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audio: wav: more precise Position and Seek

This commit is contained in:
faiface 2017-07-14 02:22:33 +02:00
parent 7624d11cfc
commit 9a6fbad6ce
1 changed files with 2 additions and 3 deletions
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5
audio/wav/decode.go
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@ -94,15 +94,14 @@ func (s *decoder) Duration() time.Duration {
func (s *decoder) Position() time.Duration {
frameIndex := time.Duration(s.pos / int32(s.h.BytesPerFrame))
frameTime := time.Second / time.Duration(s.h.SampleRate)
return frameIndex * frameTime
return frameIndex * time.Second / time.Duration(s.h.SampleRate)
}
func (s *decoder) Seek(d time.Duration) error {
if d < 0 || s.Duration() < d {
return fmt.Errorf("wav: seek duration %v out of range [%v, %v]", d, 0, s.Duration())
}
frame := int32(d / (time.Second / time.Duration(s.h.SampleRate)))
frame := int32(d * time.Duration(s.h.SampleRate) / time.Second)
pos := frame * int32(s.h.BytesPerFrame)
_, err := s.rsc.Seek(int64(pos)+44, io.SeekStart) // 44 is the size of the header
if err != nil {