tags framesize endless loop

[troisiemetype]

I've run into a problem while parsing tags in mp3 files with embedded images (APIC frames), with my program freezing.
It appears that the for loop which populate the value buffer has an int16_t as a counter, thus overflowing when frame size is above 65535 bytes. I've changed it to an int32_t.

Besides, I needed some other tags to be extracted for my projects, I've thus added the following ones :
TRCK / TRKtrack number (+ total tracks)
TPOS / TPA part of a set (+ total set) i.e. if the album has several discs.
POPM / POP popularimeter, aka rating.
TCMP "part of a compilation". It's not clear if this one is an off-standard added by iTunes, or if it's included in ID3v4

[troisiemetype]

Oh, I've forgot to save the file before commiting (git can sometimes be confusing for me !)
I was looking for a way to just parse tags without hanging it over to the player afterwards, and I've used the callback to do so, by transmitting an "end of file" tag.
Thus the cb.md("eof", false, "id3"); that has been inserted in to places in AudioFileSourceID3::read

That was not my intent to push this one.

[earlephilhower]

Thanks, LGTM!