Java - 混合音频文件会产生不需要的白噪声

发布于 2024-11-16 20:34:18 字数 1729 浏览 3 评论 0原文

最近,我一直在尝试将 AudioInputStreams 混合在一起。在阅读这篇文章,或更重要的是 Jason Olson 的回答后,我来了这段代码:

private static AudioInputStream mixAudio(ArrayList audio) throws IOException{
    ArrayList<byte[]> byteArrays = new ArrayList();
    long size = 0;
    int pos = 0;
    for(int i = 0; i < audio.size(); i++){
        AudioInputStream temp = (AudioInputStream) audio.get(i);
        byteArrays.add(convertStream(temp));
        if(size < temp.getFrameLength()){
            size = temp.getFrameLength();
            pos = i;
        }
    }

    byte[] compiledStream = new byte[byteArrays.get(pos).length];
    for(int i = 0; i < compiledStream.length; i++){
        int byteSum = 0;
        for(int j = 0; j < byteArrays.size(); j++){
            try{
                byteSum += byteArrays.get(j)[i];
            }catch(Exception e){
                byteArrays.remove(j);
            }
        }
        compiledStream[i] = (byte) (byteSum / byteArrays.size());
    }

    return new AudioInputStream(new ByteArrayInputStream(compiledStream), ((AudioInputStream)audio.get(pos)).getFormat(), ((AudioInputStream)audio.get(pos)).getFrameLength());
}

private static byte[] convertStream(AudioInputStream stream) throws IOException{
    ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int numRead;

    while((numRead = stream.read(buffer)) != -1){
        byteStream.write(buffer, 0, numRead);
    }

    return byteStream.toByteArray();
}

这段代码非常适合混合音频文件。然而,似乎混合的音频文件越多,返回的 AudioInputStream 中出现的白噪声就越多。在格式化方面,合并的所有文件都是相同的。如果有人有任何建议/建议,请提前致谢。

Recently, I've been experimenting with mixing AudioInputStreams together. After reading this post, or more importantly Jason Olson's answer, I came up with this code:

private static AudioInputStream mixAudio(ArrayList audio) throws IOException{
    ArrayList<byte[]> byteArrays = new ArrayList();
    long size = 0;
    int pos = 0;
    for(int i = 0; i < audio.size(); i++){
        AudioInputStream temp = (AudioInputStream) audio.get(i);
        byteArrays.add(convertStream(temp));
        if(size < temp.getFrameLength()){
            size = temp.getFrameLength();
            pos = i;
        }
    }

    byte[] compiledStream = new byte[byteArrays.get(pos).length];
    for(int i = 0; i < compiledStream.length; i++){
        int byteSum = 0;
        for(int j = 0; j < byteArrays.size(); j++){
            try{
                byteSum += byteArrays.get(j)[i];
            }catch(Exception e){
                byteArrays.remove(j);
            }
        }
        compiledStream[i] = (byte) (byteSum / byteArrays.size());
    }

    return new AudioInputStream(new ByteArrayInputStream(compiledStream), ((AudioInputStream)audio.get(pos)).getFormat(), ((AudioInputStream)audio.get(pos)).getFrameLength());
}

private static byte[] convertStream(AudioInputStream stream) throws IOException{
    ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int numRead;

    while((numRead = stream.read(buffer)) != -1){
        byteStream.write(buffer, 0, numRead);
    }

    return byteStream.toByteArray();
}

This code works very well for mixing audio files. However, it seems the more audio files being mixed, the more white noise that appears in the returned AudioInputStream. All of the files being combined are identical when it comes to formatting. If anyone has any suggestions\advice, thanks in advance.

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泪是无色的血 2024-11-23 20:34:18

我可能是错的,但我认为你的问题与你弄乱了字节而不是字节的含义有关。例如,如果您使用 16 位采样率,则 2 个字节构成与幅度相对应的数字,而不仅仅是 1 个字节。所以,你最终会得到一些接近但不太正确的东西。

I could be wrong, but I think your problem has to do with the fact that you are messing with the bytes instead of what the bytes mean. For instance, if you are working with a 16 bit sampling rate, 2 bytes form the number that corresponds to the amplitude rather than just 1 byte. So, you end up getting something close but not quite right.

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