使用Java实现延迟追加音频效果的纯本地方案(不依赖FFmpeg)

ffmpeg -i input.wav -af "adelay=1000|1000" output.wav

原始音频： |========音频内容========|
延迟后音频： |------静音------|========音频内容========|

AudioInputStream originStream = AudioSystem.getAudioInputStream(new File(origin));
AudioFormat format = originStream.getFormat();

int frameSize = format.getFrameSize();
float frameRate = format.getFrameRate();
long delayFrames = (long) ((ms / 1000.0) * frameRate);
long delayBytes = delayFrames * frameSize;

byte[] silenceBuffer = new byte[(int) delayBytes];
Arrays.fill(silenceBuffer, (byte) 0);

ByteArrayInputStream silenceStream = new ByteArrayInputStream(silenceBuffer);
AudioInputStream silenceAudioStream = new AudioInputStream(silenceStream, format, delayFrames);

AudioInputStream appendedStream = new AudioInputStream(
    new SequenceInputStream(silenceAudioStream, originStream),
    format,
    silenceAudioStream.getFrameLength() + originStream.getFrameLength()
);

AudioSystem.write(appendedStream, AudioFileFormat.Type.WAVE, new File(target));

    public static void delayAppend(String origin, String target,
                                   long ms) throws IOException, UnsupportedAudioFileException {
        // 打开原始音频文件
        File originFile = new File(origin);
        AudioInputStream originStream = AudioSystem.getAudioInputStream(originFile);
        AudioFormat format = originStream.getFormat();

        // 计算延迟部分的字节长度
        int frameSize = format.getFrameSize();
        float frameRate = format.getFrameRate();
        long delayFrames = (long)((ms / 1000.0) * frameRate);
        long delayBytes = delayFrames * frameSize;

        // 创建延迟部分（静音区）
        byte[] silenceBuffer = new byte[(int)delayBytes];
        // 填充静音（所有字节为0表示无声）
        for (int i = 0; i < silenceBuffer.length; i++) {
            silenceBuffer[i] = 0;
        }

        // 创建输入流用于拼接（静音 + 原音频）
        ByteArrayInputStream silenceStream = new ByteArrayInputStream(silenceBuffer);
        AudioInputStream silenceAudioStream = new AudioInputStream(silenceStream, format, delayFrames);

        // 拼接流（顺序输入：静音 → 原音频）
        AudioInputStream appendedStream = new AudioInputStream(
            new SequenceInputStream(silenceAudioStream, originStream), format,
            silenceAudioStream.getFrameLength() + originStream.getFrameLength());

        // 写出为目标文件（WAV 格式）
        AudioSystem.write(appendedStream, AudioFileFormat.Type.WAVE, new File(target));
        // 关闭资源
        appendedStream.close();
        originStream.close();
        silenceAudioStream.close();
    }