C#•9mo ago

✅ Editing audio file metadata with TagLib Sharp

Hey there! I'm trying to make a program that streamlines the process of editing file metadata for my music while also giving me a chance to learn something, and I'm running into this problem when I want to set the artist of the track: The way it's stored in TagLib is using a property TagLib.File.Tag.Performers, which is an array of strings. It's initialized to be of length zero, which makes sense, but when I try to set it to a new nonempty array of strings, it just doesn't work, which then leads me to getting an IndexOutOfRangeException when I inevitably want to set the first value in that array. I may be making a very very stupid mistake but nonetheless I thought i'd ask. I don't want to post my code unless someone asks because it's actual programming gore and I know it. Thanks in advance!

8 Replies

canton7•9mo ago

https://github.com/mono/taglib-sharp/blob/c853d26fcf831b9c7bf1b1bc7734c2a8690ca163/src/TaglibSharp/Id3v1/Tag.cs#L331 looks like you can just re-assign it?

GitHub

taglib-sharp/src/TaglibSharp/Id3v1/Tag.cs at c853d26fcf831b9c7bf1b1...

Library for reading and writing metadata in media files - mono/taglib-sharp

BigBoyConstOP•9mo ago

that's what I'm doing

canton7•9mo ago

Can you share your code?

BigBoyConstOP•9mo ago

alright, it's horrible tho haha

Console.Write("Input the path of the file you want to edit: ");

string path = Console.ReadLine() ?? throw new Exception();
path = path.Substring(1, path.Length - 2);
Console.WriteLine("Path: {0}", path);

Console.WriteLine("Current metadata: ");
Console.WriteLine(new string('-', 30));
GetMetadata(path);
Console.WriteLine(new string('-', 30));

ChangeMetadata(path);

Console.WriteLine("New metadata: ");
Console.WriteLine(new string('-', 30));
GetMetadata(path);
Console.WriteLine(new string('-', 30));

static void GetMetadata(string path)
{
    var tFile = TagLib.File.Create(path);
    string title, artist, album, genre;
    uint trackNumber, year;
    title = tFile.Tag.Title;
    artist = tFile.Tag.FirstPerformer;
    album = tFile.Tag.Album;
    trackNumber = tFile.Tag.Track;
    genre = tFile.Tag.FirstGenre;
    year = tFile.Tag.Year;

    foreach (var item in new string[] { title, artist, album, genre, trackNumber.ToString(), year.ToString() })
    {
        Console.WriteLine(string.IsNullOrEmpty(item) ? "none" : item);
    }
}
// Change Artist, Album, Track no., Genre, Title, Year
static void ChangeMetadata(string path)
{
    var tFile = TagLib.File.Create(path);

    string[] uintMessages = { "Insert track no.: ", "Insert year: " };

    Console.Write("Insert song title: ");
    tFile.Tag.Title = Console.ReadLine();

    Console.Write("Insert artist name: ");
    tFile.Tag.Performers = new string[1];
    tFile.Tag.Performers[0] = Console.ReadLine();

    Console.Write("Insert album name: ");
    tFile.Tag.Album = Console.ReadLine();

    Console.Write("Insert genre: ");
    tFile.Tag.Genres = new string[1];
    tFile.Tag.Genres[0] = Console.ReadLine();

    tFile.Tag.Track = ReadUInt(uintMessages[0]);
    
    tFile.Tag.Year = ReadUInt(uintMessages[1]);

    tFile.Save();
}

static uint ReadUInt(string message)
{
    uint val;
    do
        Console.Write(message);
    while (!uint.TryParse(Console.ReadLine(), out val));
    return val;
}

Console.Write("Input the path of the file you want to edit: ");

string path = Console.ReadLine() ?? throw new Exception();
path = path.Substring(1, path.Length - 2);
Console.WriteLine("Path: {0}", path);

Console.WriteLine("Current metadata: ");
Console.WriteLine(new string('-', 30));
GetMetadata(path);
Console.WriteLine(new string('-', 30));

ChangeMetadata(path);

Console.WriteLine("New metadata: ");
Console.WriteLine(new string('-', 30));
GetMetadata(path);
Console.WriteLine(new string('-', 30));

static void GetMetadata(string path)
{
    var tFile = TagLib.File.Create(path);
    string title, artist, album, genre;
    uint trackNumber, year;
    title = tFile.Tag.Title;
    artist = tFile.Tag.FirstPerformer;
    album = tFile.Tag.Album;
    trackNumber = tFile.Tag.Track;
    genre = tFile.Tag.FirstGenre;
    year = tFile.Tag.Year;

    foreach (var item in new string[] { title, artist, album, genre, trackNumber.ToString(), year.ToString() })
    {
        Console.WriteLine(string.IsNullOrEmpty(item) ? "none" : item);
    }
}
// Change Artist, Album, Track no., Genre, Title, Year
static void ChangeMetadata(string path)
{
    var tFile = TagLib.File.Create(path);

    string[] uintMessages = { "Insert track no.: ", "Insert year: " };

    Console.Write("Insert song title: ");
    tFile.Tag.Title = Console.ReadLine();

    Console.Write("Insert artist name: ");
    tFile.Tag.Performers = new string[1];
    tFile.Tag.Performers[0] = Console.ReadLine();

    Console.Write("Insert album name: ");
    tFile.Tag.Album = Console.ReadLine();

    Console.Write("Insert genre: ");
    tFile.Tag.Genres = new string[1];
    tFile.Tag.Genres[0] = Console.ReadLine();

    tFile.Tag.Track = ReadUInt(uintMessages[0]);
    
    tFile.Tag.Year = ReadUInt(uintMessages[1]);

    tFile.Save();
}

static uint ReadUInt(string message)
{
    uint val;
    do
        Console.Write(message);
    while (!uint.TryParse(Console.ReadLine(), out val));
    return val;
}

canton7•9mo ago

Which line throws the exception? Ah, I see

BigBoyConstOP•9mo ago

well it throws at line 50 but the error is actually at line 48

canton7•9mo ago

Mutating the performers array isn't going to work: look at the link I posted. I just does string.Join to turn the array back into a ; - separated string And when it reads it back into an array from the string, it's going to give you an empty array So do .Peformers = new[] { Console.ReadLine() }, or:

var performers = new string[1];
performers[0] = Console.ReadLine();
tFile.Tag.Performers = peformers;

var performers = new string[1];
performers[0] = Console.ReadLine();
tFile.Tag.Performers = peformers;

If you really want to be verbose

BigBoyConstOP•9mo ago

ah i see that makes sense well thanks a lot :D

Gaming

Programming

✅ Editing audio file metadata with TagLib Sharp