MrSinatra;653235 Wrote: > so the first Q is, how does an app decide which frames it will support > such characters?
I would guess necessity, customer demand, and a little common sense. A track can have two or more artists but not two track numbers, titles or album names. > the second Q is, does a standard for this exist anywhere, or is it just > an ad-hoc invention? Mostly ad-hoc. But standards do emerge from common usage, such as that for using TCMP, based on how iTunes uses it. > would a files tag actually have MORE than one frame called TPE1? so > like this: > > TPE1=Paul Simon > TPE1=Art Garfunkel > > is it actually stored in the file that way? meaning, is TPE1 there > twice, or is there only one TPE1 frame thats been hacked somehow? > how many multiple frames can there be? No. There can be only one frame with a given name. Id3v2.4 frames use a null character separator. I believe that technically, it was only introduced in id3v2.4, but Mp3tag also does the same thing with id3v2.3 tags. >From http://www.id3.org/id3v2.4.0-frames Code: -------------------- 4.2. Text information frames The text information frames are often the most important frames, containing information like artist, album and more. There may only be one text information frame of its kind in an tag. All text information frames supports multiple strings, stored as a null separated list, where null is reperesented by the termination code for the charater encoding. All text frame identifiers begin with "T". Only text frame identifiers begin with "T", with the exception of the "TXXX" frame. All the text information frames have the following format: <Header for 'Text information frame', ID: "T000" - "TZZZ", excluding "TXXX" described in 4.2.6.> Text encoding $xx Information <text string(s) according to encoding> -------------------- > and how do you do it in mp3tag? do you do two // characters to inject > multiple frames, (where // acts as a separator?) how do you know if a > file has multiple frames? can u tell in grid view? can any frame be > made into multiple frames? In Mp3tag it's \\. This is just a convention that Mp3tag uses. It appears in both the Tag Panel and in the grid view. In the Extended Tags dialog it always appears as separate fields when there are separate values (id3) or fields (Vorbis comments, APE tags). It is possible to have \\ as a character sequence within a field, so it's far from a perfect user interface. If you have the character sequence \\ in a field then you save the file, Mp3tag will split the field (which means putting in the null byte separator). I played with it just now and it only does this when you save individual files, not when you save multiple files, so it's a little quirky. -- JJZolx ------------------------------------------------------------------------ JJZolx's Profile: http://forums.slimdevices.com/member.php?userid=10 View this thread: http://forums.slimdevices.com/showthread.php?t=89940 _______________________________________________ ripping mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/ripping
