CODEWITHSUNDEEP
c#wpfaudiofile-ioencoding
SeBee
SeBee

Reputation: 89

WPF C#, Get informations from audio file

Hy!
I'd like to get some informations from an audio file (title, artist, etc.) in C# (wpf). The MediaElement doesn't provides this option, so I used this code (read bytes directly):

public string[] GetAudioFileInfo(string path)
    {
        path = Uri.UnescapeDataString(path);

        byte[] b = new byte[128];
        string[] infos = new string[5]; //Title; Singer; Album; Year; Comm;
        bool isSet = false;

        //Read bytes
        try
        {
            FileStream fs = new FileStream(path, FileMode.Open);
            fs.Seek(-128, SeekOrigin.End);
            fs.Read(b, 0, 128);
            //Set flag
            String sFlag = System.Text.Encoding.Default.GetString(b, 0, 3);
            if (sFlag.CompareTo("TAG") == 0) isSet = true;

            if (isSet)
            {
                infos[0] = System.Text.Encoding.Default.GetString(b, 3, 30); //Title
                infos[1] = System.Text.Encoding.Default.GetString(b, 33, 30); //Singer
                infos[2] = System.Text.Encoding.Default.GetString(b, 63, 30); //Album
                infos[3] = System.Text.Encoding.Default.GetString(b, 93, 4); //Year
                infos[4] = System.Text.Encoding.Default.GetString(b, 97, 30); //Comm
            }
            fs.Close();
            fs.Dispose();
        }
        catch (IOException ex)
        {
            MessageBox.Show(ex.Message);
        }

        return infos;
    }

The problem with this code, that sometimes it doesn't gives the full title or represents only little cubes. (If I open the media in MeidaPlayer, than I can see the full title)
I'm not sure the parameters of the GetString(byte[],int,int), maybe I make mistakes there.

In my prgram: This is the result
In media player: enter image description here

Upvotes: 3

Views: 2611

Answers (1)

CodeNaked
CodeNaked

Reputation: 41403

You are reading the ID3v1 header, which limits the title to 30 characters. In addition, anything shorter than that is padded with spaces or zeros, the latter of which translates into the boxes you see. You'd need to strip those off using something like:

myString = myString.Replace("\0", "")

Chances are the media player is reading the ID3v1 extended tag, which is placed before the header you are reading. See the link above for more information. But it's effectively the 227 bytes before the 128 bytes you are reading.

In the extended header, the title (and others) is limited to 60 characters, instead of 30.

Upvotes: 2

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