// Create an array of 'NUM_FRAMES' IDeckLinkMutableVideoFrames
// and fill in each frame with its own colour
bool PlaybackHelper::createFrames()
{
int i;
bool result = false;
//allocate and reset frame array
m_videoFrames = (IDeckLinkMutableVideoFrame **) malloc(NUM_FRAMES * sizeof(IDeckLinkMutableVideoFrame *));
memset(m_videoFrames, 0x0, NUM_FRAMES * sizeof(IDeckLinkMutableVideoFrame *));
// allocate IDeckLink video frames
for(i = 0; i<NUM_FRAMES; i++)
{
if (m_deckLinkOutput->CreateVideoFrame(m_width, m_height, m_width * 2, bmdFormat8BitYUV, bmdFrameFlagDefault, &m_videoFrames[i]) != S_OK)
{
fprintf(stderr, "Could not obtain frame %d\n", (i+1));
goto bail;
}
// fill in frame buffer
fillFrame(i);
}
result = true;
bail:
if (! result)
releaseFrames();
return result;
}
bool PlaybackHelper::setupDeckLinkOutput()
{
bool result = false;
IDeckLinkDisplayModeIterator* displayModeIterator = NULL;
IDeckLinkDisplayMode* deckLinkDisplayMode = NULL;
m_width = -1;
// set callback
m_deckLinkOutput->SetScheduledFrameCompletionCallback(this);
// get frame scale and duration for the video mode
if (m_deckLinkOutput->GetDisplayModeIterator(&displayModeIterator) != S_OK)
goto bail;
while (displayModeIterator->Next(&deckLinkDisplayMode) == S_OK)
{
if (deckLinkDisplayMode->GetDisplayMode() == bmdModeNTSC)
{
m_width = deckLinkDisplayMode->GetWidth();
m_height = deckLinkDisplayMode->GetHeight();
deckLinkDisplayMode->GetFrameRate(&m_frameDuration, &m_timeScale);
deckLinkDisplayMode->Release();
break;
}
deckLinkDisplayMode->Release();
}
displayModeIterator->Release();
if (m_width == -1)
{
fprintf(stderr, "Unable to find requested video mode\n");
goto bail;
}
// enable video output
if (m_deckLinkOutput->EnableVideoOutput(bmdModeNTSC, bmdVideoOutputFlagDefault) != S_OK)
{
fprintf(stderr, "Could not enable video output\n");
goto bail;
}
// create coloured frames
if (! createFrames())
goto bail;
result = true;
bail:
if (! result)
{
// release coloured frames
releaseFrames();
}
return result;
}
void PlaybackHelper::cleanupDeckLinkOutput()
{
m_deckLinkOutput->StopScheduledPlayback(0, NULL, 0);
m_deckLinkOutput->DisableVideoOutput();
m_deckLinkOutput->SetScheduledFrameCompletionCallback(NULL);
releaseFrames();
}
void VideoAnalyzer::release() {
releaseFrameCallback();
releaseAnalyzerCallback();
releaseFrames();
releaseVideoCapture();
}
