68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
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package beep
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// Silence returns a Streamer which streams num samples of silence. If num is negative, silence is
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// streamed forever.
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//
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// Deprecated: beep.Silence has been moved to generators.Silence
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func Silence(num int) Streamer {
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return StreamerFunc(func(samples [][2]float64) (n int, ok bool) {
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if num == 0 {
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return 0, false
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}
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if 0 < num && num < len(samples) {
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samples = samples[:num]
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}
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for i := range samples {
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samples[i] = [2]float64{}
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}
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if num > 0 {
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num -= len(samples)
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}
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return len(samples), true
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})
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}
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// Callback returns a Streamer, which does not stream any samples, but instead calls f the first
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// time its Stream method is called. The speaker is locked while f is called.
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func Callback(f func()) Streamer {
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return StreamerFunc(func(samples [][2]float64) (n int, ok bool) {
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if f != nil {
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f()
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f = nil
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}
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return 0, false
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})
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}
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// Iterate returns a Streamer which successively streams Streamers obtains by calling the provided g
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// function. The streaming stops when g returns nil.
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//
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// Iterate does not propagate errors from the generated Streamers.
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func Iterate(g func() Streamer) Streamer {
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var (
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s Streamer
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first = true
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)
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return StreamerFunc(func(samples [][2]float64) (n int, ok bool) {
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if first {
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s = g()
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first = false
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}
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if s == nil {
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return 0, false
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}
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for len(samples) > 0 {
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if s == nil {
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break
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}
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sn, sok := s.Stream(samples)
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if !sok {
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s = g()
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}
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samples = samples[sn:]
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n += sn
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}
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return n, true
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})
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}
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