SignalGenerator3DVideoFrame* CSignalGeneratorDlg::CreateBlackFrame ()
{
IDeckLinkMutableVideoFrame* referenceBlack = NULL;
IDeckLinkMutableVideoFrame* scheduleBlack = NULL;
HRESULT hr;
BMDPixelFormat pixelFormat;
int bytesPerPixel;
IDeckLinkVideoConversion* frameConverter = NULL;
SignalGenerator3DVideoFrame* ret = NULL;
pixelFormat = (BMDPixelFormat)m_pixelFormatCombo.GetItemData(m_pixelFormatCombo.GetCurSel());
bytesPerPixel = GetBytesPerPixel(pixelFormat);
hr = m_deckLinkOutput->CreateVideoFrame(m_frameWidth, m_frameHeight, m_frameWidth*bytesPerPixel, pixelFormat, bmdFrameFlagDefault, &scheduleBlack);
if (hr != S_OK)
goto bail;
if (pixelFormat == bmdFormat8BitYUV)
{
FillBlack(scheduleBlack);
}
else
{
hr = m_deckLinkOutput->CreateVideoFrame(m_frameWidth, m_frameHeight, m_frameWidth*2, bmdFormat8BitYUV, bmdFrameFlagDefault, &referenceBlack);
if (hr != S_OK)
goto bail;
FillBlack(referenceBlack);
hr = CoCreateInstance(CLSID_CDeckLinkVideoConversion, NULL, CLSCTX_ALL, IID_IDeckLinkVideoConversion, (void**)&frameConverter);
if (hr != S_OK)
goto bail;
hr = frameConverter->ConvertFrame(referenceBlack, scheduleBlack);
if (hr != S_OK)
goto bail;
}
ret = new SignalGenerator3DVideoFrame(scheduleBlack);
bail:
if (referenceBlack)
referenceBlack->Release();
if (scheduleBlack)
scheduleBlack->Release();
if (frameConverter)
frameConverter->Release();
return ret;
}
void SignalGenerator::startRunning()
{
IDeckLinkDisplayMode* videoDisplayMode = NULL;
BMDVideoOutputFlags videoOutputFlags = 0;
QVariant v;
// Determine the audio and video properties for the output stream
v = ui->outputSignalPopup->itemData(ui->outputSignalPopup->currentIndex());
outputSignal = (OutputSignal)v.value<int>();
v = ui->audioChannelPopup->itemData(ui->audioChannelPopup->currentIndex());
audioChannelCount = v.value<int>();
v = ui->audioSampleDepthPopup->itemData(ui->audioSampleDepthPopup->currentIndex());
audioSampleDepth = v.value<int>();
audioSampleRate = bmdAudioSampleRate48kHz;
//
// - Extract the IDeckLinkDisplayMode from the display mode popup menu (stashed in the item's tag)
v = ui->videoFormatPopup->itemData(ui->videoFormatPopup->currentIndex());
videoDisplayMode = (IDeckLinkDisplayMode *)v.value<void*>();
frameWidth = videoDisplayMode->GetWidth();
frameHeight = videoDisplayMode->GetHeight();
videoDisplayMode->GetFrameRate(&frameDuration, &frameTimescale);
// Calculate the number of frames per second, rounded up to the nearest integer. For example, for NTSC (29.97 FPS), framesPerSecond == 30.
framesPerSecond = (frameTimescale + (frameDuration-1)) / frameDuration;
if (videoDisplayMode->GetDisplayMode() == bmdModeNTSC ||
videoDisplayMode->GetDisplayMode() == bmdModeNTSC2398 ||
videoDisplayMode->GetDisplayMode() == bmdModePAL)
{
timeCodeFormat = bmdTimecodeVITC;
videoOutputFlags |= bmdVideoOutputVITC;
}
else
{
timeCodeFormat = bmdTimecodeRP188Any;
videoOutputFlags |= bmdVideoOutputRP188;
}
if (timeCode)
delete timeCode;
timeCode = new Timecode(framesPerSecond);
// Set the video output mode
if (deckLinkOutput->EnableVideoOutput(videoDisplayMode->GetDisplayMode(), videoOutputFlags) != S_OK)
goto bail;
// Set the audio output mode
if (deckLinkOutput->EnableAudioOutput(bmdAudioSampleRate48kHz, audioSampleDepth, audioChannelCount, bmdAudioOutputStreamTimestamped) != S_OK)
goto bail;
// Generate one second of audio tone
audioSamplesPerFrame = ((audioSampleRate * frameDuration) / frameTimescale);
audioBufferSampleLength = (framesPerSecond * audioSampleRate * frameDuration) / frameTimescale;
audioBuffer = malloc(audioBufferSampleLength * audioChannelCount * (audioSampleDepth / 8));
if (audioBuffer == NULL)
goto bail;
FillSine(audioBuffer, audioBufferSampleLength, audioChannelCount, audioSampleDepth);
// Generate a frame of black
if (deckLinkOutput->CreateVideoFrame(frameWidth, frameHeight, frameWidth*2, bmdFormat8BitYUV, bmdFrameFlagDefault, &videoFrameBlack) != S_OK)
goto bail;
FillBlack(videoFrameBlack);
// Generate a frame of colour bars
if (deckLinkOutput->CreateVideoFrame(frameWidth, frameHeight, frameWidth*2, bmdFormat8BitYUV, bmdFrameFlagDefault, &videoFrameBars) != S_OK)
goto bail;
FillColourBars(videoFrameBars);
// Begin video preroll by scheduling a second of frames in hardware
totalFramesScheduled = 0;
for (unsigned int i = 0; i < framesPerSecond; i++)
scheduleNextFrame(true);
// Begin audio preroll. This will begin calling our audio callback, which will start the DeckLink output stream.
totalAudioSecondsScheduled = 0;
if (deckLinkOutput->BeginAudioPreroll() != S_OK)
goto bail;
// Success; update the UI
running = true;
ui->startButton->setText("Stop");
// Disable the user interface while running (prevent the user from making changes to the output signal)
enableInterface(false);
return;
bail:
QMessageBox::critical(this, "Failed to start output", "Failed to start output");
// *** Error-handling code. Cleanup any resources that were allocated. *** //
stopRunning();
}