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Hi,

I am trying to set the header size (ID3v2 tag) for a mp3 file.
The size in descripted as follow:

"The ID3v2 tag size is encoded with four bytes where the most significant bit (bit 7) is set to zero in every byte, making a total of 28 bits. The zeroed bits are ignored, so a 257 bytes long tag is represented as $00 00 02 01.
Only 28 bits (representing up to 256MB) are used in the size description to avoid the introducuction of 'false syncsignals'."

So I am looking for a solution to set a signed integer value in below format.

Thanks a lot for any help to solve that!!


Daniel.
Posted
Updated 21-Nov-10 11:07am
v2

1 solution

Well, I don't have an answer for you but I found two articles that might at least get you started.

1. MP3 Header Reader[^].

2. Read MP3 Tag information[^].

The second one, in particular, has some links that might be useful.
   
Comments
Daniel Leykauf 21-Nov-10 18:02pm
   
Thank you! I found a C# solution and it is working fine in C#. But in VB do I have to truncate the values otherwise do I get for the 3rd byte 4 instead of 3 ... crazy:
Dim Length as Integer = 63040
For i As Integer = 3 To 0 Step -1
b(i) = Convert.ToByte(Length Mod &H80)
Debug.Print(b(i)) Length /= &H80
Length = Math.Truncate(Length / &H80)
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