56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
package player
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// UserVolume represents volume on a user-facing scale (0-100).
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type UserVolume int
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// PlayerVolume represents volume on an internal scale (-10 to 10).
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type PlayerVolume float64
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// User volume range bounds.
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const (
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MinUserVol UserVolume = 0
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MaxUserVol UserVolume = 100
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)
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// Player volume range bounds.
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const (
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MinPlayerVol PlayerVolume = -4
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MaxPlayerVol PlayerVolume = 0
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)
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// ToPlayerVolume converts user volume to internal player volume.
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func (oldVol UserVolume) ToPlayerVolume() PlayerVolume {
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var newVol PlayerVolume
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if oldVol >= MinUserVol && oldVol <= MaxUserVol {
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ratio := PlayerVolume(oldVol-MinUserVol) / PlayerVolume(MaxUserVol-MinUserVol)
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newVol = ratio*(MaxPlayerVol-MinPlayerVol) + MinPlayerVol
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}
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return newVol
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}
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// ToUserVolume converts internal player volume to user volume.
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func (oldVolFloat PlayerVolume) ToUserVolume() UserVolume {
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var newVol UserVolume
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if oldVolFloat >= MinPlayerVol && oldVolFloat <= MaxPlayerVol {
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ratio := (oldVolFloat - MinPlayerVol) / (MaxPlayerVol - MinPlayerVol)
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newVol = UserVolume(ratio*PlayerVolume(MaxUserVol-MinUserVol)) + MinUserVol
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}
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return newVol
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}
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func clampVolume(v UserVolume) UserVolume {
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if v > MaxUserVol {
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return MaxUserVol
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}
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if v < MinUserVol {
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return MinUserVol
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}
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return v
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}
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