update Oto for a player's Seek

Updates hajimehoshi/oto#172

audio/internal/cbackend/player.go

@@ -21,6 +21,7 @@
 package cbackend
 
 import (
+	"errors"
 	"io"
 	"runtime"
 	"sync"
@@ -250,6 +251,34 @@ func (p *playerImpl) Pause() {
 	p.state = playerPaused
 }
 
+func (p *Player) Seek(offset int64, whence int) (int64, error) {
+	return p.p.Seek(offset, whence)
+}
+
+func (p *playerImpl) Seek(offset int64, whence int) (int64, error) {
+	p.m.Lock()
+	defer p.m.Unlock()
+
+	if p.state == playerPlay {
+		defer p.playImpl()
+	}
+
+	// Reset the internal buffer.
+	p.resetImpl()
+
+	// Check if the source implements io.Seeker.
+	s, ok := p.src.(io.Seeker)
+	if !ok {
+		return 0, errors.New("cbackend: the source must implement io.Seeker")
+	}
+	newOffset, err := s.Seek(offset, whence)
+	if err != nil {
+		return newOffset, err
+	}
+
+	return newOffset, nil
+}
+
 func (p *Player) Reset() {
 	p.p.Reset()
 }

audio/player.go

@@ -33,6 +33,7 @@ type player interface {
 	UnplayedBufferSize() int
 	Err() error
 	SetBufferSize(bufferSize int)
+	io.Seeker
 	io.Closer
 }
 
@@ -267,13 +268,11 @@ func (p *playerImpl) Seek(offset time.Duration) error {
 		return err
 	}
 
-	if p.player.IsPlaying() {
-		defer func() {
-			p.player.Play()
-		}()
+	pos := p.stream.timeDurationToPos(offset)
+	if _, err := p.player.Seek(pos, io.SeekStart); err != nil {
+		return err
 	}
-	p.player.Reset()
-	return p.stream.Seek(offset)
+	return nil
 }
 
 func (p *playerImpl) Err() error {
@@ -338,7 +337,25 @@ func (s *timeStream) Read(buf []byte) (int, error) {
 	return n, err
 }
 
-func (s *timeStream) Seek(offset time.Duration) error {
+func (s *timeStream) Seek(offset int64, whence int) (int64, error) {
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	seeker, ok := s.r.(io.Seeker)
+	if !ok {
+		// TODO: Should this return an error?
+		panic("audio: the source must be io.Seeker when seeking but not")
+	}
+	pos, err := seeker.Seek(offset, whence)
+	if err != nil {
+		return pos, err
+	}
+
+	s.pos = pos
+	return pos, nil
+}
+
+func (s *timeStream) timeDurationToPos(offset time.Duration) int64 {
 	s.m.Lock()
 	defer s.m.Unlock()
 
@@ -348,17 +365,7 @@ func (s *timeStream) Seek(offset time.Duration) error {
 	o -= o % bytesPerSample
 	o += s.pos % bytesPerSample
 
-	seeker, ok := s.r.(io.Seeker)
-	if !ok {
-		panic("audio: the source must be io.Seeker when seeking but not")
-	}
-	pos, err := seeker.Seek(o, io.SeekStart)
-	if err != nil {
-		return err
-	}
-
-	s.pos = pos
-	return nil
+	return o
 }
 
 func (s *timeStream) Current() int64 {

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/hajimehoshi/bitmapfont/v2 v2.2.0
 	github.com/hajimehoshi/file2byteslice v0.0.0-20210813153925-5340248a8f41
 	github.com/hajimehoshi/go-mp3 v0.3.3
-	github.com/hajimehoshi/oto/v2 v2.2.0-alpha.3.0.20220627134823-65dbd988610c
+	github.com/hajimehoshi/oto/v2 v2.2.0-alpha.3.0.20220630171212-19c3101d3014
 	github.com/jakecoffman/cp v1.2.0
 	github.com/jezek/xgb v1.0.1
 	github.com/jfreymuth/oggvorbis v1.0.3

go.sum

@@ -11,8 +11,8 @@ github.com/hajimehoshi/go-mp3 v0.3.3 h1:cWnfRdpye2m9ElSoVqneYRcpt/l3ijttgjMeQh+r
 github.com/hajimehoshi/go-mp3 v0.3.3/go.mod h1:qMJj/CSDxx6CGHiZeCgbiq2DSUkbK0UbtXShQcnfyMM=
 github.com/hajimehoshi/oto v0.6.1 h1:7cJz/zRQV4aJvMSSRqzN2TImoVVMpE0BCY4nrNJaDOM=
 github.com/hajimehoshi/oto v0.6.1/go.mod h1:0QXGEkbuJRohbJaxr7ZQSxnju7hEhseiPx2hrh6raOI=
-github.com/hajimehoshi/oto/v2 v2.2.0-alpha.3.0.20220627134823-65dbd988610c h1:hHMvizeDtTgaLcvh78CvzVi82yrYkUJsr81vfRBeeg0=
-github.com/hajimehoshi/oto/v2 v2.2.0-alpha.3.0.20220627134823-65dbd988610c/go.mod h1:9i0oYbpJ8BhVGkXDKdXKfFthX1JUNfXjeTp944W8TGM=
+github.com/hajimehoshi/oto/v2 v2.2.0-alpha.3.0.20220630171212-19c3101d3014 h1:CzwUmBzSfGTCrUXwnuhEbZf3QFzr1qYolBEYE4VxvLI=
+github.com/hajimehoshi/oto/v2 v2.2.0-alpha.3.0.20220630171212-19c3101d3014/go.mod h1:9i0oYbpJ8BhVGkXDKdXKfFthX1JUNfXjeTp944W8TGM=
 github.com/jakecoffman/cp v1.2.0 h1:ZdCFqHglNYJibiIeRvpAktJ7ZuWUnh0cnBsZNKVbY3A=
 github.com/jakecoffman/cp v1.2.0/go.mod h1:JjY/Fp6d8E1CHnu74gWNnU0+b9VzEdUVPoJxg2PsTQg=
 github.com/jezek/xgb v1.0.1 h1:YUGhxps0aR7J2Xplbs23OHnV1mWaxFVcOl9b+1RQkt8=