audio: Remove NewLoop (#200)

exp/audio/loop.go

@@ -1,68 +0,0 @@
-// Copyright 2016 Hajime Hoshi
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package audio
-
-import (
-	"io"
-)
-
-type Loop struct {
-	stream ReadSeekCloser
-	size   int64
-}
-
-func NewLoop(stream ReadSeekCloser, size int64) *Loop {
-	return &Loop{
-		stream: stream,
-		size:   size,
-	}
-}
-
-func (l *Loop) Read(b []byte) (int, error) {
-	n, err := l.stream.Read(b)
-	if err == io.EOF {
-		if _, err := l.Seek(0, 0); err != nil {
-			return 0, err
-		}
-		err = nil
-	}
-	return n, err
-}
-
-func (l *Loop) Seek(offset int64, whence int) (int64, error) {
-	next := int64(0)
-	switch whence {
-	case 0:
-		next = offset
-	case 1:
-		current, err := l.stream.Seek(0, 1)
-		if err != nil {
-			return 0, err
-		}
-		next = current + offset
-	case 2:
-		panic("audio: whence must be 0 or 1 for a loop stream")
-	}
-	next %= l.size
-	pos, err := l.stream.Seek(next, 0)
-	if err != nil {
-		return 0, err
-	}
-	return pos, nil
-}
-
-func (l *Loop) Close() error {
-	return l.stream.Close()
-}