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Adds a semitone shifting AudioHelper (#2608)

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* Add semitone audio helper

* use semitone audio helper on bike horn

* prettify

* clamp this instead

* Expose these to viewvars
This commit is contained in:
Peter Wedder
2020-11-25 12:23:03 +02:00
committed by GitHub
parent d62fd46cb8
commit 243215ec5d
3 changed files with 48 additions and 3 deletions
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37
Content.Shared/Audio/AudioHelpers.cs
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@@ -1,6 +1,8 @@
using System;
using Robust.Shared.Audio;
using Robust.Shared.Interfaces.Random;
using Robust.Shared.IoC;
using Robust.Shared.Maths;
using Robust.Shared.Prototypes;
using Robust.Shared.Random;
@@ -16,6 +18,41 @@ namespace Content.Shared.Audio
return AudioParams.Default.WithPitchScale(scale);
}
// Might as well just hardcode these because the audio system is limited to pitching up and down
// by 12 semitones anyway (ie. 0.5 to 2.0 multiplier).
private static readonly float[] SemitoneMultipliers =
{
0.5f, 233.08f/440f, 246.94f/440f, 261.63f/440f,
277.18f/440f, 293.66f/440f, 311.13f/440f, 329.63f/440f,
349.23f/440f, 369.99f/440f, 392.00f/440f, 415.30f/440f,
1.0f,
466.16f/440f, 493.88f/440f, 523.25f/440f, 554.37f/440f,
587.33f/440f, 622.25f/440f, 659.26f/440f, 698.46f/440f,
739.99f/440f, 783.99f/440f, 830.61f/440f, 2.0f
};
/// <summary>
/// Returns a pitch multiplier that shifts by the given number of semitones.
/// </summary>
/// <param name="shift">Number of semitones to shift, positive or negative. Clamped between -12 and 12
/// which correspond to a pitch multiplier of 0.5 and 2.0 respectively.</param>
public static AudioParams ShiftSemitone(int shift)
{
shift = MathHelper.Clamp(shift, -12, 12);
float pitchMult = SemitoneMultipliers[shift + 12];
return AudioParams.Default.WithPitchScale(pitchMult);
}
/// <summary>
/// Returns a pitch multiplier shifted by a random number of semitones within variation.
/// </summary>
/// <param name="variation">Max number of semitones to shift in either direction. Values above 12 have no effect.</param>
public static AudioParams WithSemitoneVariation(int variation)
{
variation = Math.Clamp(variation, 0, 12);
return ShiftSemitone(IoCManager.Resolve<IRobustRandom>().Next(-variation, variation));
}
public static string GetRandomFileFromSoundCollection(string name)
{
var soundCollection = IoCManager.Resolve<IPrototypeManager>().Index<SoundCollectionPrototype>(name);