dndmusicbot/opus/decode.go

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2022-11-27 23:42:51 +00:00
package opus
import (
"io"
"log"
"sync"
"github.com/faiface/beep"
"github.com/pkg/errors"
opusd "gopkg.in/hraban/opus.v2"
)
type decoder struct {
sync.Mutex
rc io.ReadSeekCloser
r *opusd.Stream
err error
}
func New(f io.ReadSeekCloser) (beep.StreamSeeker, error) {
d := new(decoder)
st, err := opusd.NewStream(f)
if err != nil {
return d, err
}
d.rc = f
d.r = st
return d, nil
}
func (s *decoder) Err() error { return s.err }
func (d *decoder) Stream(samples [][2]float64) (n int, ok bool) {
if d.err != nil {
return 0, false
}
var tmp [2]float32
for i := range samples {
dn, err := d.r.ReadFloat32(tmp[:])
if dn == 1 {
samples[i][0], samples[i][1] = float64(tmp[0]), float64(tmp[1])
n++
ok = true
}
if err == io.EOF {
ok = false
break
}
if err != nil {
ok = false
d.err = errors.Wrap(err, "ogg/opus")
break
}
}
return n, ok
}
func (d *decoder) Len() int {
return 0
}
func (d *decoder) Position() int {
return 0
}
func (d *decoder) Seek(p int) error {
_, err := d.rc.Seek(int64(p), io.SeekStart)
if err != nil {
log.Println(err)
return errors.Wrap(err, "ogg/opus")
}
st, err := opusd.NewStream(d.rc)
if err != nil {
log.Println(err)
return errors.Wrap(err, "ogg/opus")
}
d.r = st
return nil
}