// InitializeSound Initializes sound
func InitializeSound(numKeys int) {
var i float64
data = []byte{}
for i = 0; i < 100000; i = i + 8 {
data = append(data, byte(128+127*math.Sin(i)))
}
err := al.OpenDevice()
if err != nil {
fmt.Println(err)
}
sources = al.GenSources(numKeys)
buffers = al.GenBuffers(numKeys)
secSources = al.GenSources(numKeys)
secBuffers = al.GenBuffers(numKeys)
for j := 0; j < numKeys; j++ {
buffers[j].BufferData(al.FormatMono8, data, int32(100*(numKeys-j)))
secBuffers[j].BufferData(al.FormatMono8, data, 2*int32(100*(numKeys-j)))
sources[j].QueueBuffers(buffers[j : j+1]...)
secSources[j].QueueBuffers(buffers[j : j+1]...)
}
}
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
}
// newPianoKey creates a PianoKey with color and sound.
func newPianoKey(glctx gl.Context, keyColor util.RGBColor, note util.KeyNote) *PianoKey {
key := new(PianoKey)
key.keyColor = keyColor
// Create buffer
key.glBuf = glctx.CreateBuffer()
glctx.BindBuffer(gl.ARRAY_BUFFER, key.glBuf)
// Generate sound
_ = al.OpenDevice()
key.soundBuffers = al.GenBuffers(1)
key.soundSources = al.GenSources(1)
key.soundBuffers[0].BufferData(al.FormatStereo8, audio.GenSound(note), audio.SampleRate)
key.soundSources[0].QueueBuffers(key.soundBuffers)
return key
}
func (p *Player) prepare(offset int64, force bool) error {
p.mu.Lock()
if !force && p.prep {
p.mu.Unlock()
return nil
}
p.mu.Unlock()
if p.t.hasHeader {
offset += headerSize
}
if _, err := p.t.src.Seek(offset, 0); err != nil {
return err
}
var bufs []al.Buffer
// TODO(jbd): Limit the number of buffers in use, unqueue and reuse
// the existing buffers as buffers are processed.
buf := make([]byte, 128*1024)
size := offset
for {
n, err := p.t.src.Read(buf)
if n > 0 {
size += int64(n)
b := al.GenBuffers(1)
b[0].BufferData(formatCodes[p.t.format], buf[:n], int32(p.t.samplesPerSecond))
bufs = append(bufs, b[0])
}
if err == io.EOF {
break
}
if err != nil {
return err
}
}
p.mu.Lock()
if len(p.bufs) > 0 {
p.source.UnqueueBuffers(p.bufs...)
al.DeleteBuffers(p.bufs...)
}
p.sizeBytes = size
p.bufs = bufs
p.prep = true
if len(bufs) > 0 {
p.source.QueueBuffers(bufs...)
}
p.mu.Unlock()
return nil
}
// NewPianoKey returns a key for our piano.
func NewPianoKey(pos mgl32.Vec3, lightColor mgl32.Vec3, white bool, freq float32) PianoKey {
var color mgl32.Vec4
var keySize float32
if white {
color = mgl32.Vec4{0.98, 0.97, 0.94}
keySize = 2
} else {
color = mgl32.Vec4{0.1, 0.1, 0.1, 1.0}
keySize = 1
}
pk := PianoKey{Pos: pos, Angle: 0, Color: color, Frequency: freq, Finger: -1, white: white, LightColor: lightColor}
pk.BBox[0] = pos.Sub(mgl32.Vec3{0.5, 0.6, keySize})
pk.BBox[1] = pos.Add(mgl32.Vec3{0.5, 0.6, keySize})
pk.source = al.GenSources(1)[0]
pk.source.SetGain(1.0)
pk.source.SetPosition(al.Vector{pos.X(), pos.Y(), pos.Z()})
pk.source.SetVelocity(al.Vector{})
pk.buffers = al.GenBuffers(3)
var samples [1024 * 16]int16
sampleRate := 44100
amplitude := float32(0.8 * 0x7FFF)
for i := 0; i < len(samples); i++ {
val := f32.Sin((2.0 * math.Pi * freq) / float32(sampleRate) * float32(i))
samples[i] = int16(amplitude * val)
}
buf := &bytes.Buffer{}
binary.Write(buf, binary.LittleEndian, &samples)
pk.buffers[0].BufferData(al.FormatMono16, buf.Bytes(), 44100)
f, _ := os.Create("audio.raw")
binary.Write(f, binary.LittleEndian, &samples)
f.Close()
return pk
}
// Get returns a slice of buffers of length b.size ready to receive data and be queued.
// If b.src reports processing at-least as many buffers as b.size, buffers up to b.size
// will be unqueued for reuse. Otherwise, new buffers will be generated.
//
// If the length of b.bufs has grown to be greater than maxbufs, a nil slice is returned.
func (b *Buffer) Get() (bufs []al.Buffer) {
if proc := int(b.src.BuffersProcessed()); proc >= b.size {
// advance by size, BuffersProcessed will report that many less next time.
bufs = b.bufs[b.idx : b.idx+b.size]
b.src.UnqueueBuffers(bufs)
if code := al.Error(); code != 0 {
log.Printf("snd/al: unqueue buffers failed [err=%v]\n", code)
}
b.idx = (b.idx + b.size) % len(b.bufs)
} else if len(b.bufs) >= maxbufs {
// likely programmer error, something has gone horribly wrong.
log.Printf("snd/al: get buffers failed, maxbufs reached [len=%v]\n", len(b.bufs))
return nil
} else {
// make more buffers to fill data regardless of what openal says about processed.
bufs = al.GenBuffers(b.size)
if code := al.Error(); code != 0 {
log.Printf("snd/al: generate buffers failed [err=%v]\n", code)
}
b.bufs = append(b.bufs, bufs...)
}
return bufs
}
func (p *Player) prepare(background bool, offset int64, force bool) error {
p.mu.Lock()
if !force && p.prep {
p.mu.Unlock()
return nil
}
p.mu.Unlock()
if p.t.hasHeader {
offset += headerSize
}
if _, err := p.t.src.Seek(offset, 0); err != nil {
return err
}
var bufs []al.Buffer
// TODO(jbd): Limit the number of buffers in use, unqueue and reuse
// the existing buffers as buffers are processed.
buf := make([]byte, 128*1024)
size := offset
for {
n, err := p.t.src.Read(buf)
if n > 0 {
size += int64(n)
b := al.GenBuffers(1)
if !background && p.t.format == Stereo16 {
inputBuffer := bytes.NewBuffer(buf)
outputBuffer := new(bytes.Buffer)
var left, right int16
// TODO: this might not be the best way to convert Stereo16 to Mono16, but it's something
for converted := 0; converted < n; converted += 4 {
binary.Read(inputBuffer, binary.LittleEndian, &left)
binary.Read(inputBuffer, binary.LittleEndian, &right)
binary.Write(outputBuffer, binary.LittleEndian, int16((int32(left)+int32(right))/2))
}
b[0].BufferData(formatCodes[Mono16], outputBuffer.Bytes(), int32(p.t.samplesPerSecond/2))
} else {
b[0].BufferData(formatCodes[p.t.format], buf[:n], int32(p.t.samplesPerSecond))
}
bufs = append(bufs, b[0])
}
if err == io.EOF {
break
}
if err != nil {
return err
}
}
p.mu.Lock()
if len(p.bufs) > 0 {
p.source.UnqueueBuffers(p.bufs...)
al.DeleteBuffers(p.bufs...)
}
p.sizeBytes = size
p.bufs = bufs
p.prep = true
if len(bufs) > 0 {
p.source.QueueBuffers(bufs...)
}
p.mu.Unlock()
return nil
}