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audio/internal/convert: refactoring

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This commit is contained in:
Hajime Hoshi 2022-10-23 01:14:30 +09:00
parent 3b7bc2fc57
commit 1906262ef4
1 changed files with 4 additions and 2 deletions
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6
audio/internal/convert/resampling.go
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@ -28,7 +28,7 @@ var (
cosTableOnce sync.Once
)
func getCosTable() []float64 {
func ensureCosTable() []float64 {
cosTableOnce.Do(func() {
cosTable = make([]float64, 65536)
for i := range cosTable {
@ -42,7 +42,9 @@ func fastCos01(x float64) float64 {
if x < 0 {
x = -x
}
i := int(4 * float64(len(getCosTable())) * x)
cosTable := ensureCosTable()
i := int(4 * float64(len(cosTable)) * x)
if 4*len(cosTable) < i {
i %= 4 * len(cosTable)
}