func (c *Context) Play() {
c.Lock()
defer c.Unlock()
n := c.source.BuffersProcessed()
if n > 0 {
rm, split := c.queue[:n], c.queue[n:]
c.queue = split
c.source.UnqueueBuffers(rm...)
al.DeleteBuffers(rm...)
}
for len(c.queue) < QUEUE {
b := al.GenBuffers(1)
buf := make([]byte, NS*CZ)
for n := 0; n < NS*CZ; n += CZ {
v := int16(float32(32767) * c.oscilator())
binary.LittleEndian.PutUint16(buf[n:n+2], uint16(v))
}
b[0].BufferData(Fmt, buf, SampleRate)
c.source.QueueBuffers(b...)
c.queue = append(c.queue, b...)
}
if c.source.State() != al.Playing {
al.PlaySources(c.source)
}
}
func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
var p *Player
if err := al.OpenDevice(); err != nil {
return nil, fmt.Errorf("driver: OpenAL initialization failed: %v", err)
}
s := al.GenSources(1)
if e := al.Error(); e != 0 {
return nil, fmt.Errorf("driver: al.GenSources error: %d", e)
}
p = &Player{
alSource: s[0],
alBuffers: []al.Buffer{},
sampleRate: sampleRate,
alFormat: alFormat(channelNum, bytesPerSample),
}
runtime.SetFinalizer(p, (*Player).Close)
bs := al.GenBuffers(maxBufferNum)
const bufferSize = 1024
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)
return p, nil
}
// PlaySound will play the key's sound if the coordinates lay within the key itself.
func (k *PianoKey) PlaySound(x float32, y float32, frameData util.FrameData) bool {
if !k.pressed && k.DoesCoordsOverlapKey(x, y, frameData) {
k.pressed = true
al.PlaySources(k.soundSources...)
return true
}
return false
}
// Play buffers the source audio to the audio device and starts
// to play the source.
// If the player paused or stopped, it reuses the previously buffered
// resources to keep playing from the time it has paused or stopped.
func (p *Player) Play() error {
if p == nil {
return nil
}
// Prepares if the track hasn't been buffered before.
if err := p.prepare(0, false); err != nil {
return err
}
al.PlaySources(p.source)
return lastErr()
}
func (as *AudioSystem) Update(entity *ecs.Entity, dt float32) {
var ac *AudioComponent
var ok bool
if ac, ok = entity.ComponentFast(ac).(*AudioComponent); !ok {
return
}
if ac.player == nil {
f := Files.Sound(ac.File)
if f == nil {
return
}
var err error
ac.player, err = NewPlayer(f, 0, 0)
if err != nil {
log.Println("Error initializing AudioSystem:", err)
return
}
}
if ac.player.State() != Playing {
if ac.player.State() == Stopped {
if !ac.Repeat {
al.RewindSources(ac.player.source)
al.StopSources(ac.player.source)
entity.RemoveComponent(ac)
return
}
}
// Prepares if the track hasn't been buffered before.
if err := ac.player.prepare(ac.Background, 0, false); err != nil {
log.Println("Error initializing AudioSystem:", err)
return
}
al.PlaySources(ac.player.source)
if !ac.Background {
var space *SpaceComponent
var ok bool
if space, ok = entity.ComponentFast(space).(*SpaceComponent); !ok {
return
}
ac.player.source.SetPosition(al.Vector{
(space.Position.X + space.Width/2) / Width(),
(space.Position.Y + space.Height/2) / Height(),
0})
}
}
}
func (a *AudioSystem) Update(dt float32) {
for _, e := range a.entities {
if e.AudioComponent.player == nil {
f := Files.Sound(e.AudioComponent.File)
if f == nil {
log.Println("Audio file not loaded:", e.AudioComponent.File)
continue
}
var err error
e.AudioComponent.player, err = NewPlayer(f, 0, 0)
if err != nil {
log.Println("Error initializing AudioComponent:", err)
continue
}
}
if MasterVolume != a.cachedVolume {
e.AudioComponent.SetVolume(e.AudioComponent.RawVolume)
}
if e.AudioComponent.player.State() != Playing {
if e.AudioComponent.player.State() == Stopped {
if !e.AudioComponent.Repeat {
al.RewindSources(e.AudioComponent.player.source)
al.StopSources(e.AudioComponent.player.source)
// Remove it from this system, defer because we want to be sure it doesn't interfere with
// looping over a.entities
defer a.Remove(*e.BasicEntity)
continue
}
}
// Prepares if the track hasn't been buffered before.
if err := e.AudioComponent.player.prepare(e.AudioComponent.Background, 0, false); err != nil {
log.Println("Error initializing AudioComponent:", err)
continue
}
al.PlaySources(e.AudioComponent.player.source)
if !e.AudioComponent.Background {
e.AudioComponent.player.source.SetPosition(al.Vector{
(e.SpaceComponent.Position.X + e.SpaceComponent.Width/2) / GameWidth(), // TODO: ensure we're using correct Width/Height()
(e.SpaceComponent.Position.Y + e.SpaceComponent.Height/2) / GameHeight(),
0,
})
}
}
}
}
func (k *PianoKey) Press(f int) {
k.Angle = 3.14 / 16
k.Finger = f
light.Intensities = k.LightColor
bp := k.source.BuffersProcessed()
if bp > 0 {
b := make([]al.Buffer, bp)
k.source.UnqueueBuffers(b...)
}
if k.source.BuffersQueued() == 0 {
k.source.QueueBuffers(k.buffers[0])
al.PlaySources(k.source)
}
}
// Seek moves the play head to the given offset relative to the start of the source.
func (p *Player) Seek(offset time.Duration) error {
if p == nil {
return nil
}
if err := p.Stop(); err != nil {
return err
}
size := durToByteOffset(p.t, offset)
if err := p.prepare(size, true); err != nil {
return err
}
al.PlaySources(p.source)
return lastErr()
}
func (p *Player) Proceed(data []byte) error {
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: before proceed: %d", err)
}
processedNum := p.alSource.BuffersProcessed()
if 0 < processedNum {
bufs := make([]al.Buffer, processedNum)
p.alSource.UnqueueBuffers(bufs...)
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: Unqueue in process: %d", err)
}
p.alBuffers = append(p.alBuffers, bufs...)
}
if len(p.alBuffers) == 0 {
// This can happen (#207)
return nil
}
buf := p.alBuffers[0]
p.alBuffers = p.alBuffers[1:]
buf.BufferData(p.alFormat, data, int32(p.sampleRate))
p.alSource.QueueBuffers(buf)
if err := al.Error(); err != 0 {
return fmt.Errorf("driver: Queue in process: %d", err)
}
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)
}
}
return nil
}
func Tick() {
start := time.Now()
if code := al.DeviceError(); code != 0 {
log.Printf("snd/al: unknown device error [err=%v]\n", code)
}
if code := al.Error(); code != 0 {
log.Printf("snd/al: unknown error [err=%v]\n", code)
}
bufs := hwa.buf.Get()
for _, buf := range bufs {
hwa.tc++
// TODO the general idea here is that GetInputs is rather cheap to call, even with the
// current first-draft implementation, so it could only return inputs that are actually
// turned on. This would introduce software latency determined by snd.DefaultBufferLen
// as turning an input back on would not get picked up until the next iteration.
// if !realtime {
// hwa.inputs = snd.GetInputs(hwa.in)
// }
dp.Dispatch(hwa.tc, hwa.inputs...)
for i, x := range hwa.in.Samples() {
// clip
if x > 1 {
x = 1
} else if x < -1 {
x = -1
}
n := int16(math.MaxInt16 * x)
hwa.out[2*i] = byte(n)
hwa.out[2*i+1] = byte(n >> 8)
}
buf.BufferData(hwa.format, hwa.out, int32(hwa.in.SampleRate()))
if code := al.Error(); code != 0 {
log.Printf("snd/al: buffer data failed [err=%v]\n", code)
}
}
if len(bufs) != 0 {
hwa.source.QueueBuffers(bufs)
}
if code := al.Error(); code != 0 {
log.Printf("snd/al: queue buffer failed [err=%v]\n", code)
}
switch hwa.source.State() {
case al.Initial:
al.PlaySources(hwa.source)
case al.Playing:
case al.Paused:
case al.Stopped:
hwa.underruns++
al.PlaySources(hwa.source)
}
hwa.tdur += time.Now().Sub(start)
}
// PlaySound plays the sound of the source i
func PlaySound(i int) {
al.PlaySources(sources[i])
}
