mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
internal/cbackend: simplify the audio API
This commit is contained in:
Hajime Hoshi
parent
e6131894a7
commit
011e5061df
@ -19,8 +19,6 @@ package cbackend
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import (
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"io"
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"runtime"
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"sync"
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"github.com/hajimehoshi/ebiten/v2/internal/cbackend"
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)
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@ -29,31 +27,25 @@ type Context struct {
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sampleRate int
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channelNum int
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bitDepthInBytes int
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players *players
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}
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func NewContext(sampleRate, channelNum, bitDepthInBytes int) (*Context, chan struct{}, error) {
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cbackend.OpenAudio(sampleRate, channelNum, bitDepthInBytes)
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c := &Context{
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sampleRate: sampleRate,
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channelNum: channelNum,
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bitDepthInBytes: bitDepthInBytes,
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players: newPlayers(),
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}
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cbackend.OpenAudio(sampleRate, channelNum, c.players.read)
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ready := make(chan struct{})
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close(ready)
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return c, ready, nil
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}
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func (c *Context) NewPlayer(r io.Reader) *Player {
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cond := sync.NewCond(&sync.Mutex{})
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p := &Player{
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context: c,
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src: r,
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volume: 1,
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cond: cond,
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onWritten: cond.Signal,
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}
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runtime.SetFinalizer(p, (*Player).Close)
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return p
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func (c *Context) NewPlayer(src io.Reader) *Player {
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return newPlayer(c, src)
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}
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func (c *Context) Suspend() error {
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@ -70,259 +62,6 @@ func (c *Context) Err() error {
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return nil
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}
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func (c *Context) oneBufferSize() int {
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return int(float64(c.sampleRate*c.channelNum*c.bitDepthInBytes) * cbackend.AudioBufferSizeInSeconds())
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}
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func (c *Context) MaxBufferSize() int {
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// TODO: This must be audio.maxBufferSize(p.context.sampleRate). Avoid the duplication.
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return c.oneBufferSize() * 2
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}
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type playerState int
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const (
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playerStatePaused playerState = iota
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playerStatePlaying
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playerStateClosed
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)
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type Player struct {
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context *Context
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src io.Reader
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v *cbackend.AudioPlayer
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state playerState
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volume float64
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cond *sync.Cond
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err error
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buf []byte
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onWritten func()
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}
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func (p *Player) Pause() {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.state == playerStateClosed {
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return
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}
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if p.v == nil {
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return
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}
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p.v.Pause()
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p.state = playerStatePaused
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p.cond.Signal()
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}
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func (p *Player) Play() {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.state == playerStateClosed {
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return
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}
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var runloop bool
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if p.v == nil {
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p.v = cbackend.CreateAudioPlayer(p.onWritten)
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runloop = true
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}
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p.v.SetVolume(p.volume)
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p.v.Play()
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// Prepare the first data as soon as possible, or the audio can get stuck.
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// TODO: Get the appropriate buffer size from the C++ side.
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if p.buf == nil {
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n := p.context.oneBufferSize()
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if max := p.context.MaxBufferSize() - p.UnplayedBufferSize(); n > max {
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n = max
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}
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p.buf = make([]byte, n)
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}
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n, err := p.src.Read(p.buf)
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if err != nil && err != io.EOF {
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p.setErrorImpl(err)
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return
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}
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if n > 0 {
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p.writeImpl(p.buf[:n])
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}
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if runloop {
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go p.loop()
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}
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p.state = playerStatePlaying
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p.cond.Signal()
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}
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func (p *Player) IsPlaying() bool {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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return p.state == playerStatePlaying
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}
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func (p *Player) Reset() {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.state == playerStateClosed {
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return
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}
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p.state = playerStatePaused
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if p.v == nil {
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return
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}
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p.v.Close(true)
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p.v = nil
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p.cond.Signal()
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}
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func (p *Player) Volume() float64 {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.v == nil {
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return p.volume
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}
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return p.v.Volume()
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}
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func (p *Player) SetVolume(volume float64) {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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p.volume = volume
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if p.v == nil {
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return
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}
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p.v.SetVolume(volume)
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}
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func (p *Player) UnplayedBufferSize() int {
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if p.v == nil {
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return 0
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}
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return p.v.UnplayedBufferSize()
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}
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func (p *Player) Err() error {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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return p.err
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}
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func (p *Player) Close() error {
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runtime.SetFinalizer(p, nil)
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return p.close(true)
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}
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func (p *Player) close(remove bool) error {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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return p.closeImpl(remove)
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}
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func (p *Player) closeImpl(remove bool) error {
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if p.state == playerStateClosed {
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return p.err
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}
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if p.v != nil {
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p.v.Close(false)
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p.v = nil
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}
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if remove {
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p.state = playerStateClosed
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p.onWritten = nil
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} else {
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p.state = playerStatePaused
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}
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p.cond.Signal()
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return p.err
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}
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func (p *Player) setError(err error) {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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p.setErrorImpl(err)
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}
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func (p *Player) setErrorImpl(err error) {
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if p.state != playerStateClosed && p.v != nil {
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p.v.Close(true)
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p.v = nil
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}
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p.err = err
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p.state = playerStateClosed
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p.cond.Signal()
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}
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func (p *Player) shouldWait() bool {
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if p.v == nil {
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return false
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}
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switch p.state {
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case playerStatePaused:
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return true
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case playerStatePlaying:
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return p.v.UnplayedBufferSize() >= p.context.MaxBufferSize()
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}
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return false
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}
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func (p *Player) waitUntilUnpaused() bool {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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for p.shouldWait() {
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p.cond.Wait()
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}
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return p.v != nil && p.state == playerStatePlaying
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}
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func (p *Player) writeImpl(buf []byte) {
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if p.state == playerStateClosed {
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return
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}
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if p.v == nil {
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return
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}
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p.v.Write(buf)
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}
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func (p *Player) loop() {
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const readChunkSize = 4096
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buf := make([]byte, readChunkSize)
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for {
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if !p.waitUntilUnpaused() {
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return
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}
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p.cond.L.Lock()
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n, err := p.src.Read(buf)
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if err != nil && err != io.EOF {
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p.setErrorImpl(err)
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p.cond.L.Unlock()
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return
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}
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if n > 0 {
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p.writeImpl(buf[:n])
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}
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if err == io.EOF {
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p.closeImpl(false)
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p.cond.L.Unlock()
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return
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}
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p.cond.L.Unlock()
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}
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func (c *Context) bufferSize() int {
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return c.sampleRate * c.channelNum * c.bitDepthInBytes / 4 // 0.25[s]
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}
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400
audio/internal/cbackend/player.go
Normal file
400
audio/internal/cbackend/player.go
Normal file
@ -0,0 +1,400 @@
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// Copyright 2021 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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//go:build ebitencbackend
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// +build ebitencbackend
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// TODO: This implementation is very similar to github.com/hajimehoshi/oto/v2's player_notjs.go
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// Unify them if possible.
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package cbackend
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import (
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"io"
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"runtime"
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"sync"
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"sync/atomic"
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)
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type playerState int
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const (
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playerPaused playerState = iota
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playerPlay
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playerClosed
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)
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type players struct {
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players map[*playerImpl]struct{}
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buf []float32
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cond *sync.Cond
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}
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func newPlayers() *players {
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p := &players{
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cond: sync.NewCond(&sync.Mutex{}),
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}
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go p.loop()
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return p
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}
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func (ps *players) shouldWait() bool {
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for p := range ps.players {
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if p.canReadSourceToBuffer() {
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return false
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}
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}
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return true
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}
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func (ps *players) wait() {
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ps.cond.L.Lock()
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defer ps.cond.L.Unlock()
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for ps.shouldWait() {
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ps.cond.Wait()
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}
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}
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func (ps *players) loop() {
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var players []*playerImpl
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for {
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ps.wait()
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ps.cond.L.Lock()
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players = players[:0]
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for p := range ps.players {
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players = append(players, p)
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}
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ps.cond.L.Unlock()
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for _, p := range players {
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p.readSourceToBuffer()
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}
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}
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}
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func (ps *players) addPlayer(player *playerImpl) {
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ps.cond.L.Lock()
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defer ps.cond.L.Unlock()
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if ps.players == nil {
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ps.players = map[*playerImpl]struct{}{}
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}
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ps.players[player] = struct{}{}
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ps.cond.Signal()
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}
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func (ps *players) removePlayer(player *playerImpl) {
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ps.cond.L.Lock()
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defer ps.cond.L.Unlock()
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delete(ps.players, player)
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ps.cond.Signal()
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}
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func (ps *players) read(buf []float32) {
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ps.cond.L.Lock()
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players := make([]*playerImpl, 0, len(ps.players))
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for p := range ps.players {
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players = append(players, p)
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}
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ps.cond.L.Unlock()
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for i := range buf {
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buf[i] = 0
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}
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for _, p := range players {
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p.readBufferAndAdd(buf)
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}
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ps.cond.Signal()
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}
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type Player struct {
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p *playerImpl
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}
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type playerImpl struct {
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context *Context
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src io.Reader
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volume float64
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err atomic.Value
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state playerState
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tmpbuf []byte
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buf []byte
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eof bool
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m sync.Mutex
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}
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func newPlayer(context *Context, src io.Reader) *Player {
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p := &Player{
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p: &playerImpl{
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context: context,
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src: src,
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volume: 1,
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},
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}
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runtime.SetFinalizer(p, (*Player).Close)
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return p
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}
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func (p *Player) Err() error {
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return p.p.Err()
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}
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func (p *playerImpl) Err() error {
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if err := p.err.Load(); err != nil {
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return err.(error)
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}
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return nil
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}
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func (p *Player) Play() {
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p.p.Play()
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}
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func (p *playerImpl) Play() {
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ch := make(chan struct{})
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go func() {
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p.m.Lock()
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defer p.m.Unlock()
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close(ch)
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p.playImpl()
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}()
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<-ch
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}
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func (p *playerImpl) ensureTmpBuf() []byte {
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if p.tmpbuf == nil {
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p.tmpbuf = make([]byte, p.context.bufferSize())
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}
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return p.tmpbuf
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}
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func (p *playerImpl) playImpl() {
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if p.err.Load() != nil {
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return
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}
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if p.state != playerPaused {
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return
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}
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if !p.eof {
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buf := p.ensureTmpBuf()
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for len(p.buf) < p.context.bufferSize() {
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n, err := p.src.Read(buf)
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if err != nil && err != io.EOF {
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p.setErrorImpl(err)
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return
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}
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p.buf = append(p.buf, buf[:n]...)
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if err == io.EOF {
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if len(p.buf) == 0 {
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p.eof = true
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}
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break
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}
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}
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}
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if !p.eof || len(p.buf) > 0 {
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p.state = playerPlay
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}
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p.m.Unlock()
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p.context.players.addPlayer(p)
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p.m.Lock()
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}
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func (p *Player) Pause() {
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p.p.Pause()
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}
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func (p *playerImpl) Pause() {
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p.m.Lock()
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defer p.m.Unlock()
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if p.state != playerPlay {
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return
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}
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p.state = playerPaused
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}
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func (p *Player) Reset() {
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p.p.Reset()
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}
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func (p *playerImpl) Reset() {
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p.m.Lock()
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defer p.m.Unlock()
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p.resetImpl()
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}
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func (p *playerImpl) resetImpl() {
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if p.state == playerClosed {
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return
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}
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p.state = playerPaused
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p.buf = p.buf[:0]
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p.eof = false
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}
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func (p *Player) IsPlaying() bool {
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return p.p.IsPlaying()
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}
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func (p *playerImpl) IsPlaying() bool {
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p.m.Lock()
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defer p.m.Unlock()
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return p.state == playerPlay
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}
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func (p *Player) Volume() float64 {
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return p.p.Volume()
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}
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||||
func (p *playerImpl) Volume() float64 {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
return p.volume
|
||||
}
|
||||
|
||||
func (p *Player) SetVolume(volume float64) {
|
||||
p.p.SetVolume(volume)
|
||||
}
|
||||
|
||||
func (p *playerImpl) SetVolume(volume float64) {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
p.volume = volume
|
||||
}
|
||||
|
||||
func (p *Player) UnplayedBufferSize() int {
|
||||
return p.p.UnplayedBufferSize()
|
||||
}
|
||||
|
||||
func (p *playerImpl) UnplayedBufferSize() int {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
return len(p.buf)
|
||||
}
|
||||
|
||||
func (p *Player) Close() error {
|
||||
runtime.SetFinalizer(p, nil)
|
||||
return p.p.Close()
|
||||
}
|
||||
|
||||
func (p *playerImpl) Close() error {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
return p.closeImpl()
|
||||
}
|
||||
|
||||
func (p *playerImpl) closeImpl() error {
|
||||
p.m.Unlock()
|
||||
p.context.players.removePlayer(p)
|
||||
p.m.Lock()
|
||||
|
||||
if p.state == playerClosed {
|
||||
return nil
|
||||
}
|
||||
p.state = playerClosed
|
||||
p.buf = nil
|
||||
if err := p.err.Load(); err != nil {
|
||||
return err.(error)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (p *playerImpl) readBufferAndAdd(buf []float32) int {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
|
||||
if p.state != playerPlay {
|
||||
return 0
|
||||
}
|
||||
|
||||
bitDepthInBytes := p.context.bitDepthInBytes
|
||||
n := len(p.buf) / bitDepthInBytes
|
||||
if n > len(buf) {
|
||||
n = len(buf)
|
||||
}
|
||||
volume := float32(p.volume)
|
||||
src := p.buf[:n*bitDepthInBytes]
|
||||
|
||||
for i := 0; i < n; i++ {
|
||||
var v float32
|
||||
switch bitDepthInBytes {
|
||||
case 1:
|
||||
v8 := src[i]
|
||||
v = float32(v8-(1<<7)) / (1 << 7)
|
||||
case 2:
|
||||
v16 := int16(src[2*i]) | (int16(src[2*i+1]) << 8)
|
||||
v = float32(v16) / (1 << 15)
|
||||
}
|
||||
buf[i] += v * volume
|
||||
}
|
||||
|
||||
copy(p.buf, p.buf[n*bitDepthInBytes:])
|
||||
p.buf = p.buf[:len(p.buf)-n*bitDepthInBytes]
|
||||
|
||||
return n
|
||||
}
|
||||
|
||||
func (p *playerImpl) canReadSourceToBuffer() bool {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
|
||||
if p.eof {
|
||||
return false
|
||||
}
|
||||
return len(p.buf) < p.context.bufferSize()
|
||||
}
|
||||
|
||||
func (p *playerImpl) readSourceToBuffer() {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
|
||||
if p.err.Load() != nil {
|
||||
return
|
||||
}
|
||||
if p.state == playerClosed {
|
||||
return
|
||||
}
|
||||
|
||||
if len(p.buf) >= p.context.bufferSize() {
|
||||
return
|
||||
}
|
||||
|
||||
buf := p.ensureTmpBuf()
|
||||
n, err := p.src.Read(buf)
|
||||
|
||||
if err != nil && err != io.EOF {
|
||||
p.setErrorImpl(err)
|
||||
return
|
||||
}
|
||||
|
||||
p.buf = append(p.buf, buf[:n]...)
|
||||
if err == io.EOF && len(p.buf) == 0 {
|
||||
p.state = playerPaused
|
||||
p.eof = true
|
||||
}
|
||||
}
|
||||
|
||||
func (p *playerImpl) setErrorImpl(err error) {
|
||||
p.err.Store(err)
|
||||
p.closeImpl()
|
||||
}
|
||||
@ -51,29 +51,18 @@ package cbackend
|
||||
// void EbitenGetTouches(struct Touch* touches);
|
||||
//
|
||||
// // Audio
|
||||
// // TODO: Implement mixing on Go side and reduce the API.
|
||||
// typedef void (*OnWrittenCallback)(int id);
|
||||
// void EbitenOpenAudio(int sample_rate, int channel_num, int bit_depth_in_bytes);
|
||||
// typedef void (*OnReadCallback)(float* buf, size_t length);
|
||||
// void EbitenOpenAudio(int sample_rate, int channel_num, OnReadCallback on_read_callback);
|
||||
// void EbitenCloseAudio();
|
||||
// int EbitenCreateAudioPlayer(OnWrittenCallback on_written_callback);
|
||||
// void EbitenAudioPlayerPlay(int id);
|
||||
// void EbitenAudioPlayerPause(int id);
|
||||
// void EbitenAudioPlayerWrite(int id, uint8_t* data, int length);
|
||||
// void EbitenAudioPlayerClose(int id, int immediately);
|
||||
// double EbitenAudioPlayerGetVolume(int id);
|
||||
// void EbitenAudioPlayerSetVolume(int id, double volume);
|
||||
// int EbitenAudioPlayerGetUnplayedBufferSize(int id);
|
||||
// float EbitenAudioBufferSizeInSeconds();
|
||||
//
|
||||
// void EbitenAudioPlayerOnWrittenCallback(int id);
|
||||
// static int EbitenCreateAudioPlayerProxy() {
|
||||
// return EbitenCreateAudioPlayer(EbitenAudioPlayerOnWrittenCallback);
|
||||
// void EbitenAudioOnReadCallback(float* buf, size_t length);
|
||||
// static void EbitenOpenAudioProxy(int sample_rate, int channel_num) {
|
||||
// EbitenOpenAudio(sample_rate, channel_num, EbitenAudioOnReadCallback);
|
||||
// }
|
||||
import "C"
|
||||
|
||||
import (
|
||||
"runtime"
|
||||
"sync"
|
||||
"reflect"
|
||||
"unsafe"
|
||||
|
||||
"github.com/hajimehoshi/ebiten/v2/internal/driver"
|
||||
@ -170,80 +159,23 @@ func AppendTouches(touches []Touch) []Touch {
|
||||
return touches
|
||||
}
|
||||
|
||||
func OpenAudio(sampleRate, channelNum, bitDepthInBytes int) {
|
||||
C.EbitenOpenAudio(C.int(sampleRate), C.int(channelNum), C.int(bitDepthInBytes))
|
||||
var onReadCallback func(buf []float32)
|
||||
|
||||
func OpenAudio(sampleRate, channelNum int, onRead func(buf []float32)) {
|
||||
C.EbitenOpenAudioProxy(C.int(sampleRate), C.int(channelNum))
|
||||
onReadCallback = onRead
|
||||
}
|
||||
|
||||
func CloseAudio() {
|
||||
C.EbitenCloseAudio()
|
||||
}
|
||||
|
||||
func CreateAudioPlayer(onWritten func()) *AudioPlayer {
|
||||
id := C.EbitenCreateAudioPlayerProxy()
|
||||
p := &AudioPlayer{
|
||||
id: id,
|
||||
}
|
||||
onWrittenCallbacksM.Lock()
|
||||
defer onWrittenCallbacksM.Unlock()
|
||||
onWrittenCallbacks[id] = onWritten
|
||||
return p
|
||||
}
|
||||
|
||||
func AudioBufferSizeInSeconds() float64 {
|
||||
return float64(C.EbitenAudioBufferSizeInSeconds())
|
||||
}
|
||||
|
||||
type AudioPlayer struct {
|
||||
id C.int
|
||||
}
|
||||
|
||||
func (p *AudioPlayer) Play() {
|
||||
C.EbitenAudioPlayerPlay(p.id)
|
||||
}
|
||||
|
||||
func (p *AudioPlayer) Pause() {
|
||||
C.EbitenAudioPlayerPause(p.id)
|
||||
}
|
||||
|
||||
func (p *AudioPlayer) Write(buf []byte) {
|
||||
C.EbitenAudioPlayerWrite(p.id, (*C.uint8_t)(unsafe.Pointer(&buf[0])), C.int(len(buf)))
|
||||
runtime.KeepAlive(buf)
|
||||
}
|
||||
|
||||
func (p *AudioPlayer) Close(immediately bool) {
|
||||
var i C.int
|
||||
if immediately {
|
||||
i = 1
|
||||
}
|
||||
C.EbitenAudioPlayerClose(p.id, i)
|
||||
|
||||
onWrittenCallbacksM.Lock()
|
||||
defer onWrittenCallbacksM.Unlock()
|
||||
delete(onWrittenCallbacks, p.id)
|
||||
}
|
||||
|
||||
func (p *AudioPlayer) Volume() float64 {
|
||||
return float64(C.EbitenAudioPlayerGetVolume(p.id))
|
||||
}
|
||||
|
||||
func (p *AudioPlayer) SetVolume(volume float64) {
|
||||
C.EbitenAudioPlayerSetVolume(p.id, C.double(volume))
|
||||
}
|
||||
|
||||
func (p *AudioPlayer) UnplayedBufferSize() int {
|
||||
return int(C.EbitenAudioPlayerGetUnplayedBufferSize(p.id))
|
||||
}
|
||||
|
||||
var (
|
||||
onWrittenCallbacks = map[C.int]func(){}
|
||||
onWrittenCallbacksM sync.Mutex
|
||||
)
|
||||
|
||||
//export EbitenAudioPlayerOnWrittenCallback
|
||||
func EbitenAudioPlayerOnWrittenCallback(id C.int) {
|
||||
onWrittenCallbacksM.Lock()
|
||||
defer onWrittenCallbacksM.Unlock()
|
||||
if c, ok := onWrittenCallbacks[id]; ok {
|
||||
c()
|
||||
}
|
||||
//export EbitenAudioOnReadCallback
|
||||
func EbitenAudioOnReadCallback(buf *C.float, length C.size_t) {
|
||||
var s []float32
|
||||
h := (*reflect.SliceHeader)(unsafe.Pointer(&s))
|
||||
h.Data = uintptr(unsafe.Pointer(buf))
|
||||
h.Len = int(length)
|
||||
h.Cap = int(length)
|
||||
onReadCallback(s)
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user