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proactive realignment

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Aiden
2026-05-13 00:28:11 +10:00
parent 5c1fc2a6cf
commit 6a0340d1b4
2 changed files with 24 additions and 0 deletions
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22
apps/LoopThroughWithOpenGLCompositing/videoio/decklink/DeckLinkSession.cpp
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@@ -12,6 +12,9 @@
namespace
{
constexpr int64_t kMinimumHealthyScheduleLeadFrames = 3;
constexpr int64_t kProactiveScheduleLeadFloorFrames = 2;
class SystemMemoryDeckLinkVideoBuffer : public IDeckLinkVideoBuffer
{
public:
@@ -539,6 +542,7 @@ bool DeckLinkSession::ScheduleFrame(IDeckLinkMutableVideoFrame* outputVideoFrame
}
UpdateScheduleLeadTelemetry();
MaybeRealignScheduleCursorForLowLead();
const VideoIOScheduleTime scheduleTime = mScheduler.NextScheduleTime();
const auto scheduleStart = std::chrono::steady_clock::now();
const HRESULT result = output->ScheduleVideoFrame(outputVideoFrame, scheduleTime.streamTime, scheduleTime.duration, scheduleTime.timeScale);
@@ -577,6 +581,24 @@ void DeckLinkSession::UpdateScheduleLeadTelemetry()
mState.deckLinkScheduleLeadFrames = static_cast<int64_t>(nextScheduleFrameIndex) - static_cast<int64_t>(playbackFrameIndex);
}
void DeckLinkSession::MaybeRealignScheduleCursorForLowLead()
{
if (!mState.deckLinkScheduleLeadAvailable)
return;
if (mState.deckLinkScheduleLeadFrames >= kMinimumHealthyScheduleLeadFrames)
{
mProactiveScheduleRealignmentArmed = true;
return;
}
if (!mProactiveScheduleRealignmentArmed || mState.deckLinkScheduleLeadFrames > kProactiveScheduleLeadFloorFrames)
return;
RealignScheduleCursorToPlayback();
mProactiveScheduleRealignmentArmed = false;
}
void DeckLinkSession::RealignScheduleCursorToPlayback()
{
if (output == nullptr)