[FFmpeg-cvslog] avutil/random_seed: Improve get_generic_seed() with higher precission clock()

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Thu Dec 22 03:59:03 2016 +0100| [f0862b18c5c7d8439621f0eeaa9d064d72632afe] | committer: Michael Niedermayer

avutil/random_seed: Improve get_generic_seed() with higher precission clock()

Tested-by: Thomas Turner <thomastdt at googlemail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit da73d95bad4736c5e0a6b4b1a811f4dd4525bb4c)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f0862b18c5c7d8439621f0eeaa9d064d72632afe
---

 libavutil/random_seed.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/libavutil/random_seed.c b/libavutil/random_seed.c
index d1ded7b..bb3f7be 100644
--- a/libavutil/random_seed.c
+++ b/libavutil/random_seed.c
@@ -67,6 +67,7 @@ static uint32_t get_generic_seed(void)
     uint8_t tmp[120];
     struct AVSHA *sha = (void*)tmp;
     clock_t last_t  = 0;
+    clock_t last_td = 0;
     static uint64_t i = 0;
     static uint32_t buffer[512] = { 0 };
     unsigned char digest[20];
@@ -86,11 +87,12 @@ static uint32_t get_generic_seed(void)
 
     for (;;) {
         clock_t t = clock();
-
-        if (last_t == t) {
-            buffer[i & 511]++;
+        if (last_t + 2*last_td + 1 >= t) {
+            last_td = t - last_t;
+            buffer[i & 511] = 1664525*buffer[i & 511] + 1013904223 + (last_td % 3294638521U);
         } else {
-            buffer[++i & 511] += (t - last_t) % 3294638521U;
+            last_td = t - last_t;
+            buffer[++i & 511] += last_td % 3294638521U;
             if (last_i && i - last_i > 4 || i - last_i > 64 || TEST && i - last_i > 8)
                 break;
         }