429 lines
13 KiB
C++
429 lines
13 KiB
C++
#include "DeckLinkSession.h"
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#include "DeckLinkDisplayMode.h"
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#include "GlRenderConstants.h"
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#include <atlbase.h>
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#include <cstdio>
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#include <cstring>
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#include <new>
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#include <vector>
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namespace
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{
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std::string BstrToUtf8(BSTR value)
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{
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if (value == nullptr)
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return std::string();
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const int requiredBytes = WideCharToMultiByte(CP_UTF8, 0, value, -1, NULL, 0, NULL, NULL);
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if (requiredBytes <= 1)
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return std::string();
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std::vector<char> utf8Name(static_cast<std::size_t>(requiredBytes), '\0');
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if (WideCharToMultiByte(CP_UTF8, 0, value, -1, utf8Name.data(), requiredBytes, NULL, NULL) <= 0)
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return std::string();
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return std::string(utf8Name.data());
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}
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}
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DeckLinkSession::~DeckLinkSession()
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{
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ReleaseResources();
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}
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void DeckLinkSession::ReleaseResources()
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{
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if (input != nullptr)
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input->SetCallback(nullptr);
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captureDelegate.Release();
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input.Release();
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if (output != nullptr)
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output->SetScheduledFrameCompletionCallback(nullptr);
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if (keyer != nullptr)
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{
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keyer->Disable();
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externalKeyingActive = false;
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}
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keyer.Release();
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playoutDelegate.Release();
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outputVideoFrameQueue.clear();
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output.Release();
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playoutAllocator.Release();
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}
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bool DeckLinkSession::DiscoverDevicesAndModes(BMDDisplayMode inputDisplayMode, BMDDisplayMode outputDisplayMode, const std::string& requestedInputDisplayModeName, const std::string& requestedOutputDisplayModeName, std::string& error)
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{
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CComPtr<IDeckLinkIterator> deckLinkIterator;
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CComPtr<IDeckLinkDisplayMode> inputMode;
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CComPtr<IDeckLinkDisplayMode> outputMode;
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inputDisplayModeName = requestedInputDisplayModeName;
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outputDisplayModeName = requestedOutputDisplayModeName;
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HRESULT result = CoCreateInstance(CLSID_CDeckLinkIterator, nullptr, CLSCTX_ALL, IID_IDeckLinkIterator, reinterpret_cast<void**>(&deckLinkIterator));
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if (FAILED(result))
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{
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error = "Please install the Blackmagic DeckLink drivers to use the features of this application.";
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return false;
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}
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CComPtr<IDeckLink> deckLink;
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while (deckLinkIterator->Next(&deckLink) == S_OK)
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{
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int64_t duplexMode;
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bool deviceSupportsInternalKeying = false;
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bool deviceSupportsExternalKeying = false;
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std::string modelName;
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CComPtr<IDeckLinkProfileAttributes> deckLinkAttributes;
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if (deckLink->QueryInterface(IID_IDeckLinkProfileAttributes, (void**)&deckLinkAttributes) != S_OK)
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{
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printf("Could not obtain the IDeckLinkProfileAttributes interface\n");
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deckLink.Release();
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continue;
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}
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result = deckLinkAttributes->GetInt(BMDDeckLinkDuplex, &duplexMode);
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BOOL attributeFlag = FALSE;
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if (deckLinkAttributes->GetFlag(BMDDeckLinkSupportsInternalKeying, &attributeFlag) == S_OK)
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deviceSupportsInternalKeying = (attributeFlag != FALSE);
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attributeFlag = FALSE;
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if (deckLinkAttributes->GetFlag(BMDDeckLinkSupportsExternalKeying, &attributeFlag) == S_OK)
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deviceSupportsExternalKeying = (attributeFlag != FALSE);
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CComBSTR modelNameBstr;
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if (deckLinkAttributes->GetString(BMDDeckLinkModelName, &modelNameBstr) == S_OK)
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modelName = BstrToUtf8(modelNameBstr);
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if (result != S_OK || duplexMode == bmdDuplexInactive)
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{
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deckLink.Release();
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continue;
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}
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bool inputUsed = false;
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if (!input && deckLink->QueryInterface(IID_IDeckLinkInput, (void**)&input) == S_OK)
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inputUsed = true;
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if (!output && (!inputUsed || (duplexMode == bmdDuplexFull)))
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{
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if (deckLink->QueryInterface(IID_IDeckLinkOutput, (void**)&output) != S_OK)
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output.Release();
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else
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{
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outputModelName = modelName;
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supportsInternalKeying = deviceSupportsInternalKeying;
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supportsExternalKeying = deviceSupportsExternalKeying;
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}
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}
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deckLink.Release();
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if (output && input)
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break;
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}
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if (!output)
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{
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error = "Expected an Output DeckLink device";
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ReleaseResources();
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return false;
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}
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CComPtr<IDeckLinkDisplayModeIterator> inputDisplayModeIterator;
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if (input && input->GetDisplayModeIterator(&inputDisplayModeIterator) != S_OK)
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{
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error = "Cannot get input Display Mode Iterator.";
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ReleaseResources();
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return false;
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}
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if (input && !FindDeckLinkDisplayMode(inputDisplayModeIterator, inputDisplayMode, &inputMode))
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{
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error = "Cannot get specified input BMDDisplayMode for configured mode: " + requestedInputDisplayModeName;
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ReleaseResources();
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return false;
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}
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inputDisplayModeIterator.Release();
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CComPtr<IDeckLinkDisplayModeIterator> outputDisplayModeIterator;
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if (output->GetDisplayModeIterator(&outputDisplayModeIterator) != S_OK)
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{
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error = "Cannot get output Display Mode Iterator.";
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ReleaseResources();
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return false;
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}
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if (!FindDeckLinkDisplayMode(outputDisplayModeIterator, outputDisplayMode, &outputMode))
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{
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error = "Cannot get specified output BMDDisplayMode for configured mode: " + requestedOutputDisplayModeName;
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ReleaseResources();
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return false;
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}
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outputFrameWidth = outputMode->GetWidth();
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outputFrameHeight = outputMode->GetHeight();
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inputFrameWidth = inputMode ? inputMode->GetWidth() : outputFrameWidth;
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inputFrameHeight = inputMode ? inputMode->GetHeight() : outputFrameHeight;
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if (!input)
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inputDisplayModeName = "No input - black frame";
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outputMode->GetFrameRate(&frameDuration, &frameTimescale);
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return true;
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}
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bool DeckLinkSession::ConfigureInput(OpenGLComposite* owner, HDC hdc, HGLRC hglrc, BMDDisplayMode inputDisplayMode, std::string& error)
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{
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if (!input)
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{
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hasNoInputSource = true;
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inputDisplayModeName = "No input - black frame";
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return true;
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}
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CComPtr<IDeckLinkVideoBufferAllocatorProvider> captureAllocator(new (std::nothrow) InputAllocatorPool(hdc, hglrc));
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if (input->EnableVideoInputWithAllocatorProvider(inputDisplayMode, bmdFormat8BitYUV, bmdVideoInputFlagDefault, captureAllocator) != S_OK)
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{
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OutputDebugStringA("DeckLink input could not be enabled; continuing in output-only black-frame mode.\n");
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input.Release();
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hasNoInputSource = true;
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inputDisplayModeName = "No input - black frame";
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return true;
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}
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captureDelegate.Attach(new (std::nothrow) CaptureDelegate(owner));
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if (captureDelegate == nullptr)
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{
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error = "DeckLink input setup failed while creating the capture callback.";
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return false;
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}
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if (input->SetCallback(captureDelegate) != S_OK)
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{
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error = "DeckLink input setup failed while installing the capture callback.";
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return false;
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}
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return true;
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}
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bool DeckLinkSession::ConfigureOutput(OpenGLComposite* owner, HDC hdc, HGLRC hglrc, BMDDisplayMode outputDisplayMode, bool externalKeyingEnabled, std::string& error)
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{
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int outputFrameRowBytes = 0;
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if (output->RowBytesForPixelFormat(bmdFormat8BitBGRA, outputFrameWidth, &outputFrameRowBytes) != S_OK)
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{
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error = "DeckLink output setup failed while calculating BGRA row bytes.";
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return false;
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}
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playoutAllocator.Attach(new (std::nothrow) PinnedMemoryAllocator(hdc, hglrc, VideoFrameTransfer::GPUtoCPU, 1, outputFrameRowBytes * outputFrameHeight));
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if (playoutAllocator == nullptr)
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{
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error = "DeckLink output setup failed while creating the playout allocator.";
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return false;
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}
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if (output->EnableVideoOutput(outputDisplayMode, bmdVideoOutputFlagDefault) != S_OK)
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{
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error = "DeckLink output setup failed while enabling video output.";
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return false;
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}
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if (output->QueryInterface(IID_IDeckLinkKeyer, (void**)&keyer) == S_OK && keyer != NULL)
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keyerInterfaceAvailable = true;
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if (externalKeyingEnabled)
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{
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if (!supportsExternalKeying)
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{
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statusMessage = "External keying was requested, but the selected DeckLink output does not report external keying support.";
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}
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else if (!keyerInterfaceAvailable)
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{
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statusMessage = "External keying was requested, but the selected DeckLink output does not expose the IDeckLinkKeyer interface.";
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}
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else if (keyer->Enable(TRUE) != S_OK || keyer->SetLevel(255) != S_OK)
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{
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statusMessage = "External keying was requested, but enabling the DeckLink keyer failed.";
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}
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else
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{
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externalKeyingActive = true;
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statusMessage = "External keying is active on the selected DeckLink output.";
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}
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}
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else if (supportsExternalKeying)
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{
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statusMessage = "Selected DeckLink output supports external keying. Set enableExternalKeying to true in runtime-host.json to request it.";
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}
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for (int i = 0; i < 10; i++)
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{
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CComPtr<IDeckLinkMutableVideoFrame> outputFrame;
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CComPtr<IDeckLinkVideoBuffer> outputFrameBuffer;
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if (playoutAllocator->AllocateVideoBuffer(&outputFrameBuffer) != S_OK)
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{
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error = "DeckLink output setup failed while allocating an output frame buffer.";
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return false;
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}
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if (output->CreateVideoFrameWithBuffer(outputFrameWidth, outputFrameHeight, outputFrameRowBytes, bmdFormat8BitBGRA, bmdFrameFlagFlipVertical, outputFrameBuffer, &outputFrame) != S_OK)
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{
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error = "DeckLink output setup failed while creating an output video frame.";
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return false;
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}
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outputVideoFrameQueue.push_back(outputFrame);
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}
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playoutDelegate.Attach(new (std::nothrow) PlayoutDelegate(owner));
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if (playoutDelegate == nullptr)
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{
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error = "DeckLink output setup failed while creating the playout callback.";
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return false;
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}
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if (output->SetScheduledFrameCompletionCallback(playoutDelegate) != S_OK)
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{
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error = "DeckLink output setup failed while installing the scheduled-frame callback.";
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return false;
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}
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return true;
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}
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double DeckLinkSession::FrameBudgetMilliseconds() const
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{
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return frameTimescale != 0
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? (static_cast<double>(frameDuration) * 1000.0) / static_cast<double>(frameTimescale)
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: 0.0;
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}
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IDeckLinkMutableVideoFrame* DeckLinkSession::RotateOutputFrame()
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{
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CComPtr<IDeckLinkMutableVideoFrame> outputVideoFrame = outputVideoFrameQueue.front();
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outputVideoFrameQueue.push_back(outputVideoFrame);
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outputVideoFrameQueue.pop_front();
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return outputVideoFrame.p;
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}
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bool DeckLinkSession::TransferPlayoutFrame(void* address, GLuint outputTexture)
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{
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return playoutAllocator != nullptr && playoutAllocator->transferFrame(address, outputTexture);
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}
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void DeckLinkSession::WaitForPlayoutTransferComplete(void* address)
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{
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if (playoutAllocator != nullptr)
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playoutAllocator->waitForTransferComplete(address);
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}
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void DeckLinkSession::AccountForCompletionResult(BMDOutputFrameCompletionResult completionResult)
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{
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if (completionResult == bmdOutputFrameDisplayedLate || completionResult == bmdOutputFrameDropped)
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totalPlayoutFrames += 2;
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}
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bool DeckLinkSession::ScheduleOutputFrame(IDeckLinkMutableVideoFrame* outputVideoFrame)
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{
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if (output->ScheduleVideoFrame(outputVideoFrame, (totalPlayoutFrames * frameDuration), frameDuration, frameTimescale) != S_OK)
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return false;
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totalPlayoutFrames++;
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return true;
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}
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bool DeckLinkSession::Start()
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{
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totalPlayoutFrames = 0;
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if (!output)
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{
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MessageBoxA(NULL, "Cannot start playout because no DeckLink output device is available.", "DeckLink start failed", MB_OK | MB_ICONERROR);
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return false;
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}
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if (outputVideoFrameQueue.empty())
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{
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MessageBoxA(NULL, "Cannot start playout because the output frame queue is empty.", "DeckLink start failed", MB_OK | MB_ICONERROR);
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return false;
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}
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for (unsigned i = 0; i < kPrerollFrameCount; i++)
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{
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CComPtr<IDeckLinkMutableVideoFrame> outputVideoFrame = outputVideoFrameQueue.front();
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outputVideoFrameQueue.push_back(outputVideoFrame);
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outputVideoFrameQueue.pop_front();
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CComPtr<IDeckLinkVideoBuffer> outputVideoFrameBuffer;
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if (outputVideoFrame->QueryInterface(IID_IDeckLinkVideoBuffer, (void**)&outputVideoFrameBuffer) != S_OK)
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{
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MessageBoxA(NULL, "Could not query the preroll output frame buffer.", "DeckLink start failed", MB_OK | MB_ICONERROR);
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return false;
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}
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if (outputVideoFrameBuffer->StartAccess(bmdBufferAccessWrite) != S_OK)
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{
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MessageBoxA(NULL, "Could not write to the preroll output frame buffer.", "DeckLink start failed", MB_OK | MB_ICONERROR);
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return false;
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}
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void* pFrame;
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outputVideoFrameBuffer->GetBytes((void**)&pFrame);
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memset(pFrame, 0, outputVideoFrame->GetRowBytes() * outputFrameHeight);
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outputVideoFrameBuffer->EndAccess(bmdBufferAccessWrite);
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if (output->ScheduleVideoFrame(outputVideoFrame, (totalPlayoutFrames * frameDuration), frameDuration, frameTimescale) != S_OK)
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{
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MessageBoxA(NULL, "Could not schedule a preroll output frame.", "DeckLink start failed", MB_OK | MB_ICONERROR);
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return false;
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}
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totalPlayoutFrames++;
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}
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if (input)
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{
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if (input->StartStreams() != S_OK)
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{
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MessageBoxA(NULL, "Could not start the DeckLink input stream.", "DeckLink start failed", MB_OK | MB_ICONERROR);
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return false;
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}
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}
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if (output->StartScheduledPlayback(0, frameTimescale, 1.0) != S_OK)
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{
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MessageBoxA(NULL, "Could not start DeckLink scheduled playback.", "DeckLink start failed", MB_OK | MB_ICONERROR);
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return false;
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}
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return true;
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}
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bool DeckLinkSession::Stop()
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{
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if (keyer != nullptr)
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{
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keyer->Disable();
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externalKeyingActive = false;
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}
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if (input)
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{
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input->StopStreams();
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input->DisableVideoInput();
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}
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if (output)
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{
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output->StopScheduledPlayback(0, NULL, 0);
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output->DisableVideoOutput();
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}
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return true;
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}
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