// 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 AddSource(in snd.Sound) error {
switch in.Channels() {
case 1:
hwa.format = al.FormatMono16
case 2:
hwa.format = al.FormatStereo16
default:
return fmt.Errorf("snd/al: can't handle input with channels(%v)", in.Channels())
}
hwa.in = in
hwa.out = make([]byte, in.BufferLen()*2)
s := al.GenSources(1)
if code := al.Error(); code != 0 {
return fmt.Errorf("snd/al: generate source failed [err=%v]", code)
}
hwa.source = s[0]
hwa.buf.src = s[0]
log.Println("snd/al: software latency", SoftLatency())
hwa.inputs = snd.GetInputs(in)
return nil
}
// NewPlayer returns a new Player.
// It initializes the underlying audio devices and the related resources.
// If zero values are provided for format and sample rate values, the player
// determines them from the source's WAV header.
// An error is returned if the format and sample rate can't be determined.
func NewPlayer(src ReadSeekCloser, format Format, samplesPerSecond int64) (*Player, error) {
if err := al.OpenDevice(); err != nil {
return nil, err
}
if err := createContext(); err != nil {
return nil, err
}
s := al.GenSources(1)
if code := al.Error(); code != 0 {
return nil, fmt.Errorf("audio: cannot generate an audio source [err=%x]", code)
}
p := &Player{
t: &track{format: format, src: src, samplesPerSecond: samplesPerSecond},
source: s[0],
}
if err := p.discoverHeader(); err != nil {
return nil, err
}
if p.t.format == 0 {
return nil, errors.New("audio: cannot determine the format")
}
if p.t.samplesPerSecond == 0 {
return nil, errors.New("audio: cannot determine the sample rate")
}
return p, nil
}
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 NewContext(oscillator model.Oscillator) *Context {
if err := al.OpenDevice(); err != nil {
log.Fatal(err)
}
s := al.GenSources(1)
if code := al.Error(); code != 0 {
log.Fatalln("openal error:", code)
}
return &Context{
source: s[0],
queue: []al.Buffer{},
oscillator: oscillator,
}
}
func NewContext(oscilator Oscilator) *Context {
if err := al.OpenDevice(); err != nil {
log.Fatal(err)
}
s := al.GenSources(1)
if code := al.Error(); code != 0 {
log.Fatalln("openal error:", code)
}
//s[0].SetGain(s[0].MaxGain())
//s[0].SetPosition(al.ListenerPosition())
return &Context{
source: s[0],
queue: []al.Buffer{},
oscilator: oscilator,
}
}
// 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
}
