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audio: use float32 instead of float64 for blending

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Updates #2160
This commit is contained in:
Hajime Hoshi 2024-07-21 16:32:11 +09:00
parent ef8afc6cf2
commit a6a6709163
1 changed files with 3 additions and 3 deletions
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6
audio/loop.go
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@ -94,7 +94,7 @@ func (i *InfiniteLoop) ensurePos() error {
return nil return nil
} }
func (i *InfiniteLoop) blendRate(pos int64) float64 { func (i *InfiniteLoop) blendRate(pos int64) float32 {
if pos < i.lstart { if pos < i.lstart {
return 0 return 0
} }
@ -103,7 +103,7 @@ func (i *InfiniteLoop) blendRate(pos int64) float64 {
} }
p := (pos - i.lstart) / int64(i.bytesPerSample) p := (pos - i.lstart) / int64(i.bytesPerSample)
l := len(i.afterLoop) / i.bytesPerSample l := len(i.afterLoop) / i.bytesPerSample
return 1 - float64(p)/float64(l) return 1 - float32(p)/float32(l)
} }
// Read is implementation of ReadSeeker's Read. // Read is implementation of ReadSeeker's Read.
@ -152,7 +152,7 @@ func (i *InfiniteLoop) Read(b []byte) (int, error) {
case 2: case 2:
afterLoop := int16(i.afterLoop[relpos]) | (int16(i.afterLoop[relpos+1]) << 8) afterLoop := int16(i.afterLoop[relpos]) | (int16(i.afterLoop[relpos+1]) << 8)
orig := int16(b[2*idx]) | (int16(b[2*idx+1]) << 8) orig := int16(b[2*idx]) | (int16(b[2*idx+1]) << 8)
newval := int16(float64(afterLoop)*rate + float64(orig)*(1-rate)) newval := int16(float32(afterLoop)*rate + float32(orig)*(1-rate))
b[2*idx] = byte(newval) b[2*idx] = byte(newval)
b[2*idx+1] = byte(newval >> 8) b[2*idx+1] = byte(newval >> 8)
default: default: