[FFmpeg-cvslog] avutil/random_seed: Add the runtime in cycles of the main loop to the entropy pool
Michael Niedermayer
git at videolan.org
Thu Apr 28 05:29:18 CEST 2016
ffmpeg | branch: release/2.7 | Michael Niedermayer <michael at niedermayer.cc> | Wed Dec 9 15:18:53 2015 +0100| [91b6d89d0a5ed5ac1aa3ca60d6f8dca93b50d461] | committer: Michael Niedermayer
avutil/random_seed: Add the runtime in cycles of the main loop to the entropy pool
This should theoretically improve the randomness slightly
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 2540d884f3fd7cfac503e048112098967be2569a)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=91b6d89d0a5ed5ac1aa3ca60d6f8dca93b50d461
---
libavutil/random_seed.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavutil/random_seed.c b/libavutil/random_seed.c
index 8aa8c38..5af8e9e 100644
--- a/libavutil/random_seed.c
+++ b/libavutil/random_seed.c
@@ -97,8 +97,13 @@ static uint32_t get_generic_seed(void)
last_t = t;
}
- if(TEST)
+ if(TEST) {
buffer[0] = buffer[1] = 0;
+ } else {
+#ifdef AV_READ_TIME
+ buffer[111] += AV_READ_TIME();
+#endif
+ }
av_sha_init(sha, 160);
av_sha_update(sha, (const uint8_t *)buffer, sizeof(buffer));
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