结果
中间生成文件
多个文件合成的文件
