59 lines
2.5 KiB
C#
59 lines
2.5 KiB
C#
using Robust.Shared.Audio;
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using Robust.Shared.Prototypes;
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using Robust.Shared.Random;
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namespace Content.Shared.Audio
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{
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public static class AudioHelpers{
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/// <summary>
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/// Returns a random pitch.
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/// </summary>
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public static AudioParams WithVariation(float amplitude)
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{
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var scale = (float)(IoCManager.Resolve<IRobustRandom>().NextGaussian(1, amplitude));
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return AudioParams.Default.WithPitchScale(scale);
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}
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// Might as well just hardcode these because the audio system is limited to pitching up and down
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// by 12 semitones anyway (ie. 0.5 to 2.0 multiplier).
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private static readonly float[] SemitoneMultipliers =
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{
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0.5f, 233.08f/440f, 246.94f/440f, 261.63f/440f,
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277.18f/440f, 293.66f/440f, 311.13f/440f, 329.63f/440f,
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349.23f/440f, 369.99f/440f, 392.00f/440f, 415.30f/440f,
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1.0f,
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466.16f/440f, 493.88f/440f, 523.25f/440f, 554.37f/440f,
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587.33f/440f, 622.25f/440f, 659.26f/440f, 698.46f/440f,
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739.99f/440f, 783.99f/440f, 830.61f/440f, 2.0f
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};
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/// <summary>
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/// Returns a pitch multiplier that shifts by the given number of semitones.
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/// </summary>
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/// <param name="shift">Number of semitones to shift, positive or negative. Clamped between -12 and 12
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/// which correspond to a pitch multiplier of 0.5 and 2.0 respectively.</param>
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public static AudioParams ShiftSemitone(int shift)
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{
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shift = MathHelper.Clamp(shift, -12, 12);
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float pitchMult = SemitoneMultipliers[shift + 12];
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return AudioParams.Default.WithPitchScale(pitchMult);
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}
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/// <summary>
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/// Returns a pitch multiplier shifted by a random number of semitones within variation.
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/// </summary>
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/// <param name="variation">Max number of semitones to shift in either direction. Values above 12 have no effect.</param>
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public static AudioParams WithSemitoneVariation(int variation)
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{
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variation = Math.Clamp(variation, 0, 12);
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return ShiftSemitone(IoCManager.Resolve<IRobustRandom>().Next(-variation, variation));
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}
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public static string GetRandomFileFromSoundCollection(string name)
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{
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var soundCollection = IoCManager.Resolve<IPrototypeManager>().Index<SoundCollectionPrototype>(name);
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return IoCManager.Resolve<IRobustRandom>().Pick(soundCollection.PickFiles).ToString();
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}
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}
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}
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