mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !js
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// Package mp3 provides MP3 decoder.
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package mp3
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import (
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"github.com/hajimehoshi/go-mp3"
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"github.com/hajimehoshi/ebiten/audio"
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"github.com/hajimehoshi/ebiten/audio/internal/convert"
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)
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type Stream struct {
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inner audio.ReadSeekCloser
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size int64
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}
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// Read is implementation of io.Reader's Read.
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func (s *Stream) Read(buf []byte) (int, error) {
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return s.inner.Read(buf)
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}
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// Seek is implementation of io.Seeker's Seek.
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func (s *Stream) Seek(offset int64, whence int) (int64, error) {
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return s.inner.Seek(offset, whence)
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}
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// Read is implementation of io.Closer's Close.
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func (s *Stream) Close() error {
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return s.inner.Close()
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}
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// Size returns the size of decoded stream in bytes.
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func (s *Stream) Size() int64 {
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return s.size
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}
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func Decode(context *audio.Context, src audio.ReadSeekCloser) (*Stream, error) {
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d, err := mp3.Decode(src)
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if err != nil {
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return nil, err
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}
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// TODO: Resampling
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var s audio.ReadSeekCloser = convert.NewSeeker(d)
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size := d.Length()
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if d.SampleRate() != context.SampleRate() {
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s = convert.NewResampling(s, d.Length(), d.SampleRate(), context.SampleRate())
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size = size * int64(context.SampleRate()) / int64(d.SampleRate())
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}
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return &Stream{
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inner: s,
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size: size,
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}, nil
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}
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