forked from hajimehoshi/ebiten
/
decode.go
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/
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 (
"errors"
"fmt"
"github.com/hajimehoshi/ebiten/audio"
)
type Stream struct {
decoded *decoded
}
func (s *Stream) Read(p []byte) (int, error) {
return s.decoded.Read(p)
}
func (s *Stream) Seek(offset int64, whence int) (int64, error) {
return s.decoded.Seek(offset, whence)
}
func (s *Stream) Close() error {
return s.decoded.Close()
}
// Size returns the size of decoded stream in bytes.
func (s *Stream) Size() int64 {
return s.decoded.Size()
}
// Decode decodes Ogg/Vorbis data to playable stream.
//
// The sample rate must be same as that of audio context.
func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
decoded, channelNum, sampleRate, err := decode(src)
if err != nil {
return nil, err
}
// TODO: Remove this magic number
if channelNum != 2 {
return nil, errors.New("vorbis: number of channels must be 2")
}
if sampleRate != context.SampleRate() {
return nil, fmt.Errorf("vorbis: sample rate must be %d but %d", context.SampleRate(), sampleRate)
}
s := &Stream{
decoded: decoded,
}
return s, nil
}