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update spectrogram tilt and gain

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Boof2015
2026-04-23 01:06:52 -04:00
parent d75915f4cc
commit 9990fbed57
2 changed files with 61 additions and 15 deletions
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test/renderer-helpers.test.ts
+50 -5
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@@ -1517,7 +1517,7 @@ test('Spectrogram keeps the historical display dB range for line thickness', ()
}
})
test('Spectrogram heat compensation does not change display intensity range', () => {
test('Spectrogram display gain feeds both display and heat intensity', () => {
const dom = installFakeCanvasDom()
const dataSource = {
getPendingSpectrogramSamples: () => [],
@@ -1551,11 +1551,56 @@ test('Spectrogram heat compensation does not change display intensity range', ()
magnitudes.fill(-120)
magnitudes[1] = -66
const values = state.drawColumn(magnitudes)
const expectedDisplay = Math.pow((-66 - (-90)) / (-12 - (-90)), 1.4)
const expectedHeat = normalizeHeatDb(-60)
const expectedDisplay = Math.pow((-64 - (-90)) / (-12 - (-90)), 1.4)
const expectedHeat = normalizeHeatDb(-58)
assertAlmostEqual(values[0], expectedDisplay, 1e-6, 'display intensity should keep the historical spectrogram range')
assertAlmostEqual(state.heatColumnValues[0], expectedHeat, 1e-6, 'heat color should use compensated dB against the shared heat range')
assertAlmostEqual(values[0], expectedDisplay, 1e-6, 'display intensity should include spectrogram display gain')
assertAlmostEqual(state.heatColumnValues[0], expectedHeat, 1e-6, 'heat color should include display gain before heat compensation')
} finally {
spectrogram.dispose()
dom.restore()
}
})
test('Spectrogram tilt adds 4 dB per octave above the reference frequency', () => {
const dom = installFakeCanvasDom()
const dataSource = {
getPendingSpectrogramSamples: () => [],
getSampleRate: () => 48000,
isPlaying: () => false,
subscribeToSessionChanges: () => () => {},
}
const canvas = createFakeCanvas()
canvas.width = 1
canvas.height = 1
const spectrogram = new Spectrogram(canvas, {
dataSource,
clarityMode: 'classic',
minDecibels: -90,
maxDecibels: -12,
})
try {
const state = spectrogram as unknown as {
drawColumn: (magnitudes: Float32Array) => Float32Array
heatColumnValues: Float32Array
rowCenterBins: Float32Array
rowBandStartBins: Float32Array
rowBandEndBins: Float32Array
}
state.rowCenterBins = Float32Array.from([2])
state.rowBandStartBins = Float32Array.from([1.5])
state.rowBandEndBins = Float32Array.from([2.5])
const magnitudes = new Float32Array(24)
magnitudes.fill(-120)
magnitudes[2] = -66
const values = state.drawColumn(magnitudes)
const expectedDisplay = Math.pow((-60 - (-90)) / (-12 - (-90)), 1.4)
const expectedHeat = normalizeHeatDb(-54)
assertAlmostEqual(values[0], expectedDisplay, 1e-6, 'display intensity should include +4 dB/oct spectrogram tilt')
assertAlmostEqual(state.heatColumnValues[0], expectedHeat, 1e-6, 'heat color should include +4 dB/oct spectrogram tilt')
} finally {
spectrogram.dispose()
dom.restore()