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decklink: Don't show incompatible formats

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Changes the formats dropdown for decklink output to only show formats
using the same framerate as OBS does. OBS cannot perform framerate
conversions, meaning that if OBS's framerate is set to 45fps, and
decklink output is set to 60fps, the output will either lag heavily
or simply not function.
This commit is contained in:
tt2468 2021-04-20 22:24:33 -07:00 • committed by Jim
commit 0698eeda94
3 changed files with 43 additions and 4 deletions
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18
plugins/decklink/decklink-device-mode.cpp
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@ -66,6 +66,24 @@ const std::string &DeckLinkDeviceMode::GetName(void) const
return name;
}
bool DeckLinkDeviceMode::IsEqualFrameRate(int64_t num, int64_t den)
{
if (!mode)
return false;
BMDTimeValue timeValue;
BMDTimeScale timeScale;
if (mode->GetFrameRate(&timeValue, &timeScale) != S_OK)
return false;
// Calculate greatest common divisor of both values to properly compare framerates
int decklinkGcd = std::gcd(timeScale, timeValue);
int inputGcd = std::gcd(num, den);
return ((timeScale / decklinkGcd) == (num / inputGcd) &&
(timeValue / decklinkGcd) == (den / inputGcd));
}
void DeckLinkDeviceMode::SetMode(IDeckLinkDisplayMode *mode_)
{
IDeckLinkDisplayMode *old = mode;