├── .gitignore ├── Cargo.toml ├── LICENSE ├── README.md └── src └── lib.rs /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled files 2 | *.o 3 | *.so 4 | *.rlib 5 | *.dll 6 | 7 | # Executables 8 | *.exe 9 | 10 | # Generated by Cargo 11 | /target/ 12 | 13 | Cargo.lock 14 | *~ -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "dxgcap" 3 | version = "0.2.4" 4 | authors = ["jojo "] 5 | description = "Screen capturing with DXGI for Windows in Rust" 6 | repository = "https://github.com/bryal/dxgcap-rs" 7 | documentation = "https://docs.rs/dxgcap/*/x86_64-pc-windows-msvc/dxgcap/" 8 | readme = "README.md" 9 | keywords = ["Windows", "DXGI", "screen", "record", "capture"] 10 | license = "AGPL-3.0" 11 | edition = "2018" 12 | 13 | [dependencies] 14 | winapi = { version = "0.3.8", features = ["d3d11", "d3dcommon", "dxgi", "dxgi1_2", "dxgitype", "ntdef", "unknwnbase", "windef", "winerror", "winuser"] } 15 | wio = "0.2.2" -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published by 637 | the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # dxgcap 2 | 3 | Screen capturing for Windows using the DXGI Desktop Duplication API. 4 | 5 | [![Crate](https://img.shields.io/crates/v/dxgcap.svg)](https://crates.io/crates/dxgcap/) 6 | 7 | [Documentation](https://docs.rs/dxgcap/*/x86_64-pc-windows-msvc/dxgcap/) 8 | 9 | ## ARCHIVED 10 | 11 | I don't have or use Windows anywhere anymore, so I can't maintain this. 12 | Feel free to fork it if you have any improvements you'd like to add. 13 | 14 | ## License 15 | 16 | AGPLv3 17 | 18 | Copyright (C) 2019 Johan Johansson 19 | 20 | This program is free software: you can redistribute it and/or 21 | modify it under the terms of the GNU Affero General Public License 22 | as published by the Free Software Foundation, either version 3 of 23 | the License, or (at your option) any later version. 24 | 25 | This program is distributed in the hope that it will be useful, but 26 | WITHOUT ANY WARRANTY; without even the implied warranty of 27 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 28 | Affero General Public License for more details. 29 | 30 | See [LICENSE](./LICENSE) 31 | -------------------------------------------------------------------------------- /src/lib.rs: -------------------------------------------------------------------------------- 1 | //! Capture the screen with DXGI Desktop Duplication 2 | 3 | #![cfg(windows)] 4 | 5 | extern crate winapi; 6 | extern crate wio; 7 | 8 | use std::mem::zeroed; 9 | use std::{mem, ptr, slice}; 10 | use winapi::shared::dxgi::{ 11 | CreateDXGIFactory1, IDXGIAdapter, IDXGIAdapter1, IDXGIFactory1, IDXGIOutput, IDXGISurface1, 12 | IID_IDXGIFactory1, DXGI_MAP_READ, DXGI_OUTPUT_DESC, DXGI_RESOURCE_PRIORITY_MAXIMUM, 13 | }; 14 | use winapi::shared::dxgi1_2::{IDXGIOutput1, IDXGIOutputDuplication}; 15 | use winapi::shared::dxgitype::*; 16 | // use winapi::shared::ntdef::*; 17 | use winapi::shared::windef::*; 18 | use winapi::shared::winerror::*; 19 | use winapi::um::d3d11::*; 20 | use winapi::um::d3dcommon::*; 21 | use winapi::um::unknwnbase::*; 22 | use winapi::um::winuser::*; 23 | use wio::com::ComPtr; 24 | 25 | /// Color represented by additive channels: Blue (b), Green (g), Red (r), and Alpha (a). 26 | #[derive(Copy, Clone, Debug, PartialOrd, PartialEq, Eq, Ord)] 27 | pub struct BGRA8 { 28 | pub b: u8, 29 | pub g: u8, 30 | pub r: u8, 31 | pub a: u8, 32 | } 33 | 34 | /// Possible errors when capturing 35 | #[derive(Debug)] 36 | pub enum CaptureError { 37 | /// Could not duplicate output, access denied. Might be in protected fullscreen. 38 | AccessDenied, 39 | /// Access to the duplicated output was lost. Likely, mode was changed e.g. window => full 40 | AccessLost, 41 | /// Error when trying to refresh outputs after some failure. 42 | RefreshFailure, 43 | /// AcquireNextFrame timed out. 44 | Timeout, 45 | /// General/Unexpected failure 46 | Fail(&'static str), 47 | } 48 | 49 | /// Check whether the HRESULT represents a failure 50 | pub fn hr_failed(hr: HRESULT) -> bool { 51 | hr < 0 52 | } 53 | 54 | fn create_dxgi_factory_1() -> ComPtr { 55 | unsafe { 56 | let mut factory = ptr::null_mut(); 57 | let hr = CreateDXGIFactory1(&IID_IDXGIFactory1, &mut factory); 58 | if hr_failed(hr) { 59 | panic!("Failed to create DXGIFactory1, {:x}", hr) 60 | } else { 61 | ComPtr::from_raw(factory as *mut IDXGIFactory1) 62 | } 63 | } 64 | } 65 | 66 | fn d3d11_create_device( 67 | adapter: *mut IDXGIAdapter, 68 | ) -> (ComPtr, ComPtr) { 69 | unsafe { 70 | let (mut d3d11_device, mut device_context) = (ptr::null_mut(), ptr::null_mut()); 71 | let hr = D3D11CreateDevice( 72 | adapter, 73 | D3D_DRIVER_TYPE_UNKNOWN, 74 | ptr::null_mut(), 75 | 0, 76 | ptr::null_mut(), 77 | 0, 78 | D3D11_SDK_VERSION, 79 | &mut d3d11_device, 80 | &mut D3D_FEATURE_LEVEL_9_1, 81 | &mut device_context, 82 | ); 83 | if hr_failed(hr) { 84 | panic!("Failed to create d3d11 device and device context, {:x}", hr) 85 | } else { 86 | ( 87 | ComPtr::from_raw(d3d11_device as *mut ID3D11Device), 88 | ComPtr::from_raw(device_context), 89 | ) 90 | } 91 | } 92 | } 93 | 94 | fn get_adapter_outputs(adapter: &IDXGIAdapter1) -> Vec> { 95 | let mut outputs = Vec::new(); 96 | for i in 0.. { 97 | unsafe { 98 | let mut output = ptr::null_mut(); 99 | if hr_failed(adapter.EnumOutputs(i, &mut output)) { 100 | break; 101 | } else { 102 | let mut out_desc = zeroed(); 103 | (*output).GetDesc(&mut out_desc); 104 | if out_desc.AttachedToDesktop != 0 { 105 | outputs.push(ComPtr::from_raw(output)) 106 | } else { 107 | break; 108 | } 109 | } 110 | } 111 | } 112 | outputs 113 | } 114 | 115 | fn output_is_primary(output: &ComPtr) -> bool { 116 | unsafe { 117 | let mut output_desc = zeroed(); 118 | output.GetDesc(&mut output_desc); 119 | let mut monitor_info: MONITORINFO = zeroed(); 120 | monitor_info.cbSize = mem::size_of::() as u32; 121 | GetMonitorInfoW(output_desc.Monitor, &mut monitor_info); 122 | (monitor_info.dwFlags & 1) != 0 123 | } 124 | } 125 | 126 | fn get_capture_source( 127 | output_dups: Vec<(ComPtr, ComPtr)>, 128 | cs_index: usize, 129 | ) -> Option<(ComPtr, ComPtr)> { 130 | if cs_index == 0 { 131 | output_dups 132 | .into_iter() 133 | .find(|&(_, ref out)| output_is_primary(out)) 134 | } else { 135 | output_dups 136 | .into_iter() 137 | .filter(|&(_, ref out)| !output_is_primary(out)) 138 | .nth(cs_index - 1) 139 | } 140 | } 141 | 142 | fn duplicate_outputs( 143 | mut device: ComPtr, 144 | outputs: Vec>, 145 | ) -> Result< 146 | ( 147 | ComPtr, 148 | Vec<(ComPtr, ComPtr)>, 149 | ), 150 | HRESULT, 151 | > { 152 | let mut out_dups = Vec::new(); 153 | for output in outputs 154 | .into_iter() 155 | .map(|out| out.cast::().unwrap()) 156 | { 157 | let dxgi_device = device.up::(); 158 | let output_duplication = unsafe { 159 | let mut output_duplication = ptr::null_mut(); 160 | let hr = output.DuplicateOutput(dxgi_device.as_raw(), &mut output_duplication); 161 | if hr_failed(hr) { 162 | return Err(hr); 163 | } 164 | ComPtr::from_raw(output_duplication) 165 | }; 166 | device = dxgi_device.cast().unwrap(); 167 | out_dups.push((output_duplication, output)); 168 | } 169 | Ok((device, out_dups)) 170 | } 171 | 172 | struct DuplicatedOutput { 173 | device: ComPtr, 174 | device_context: ComPtr, 175 | output: ComPtr, 176 | output_duplication: ComPtr, 177 | } 178 | impl DuplicatedOutput { 179 | fn get_desc(&self) -> DXGI_OUTPUT_DESC { 180 | unsafe { 181 | let mut desc = zeroed(); 182 | self.output.GetDesc(&mut desc); 183 | desc 184 | } 185 | } 186 | 187 | fn capture_frame_to_surface( 188 | &mut self, 189 | timeout_ms: u32, 190 | ) -> Result, HRESULT> { 191 | let frame_resource = unsafe { 192 | let mut frame_resource = ptr::null_mut(); 193 | let mut frame_info = zeroed(); 194 | let hr = self.output_duplication.AcquireNextFrame( 195 | timeout_ms, 196 | &mut frame_info, 197 | &mut frame_resource, 198 | ); 199 | if hr_failed(hr) { 200 | return Err(hr); 201 | } 202 | ComPtr::from_raw(frame_resource) 203 | }; 204 | let frame_texture = frame_resource.cast::().unwrap(); 205 | let mut texture_desc = unsafe { 206 | let mut texture_desc = zeroed(); 207 | frame_texture.GetDesc(&mut texture_desc); 208 | texture_desc 209 | }; 210 | // Configure the description to make the texture readable 211 | texture_desc.Usage = D3D11_USAGE_STAGING; 212 | texture_desc.BindFlags = 0; 213 | texture_desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ; 214 | texture_desc.MiscFlags = 0; 215 | let readable_texture = unsafe { 216 | let mut readable_texture = ptr::null_mut(); 217 | let hr = 218 | self.device 219 | .CreateTexture2D(&mut texture_desc, ptr::null(), &mut readable_texture); 220 | if hr_failed(hr) { 221 | return Err(hr); 222 | } 223 | ComPtr::from_raw(readable_texture) 224 | }; 225 | // Lower priorities causes stuff to be needlessly copied from gpu to ram, 226 | // causing huge ram usage on some systems. 227 | unsafe { readable_texture.SetEvictionPriority(DXGI_RESOURCE_PRIORITY_MAXIMUM) }; 228 | let readable_surface = readable_texture.up::(); 229 | unsafe { 230 | self.device_context.CopyResource( 231 | readable_surface.as_raw(), 232 | frame_texture.up::().as_raw(), 233 | ); 234 | self.output_duplication.ReleaseFrame(); 235 | } 236 | readable_surface.cast() 237 | } 238 | } 239 | 240 | /// Manager of DXGI duplicated outputs 241 | pub struct DXGIManager { 242 | duplicated_output: Option, 243 | capture_source_index: usize, 244 | timeout_ms: u32, 245 | } 246 | 247 | struct SharedPtr(*const T); 248 | 249 | unsafe impl Send for SharedPtr {} 250 | 251 | unsafe impl Sync for SharedPtr {} 252 | 253 | impl DXGIManager { 254 | /// Construct a new manager with capture timeout 255 | pub fn new(timeout_ms: u32) -> Result { 256 | let mut manager = DXGIManager { 257 | duplicated_output: None, 258 | capture_source_index: 0, 259 | timeout_ms: timeout_ms, 260 | }; 261 | 262 | match manager.acquire_output_duplication() { 263 | Ok(_) => Ok(manager), 264 | Err(_) => Err("Failed to acquire output duplication"), 265 | } 266 | } 267 | 268 | pub fn geometry(&self) -> (usize, usize) { 269 | let output_desc = self.duplicated_output.as_ref().unwrap().get_desc(); 270 | let RECT { 271 | left, 272 | top, 273 | right, 274 | bottom, 275 | } = output_desc.DesktopCoordinates; 276 | ((right - left) as usize, (bottom - top) as usize) 277 | } 278 | 279 | /// Set index of capture source to capture from 280 | pub fn set_capture_source_index(&mut self, cs: usize) { 281 | self.capture_source_index = cs; 282 | self.acquire_output_duplication().unwrap() 283 | } 284 | 285 | pub fn get_capture_source_index(&self) -> usize { 286 | self.capture_source_index 287 | } 288 | 289 | /// Set timeout to use when capturing 290 | pub fn set_timeout_ms(&mut self, timeout_ms: u32) { 291 | self.timeout_ms = timeout_ms 292 | } 293 | 294 | /// Duplicate and acquire output selected by `capture_source_index` 295 | pub fn acquire_output_duplication(&mut self) -> Result<(), ()> { 296 | self.duplicated_output = None; 297 | let factory = create_dxgi_factory_1(); 298 | for (outputs, adapter) in (0..) 299 | .map(|i| { 300 | let mut adapter = ptr::null_mut(); 301 | unsafe { 302 | if factory.EnumAdapters1(i, &mut adapter) != DXGI_ERROR_NOT_FOUND { 303 | Some(ComPtr::from_raw(adapter)) 304 | } else { 305 | None 306 | } 307 | } 308 | }) 309 | .take_while(Option::is_some) 310 | .map(Option::unwrap) 311 | .map(|mut adapter| (get_adapter_outputs(&mut adapter), adapter)) 312 | .filter(|&(ref outs, _)| !outs.is_empty()) 313 | { 314 | // Creating device for each adapter that has the output 315 | let (d3d11_device, device_context) = d3d11_create_device(adapter.up().as_raw()); 316 | let (d3d11_device, output_duplications) = 317 | duplicate_outputs(d3d11_device, outputs).map_err(|_| ())?; 318 | if let Some((output_duplication, output)) = 319 | get_capture_source(output_duplications, self.capture_source_index) 320 | { 321 | self.duplicated_output = Some(DuplicatedOutput { 322 | device: d3d11_device, 323 | device_context: device_context, 324 | output: output, 325 | output_duplication: output_duplication, 326 | }); 327 | return Ok(()); 328 | } 329 | } 330 | Err(()) 331 | } 332 | 333 | fn capture_frame_to_surface(&mut self) -> Result, CaptureError> { 334 | if let None = self.duplicated_output { 335 | if let Ok(_) = self.acquire_output_duplication() { 336 | return Err(CaptureError::Fail("No valid duplicated output")); 337 | } else { 338 | return Err(CaptureError::RefreshFailure); 339 | } 340 | } 341 | let timeout_ms = self.timeout_ms; 342 | match self 343 | .duplicated_output 344 | .as_mut() 345 | .unwrap() 346 | .capture_frame_to_surface(timeout_ms) 347 | { 348 | Ok(surface) => Ok(surface), 349 | Err(DXGI_ERROR_ACCESS_LOST) => { 350 | if let Ok(_) = self.acquire_output_duplication() { 351 | Err(CaptureError::AccessLost) 352 | } else { 353 | Err(CaptureError::RefreshFailure) 354 | } 355 | } 356 | Err(E_ACCESSDENIED) => Err(CaptureError::AccessDenied), 357 | Err(DXGI_ERROR_WAIT_TIMEOUT) => Err(CaptureError::Timeout), 358 | Err(_) => { 359 | if let Ok(_) = self.acquire_output_duplication() { 360 | Err(CaptureError::Fail("Failure when acquiring frame")) 361 | } else { 362 | Err(CaptureError::RefreshFailure) 363 | } 364 | } 365 | } 366 | } 367 | 368 | fn capture_frame_t(&mut self) -> Result<(Vec, (usize, usize)), CaptureError> { 369 | let frame_surface = match self.capture_frame_to_surface() { 370 | Ok(surface) => surface, 371 | Err(e) => return Err(e), 372 | }; 373 | let mapped_surface = unsafe { 374 | let mut mapped_surface = zeroed(); 375 | if hr_failed(frame_surface.Map(&mut mapped_surface, DXGI_MAP_READ)) { 376 | frame_surface.Release(); 377 | return Err(CaptureError::Fail("Failed to map surface")); 378 | } 379 | mapped_surface 380 | }; 381 | let byte_size = |x| x * mem::size_of::() / mem::size_of::(); 382 | let output_desc = self.duplicated_output.as_mut().unwrap().get_desc(); 383 | let stride = mapped_surface.Pitch as usize / mem::size_of::(); 384 | let byte_stride = byte_size(stride); 385 | let (output_width, output_height) = { 386 | let RECT { 387 | left, 388 | top, 389 | right, 390 | bottom, 391 | } = output_desc.DesktopCoordinates; 392 | ((right - left) as usize, (bottom - top) as usize) 393 | }; 394 | let mut pixel_buf = Vec::with_capacity(byte_size(output_width * output_height)); 395 | 396 | let scan_lines = 397 | match output_desc.Rotation { 398 | DXGI_MODE_ROTATION_ROTATE90 | DXGI_MODE_ROTATION_ROTATE270 => output_width, 399 | _ => output_height, 400 | }; 401 | 402 | let mapped_pixels = unsafe { 403 | slice::from_raw_parts( 404 | mapped_surface.pBits as *const T, 405 | byte_stride * scan_lines, 406 | ) 407 | }; 408 | 409 | match output_desc.Rotation { 410 | DXGI_MODE_ROTATION_IDENTITY | DXGI_MODE_ROTATION_UNSPECIFIED => 411 | pixel_buf.extend_from_slice(mapped_pixels), 412 | DXGI_MODE_ROTATION_ROTATE90 => { 413 | unsafe { 414 | let ptr = SharedPtr(pixel_buf.as_ptr() as *const BGRA8); 415 | mapped_pixels.chunks(byte_stride).rev().enumerate().for_each(|(column, chunk)| { 416 | let mut src = chunk.as_ptr() as *const BGRA8; 417 | let mut dst = ptr.0 as *mut BGRA8; 418 | dst = dst.add(column); 419 | let stop = src.add(output_height); 420 | while src != stop { 421 | dst.write(*src); 422 | src = src.add(1); 423 | dst = dst.add(output_width); 424 | } 425 | }); 426 | pixel_buf.set_len(pixel_buf.capacity()); 427 | } 428 | } 429 | DXGI_MODE_ROTATION_ROTATE180 => { 430 | unsafe { 431 | let ptr = SharedPtr(pixel_buf.as_ptr() as *const BGRA8); 432 | mapped_pixels.chunks(byte_stride).rev().enumerate().for_each(|(scan_line, chunk)| { 433 | let mut src = chunk.as_ptr() as *const BGRA8; 434 | let mut dst = ptr.0 as *mut BGRA8; 435 | dst = dst.add(scan_line * output_width); 436 | let stop = src; 437 | src = src.add(output_width); 438 | while src != stop { 439 | src = src.sub(1); 440 | dst.write(*src); 441 | dst = dst.add(1); 442 | } 443 | }); 444 | pixel_buf.set_len(pixel_buf.capacity()); 445 | } 446 | } 447 | DXGI_MODE_ROTATION_ROTATE270 => { 448 | unsafe { 449 | let ptr = SharedPtr(pixel_buf.as_ptr() as *const BGRA8); 450 | mapped_pixels.chunks(byte_stride).enumerate().for_each(|(column, chunk)| { 451 | let mut src = chunk.as_ptr() as *const BGRA8; 452 | let mut dst = ptr.0 as *mut BGRA8; 453 | dst = dst.add(column); 454 | let stop = src; 455 | src = src.add(output_height); 456 | while src != stop { 457 | src = src.sub(1); 458 | dst.write(*src); 459 | dst = dst.add(output_width); 460 | } 461 | }); 462 | pixel_buf.set_len(pixel_buf.capacity()); 463 | } 464 | } 465 | n => unreachable!("Undefined DXGI_MODE_ROTATION: {}", n), 466 | } 467 | unsafe { frame_surface.Unmap() }; 468 | Ok((pixel_buf, (output_width, output_height))) 469 | } 470 | 471 | /// Capture a frame 472 | /// 473 | /// On success, return Vec with pixels and width and height of frame. 474 | /// On failure, return CaptureError. 475 | pub fn capture_frame(&mut self) -> Result<(Vec, (usize, usize)), CaptureError> { 476 | self.capture_frame_t() 477 | } 478 | 479 | /// Capture a frame 480 | /// 481 | /// On success, return Vec with pixel components and width and height of frame. 482 | /// On failure, return CaptureError. 483 | pub fn capture_frame_components(&mut self) -> Result<(Vec, (usize, usize)), CaptureError> { 484 | self.capture_frame_t() 485 | } 486 | } 487 | 488 | #[test] 489 | fn test() { 490 | let mut manager = DXGIManager::new(300).unwrap(); 491 | for _ in 0..100 { 492 | match manager.capture_frame() { 493 | Ok((pixels, (_, _))) => { 494 | let len = pixels.len() as u64; 495 | let (r, g, b) = pixels.into_iter().fold((0u64, 0u64, 0u64), |(r, g, b), p| { 496 | (r + p.r as u64, g + p.g as u64, b + p.b as u64) 497 | }); 498 | println!("avg: {} {} {}", r / len, g / len, b / len) 499 | } 500 | Err(e) => println!("error: {:?}", e), 501 | } 502 | } 503 | } 504 | 505 | #[test] 506 | fn compare_frame_dims() { 507 | let mut manager = DXGIManager::new(300).unwrap(); 508 | let (frame, (fw, fh)) = manager.capture_frame().unwrap(); 509 | let (frame_u8, (fu8w, fu8h)) = manager.capture_frame_components().unwrap(); 510 | assert_eq!(fw, fu8w); 511 | assert_eq!(fh, fu8h); 512 | assert_eq!(4 * frame.len(), frame_u8.len()); 513 | } --------------------------------------------------------------------------------