最近接到一个需求，将腾讯云的音频.acc格式的转为mp3格式

这里用到的是jave，  jave2（Java音频视频编码器）库是Java对ffmpeg的包装,它可以很方便的实现视频音频格式的转换，本文简单记录一下将wav格式的音频转换成mp3格式的音频。

实现步骤：

1.maven包导入

根据需要导入不同的包，有os、window、linux

<dependencies><dependency><groupId>ws.schild</groupId><artifactId>jave-core</artifactId><version>2.4.2</version></dependency><!--<dependency><groupId>ws.schild</groupId><artifactId>jave-native-linux64</artifactId><version>2.4.2</version></dependency>--><dependency><groupId>ws.schild</groupId><artifactId>jave-native-win64</artifactId><version>2.4.2</version></dependency><!-- <dependency><groupId>ws.schild</groupId><artifactId>jave-native-osx64</artifactId><version>2.4.2</version></dependency>-->
</dependencies>

2.代码实现

将远程下载的url复制到该工具类下面的main方法进行测试即可

package utils;import ws.schild.jave.AudioAttributes;
import ws.schild.jave.Encoder;
import ws.schild.jave.EncodingAttributes;
import ws.schild.jave.MultimediaObject;import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.net.URL;/***  音频转化工具类* @author pengjie_yao* @date 2019年12月23日11:35:20*/
public class AudioConvertUtils {/*** 根据远程资源路径，下载资源到本地临时目录** @param remoteSourceUrl 远程资源路径* @param tmpFileFolder   本地临时目录* @return 下载后的文件物理路径*/private static String downloadSource(String remoteSourceUrl, String tmpFileFolder) throws Exception {//下载资源URL url = new URL(remoteSourceUrl);DataInputStream dataInputStream = new DataInputStream(url.openStream());String tmpFilePath = tmpFileFolder + getOriginalFileName(remoteSourceUrl);FileOutputStream fileOutputStream = new FileOutputStream(new File(tmpFilePath));byte[] bytes = new byte[1024];int length = 0;while ((length = dataInputStream.read(bytes)) != -1) {fileOutputStream.write(bytes, 0, length);// System.out.println("下载中....");}// System.out.println("下载完成...");dataInputStream.close();fileOutputStream.close();return tmpFilePath;}/*** 将本地音频文件转换成mp3格式文件** @param localFilePath 本地音频文件物理路径* @param targetPath    转换后mp3文件的物理路径*/public static void changeLocalSourceToMp3(String localFilePath, String targetPath) throws Exception {File source = new File(localFilePath);MultimediaObject multimediaObject = new MultimediaObject(source);File target = new File(targetPath);AudioAttributes audio = new AudioAttributes();Encoder encoder = new Encoder();audio.setCodec("libmp3lame");EncodingAttributes attrs = new EncodingAttributes();attrs.setFormat("mp3");attrs.setAudioAttributes(audio);encoder.encode(multimediaObject, target, attrs);}/*** 下载远程文件到本地，然后转换成mp3格式，再删除下载的资源文件，并返回mp3的文件绝对路径* <p>每次会优先检测mp3文件是否已存在，存在则直接返回mp3绝对路径，否则下载然后转换成mp3再返回</p>** @param remoteSourceUrl 远程文件的URL* @param tmpFolder       临时文件存放的目录，如/usr/consult/tmp/* @return 转换成mp3的文件的绝对路径，如/usr/consult/tmp/fcd124a2-ed6c-4407-b574-81ecc51b4eb4.mp3*/public static String changeRemoteSourceToMp3(String remoteSourceUrl, String tmpFolder) throws Exception {// 检测该文件是否已经下载并转换过一次，如果是，则直接返回String remoteSourceNameWithoutSuffix = getNameWithoutSuffix(remoteSourceUrl);// 格式为/usr/consult/tmp/fcd124a2-ed6c-4407-b574-81ecc51b4eb4.mp3String mp3FilePath = tmpFolder + File.separator + remoteSourceNameWithoutSuffix + ".mp3";File audioFile = new File(mp3FilePath);if (audioFile.exists()) {// 文件已在之前转换过一次，直接返回即可return mp3FilePath;}// 下载资源到临时目录String tmpRemoteFilePath = downloadSource(remoteSourceUrl, tmpFolder);// 转换成mp3格式changeLocalSourceToMp3(tmpRemoteFilePath, mp3FilePath);// 删除.acc格式File accFile = new File(tmpRemoteFilePath);accFile.delete();return mp3FilePath;}/*** 根据文件url获取文件名（包含后缀名）** @param url 文件url* @return 文件名（包含后缀名）*/private static String getOriginalFileName(String url) {String[] sarry = url.split("/");return sarry[sarry.length - 1];}/*** 根据文件url获取文件名（不包含后缀名）** @param url 文件url* @return 文件名（包含后缀名）*/private static String getNameWithoutSuffix(String url) {String originalFileName = getOriginalFileName(url);return originalFileName.substring(0, originalFileName.indexOf("."));}public static void main(String[] args) throws Exception {String result = changeRemoteSourceToMp3("XXX", "D:\\");System.out.println(result);

}

}

github的demo例子：https://github.com/CodeBoy975/aac-to-mp3-demo.git