[MPlayer-cvslog] CVS: main/libmpdemux demux_mpg.c,1.79,1.80

Nico Sabbi nsabbi at email.it
Thu May 4 09:42:09 CEST 2006

Rich Felker wrote:

>On Wed, May 03, 2006 at 07:55:05PM +0200, Nico Sabbi CVS wrote:
>>Log Message:
>>in read_mpeg_timestamp() cast c to uint64_t or before << 30 will set a 1 in the sign bit with bad consequences
>The fix is correct but the log message is NOT correct. The problem is
>much bigger, you are truncating bits because you're shifting them out
>the left! If x is type int, then x<<30 has only 4 possible values: 0,
>0x40000000, 0x80000000, 0xc0000000. The upper bits are _lost_. They do
>not become part of a new 64bit value unless you cast x to a 64bit type
>before the shift.

I'll fix it with cvs admin -m when I'm back home
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