[FFmpeg-devel] [PATCH] avdevice: add dxgigrab
aline.gondimsantos at savoirfairelinux.com
aline.gondimsantos at savoirfairelinux.com
Thu Feb 9 16:22:55 EET 2023
From: Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
A dxgi grab device may be either a display or a window.
Differently from the existing gdigrab, this new device does
not make the mouse to flick and also allows proper grabbing of
accelerated windows, such as chrome or visual studio code.
Signed-off-by: Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
---
configure | 1 +
libavdevice/Makefile | 4 +
libavdevice/alldevices.c | 1 +
libavdevice/d3dHelpers.h | 59 ++++++++
libavdevice/direct3d11.interop.h | 51 +++++++
libavdevice/dxgigrab.cpp | 225 +++++++++++++++++++++++++++++++
libavdevice/dxgigrab.h | 83 ++++++++++++
libavdevice/dxgigrab_c.c | 59 ++++++++
libavdevice/dxgigrab_c.h | 98 ++++++++++++++
libavdevice/windows_capture.cpp | 184 +++++++++++++++++++++++++
libavdevice/windows_capture.h | 82 +++++++++++
11 files changed, 847 insertions(+)
create mode 100644 libavdevice/d3dHelpers.h
create mode 100644 libavdevice/direct3d11.interop.h
create mode 100644 libavdevice/dxgigrab.cpp
create mode 100644 libavdevice/dxgigrab.h
create mode 100644 libavdevice/dxgigrab_c.c
create mode 100644 libavdevice/dxgigrab_c.h
create mode 100644 libavdevice/windows_capture.cpp
create mode 100644 libavdevice/windows_capture.h
diff --git a/configure b/configure
index 12184c7f26..c9cbee0c09 100755
--- a/configure
+++ b/configure
@@ -3529,6 +3529,7 @@ fbdev_outdev_deps="linux_fb_h"
gdigrab_indev_deps="CreateDIBSection"
gdigrab_indev_extralibs="-lgdi32"
gdigrab_indev_select="bmp_decoder"
+dxgigrab_indev_extralibs="-ldxgi -ld3d11"
iec61883_indev_deps="libiec61883"
iec61883_indev_select="dv_demuxer"
jack_indev_deps="libjack"
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index 8a62822b69..6740012000 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -30,6 +30,7 @@ OBJS-$(CONFIG_FBDEV_INDEV) += fbdev_dec.o \
OBJS-$(CONFIG_FBDEV_OUTDEV) += fbdev_enc.o \
fbdev_common.o
OBJS-$(CONFIG_GDIGRAB_INDEV) += gdigrab.o
+OBJS-$(CONFIG_DXGIGRAB_INDEV) += windows_capture.o dxgigrab.o dxgigrab_c.o
OBJS-$(CONFIG_IEC61883_INDEV) += iec61883.o
OBJS-$(CONFIG_JACK_INDEV) += jack.o timefilter.o
OBJS-$(CONFIG_KMSGRAB_INDEV) += kmsgrab.o
@@ -72,5 +73,8 @@ SKIPHEADERS-$(CONFIG_V4L2_INDEV) += v4l2-common.h
SKIPHEADERS-$(CONFIG_V4L2_OUTDEV) += v4l2-common.h
SKIPHEADERS-$(CONFIG_ALSA) += alsa.h
SKIPHEADERS-$(CONFIG_SNDIO) += sndio.h
+SKIPHEADERS-$(CONFIG_DXGIGRAB_INDEV) += dxgigrab.h \
+ windows_capture.h \
+ dxgigrab_c.h
TESTPROGS-$(CONFIG_JACK_INDEV) += timefilter
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index 22323a0a44..fb0a37513b 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -35,6 +35,7 @@ extern const AVInputFormat ff_dshow_demuxer;
extern const AVInputFormat ff_fbdev_demuxer;
extern const AVOutputFormat ff_fbdev_muxer;
extern const AVInputFormat ff_gdigrab_demuxer;
+extern const AVInputFormat ff_dxgigrab_demuxer;
extern const AVInputFormat ff_iec61883_demuxer;
extern const AVInputFormat ff_jack_demuxer;
extern const AVInputFormat ff_kmsgrab_demuxer;
diff --git a/libavdevice/d3dHelpers.h b/libavdevice/d3dHelpers.h
new file mode 100644
index 0000000000..d8d2c003ec
--- /dev/null
+++ b/libavdevice/d3dHelpers.h
@@ -0,0 +1,59 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+
+#include <winrt/Windows.UI.Composition.h>
+#include <windows.ui.composition.interop.h>
+#include <d2d1_1.h>
+
+inline auto
+CreateD3DDevice(
+ D3D_DRIVER_TYPE const type,
+ winrt::com_ptr<ID3D11Device>& device)
+{
+ WINRT_ASSERT(!device);
+
+ UINT flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;
+
+ return D3D11CreateDevice(
+ nullptr,
+ type,
+ nullptr,
+ flags,
+ nullptr, 0,
+ D3D11_SDK_VERSION,
+ device.put(),
+ nullptr,
+ nullptr);
+}
+
+inline auto
+CreateD3DDevice()
+{
+ winrt::com_ptr<ID3D11Device> device;
+ HRESULT hr = CreateD3DDevice(D3D_DRIVER_TYPE_HARDWARE, device);
+
+ if (DXGI_ERROR_UNSUPPORTED == hr)
+ {
+ hr = CreateD3DDevice(D3D_DRIVER_TYPE_WARP, device);
+ }
+
+ winrt::check_hresult(hr);
+ return device;
+}
diff --git a/libavdevice/direct3d11.interop.h b/libavdevice/direct3d11.interop.h
new file mode 100644
index 0000000000..62c9b0843e
--- /dev/null
+++ b/libavdevice/direct3d11.interop.h
@@ -0,0 +1,51 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+#include <winrt/windows.graphics.directx.direct3d11.h>
+
+extern "C"
+{
+ HRESULT __stdcall CreateDirect3D11DeviceFromDXGIDevice(::IDXGIDevice* dxgiDevice,
+ ::IInspectable** graphicsDevice);
+
+ HRESULT __stdcall CreateDirect3D11SurfaceFromDXGISurface(::IDXGISurface* dgxiSurface,
+ ::IInspectable** graphicsSurface);
+}
+
+struct __declspec(uuid("A9B3D012-3DF2-4EE3-B8D1-8695F457D3C1"))
+ IDirect3DDxgiInterfaceAccess : ::IUnknown
+{
+ virtual HRESULT __stdcall GetInterface(GUID const& id, void** object) = 0;
+};
+
+inline auto CreateDirect3DDevice(IDXGIDevice* dxgi_device)
+{
+ winrt::com_ptr<::IInspectable> d3d_device;
+ winrt::check_hresult(CreateDirect3D11DeviceFromDXGIDevice(dxgi_device, d3d_device.put()));
+ return d3d_device.as<winrt::Windows::Graphics::DirectX::Direct3D11::IDirect3DDevice>();
+}
+
+template <typename T>
+auto GetDXGIInterfaceFromObject(winrt::Windows::Foundation::IInspectable const& object)
+{
+ auto access = object.as<IDirect3DDxgiInterfaceAccess>();
+ winrt::com_ptr<T> result;
+ winrt::check_hresult(access->GetInterface(winrt::guid_of<T>(), result.put_void()));
+ return result;
+}
diff --git a/libavdevice/dxgigrab.cpp b/libavdevice/dxgigrab.cpp
new file mode 100644
index 0000000000..9774e72ab1
--- /dev/null
+++ b/libavdevice/dxgigrab.cpp
@@ -0,0 +1,225 @@
+/*
+ * DXGI video grab interface
+ *
+ * This file is part of FFmpeg.
+ *
+ * Copyright (C) 2022 Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * DXGI frame device demuxer
+ * @author Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ */
+
+#include "dxgigrab.h"
+
+#include <dwmapi.h>
+#include <sstream>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <libavutil/parseutils.h>
+#ifdef __cplusplus
+}
+#endif
+
+static BOOL CALLBACK enumMonitor(HMONITOR handle, HDC hdc, LPRECT rect,
+ LPARAM lParam)
+{
+ MonitorData* monitorData = reinterpret_cast<MonitorData*>(lParam);
+
+ if (monitorData->curId == 0 || monitorData->desiredId == monitorData->curId) {
+ monitorData->rect = *rect;
+ monitorData->id = monitorData->curId;
+
+ monitorData->hmnt = handle;
+ }
+
+ return (monitorData->desiredId > monitorData->curId++);
+}
+
+int dxgigrab_read_header(AVFormatContext *s1)
+{
+ struct dxgigrab *s = static_cast<dxgigrab*>(s1->priv_data);
+ if (!s->internal_struct)
+ s->internal_struct = new dxgigrab_internal();
+ struct dxgigrab_internal* x_internal = static_cast<dxgigrab_internal*>(s->internal_struct);
+ MonitorData monitorData;
+ monitorData.rect.top = 0;
+ monitorData.rect.left = 0;
+ monitorData.rect.bottom = 0;
+ monitorData.rect.right = 0;
+ std::string handle;
+ AVStream *st = NULL;
+
+ if (!strncmp(s1->url, "hwnd=", 5)) {
+ if (!s->hwnd) {
+ handle = s1->url + 5;
+ try {
+ s->hwnd = reinterpret_cast<HWND>(std::stoull(handle, nullptr, 16));
+ } catch (...) {}
+ if (!s->hwnd) {
+ av_log(s1, AV_LOG_ERROR,
+ "Can't find window from handle '%s', aborting.\n", handle.c_str());
+ return AVERROR_EXTERNAL;
+ }
+ }
+ } else {
+ s->hwnd = NULL;
+ char *display_number = av_strdup(s1->url);
+ if (!sscanf(s1->url, "%[^+]+%d,%d ", display_number, &s->offset_x, &s->offset_y)) {
+ av_log(s1, AV_LOG_ERROR,
+ "Please use \"<screenNumber>+<X,Y> <WidthxHeight>\" or \"hwnd=<windowHandle>\" to specify your target.\n");
+ return AVERROR_EXTERNAL;
+ }
+ if (s->offset_x || s->offset_y) {
+ av_log(s1,
+ AV_LOG_ERROR,
+ "This device does not support partial screen sharing.\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ monitorData.desiredId = std::stoi(display_number);
+ av_freep(&display_number);
+ try {
+ LPARAM lParam = reinterpret_cast<LPARAM>(&monitorData);
+ EnumDisplayMonitors(NULL, NULL, enumMonitor, lParam);
+ } catch (...) {
+ }
+ }
+
+ s->hmnt = monitorData.hmnt;
+ s->rect = monitorData.rect;
+
+ if (!s->hmnt && !s->hwnd) {
+ av_log(s1, AV_LOG_ERROR,
+ "Please use \"<screenNumber>+<X,Y> <WidthxHeight>\" or \"hwnd=<windowHandle>\" to "
+ "specify your target.\n");
+ return AVERROR_EXTERNAL;
+ }
+
+ bool openWindow = true;
+ if (!s1->nb_streams) {
+ st = avformat_new_stream(s1, NULL);
+ } else {
+ openWindow = false;
+ st = s1->streams[0];
+ }
+ if (!st) {
+ return AVERROR(ENOMEM);
+ }
+
+ std::lock_guard lk(x_internal->mtx);
+ if (openWindow) {
+ auto d3dDevice = CreateD3DDevice();
+ auto dxgiDevice = d3dDevice.as<IDXGIDevice>();
+ auto m_device = CreateDirect3DDevice(dxgiDevice.get());
+
+ auto activation_factory = winrt::get_activation_factory<winrt::Windows::Graphics::Capture::GraphicsCaptureItem>();
+ auto interop_factory = activation_factory.as<IGraphicsCaptureItemInterop>();
+ winrt::Windows::Graphics::Capture::GraphicsCaptureItem windowItem = { nullptr };
+
+ try {
+ if (s->hwnd) {
+ winrt::check_hresult(interop_factory
+ ->CreateForWindow(s->hwnd, // we should have create for display too
+ winrt::guid_of<ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>(),
+ reinterpret_cast<void**>(winrt::put_abi(windowItem))));
+ } else if (s->hmnt) {
+ winrt::check_hresult(interop_factory
+ ->CreateForMonitor(s->hmnt, // we should have create for display too
+ winrt::guid_of<ABI::Windows::Graphics::Capture::IGraphicsCaptureItem>(),
+ reinterpret_cast<void**>(winrt::put_abi(windowItem))));
+ }
+ } catch (winrt::hresult_error &err) {
+ av_log(s, AV_LOG_ERROR, "CreateForWindow failed: %s\n", err.message().c_str());
+ return AVERROR_EXTERNAL;
+ } catch (...) {
+ av_log(s, AV_LOG_ERROR, "CreateForWindow failed\n");
+ return AVERROR_EXTERNAL;
+ }
+ av_log(s, AV_LOG_ERROR, "CreateForWindow success\n");
+
+ x_internal->m_capture.reset(new WindowsCapture(m_device, windowItem, monitorData));
+ x_internal->m_capture->StartCapture();
+ x_internal->m_capture->checkNewFrameArrived();
+ x_internal->m_capture->window = handle;
+ x_internal->windowHandle = handle;
+ }
+
+ s->time_base = av_inv_q(s->framerate);
+
+ avpriv_set_pts_info(st, 64, 1, 1000000);
+
+ s->width = x_internal->m_capture->m_DeviceSize.Width;
+ s->height = x_internal->m_capture->m_DeviceSize.Height;
+
+ x_internal->m_capture->screen.first = monitorData.hmnt;
+ x_internal->m_capture->screen.second = monitorData.rect;
+
+ s->time_frame = av_gettime_relative();
+
+ st->avg_frame_rate = av_inv_q(s->time_base);
+
+ auto frame_size_bits = (int64_t)s->width * s->height * 4 * 8;
+ if (frame_size_bits / 8 + AV_INPUT_BUFFER_PADDING_SIZE > INT_MAX) {
+ av_log(s, AV_LOG_ERROR, "Captured area is too large\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ s->frame_size = frame_size_bits / 8;
+
+ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+ st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
+ st->codecpar->width = s->width;
+ st->codecpar->height = s->height;
+ st->codecpar->format = AV_PIX_FMT_RGBA;
+ st->codecpar->bit_rate = av_rescale(frame_size_bits, st->avg_frame_rate.num, st->avg_frame_rate.den);
+
+ return 0;
+}
+
+int dxgigrab_read_packet(AVFormatContext *s1, AVPacket *pkt)
+{
+ struct dxgigrab *s = static_cast<dxgigrab*>(s1->priv_data);
+ struct dxgigrab_internal *x_internal = static_cast<dxgigrab_internal*>(s->internal_struct);
+ std::lock_guard lk(x_internal->mtx);
+ int ret = 0;
+ int64_t pts = av_gettime();
+
+ if (!x_internal->m_capture)
+ return 0; // If m_capture not available, return empty frame
+ ret = x_internal->m_capture->GetPkt(pkt);
+ if (ret < 0)
+ return ret;
+ pkt->dts = pkt->pts = pts;
+
+ return ret;
+}
+
+int dxgigrab_read_close(AVFormatContext *s1)
+{
+ struct dxgigrab* s = static_cast<dxgigrab*>(s1->priv_data);
+ struct dxgigrab_internal* x_internal = static_cast<dxgigrab_internal*>(s->internal_struct);
+ std::lock_guard lk(x_internal->mtx);
+
+ if (!x_internal->m_capture)
+ return 0; // If m_capture not available, no need to close it
+ x_internal->m_capture->Close();
+
+ return 0;
+}
diff --git a/libavdevice/dxgigrab.h b/libavdevice/dxgigrab.h
new file mode 100644
index 0000000000..92cad7dab8
--- /dev/null
+++ b/libavdevice/dxgigrab.h
@@ -0,0 +1,83 @@
+/*
+ * DXGI video grab interface
+ *
+ * This file is part of FFmpeg.
+ *
+ * Copyright (C) 2022 Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * DXGI frame device demuxer
+ * @author Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ */
+
+#ifndef AVDEVICE_DXGI_H
+#define AVDEVICE_DXGI_H
+
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include "dxgigrab_c.h"
+#ifdef __cplusplus
+}
+#endif
+
+#include <Unknwn.h>
+#include <inspectable.h>
+
+// WinRT
+#include <winrt/Windows.Foundation.h>
+#include <winrt/Windows.System.h>
+#include <winrt/Windows.UI.h>
+#include <winrt/Windows.UI.Composition.h>
+#include <winrt/Windows.UI.Composition.Desktop.h>
+#include <winrt/Windows.UI.Popups.h>
+#include <winrt/Windows.Graphics.Capture.h>
+#include <winrt/Windows.Graphics.DirectX.h>
+#include <winrt/Windows.Graphics.DirectX.Direct3d11.h>
+#include <windows.graphics.capture.interop.h>
+#include <windows.graphics.capture.h>
+
+#include <windows.ui.composition.interop.h>
+#include <DispatcherQueue.h>
+
+// STL
+#include <atomic>
+#include <memory>
+#include <mutex>
+
+// D3D
+#include <d3d11_4.h>
+#include <dxgi1_6.h>
+#include <d2d1_3.h>
+#include <wincodec.h>
+
+// Internal
+#include "d3dHelpers.h"
+#include "direct3d11.interop.h"
+#include "windows_capture.h"
+
+struct dxgigrab_internal {
+ std::unique_ptr<WindowsCapture> m_capture{ nullptr };
+ std::string windowHandle;
+ std::mutex mtx;
+};
+
+#endif /* AVDEVICE_DXGI_H */
diff --git a/libavdevice/dxgigrab_c.c b/libavdevice/dxgigrab_c.c
new file mode 100644
index 0000000000..c53d757abd
--- /dev/null
+++ b/libavdevice/dxgigrab_c.c
@@ -0,0 +1,59 @@
+/*
+ * DXGI video grab interface
+ *
+ * This file is part of FFmpeg.
+ *
+ * Copyright (C) 2022 Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * DXGI frame device demuxer
+ * @author Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ */
+
+#include "dxgigrab_c.h"
+
+#define OFFSET(x) offsetof(struct dxgigrab, x)
+#define DEC AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+ { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "ntsc"}, 0, INT_MAX, DEC },
+ { "video_size", "set video frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
+ { "offset_x", "capture area x offset", OFFSET(offset_x), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
+ { "offset_y", "capture area y offset", OFFSET(offset_y), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC },
+ { NULL },
+};
+
+static const AVClass dxgigrab_class = {
+ .class_name = "DXGIgrab indev",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+ .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
+};
+
+/** dxgi grabber device demuxer declaration */
+AVInputFormat ff_dxgigrab_demuxer = {
+ .name = "dxgigrab",
+ .long_name = NULL_IF_CONFIG_SMALL("DXGI API Windows frame grabber"),
+ .priv_data_size = sizeof(struct dxgigrab),
+ .read_header = dxgigrab_read_header,
+ .read_packet = dxgigrab_read_packet,
+ .read_close = dxgigrab_read_close,
+ .flags = AVFMT_NOFILE,
+ .priv_class = &dxgigrab_class,
+};
diff --git a/libavdevice/dxgigrab_c.h b/libavdevice/dxgigrab_c.h
new file mode 100644
index 0000000000..d624ca0683
--- /dev/null
+++ b/libavdevice/dxgigrab_c.h
@@ -0,0 +1,98 @@
+/*
+ * DXGI video grab interface
+ *
+ * This file is part of FFmpeg.
+ *
+ * Copyright (C) 2022 Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * DXGI frame device demuxer
+ * @author Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ */
+
+#ifndef AVDEVICE_DXGI_C_H
+#define AVDEVICE_DXGI_C_H
+
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "libavformat/internal.h"
+#include "config.h"
+#include "libavutil/opt.h"
+#include "libavutil/time.h"
+
+#include <windows.h>
+
+/**
+ * DXGI Device Demuxer context
+ */
+struct dxgigrab {
+ const AVClass *avclass; /**< Class for private options */
+
+ int frame_size; /**< Size in bytes of the frame pixel data */
+ AVRational time_base; /**< Time base */
+ int64_t time_frame; /**< Current time */
+
+ AVRational framerate; /**< Capture framerate (private option) */
+ int width; /**< Width of the grab frame (private option) */
+ int height; /**< Height of the grab frame (private option) */
+ int offset_x; /**< Capture x offset (private option) */
+ int offset_y; /**< Capture y offset (private option) */
+
+ HWND hwnd; /**< Handle of the Window for the grab */
+ HMONITOR hmnt; /**< Handle of the Screen for the grab */
+ RECT rect; /**< Rect of the Screen for the grab */
+
+ void* internal_struct;
+};
+
+/**
+ * Initializes the dxgi grab device demuxer (public device demuxer API).
+ *
+ * @param s1 Context from avformat core
+ * @return AVERROR_IO error, 0 success
+ */
+int dxgigrab_read_header(AVFormatContext *s1);
+
+/**
+ * Grabs a frame from dxgi (public device demuxer API).
+ *
+ * @param s1 Context from avformat core
+ * @param pkt Packet holding the grabbed frame
+ * @return frame size in bytes
+ */
+int dxgigrab_read_packet(AVFormatContext *s1, AVPacket *pkt);
+
+
+/**
+ * Closes dxgi frame grabber (public device demuxer API).
+ *
+ * @param s1 Context from avformat core
+ * @return 0 success, !0 failure
+ */
+int dxgigrab_read_close(AVFormatContext *s1);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AVDEVICE_DXGI_C_H */
diff --git a/libavdevice/windows_capture.cpp b/libavdevice/windows_capture.cpp
new file mode 100644
index 0000000000..c6b29f1a1d
--- /dev/null
+++ b/libavdevice/windows_capture.cpp
@@ -0,0 +1,184 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * Copyright (C) 2022 Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @author Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ */
+
+#include "dxgigrab.h"
+
+#include <d3d11.h>
+
+using namespace winrt;
+using namespace Windows;
+using namespace Windows::Foundation;
+using namespace Windows::System;
+using namespace Windows::Graphics;
+using namespace Windows::Graphics::Capture;
+using namespace Windows::Graphics::DirectX;
+using namespace Windows::Graphics::DirectX::Direct3D11;
+using namespace Windows::Foundation::Numerics;
+using namespace Windows::UI;
+using namespace Windows::UI::Composition;
+
+WindowsCapture::WindowsCapture(
+ IDirect3DDevice const& device,
+ GraphicsCaptureItem const& item,
+ MonitorData& monitorData)
+{
+ m_item = item;
+ m_device = device;
+
+ m_d3dDevice = GetDXGIInterfaceFromObject<ID3D11Device>(m_device);
+ m_d3dDevice->GetImmediateContext(m_d3dContext.put());
+ screen.first = monitorData.hmnt;
+ screen.second = monitorData.rect;
+
+ m_DeviceSize = m_item.Size();
+
+ // Create framepool, define pixel format (DXGI_FORMAT_B8G8R8A8_UNORM), and frame size.
+ m_framePool = Direct3D11CaptureFramePool::Create(
+ m_device,
+ DirectXPixelFormat::R8G8B8A8UIntNormalized,
+ 2,
+ m_DeviceSize);
+ m_session = m_framePool.CreateCaptureSession(m_item);
+ auto sup = m_session.IsSupported();
+}
+
+// Start sending capture frames
+void
+WindowsCapture::StartCapture()
+{
+ std::lock_guard<std::mutex> lk(mtx_);
+ running_ = true;
+ m_session.StartCapture();
+}
+
+// Process captured frames
+void
+WindowsCapture::Close()
+{
+ std::lock_guard<std::mutex> lk(mtx_);
+ running_ = false;
+ if (texture) {
+ texture->Release();
+ }
+ m_framePool.Close();
+ m_session.Close();
+ m_d3dContext->ClearState();
+ m_d3dContext->Flush();
+ m_d3dDevice->Release();
+
+ texture = nullptr;
+ m_framePool = nullptr;
+ m_session = nullptr;
+ m_item = nullptr;
+}
+
+bool
+WindowsCapture::checkNewFrameArrived()
+{
+ std::lock_guard<std::mutex> lk(mtx_);
+ if (!running_)
+ return false;
+ auto shouldResize = false;
+
+ auto frame = m_framePool.TryGetNextFrame();
+ if (!frame)
+ return false;
+
+ auto frameSurface = GetDXGIInterfaceFromObject<ID3D11Texture2D>(frame.Surface());
+
+ D3D11_TEXTURE2D_DESC desc;
+ frameSurface->GetDesc(&desc);
+ auto frameContentSize = frame.ContentSize();
+ if (desc.Width <= 0 || desc.Height <= 0)
+ return false;
+
+ shouldResize = frameContentSize.Width != m_DeviceSize.Width || frameContentSize.Height != m_DeviceSize.Height;
+
+ if (shouldResize) {
+ m_DeviceSize.Width = frameContentSize.Width;
+ m_DeviceSize.Height = frameContentSize.Height;
+ m_framePool.Recreate(m_device, DirectXPixelFormat::R8G8B8A8UIntNormalized, 2, m_DeviceSize);
+ return false;
+ }
+
+ texDesc.Width = desc.Width;
+ texDesc.Height = desc.Height;
+ texDesc.MipLevels = desc.MipLevels;
+ texDesc.ArraySize = desc.ArraySize;
+ texDesc.Format = desc.Format;
+ texDesc.SampleDesc = desc.SampleDesc;
+ texDesc.Usage = D3D11_USAGE_STAGING;
+ texDesc.BindFlags = 0;
+ texDesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+ texDesc.MiscFlags = 0;
+
+ m_d3dDevice->CreateTexture2D(&texDesc, nullptr, &texture);
+
+ // copy the texture to a staging resource
+ m_d3dContext->CopyResource(texture, frameSurface.get());
+
+ return true;
+}
+
+int
+WindowsCapture::GetPkt(AVPacket *pkt)
+{
+ if (!checkNewFrameArrived() || !running_ || !texture)
+ return 0;
+ std::lock_guard<std::mutex> lk(mtx_);
+
+ // now, map the staging resource TO CPU
+ D3D11_MAPPED_SUBRESOURCE mapInfo;
+ m_d3dContext->Map(
+ texture,
+ 0,
+ D3D11_MAP_READ,
+ 0,
+ &mapInfo);
+
+ m_d3dContext->Unmap(texture, 0);
+
+ auto ret = av_new_packet(pkt, mapInfo.DepthPitch);
+ if (ret < 0) {
+ if (mapInfo.DepthPitch) {
+ av_packet_unref(pkt);
+ }
+ texture->Release();
+ texture = nullptr;
+ return ret;
+ }
+
+ auto idx = 0;
+ for (auto y = 0; y < m_DeviceSize.Height; y++) {
+ for (auto x = 0; x < m_DeviceSize.Width * 4; x++) {
+ pkt->data[idx] = static_cast<uint8_t*>(mapInfo.pData)[y * mapInfo.RowPitch + x];
+ idx++;
+ }
+ }
+
+ texture->Release();
+ texture = nullptr;
+
+ return 0;
+}
diff --git a/libavdevice/windows_capture.h b/libavdevice/windows_capture.h
new file mode 100644
index 0000000000..3e9269ed58
--- /dev/null
+++ b/libavdevice/windows_capture.h
@@ -0,0 +1,82 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * Copyright (C) 2022 Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @author Aline Gondim Santos <aline.gondimsantos at savoirfairelinux.com>
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#include <libavutil/hwcontext_d3d11va.h>
+#ifdef __cplusplus
+}
+#endif
+
+#include <mutex>
+#include <memory>
+
+#include <windows.h>
+
+struct MonitorData {
+ HMONITOR hmnt = NULL;
+ RECT rect;
+ int id = 0;
+ int curId = 0;
+ int desiredId = 0;
+};
+
+class WindowsCapture
+{
+public:
+ WindowsCapture(
+ winrt::Windows::Graphics::DirectX::Direct3D11::IDirect3DDevice const& device,
+ winrt::Windows::Graphics::Capture::GraphicsCaptureItem const& item,
+ MonitorData& monitorData);
+ ~WindowsCapture() { Close(); }
+
+ void StartCapture();
+
+ int GetPkt(AVPacket *pkt);
+
+ void Close();
+ std::string window;
+
+ bool checkNewFrameArrived();
+ winrt::Windows::Graphics::SizeInt32 m_DeviceSize;
+ std::pair<bool, RECT> screen;
+
+private:
+ winrt::Windows::Graphics::Capture::GraphicsCaptureItem m_item{ nullptr };
+ winrt::Windows::Graphics::Capture::Direct3D11CaptureFramePool m_framePool{ nullptr };
+ winrt::Windows::Graphics::Capture::GraphicsCaptureSession m_session{ nullptr };
+
+ winrt::Windows::Graphics::DirectX::Direct3D11::IDirect3DDevice m_device {nullptr};
+ winrt::com_ptr<ID3D11Device> m_d3dDevice{nullptr};
+ winrt::com_ptr<ID3D11DeviceContext> m_d3dContext {nullptr};
+
+ D3D11_TEXTURE2D_DESC texDesc;
+ ID3D11Texture2D *texture {nullptr};
+
+ std::mutex mtx_;
+ bool running_;
+};
--
2.34.1
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