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package effects
import "gitee.com/wulalade/hwpack/music/beep"
// Gain amplifies the wrapped Streamer. The output of the wrapped Streamer gets multiplied by
// 1+Gain.
//
// Note that gain is not equivalent to the human perception of volume. Human perception of volume is
// roughly exponential, while gain only amplifies linearly.
type Gain struct {
Streamer beep.Streamer
Gain float64
}
// Stream streams the wrapped Streamer amplified by Gain.
func (g *Gain) Stream(samples [][2]float64) (n int, ok bool) {
n, ok = g.Streamer.Stream(samples)
for i := range samples[:n] {
samples[i][0] *= 1 + g.Gain
samples[i][1] *= 1 + g.Gain
}
return n, ok
}
// Err propagates the wrapped Streamer's errors.
func (g *Gain) Err() error {
return g.Streamer.Err()
}
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