java mp3转g722_(转载)wav文件转成g722, g729编码的文件

您好，这是一个比较具体的技术问题，需要使用特定的编码库来完成转换。以下是一个简单的Java代码示例，可以将MP3文件转换为G722编码的文件：

import java.io.*;
import javax.sound.sampled.*;

public class MP3ToG722Converter {

    public static void main(String[] args) {
        try {
            // Open the MP3 file
            File mp3File = new File("input.mp3");
            AudioInputStream mp3Stream = AudioSystem.getAudioInputStream(mp3File);

            // Convert the MP3 file to PCM format
            AudioFormat mp3Format = mp3Stream.getFormat();
            AudioFormat pcmFormat = new AudioFormat(
                AudioFormat.Encoding.PCM_SIGNED,
                mp3Format.getSampleRate(),
                16, // 16-bit sample size
                mp3Format.getChannels(),
                mp3Format.getChannels() * 2, // Frame size = 2 bytes per sample * number of channels
                mp3Format.getSampleRate(),
                false // Little-endian byte order
            );
            AudioInputStream pcmStream = AudioSystem.getAudioInputStream(pcmFormat, mp3Stream);

            // Convert the PCM format to G722 format
            AudioFormat g722Format = new AudioFormat(
                new AudioFormat.Encoding("G722"),
                pcmFormat.getSampleRate(),
                16, // 16-bit sample size
                pcmFormat.getChannels(),
                pcmFormat.getChannels() * 2, // Frame size = 2 bytes per sample * number of channels
                pcmFormat.getSampleRate(),
                false // Little-endian byte order
            );
            AudioInputStream g722Stream = AudioSystem.getAudioInputStream(g722Format, pcmStream);

            // Write the G722 data to a file
            File g722File = new File("output.g722");
            AudioSystem.write(g722Stream, AudioFileFormat.Type.WAVE, g722File);

            // Close the streams
            g722Stream.close();
            pcmStream.close();
            mp3Stream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

注意，这个示例代码只提供了MP3转G722的转换方法，如果您需要支持G729编码，需要使用相应的编码库来完成转换。