mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
// Copyright 2017 The Ebiten Authors
|
|
//
|
|
// 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.
|
|
|
|
// +build !js
|
|
|
|
// Package mp3 provides MP3 decoder.
|
|
package mp3
|
|
|
|
import (
|
|
"github.com/hajimehoshi/go-mp3"
|
|
|
|
"github.com/hajimehoshi/ebiten/audio"
|
|
"github.com/hajimehoshi/ebiten/audio/internal/convert"
|
|
)
|
|
|
|
type Stream struct {
|
|
inner audio.ReadSeekCloser
|
|
size int64
|
|
}
|
|
|
|
// Read is implementation of io.Reader's Read.
|
|
func (s *Stream) Read(buf []byte) (int, error) {
|
|
return s.inner.Read(buf)
|
|
}
|
|
|
|
// Seek is implementation of io.Seeker's Seek.
|
|
func (s *Stream) Seek(offset int64, whence int) (int64, error) {
|
|
return s.inner.Seek(offset, whence)
|
|
}
|
|
|
|
// Read is implementation of io.Closer's Close.
|
|
func (s *Stream) Close() error {
|
|
return s.inner.Close()
|
|
}
|
|
|
|
// Size returns the size of decoded stream in bytes.
|
|
func (s *Stream) Size() int64 {
|
|
return s.size
|
|
}
|
|
|
|
func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
|
|
d, err := mp3.NewDecoder(src)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// TODO: Resampling
|
|
var s audio.ReadSeekCloser = d
|
|
size := d.Length()
|
|
if d.SampleRate() != context.SampleRate() {
|
|
r := convert.NewResampling(s, d.Length(), d.SampleRate(), context.SampleRate())
|
|
s = r
|
|
size = r.Size()
|
|
}
|
|
return &Stream{
|
|
inner: s,
|
|
size: size,
|
|
}, nil
|
|
}
|