获取Java中的音频文件的波形 [英] Obtain wave pattern of a audio file in Java

问题描述

我不知道我怎么可能会获得音乐信息，如从音频文件的幅度？

I'm wondering how I may obtain musical information such as amplitude from a audio file?

假设我们有一个原始音频文件，我想从它让我产生一个曲线，如<一个文件中抽取数据什么href=\"http://www1.icsi.berkeley.edu/Speech/mr/nearfar.html\">http://www1.icsi.berkeley.edu/Speech/mr/nearfar.html.一旦我获得这条曲线，我会进行FFT等。

Suppose we have a raw audio file, what I want to extract data from the file which allows me to generate a curve such as http://www1.icsi.berkeley.edu/Speech/mr/nearfar.html. Once I have obtained this curve, I will perform FFT, etc.

我一直在试图寻找在Java的声音解决方案，但我只知道到目前为止，我可以倒数据到字节[] 使用的AudioInputStream 。
但我怎么翻译的字节[] 到双[] ，其中包含有关声音的实际信息？在这种情况下，在值双重[] 重新present 幅度。

I have been trying to search for solutions in Java Sound, but what I only know so far is that I can pour the data into byte[] using AudioInputStream. But how do I translate that byte[] into a double[] which contains actual information about the sound? In this case, the values in the double[] represent amplitude.

任何人都可以请提供一个解决方案在Java中解决这个问题？

Could anyone please provide a solution to solve this problem in Java?

推荐答案

典型的wav文件是16位的小端，所以你可以把每两个连续字节，B1和B2，并获得幅度如下：

Typical wav file is 16 bit little endian, so you can take each two consecutive bytes, b1 and b2, and get the amplitude as follows:

(double) (b2 << 8 | b1 & 0xFF) / 32767.0;

如果输入是立体声的，前两个字节将左声道，然后右声道的两个字节。

if the input is stereo, first two bytes would be left channel, then two bytes for right channel.

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