header={
  "recipe_version": "1.5",
  "title": "Extracts audio from video as MP3",
  "description": "Extracts the audio in MP3 encoding",
  "category": "video",
  "chef": "BeatRig",
  "spice": "BQ==:G+Hy36kJcnQQYYavb/JV2Il6eCYr6h4hRJHCF9rRbhX5BcazL6cuTgUMdz0xA50VWA5PmmV0Q7aWkiUtNFtbk991l+t0e8IBXMReMIT1GNjnZZDv7n2YRAo0xcSQbY0ixjG6LLH4wGKnspKAoA/v69iLn6N2IH0XzIZwTGdHSo4=",
  "palette": "Clean Slate",
  "flavour": "V0qYwFMjhE2ntrarDBMj9zSOLKY4DItUwb4cdGJoHMVnLyLghYvDD9zC4irlVaQ/N2JyCQuqY8yok/4DMp8CFtZo9jE99e/dO5Do3z4GYnheDjeV7ASZ64cCzDW9FK4zLZlvLSaU19hoMIQ9v06+3VATwFbKtfe7H20E1oMJVw4=",
  "time": 1670570388,
  "core_version": "0.4.0",
  "magnetron_version": "1.0.138",
  "type": "demo",
  "os": "windows,macOS",
  "functions": "main",
  "dependencies": "ffprobe,ffmpeg",
  "tags": "video,audio,mp3,rip",
  "uuid": "491fec178c6e4ce8b6ef01148e53568a",
  "instructions": "Drop file(s) here"
};

//----------------------------------------------------------------------------
var config = {
    "totalsec": 0,
};

//----------------------------------------------------------------------------
function cmd_callback(cmd_name, cmd_output)
{
    if(cmd_name == "ffmpeg" && cmd_output.length > 0)
    {
        var progress = calculateSeconds(getStringFromTo(cmd_output, "time=", " bitrate"));
        progress = Math.round(progress / config.totalsec * 100);        
        setProgress(progress);
    }

    return {
        "terminate": isCanceled()
    };
}

function getStringFromTo(source, from, to)
{
    var wildcard = "(" + from + ")(.*)(" + to + ")";
    var r = searchRegEx(source, wildcard, "i", 0);
    if (typeof(r[0]) == "string")
        return r[0].substring(from.length, r[0].length - to.length);
    else return "";
}

function calculateSeconds(dur_tc)
{
    var hours = (dur_tc.substring(0, 2));
    var minutes = (dur_tc.substring(3, 3+2));
    var seconds = (dur_tc.substring(6, 6+2));
    if (hours.substring(0, 1) == "0")
        hours = hours.substring(1,2);
    if (minutes.substring(0, 1) == "0")
        minutes = minutes.substring(1,2);
    if (seconds.substring(0, 1) == "0")
        seconds = seconds.substring(1,2);
    hours = parseInt(hours);
    minutes = parseInt(minutes);
    seconds = parseInt(seconds);
    
    totalsec = (hours * 60 * 60) + (minutes * 60) + seconds;
    return totalsec;
}

function getFileProps(infile)
{
    var probeoutput = cmd("ffprobe", [infile]);
    echo(probeoutput);
    var dur_tc = getStringFromTo(probeoutput, "Duration: ", ", s");
    var extension = searchRegEx(probeoutput, "(?:Audio: )(.*?...)", "i", 1)[0];
    
    config.totalsec = calculateSeconds(dur_tc);
    config.fps = parseInt(getStringFromTo(probeoutput, "kb/s, ", " fps"));
    config.extension = extension;
        
    echo("dur:" + config.totalsec);
    echo("extension:" + extension);

    return dur_tc;
}

function setupArgs(infile, cutItt)
{
    var args1 = ["-y", "-i", infile];
    
    if (gvar.demo)
    {
        echo("overlay");
        args1.push("-i");
        args1.push(config.overlay_file);
    }
          
    args1.push("-map");
    args1.push("a");

    args1.push("-q:a");
    args1.push("0");
   
    args1.push(config.outfile);

    return args1;
}

//----------------------------------------------------------------------------
function main()
{
    // check if ffmpeg is installed
    if (fileExists(getAllowedApps("ffmpeg")) == false)
        abort("no ffmpeg installed");    
    if (fileExists(getAllowedApps("ffprobe")) == false)
        abort("no ffprobe installed");    

    setMainMessage("starting");
    setProgress(0);

    var now = getCurrentEpoch(); // secs since 1 jan 1970
    var files = getFiles();    
    
    var numFiles = files.length;
    if (numFiles <= 0)
        abort("drop a file in the list to encode");
    if (gvar.demo && numFiles > 1)
    {
        numFiles = 1;
        dialog(header.title, "demo only supports one file at a time", "w");
    }

    for (i = 0; i < numFiles; i++)
    {
        // base path
        var infile = files[i].path;
        var pathinfo = getPathInfo(infile);
        var filesize = getFileBytes(infile);        

        echo(infile);
        echo("file size:" + bytesToDescription(filesize));        

        setFileIcon(files[i].path, files[i].index, "HourglassHalf");
        setFileIconColor(files[i].path, files[i].index, "FF5299D3");
        setFileStatus(files[i].path, files[i].index, "busy");

        // calc the duration in sec
        getFileProps(infile);
        
        if (config.totalsec <= 0)
            abort("no content found in this file");
        
        var newfilesize = 0;
        {
            setProgress(101);
        
            var userOuputPath = pathinfo.folder + gvar.pss + pathinfo.basename + "-[magnetron.app].mp3";
            userOuputPath = saveFileDialog("Select a output path", userOuputPath, "*.mp3");
            config.outfile = userOuputPath;
            if (config.outfile.length <= 0)
                abort("cancelled");

            var msg = ("busy please wait");
            setMainMessage(msg);
            echo(msg);
                
            var args1 = setupArgs(infile, config.partItt);
            echo(cmd("ffmpeg", args1)); // perform cmd

            newfilesize = getFileBytes(config.outfile);
            echo("new file size:" + bytesToDescription(newfilesize));

            if(isCanceled())
                abort("cancelled");
        }
        if (newfilesize <= 0)
		{
            setFileIcon(files[i].path, files[i].index, "ExclamationTriangle");
            setFileIconColor(files[i].path, files[i].index, "FFb11414");
            setFileStatus(files[i].path, files[i].index, "can't encode this file", "w");
        }
        else
        {
            setFileIcon(files[i].path, files[i].index, "CheckCircleO");
            setFileIconColor(files[i].path, files[i].index, "FF3aac4d");
            setFileStatus(files[i].path, files[i].index, "done");
        }
    }

    var then = getCurrentEpoch(); // secs since 1 jan 1970    
    setMainMessage("done in " + (then - now) + " sec");
    echo(objectToString(config));
    setProgress(100);
}