[FFmpeg-devel] WinRT API support patch

Jesse Jiang jessejiang0214 at outlook.com
Fri Nov 21 04:51:12 CET 2014

Hi All,
I did some research, rand() is pseudo random. CryptGenRandom is the system-wide seed, but it cannot be used in Windows RT.
I try to use CryptographicBuffer, which is Windows RT API, but there is a problem. This API needs to link Windows.winmd. The Windows.winmd just like a DLL, but it may different from Windows RT and Windows Phone. First, the SDKs are in the different PATH,Second, the files are also different.
It means that developer need to choice platform first, and then compiler for different library.
I hope ffmpeg only depends on support win32 apis and CRT apis.
So is there any way to instead of srand(time(0)); rand(); ? How about c++11 <random> or Mersenne twister Algorithmic
Best regards,Jesse
Date: Fri, 21 Nov 2014 02:49:59 +0100
From: michaelni at gmx.at
To: ffmpeg-devel at ffmpeg.org
Subject: Re: [FFmpeg-devel] WinRT API support patch

On Fri, Nov 21, 2014 at 01:43:29AM +0000, Jesse Jiang wrote:
> Do you mean that we can use rand() instead of CryptGenRandom in ffmpeg?
rand() is completely wrong
its not even doing the correct operation
rand() is pseudo random
the code requires a strong (and non pseudo) random value
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
When you are offended at any man's fault, turn to yourself and study your
own failings. Then you will forget your anger. -- Epictetus

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