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opencv/samples/directx/d3d11_interop.cpp

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/*
// Sample demonstrating interoperability of OpenCV UMat with Direct X surface
// At first, the data obtained from video file or camera and
// placed onto Direct X surface,
// following mapping of this Direct X surface to OpenCV UMat and call cv::Blur
// function. The result is mapped back to Direct X surface and rendered through
// Direct X API.
*/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <d3d11.h>
#include "opencv2/core.hpp"
#include "opencv2/core/directx.hpp"
#include "opencv2/core/ocl.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/videoio.hpp"
#include "d3dsample.hpp"
#pragma comment (lib, "d3d11.lib")
using namespace std;
using namespace cv;
class D3D11WinApp : public D3DSample
{
public:
D3D11WinApp(int width, int height, std::string& window_name, cv::VideoCapture& cap)
: D3DSample(width, height, window_name, cap),
m_nv12_available(false)
{}
~D3D11WinApp() {}
int create(void)
{
// base initialization
D3DSample::create();
// initialize DirectX
HRESULT r;
DXGI_SWAP_CHAIN_DESC scd;
ZeroMemory(&scd, sizeof(DXGI_SWAP_CHAIN_DESC));
scd.BufferCount = 1; // one back buffer
scd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; // use 32-bit color
scd.BufferDesc.Width = m_width; // set the back buffer width
scd.BufferDesc.Height = m_height; // set the back buffer height
scd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT; // how swap chain is to be used
scd.OutputWindow = m_hWnd; // the window to be used
scd.SampleDesc.Count = 1; // how many multisamples
scd.Windowed = TRUE; // windowed/full-screen mode
scd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
scd.Flags = DXGI_SWAP_CHAIN_FLAG_ALLOW_MODE_SWITCH; // allow full-screen switching
r = ::D3D11CreateDeviceAndSwapChain(
NULL,
D3D_DRIVER_TYPE_HARDWARE,
NULL,
0,
NULL,
0,
D3D11_SDK_VERSION,
&scd,
&m_pD3D11SwapChain,
&m_pD3D11Dev,
NULL,
&m_pD3D11Ctx);
if (FAILED(r))
{
throw std::runtime_error("D3D11CreateDeviceAndSwapChain() failed!");
}
#if defined(_WIN32_WINNT_WIN8) && _WIN32_WINNT >= _WIN32_WINNT_WIN8
UINT fmt = 0;
r = m_pD3D11Dev->CheckFormatSupport(DXGI_FORMAT_NV12, &fmt);
if (SUCCEEDED(r))
{
m_nv12_available = true;
}
#endif
r = m_pD3D11SwapChain->GetBuffer(0, __uuidof(ID3D11Texture2D), (LPVOID*)&m_pBackBuffer);
if (FAILED(r))
{
throw std::runtime_error("GetBufer() failed!");
}
r = m_pD3D11Dev->CreateRenderTargetView(m_pBackBuffer, NULL, &m_pRenderTarget);
if (FAILED(r))
{
throw std::runtime_error("CreateRenderTargetView() failed!");
}
m_pD3D11Ctx->OMSetRenderTargets(1, &m_pRenderTarget, NULL);
D3D11_VIEWPORT viewport;
ZeroMemory(&viewport, sizeof(D3D11_VIEWPORT));
viewport.Width = (float)m_width;
viewport.Height = (float)m_height;
viewport.MinDepth = 0.0f;
viewport.MaxDepth = 0.0f;
m_pD3D11Ctx->RSSetViewports(1, &viewport);
m_pSurfaceRGBA = 0;
m_pSurfaceNV12 = 0;
m_pSurfaceNV12_cpu_copy = 0;
D3D11_TEXTURE2D_DESC desc_rgba;
desc_rgba.Width = m_width;
desc_rgba.Height = m_height;
desc_rgba.MipLevels = 1;
desc_rgba.ArraySize = 1;
desc_rgba.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
desc_rgba.SampleDesc.Count = 1;
desc_rgba.SampleDesc.Quality = 0;
desc_rgba.BindFlags = D3D11_BIND_SHADER_RESOURCE;
desc_rgba.Usage = D3D11_USAGE_DYNAMIC;
desc_rgba.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
desc_rgba.MiscFlags = 0;
r = m_pD3D11Dev->CreateTexture2D(&desc_rgba, 0, &m_pSurfaceRGBA);
if (FAILED(r))
{
throw std::runtime_error("Can't create DX texture");
}
#if defined(_WIN32_WINNT_WIN8) && _WIN32_WINNT >= _WIN32_WINNT_WIN8
if(m_nv12_available)
{
D3D11_TEXTURE2D_DESC desc_nv12;
desc_nv12.Width = m_width;
desc_nv12.Height = m_height;
desc_nv12.MipLevels = 1;
desc_nv12.ArraySize = 1;
desc_nv12.Format = DXGI_FORMAT_NV12;
desc_nv12.SampleDesc.Count = 1;
desc_nv12.SampleDesc.Quality = 0;
desc_nv12.BindFlags = D3D11_BIND_SHADER_RESOURCE;
desc_nv12.Usage = D3D11_USAGE_DEFAULT;
desc_nv12.CPUAccessFlags = 0;
desc_nv12.MiscFlags = D3D11_RESOURCE_MISC_SHARED;
r = m_pD3D11Dev->CreateTexture2D(&desc_nv12, 0, &m_pSurfaceNV12);
if (FAILED(r))
{
throw std::runtime_error("Can't create DX NV12 texture");
}
D3D11_TEXTURE2D_DESC desc_nv12_cpu_copy;
desc_nv12_cpu_copy.Width = m_width;
desc_nv12_cpu_copy.Height = m_height;
desc_nv12_cpu_copy.MipLevels = 1;
desc_nv12_cpu_copy.ArraySize = 1;
desc_nv12_cpu_copy.Format = DXGI_FORMAT_NV12;
desc_nv12_cpu_copy.SampleDesc.Count = 1;
desc_nv12_cpu_copy.SampleDesc.Quality = 0;
desc_nv12_cpu_copy.BindFlags = 0;
desc_nv12_cpu_copy.Usage = D3D11_USAGE_STAGING;
desc_nv12_cpu_copy.CPUAccessFlags = /*D3D11_CPU_ACCESS_WRITE | */D3D11_CPU_ACCESS_READ;
desc_nv12_cpu_copy.MiscFlags = 0;
r = m_pD3D11Dev->CreateTexture2D(&desc_nv12_cpu_copy, 0, &m_pSurfaceNV12_cpu_copy);
if (FAILED(r))
{
throw std::runtime_error("Can't create DX NV12 texture");
}
}
#endif
// initialize OpenCL context of OpenCV lib from DirectX
if (cv::ocl::haveOpenCL())
{
m_oclCtx = cv::directx::ocl::initializeContextFromD3D11Device(m_pD3D11Dev);
}
m_oclDevName = cv::ocl::useOpenCL() ?
cv::ocl::Context::getDefault().device(0).name() :
"No OpenCL device";
return 0;
} // create()
// get media data on DX surface for further processing
int get_surface(ID3D11Texture2D** ppSurface, bool use_nv12)
{
HRESULT r;
if (!m_cap.read(m_frame_bgr))
return -1;
if (use_nv12)
{
cv::cvtColor(m_frame_bgr, m_frame_i420, CV_BGR2YUV_I420);
convert_I420_to_NV12(m_frame_i420, m_frame_nv12, m_width, m_height);
m_pD3D11Ctx->UpdateSubresource(m_pSurfaceNV12, 0, 0, m_frame_nv12.data, (UINT)m_frame_nv12.step[0], (UINT)m_frame_nv12.total());
}
else
{
cv::cvtColor(m_frame_bgr, m_frame_rgba, CV_BGR2RGBA);
// process video frame on CPU
UINT subResource = ::D3D11CalcSubresource(0, 0, 1);
D3D11_MAPPED_SUBRESOURCE mappedTex;
r = m_pD3D11Ctx->Map(m_pSurfaceRGBA, subResource, D3D11_MAP_WRITE_DISCARD, 0, &mappedTex);
if (FAILED(r))
{
throw std::runtime_error("surface mapping failed!");
}
cv::Mat m(m_height, m_width, CV_8UC4, mappedTex.pData, mappedTex.RowPitch);
m_frame_rgba.copyTo(m);
m_pD3D11Ctx->Unmap(m_pSurfaceRGBA, subResource);
}
*ppSurface = use_nv12 ? m_pSurfaceNV12 : m_pSurfaceRGBA;
return 0;
} // get_surface()
// process and render media data
int render()
{
try
{
if (m_shutdown)
return 0;
// capture user input once
MODE mode = (m_mode == MODE_GPU_NV12 && !m_nv12_available) ? MODE_GPU_RGBA : m_mode;
HRESULT r;
ID3D11Texture2D* pSurface = 0;
r = get_surface(&pSurface, mode == MODE_GPU_NV12);
if (FAILED(r))
{
throw std::runtime_error("get_surface() failed!");
}
m_timer.start();
switch (mode)
{
case MODE_CPU:
{
// process video frame on CPU
UINT subResource = ::D3D11CalcSubresource(0, 0, 1);
D3D11_MAPPED_SUBRESOURCE mappedTex;
r = m_pD3D11Ctx->Map(pSurface, subResource, D3D11_MAP_WRITE_DISCARD, 0, &mappedTex);
if (FAILED(r))
{
throw std::runtime_error("surface mapping failed!");
}
cv::Mat m(m_height, m_width, CV_8UC4, mappedTex.pData, (int)mappedTex.RowPitch);
if (m_demo_processing)
{
// blur data from D3D11 surface with OpenCV on CPU
cv::blur(m, m, cv::Size(15, 15), cv::Point(-7, -7));
}
cv::String strMode = cv::format("mode: %s", m_modeStr[MODE_CPU].c_str());
cv::String strProcessing = m_demo_processing ? "blur frame" : "copy frame";
cv::String strTime = cv::format("time: %4.1f msec", m_timer.time(Timer::UNITS::MSEC));
cv::String strDevName = cv::format("OpenCL device: %s", m_oclDevName.c_str());
cv::putText(m, strMode, cv::Point(0, 16), 1, 0.8, cv::Scalar(0, 0, 0));
cv::putText(m, strProcessing, cv::Point(0, 32), 1, 0.8, cv::Scalar(0, 0, 0));
cv::putText(m, strTime, cv::Point(0, 48), 1, 0.8, cv::Scalar(0, 0, 0));
cv::putText(m, strDevName, cv::Point(0, 64), 1, 0.8, cv::Scalar(0, 0, 0));
m_pD3D11Ctx->Unmap(pSurface, subResource);
break;
}
case MODE_GPU_RGBA:
case MODE_GPU_NV12:
{
// process video frame on GPU
cv::UMat u;
cv::directx::convertFromD3D11Texture2D(pSurface, u);
if (m_demo_processing)
{
// blur data from D3D11 surface with OpenCV on GPU with OpenCL
cv::blur(u, u, cv::Size(15, 15), cv::Point(-7, -7));
}
cv::String strMode = cv::format("mode: %s", m_modeStr[mode].c_str());
cv::String strProcessing = m_demo_processing ? "blur frame" : "copy frame";
cv::String strTime = cv::format("time: %4.1f msec", m_timer.time(Timer::UNITS::MSEC));
cv::String strDevName = cv::format("OpenCL device: %s", m_oclDevName.c_str());
cv::putText(u, strMode, cv::Point(0, 16), 1, 0.8, cv::Scalar(0, 0, 0));
cv::putText(u, strProcessing, cv::Point(0, 32), 1, 0.8, cv::Scalar(0, 0, 0));
cv::putText(u, strTime, cv::Point(0, 48), 1, 0.8, cv::Scalar(0, 0, 0));
cv::putText(u, strDevName, cv::Point(0, 64), 1, 0.8, cv::Scalar(0, 0, 0));
cv::directx::convertToD3D11Texture2D(u, pSurface);
if (mode == MODE_GPU_NV12)
{
// just for rendering, we need to convert NV12 to RGBA.
m_pD3D11Ctx->CopyResource(m_pSurfaceNV12_cpu_copy, m_pSurfaceNV12);
// process video frame on CPU
{
UINT subResource = ::D3D11CalcSubresource(0, 0, 1);
D3D11_MAPPED_SUBRESOURCE mappedTex;
r = m_pD3D11Ctx->Map(m_pSurfaceNV12_cpu_copy, subResource, D3D11_MAP_READ, 0, &mappedTex);
if (FAILED(r))
{
throw std::runtime_error("surface mapping failed!");
}
cv::Mat frame_nv12(m_height + (m_height / 2), m_width, CV_8UC1, mappedTex.pData, mappedTex.RowPitch);
cv::cvtColor(frame_nv12, m_frame_rgba, CV_YUV2RGBA_NV12);
m_pD3D11Ctx->Unmap(m_pSurfaceNV12_cpu_copy, subResource);
}
{
UINT subResource = ::D3D11CalcSubresource(0, 0, 1);
D3D11_MAPPED_SUBRESOURCE mappedTex;
r = m_pD3D11Ctx->Map(m_pSurfaceRGBA, subResource, D3D11_MAP_WRITE_DISCARD, 0, &mappedTex);
if (FAILED(r))
{
throw std::runtime_error("surface mapping failed!");
}
cv::Mat m(m_height, m_width, CV_8UC4, mappedTex.pData, mappedTex.RowPitch);
m_frame_rgba.copyTo(m);
m_pD3D11Ctx->Unmap(m_pSurfaceRGBA, subResource);
}
pSurface = m_pSurfaceRGBA;
}
break;
}
} // switch
m_timer.stop();
// traditional DX render pipeline:
// BitBlt surface to backBuffer and flip backBuffer to frontBuffer
m_pD3D11Ctx->CopyResource(m_pBackBuffer, pSurface);
// present the back buffer contents to the display
// switch the back buffer and the front buffer
r = m_pD3D11SwapChain->Present(0, 0);
if (FAILED(r))
{
throw std::runtime_error("switch betweem fronat and back buffers failed!");
}
} // try
catch (cv::Exception& e)
{
std::cerr << "Exception: " << e.what() << std::endl;
cleanup();
return 10;
}
catch (const std::exception& e)
{
std::cerr << "Exception: " << e.what() << std::endl;
cleanup();
return 11;
}
return 0;
} // render()
int cleanup(void)
{
SAFE_RELEASE(m_pSurfaceRGBA);
SAFE_RELEASE(m_pSurfaceNV12);
SAFE_RELEASE(m_pSurfaceNV12_cpu_copy);
SAFE_RELEASE(m_pBackBuffer);
SAFE_RELEASE(m_pD3D11SwapChain);
SAFE_RELEASE(m_pRenderTarget);
SAFE_RELEASE(m_pD3D11Dev);
SAFE_RELEASE(m_pD3D11Ctx);
D3DSample::cleanup();
return 0;
} // cleanup()
protected:
void convert_I420_to_NV12(cv::Mat& i420, cv::Mat& nv12, int width, int height)
{
nv12.create(i420.rows, i420.cols, CV_8UC1);
unsigned char* pSrcY = i420.data;
unsigned char* pDstY = nv12.data;
size_t srcStep = i420.step[0];
size_t dstStep = nv12.step[0];
{
unsigned char* src;
unsigned char* dst;
// copy Y plane
for (int i = 0; i < height; i++)
{
src = pSrcY + i*srcStep;
dst = pDstY + i*dstStep;
for (int j = 0; j < width; j++)
{
dst[j] = src[j];
}
}
}
{
// copy U/V planes to UV plane
unsigned char* pSrcU;
unsigned char* pSrcV;
unsigned char* pDstUV;
size_t uv_offset = height * dstStep;
for (int i = 0; i < height / 2; i++)
{
pSrcU = pSrcY + height*width + i*(width / 2);
pSrcV = pSrcY + height*width + (height / 2) * (width / 2) + i*(width / 2);
pDstUV = pDstY + uv_offset + i*dstStep;
for (int j = 0; j < width / 2; j++)
{
pDstUV[j*2 + 0] = pSrcU[j];
pDstUV[j*2 + 1] = pSrcV[j];
}
}
}
return;
}
private:
ID3D11Device* m_pD3D11Dev;
IDXGISwapChain* m_pD3D11SwapChain;
ID3D11DeviceContext* m_pD3D11Ctx;
ID3D11Texture2D* m_pBackBuffer;
ID3D11Texture2D* m_pSurfaceRGBA;
ID3D11Texture2D* m_pSurfaceNV12;
ID3D11Texture2D* m_pSurfaceNV12_cpu_copy;
ID3D11RenderTargetView* m_pRenderTarget;
cv::ocl::Context m_oclCtx;
cv::String m_oclPlatformName;
cv::String m_oclDevName;
bool m_nv12_available;
cv::Mat m_frame_i420;
cv::Mat m_frame_nv12;
};
// main func
int main(int argc, char** argv)
{
std::string title = "D3D11 interop sample";
return d3d_app<D3D11WinApp>(argc, argv, title);
}
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