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Visualization: Optimize Swift code handling arrays

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This looks a lot better than some ruddy for-loops.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
This commit is contained in:
Christopher Snowhill 2025-02-13 19:58:20 -08:00
parent b0e6ec98a9
commit 2ba8ec04a2
1 changed files with 18 additions and 8 deletions
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26
Audio/Visualization/VisualizationController.swift
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@ -67,10 +67,17 @@ class VisualizationController : NSObject {
let bufferPointer = UnsafeBufferPointer<Float>(start: inPCM, count: amount)
var j = self.visAudioCursor
let k = self.visAudioSize
for i in 0..<amount {
let x = bufferPointer[i]
self.visAudio[j] = x
j += 1; if j >= k { j = 0 }
if(j + amount <= k) {
let endIndex = j + amount;
self.visAudio.replaceSubrange(j..<endIndex, with: bufferPointer)
j += amount
if(j >= k) { j = 0 }
} else {
let inEndIndex = k - j
let remainder = amount - inEndIndex
self.visAudio.replaceSubrange(j..<k, with: bufferPointer.prefix(inEndIndex))
self.visAudio.replaceSubrange(0..<remainder, with: bufferPointer.suffix(remainder))
j = remainder
}
self.visAudioCursor = j
self.visSamplesPosted += UInt64(amount);
@ -108,10 +115,13 @@ class VisualizationController : NSObject {
var j = self.visAudioCursor - latencySamples
let k = self.visAudioSize
if j < 0 { j += k }
for i in 0..<samplesToDo {
let x = self.visAudio[j]
outPCMCopy[i] = x
j += 1; if j >= k { j = 0 }
if(j + samplesToDo <= k) {
outPCMCopy.replaceSubrange(0..<samplesToDo, with: self.visAudio.suffix(from: j).prefix(samplesToDo))
} else {
let outEndIndex = k - j
let remainder = samplesToDo - outEndIndex
outPCMCopy.replaceSubrange(0..<outEndIndex, with: self.visAudio.suffix(from: j))
outPCMCopy.replaceSubrange(outEndIndex..<samplesToDo, with: self.visAudio.prefix(remainder))
}
}