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Implemented basic screen grabber using desktop duplication api

This commit is contained in:
weil 2024-01-30 23:14:12 +01:00
parent 18d2488c42
commit 511b4e13f7
2 changed files with 213 additions and 113 deletions
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316
src/platform/win32/capture_window.cpp
View File

@ -1,156 +1,246 @@
#include "capture_window.h"
#include "Windows.h"
#include <godot_cpp/variant/utility_functions.hpp>
#include <chrono>
#include <d3d11.h>
#include <dxgi1_2.h>
#include <wrl/client.h>
#pragma comment(lib, "d3d11.lib")
#pragma comment(lib, "dxgi.lib")
//#define PROFILER_ENABLED
using namespace godot;
namespace microtaur
{
namespace
class AcceleratedWindowCapturer
{
struct Bitmap {
HBITMAP bmp;
int width;
int height;
};
struct MonitorEnumData {
int targetMonitorIndex;
int currentMonitorIndex;
HMONITOR hMonitor;
};
BOOL CALLBACK MonitorEnumProc(HMONITOR hMonitor, HDC hdcMonitor, LPRECT lprcMonitor, LPARAM dwData) {
MonitorEnumData* pData = reinterpret_cast<MonitorEnumData*>(dwData);
if (pData->currentMonitorIndex == pData->targetMonitorIndex) {
pData->hMonitor = hMonitor;
return FALSE;
}
pData->currentMonitorIndex++;
return TRUE;
}
Bitmap CaptureScreen(int screenId) {
MonitorEnumData med;
med.targetMonitorIndex = screenId;
med.currentMonitorIndex = 0;
med.hMonitor = nullptr;
EnumDisplayMonitors(NULL, NULL, MonitorEnumProc, reinterpret_cast<LPARAM>(&med));
if (med.hMonitor == nullptr) {
// No monitor found with the given ID
return { NULL, 0, 0 };
public:
AcceleratedWindowCapturer() {
init();
}
MONITORINFOEX mi;
mi.cbSize = sizeof(mi);
GetMonitorInfo(med.hMonitor, &mi);
void init()
{
D3D_FEATURE_LEVEL featureLevel = D3D_FEATURE_LEVEL_11_0;
auto hr = D3D11CreateDevice(
nullptr,
D3D_DRIVER_TYPE_HARDWARE,
nullptr,
0,
&featureLevel,
1,
D3D11_SDK_VERSION,
&m_device,
nullptr,
&m_context
);
if (FAILED(hr)) {
reset();
return;
}
HDC hMonitorDC = CreateDC(TEXT("DISPLAY"), mi.szDevice, NULL, NULL);
HDC hMemoryDC = CreateCompatibleDC(hMonitorDC);
IDXGIDevice* dxgiDevice = nullptr;
hr = m_device->QueryInterface(__uuidof(IDXGIDevice), reinterpret_cast<void**>(&dxgiDevice));
if (FAILED(hr)) {
reset();
return;
}
int width = mi.rcMonitor.right - mi.rcMonitor.left;
int height = mi.rcMonitor.bottom - mi.rcMonitor.top;
IDXGIAdapter* dxgiAdapter = nullptr;
hr = dxgiDevice->GetParent(__uuidof(IDXGIAdapter), reinterpret_cast<void**>(&dxgiAdapter));
if (FAILED(hr)) {
reset();
return;
}
dxgiDevice->Release();
HBITMAP hBitmap = CreateCompatibleBitmap(hMonitorDC, width, height);
HBITMAP hOldBitmap = static_cast<HBITMAP>(SelectObject(hMemoryDC, hBitmap));
BitBlt(hMemoryDC, 0, 0, width, height, hMonitorDC, 0, 0, SRCCOPY);
SelectObject(hMemoryDC, hOldBitmap);
IDXGIOutput* dxgiOutput = nullptr;
hr = dxgiAdapter->EnumOutputs(1, &dxgiOutput); // TODO: screen choose
if (FAILED(hr)) {
reset();
return;
}
dxgiAdapter->Release();
DeleteDC(hMemoryDC);
DeleteDC(hMonitorDC);
IDXGIOutput1* dxgiOutput1 = nullptr;
hr = dxgiOutput->QueryInterface(__uuidof(IDXGIOutput1), reinterpret_cast<void**>(&dxgiOutput1));
if (FAILED(hr)) {
reset();
return;
}
dxgiOutput->Release();
return { hBitmap, width, height };
}
// Get desktop duplication
hr = dxgiOutput1->DuplicateOutput(m_device.Get(), &m_duplication);
if (FAILED(hr)) {
reset();
return;
}
dxgiOutput1->Release();
}
void RGBtoYUV(BYTE R, BYTE G, BYTE B, BYTE& Y, BYTE& U, BYTE& V) {
int yTemp = 0.299 * R + 0.587 * G + 0.114 * B;
int uTemp = -0.14713 * R - 0.28886 * G + 0.436 * B + 128;
int vTemp = 0.615 * R - 0.51498 * G - 0.10001 * B + 128;
Frame nextFrame()
{
IDXGIResource* desktopResource = nullptr;
DXGI_OUTDUPL_FRAME_INFO frameInfo;
Y = static_cast<BYTE>(std::max(0, std::min(255, yTemp)));
U = static_cast<BYTE>(std::max(0, std::min(255, uTemp)));
V = static_cast<BYTE>(std::max(0, std::min(255, vTemp)));
}
if (m_frameAcquired) {
m_duplication->ReleaseFrame();
m_frameAcquired = false;
}
HRESULT hr = m_duplication->AcquireNextFrame(INFINITE, &frameInfo, &desktopResource);
if (FAILED(hr)) {
if (hr == DXGI_ERROR_ACCESS_LOST) {
// TODO
}
// Function to create YUV frame_data from HBITMAP
std::vector<uint8_t> CreateYUVFrameFromHBITMAP(HBITMAP hBitmap, int width, int height) {
// Calculate the size for YUV 4:2:0 format
std::vector<uint8_t> data(width * height + (width * height) / 4 + (width * height) / 4);
return {};
}
m_frameAcquired = true;
HDC hdcScreen = GetDC(NULL);
HDC hdcMem = CreateCompatibleDC(hdcScreen);
// Get the DXGI surface
hr = desktopResource->QueryInterface(__uuidof(ID3D11Texture2D), reinterpret_cast<void**>(m_desktopTexture.GetAddressOf()));
if (FAILED(hr)) {
desktopResource->Release();
m_duplication->ReleaseFrame();
return {};
}
BITMAPINFOHEADER bi;
memset(&bi, 0, sizeof(bi));
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = width;
bi.biHeight = -height; // Negative height for top-down bitmap
bi.biPlanes = 1;
bi.biBitCount = 24; // Assuming RGB 24-bit format
bi.biCompression = BI_RGB;
// Create a staging texture if that's necessary
D3D11_TEXTURE2D_DESC desc;
m_desktopTexture->GetDesc(&desc);
// First call to GetDIBits to populate biSizeImage
GetDIBits(hdcMem, hBitmap, 0, height, NULL, (BITMAPINFO*)&bi, DIB_RGB_COLORS);
BYTE* rgbData = new BYTE[bi.biSizeImage];
if (!m_stagingTexture || m_width != desc.Width || m_height == desc.Height) {
m_width = desc.Width;
m_height = desc.Height;
// Second call to GetDIBits to get the actual bitmap data
GetDIBits(hdcMem, hBitmap, 0, height, rgbData, (BITMAPINFO*)&bi, DIB_RGB_COLORS);
desc.Usage = D3D11_USAGE_STAGING;
desc.BindFlags = 0;
desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
desc.MiscFlags = 0;
m_device->CreateTexture2D(&desc, nullptr, &m_stagingTexture);
// Calculate the stride for the bitmap
int stride = ((width * bi.biBitCount + 31) / 32) * 4; // Bitmap scanline padding
if (!m_stagingTexture) {
desktopResource->Release();
m_duplication->ReleaseFrame();
return {};
}
}
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
// Correct index with stride
int i = (y * stride) + (x * 3);
BYTE B = rgbData[i];
BYTE G = rgbData[i + 1];
BYTE R = rgbData[i + 2];
m_context->CopyResource(m_stagingTexture.Get(), m_desktopTexture.Get());
desktopResource->Release();
BYTE Y, U, V;
RGBtoYUV(R, G, B, Y, U, V);
D3D11_MAPPED_SUBRESOURCE mappedResource;
hr = m_context->Map(m_stagingTexture.Get(), 0, D3D11_MAP_READ, 0, &mappedResource);
if (FAILED(hr)) {
m_stagingTexture->Release();
return { m_width, m_height, m_buffer };
}
data.data()[y * width + x] = Y;
// Convert BGRA to YUV420
const auto yuvSize = m_width * m_height * 3 / 2;
if (m_buffer.size() != yuvSize) {
m_buffer.resize(yuvSize);
}
// Correct subsampling for U and V components
if (x % 2 == 0 && y % 2 == 0) {
int uvIndex = (y / 2) * (width / 2) + (x / 2);
data.data()[width * height + uvIndex] = U; // U plane
data.data()[width * height + (width * height / 4) + uvIndex] = V; // V plane
rgbToYuv(mappedResource, m_width, m_height);
// Unmap and release the staging texture
m_context->Unmap(m_stagingTexture.Get(), 0);
return {m_width, m_height, m_buffer};
}
void rgbToYuv(D3D11_MAPPED_SUBRESOURCE mappedResource, size_t width, size_t height)
{
auto srcPtr = static_cast<uint8_t*>(mappedResource.pData);
// Lambda functions for YUV conversion
auto rgbToY = [](uint8_t r, uint8_t g, uint8_t b) -> uint8_t {
return static_cast<uint8_t>((0.299 * r) + (0.587 * g) + (0.114 * b));
};
auto rgbToU = [](uint8_t r, uint8_t g, uint8_t b, int& sumU) -> uint8_t {
sumU += (128 - (0.168736 * r) - (0.331264 * g) + (0.5 * b));
return 0; // Placeholder, real value computed in averaging step
};
auto rgbToV = [](uint8_t r, uint8_t g, uint8_t b, int& sumV) -> uint8_t {
sumV += (128 + (0.5 * r) - (0.418688 * g) - (0.081312 * b));
return 0; // Placeholder, real value computed in averaging step
};
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int srcIndex = (y * mappedResource.RowPitch) + (x * 4); // 4 bytes per pixel in source (BGRA)
uint8_t b = srcPtr[srcIndex];
uint8_t g = srcPtr[srcIndex + 1];
uint8_t r = srcPtr[srcIndex + 2];
// Set Y value
m_buffer[y * width + x] = rgbToY(r, g, b);
// Compute and average U and V values for 2x2 blocks
if (x % 2 == 0 && y % 2 == 0) {
int sumU = 0, sumV = 0;
for (int dy = 0; dy < 2; ++dy) {
for (int dx = 0; dx < 2; ++dx) {
if ((y + dy) < height && (x + dx) < width) {
int i = (y + dy) * width + (x + dx);
rgbToU(r, g, b, sumU);
rgbToV(r, g, b, sumV);
}
}
}
int uvIndex = width * height + (y / 2) * (width / 2) + (x / 2);
m_buffer[uvIndex] = sumU / 4; // Average U
m_buffer[uvIndex + width * height / 4] = sumV / 4; // Average V
}
}
}
}
// Clean up resources
DeleteDC(hdcMem);
ReleaseDC(NULL, hdcScreen);
delete[] rgbData;
void reset()
{
// TODO: cleanup
}
return data;
private:
Microsoft::WRL::ComPtr<ID3D11Device> m_device;
Microsoft::WRL::ComPtr<ID3D11DeviceContext> m_context;
Microsoft::WRL::ComPtr<IDXGIOutputDuplication> m_duplication;
Microsoft::WRL::ComPtr<ID3D11Texture2D> m_desktopTexture;
Microsoft::WRL::ComPtr<ID3D11Texture2D> m_stagingTexture;
std::vector<uint8_t> m_buffer;
bool m_frameAcquired{ false };
size_t m_width{};
size_t m_height{};
};
WindowCapturer::WindowCapturer()
: m_impl(std::make_unique<AcceleratedWindowCapturer>())
{
}
WindowCapturer::~WindowCapturer()
{
}
Frame WindowCapturer::capture(size_t id)
{
const auto start = std::chrono::high_resolution_clock::now();
auto bitmap = CaptureScreen(id);
auto out = Frame{
static_cast<size_t>(bitmap.width),
static_cast<size_t>(bitmap.height),
CreateYUVFrameFromHBITMAP(bitmap.bmp, bitmap.width, bitmap.height)
};
DeleteObject(bitmap.bmp);
return out;
return m_impl->nextFrame();
}
}

10
src/platform/win32/capture_window.h
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@ -1,6 +1,7 @@
#pragma once
#include <stdint.h>
#include <vector>
#include <memory>
namespace microtaur {
@ -11,10 +12,19 @@ struct Frame
std::vector<uint8_t> data;
};
class AcceleratedWindowCapturer;
class WindowCapturer
{
public:
WindowCapturer();
~WindowCapturer();
Frame capture(size_t id = 0);
private:
std::unique_ptr<AcceleratedWindowCapturer> m_impl;
};
}