2.4.9 Timecode/Timecode user bits

The capture and output of VITC and RP188 timecodes are supported on certain DeckLink models. VITC timecodes are only supported with SD video modes. On non-4K DeckLink devices, RP188 timecodes are only supported with HD video modes.

To use this feature please refer to the following points:

2.4.9.1 Timecode Capture

An application performing timecode capture should perform the following steps. For an example of timecode capture please refer to the CapturePreview sample application in the DeckLink SDK.

• For HDMI capture, call IDeckLinkProfileAttributes::GetFlag() using BMDDeckLinkSupportsHDMITimecode to check that the DeckLink hardware supports HDMI timecode.

• IDeckLinkInput::EnableVideoInput()

• IDeckLinkInput::EnableAudioInput()

• IDeckLinkInput::SetCallback()

• IDeckLinkInput::StartStreams()

While streams are running:

• Receive calls to IDeckLinkInputCallback::VideoInputFrameArrived() with video frame and corresponding audio packet.

• Call IDeckLinkVideoInputFrame::GetTimecode()

• IDeckLinkTimecode::GetFlags()

• IDeckLinkTimecode::GetTimecodeUserBits() (User bits are not supported for HDMI timecode).

• IDeckLinkInput::StopStreams()

• IDeckLinkInput::DisableVideoInput()

2.4.9.2 Timecode Output

An application performing timecode output should perform the following steps. For an example of timecode output please refer to the SignalGenerator sample application in the DeckLink SDK.

• For HDMI output, call IDeckLinkProfileAttributes::GetFlag() using BMDDeckLinkSupportsHDMITimecode to check that the DeckLink hardware supports HDMI timecode.

• Call IDeckLinkOutput::EnableVideoOutput() with either bmdVideoOutputVITC or bmdVideoOutputRP188.

• IDeckLinkOutput::EnableAudioOutput()

• IDeckLinkOutput::SetScheduledFrameCompletionCallback()

• IDeckLinkOutput::SetAudioCallback()

• IDeckLinkOutput::BeginAudioPreroll()

While more frames or audio need to be pre-rolled:

• Create video frames with IDeckLinkOutput::CreateVideoFrame() or IDeckLinkOutput::CreateVideoFrameWithBuffer().

• Set the timecode into the frame with IDeckLinkMutableVideoFrame::SetTimecode() or IDeckLinkMutableVideoFrame::SetTimecodeFromComponents().

• IDeckLinkOutput::ScheduleVideoFrame()

• Return audio data from IDeckLinkAudioOutputCallback::RenderAudioSamples(). When audio preroll is complete, call IDeckLinkOutput::EndAudioPreroll().

• IDeckLinkOutput::StartScheduledPlayback()

While playback is running:

• Create video frames and set the timecode.

• Schedule more video frames from IDeckLinkVideoOutputCallback::ScheduledFrameCompleted().

• Schedule more audio from IDeckLinkAudioOutputCallback::RenderAudioSamples().

• IDeckLinkOutput::StopScheduledPlayback()

• IDeckLinkOutput::DisableVideoOutput()