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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 namespace
{ {
constexpr int64_t kMinimumHealthyScheduleLeadFrames = 3;
constexpr int64_t kProactiveScheduleLeadFloorFrames = 2;
class SystemMemoryDeckLinkVideoBuffer : public IDeckLinkVideoBuffer class SystemMemoryDeckLinkVideoBuffer : public IDeckLinkVideoBuffer
{ {
public: public:
@@ -539,6 +542,7 @@ bool DeckLinkSession::ScheduleFrame(IDeckLinkMutableVideoFrame* outputVideoFrame
} }
UpdateScheduleLeadTelemetry(); UpdateScheduleLeadTelemetry();
MaybeRealignScheduleCursorForLowLead();
const VideoIOScheduleTime scheduleTime = mScheduler.NextScheduleTime(); const VideoIOScheduleTime scheduleTime = mScheduler.NextScheduleTime();
const auto scheduleStart = std::chrono::steady_clock::now(); const auto scheduleStart = std::chrono::steady_clock::now();
const HRESULT result = output->ScheduleVideoFrame(outputVideoFrame, scheduleTime.streamTime, scheduleTime.duration, scheduleTime.timeScale); 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); 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() void DeckLinkSession::RealignScheduleCursorToPlayback()
{ {
if (output == nullptr) if (output == nullptr)

2
apps/LoopThroughWithOpenGLCompositing/videoio/decklink/DeckLinkSession.h
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@@ -76,6 +76,7 @@ private:
bool PopulateOutputFrame(IDeckLinkMutableVideoFrame* outputVideoFrame, VideoIOOutputFrame& frame); bool PopulateOutputFrame(IDeckLinkMutableVideoFrame* outputVideoFrame, VideoIOOutputFrame& frame);
bool ScheduleFrame(IDeckLinkMutableVideoFrame* outputVideoFrame); bool ScheduleFrame(IDeckLinkMutableVideoFrame* outputVideoFrame);
void UpdateScheduleLeadTelemetry(); void UpdateScheduleLeadTelemetry();
void MaybeRealignScheduleCursorForLowLead();
void RealignScheduleCursorToPlayback(); void RealignScheduleCursorToPlayback();
bool ScheduleSystemMemoryFrame(const VideoIOOutputFrame& frame); bool ScheduleSystemMemoryFrame(const VideoIOOutputFrame& frame);
bool ScheduleBlackFrame(IDeckLinkMutableVideoFrame* outputVideoFrame); bool ScheduleBlackFrame(IDeckLinkMutableVideoFrame* outputVideoFrame);
@@ -95,6 +96,7 @@ private:
VideoPlayoutScheduler mScheduler; VideoPlayoutScheduler mScheduler;
bool mScheduleRealignmentPending = false; bool mScheduleRealignmentPending = false;
bool mScheduleRealignmentArmed = true; bool mScheduleRealignmentArmed = true;
bool mProactiveScheduleRealignmentArmed = true;
InputFrameCallback mInputFrameCallback; InputFrameCallback mInputFrameCallback;
OutputFrameCallback mOutputFrameCallback; OutputFrameCallback mOutputFrameCallback;
}; };