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Avoid masking the index with each iteration, and instead do up to when the mask
would apply. This allows for better optimizations, in particular fewer
instructions and better chances for vectorization.
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Rather than continuously wrapping when used, each update uses it from the front
and copies the tail to the front at the end. This allows for more effficient
accesses in loops.
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This provides better characteristics for an amplitude limiter. In particular,
it utilizes the peak amplitude instead of the RMS, and the used parameters
basically guarantee no output samples exceed the given threshold... almost, due
to floating-point errors as the threshold is converted from dB to log-e for the
envelope, then is negated and converted to linear amplitude to apply to the
signal. It's quite possible for some rounding errors to creep in and not
perfectly saturate the result.
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This is just for the output limiter right now, but in the future can be used
for the compressor EFX effect. The parameters are also hardcoded, but can be
made configurable after 1.18.
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