Record sound: Difference between revisions

=={{header|Go}}==

{{works with|Ubuntu 16.04}}

<br>

As Go does not have any audio support in its standard library, this invokes the 'arecord' command-line utility to record sound from the internal microphone (assuming there's no other audio input device present) and saves it to a monophonic, signed 16-bit .wav file. It then plays it back using the 'aplay' utility.

The file name, sampling rate and duration can all be set by the user.

<lang go>package main

import (

"bufio"

"fmt"

"log"

"os"

"os/exec"

"strconv"

)

func check(err error) {

if err != nil {

log.Fatal(err)

}

}

func main() {

scanner := bufio.NewScanner(os.Stdin)

name := ""

for name == "" {

fmt.Print("Enter output file name (without extension) : ")

scanner.Scan()

name = scanner.Text()

check(scanner.Err())

}

name += ".wav"

rate := 0

for rate < 2000 || rate > 192000 {

fmt.Print("Enter sampling rate in Hz (2000 to 192000) : ")

scanner.Scan()

input := scanner.Text()

check(scanner.Err())

rate, _ = strconv.Atoi(input)

}

rateS := strconv.Itoa(rate)

dur := 0.0

for dur < 5 || dur > 30 {

fmt.Print("Enter duration in seconds (5 to 30) : ")

scanner.Scan()

input := scanner.Text()

check(scanner.Err())

dur, _ = strconv.ParseFloat(input, 64)

}

durS := strconv.FormatFloat(dur, 'f', -1, 64)

fmt.Println("OK, start speaking now...")

// Default arguments: -c 1, -t wav. Note only signed 16 bit format supported.

args := []string{"-r", rateS, "-f", "S16_LE", "-d", durS, name}

cmd := exec.Command("arecord", args...)

err := cmd.Run()

check(err)

fmt.Printf("'%s' created on disk and will now be played back...\n", name)

cmd = exec.Command("aplay", name)

err = cmd.Run()

check(err)

fmt.Println("Play-back completed.")

}</lang>