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docs(tracker): update comments

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5684185+vsariola@users.noreply.github.com 2023-10-17 20:31:57 +03:00
parent b97d269cc4
commit bb0d4d6800
1 changed files with 3 additions and 7 deletions
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10
tracker/volume.go
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@ -12,11 +12,7 @@ type Volume struct {
Peak [2]float64 Peak [2]float64
} }
// VuAnalyzer receives stereo from the bc channel and converts these into peak & // Analyze updates Average and Peak fields, by analyzing the given buffer.
// average volume measurements, and pushes Volume values into the vc channel.
// The pushes are nonblocking so if e.g. a GUI does not have enough time to
// process redraw the volume meter, the values is just skipped. Thus, the vc
// chan should have a capacity of at least 1 (!).
// //
// Internally, it first converts the signal to decibels (0 dB = +-1). Then, the // Internally, it first converts the signal to decibels (0 dB = +-1). Then, the
// average volume level is computed by smoothing the decibel values with a // average volume level is computed by smoothing the decibel values with a
@ -27,8 +23,8 @@ type Volume struct {
// constants for attack and release are different. Generally attack << release. // constants for attack and release are different. Generally attack << release.
// Typical values could be attack 1.5e-3 and release 1.5 (seconds) // Typical values could be attack 1.5e-3 and release 1.5 (seconds)
// //
// minVolume is just a hard limit for the vuanalyzer volumes, in decibels, just to // minVolume and maxVolume are hard limits in decibels to prevent negative
// prevent negative infinities for volumes // infinities for volumes
func (v *Volume) Analyze(buffer []float32, tau float64, attack float64, release float64, minVolume float64, maxVolume float64) error { func (v *Volume) Analyze(buffer []float32, tau float64, attack float64, release float64, minVolume float64, maxVolume float64) error {
alpha := 1 - math.Exp(-1.0/(tau*44100)) // from https://en.wikipedia.org/wiki/Exponential_smoothing alpha := 1 - math.Exp(-1.0/(tau*44100)) // from https://en.wikipedia.org/wiki/Exponential_smoothing
alphaAttack := 1 - math.Exp(-1.0/(attack*44100)) alphaAttack := 1 - math.Exp(-1.0/(attack*44100))