mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
134 lines
2.8 KiB
Go
134 lines
2.8 KiB
Go
// Copyright 2019 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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package audio
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import (
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"io"
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"sync"
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"github.com/hajimehoshi/oto"
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"github.com/hajimehoshi/ebiten/internal/hooks"
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)
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type context interface {
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NewPlayer() io.WriteCloser
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io.Closer
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}
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var contextForTesting context
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type otoContext struct {
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sampleRate int
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initCh <-chan struct{}
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c *oto.Context
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once sync.Once
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}
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func (c *otoContext) NewPlayer() io.WriteCloser {
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return &otoPlayer{c: c}
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}
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func (c *otoContext) Close() error {
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if c.c == nil {
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return nil
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}
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return c.c.Close()
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}
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func (c *otoContext) ensureContext() error {
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var err error
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c.once.Do(func() {
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<-c.initCh
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c.c, err = oto.NewContext(c.sampleRate, channelNum, bytesPerSample/channelNum, bufferSize())
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})
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return err
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}
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type otoPlayer struct {
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c *otoContext
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p *oto.Player
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once sync.Once
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}
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func (p *otoPlayer) Write(buf []byte) (int, error) {
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// Initialize oto.Player lazily to enable calling NewContext in an 'init' function.
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// Accessing oto.Player functions requires the environment to be already initialized,
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// but if Ebiten is used for a shared library, the timing when init functions are called
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// is unexpectable.
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// e.g. a variable for JVM on Android might not be set.
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if err := p.ensurePlayer(); err != nil {
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return 0, err
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}
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return p.p.Write(buf)
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}
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func (p *otoPlayer) Close() error {
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if p.p == nil {
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return nil
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}
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return p.p.Close()
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}
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func (p *otoPlayer) ensurePlayer() error {
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if err := p.c.ensureContext(); err != nil {
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return err
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}
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p.once.Do(func() {
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p.p = p.c.c.NewPlayer()
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})
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return nil
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}
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func newContext(sampleRate int, initCh <-chan struct{}) context {
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if contextForTesting != nil {
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return contextForTesting
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}
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return &otoContext{
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sampleRate: sampleRate,
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initCh: initCh,
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}
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}
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type hook interface {
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OnSuspendAudio(f func())
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OnResumeAudio(f func())
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AppendHookOnBeforeUpdate(f func() error)
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}
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var hookForTesting hook
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func getHook() hook {
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if hookForTesting != nil {
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return hookForTesting
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}
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return &hookImpl{}
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}
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type hookImpl struct{}
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func (h *hookImpl) OnSuspendAudio(f func()) {
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hooks.OnSuspendAudio(f)
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}
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func (h *hookImpl) OnResumeAudio(f func()) {
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hooks.OnResumeAudio(f)
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}
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func (h *hookImpl) AppendHookOnBeforeUpdate(f func() error) {
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hooks.AppendHookOnBeforeUpdate(f)
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}
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