gramps
2607ecf210
Reported: the TRAX bar moves, but its sampling looks far slower than the mic meter. Cause: the TRAX number was a raw instantaneous peak per metering block — a stutter sampled by the UI timer, with no smoothing. The mic looks fluid because it is smoothed at audio-callback rate. Fix: the player now smooths its measured level with the SAME curve the mic uses (MeterScale.NextLevel: fast attack, gentle decay), and the dock's meter clock runs at ~30 Hz instead of 20. Two ladders that move alike, because they are the same ballistics. Guard: MeterScaleTests pins the attack/decay behaviour alongside peak-hold.
42 lines
2.1 KiB
C#
42 lines
2.1 KiB
C#
using Xunit;
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using ytLive.Helpers;
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namespace ytLive.Tests;
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/// <summary>A segment ladder is only useful if the band it paints is the level it measured. The
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/// thresholds are DESIGN.md's (nominal / caution / peak), and peak-hold is what makes clipping
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/// visible — a bar that follows the moment hides the one audio fault that cannot be fixed later.
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/// </summary>
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public class MeterScaleTests
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{
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[Fact]
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public void Bands_peak_hold_and_the_display_scale_follow_the_standard()
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{
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// Bands at the documented thresholds.
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Assert.Equal(MeterBand.Nominal, MeterScale.BandFor(-30f));
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Assert.Equal(MeterBand.Nominal, MeterScale.BandFor(-12.1f));
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Assert.Equal(MeterBand.Caution, MeterScale.BandFor(-12f));
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Assert.Equal(MeterBand.Caution, MeterScale.BandFor(-6f));
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Assert.Equal(MeterBand.Peak, MeterScale.BandFor(-3f));
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Assert.Equal(MeterBand.Peak, MeterScale.BandFor(0f));
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// Display fraction: −60 dBFS is empty, 0 dBFS is full, −30 is halfway, and nothing escapes.
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Assert.Equal(0f, MeterScale.ToFraction(-60f));
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Assert.Equal(1f, MeterScale.ToFraction(0f));
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Assert.Equal(0.5f, MeterScale.ToFraction(-30f), 4);
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Assert.Equal(1f, MeterScale.ToFraction(+12f));
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Assert.Equal(0f, MeterScale.ToFraction(-120f));
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// Level ballistics: a jump is followed quickly, a drop falls gently — the same curve that
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// makes the mic meter look fluid. Raw peaks at a 30 Hz UI tick stutter without it.
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Assert.Equal(0.6f, MeterScale.NextLevel(0f, 1f), 3); // attack
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Assert.True(MeterScale.NextLevel(0.9f, 0.1f) > 0.8f); // decay is gentle
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Assert.True(MeterScale.NextLevel(0.1f, 0.9f) > 0.5f); // rise is fast
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// Peak hold rises instantly, then decays at the stated rate.
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Assert.Equal(0.8f, MeterScale.NextPeak(0.2f, 0.8f, 0.05f));
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Assert.Equal(0.7f, MeterScale.NextPeak(0.8f, 0.1f, 0.1f / 0.35f), 3); // 0.1 fall at 0.35/s
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Assert.Equal(0f, MeterScale.NextPeak(0.1f, 0f, 10f)); // never negative
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}
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}
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