ebiten/exp/audio/vorbis/vorbis.go
2016-03-13 03:15:19 +09:00

64 lines
1.6 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.
// +build !js
package vorbis
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"github.com/hajimehoshi/ebiten/exp/audio"
"github.com/hajimehoshi/go-vorbis"
)
type stream struct {
buf *bytes.Reader
}
func Decode(context *audio.Context, src io.Reader) (io.ReadSeeker, error) {
decoded, channels, sampleRate, err := vorbis.Decode(src)
if err != nil {
return nil, err
}
if channels != 2 {
return nil, errors.New("audio: number of channels must be 2")
}
if sampleRate != context.SampleRate() {
return nil, fmt.Errorf("audio: sample rate must be %d but %d", context.SampleRate(), sampleRate)
}
// TODO: Read all data once so that Seek can be implemented easily.
// We should look for a wiser way.
b, err := ioutil.ReadAll(decoded)
if err != nil {
return nil, err
}
s := &stream{
buf: bytes.NewReader(b),
}
return s, nil
}
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)
}