mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
// Copyright 2016 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package audio
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import (
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"io"
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)
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type Loop struct {
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stream ReadSeekCloser
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size int64
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}
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func NewLoop(stream ReadSeekCloser, size int64) ReadSeekCloser {
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return &Loop{
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stream: stream,
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size: size,
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}
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}
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func (l *Loop) Read(b []byte) (int, error) {
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n, err := l.stream.Read(b)
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if err == io.EOF {
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if _, err := l.Seek(0, 0); err != nil {
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return 0, err
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}
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err = nil
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}
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return n, err
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}
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func (l *Loop) Seek(offset int64, whence int) (int64, error) {
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next := int64(0)
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switch whence {
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case 0:
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next = offset
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case 1:
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current, err := l.stream.Seek(0, 1)
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if err != nil {
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return 0, err
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}
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next = current + offset
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case 2:
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panic("audio: whence must be 0 or 1 for a loop stream")
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}
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next %= l.size
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pos, err := l.stream.Seek(next, 0)
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if err != nil {
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return 0, err
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}
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return pos, nil
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}
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func (l *Loop) Close() error {
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return l.stream.Close()
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}
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