gurix
bb13527281
- TestAllClassesHaveConfig, TestFrequenciesInRange, TestFrequenciesUnique - TestHarmonicsNonEmpty, TestPanPositionsInRange - TestOscillatorAdvance, TestOscillatorPhaseWrap, TestOscillatorDistinctFreqs - TestEMAAmplitudeRise, TestEMAAmplitudeDecay, TestWhisperFloor, TestWhisperFloorNotSeenIsZero
89 lines
2.6 KiB
Go
89 lines
2.6 KiB
Go
package synth_test
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import (
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"testing"
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"github.com/netsynth/netsynth/synth"
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)
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func TestEMAAmplitudeRise(t *testing.T) {
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cfg2 := synth.FreqConfig{
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BaseHz: 440.0,
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Harmonics: []synth.HarmonicDef{{Ratio: 1, Amplitude: 1.0}},
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Pan: 0.0,
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}
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layer := synth.NewLayer(cfg2, synth.SampleRate, 1.0)
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// Force the layer to have been seen and set target to 1.0
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layer.UpdateTarget(100, 100)
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// After 1 second (SampleRate samples) with tau=1.0, currentAmp should be > 0.5
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// EMA: after tau seconds, amplitude reaches ~63% of target
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for i := 0; i < synth.SampleRate; i++ {
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layer.AdvanceSample()
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}
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if layer.CurrentAmp() <= 0.5 {
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t.Errorf("expected currentAmp > 0.5 after 1 second rise, got %.4f", layer.CurrentAmp())
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}
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}
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func TestEMAAmplitudeDecay(t *testing.T) {
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cfg := synth.FreqConfig{
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BaseHz: 440.0,
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Harmonics: []synth.HarmonicDef{{Ratio: 1, Amplitude: 1.0}},
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Pan: 0.0,
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}
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layer := synth.NewLayer(cfg, synth.SampleRate, 1.0)
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// Set up: layer has been seen (currentAmp starts at 1.0) and target is whisper floor
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// We'll manually prime by updating target with 100/100 first then re-route to whisper
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layer.UpdateTarget(100, 100) // mark as seen, target=1.0
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// Force currentAmp to 1.0 by running a few cycles at target 1.0
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for i := 0; i < synth.SampleRate*3; i++ {
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layer.AdvanceSample()
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}
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// Now decay: set count=0 (whisper floor kicks in)
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layer.UpdateTarget(0, 100)
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// After 1 second, currentAmp should be < 0.5
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for i := 0; i < synth.SampleRate; i++ {
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layer.AdvanceSample()
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}
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if layer.CurrentAmp() >= 0.5 {
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t.Errorf("expected currentAmp < 0.5 after 1 second decay, got %.4f", layer.CurrentAmp())
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}
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}
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func TestWhisperFloor(t *testing.T) {
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cfg := synth.FreqConfig{
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BaseHz: 440.0,
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Harmonics: []synth.HarmonicDef{{Ratio: 1, Amplitude: 1.0}},
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Pan: 0.0,
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}
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layer := synth.NewLayer(cfg, synth.SampleRate, 1.0)
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// Mark layer as seen by passing count=1, then set count=0
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layer.UpdateTarget(1, 100)
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layer.UpdateTarget(0, 100)
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// Target should be whisper floor (not zero) because seen=true
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if layer.TargetAmp() < synth.WhisperFloor {
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t.Errorf("expected targetAmp >= WhisperFloor (%.2f) for seen layer at zero count, got %.4f",
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synth.WhisperFloor, layer.TargetAmp())
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}
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}
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func TestWhisperFloorNotSeenIsZero(t *testing.T) {
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cfg := synth.FreqConfig{
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BaseHz: 440.0,
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Harmonics: []synth.HarmonicDef{{Ratio: 1, Amplitude: 1.0}},
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Pan: 0.0,
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}
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layer := synth.NewLayer(cfg, synth.SampleRate, 1.0)
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// Never seen — UpdateTarget with zero count
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layer.UpdateTarget(0, 100)
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if layer.TargetAmp() != 0.0 {
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t.Errorf("expected targetAmp == 0.0 for unseen layer, got %.4f", layer.TargetAmp())
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}
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}
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