/*** Create By yxl on 2018/6/5*/
public class AmrToMP3Utils {private static Logger logger =Logger.getLogger(AmrToMP3Utils.class);/*** 将amr文件输入转为mp3格式* @param file* @return*/public static InputStream amrToMP3(MultipartFile file) {String ffmpegPath = getLinuxOrWindowsFfmpegPath();Runtime runtime = Runtime.getRuntime();try {String filePath = copyFile(file.getInputStream(), file.getOriginalFilename());String substring = filePath.substring(0, filePath.lastIndexOf("."));String mp3FilePath = substring + ".mp3";//执行ffmpeg文件，将amr格式转为mp3//filePath ----> amr文件在临时文件夹中的地址//mp3FilePath  ----> 转换后的mp3文件地址Process p = runtime.exec(ffmpegPath + "ffmpeg -i " + filePath + " " + mp3FilePath);//执行ffmpeg.exe,前面是ffmpeg.exe的地址，中间是需要转换的文件地址，后面是转换后的文件地址。-i是转换方式，意思是可编码解码，mp3编码方式采用的是libmp3lame//释放进程
            p.getOutputStream().close();p.getInputStream().close();p.getErrorStream().close();p.waitFor();File mp3File = new File(mp3FilePath);InputStream fileInputStream = new FileInputStream(mp3File);//应该在调用该方法的地方关闭该input流（使用完后），并且要删除掉临时文件夹下的相应文件/*File amrFile = new File(filePath);File mp3File = new File(mp3FilePath);if (amrFile.exists()) {boolean delete = amrFile.delete();System.out.println("删除源文件："+delete);}if (mp3File.exists()) {boolean delete = mp3File.delete();System.out.println("删除mp3文件："+delete);}*/return fileInputStream;} catch (Exception e) {e.printStackTrace();} finally {runtime.freeMemory();}return null;}/*** 将amr文件输入流转为mp3格式* @param inputStream  amr文件的输入流（也可以是其它的文件流）* @param fileName  文件名（包含后缀）* @return*/public static InputStream amrToMP3(InputStream inputStream, String fileName) {String ffmpegPath = getLinuxOrWindowsFfmpegPath();Runtime runtime = Runtime.getRuntime();try {String filePath = copyFile(inputStream, fileName);String substring = filePath.substring(0, filePath.lastIndexOf("."));String mp3FilePath = substring + ".mp3";//执行ffmpeg文件，将amr格式转为mp3//filePath ----> amr文件在临时文件夹中的地址//mp3FilePath  ----> 转换后的mp3文件地址Process p = runtime.exec(ffmpegPath + "ffmpeg -i" + " " +filePath + " " + mp3FilePath);//执行ffmpeg.exe,前面是ffmpeg.exe的地址，中间是需要转换的文件地址，后面是转换后的文件地址。-i是转换方式，意思是可编码解码，mp3编码方式采用的是libmp3lame//释放进程
            p.getOutputStream().close();p.getInputStream().close();p.getErrorStream().close();p.waitFor();File file = new File(mp3FilePath);InputStream fileInputStream = new FileInputStream(file);//应该在调用该方法的地方关闭该input流（使用完后），并且要删除掉临时文件夹下的相应文件/*File amrFile = new File(filePath);File mp3File = new File(mp3FilePath);if (amrFile.exists()) {boolean delete = amrFile.delete();System.out.println("删除源文件："+delete);}if (mp3File.exists()) {boolean delete = mp3File.delete();System.out.println("删除mp3文件："+delete);}*/return fileInputStream;} catch (Exception e) {e.printStackTrace();} finally {runtime.freeMemory();}return null;}/*** 将用户输入的amr音频文件流转为音频文件并存入临时文件夹中* @param inputStream  输入流* @param fileName  文件姓名* @return  amr临时文件存放地址* @throws IOException*/private static String copyFile(InputStream inputStream, String fileName) throws IOException {Properties props = System.getProperties();String filePath = props.getProperty("user.home") + File.separator + "MP3TempFile"; //创建临时目录File dir = new File(filePath);if (!dir.exists()) {dir.mkdir();}String outPutFile = dir + File.separator + fileName;OutputStream outputStream = new FileOutputStream(outPutFile);int bytesRead;byte[] buffer = new byte[8192];while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {outputStream.write(buffer, 0, bytesRead);}outputStream.flush();outputStream.close();inputStream.close();return outPutFile;}/*** 判断系统是Windows还是linux并且拼接ffmpegPath* @return*/private static String getLinuxOrWindowsFfmpegPath() {String ffmpegPath = "";String osName = System.getProperties().getProperty("os.name");if (osName.toLowerCase().indexOf("linux") >= 0) {ffmpegPath = "";} else {URL url = Thread.currentThread().getContextClassLoader().getResource("ffmpeg/windows/");if (url != null) {ffmpegPath = url.getFile();}}return ffmpegPath;}
}