ebur128/bench_test.go at main · exaring/ebur128 · GitHub

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package ebur128

import (
	"math"
	"testing"
)

func makeStereoSine(n int) []float64 {
	buf := make([]float64, n*2)
	for i := range n {
		s := math.Sin(2 * math.Pi * 1000 * float64(i) / sampleRate48k)
		buf[i*2] = s
		buf[i*2+1] = s
	}
	return buf
}

func BenchmarkWrite(b *testing.B) {
	buf := makeStereoSine(sampleRate48k) // 1 second
	meter, _ := New(LayoutStereo, sampleRate48k)

	b.SetBytes(int64(len(buf)) * 8)
	b.ResetTimer()
	for range b.N {
		meter.Reset()
		meter.Write(buf)
	}
}

func BenchmarkWriteFloat32(b *testing.B) {
	f32 := make([]float32, sampleRate48k*2)
	for i := range sampleRate48k {
		s := float32(math.Sin(2 * math.Pi * 1000 * float64(i) / sampleRate48k))
		f32[i*2] = s
		f32[i*2+1] = s
	}
	meter, _ := New(LayoutStereo, sampleRate48k)

	b.SetBytes(int64(len(f32)) * 4)
	b.ResetTimer()
	for range b.N {
		meter.Reset()
		meter.WriteFloat32(f32)
	}
}

func BenchmarkLoudness(b *testing.B) {
	buf := makeStereoSine(sampleRate48k * 60) // 60 seconds
	meter, _ := New(LayoutStereo, sampleRate48k)
	meter.Write(buf)

	b.ResetTimer()
	for range b.N {
		meter.Loudness()
	}
}

func BenchmarkEndToEnd(b *testing.B) {
	buf := makeStereoSine(sampleRate48k * 10) // 10 seconds

	b.SetBytes(int64(len(buf)) * 8)
	b.ResetTimer()
	for range b.N {
		meter, _ := New(LayoutStereo, sampleRate48k)
		meter.Write(buf)
		meter.Loudness()
	}
}