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lavfi/perms: add seed option.

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This commit is contained in:
Clément Bœsch
2013-03-26 02:39:55 +01:00
parent e600d0628e
commit 9371467d9d
3 changed files with 18 additions and 4 deletions
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14
libavfilter/f_perms.c
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@@ -34,6 +34,7 @@ enum mode {
typedef struct {
const AVClass *class;
AVLFG lfg;
int64_t random_seed;
enum mode mode;
} PermsContext;
@@ -47,6 +48,7 @@ static const AVOption options[] = {
{ "rw", "set all output frames writable", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RW}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ "toggle", "switch permissions", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_TOGGLE}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ "random", "set permissions randomly", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_RANDOM}, INT_MIN, INT_MAX, FLAGS, "mode" },
{ "seed", "set the seed for the random mode", OFFSET(random_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
{ NULL }
};
@@ -54,9 +56,15 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
{
PermsContext *perms = ctx->priv;
// TODO: add a seed option
if (perms->mode == MODE_RANDOM)
av_lfg_init(&perms->lfg, av_get_random_seed());
if (perms->mode == MODE_RANDOM) {
uint32_t seed;
if (perms->random_seed == -1)
perms->random_seed = av_get_random_seed();
seed = perms->random_seed;
av_log(ctx, AV_LOG_INFO, "random seed: 0x%08x\n", seed);
av_lfg_init(&perms->lfg, seed);
}
return 0;
}