mirror of https://github.com/miguelmota/cointop
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
package beep
|
|
|
|
// Silence returns a Streamer which streams num samples of silence. If num is negative, silence is
|
|
// streamed forever.
|
|
func Silence(num int) Streamer {
|
|
return StreamerFunc(func(samples [][2]float64) (n int, ok bool) {
|
|
if num == 0 {
|
|
return 0, false
|
|
}
|
|
if 0 < num && num < len(samples) {
|
|
samples = samples[:num]
|
|
}
|
|
for i := range samples {
|
|
samples[i] = [2]float64{}
|
|
}
|
|
if num > 0 {
|
|
num -= len(samples)
|
|
}
|
|
return len(samples), true
|
|
})
|
|
}
|
|
|
|
// Callback returns a Streamer, which does not stream any samples, but instead calls f the first
|
|
// time its Stream method is called.
|
|
func Callback(f func()) Streamer {
|
|
return StreamerFunc(func(samples [][2]float64) (n int, ok bool) {
|
|
if f != nil {
|
|
f()
|
|
f = nil
|
|
}
|
|
return 0, false
|
|
})
|
|
}
|
|
|
|
// Iterate returns a Streamer which successively streams Streamers obtains by calling the provided g
|
|
// function. The streaming stops when g returns nil.
|
|
//
|
|
// Iterate does not propagate errors from the generated Streamers.
|
|
func Iterate(g func() Streamer) Streamer {
|
|
var (
|
|
s Streamer
|
|
first = true
|
|
)
|
|
return StreamerFunc(func(samples [][2]float64) (n int, ok bool) {
|
|
if first {
|
|
s = g()
|
|
first = false
|
|
}
|
|
if s == nil {
|
|
return 0, false
|
|
}
|
|
for len(samples) > 0 {
|
|
if s == nil {
|
|
break
|
|
}
|
|
sn, sok := s.Stream(samples)
|
|
if !sok {
|
|
s = g()
|
|
}
|
|
samples = samples[sn:]
|
|
n += sn
|
|
}
|
|
return n, true
|
|
})
|
|
}
|