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global getLevels

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Ralty
2025-08-01 18:36:16 +07:00
parent 19e5c2c85e
commit 9bf7bcefe4
1 changed files with 50 additions and 36 deletions
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source/funkin/backend/utils/AudioAnalyzer.hx
+50 -36
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@@ -38,6 +38,54 @@ class AudioAnalyzer {
else return inline ArrayBufferIO.getUint8(buffer, position) - 128;
}
/**
* Gets levels from the frequencies with specified sample rate.
* @param frequencies Frequencies input.
* @param sampleRate Sample Rate input.
* @param barCount How much bars to get.
* @param levels The output for getting the values, to avoid memory leaks (Optional).
* @param delta How much delta for smoothen the values from the previous levels values (Optional).
* @param minDb The minimum decibels to cap (Optional, default -70.0).
* @param maxDb The maximum decibels to cap (Optional, default -10.0).
* @param minFreq The minimum frequency to cap (Optional, default 20.0).
* @param maxFreq The maximum frequency to cap (Optional, default 22000.0).
* @return Output of levels/bars
*/
public static function getLevelsFromFrequencies(frequencies:Array<Float>, sampleRate:Int, barCount:Int, ?levels:Array<Float>, delta = 0.0, minDb = -70.0, maxDb = -10.0, minFreq = 20.0, maxFreq = 22000.0):Array<Float> {
if (levels == null) levels = [];
levels.resize(barCount);
var logMin = Math.log(minFreq), logMax = Math.log(maxFreq);
var logRange = logMax - logMin, dbRange = maxDb - minDb, n = frequencies.length;
inline function calculateScale(i:Int)
return CoolUtil.bound(Math.exp(logMin + (logRange * i / (barCount + 1))) * n * 2 / sampleRate, 0, n - 1);
var s1 = calculateScale(0), s2;
var i1 = Math.floor(s1), i2;
var v, range;
for (i in 0...barCount) {
if ((range = (s2 = calculateScale(i + 1)) - s1) < 1) {
i2 = Math.ceil(s2);
if (i2 == i1) v = frequencies[i1] * range;
else v = (frequencies[i1] + (frequencies[i2] - frequencies[i1]) * (s1 - i1)) * range;
}
else {
v = frequencies[i1] * (Math.ceil(s1) - i1);
if (i1 != (i2 = Math.floor(s2))) {
while (++i1 < i2) v += frequencies[i1];
v += frequencies[i2] * (s2 - Math.floor(s2));
}
}
i1 = Math.floor(s1 = s2);
v = ((20 * Math.log(v) / 2.302585092994046) - minDb) / dbRange;
if (delta > 0 && delta < 1 && v < levels[i]) levels[i] -= Math.pow(levels[i] - v, 2.302585092994046) * delta;
else levels[i] = v;
}
return levels;
}
/**
* The current sound to analyze.
*/
@@ -184,42 +232,8 @@ class AudioAnalyzer {
* @param maxFreq The maximum frequency to cap (Optional, default 22000.0).
* @return Output of levels/bars
*/
public function getLevels(startPos:Float, barCount:Int, ?levels:Array<Float>, delta = 0.0, minDb = -70.0, maxDb = -10.0, minFreq = 20.0, maxFreq = 22000.0):Array<Float> {
__frequencies = getFrequencies(startPos, __frequencies);
if (levels == null) levels = [];
levels.resize(barCount);
var logMin = Math.log(minFreq), logMax = Math.log(maxFreq);
var logRange = logMax - logMin, dbRange = maxDb - minDb;
inline function calculateScale(i:Int)
return CoolUtil.bound(Math.exp(logMin + (logRange * i / (barCount + 1))) * fftN / buffer.sampleRate, 0, __N2 - 1);
var s1 = calculateScale(0), s2;
var i1 = Math.floor(s1), i2;
var v, range;
for (i in 0...barCount) {
if ((range = (s2 = calculateScale(i + 1)) - s1) < 1) {
i2 = Math.ceil(s2);
if (i2 == i1) v = __frequencies[i1] * range;
else v = (__frequencies[i1] + (__frequencies[i2] - __frequencies[i1]) * (s1 - i1)) * range;
}
else {
v = __frequencies[i1] * (Math.ceil(s1) - i1);
if (i1 != (i2 = Math.floor(s2))) {
while (++i1 < i2) v += __frequencies[i1];
v += __frequencies[i2] * (s2 - Math.floor(s2));
}
}
i1 = Math.floor(s1 = s2);
v = ((20 * Math.log(v) / 2.302585092994046) - minDb) / dbRange;
if (delta > 0 && delta < 1 && v < levels[i]) levels[i] -= Math.pow(levels[i] - v, 2) * delta;
else levels[i] = v;
}
return levels;
}
public function getLevels(startPos:Float, barCount:Int, ?levels:Array<Float>, ?delta:Float, ?minDb:Float, ?maxDb:Float, ?minFreq:Float, ?maxFreq:Float):Array<Float>
return inline getLevelsFromFrequencies(__frequencies = getFrequencies(startPos, __frequencies), buffer.sampleRate, barCount, levels, delta, minDb, maxDb, minFreq, maxFreq);
/**
* Gets frequencies from an attached FlxSound from startPos.