gramps
dc91c855ef
- Elements scrollbar no longer deselects element on click (check ScrollViewer, not StackPanel) - Web source: URI + check/revert buttons merged into single DockPanel row, consistent order (✓ rightmost) - Countdown timer moved from Elements panel to inline in source list row, range clamped to 1-30 min - Volume slider click-to-position restored: e.Handled prevents IncreaseLarge from overriding position, Thumb drag still works - Desktop audio meter: asymmetric smoothing (attack 0.2, decay 0.08) for faster response to silence - 207 tests passing, 0 warnings
63 lines
2.2 KiB
C#
63 lines
2.2 KiB
C#
namespace ytLive.Services.Audio;
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/// <summary>
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/// Computes the smoothed level (0..1) from captured samples. Pure —
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/// unit-tested; the <see cref="AudioMixer"/> only feeds it and forwards the
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/// result. RMS-based so it tracks perceived loudness, smoothed so the meter
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/// does not flicker. Supports asymmetric smoothing: fast attack (rise) and
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/// configurable decay (fall) so the meter responds quickly to silence.
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/// </summary>
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public sealed class AudioLevelMeter
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{
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private float _level;
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public float Level => _level;
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public AudioLevelMeter(float attackSmoothing = 0.2f, float decaySmoothing = 0.08f)
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{
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AttackSmoothing = attackSmoothing;
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DecaySmoothing = decaySmoothing;
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}
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public float AttackSmoothing { get; }
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public float DecaySmoothing { get; }
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/// <summary>
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/// Maps a linear level (0..1) onto the meter's display scale: -60 dBFS..0 dBFS
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/// spread linearly across 0..1, with +10 dB of input amplification. Linear RMS
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/// of real speech or game audio is ~0.01..0.1 (-40..-20 dBFS), which leaves a
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/// flat (linear) meter looking dead; the log scale makes typical levels occupy
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/// the bar and the amplification pushes real speech peaks into the red zone
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/// (0.8+) at maxed volume instead of hovering at its edge. Inputs at or below
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/// -60 dBFS (0.001 linear) read as zero — the meter never idles on background noise.
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/// </summary>
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public static float ToDisplay(float linear)
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{
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if (linear <= 0.001f)
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return 0f;
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var db = 20f * MathF.Log10(linear) + 10f;
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return Math.Clamp(1f + db / 60f, 0f, 1f);
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}
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public float Push(AudioSample sample)
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{
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if (sample.Samples.Length == 0)
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return _level;
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double sumSquares = 0;
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var count = 0;
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foreach (var value in sample.Samples)
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{
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sumSquares += value * value;
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count++;
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}
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var rms = (float)Math.Sqrt(sumSquares / count);
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var smoothing = rms > _level ? AttackSmoothing : DecaySmoothing;
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_level = _level * (1 - smoothing) + rms * smoothing;
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return _level;
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}
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public void Reset() => _level = 0;
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}
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