[FFmpeg-soc] [soc]: r2932 - mxf/mxfenc.c

[zhentan feng]

Hi

2008/7/31 Reimar Döffinger <Reimar.Doeffinger at stud.uni-karlsruhe.de>

> On Wed, Jul 30, 2008 at 06:06:11PM +0200, spyfeng wrote:
> > Author: spyfeng
> > Date: Wed Jul 30 18:06:11 2008
> > New Revision: 2932
> >
> > Log:
> > remove av_random().
> > use simple way to generate random number as uid.
>
> Why does the specification ask for a random number?
> Do the numbers you generate (which, to be precise are not at all random,
> just an obfuscated deterministic sequence) match that reason?
> Do they have to be so obfuscated to match that reason or would something
> simpler do as well, and possibly more reliably (like a constant value or
> and increasing number - note that a constant is a possible output of any
> true random number generator, does the spec have provisions for that
> case or do they just rely on luck like RTSP seems to do)?
>

according to the specs, the goal is generating UUID which defined by ISO
11578.
there are many ways to generate UUID, random UUID is acceptable and is
version 4 of ISO 11578.

Version 4 UUIDs use a scheme relying only on random numbers.
This algorithm sets the version number, as well as two reserved bits. All
other bits are set using a random or pseudorandom data source.
-- 
Best wishes~