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fix(media-jvm): balanced volume scaling curve for desktop (pow 1.45)

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Murilo Scolari 2026-10-24 01:28:10 -03:00
parent e730b23364
commit 561bd98bad
1 changed files with 6 additions and 4 deletions
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10
media/media-jvm/src/main/java/com/simpmusic/media_jvm/mpv/MpvPlayer.kt
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@ -709,9 +709,11 @@ class MpvPlayer private constructor(
}
/**
* Volume is applied via mpv's software volume with a cubic perceptual curve.
* Human hearing perceives loudness logarithmically. A linear scale makes 1% sound extremely loud (-40 dB).
* Cubing the fraction gives smooth, natural attenuation where 1-10% is whisper quiet.
* Volume is applied via mpv's software volume with a balanced perceptual curve (exponent 1.45).
* Human hearing perceives loudness logarithmically. A pure cubic scale (pow 3.0) drops too steeply,
* making everything below 55% inaudible and squeezing the usable range into 55-100%.
* An exponent of 1.45 gives a natural, granular curve where 10-30% is comfortable background listening,
* 50% is moderate volume (~37%), and 1-5% is whisper quiet, without silencing the audio prematurely.
* Software volume in mpv natively accepts 0.0..100.0.
* We scale by fadePercent and sleepPercent for seamless crossfading and sleep timer.
* Crucially, we do NOT touch ao-volume so the OS mixer (e.g. Windows Volume Mixer) operates
@ -719,7 +721,7 @@ class MpvPlayer private constructor(
*/
private fun applyVolume() =
synchronized(volumeLock) {
val masterPerceptual = masterFraction.pow(3.0) * (sleepPercent / 100.0)
val masterPerceptual = if (masterFraction <= 0.0) 0.0 else masterFraction.pow(1.45) * (sleepPercent / 100.0)
val finalVolume = masterPerceptual * (fadePercent / 100.0) * 100.0
setPropertyDouble("volume", finalVolume.coerceIn(0.0, 100.0))
}