mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
// 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) ReadSeekCloser {
|
|
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()
|
|
}
|