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| author | Michael Niedermayer <michael@niedermayer.cc> | 2016-12-29 00:34:57 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-12-31 17:20:06 +0100 |
| commit | 7525517593dff427021c893a1b21333510b7803b (patch) | |
| tree | 1160e2271ea12ba285123094c2bf1cc494ca6c25 | |
| parent | 5dbce5120b4e05dd6d784e7ed9921c1f276acea3 (diff) | |
| download | ffmpeg-7525517593dff427021c893a1b21333510b7803b.tar.gz | |
libavutil/random_seed: Ensure that get_generic_seed() spends at least 1/32 sec gathering entropy
This may fix the failures on windows
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavutil/random_seed.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/libavutil/random_seed.c b/libavutil/random_seed.c index 0c58c8ffa1..d1c9a3f704 100644 --- a/libavutil/random_seed.c +++ b/libavutil/random_seed.c @@ -68,6 +68,7 @@ static uint32_t get_generic_seed(void) struct AVSHA *sha = (void*)tmp; clock_t last_t = 0; clock_t last_td = 0; + clock_t init_t = 0; static uint64_t i = 0; static uint32_t buffer[512] = { 0 }; unsigned char digest[20]; @@ -93,10 +94,13 @@ static uint32_t get_generic_seed(void) } else { 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; + if ((t - init_t) >= CLOCKS_PER_SEC>>5) + if (last_i && i - last_i > 4 || i - last_i > 64 || TEST && i - last_i > 8) + break; } last_t = t; + if (!init_t) + init_t = t; } if(TEST) { |