java mp3文件生成lrc文件

生成LRC文件需要对MP3文件进行解析，提取出歌词信息。Java中可以使用第三方库来实现这一功能，如`jAudiotagger`和`jlrc`。

下面是一个简单的示例代码，使用`jAudiotagger`库从MP3文件中提取出歌词信息并生成LRC文件：

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import org.jaudiotagger.audio.AudioFile;
import org.jaudiotagger.audio.AudioFileIO;
import org.jaudiotagger.tag.FieldKey;
import org.jaudiotagger.tag.Tag;
import org.jaudiotagger.tag.datatype.Lyrics3Line;
import org.jaudiotagger.tag.id3.AbstractID3v2Frame;
import org.jaudiotagger.tag.id3.ID3v24Tag;

public class Mp3ToLrcConverter {

    public static void main(String[] args) throws Exception {
        File mp3File = new File("path/to/mp3/file.mp3");
        File lrcFile = new File("path/to/lrc/file.lrc");
        convertMp3ToLrc(mp3File, lrcFile);
    }

    public static void convertMp3ToLrc(File mp3File, File lrcFile) throws Exception {
        AudioFile audioFile = AudioFileIO.read(mp3File);
        Tag tag = audioFile.getTag();

        // Check if the MP3 file has embedded lyrics
        if (tag != null) {
            String lyrics = tag.getFirst(FieldKey.LYRICS);
            if (lyrics != null && !lyrics.isEmpty()) {
                writeLrcFile(lrcFile, lyrics);
                return;
            }
        }

        // If the MP3 file doesn't have embedded lyrics, try to extract them from ID3v2 tags
        if (audioFile instanceof org.jaudiotagger.audio.mp3.MP3File) {
            org.jaudiotagger.audio.mp3.MP3File mp3 = (org.jaudiotagger.audio.mp3.MP3File) audioFile;
            ID3v24Tag id3v2Tag = mp3.getID3v2TagAsv24();
            if (id3v2Tag != null) {
                AbstractID3v2Frame lyricsFrame = id3v2Tag.getFirst("USLT");
                if (lyricsFrame != null) {
                    String lyrics = lyricsFrame.getContent();
                    writeLrcFile(lrcFile, lyrics);
                    return;
                }
            }
        }

        // If the MP3 file doesn't have embedded lyrics or ID3v2 tags, try to extract them from Lyrics3 tags
        if (audioFile.hasLyrics3Tag()) {
            Lyrics3Line lyrics3Line = audioFile.getLyrics3Tag().getLine(0);
            if (lyrics3Line != null) {
                String lyrics = lyrics3Line.getLyric();
                writeLrcFile(lrcFile, lyrics);
                return;
            }
        }

        // If the MP3 file doesn't have any embedded lyrics, throw an exception
        throw new Exception("No lyrics found in the MP3 file.");
    }

    public static void writeLrcFile(File lrcFile, String lyrics) throws IOException {
        try (FileWriter writer = new FileWriter(lrcFile)) {
            writer.write(lyrics);
        }
    }
}

这段代码会首先检查MP3文件是否有内嵌歌词，如果有则直接生成LRC文件。如果没有内嵌歌词，则尝试从ID3v2标签或Lyrics3标签中提取歌词信息，最后将歌词信息写入LRC文件。如果无法提取歌词信息，则抛出异常。