Bencina: Real-time audio programming 101: time waits for nothing

Ross Bencina has put up an introduction to glitch-free audio programming. "The main problems I'm concerned with here are with code that runs with unpredictable or un-bounded execution time. That is, you're unable to predict in advance how long a function or algorithm will take to complete. Perhaps this is because the algorithm you chose isn't appropriate, or perhaps it's because you don't understand the temporal behavior of the code you're calling. Whatever the cause, the result is the same: sooner or later your code will take longer than the buffer period and your audio will glitch."

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