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Visualization: Improve latency and buffering appearance

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Adjust the buffering so if latency is too low, we fill the rest of
the output with silence instead of peeking at the oldest part
of the buffer. Also increase latency by half a buffer size so
that the requested sample is in the center of the buffer, which
improves the 4096 sample situation with the current low
latency output.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>
This commit is contained in:
Christopher Snowhill 2023-10-03 19:34:42 -07:00
parent 2102fc1c44
commit b07a6fd098
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1 changed files with 13 additions and 2 deletions
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15
Audio/Visualization/VisualizationController.swift
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@ -98,15 +98,26 @@ class VisualizationController : NSObject {
var outPCMCopy = Array<Float>(repeating: 0.0, count: 4096)
serialQueue.sync {
let latencySamples = (Int)(self.latency * self.sampleRate)
// Offset latency so the target sample is in the center of the window
let latencySamples = (Int)((self.latency + latencyOffset) * self.sampleRate) + 2048
var samplesToDo = 4096;
if(latencySamples < 4096) {
// Latency can sometimes dip below this threshold
samplesToDo = latencySamples;
}
var j = self.visAudioCursor - latencySamples
let k = self.visAudioSize
if j < 0 { j += k }
for i in 0...4095 {
for i in 0..<samplesToDo {
let x = self.visAudio[j]
outPCMCopy[i] = x
j += 1; if j >= k { j = 0 }
}
if(samplesToDo < 4096) {
for i in samplesToDo...4095 {
outPCMCopy[i] = 0
}
}
}
if(outPCM != nil) {