ebiten/exp/audio/vorbis/decode.go

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// 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/ioutil"
"github.com/hajimehoshi/ebiten/exp/audio"
)
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// TODO: src should be ReadCloser?
func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
decoded, channels, sampleRate, err := decode(src)
if err != nil {
return nil, err
}
// TODO: Remove this magic number
if channels != 2 {
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return nil, errors.New("vorbis: number of channels must be 2")
}
if sampleRate != context.SampleRate() {
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return nil, fmt.Errorf("vorbis: 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
}
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s := &Stream{
buf: bytes.NewReader(b),
}
return s, nil
}