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[host] app: add throttleFPS option

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arcnmx 2021-07-25 22:25:29 -07:00 committed by Geoffrey McRae
parent 6ed1f4662d
commit 552a37122a
1 changed files with 21 additions and 0 deletions
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21
host/src/app.c
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@ -127,6 +127,13 @@ static struct Option options[] =
.value.x_string = "", .value.x_string = "",
.validator = validateCaptureBackend, .validator = validateCaptureBackend,
}, },
{
.module = "app",
.name = "throttleFPS",
.description = "Throttle Capture Frame Rate",
.type = OPTION_TYPE_INT,
.value.x_int = 0,
},
{0} {0}
}; };
@ -608,6 +615,10 @@ int app_main(int argc, char * argv[])
} }
} }
int throttleFps = option_get_int("app", "throttleFPS");
int throttleUs = throttleFps ? 1000000 / throttleFps : 0;
uint64_t previousFrameTime = 0;
const char * ifaceName = option_get_string("app", "capture"); const char * ifaceName = option_get_string("app", "capture");
CaptureInterface * iface = NULL; CaptureInterface * iface = NULL;
for(int i = 0; CaptureInterfaces[i]; ++i) for(int i = 0; CaptureInterfaces[i]; ++i)
@ -721,6 +732,16 @@ int app_main(int argc, char * argv[])
LG_UNLOCK(app.pointerLock); LG_UNLOCK(app.pointerLock);
} }
const uint64_t now = microtime();
const uint64_t delta = now - previousFrameTime;
if (delta < throttleUs)
{
nsleep((throttleUs - delta) * 1000);
previousFrameTime = microtime();
}
else
previousFrameTime = now;
switch(iface->capture()) switch(iface->capture())
{ {
case CAPTURE_RESULT_OK: case CAPTURE_RESULT_OK: