Task: Record sound


C++: #include <iostream>
#include <string>
#include <windows.h>
#include <mmsystem.h>

#pragma comment ( lib, "winmm.lib" )
using namespace std;

class recorder
{
public:
    void start()
    {
	paused = rec = false; action = "IDLE";
	while( true )
	{
	    cout << endl << "==" << action << "==" << endl << endl;
	    cout << "1) Record" << endl << "2) Play" << endl << "3) Pause" << endl << "4) Stop" << endl << "5) Quit" << endl;
	    char c; cin >> c;
	    if( c > '0' && c < '6' )
	    {
		switch( c )
		{
		    case '1': record(); break;
		    case '2': play();   break;
		    case '3': pause();  break;
		    case '4': stop();   break;
		    case '5': stop();   return;
		}
	    }
	}
    }
private:
    void record()
    {
	if( mciExecute( "open new type waveaudio alias my_sound") )
	{ 
	    mciExecute( "record my_sound" ); 
	    action = "RECORDING"; rec = true; 
	}
    }
    void play()
    {
	if( paused )
	    mciExecute( "play my_sound" );
	else
	    if( mciExecute( "open tmp.wav alias my_sound" ) )
		mciExecute( "play my_sound" );

	action = "PLAYING";
	paused = false;
    }
    void pause()
    {
	if( rec ) return;
	mciExecute( "pause my_sound" );
	paused = true; action = "PAUSED";
    }
    void stop()
    {
	if( rec )
	{
	    mciExecute( "stop my_sound" );
	    mciExecute( "save my_sound tmp.wav" );
	    mciExecute( "close my_sound" );
	    action = "IDLE"; rec = false;
	}
	else
	{
	    mciExecute( "stop my_sound" );
	    mciExecute( "close my_sound" );
	    action = "IDLE";
	}
    }
    bool mciExecute( string cmd )
    {
	if( mciSendString( cmd.c_str(), NULL, 0, NULL ) )
	{
	    cout << "Can't do this: " << cmd << endl;
	    return false;
	}
	return true;
    }

    bool paused, rec;
    string action;
};

int main( int argc, char* argv[] )
{
    recorder r; r.start();
    return 0;
}



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...")
    
    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.")
}