audio: Deprecate Size() and add Length() (#466)

audio/internal/convert/resampling.go

@@ -91,7 +91,7 @@ func NewResampling(source audio.ReadSeekCloser, size int64, from, to int) *Resam
 	return r
 }
 
-func (r *Resampling) Size() int64 {
+func (r *Resampling) Length() int64 {
 	s := int64(float64(r.size) * float64(r.to) / float64(r.from))
 	return s / 4 * 4
 }
@@ -204,12 +204,12 @@ func (r *Resampling) at(t int64) (float64, float64, error) {
 }
 
 func (r *Resampling) Read(b []uint8) (int, error) {
-	if r.pos == r.Size() {
+	if r.pos == r.Length() {
 		return 0, io.EOF
 	}
 	n := len(b) / 4 * 4
-	if r.Size()-r.pos <= int64(n) {
+	if r.Length()-r.pos <= int64(n) {
-		n = int(r.Size() - r.pos)
+		n = int(r.Length() - r.pos)
 	}
 	for i := 0; i < n/4; i++ {
 		l, r, err := r.at(r.pos/4 + int64(i))
@@ -234,13 +234,13 @@ func (r *Resampling) Seek(offset int64, whence int) (int64, error) {
 	case io.SeekCurrent:
 		r.pos += offset
 	case io.SeekEnd:
-		r.pos += r.Size() + offset
+		r.pos += r.Length() + offset
 	}
 	if r.pos < 0 {
 		r.pos = 0
 	}
-	if r.Size() <= r.pos {
+	if r.Length() <= r.pos {
-		r.pos = r.Size()
+		r.pos = r.Length()
 	}
 	return r.pos, nil
 }

audio/mp3/decode_js.go

@@ -83,7 +83,7 @@ func (s *Stream) Seek(offset int64, whence int) (int64, error) {
 	case io.SeekCurrent:
 		next = int64(s.posInBytes) + offset
 	case io.SeekEnd:
-		next = s.Size() + offset
+		next = s.Length() + offset
 	}
 	s.posInBytes = int(next)
 	return next, nil
@@ -93,10 +93,15 @@ func (s *Stream) Close() error {
 	return nil
 }
 
-func (s *Stream) Size() int64 {
+func (s *Stream) Length() int64 {
 	return int64(len(s.leftData) * 4)
 }
 
+// Size is deprecated as of 1.6.0-alpha. Use Length instead.
+func (s *Stream) Size() int64 {
+	return s.Length()
+}
+
 // seekNextFrame seeks the next frame and returns the new buffer with the new position.
 // seekNextFrame also returns true when seeking is successful, or false otherwise.
 //

audio/mp3/decode_notjs.go

@@ -57,14 +57,19 @@ func (s *Stream) Close() error {
 	return s.orig.Close()
 }
 
-// Size returns the size of decoded stream in bytes.
+// Length returns the size of decoded stream in bytes.
-func (s *Stream) Size() int64 {
+func (s *Stream) Length() int64 {
 	if s.resampling != nil {
-		return s.resampling.Size()
+		return s.resampling.Length()
 	}
 	return s.orig.Length()
 }
 
+// Size is deprecated as of 1.6.0-alpha. Use Length instead.
+func (s *Stream) Size() int64 {
+	return s.Length()
+}
+
 // Decode decodes MP3 source and returns a decoded stream.
 //
 // Decode returns error when decoding fails or IO error happens.

audio/vorbis/vorbis.go

@@ -48,11 +48,16 @@ func (s *Stream) Close() error {
 	return s.decoded.Close()
 }
 
-// Size returns the size of decoded stream in bytes.
+// Length returns the size of decoded stream in bytes.
-func (s *Stream) Size() int64 {
+func (s *Stream) Length() int64 {
 	return s.size
 }
 
+// Size is deprecated as of version 1.6.0-alpha. Use Length instead.
+func (s *Stream) Size() int64 {
+	return s.Length()
+}
+
 type decoded struct {
 	data       []float32
 	totalBytes int
@@ -141,7 +146,7 @@ func (d *decoded) Close() error {
 	return nil
 }
 
-func (d *decoded) Size() int64 {
+func (d *decoded) Length() int64 {
 	return int64(d.totalBytes)
 }
 
@@ -182,7 +187,7 @@ func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
 		return nil, fmt.Errorf("vorbis: number of channels must be 1 or 2 but was %d", channelNum)
 	}
 	var s audio.ReadSeekCloser = decoded
-	size := decoded.Size()
+	size := decoded.Length()
 	if channelNum == 1 {
 		s = convert.NewStereo16(s, true, false)
 		size *= 2
@@ -190,7 +195,7 @@ func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
 	if sampleRate != context.SampleRate() {
 		r := convert.NewResampling(s, size, sampleRate, context.SampleRate())
 		s = r
-		size = r.Size()
+		size = r.Length()
 	}
 	return &Stream{decoded: s, size: size}, nil
 }

audio/wav/decode.go

@@ -47,11 +47,16 @@ func (s *Stream) Close() error {
 	return s.inner.Close()
 }
 
-// Size returns the size of decoded stream in bytes.
+// Length returns the size of decoded stream in bytes.
-func (s *Stream) Size() int64 {
+func (s *Stream) Length() int64 {
 	return s.size
 }
 
+// Size is deprecated as of version 1.6.0-alpha. Use Length instead.
+func (s *Stream) Size() int64 {
+	return s.Length()
+}
+
 type stream struct {
 	src        audio.ReadSeekCloser
 	headerSize int64
@@ -103,8 +108,8 @@ func (s *stream) Close() error {
 	return s.src.Close()
 }
 
-// Size returns the size of decoded stream in bytes.
+// Length returns the size of decoded stream in bytes.
-func (s *stream) Size() int64 {
+func (s *stream) Length() int64 {
 	return s.dataSize
 }
 
@@ -221,7 +226,7 @@ chunks:
 	if sampleRateFrom != sampleRateTo {
 		r := convert.NewResampling(s, dataSize, sampleRateFrom, sampleRateTo)
 		s = r
-		dataSize = r.Size()
+		dataSize = r.Length()
 	}
 	return &Stream{inner: s, size: dataSize}, nil
 }

examples/audio/main.go

@@ -126,7 +126,7 @@ func NewPlayer(audioContext *audio.Context) (*Player, error) {
 		},
 		audioContext: audioContext,
 		audioPlayer:  p,
-		total:        time.Second * time.Duration(s.Size()) / bytesPerSample / sampleRate,
+		total:        time.Second * time.Duration(s.Length()) / bytesPerSample / sampleRate,
 		volume128:    128,
 		seCh:         make(chan []uint8),
 	}

examples/audioinfiniteloop/main.go

@@ -57,7 +57,7 @@ func update(screen *ebiten.Image) error {
 			return err
 		}
 
-		s := audio.NewInfiniteLoop(wavS, wavS.Size())
+		s := audio.NewInfiniteLoop(wavS, wavS.Length())
 
 		player, err = audio.NewPlayer(audioContext, s)
 		if err != nil {