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audio: Re-use another OpenAL library for Mac OS X (#195)

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This commit is contained in:
Hajime Hoshi 2016-04-10 00:34:54 +09:00
parent 96296f076d
commit 509aa22bae
1 changed files with 68 additions and 71 deletions
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139
exp/audio/internal/driver/driver_openal.go
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@ -21,76 +21,72 @@ import (
"io"
"runtime"
"golang.org/x/mobile/exp/audio/al"
"github.com/hajimehoshi/go-openal/openal"
)
// As x/mobile/exp/audio/al is broken on Mac OS X (https://github.com/golang/go/issues/15075),
// let's use timshannon/go-openal.
const (
maxBufferNum = 8
)
type Player struct {
alSource al.Source
alBuffers []al.Buffer
alDevice *openal.Device
alSource openal.Source
alBuffers []openal.Buffer
source io.Reader
sampleRate int
isClosed bool
alFormat uint32
alFormat openal.Format
}
func alFormat(channelNum, bytesPerSample int) uint32 {
func alFormat(channelNum, bytesPerSample int) openal.Format {
switch {
case channelNum == 1 && bytesPerSample == 1:
return al.FormatMono8
return openal.FormatMono8
case channelNum == 1 && bytesPerSample == 2:
return al.FormatMono16
return openal.FormatMono16
case channelNum == 2 && bytesPerSample == 1:
return al.FormatStereo8
return openal.FormatStereo8
case channelNum == 2 && bytesPerSample == 2:
return al.FormatStereo16
return openal.FormatStereo16
}
panic(fmt.Sprintf("driver: invalid channel num (%d) or bytes per sample (%d)", channelNum, bytesPerSample))
}
func NewPlayer(src io.Reader, sampleRate, channelNum, bytesPerSample int) (*Player, error) {
var p *Player
var err error
ch := make(chan struct{})
go func() {
defer close(ch)
// Lock the OS thread to avoid switching the native threads during initialization.
// This seems to solve #195, but I'm not sure.
runtime.LockOSThread()
if e := al.OpenDevice(); e != nil {
err = fmt.Errorf("driver: OpenAL initialization failed: %v", e)
return
}
s := al.GenSources(1)
if e := al.Error(); e != 0 {
err = fmt.Errorf("driver: al.GenSources error: %d", e)
return
}
p = &Player{
alSource: s[0],
alBuffers: []al.Buffer{},
source: src,
sampleRate: sampleRate,
alFormat: alFormat(channelNum, bytesPerSample),
}
runtime.SetFinalizer(p, (*Player).Close)
bs := al.GenBuffers(maxBufferNum)
emptyBytes := make([]byte, bufferSize)
for _, b := range bs {
// Note that the third argument of only the first buffer is used.
b.BufferData(p.alFormat, emptyBytes, int32(p.sampleRate))
p.alSource.QueueBuffers(b)
}
al.PlaySources(p.alSource)
}()
<-ch
if err != nil {
return nil, err
d := openal.OpenDevice("")
if err := openal.Err(); err != nil {
return nil, fmt.Errorf("driver: OpenDevice: %v", err)
}
c := d.CreateContext()
if err := openal.Err(); err != nil {
return nil, fmt.Errorf("driver: CreateContext: %v", err)
}
c.Activate()
s := openal.NewSource()
if err := openal.Err(); err != nil {
return nil, fmt.Errorf("driver: NewSource: %v", err)
}
p := &Player{
alDevice: d,
alSource: s,
alBuffers: []openal.Buffer{},
source: src,
sampleRate: sampleRate,
alFormat: alFormat(channelNum, bytesPerSample),
}
runtime.SetFinalizer(p, (*Player).Close)
bs := openal.NewBuffers(maxBufferNum)
emptyBytes := make([]byte, bufferSize)
for _, b := range bs {
// Note that the third argument of only the first buffer is used.
b.SetData(p.alFormat, emptyBytes, int32(p.sampleRate))
p.alSource.QueueBuffer(b)
}
p.alSource.Play()
return p, nil
}
@ -100,19 +96,19 @@ const (
var (
tmpBuffer = make([]byte, bufferSize)
tmpAlBuffers = make([]al.Buffer, maxBufferNum)
tmpAlBuffers = make([]openal.Buffer, maxBufferNum)
)
func (p *Player) Proceed() error {
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: before proceed: %d", err)
if err := openal.Err(); err != nil {
return fmt.Errorf("driver: starting Proceed: %v", err)
}
processedNum := p.alSource.BuffersProcessed()
if 0 < processedNum {
bufs := tmpAlBuffers[:processedNum]
p.alSource.UnqueueBuffers(bufs...)
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: Unqueue in process: %d", err)
p.alSource.UnqueueBuffers(bufs)
if err := openal.Err(); err != nil {
return fmt.Errorf("driver: UnqueueBuffers: %v", err)
}
p.alBuffers = append(p.alBuffers, bufs...)
}
@ -122,10 +118,10 @@ func (p *Player) Proceed() error {
if 0 < n {
buf := p.alBuffers[0]
p.alBuffers = p.alBuffers[1:]
buf.BufferData(p.alFormat, tmpBuffer[:n], int32(p.sampleRate))
p.alSource.QueueBuffers(buf)
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: Queue in process: %d", err)
buf.SetData(p.alFormat, tmpBuffer[:n], int32(p.sampleRate))
p.alSource.QueueBuffer(buf)
if err := openal.Err(); err != nil {
return fmt.Errorf("driver: QueueBuffer: %v", err)
}
}
if err != nil {
@ -133,11 +129,11 @@ func (p *Player) Proceed() error {
}
}
if p.alSource.State() == al.Stopped || p.alSource.State() == al.Initial {
al.RewindSources(p.alSource)
al.PlaySources(p.alSource)
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: PlaySource in process: %d", err)
if p.alSource.State() == openal.Stopped || p.alSource.State() == openal.Initial {
p.alSource.Rewind()
p.alSource.Play()
if err := openal.Err(); err != nil {
return fmt.Errorf("driver: Rwind or Play: %v", err)
}
}
@ -145,23 +141,24 @@ func (p *Player) Proceed() error {
}
func (p *Player) Close() error {
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: error before closing: %d", err)
if err := openal.Err(); err != nil {
return fmt.Errorf("driver: starting Close: %v", err)
}
if p.isClosed {
return nil
}
var bs []al.Buffer
al.RewindSources(p.alSource)
al.StopSources(p.alSource)
var bs []openal.Buffer
p.alSource.Rewind()
p.alSource.Play()
if n := p.alSource.BuffersQueued(); 0 < n {
bs = make([]al.Buffer, n)
p.alSource.UnqueueBuffers(bs...)
bs = make([]openal.Buffer, n)
p.alSource.UnqueueBuffers(bs)
p.alBuffers = append(p.alBuffers, bs...)
}
p.alDevice.CloseDevice()
p.isClosed = true
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: error after closing: %d", err)
if err := openal.Err(); err != nil {
return fmt.Errorf("driver: CloseDevice: %v", err)
}
runtime.SetFinalizer(p, nil)
return nil