纯Java实现高效MP3音频合并的详细方案

ffmpeg -i "concat:1.mp3|2.mp3|3.mp3" -acodec copy output.mp3

AudioInputStream mp3Stream = AudioSystem.getAudioInputStream(mp3File);
AudioFormat decodedFormat = new AudioFormat(
    AudioFormat.Encoding.PCM_SIGNED,
    baseFormat.getSampleRate(),
    16,
    baseFormat.getChannels(),
    baseFormat.getChannels() * 2,
    baseFormat.getSampleRate(),
    false
);
AudioInputStream decodedStream = AudioSystem.getAudioInputStream(decodedFormat, mp3Stream);

public int read(byte[] b, int off, int len) throws IOException {
    int bytesRead = currentStream.read(b, off, len);
    if (bytesRead == -1) switchToNextFile();
    return bytesRead;
}

AudioSystem.write(outputStream, AudioFileFormat.Type.WAVE, outputFile);

<dependency>
    <groupId>javazoom</groupId>
    <artifactId>jlayer</artifactId>
    <version>1.0.1</version>
</dependency>
<dependency>
    <groupId>com.googlecode.soundlibs</groupId>
    <artifactId>mp3spi</artifactId>
    <version>1.9.5.4</version>
</dependency>

src
 ├── main/java/com/example/audio/
 │    ├── AudioMp3Merger.java     # 主工具类
 │    └── ConcatenatedAudioInputStream.java  # 拼接流
 └── resources/
      └── logback.xml

List<File> files = List.of(
    new File("input/1.mp3"),
    new File("input/2.mp3")
);
AudioMp3Merger.mergeMp3("output/merged.wav", files);