使用软件合成器制作实时音频应用程序(Making a real-time audio application with software synthesizers)

 我正在研究制作一些使键盘功能像钢琴一样的软件（例如，用户按下'W'键并且扬声器播放D音符）。 我可能会使用OpenAL。 我理解数字音频的基础知识，但是在按键时播放实时音频会带来一些我无法解决问题的问题。 
 
 问题在于：假设我有10个音频缓冲区，每个缓冲区都有一秒钟的音频数据。 如果我必须在通过扬声器播放之前填充缓冲区，那么我会在播放前一两秒填充缓冲区。 这意味着每当用户尝试播放音符时，按下琴键和正在播放的音符之间将有一到两秒的延迟。 
 
 你如何解决这个问题？ 你是否只是让缓冲区尽可能小，并尽可能地填充它们？ 有一些我不知道的技巧吗？ 

I'm looking into making some software that makes the keyboard function like a piano (e.g., the user presses the 'W' key and the speakers play a D note). I'll probably be using OpenAL. I understand the basics of digital audio, but playing real-time audio in response to key presses poses some problems I'm having trouble solving.
 
Here is the problem: Let's say I have 10 audio buffers, and each buffer holds one second of audio data. If I have to fill buffers before they are played through the speakers, then I would would be filling buffers one or two seconds before they are played. That means that whenever the user tries to play a note, there will be a one or two second delay between pressing the key and the note being played.
 
How do you get around this problem? Do you just make the buffers as small as possible, and fill them as late as possible? Is there some trick that I am missing?

原文：https://stackoverflow.com/questions/1392725