func Main(ctx sound.Context, channels ...chan float64) {
flag.Parse()
runtime.GOMAXPROCS(NumThreads)
// Make a copy of the argument array before we modify it.
channels2 := make([]chan float64, len(channels))
copy(channels2, channels)
channels = channels2
// Measure the duration of the first channel
var durationStream chan float64
channels[0], durationStream = ctx.Fork2(channels[0])
durationChan := make(chan time.Duration, 1)
go func() {
durationChan <- ctx.Duration(durationStream)
}()
so := getOutput(ctx)
// Write the output
startTime := time.Now()
err := so.Write(ctx.SampleRate, channels)
endTime := time.Now()
if err != nil {
fmt.Printf("Error: %s\n", err.Error())
}
outSecs := float64(<-durationChan) / float64(time.Second)
realSecs := float64(endTime.Sub(startTime)) / float64(time.Second)
fmt.Printf("Generated %.3f seconds of audio in %.3f seconds (ratio %.3f).\n", outSecs, realSecs, outSecs/realSecs)
}