ebiten/exp/audio/vorbis/stream.go
Hajime Hoshi eb0d650612 tmp
2016-03-18 02:42:47 +09:00

45 lines
1.1 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 vorbis
import (
"bytes"
"io"
"time"
)
type Stream interface {
io.ReadSeeker
Len() time.Duration
}
type stream struct {
buf *bytes.Reader
sampleRate int
}
func (s *stream) Read(p []byte) (int, error) {
return s.buf.Read(p)
}
func (s *stream) Seek(offset int64, whence int) (int64, error) {
return s.buf.Seek(offset, whence)
}
func (s *stream) Len() time.Duration {
const bytesPerSample = 4
return time.Duration(s.buf.Len()/bytesPerSample) * time.Second / time.Duration(s.sampleRate)
}