quartz: Detect and skip id3v2 header in mpeg splitter

[Chris Robinson]

On Thursday 13 March 2008 09:01:53 pm Maarten Lankhorst wrote:
> If read from a file source, ID3 v2 tags might be incorrectly parsed by
> the head_check. This patch skips the whole tag altogether.

I'm not sure this is completely correct. The main splitter function detects 
the presense of an MP3 header at the start of a sample it's sending to set 
the sample's sync point attribute. Since the ID3 tag is not a sync point, 
this causes the first sample to not be set as a sync point, and it would be 
unlikely that a following sample would, under normal circumstances, contain 
an MP3 header at the start either. This could cause sensitive codecs to never 
find a sync point.

ACMWrapper wouldn't be affected as it doesn't handle sync points, but other 
native codecs (which do work in Wine) could. Additionally, winemp3.acm may be 
affected by the ID3 tag as it doesn't seem to have code to handle it either.