winscreencap: Add dxgiscreencapsrc element.

This element uses the Desktop Duplication API to capture the desktop screen at high speed.
It supports Windows 8 or later.

It has the following features compared to other elements:
 * Runs faster.
 * It works in High DPI environment.
 * Draws an accurate mouse cursor.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/863>

6 files changed, 2033 insertions, 4 deletions

diff --git a/sys/winscreencap/dxgicapture.c b/sys/winscreencap/dxgicapture.c
new file mode 100644
index 000000000..18c82878b
--- /dev/null
+++ b/sys/winscreencap/dxgicapture.c
@@ -0,0 +1,1313 @@
+/* GStreamer
+ * Copyright (C) 2019 OKADA Jun-ichi <okada@abt.jp>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/* This code captures the screen using "Desktop Duplication API".
+ * For more information 
+ * https://docs.microsoft.com/en-us/windows/win32/direct3ddxgi/desktop-dup-api */
+
+#include "dxgicapture.h"
+
+#include <d3dcompiler.h>
+
+#define PTR_RELEASE(p) {if(NULL!=(p)){IUnknown_Release((IUnknown *)(p)); (p) = NULL;}}
+#define BYTE_PER_PIXEL (4)
+
+/* vertex structures */
+typedef struct _vector3d
+{
+  float x;
+  float y;
+  float z;
+} vector3d;
+
+typedef struct _vector2d
+{
+  float x;
+  float y;
+} vector2d;
+
+typedef struct _vertex
+{
+  vector3d pos;
+  vector2d texcoord;
+} vertex;
+#define VERTEX_NUM (6);
+
+typedef struct _DxgiCapture
+{
+  GstDXGIScreenCapSrc *src;
+
+  /*Direct3D pointers */
+  ID3D11Device *d3d11_device;
+  ID3D11DeviceContext *d3d11_context;
+  IDXGIOutputDuplication *dxgi_dupl;
+
+  /* Texture that has been rotated and combined fragments. */
+  ID3D11Texture2D *work_texture;
+  D3D11_TEXTURE2D_DESC work_texture_desc;
+  D3D11_VIEWPORT view_port;
+  /* Textures that can be read by the CPU. 
+   * CPU-accessible textures are required separately from work_texture 
+   * because shaders cannot be executed. */
+  ID3D11Texture2D *readable_texture;
+  ID3D11VertexShader *vertex_shader;
+  ID3D11PixelShader *pixel_shader;
+  ID3D11SamplerState *sampler_state;
+  ID3D11RenderTargetView *target_view;
+  /* Screen output dimensions and rotation status.
+   * The texture acquired by AcquireNextFrame has a non-rotated region. */
+  DXGI_OUTDUPL_DESC dupl_desc;
+
+  /* mouse pointer image */
+  guint8 *pointer_buffer;
+  gsize pointer_buffer_capacity;
+
+  /* The movement rectangular regions and the movement 
+   * destination position from the previous frame. */
+  DXGI_OUTDUPL_MOVE_RECT *move_rects;
+  gsize move_rects_capacity;
+
+  /* Array of dirty rectangular region for the desktop frame. */
+  RECT *dirty_rects;
+  gsize dirty_rects_capacity;
+
+  /* Vertex buffer created from array of dirty rectangular region. */
+  vertex *dirty_verteces;
+  gsize verteces_capacity;
+
+  /* Array of rectangular region to copy to readable_texture. */
+  RECT *copy_rects;
+  gsize copy_rects_capacity;
+
+  /* latest mouse pointer info */
+  DXGI_OUTDUPL_POINTER_SHAPE_INFO pointer_shape_info;
+  DXGI_OUTDUPL_POINTER_POSITION last_pointer_position;
+
+} DxgiCapture;
+
+/* Vertex shader for texture rotation by HLSL. */
+static const char STR_VERTEX_SHADER[] =
+    "struct vs_input  { float4 pos : POSITION; float2 tex : TEXCOORD; }; "
+    "struct vs_output { float4 pos : SV_POSITION; float2 tex : TEXCOORD; }; "
+    "vs_output vs_main(vs_input input){return input;}";
+
+/* Pixel shader for texture rotation by HLSL. */
+static const char STR_PIXEL_SHADER[] =
+    "Texture2D tx : register( t0 ); "
+    "SamplerState samp : register( s0 ); "
+    "struct ps_input { float4 pos : SV_POSITION; float2 tex : TEXCOORD;}; "
+    "float4 ps_main(ps_input input) : "
+    "SV_Target{ return tx.Sample( samp, input.tex ); }";
+
+/* initial buffer size */
+const int INITIAL_POINTER_BUFFER_CAPACITY = 64 * 64 * BYTE_PER_PIXEL;
+const int INITIAL_MOVE_RECTS_CAPACITY = 100;
+const int INITIAL_DIRTY_RECTS_CAPACITY = 100;
+const int INITIAL_VERTICES_CAPACITY = 100 * VERTEX_NUM;
+const int INITIAL_COPY_RECTS_CAPACITY = 100;
+
+static D3D_FEATURE_LEVEL feature_levels[] = {
+  D3D_FEATURE_LEVEL_11_0,
+  D3D_FEATURE_LEVEL_10_1,
+  D3D_FEATURE_LEVEL_10_0,
+  D3D_FEATURE_LEVEL_9_3,
+  D3D_FEATURE_LEVEL_9_2,
+  D3D_FEATURE_LEVEL_9_1,
+};
+
+static D3D11_INPUT_ELEMENT_DESC vertex_layout[] = {
+  {"POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0,
+      D3D11_INPUT_PER_VERTEX_DATA, 0},
+  {"TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA,
+      0}
+};
+
+static void _draw_pointer (DxgiCapture * self, LPBYTE buffer, LPRECT dst_rect,
+    int stride);
+static ID3D11Texture2D *_create_texture (DxgiCapture * self,
+    enum D3D11_USAGE usage, UINT bindFlags, UINT cpuAccessFlags);
+
+static gboolean _setup_texture (DxgiCapture * self);
+
+static HRESULT _update_work_texture (DxgiCapture * self,
+    IDXGIResource * desktop_resource);
+
+static HRESULT _copy_dirty_fragment (DxgiCapture * self,
+    ID3D11Texture2D * src_texture, const D3D11_TEXTURE2D_DESC * src_desc,
+    guint move_count, guint dirty_count, RECT ** dst_rect);
+
+static void _set_verteces (DxgiCapture * self, vertex * verteces,
+    RECT * dest_rect, const D3D11_TEXTURE2D_DESC * dst_desc, RECT * rect,
+    const D3D11_TEXTURE2D_DESC * src_desc);
+
+DxgiCapture *
+dxgicap_new (HMONITOR monitor, GstDXGIScreenCapSrc * src)
+{
+  int i, j;
+  HRESULT hr;
+  IDXGIFactory1 *dxgi_factory1 = NULL;
+  IDXGIOutput1 *dxgi_output1 = NULL;
+  IDXGIAdapter1 *dxgi_adapter1 = NULL;
+  ID3D11InputLayout *vertex_input_layout = NULL;
+  ID3DBlob *vertex_shader_blob = NULL;
+  ID3DBlob *pixel_shader_blob = NULL;
+  D3D11_SAMPLER_DESC sampler_desc;
+
+  DxgiCapture *self = g_new0 (DxgiCapture, 1);
+  if (NULL == self) {
+    return NULL;
+  }
+
+  self->src = src;
+  hr = CreateDXGIFactory1 (&IID_IDXGIFactory1, (void **) &dxgi_factory1);
+  HR_FAILED_GOTO (hr, CreateDXGIFactory1, new_error);
+
+  dxgi_output1 = NULL;
+  for (i = 0;
+      IDXGIFactory1_EnumAdapters1 (dxgi_factory1, i,
+          &dxgi_adapter1) != DXGI_ERROR_NOT_FOUND; ++i) {
+    IDXGIOutput *dxgi_output = NULL;
+    D3D_FEATURE_LEVEL feature_level;
+
+    hr = D3D11CreateDevice ((IDXGIAdapter *) dxgi_adapter1,
+        D3D_DRIVER_TYPE_UNKNOWN, NULL, 0,
+        feature_levels, G_N_ELEMENTS (feature_levels),
+        D3D11_SDK_VERSION, &self->d3d11_device, &feature_level,
+        &self->d3d11_context);
+    if (FAILED (hr)) {
+      HR_FAILED_INFO (hr, D3D11CreateDevice);
+      PTR_RELEASE (dxgi_adapter1);
+      continue;
+    }
+
+    for (j = 0; IDXGIAdapter1_EnumOutputs (dxgi_adapter1, j, &dxgi_output) !=
+        DXGI_ERROR_NOT_FOUND; ++j) {
+      DXGI_OUTPUT_DESC output_desc;
+      hr = IDXGIOutput_QueryInterface (dxgi_output, &IID_IDXGIOutput1,
+          (void **) &dxgi_output1);
+      PTR_RELEASE (dxgi_output);
+      HR_FAILED_GOTO (hr, IDXGIOutput::QueryInterface, new_error);
+
+      hr = IDXGIOutput1_GetDesc (dxgi_output1, &output_desc);
+      HR_FAILED_GOTO (hr, IDXGIOutput1::GetDesc, new_error);
+
+      if (output_desc.Monitor == monitor) {
+        GST_DEBUG_OBJECT (src, "found monitor");
+        break;
+      }
+
+      PTR_RELEASE (dxgi_output1);
+      dxgi_output1 = NULL;
+    }
+
+    PTR_RELEASE (dxgi_adapter1);
+
+    if (NULL != dxgi_output1) {
+      break;
+    }
+
+    PTR_RELEASE (self->d3d11_device);
+    PTR_RELEASE (self->d3d11_context);
+  }
+
+  if (NULL == dxgi_output1) {
+    goto new_error;
+  }
+
+  PTR_RELEASE (dxgi_factory1);
+
+  hr = IDXGIOutput1_DuplicateOutput (dxgi_output1,
+      (IUnknown *) (self->d3d11_device), &self->dxgi_dupl);
+  PTR_RELEASE (dxgi_output1);
+  HR_FAILED_GOTO (hr, IDXGIOutput1::DuplicateOutput, new_error);
+
+  IDXGIOutputDuplication_GetDesc (self->dxgi_dupl, &self->dupl_desc);
+  self->pointer_buffer_capacity = INITIAL_POINTER_BUFFER_CAPACITY;
+  self->pointer_buffer = g_malloc (self->pointer_buffer_capacity);
+  if (NULL == self->pointer_buffer) {
+    goto new_error;
+  }
+
+  self->move_rects_capacity = INITIAL_MOVE_RECTS_CAPACITY;
+  self->move_rects = g_new0 (DXGI_OUTDUPL_MOVE_RECT, self->move_rects_capacity);
+  if (NULL == self->move_rects) {
+    goto new_error;
+  }
+
+  self->dirty_rects_capacity = INITIAL_DIRTY_RECTS_CAPACITY;
+  self->dirty_rects = g_new0 (RECT, self->dirty_rects_capacity);
+  if (NULL == self->dirty_rects) {
+    goto new_error;
+  }
+
+  self->verteces_capacity = INITIAL_VERTICES_CAPACITY;
+  self->dirty_verteces = g_new0 (vertex, self->verteces_capacity);
+  if (NULL == self->dirty_verteces) {
+    goto new_error;
+  }
+
+  self->copy_rects_capacity = INITIAL_COPY_RECTS_CAPACITY;
+  self->copy_rects = g_new0 (RECT, self->copy_rects_capacity);
+  if (NULL == self->copy_rects) {
+    goto new_error;
+  }
+
+  if (DXGI_MODE_ROTATION_IDENTITY != self->dupl_desc.Rotation) {
+    /* For a rotated display, create a shader. */
+    hr = D3DCompile (STR_VERTEX_SHADER, sizeof (STR_VERTEX_SHADER),
+        NULL, NULL, NULL, "vs_main", "vs_4_0_level_9_1",
+        0, 0, &vertex_shader_blob, NULL);
+    HR_FAILED_GOTO (hr, D3DCompile, new_error);
+
+    hr = D3DCompile (STR_PIXEL_SHADER, sizeof (STR_PIXEL_SHADER),
+        NULL, NULL, NULL, "ps_main", "ps_4_0_level_9_1",
+        0, 0, &pixel_shader_blob, NULL);
+    HR_FAILED_GOTO (hr, D3DCompile, new_error);
+
+    hr = ID3D11Device_CreateVertexShader (self->d3d11_device,
+        ID3D10Blob_GetBufferPointer (vertex_shader_blob),
+        ID3D10Blob_GetBufferSize (vertex_shader_blob), NULL,
+        &self->vertex_shader);
+    HR_FAILED_GOTO (hr, ID3D11Device::CreateVertexShader, new_error);
+
+    hr = ID3D11Device_CreateInputLayout (self->d3d11_device, vertex_layout,
+        G_N_ELEMENTS (vertex_layout),
+        ID3D10Blob_GetBufferPointer (vertex_shader_blob),
+        ID3D10Blob_GetBufferSize (vertex_shader_blob), &vertex_input_layout);
+    PTR_RELEASE (vertex_shader_blob)
+        HR_FAILED_GOTO (hr, ID3D11Device::CreateInputLayout, new_error);
+
+    ID3D11DeviceContext_IASetInputLayout (self->d3d11_context,
+        vertex_input_layout);
+    PTR_RELEASE (vertex_input_layout);
+
+    hr = ID3D11Device_CreatePixelShader (self->d3d11_device,
+        ID3D10Blob_GetBufferPointer (pixel_shader_blob),
+        ID3D10Blob_GetBufferSize (pixel_shader_blob), NULL,
+        &self->pixel_shader);
+    PTR_RELEASE (pixel_shader_blob);
+    HR_FAILED_GOTO (hr, ID3D11Device::CreatePixelShader, new_error);
+
+    memset (&sampler_desc, 0, sizeof (sampler_desc));
+    sampler_desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
+    sampler_desc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
+    sampler_desc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
+    sampler_desc.AddressW = D3D11_TEXTURE_ADDRESS_CLAMP;
+    sampler_desc.ComparisonFunc = D3D11_COMPARISON_NEVER;
+    sampler_desc.MinLOD = 0;
+    sampler_desc.MaxLOD = D3D11_FLOAT32_MAX;
+
+    hr = ID3D11Device_CreateSamplerState (self->d3d11_device, &sampler_desc,
+        &self->sampler_state);
+    HR_FAILED_GOTO (hr, ID3D11Device::CreateSamplerState, new_error);
+  }
+
+  return self;
+
+new_error:
+  PTR_RELEASE (vertex_input_layout);
+  PTR_RELEASE (vertex_shader_blob);
+  PTR_RELEASE (pixel_shader_blob);
+
+  dxgicap_destory (self);
+  return NULL;
+}
+
+void
+dxgicap_destory (DxgiCapture * self)
+{
+  if (!self)
+    return;
+  PTR_RELEASE (self->target_view);
+  PTR_RELEASE (self->readable_texture);
+  PTR_RELEASE (self->work_texture);
+  PTR_RELEASE (self->dxgi_dupl);
+  PTR_RELEASE (self->d3d11_context);
+  PTR_RELEASE (self->d3d11_device);
+  PTR_RELEASE (self->vertex_shader);
+  PTR_RELEASE (self->pixel_shader);
+  PTR_RELEASE (self->sampler_state);
+
+  g_free (self->pointer_buffer);
+  g_free (self->move_rects);
+  g_free (self->dirty_rects);
+  g_free (self->dirty_verteces);
+  g_free (self->copy_rects);
+
+  g_free (self);
+}
+
+gboolean
+dxgicap_start (DxgiCapture * self)
+{
+  return _setup_texture (self);
+}
+
+void
+dxgicap_stop (DxgiCapture * self)
+{
+  PTR_RELEASE (self->target_view);
+  PTR_RELEASE (self->readable_texture);
+  PTR_RELEASE (self->work_texture);
+}
+
+gboolean
+dxgicap_acquire_next_frame (DxgiCapture * self, gboolean show_cursor,
+    guint timeout)
+{
+  gboolean ret = FALSE;
+  HRESULT hr;
+  GstDXGIScreenCapSrc *src = self->src;
+
+  DXGI_OUTDUPL_FRAME_INFO frame_info;
+  IDXGIResource *desktop_resource = NULL;
+
+  /* Get the latest desktop frames. */
+  hr = IDXGIOutputDuplication_AcquireNextFrame (self->dxgi_dupl,
+      timeout, &frame_info, &desktop_resource);
+  if (hr == DXGI_ERROR_WAIT_TIMEOUT) {
+    /* In case of DXGI_ERROR_WAIT_TIMEOUT, 
+     * it has not changed from the last time. */
+    GST_LOG_OBJECT (src, "DXGI_ERROR_WAIT_TIMEOUT");
+    ret = TRUE;
+    goto end;
+  }
+  HR_FAILED_GOTO (hr, IDXGIOutputDuplication::AcquireNextFrame, end);
+
+  if (0 != frame_info.LastPresentTime.QuadPart) {
+    /* The desktop frame has changed since last time. */
+    hr = _update_work_texture (self, desktop_resource);
+    if (FAILED (hr)) {
+      GST_DEBUG_OBJECT (src, "failed to _update_work_texture");
+      goto end;
+    }
+  }
+
+  if (show_cursor && 0 != frame_info.LastMouseUpdateTime.QuadPart) {
+    /* The mouse pointer has changed since last time. */
+    self->last_pointer_position = frame_info.PointerPosition;
+
+    if (0 < frame_info.PointerShapeBufferSize) {
+      /* A valid mouse cursor shape exists. */
+      DXGI_OUTDUPL_POINTER_SHAPE_INFO pointer_shape_info;
+      guint pointer_shape_size_required;
+      /* Get the mouse cursor shape. */
+      hr = IDXGIOutputDuplication_GetFramePointerShape (self->dxgi_dupl,
+          self->pointer_buffer_capacity,
+          self->pointer_buffer,
+          &pointer_shape_size_required, &pointer_shape_info);
+      if (DXGI_ERROR_MORE_DATA == hr) {
+        /* not enough buffers */
+        self->pointer_buffer_capacity = pointer_shape_size_required * 2;
+        self->pointer_buffer =
+            g_realloc (self->pointer_buffer, self->pointer_buffer_capacity);
+
+        hr = IDXGIOutputDuplication_GetFramePointerShape (self->dxgi_dupl,
+            self->pointer_buffer_capacity,
+            self->pointer_buffer,
+            &pointer_shape_size_required, &pointer_shape_info);
+      }
+      HR_FAILED_GOTO (hr, IDXGIOutputDuplication::GetFramePointerShape, end);
+      self->pointer_shape_info = pointer_shape_info;
+      ret = TRUE;
+    } else {
+      ret = TRUE;
+    }
+  } else {
+    ret = TRUE;
+  }
+end:
+  IDXGIOutputDuplication_ReleaseFrame (self->dxgi_dupl);
+  PTR_RELEASE (desktop_resource);
+  return ret;
+}
+
+gboolean
+dxgicap_copy_buffer (DxgiCapture * self, gboolean show_cursor, LPRECT dst_rect,
+    GstVideoInfo * video_info, GstBuffer * buf)
+{
+  HRESULT hr;
+  int i;
+  GstDXGIScreenCapSrc *src = self->src;
+  D3D11_MAPPED_SUBRESOURCE readable_map;
+  GstVideoFrame vframe;
+  gint height = RECT_HEIGHT ((*dst_rect));
+  gint width = RECT_WIDTH ((*dst_rect));
+
+  if (NULL == self->readable_texture) {
+    GST_DEBUG_OBJECT (src, "readable_texture is null");
+    goto flow_error;
+  }
+
+  hr = ID3D11DeviceContext_Map (self->d3d11_context,
+      (ID3D11Resource *) self->readable_texture, 0,
+      D3D11_MAP_READ, 0, &readable_map);
+  HR_FAILED_GOTO (hr, IDXGISurface1::Map, flow_error);
+  GST_DEBUG_OBJECT (src, "copy size width:%d height:%d", width, height);
+
+  /* Copy from readable_texture to GstVideFrame. */
+  if (gst_video_frame_map (&vframe, video_info, buf, GST_MAP_WRITE)) {
+    gint line_size;
+    gint stride_dst;
+    PBYTE frame_buffer;
+    PBYTE p_dst;
+    PBYTE p_src;
+
+    frame_buffer = GST_VIDEO_FRAME_PLANE_DATA (&vframe, 0);
+    p_src = (PBYTE) readable_map.pData +
+        (dst_rect->top * readable_map.RowPitch) +
+        (dst_rect->left * BYTE_PER_PIXEL);
+    p_dst = frame_buffer;
+
+    line_size = width * BYTE_PER_PIXEL;
+    stride_dst = GST_VIDEO_FRAME_PLANE_STRIDE (&vframe, 0);
+
+    if (line_size > stride_dst) {
+      GST_ERROR_OBJECT (src, "not enough stride in video frame");
+      ID3D11DeviceContext_Unmap (self->d3d11_context,
+          (ID3D11Resource *) self->readable_texture, 0);
+      gst_video_frame_unmap (&vframe);
+      goto flow_error;
+    }
+
+    for (i = 0; i < height; ++i) {
+      memcpy (p_dst, p_src, line_size);
+      p_dst += stride_dst;
+      p_src += readable_map.RowPitch;
+    }
+    ID3D11DeviceContext_Unmap (self->d3d11_context,
+        (ID3D11Resource *) self->readable_texture, 0);
+    HR_FAILED_GOTO (hr, IDXGISurface1::Unmap, flow_error);
+
+    if (show_cursor && self->last_pointer_position.Visible) {
+      _draw_pointer (self, frame_buffer, dst_rect, stride_dst);
+    }
+    gst_video_frame_unmap (&vframe);
+    return TRUE;
+  }
+
+flow_error:
+  return FALSE;
+}
+
+static void
+_draw_pointer (DxgiCapture * self, PBYTE buffer, LPRECT dst_rect, int stride)
+{
+  RECT pointer_rect;
+  RECT clip_pointer_rect;
+  int offset_x;
+  int offset_y;
+  PBYTE p_dst;
+  /* For DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MONOCHROME, halve the height. */
+  int pointer_height =
+      (DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MONOCHROME ==
+      self->pointer_shape_info.Type)
+      ? self->pointer_shape_info.Height / 2 : self->pointer_shape_info.Height;
+
+  /* A rectangular area containing the mouse pointer shape */
+  SetRect (&pointer_rect,
+      self->last_pointer_position.Position.x,
+      self->last_pointer_position.Position.y,
+      self->last_pointer_position.Position.x +
+      self->pointer_shape_info.Width,
+      self->last_pointer_position.Position.y + pointer_height);
+
+  if (!IntersectRect (&clip_pointer_rect, dst_rect, &pointer_rect)) {
+    return;
+  }
+
+  /* Draw a pointer if it overlaps the destination rectangle range. 
+   * There are three ways to draw the mouse cursor.
+   * see  https://docs.microsoft.com/ja-jp/windows/win32/api/dxgi1_2/ne-dxgi1_2-dxgi_outdupl_pointer_shape_type */
+  offset_x = clip_pointer_rect.left - pointer_rect.left;
+  offset_y = clip_pointer_rect.top - pointer_rect.top;
+  p_dst =
+      ((PBYTE) buffer) + ((clip_pointer_rect.top -
+          dst_rect->top) * stride) +
+      ((clip_pointer_rect.left - dst_rect->left) * BYTE_PER_PIXEL);
+
+  if (DXGI_OUTDUPL_POINTER_SHAPE_TYPE_COLOR ==
+      self->pointer_shape_info.Type
+      || DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MASKED_COLOR ==
+      self->pointer_shape_info.Type) {
+    gboolean mask_mode =
+        DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MASKED_COLOR ==
+        self->pointer_shape_info.Type;
+    PBYTE p_src =
+        (PBYTE) self->pointer_buffer +
+        (offset_y * self->pointer_shape_info.Pitch) +
+        (offset_x * BYTE_PER_PIXEL);
+
+    int y, x;
+    for (y = 0; y < RECT_HEIGHT (clip_pointer_rect); ++y) {
+      for (x = 0; x < RECT_WIDTH (clip_pointer_rect); ++x) {
+        PBYTE p1 = p_dst + (x * BYTE_PER_PIXEL);
+        PBYTE p2 = p_src + (x * BYTE_PER_PIXEL);
+        int alpha = *(p2 + 3);
+        int i;
+        for (i = 0; i < 3; ++i) {
+          if (mask_mode) {
+            /* case DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MASKED_COLOR: 
+             * If the alpha channel of a pixel in the mouse image is 0, copy it.
+             * Otherwise, xor each pixel. */
+            if (0 == alpha) {
+              *p1 = *p2;
+            } else {
+              *p1 = *p2 ^ *p1;
+            }
+          } else {
+            /* case DXGI_OUTDUPL_POINTER_SHAPE_TYPE_COLOR: 
+             * Copies the mouse cursor image with alpha channel composition. */
+            *p1 = min (255, max (0, *p1 + ((*p2 - *p1) * alpha / 255)));
+          }
+          ++p1;
+          ++p2;
+        }
+      }
+      p_dst += stride;
+      p_src += self->pointer_shape_info.Pitch;
+    }
+  } else if (DXGI_OUTDUPL_POINTER_SHAPE_TYPE_MONOCHROME ==
+      self->pointer_shape_info.Type) {
+    guint mask_bit = 0x80;
+    /* AND MASK pointer 
+     * It is stored in 1 bit per pixel from the beginning. */
+    PBYTE p_src_and =
+        (PBYTE) self->pointer_buffer +
+        (offset_y * self->pointer_shape_info.Pitch);
+    /* XOR MASK pointer 
+     * The XOR MASK is stored after the AND mask. */
+    PBYTE p_src_xor =
+        (PBYTE) self->pointer_buffer +
+        ((offset_y + pointer_height) * self->pointer_shape_info.Pitch);
+
+    int y, x;
+    for (y = 0; y < RECT_HEIGHT (clip_pointer_rect); ++y) {
+      guint32 *p_dst_32 = ((guint32 *) (p_dst));
+      for (x = offset_x; x < RECT_WIDTH (clip_pointer_rect); ++x) {
+        int bit_pos = x % 8;
+        gboolean and_bit =
+            0 != (*(p_src_and + (x / 8)) & (mask_bit >> bit_pos));
+        gboolean xor_bit =
+            0 != (*(p_src_xor + (x / 8)) & (mask_bit >> bit_pos));
+
+        if (and_bit) {
+          if (xor_bit) {
+            *p_dst_32 = *p_dst_32 ^ 0x00ffffff;
+          }
+        } else {
+          if (xor_bit) {
+            *p_dst_32 = 0xffffffff;
+          } else {
+            *p_dst_32 = 0xff000000;
+          }
+        }
+        ++p_dst_32;
+      }
+      p_dst += stride;
+      p_src_and += self->pointer_shape_info.Pitch;
+      p_src_xor += self->pointer_shape_info.Pitch;
+    }
+  }
+}
+
+static ID3D11Texture2D *
+_create_texture (DxgiCapture * self,
+    enum D3D11_USAGE usage, UINT bindFlags, UINT cpuAccessFlags)
+{
+  HRESULT hr;
+  GstDXGIScreenCapSrc *src = self->src;
+  D3D11_TEXTURE2D_DESC new_desc;
+  ID3D11Texture2D *new_texture = NULL;
+
+  ZeroMemory (&new_desc, sizeof (new_desc));
+  new_desc.Width = self->dupl_desc.ModeDesc.Width;
+  new_desc.Height = self->dupl_desc.ModeDesc.Height;
+  new_desc.MipLevels = 1;
+  new_desc.ArraySize = 1;
+  new_desc.SampleDesc.Count = 1;
+  new_desc.SampleDesc.Quality = 0;
+  new_desc.Usage = usage;
+  new_desc.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
+  new_desc.BindFlags = bindFlags;
+  new_desc.CPUAccessFlags = cpuAccessFlags;
+  new_desc.MiscFlags = 0;
+
+  hr = ID3D11Device_CreateTexture2D (self->d3d11_device, &new_desc, NULL,
+      &new_texture);
+  HR_FAILED_RET (hr, ID3D11Device::CreateTexture2D, NULL);
+
+  return new_texture;
+}
+
+static gboolean
+_setup_texture (DxgiCapture * self)
+{
+  HRESULT hr;
+  ID3D11Texture2D *new_texture = NULL;
+  GstDXGIScreenCapSrc *src = self->src;
+
+  if (NULL == self->readable_texture) {
+    new_texture = _create_texture (self, D3D11_USAGE_STAGING, 0,
+        D3D11_CPU_ACCESS_READ);
+    if (NULL == new_texture) {
+      return FALSE;
+    }
+    self->readable_texture = new_texture;
+  }
+
+  if (DXGI_MODE_ROTATION_IDENTITY != self->dupl_desc.Rotation) {
+    /* For rotated displays, create work_texture. */
+    if (NULL == self->work_texture) {
+      new_texture =
+          _create_texture (self, D3D11_USAGE_DEFAULT,
+          D3D11_BIND_RENDER_TARGET, 0);
+      if (NULL == new_texture) {
+        return FALSE;
+      }
+
+      self->work_texture = new_texture;
+      ID3D11Texture2D_GetDesc (self->work_texture, &self->work_texture_desc);
+      hr = ID3D11Device_CreateRenderTargetView (self->d3d11_device,
+          (ID3D11Resource *) self->work_texture, NULL, &self->target_view);
+      HR_FAILED_RET (hr, ID3D11Device::CreateRenderTargetView, FALSE);
+
+      self->view_port.Width = (float) self->work_texture_desc.Width;
+      self->view_port.Height = (float) self->work_texture_desc.Height;
+      self->view_port.MinDepth = 0.0f;
+      self->view_port.MaxDepth = 1.0f;
+      self->view_port.TopLeftX = 0.0f;
+      self->view_port.TopLeftY = 0.0f;
+    }
+  }
+
+  return TRUE;
+}
+
+/* Update work_texture to the latest desktop frame from the update information 
+ * that can be obtained from IDXGIOutputDuplication.
+ * Then copy to readable_texture.
+ */
+static HRESULT
+_update_work_texture (DxgiCapture * self, IDXGIResource * desktop_resource)
+{
+  HRESULT hr = S_OK;
+  GstDXGIScreenCapSrc *src = self->src;
+  int i;
+  ID3D11Texture2D *desktop_texture = NULL;
+  guint required_size;
+  guint move_count;
+  guint dirty_rects_capacity_size;
+  guint dirty_count;
+  guint copy_count;
+  D3D11_TEXTURE2D_DESC src_desc;
+  RECT *dst_rect;
+  ID3D11Texture2D *work_src;
+  guint move_rects_capacity_size =
+      sizeof (DXGI_OUTDUPL_MOVE_RECT) * self->move_rects_capacity;
+
+  hr = IDXGIResource_QueryInterface (desktop_resource, &IID_ID3D11Texture2D,
+      (void **) &desktop_texture);
+  HR_FAILED_GOTO (hr, IDXGIResource::QueryInterface, end);
+
+  /* Get the rectangular regions that was moved from the last time. 
+   * However, I have never obtained a valid value in GetFrameMoveRects.
+   * It seems to depend on the implementation of the GPU driver.
+   * see https://docs.microsoft.com/en-us/windows/win32/api/dxgi1_2/nf-dxgi1_2-idxgioutputduplication-getframemoverects
+   */
+  hr = IDXGIOutputDuplication_GetFrameMoveRects (self->dxgi_dupl,
+      move_rects_capacity_size, self->move_rects, &required_size);
+  if (DXGI_ERROR_MORE_DATA == hr) {
+    /* not enough buffers */
+    self->move_rects_capacity =
+        (required_size / sizeof (DXGI_OUTDUPL_MOVE_RECT)) * 2;
+    self->move_rects =
+        g_renew (DXGI_OUTDUPL_MOVE_RECT, self->move_rects,
+        self->move_rects_capacity);
+
+    hr = IDXGIOutputDuplication_GetFrameMoveRects (self->dxgi_dupl,
+        required_size, self->move_rects, &required_size);
+  }
+  HR_FAILED_GOTO (hr, IDXGIOutputDuplication::GetFrameMoveRects, end);
+  move_count = required_size / sizeof (DXGI_OUTDUPL_MOVE_RECT);
+
+  dirty_rects_capacity_size = sizeof (RECT) * self->dirty_rects_capacity;
+  /* Gets the rectangular regions that has changed since the last time. 
+     see https://docs.microsoft.com/en-us/windows/win32/api/dxgi1_2/nf-dxgi1_2-idxgioutputduplication-getframedirtyrects 
+   */
+  hr = IDXGIOutputDuplication_GetFrameDirtyRects (self->dxgi_dupl,
+      dirty_rects_capacity_size, self->dirty_rects, &required_size);
+
+  if (DXGI_ERROR_MORE_DATA == hr) {
+    /* not enough buffers */
+    self->dirty_rects_capacity = (required_size / sizeof (RECT)) * 2;
+    self->dirty_rects =
+        g_renew (RECT, self->dirty_rects, self->dirty_rects_capacity);
+
+    hr = IDXGIOutputDuplication_GetFrameDirtyRects (self->dxgi_dupl,
+        required_size, self->dirty_rects, &required_size);
+  }
+  HR_FAILED_GOTO (hr, IDXGIOutputDuplication::GetFrameDirtyRects, end);
+
+  dirty_count = required_size / sizeof (RECT);
+
+  /* The number of rectangular regions to copy to the readable_texture. */
+  copy_count = move_count + dirty_count;
+
+  if (self->copy_rects_capacity < copy_count) {
+    /* not enough buffers */
+    self->copy_rects_capacity = copy_count * 2;
+    self->copy_rects =
+        g_renew (RECT, self->copy_rects, self->copy_rects_capacity);
+  }
+
+  if (DXGI_MODE_ROTATION_IDENTITY == self->dupl_desc.Rotation) {
+    /* For a non-rotating display, copy it directly into readable_texture. */
+    RECT *p = self->copy_rects;
+    for (i = 0; i < move_count; ++i) {
+      *p = self->move_rects[i].DestinationRect;
+      ++p;
+    }
+    for (i = 0; i < dirty_count; ++i) {
+      *p = self->dirty_rects[i];
+      ++p;
+    }
+    work_src = desktop_texture;
+  } else {
+    /* For rotated displays, rotate to work_texture and copy. */
+    ID3D11Texture2D_GetDesc (desktop_texture, &src_desc);
+    dst_rect = self->copy_rects;
+    /* Copy the dirty rectangular and moved rectangular regions from desktop frame to work_texture. */
+    hr = _copy_dirty_fragment (self, desktop_texture, &src_desc, move_count,
+        dirty_count, &dst_rect);
+    work_src = self->work_texture;
+    if (FAILED (hr)) {
+      goto end;
+    }
+  }
+
+  /* Copy the updated rectangular regions to readable_texture. */
+  for (i = 0; i < copy_count; ++i) {
+    RECT *p = (self->copy_rects + i);
+    D3D11_BOX box;
+    box.left = p->left;
+    box.top = p->top;
+    box.front = 0;
+    box.right = p->right;
+    box.bottom = p->bottom;
+    box.back = 1;
+
+    ID3D11DeviceContext_CopySubresourceRegion (self->d3d11_context,
+        (ID3D11Resource *) self->readable_texture,
+        0, p->left, p->top, 0, (ID3D11Resource *) work_src, 0, &box);
+  }
+
+end:
+  PTR_RELEASE (desktop_texture);
+  return hr;
+}
+
+static void
+_rotate_rect (DXGI_MODE_ROTATION rotation, RECT * dst, const RECT * src,
+    gint dst_width, gint dst_height)
+{
+  switch (rotation) {
+    case DXGI_MODE_ROTATION_ROTATE90:
+      dst->left = dst_width - src->bottom;
+      dst->top = src->left;
+      dst->right = dst_width - src->top;
+      dst->bottom = src->right;
+      break;
+    case DXGI_MODE_ROTATION_ROTATE180:
+      dst->left = dst_width - src->right;
+      dst->top = dst_height - src->bottom;
+      dst->right = dst_width - src->left;
+      dst->bottom = dst_height - src->top;
+      break;
+    case DXGI_MODE_ROTATION_ROTATE270:
+      dst->left = src->top;
+      dst->top = dst_height - src->right;
+      dst->right = src->bottom;
+      dst->bottom = dst_height - src->left;
+      break;
+    default:
+      *dst = *src;
+      break;
+  }
+}
+
+/* Copy the rectangular area specified by dirty_rects and move_rects from src_texture to work_texture. */
+static HRESULT
+_copy_dirty_fragment (DxgiCapture * self, ID3D11Texture2D * src_texture,
+    const D3D11_TEXTURE2D_DESC * src_desc, guint move_count, guint dirty_count,
+    RECT ** dst_rect)
+{
+  HRESULT hr = S_OK;
+  GstDXGIScreenCapSrc *src = self->src;
+  int i;
+  RECT *dst_rect_p;
+  vertex *vp;
+  UINT stride;
+  UINT offset;
+  guint verteces_count;
+  ID3D11Buffer *verteces_buffer = NULL;
+  ID3D11ShaderResourceView *shader_resource = NULL;
+  D3D11_SUBRESOURCE_DATA subresource_data;
+  D3D11_BUFFER_DESC buffer_desc;
+  D3D11_SHADER_RESOURCE_VIEW_DESC shader_desc;
+
+  shader_desc.Format = src_desc->Format;
+  shader_desc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
+  shader_desc.Texture2D.MostDetailedMip = src_desc->MipLevels - 1;
+  shader_desc.Texture2D.MipLevels = src_desc->MipLevels;
+  hr = ID3D11Device_CreateShaderResourceView (self->d3d11_device,
+      (ID3D11Resource *) src_texture, &shader_desc, &shader_resource);
+  HR_FAILED_GOTO (hr, ID3D11Device::CreateShaderResourceView, end);
+
+  ID3D11DeviceContext_OMSetRenderTargets (self->d3d11_context, 1,
+      &self->target_view, NULL);
+
+  ID3D11DeviceContext_VSSetShader (self->d3d11_context, self->vertex_shader,
+      NULL, 0);
+
+  ID3D11DeviceContext_PSSetShader (self->d3d11_context, self->pixel_shader,
+      NULL, 0);
+
+  ID3D11DeviceContext_PSSetShaderResources (self->d3d11_context, 0, 1,
+      &shader_resource);
+
+  ID3D11DeviceContext_PSSetSamplers (self->d3d11_context, 0, 1,
+      &self->sampler_state);
+
+  ID3D11DeviceContext_IASetPrimitiveTopology (self->d3d11_context,
+      D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+
+  verteces_count = (move_count + dirty_count) * VERTEX_NUM;
+  if (verteces_count > self->verteces_capacity) {
+    /* not enough buffers */
+    self->verteces_capacity = verteces_count * 2;
+    self->dirty_verteces =
+        g_renew (vertex, self->dirty_verteces, self->verteces_capacity);
+    if (NULL == self->dirty_verteces) {
+      hr = S_FALSE;
+      goto end;
+    }
+  }
+
+  dst_rect_p = *dst_rect;
+  vp = self->dirty_verteces;
+  /* Create a vertex buffer to move and rotate from the move_rects.
+   * And set the rectangular region to be copied to readable_texture. */
+  for (i = 0; i < move_count; ++i) {
+    /* Copy the area to be moved. 
+     * The source of the move is included in dirty_rects. */
+    _set_verteces (self, vp, dst_rect_p, &self->work_texture_desc,
+        &(self->move_rects[i].DestinationRect), src_desc);
+    vp += VERTEX_NUM;
+    ++dst_rect_p;
+  }
+  /* Create a vertex buffer to move and rotate from the dirty_rects.
+   * And set the rectangular region to be copied to readable_texture. */
+  for (i = 0; i < dirty_count; ++i) {
+    _set_verteces (self, vp, dst_rect_p, &self->work_texture_desc,
+        &(self->dirty_rects[i]), src_desc);
+    vp += VERTEX_NUM;
+    ++dst_rect_p;
+  }
+  *dst_rect = dst_rect_p;
+
+  memset (&buffer_desc, 0, sizeof (buffer_desc));
+  buffer_desc.Usage = D3D11_USAGE_IMMUTABLE;
+  buffer_desc.ByteWidth = verteces_count * sizeof (vertex);
+  buffer_desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+  buffer_desc.CPUAccessFlags = 0;
+
+  memset (&subresource_data, 0, sizeof (subresource_data));
+  subresource_data.pSysMem = self->dirty_verteces;
+
+  hr = ID3D11Device_CreateBuffer (self->d3d11_device, &buffer_desc,
+      &subresource_data, &verteces_buffer);
+  HR_FAILED_GOTO (hr, ID3D11Device::CreateBuffer, end);
+
+  stride = sizeof (vertex);
+  offset = 0;
+  ID3D11DeviceContext_IASetVertexBuffers (self->d3d11_context, 0, 1,
+      &verteces_buffer, &stride, &offset);
+
+  ID3D11DeviceContext_RSSetViewports (self->d3d11_context, 1, &self->view_port);
+
+  /* Copy the rectangular region indicated by dirty_rects from the desktop frame to work_texture. */
+  ID3D11DeviceContext_Draw (self->d3d11_context, verteces_count, 0);
+
+end:
+  PTR_RELEASE (verteces_buffer);
+  PTR_RELEASE (shader_resource);
+
+  return hr;
+}
+
+static void
+_set_verteces (DxgiCapture * self, vertex * verteces, RECT * dst_rect,
+    const D3D11_TEXTURE2D_DESC * dst_desc, RECT * rect,
+    const D3D11_TEXTURE2D_DESC * src_desc)
+{
+  int center_x;
+  int center_y;
+
+  /* Rectangular area is moved according to the rotation of the display. */
+  _rotate_rect (self->dupl_desc.Rotation, dst_rect, rect, dst_desc->Width,
+      dst_desc->Height);
+
+  /* Set the vertex buffer from the rotation of the display. */
+  switch (self->dupl_desc.Rotation) {
+    case DXGI_MODE_ROTATION_ROTATE90:
+    verteces[0].texcoord = (vector2d) {
+    (float) rect->right / (float) src_desc->Width,
+          (float) rect->bottom / (float) src_desc->Height};
+      verteces[1].texcoord = (vector2d) {
+      (float) rect->left / (float) src_desc->Width,
+            (float) rect->bottom / (float) src_desc->Height};
+      verteces[2].texcoord = (vector2d) {
+      (float) rect->right / (float) src_desc->Width,
+            (float) rect->top / (float) src_desc->Height};
+      verteces[5].texcoord = (vector2d) {
+      (float) rect->left / (float) src_desc->Width,
+            (float) rect->top / (float) src_desc->Height};
+      break;
+    case DXGI_MODE_ROTATION_ROTATE180:
+    verteces[0].texcoord = (vector2d) {
+    (float) rect->right / (float) src_desc->Width,
+          (float) rect->top / (float) src_desc->Height};
+      verteces[1].texcoord = (vector2d) {
+      (float) rect->right / (float) src_desc->Width,
+            (float) rect->bottom / (float) src_desc->Height};
+      verteces[2].texcoord = (vector2d) {
+      (float) rect->left / (float) src_desc->Width,
+            (float) rect->top / (float) src_desc->Height};
+      verteces[5].texcoord = (vector2d) {
+      (float) rect->left / (float) src_desc->Width,
+            (float) rect->bottom / (float) src_desc->Height};
+      break;
+    case DXGI_MODE_ROTATION_ROTATE270:
+    verteces[0].texcoord = (vector2d) {
+    (float) rect->left / (float) src_desc->Width,
+          (float) rect->top / (float) src_desc->Height};
+      verteces[1].texcoord = (vector2d) {
+      (float) rect->right / (float) src_desc->Width,
+            (float) rect->top / (float) src_desc->Height};
+      verteces[2].texcoord = (vector2d) {
+      (float) rect->left / (float) src_desc->Width,
+            (float) rect->bottom / (float) src_desc->Height};
+      verteces[5].texcoord = (vector2d) {
+      (float) rect->right / (float) src_desc->Width,
+            (float) rect->bottom / (float) src_desc->Height};
+      break;
+    default:
+    verteces[0].texcoord = (vector2d) {
+    (float) rect->left / (float) src_desc->Width,
+          (float) rect->bottom / (float) src_desc->Height};
+      verteces[1].texcoord = (vector2d) {
+      (float) rect->left / (float) src_desc->Width,
+            (float) rect->top / (float) src_desc->Height};
+      verteces[2].texcoord = (vector2d) {
+      (float) rect->right / (float) src_desc->Width,
+            (float) rect->bottom / (float) src_desc->Height};
+      verteces[5].texcoord = (vector2d) {
+      (float) rect->right / (float) src_desc->Width,
+            (float) rect->top / (float) src_desc->Height};
+      break;
+  }
+  verteces[3].texcoord = verteces[2].texcoord;
+  verteces[4].texcoord = verteces[1].texcoord;
+
+  center_x = (int) dst_desc->Width / 2;
+  center_y = (int) dst_desc->Height / 2;
+
+  verteces[0].pos = (vector3d) {
+  (float) (dst_rect->left - center_x) / (float) center_x,
+        (float) (dst_rect->bottom - center_y) / (float) center_y *-1.0f, 0.0f};
+  verteces[1].pos = (vector3d) {
+  (float) (dst_rect->left - center_x) / (float) center_x,
+        (float) (dst_rect->top - center_y) / (float) center_y *-1.0f, 0.0f};
+  verteces[2].pos = (vector3d) {
+  (float) (dst_rect->right - center_x) / (float) center_x,
+        (float) (dst_rect->bottom - center_y) / (float) center_y *-1.0f, 0.0f};
+  verteces[3].pos = verteces[2].pos;
+  verteces[4].pos = verteces[1].pos;
+  verteces[5].pos = (vector3d) {
+  (float) (dst_rect->right - center_x) / (float) center_x,
+        (float) (dst_rect->top - center_y) / (float) center_y *-1.0f, 0.0f};
+}
+
+typedef struct _monitor_param_by_name
+{
+  const gchar *device_name;
+  HMONITOR hmonitor;
+} monitor_param_by_name;
+
+static BOOL CALLBACK
+monitor_enum_proc_by_name (HMONITOR hmonitor, HDC hdc, LPRECT rect,
+    LPARAM lparam)
+{
+  MONITORINFOEXA monitor_info;
+  monitor_param_by_name *param = (monitor_param_by_name *) lparam;
+
+  monitor_info.cbSize = sizeof (monitor_info);
+  if (GetMonitorInfoA (hmonitor, (MONITORINFO *) & monitor_info)) {
+    if (0 == g_strcmp0 (monitor_info.szDevice, param->device_name)) {
+      param->hmonitor = hmonitor;
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+
+HMONITOR
+get_hmonitor_by_device_name (const gchar * device_name)
+{
+  monitor_param_by_name monitor = { device_name, NULL, };
+  EnumDisplayMonitors (NULL, NULL, monitor_enum_proc_by_name,
+      (LPARAM) & monitor);
+  return monitor.hmonitor;
+}
+
+static BOOL CALLBACK
+monitor_enum_proc_primary (HMONITOR hmonitor, HDC hdc, LPRECT rect,
+    LPARAM lparam)
+{
+  MONITORINFOEXA monitor_info;
+  monitor_param_by_name *param = (monitor_param_by_name *) lparam;
+
+  monitor_info.cbSize = sizeof (monitor_info);
+  if (GetMonitorInfoA (hmonitor, (MONITORINFO *) & monitor_info)) {
+    if (MONITORINFOF_PRIMARY == monitor_info.dwFlags) {
+      param->hmonitor = hmonitor;
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+
+HMONITOR
+get_hmonitor_primary (void)
+{
+  monitor_param_by_name monitor = { NULL, NULL, };
+  EnumDisplayMonitors (NULL, NULL, monitor_enum_proc_primary,
+      (LPARAM) & monitor);
+  return monitor.hmonitor;
+}
+
+typedef struct _monitor_param_by_index
+{
+  int target;
+  int counter;
+  HMONITOR hmonitor;
+} monitor_param_by_index;
+
+static BOOL CALLBACK
+monitor_enum_proc_by_index (HMONITOR hmonitor, HDC hdc, LPRECT rect,
+    LPARAM lparam)
+{
+  MONITORINFOEXA monitor_info;
+  monitor_param_by_index *param = (monitor_param_by_index *) lparam;
+
+  monitor_info.cbSize = sizeof (monitor_info);
+  if (GetMonitorInfoA (hmonitor, (MONITORINFO *) & monitor_info)) {
+    if (param->target == param->counter) {
+      param->hmonitor = hmonitor;
+      return FALSE;
+    }
+  }
+  ++param->counter;
+  return TRUE;
+}
+
+HMONITOR
+get_hmonitor_by_index (int index)
+{
+  monitor_param_by_index monitor = { index, 0, NULL, };
+  EnumDisplayMonitors (NULL, NULL, monitor_enum_proc_by_index,
+      (LPARAM) & monitor);
+  return monitor.hmonitor;
+}
+
+
+gboolean
+get_monitor_physical_size (HMONITOR hmonitor, LPRECT rect)
+{
+  MONITORINFOEXW monitor_info;
+  DEVMODEW dev_mode;
+
+  monitor_info.cbSize = sizeof (monitor_info);
+  if (!GetMonitorInfoW (hmonitor, (LPMONITORINFO) & monitor_info)) {
+    return FALSE;
+  }
+
+  dev_mode.dmSize = sizeof (dev_mode);
+  dev_mode.dmDriverExtra = sizeof (POINTL);
+  dev_mode.dmFields = DM_POSITION;
+  if (!EnumDisplaySettingsW
+      (monitor_info.szDevice, ENUM_CURRENT_SETTINGS, &dev_mode)) {
+    return FALSE;
+  }
+
+  SetRect (rect, 0, 0, dev_mode.dmPelsWidth, dev_mode.dmPelsHeight);
+  return TRUE;
+}
+
+static const gchar *
+_hresult_to_string_fallback (HRESULT hr)
+{
+  const gchar *s = "unknown error";
+
+  switch (hr) {
+    case DXGI_ERROR_ACCESS_DENIED:
+      s = "DXGI_ERROR_ACCESS_DENIED";
+      break;
+    case DXGI_ERROR_ACCESS_LOST:
+      s = "DXGI_ERROR_ACCESS_LOST";
+      break;
+    case DXGI_ERROR_CANNOT_PROTECT_CONTENT:
+      s = "DXGI_ERROR_CANNOT_PROTECT_CONTENT";
+      break;
+    case DXGI_ERROR_DEVICE_HUNG:
+      s = "DXGI_ERROR_DEVICE_HUNG";
+      break;
+    case DXGI_ERROR_DEVICE_REMOVED:
+      s = "DXGI_ERROR_DEVICE_REMOVED";
+      break;
+    case DXGI_ERROR_DEVICE_RESET:
+      s = "DXGI_ERROR_DEVICE_RESET";
+      break;
+    case DXGI_ERROR_DRIVER_INTERNAL_ERROR:
+      s = "DXGI_ERROR_DRIVER_INTERNAL_ERROR";
+      break;
+    case DXGI_ERROR_FRAME_STATISTICS_DISJOINT:
+      s = "DXGI_ERROR_FRAME_STATISTICS_DISJOINT";
+      break;
+    case DXGI_ERROR_GRAPHICS_VIDPN_SOURCE_IN_USE:
+      s = "DXGI_ERROR_GRAPHICS_VIDPN_SOURCE_IN_USE";
+      break;
+    case DXGI_ERROR_INVALID_CALL:
+      s = "DXGI_ERROR_INVALID_CALL";
+      break;
+    case DXGI_ERROR_MORE_DATA:
+      s = "DXGI_ERROR_MORE_DATA";
+      break;
+    case DXGI_ERROR_NAME_ALREADY_EXISTS:
+      s = "DXGI_ERROR_NAME_ALREADY_EXISTS";
+      break;
+    case DXGI_ERROR_NONEXCLUSIVE:
+      s = "DXGI_ERROR_NONEXCLUSIVE";
+      break;
+    case DXGI_ERROR_NOT_CURRENTLY_AVAILABLE:
+      s = "DXGI_ERROR_NOT_CURRENTLY_AVAILABLE";
+      break;
+    case DXGI_ERROR_NOT_FOUND:
+      s = "DXGI_ERROR_NOT_FOUND";
+      break;
+    case DXGI_ERROR_REMOTE_CLIENT_DISCONNECTED:
+      s = "DXGI_ERROR_REMOTE_CLIENT_DISCONNECTED";
+      break;
+    case DXGI_ERROR_REMOTE_OUTOFMEMORY:
+      s = "DXGI_ERROR_REMOTE_OUTOFMEMORY";
+      break;
+    case DXGI_ERROR_RESTRICT_TO_OUTPUT_STALE:
+      s = "DXGI_ERROR_RESTRICT_TO_OUTPUT_STALE";
+      break;
+    case DXGI_ERROR_SDK_COMPONENT_MISSING:
+      s = "DXGI_ERROR_SDK_COMPONENT_MISSING";
+      break;
+    case DXGI_ERROR_SESSION_DISCONNECTED:
+      s = "DXGI_ERROR_SESSION_DISCONNECTED";
+      break;
+    case DXGI_ERROR_UNSUPPORTED:
+      s = "DXGI_ERROR_UNSUPPORTED";
+      break;
+    case DXGI_ERROR_WAIT_TIMEOUT:
+      s = "DXGI_ERROR_WAIT_TIMEOUT";
+      break;
+    case DXGI_ERROR_WAS_STILL_DRAWING:
+      s = "DXGI_ERROR_WAS_STILL_DRAWING";
+      break;
+    case E_FAIL:
+      s = "E_FAIL";
+      break;
+    case E_OUTOFMEMORY:
+      s = "E_OUTOFMEMORY";
+      break;
+    case E_NOTIMPL:
+      s = "E_NOTIMPL";
+      break;
+    case E_ACCESSDENIED:
+      s = "E_ACCESSDENIED";
+      break;
+    case E_POINTER:
+      s = "E_POINTER";
+      break;
+    case E_INVALIDARG:
+      s = "E_INVALIDARG";
+      break;
+#if defined(_MSC_VER) && (_MSC_VER >= 1800)
+    case DXGI_ERROR_ALREADY_EXISTS:
+      s = "DXGI_ERROR_ALREADY_EXISTS";
+      break;
+    case D3D11_ERROR_FILE_NOT_FOUND:
+      s = "D3D11_ERROR_FILE_NOT_FOUND";
+      break;
+    case D3D11_ERROR_TOO_MANY_UNIQUE_STATE_OBJECTS:
+      s = "D3D11_ERROR_TOO_MANY_UNIQUE_STATE_OBJECTS";
+      break;
+    case D3D11_ERROR_TOO_MANY_UNIQUE_VIEW_OBJECTS:
+      s = "D3D11_ERROR_TOO_MANY_UNIQUE_VIEW_OBJECTS";
+      break;
+    case D3D11_ERROR_DEFERRED_CONTEXT_MAP_WITHOUT_INITIAL_DISCARD:
+      s = "D3D11_ERROR_DEFERRED_CONTEXT_MAP_WITHOUT_INITIAL_DISCARD";
+      break;
+#endif
+  }
+  return s;
+}
+
+gchar *
+get_hresult_to_string (HRESULT hr)
+{
+  DWORD flags;
+  gchar *ret_text;
+  LPTSTR error_text = NULL;
+
+  flags = FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER
+      | FORMAT_MESSAGE_IGNORE_INSERTS;
+  FormatMessage (flags, NULL, hr, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
+      (LPTSTR) & error_text, 0, NULL);
+
+  /* If we couldn't get the error msg, try the fallback switch statement */
+  if (error_text == NULL)
+    return g_strdup (_hresult_to_string_fallback (hr));
+
+#ifdef UNICODE
+  /* If UNICODE is defined, LPTSTR is LPWSTR which is UTF-16 */
+  ret_text = g_utf16_to_utf8 (error_text, 0, NULL, NULL, NULL);
+#else
+  ret_text = g_strdup (error_text);
+#endif
+
+  LocalFree (error_text);
+  return ret_text;
+}
diff --git a/sys/winscreencap/dxgicapture.h b/sys/winscreencap/dxgicapture.h
new file mode 100644
index 000000000..2f6c5204e
--- /dev/null
+++ b/sys/winscreencap/dxgicapture.h
@@ -0,0 +1,83 @@
+/* GStreamer
+ * Copyright (C) 2019 OKADA Jun-ichi <okada@abt.jp>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __DXGICAP_H__
+#define __DXGICAP_H__
+
+#define COBJMACROS
+#include <d3d11.h>
+#include <dxgi.h>
+#include <dxgi1_2.h>
+#undef COBJMACROS
+
+#include <gst/gst.h>
+#include <gst/base/gstpushsrc.h>
+#include <gst/video/video.h>
+
+#define RECT_WIDTH(r) (r.right - r.left)
+#define RECT_HEIGHT(r) (r.bottom - r.top)
+
+#define HR_FAILED_AND(hr,func,and) \
+  G_STMT_START { \
+    if (FAILED (hr)) { \
+      gchar *msg = get_hresult_to_string (hr); \
+      GST_ERROR_OBJECT (src, #func " failed (%x): %s", (guint) hr, msg); \
+      g_free (msg); \
+      and; \
+    } \
+  } G_STMT_END
+
+#define HR_FAILED_RET(hr,func,ret) HR_FAILED_AND(hr,func,return ret)
+
+#define HR_FAILED_GOTO(hr,func,where) HR_FAILED_AND(hr,func,goto where)
+
+#define HR_FAILED_INFO(hr, func) \
+  G_STMT_START { \
+    if (FAILED (hr)) { \
+      gchar *msg = get_hresult_to_string (hr); \
+      GST_INFO_OBJECT (src, #func " failed (%x): %s", (guint) hr, msg); \
+      g_free (msg); \
+    } \
+  } G_STMT_END
+
+
+typedef struct _GstDXGIScreenCapSrc GstDXGIScreenCapSrc;
+
+typedef struct _DxgiCapture DxgiCapture;
+
+DxgiCapture *dxgicap_new (HMONITOR monitor, GstDXGIScreenCapSrc * src);
+void dxgicap_destory (DxgiCapture * _this);
+
+gboolean dxgicap_start (DxgiCapture * _this);
+void dxgicap_stop (DxgiCapture * _this);
+
+gint dxgicap_acquire_next_frame (DxgiCapture * _this, gboolean show_cursor,
+    guint timeout);
+gboolean dxgicap_copy_buffer (DxgiCapture * _this, gboolean show_cursor,
+    LPRECT src_rect, GstVideoInfo * video_info, GstBuffer * buf);
+
+HMONITOR get_hmonitor_by_device_name (const gchar * device_name);
+HMONITOR get_hmonitor_primary (void);
+HMONITOR get_hmonitor_by_index (int index);
+
+gboolean get_monitor_physical_size (HMONITOR hmonitor, LPRECT rect);
+
+gchar *get_hresult_to_string (HRESULT hr);
+
+#endif /* __DXGICAP_H__ */
diff --git a/sys/winscreencap/gstdxgiscreencapsrc.c b/sys/winscreencap/gstdxgiscreencapsrc.c
new file mode 100644
index 000000000..e6e4870e8
--- /dev/null
+++ b/sys/winscreencap/gstdxgiscreencapsrc.c
@@ -0,0 +1,564 @@
+/* GStreamer
+ * Copyright (C) 2019 OKADA Jun-ichi <okada@abt.jp>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+/**
+ * SECTION:element-dxgiscreencapsrc
+ * @title: dxgiscreencapsrc
+ *
+ * This element uses DXGI Desktop Duplication API.
+ * The default is capturing the whole desktop, but #GstDXGIScreenCapSrc:x,
+ * #GstDXGIScreenCapSrc:y, #GstDXGIScreenCapSrc:width and
+ * #GstDXGIScreenCapSrc:height can be used to select a particular region.
+ * Use #GstDXGIScreenCapSrc:monitor for changing which monitor to capture
+ * from.
+ *
+ * ## Example pipelines
+ * |[
+ * gst-launch-1.0 dxgiscreencapsrc ! videoconvert ! dshowvideosink
+ * ]| Capture the desktop and display it.
+ * |[
+ * gst-launch-1.0 dxgiscreencapsrc x=100 y=100 width=320 height=240 !
+ * videoconvert ! dshowvideosink
+ * ]| Capture a portion of the desktop and display it.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/video/video.h>
+#include "gstdxgiscreencapsrc.h"
+#include "dxgicapture.h"
+
+GST_DEBUG_CATEGORY_STATIC (dxgiscreencapsrc_debug);
+
+struct _GstDXGIScreenCapSrc
+{
+  /* Parent */
+  GstPushSrc src;
+
+  /* Properties */
+  gint capture_x;
+  gint capture_y;
+  gint capture_w;
+  gint capture_h;
+  guint monitor;
+  gchar *device_name;
+  gboolean show_cursor;
+
+  /* Source pad frame rate */
+  gint rate_numerator;
+  gint rate_denominator;
+
+  /* Runtime variables */
+  RECT screen_rect;
+  RECT src_rect;
+  guint64 frame_number;
+  GstClockID clock_id;
+  GstVideoInfo video_info;
+
+  /*DXGI capture */
+  DxgiCapture *dxgi_capture;
+};
+
+static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGRA")));
+
+#define gst_dxgi_screen_cap_src_parent_class parent_class
+G_DEFINE_TYPE (GstDXGIScreenCapSrc, gst_dxgi_screen_cap_src, GST_TYPE_PUSH_SRC);
+
+#define DEFAULT_MONITOR (-1)
+#define DEFAULT_DEVICE_NAME (NULL)
+#define DEFAULT_SHOW_CURSOR (FALSE)
+#define DEFAULT_X_POS (0)
+#define DEFAULT_Y_POS (0)
+#define DEFAULT_WIDTH (0)
+#define DEFAULT_HEIGHT (0)
+
+enum
+{
+  PROP_0,
+  PROP_MONITOR,
+  PROP_DEVICE_NAME,
+  PROP_SHOW_CURSOR,
+  PROP_X_POS,
+  PROP_Y_POS,
+  PROP_WIDTH,
+  PROP_HEIGHT
+};
+
+static void gst_dxgi_screen_cap_src_dispose (GObject * object);
+static void gst_dxgi_screen_cap_src_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_dxgi_screen_cap_src_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+
+static GstCaps *gst_dxgi_screen_cap_src_fixate (GstBaseSrc * bsrc,
+    GstCaps * caps);
+static gboolean gst_dxgi_screen_cap_src_set_caps (GstBaseSrc * bsrc,
+    GstCaps * caps);
+static GstCaps *gst_dxgi_screen_cap_src_get_caps (GstBaseSrc * bsrc,
+    GstCaps * filter);
+static gboolean gst_dxgi_screen_cap_src_start (GstBaseSrc * bsrc);
+static gboolean gst_dxgi_screen_cap_src_stop (GstBaseSrc * bsrc);
+
+static gboolean gst_dxgi_screen_cap_src_unlock (GstBaseSrc * bsrc);
+
+static GstFlowReturn gst_dxgi_screen_cap_src_fill (GstPushSrc * pushsrc,
+    GstBuffer * buffer);
+
+
+static HMONITOR _get_hmonitor (GstDXGIScreenCapSrc * src);
+
+/* Implementation. */
+static void
+gst_dxgi_screen_cap_src_class_init (GstDXGIScreenCapSrcClass * klass)
+{
+  GObjectClass *go_class;
+  GstElementClass *e_class;
+  GstBaseSrcClass *bs_class;
+  GstPushSrcClass *ps_class;
+
+  go_class = G_OBJECT_CLASS (klass);
+  e_class = GST_ELEMENT_CLASS (klass);
+  bs_class = GST_BASE_SRC_CLASS (klass);
+  ps_class = GST_PUSH_SRC_CLASS (klass);
+
+  go_class->set_property = gst_dxgi_screen_cap_src_set_property;
+  go_class->get_property = gst_dxgi_screen_cap_src_get_property;
+
+  go_class->dispose = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_dispose);
+  bs_class->get_caps = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_get_caps);
+  bs_class->set_caps = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_set_caps);
+  bs_class->start = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_start);
+  bs_class->stop = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_stop);
+  bs_class->unlock = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_unlock);
+  bs_class->fixate = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_fixate);
+  ps_class->fill = GST_DEBUG_FUNCPTR (gst_dxgi_screen_cap_src_fill);
+
+  g_object_class_install_property (go_class, PROP_MONITOR,
+      g_param_spec_int ("monitor", "Monitor",
+          "Which monitor to use (-1 = primary monitor and default)",
+          DEFAULT_MONITOR, G_MAXINT, DEFAULT_MONITOR, G_PARAM_READWRITE));
+  g_object_class_install_property (go_class, PROP_DEVICE_NAME,
+      g_param_spec_string ("device-name", "Monitor device name",
+          "Which monitor to use by device name (e.g. \"\\\\\\\\.\\\\DISPLAY1\")",
+          DEFAULT_DEVICE_NAME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (go_class, PROP_SHOW_CURSOR,
+      g_param_spec_boolean ("cursor",
+          "Show mouse cursor",
+          "Whether to show mouse cursor (default off)",
+          DEFAULT_SHOW_CURSOR, G_PARAM_READWRITE));
+  g_object_class_install_property (go_class, PROP_X_POS,
+      g_param_spec_int ("x", "X",
+          "Horizontal coordinate of top left corner for the screen capture "
+          "area", 0, G_MAXINT, DEFAULT_X_POS, G_PARAM_READWRITE));
+  g_object_class_install_property (go_class, PROP_Y_POS,
+      g_param_spec_int ("y", "Y",
+          "Vertical coordinate of top left corner for the screen capture "
+          "area", 0, G_MAXINT, DEFAULT_Y_POS, G_PARAM_READWRITE));
+  g_object_class_install_property (go_class, PROP_WIDTH,
+      g_param_spec_int ("width", "Width",
+          "Width of screen capture area (0 = maximum)",
+          0, G_MAXINT, DEFAULT_WIDTH, G_PARAM_READWRITE));
+  g_object_class_install_property (go_class, PROP_HEIGHT,
+      g_param_spec_int ("height", "Height",
+          "Height of screen capture area (0 = maximum)",
+          0, G_MAXINT, DEFAULT_HEIGHT, G_PARAM_READWRITE));
+
+  gst_element_class_add_static_pad_template (e_class, &src_template);
+
+  gst_element_class_set_static_metadata (e_class,
+      "DirectX DXGI screen capture source",
+      "Source/Video", "Captures screen", "OKADA Jun-ichi <okada@abt.jp>");
+
+  GST_DEBUG_CATEGORY_INIT (dxgiscreencapsrc_debug, "dxgiscreencapsrc", 0,
+      "DirectX DXGI screen capture source");
+}
+
+static void
+gst_dxgi_screen_cap_src_init (GstDXGIScreenCapSrc * src)
+{
+  /* Set src element inital values... */
+  src->capture_x = DEFAULT_X_POS;
+  src->capture_y = DEFAULT_Y_POS;
+  src->capture_w = DEFAULT_WIDTH;
+  src->capture_h = DEFAULT_HEIGHT;
+
+  src->monitor = DEFAULT_MONITOR;
+  src->device_name = DEFAULT_DEVICE_NAME;
+  src->show_cursor = DEFAULT_SHOW_CURSOR;
+
+  src->dxgi_capture = NULL;
+
+  gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
+  gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
+}
+
+static void
+gst_dxgi_screen_cap_src_dispose (GObject * object)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (object);
+
+  g_free (src->device_name);
+  src->device_name = NULL;
+
+  dxgicap_destory (src->dxgi_capture);
+  src->dxgi_capture = NULL;
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gst_dxgi_screen_cap_src_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (object);
+
+  switch (prop_id) {
+    case PROP_MONITOR:
+      src->monitor = g_value_get_int (value);
+      break;
+    case PROP_DEVICE_NAME:
+      g_free (src->device_name);
+      src->device_name = g_value_dup_string (value);
+      break;
+    case PROP_SHOW_CURSOR:
+      src->show_cursor = g_value_get_boolean (value);
+      break;
+    case PROP_X_POS:
+      src->capture_x = g_value_get_int (value);
+      break;
+    case PROP_Y_POS:
+      src->capture_y = g_value_get_int (value);
+      break;
+    case PROP_WIDTH:
+      src->capture_w = g_value_get_int (value);
+      break;
+    case PROP_HEIGHT:
+      src->capture_h = g_value_get_int (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  };
+}
+
+static void
+gst_dxgi_screen_cap_src_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (object);
+
+  switch (prop_id) {
+    case PROP_MONITOR:
+      g_value_set_int (value, src->monitor);
+      break;
+    case PROP_DEVICE_NAME:
+      g_value_set_string (value, src->device_name);
+      break;
+    case PROP_SHOW_CURSOR:
+      g_value_set_boolean (value, src->show_cursor);
+      break;
+    case PROP_X_POS:
+      g_value_set_int (value, src->capture_x);
+      break;
+    case PROP_Y_POS:
+      g_value_set_int (value, src->capture_y);
+      break;
+    case PROP_WIDTH:
+      g_value_set_int (value, src->capture_w);
+      break;
+    case PROP_HEIGHT:
+      g_value_set_int (value, src->capture_h);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  };
+}
+
+static GstCaps *
+gst_dxgi_screen_cap_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
+{
+  GstStructure *structure;
+
+  caps = gst_caps_make_writable (caps);
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  gst_structure_fixate_field_nearest_int (structure, "width", 640);
+  gst_structure_fixate_field_nearest_int (structure, "height", 480);
+  gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
+
+  caps = GST_BASE_SRC_CLASS (parent_class)->fixate (bsrc, caps);
+
+  return caps;
+}
+
+static gboolean
+gst_dxgi_screen_cap_src_set_caps (GstBaseSrc * bsrc, GstCaps * caps)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
+  GstStructure *structure;
+
+  structure = gst_caps_get_structure (caps, 0);
+
+  src->src_rect = src->screen_rect;
+  if (src->capture_w && src->capture_h) {
+    src->src_rect.left += src->capture_x;
+    src->src_rect.top += src->capture_y;
+    src->src_rect.right = src->src_rect.left + src->capture_w;
+    src->src_rect.bottom = src->src_rect.top + src->capture_h;
+  }
+
+  gst_structure_get_fraction (structure, "framerate",
+      &src->rate_numerator, &src->rate_denominator);
+
+  GST_DEBUG_OBJECT (src, "set_caps size %dx%d, %d/%d fps",
+      (gint) RECT_WIDTH (src->src_rect),
+      (gint) RECT_HEIGHT (src->src_rect),
+      src->rate_numerator, src->rate_denominator);
+
+  gst_video_info_from_caps (&src->video_info, caps);
+  gst_base_src_set_blocksize (bsrc, GST_VIDEO_INFO_SIZE (&src->video_info));
+  return TRUE;
+}
+
+static GstCaps *
+gst_dxgi_screen_cap_src_get_caps (GstBaseSrc * bsrc, GstCaps * filter)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
+  RECT rect_dst;
+  GstCaps *caps = NULL;
+
+  HMONITOR hmonitor = _get_hmonitor (src);
+  if (!get_monitor_physical_size (hmonitor, &rect_dst)) {
+    GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
+        ("Specified monitor with index %d not found", src->monitor), (NULL));
+    return NULL;
+  }
+
+  src->screen_rect = rect_dst;
+  if (src->capture_w && src->capture_h &&
+      src->capture_x + src->capture_w <= RECT_WIDTH (rect_dst) &&
+      src->capture_y + src->capture_h <= RECT_HEIGHT (rect_dst)) {
+    rect_dst.left = src->capture_x;
+    rect_dst.top = src->capture_y;
+    rect_dst.right = src->capture_x + src->capture_w;
+    rect_dst.bottom = src->capture_y + src->capture_h;
+  } else {
+    /* Default values */
+    src->capture_x = src->capture_y = 0;
+    src->capture_w = src->capture_h = 0;
+  }
+
+  /* The desktop image is always in the DXGI_FORMAT_B8G8R8A8_UNORM format. */
+  GST_DEBUG_OBJECT (src, "get_cap rect: %ld, %ld, %ld, %ld", rect_dst.left,
+      rect_dst.top, rect_dst.right, rect_dst.bottom);
+
+  caps =
+      gst_caps_new_simple ("video/x-raw", "format", G_TYPE_STRING, "BGRA",
+      "width", G_TYPE_INT, RECT_WIDTH (rect_dst),
+      "height", G_TYPE_INT, RECT_HEIGHT (rect_dst),
+      "framerate", GST_TYPE_FRACTION_RANGE, 1, 1, G_MAXINT,
+      1, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL);
+
+  if (filter) {
+    GstCaps *tmp =
+        gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
+    gst_caps_unref (caps);
+    caps = tmp;
+  }
+  return caps;
+}
+
+static gboolean
+gst_dxgi_screen_cap_src_start (GstBaseSrc * bsrc)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
+  HMONITOR hmonitor = _get_hmonitor (src);
+  if (NULL == hmonitor) {
+    GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
+        ("Specified monitor with index %d not found", src->monitor), (NULL));
+    return FALSE;
+  }
+  src->dxgi_capture = dxgicap_new (hmonitor, src);
+
+  if (NULL == src->dxgi_capture) {
+    GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
+        ("Specified monitor with index %d not found", src->monitor), (NULL));
+    return FALSE;
+  }
+  dxgicap_start (src->dxgi_capture);
+
+  src->frame_number = -1;
+  return TRUE;
+}
+
+static gboolean
+gst_dxgi_screen_cap_src_stop (GstBaseSrc * bsrc)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
+  dxgicap_stop (src->dxgi_capture);
+  dxgicap_destory (src->dxgi_capture);
+  src->dxgi_capture = NULL;
+
+  return TRUE;
+}
+
+static gboolean
+gst_dxgi_screen_cap_src_unlock (GstBaseSrc * bsrc)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (bsrc);
+
+  GST_OBJECT_LOCK (src);
+  if (src->clock_id) {
+    GST_DEBUG_OBJECT (src, "Waking up waiting clock");
+    gst_clock_id_unschedule (src->clock_id);
+  }
+  GST_OBJECT_UNLOCK (src);
+
+  return TRUE;
+}
+
+static GstFlowReturn
+gst_dxgi_screen_cap_src_fill (GstPushSrc * push_src, GstBuffer * buf)
+{
+  GstDXGIScreenCapSrc *src = GST_DXGI_SCREEN_CAP_SRC (push_src);
+  GstClock *clock;
+  GstClockTime buf_time, buf_dur;
+  guint64 frame_number;
+
+  if (G_UNLIKELY (!src->dxgi_capture)) {
+    GST_DEBUG_OBJECT (src, "format wasn't negotiated before create function");
+    return GST_FLOW_NOT_NEGOTIATED;
+  }
+
+  clock = gst_element_get_clock (GST_ELEMENT (src));
+  if (clock != NULL) {
+    GstClockTime time, base_time;
+
+    /* Calculate sync time. */
+
+    time = gst_clock_get_time (clock);
+    base_time = gst_element_get_base_time (GST_ELEMENT (src));
+    buf_time = time - base_time;
+
+    if (src->rate_numerator) {
+      frame_number = gst_util_uint64_scale (buf_time,
+          src->rate_numerator, GST_SECOND * src->rate_denominator);
+    } else {
+      frame_number = -1;
+    }
+  } else {
+    buf_time = GST_CLOCK_TIME_NONE;
+    frame_number = -1;
+  }
+
+  if (frame_number != -1 && frame_number == src->frame_number) {
+    GstClockID id;
+    GstClockReturn ret;
+
+    /* Need to wait for the next frame */
+    frame_number += 1;
+
+    /* Figure out what the next frame time is */
+    buf_time = gst_util_uint64_scale (frame_number,
+        src->rate_denominator * GST_SECOND, src->rate_numerator);
+
+    id = gst_clock_new_single_shot_id (clock,
+        buf_time + gst_element_get_base_time (GST_ELEMENT (src)));
+    GST_OBJECT_LOCK (src);
+    src->clock_id = id;
+    GST_OBJECT_UNLOCK (src);
+
+    GST_DEBUG_OBJECT (src, "Waiting for next frame time %" G_GUINT64_FORMAT,
+        buf_time);
+    ret = gst_clock_id_wait (id, NULL);
+
+    GST_OBJECT_LOCK (src);
+    gst_clock_id_unref (id);
+    src->clock_id = NULL;
+    GST_OBJECT_UNLOCK (src);
+
+    if (ret == GST_CLOCK_UNSCHEDULED) {
+      /* Got woken up by the unlock function */
+      if (clock) {
+        gst_object_unref (clock);
+      }
+      return GST_FLOW_FLUSHING;
+    }
+
+    /* Duration is a complete 1/fps frame duration */
+    buf_dur =
+        gst_util_uint64_scale_int (GST_SECOND, src->rate_denominator,
+        src->rate_numerator);
+  } else if (frame_number != -1) {
+    GstClockTime next_buf_time;
+
+    GST_DEBUG_OBJECT (src, "No need to wait for next frame time %"
+        G_GUINT64_FORMAT " next frame = %" G_GINT64_FORMAT
+        " prev = %" G_GINT64_FORMAT, buf_time, frame_number, src->frame_number);
+    next_buf_time =
+        gst_util_uint64_scale (frame_number + 1,
+        src->rate_denominator * GST_SECOND, src->rate_numerator);
+    /* Frame duration is from now until the next expected capture time */
+    buf_dur = next_buf_time - buf_time;
+  } else {
+    buf_dur = GST_CLOCK_TIME_NONE;
+  }
+  src->frame_number = frame_number;
+
+  if (clock) {
+    gst_object_unref (clock);
+  }
+
+  /* Get the latest desktop frame. */
+  if (dxgicap_acquire_next_frame (src->dxgi_capture, src->show_cursor, 0)) {
+    /* Copy the latest desktop frame to the video frame. */
+    if (dxgicap_copy_buffer (src->dxgi_capture, src->show_cursor,
+            &src->src_rect, &src->video_info, buf)) {
+      GST_BUFFER_TIMESTAMP (buf) = buf_time;
+      GST_BUFFER_DURATION (buf) = buf_dur;
+      return GST_FLOW_OK;
+    }
+  }
+  return GST_FLOW_ERROR;
+}
+
+static HMONITOR
+_get_hmonitor (GstDXGIScreenCapSrc * src)
+{
+  HMONITOR hmonitor = NULL;
+  GST_DEBUG_OBJECT (src, "device_name:%s", GST_STR_NULL (src->device_name));
+  if (NULL != src->device_name) {
+    hmonitor = get_hmonitor_by_device_name (src->device_name);
+  }
+  if (NULL == hmonitor && DEFAULT_MONITOR != src->monitor) {
+    hmonitor = get_hmonitor_by_index (src->monitor);
+  }
+  if (NULL == hmonitor) {
+    hmonitor = get_hmonitor_primary ();
+  }
+  return hmonitor;
+}
diff --git a/sys/winscreencap/gstdxgiscreencapsrc.h b/sys/winscreencap/gstdxgiscreencapsrc.h
new file mode 100644
index 000000000..4e5fa2283
--- /dev/null
+++ b/sys/winscreencap/gstdxgiscreencapsrc.h
@@ -0,0 +1,32 @@
+/* GStreamer
+ * Copyright (C) 2019 OKADA Jun-ichi <okada@abt.jp>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+#ifndef __GST_DXGI_SCREEN_CAP_SRC_H__
+#define __GST_DXGI_SCREEN_CAP_SRC_H__
+
+#include <windows.h>
+#include <gst/gst.h>
+#include <gst/base/gstpushsrc.h>
+
+G_BEGIN_DECLS
+#define GST_TYPE_DXGI_SCREEN_CAP_SRC  (gst_dxgi_screen_cap_src_get_type())
+G_DECLARE_FINAL_TYPE (GstDXGIScreenCapSrc, gst_dxgi_screen_cap_src, GST,
+    DXGI_SCREEN_CAP_SRC, GstPushSrc);
+
+G_END_DECLS
+#endif /* __GST_DXGI_SCREEN_CAP_SRC_H__ */
diff --git a/sys/winscreencap/gstwinscreencap.c b/sys/winscreencap/gstwinscreencap.c
index fb6b332e9..5d49b6d83 100644
--- a/sys/winscreencap/gstwinscreencap.c
+++ b/sys/winscreencap/gstwinscreencap.c
@@ -20,11 +20,15 @@
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
-
 #include "gstwinscreencap.h"
 #include "gstgdiscreencapsrc.h"
 #include "gstdx9screencapsrc.h"
 
+#ifdef HAVE_DXGI_CAP
+#include <versionhelpers.h>
+#include "gstdxgiscreencapsrc.h"
+#endif
+
 static BOOL CALLBACK
 _diplay_monitor_enum (HMONITOR hMon, HDC hdc, LPRECT rect, LPARAM param)
 {
@@ -66,6 +70,15 @@ plugin_init (GstPlugin * plugin)
           GST_RANK_NONE, GST_TYPE_DX9SCREENCAPSRC)) {
     return FALSE;
   }
+#ifdef HAVE_DXGI_CAP
+  if (IsWindows8OrGreater ()) {
+    /* dxgiscreencapsrc is needs Windows8 or later. */
+    if (!gst_element_register (plugin, "dxgiscreencapsrc",
+            GST_RANK_NONE, GST_TYPE_DXGI_SCREEN_CAP_SRC)) {
+      return FALSE;
+    }
+  }
+#endif
 
   return TRUE;
 }
diff --git a/sys/winscreencap/meson.build b/sys/winscreencap/meson.build
index 4e3ef1502..11bf5da42 100644
--- a/sys/winscreencap/meson.build
+++ b/sys/winscreencap/meson.build
@@ -4,23 +4,47 @@ winscreencap_sources = [
   'gstwinscreencap.c',
 ]
 
+have_dxgi = false
+dxgi_c_args = []
+dxgiscreencap_sources = []
+dxgi_dep = []
+
 if host_system != 'windows' or get_option('winscreencap').disabled()
   subdir_done()
 endif
 
 d3d_dep = cc.find_library('d3d9', required : get_option('winscreencap'))
 gdi_dep = cc.find_library('gdi32', required : get_option('winscreencap'))
+d3d11_dep = cc.find_library('d3d11', required : false)
+dxgi_lib_dep = cc.find_library('dxgi', required : false)
+d3d_compile_dep = cc.find_library('d3dcompiler', required : false)
+windowscodecs_dep = cc.find_library('windowscodecs',  required : false)
+dxguid_dep = cc.find_library('dxguid',  required : false) 
+
+have_d3d11_h = cc.has_header('d3d11.h')
+have_dxgi_h = cc.has_header('dxgi1_2.h')
+have_d3dcompiler_h = cc.has_header('d3dcompiler.h')
+have_versionhelpers_h = cc.has_header('versionhelpers.h')
+
 have_d3d9_h = cc.has_header('d3d9.h')
 if not have_d3d9_h and get_option('winscreencap').enabled()
   error('winscreencap plugin enabled but d3d9.h not found')
 endif
 
+have_dxgi = d3d11_dep.found() and dxgi_lib_dep.found() and d3d_compile_dep.found() and windowscodecs_dep.found() and dxguid_dep.found() and have_d3d11_h and have_dxgi_h and have_d3dcompiler_h and have_versionhelpers_h
+
+if have_dxgi
+  dxgi_c_args += ['-DHAVE_DXGI_CAP']
+  dxgiscreencap_sources += ['dxgicapture.c', 'gstdxgiscreencapsrc.c']
+  dxgi_dep += [d3d11_dep, dxgi_lib_dep, d3d_compile_dep, windowscodecs_dep, dxguid_dep]
+endif
+
 if d3d_dep.found() and gdi_dep.found() and have_d3d9_h
   gstwinscreencap = library('gstwinscreencap',
-    winscreencap_sources,
-    c_args : gst_plugins_bad_args,
+    winscreencap_sources + dxgiscreencap_sources,
+    c_args : gst_plugins_bad_args + dxgi_c_args,
     include_directories : [configinc],
-    dependencies : [gstbase_dep, gstvideo_dep, d3d_dep, gdi_dep],
+    dependencies : [gstbase_dep, gstvideo_dep, d3d_dep, gdi_dep] + dxgi_dep,
     install : true,
     install_dir : plugins_install_dir,
   )