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galister
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[package]
name = "wlx-capture"
version = "0.5.3"
edition = "2021"
authors = ["galister"]
description = "Screen capture library for Wayland and X11"
repository = "https://github.com/galister/wlx-capture"
keywords = ["desktop", "capture", "pipewire", "wayland", "x11"]
categories = ["computer-vision", "multimedia::images"]
documentation = "https://docs.rs/wlx-capture"
license = "GPL-3.0"
[features]
default = ["wayland", "pipewire"]
egl = []
wlr = ["wayland"]
pipewire = ["wayland", "dep:ashpd", "dep:pipewire"]
wayland = [
"dep:smithay-client-toolkit",
"dep:wayland-client",
"dep:wayland-protocols",
]
xshm = ["dep:rxscreen"]
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
ashpd = { version = "0.11.0", default_features = false, features = [
"async-std",
], optional = true }
drm-fourcc = "2.2.0"
idmap = "0.2.21"
libc = "0.2.171"
log = "0.4.27"
pipewire = { git = "https://gitlab.freedesktop.org/galister/pipewire-rs.git", ref = "ba32202c3c391004c3bb533b58fa75a50e47ff57", features = [
"v0_3_33",
], optional = true }
#pipewire = { version = "0.8.0", features = ["v0_3_33"], optional = true }
rxscreen = { version = "0.1.7", features = [
"shm",
"xrandr",
"mouse",
], optional = true }
smithay-client-toolkit = { version = "0.19.2", optional = true }
wayland-client = { version = "0.31.8", optional = true }
wayland-protocols = { version = "0.32.6", features = [
"wayland-client",
"client",
"staging",
"unstable",
], optional = true }

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Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

78
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# wlx-capture
This aims to be an all-in-one Linux desktop capture solution.
I'm primarily using this for various XR projects.
Supported capture methods:
- Pipewire (MemFd+MemPtr+DmaBuf)
- Wlr-Dmabuf (Sway, Hyprland, River etc)
- XSHM
# Early Development
This project is in a highly experimental state. If you want to talk about this project, find me on:
- Discord: https://discord.gg/gHwJ2vwSWV
- Matrix Space: `#linux-vr-adventures:matrix.org`
# Usage
### Pipewire Setup
```rust
let Ok(node_id) = pipewire_select_screen(None, true, true, true).await else {
return;
};
let capture = PipewireCapture::new(
"wlx-capture", // name of stream
node_id,
60, // fps to give to pipewire, no effect as of writing
);
```
### Wlr-Dmabuf Setup
```rust
let wl = WlxClient::new();
// select desired screen
let output_id = wl.outputs.keys().first().unwrap();
let mut capture = WlrDmabufCapture::new(wl, *output_id).unwrap();
```
### XSHM Setup
```rust
let monitors = XshmCapture::get_monitors();
let mut capture = XshmCapture::new(monitors[0]).unwrap();
```
### Receiving Frames
```rust
let frame_rx = capture.init();
capture.request_new_frame();
loop {
if let Ok(frame) = frame_rx.try_recv() {
match frame {
WlxFrame::DmaBuf(dmabuf_frame) => {
// vulkano: https://github.com/galister/wlx-overlay-s/blob/6ee0cb4fd1bd099a0f22171656f87f85e3f86abd/src/graphics.rs#L740
// egl: https://github.com/galister/wlx-overlay-x/blob/04f5e90cf8248705010beaf35aed3cf22f0e62c1/src/desktop/frame.rs#L255
}
WlxFrame::MemFd(memfd_frame) => {
// egl: https://github.com/galister/wlx-overlay-x/blob/04f5e90cf8248705010beaf35aed3cf22f0e62c1/src/desktop/frame.rs#L207
}
WlxFrame::MemPtr(memptr_frame) => {
// egl: https://github.com/galister/wlx-overlay-x/blob/04f5e90cf8248705010beaf35aed3cf22f0e62c1/src/desktop/frame.rs#L185
}
}
capture.request_new_frame();
}
}
```
Notes:
- `PipewireCapture` will produce frames on its own and doesn't require `request_new_frame`.
- You may call `request_new_frame` at any time after `init` without worrying if a frame capture is already in progress.
- Calling `request_new_frame` when a frame is not ready yet will return and not trigger another frame capture.

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use std::{fmt::Display, os::fd::RawFd};
#[derive(Debug, Clone, Copy, Default)]
pub struct FourCC {
pub value: u32,
}
impl PartialEq for FourCC {
fn eq(&self, other: &Self) -> bool {
self.value == other.value
}
}
impl From<u32> for FourCC {
fn from(value: u32) -> Self {
Self { value }
}
}
impl From<FourCC> for u32 {
fn from(fourcc: FourCC) -> Self {
fourcc.value
}
}
impl Display for FourCC {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
for i in 0..4 {
if let Some(c) = char::from_u32((self.value >> (i * 8)) & 0xFF) {
write!(f, "{}", c)?
} else {
write!(f, "?")?
}
}
Ok(())
}
}
pub const DRM_FORMAT_ARGB8888: u32 = 0x34325241; // AR24
pub const DRM_FORMAT_ABGR8888: u32 = 0x34324241; // AB24
pub const DRM_FORMAT_XRGB8888: u32 = 0x34325258; // XR24
pub const DRM_FORMAT_XBGR8888: u32 = 0x34324258; // XB24
pub const DRM_FORMAT_ABGR2101010: u32 = 0x30334241; // AB30
pub const DRM_FORMAT_XBGR2101010: u32 = 0x30334258; // XB30
#[cfg(feature = "egl")]
#[rustfmt::skip]
const EGL_DMABUF_PLANE_ATTRS: [isize; 20] = [
// FD Offset Stride ModLo ModHi
0x3272,0x3273,0x3274,0x3443,0x3444,
0x3275,0x3276,0x3277,0x3445,0x3446,
0x3278,0x3279,0x327A,0x3447,0x3448,
0x3440,0x3441,0x3442,0x3449,0x344A,
];
pub enum WlxFrame {
Dmabuf(DmabufFrame),
MemFd(MemFdFrame),
MemPtr(MemPtrFrame),
}
#[derive(Debug, Clone, Copy, Default)]
pub enum Transform {
#[default]
Undefined,
Normal,
Rotated90,
Rotated180,
Rotated270,
Flipped,
Flipped90,
Flipped180,
Flipped270,
}
#[derive(Debug, Clone, Copy, Default)]
pub struct FrameFormat {
pub width: u32,
pub height: u32,
pub fourcc: FourCC,
pub modifier: u64,
pub transform: Transform,
}
impl FrameFormat {
pub fn get_mod_hi(&self) -> u32 {
(self.modifier >> 32) as _
}
pub fn get_mod_lo(&self) -> u32 {
(self.modifier & 0xFFFFFFFF) as _
}
pub fn set_mod(&mut self, mod_hi: u32, mod_low: u32) {
self.modifier = ((mod_hi as u64) << 32) + mod_low as u64;
}
}
#[derive(Clone, Copy, Default)]
pub struct FramePlane {
pub fd: Option<RawFd>,
pub offset: u32,
pub stride: i32,
}
#[derive(Default, Clone)]
pub struct DrmFormat {
pub fourcc: FourCC,
pub modifiers: Vec<u64>,
}
#[derive(Default)]
pub struct DmabufFrame {
pub format: FrameFormat,
pub num_planes: usize,
pub planes: [FramePlane; 4],
pub mouse: Option<MouseMeta>,
}
impl DmabufFrame {
#[cfg(feature = "egl")]
/// Get the attributes for creating an EGLImage.
/// Pacics if fd is None; check using `is_valid` first.
pub fn get_egl_image_attribs(&self) -> Vec<isize> {
let mut vec: Vec<isize> = vec![
0x3057, // WIDTH
self.format.width as _,
0x3056, // HEIGHT
self.format.height as _,
0x3271, // LINUX_DRM_FOURCC_EXT,
self.format.fourcc.value as _,
];
for i in 0..self.num_planes {
let mut a = i * 5usize;
vec.push(EGL_DMABUF_PLANE_ATTRS[a]);
vec.push(self.planes[i].fd.unwrap() as _); // safe to unwrap due to contract
a += 1;
vec.push(EGL_DMABUF_PLANE_ATTRS[a]);
vec.push(self.planes[i].offset as _);
a += 1;
vec.push(EGL_DMABUF_PLANE_ATTRS[a]);
vec.push(self.planes[i].stride as _);
a += 1;
vec.push(EGL_DMABUF_PLANE_ATTRS[a]);
vec.push(self.format.get_mod_lo() as _);
a += 1;
vec.push(EGL_DMABUF_PLANE_ATTRS[a]);
vec.push(self.format.get_mod_hi() as _);
}
vec.push(0x3038); // NONE
vec
}
/// Returns true if all planes have a valid file descriptor.
pub fn is_valid(&self) -> bool {
for i in 0..self.num_planes {
if self.planes[i].fd.is_none() {
return false;
}
}
true
}
}
#[derive(Default)]
pub struct MemFdFrame {
pub format: FrameFormat,
pub plane: FramePlane,
pub mouse: Option<MouseMeta>,
}
#[derive(Default)]
pub struct MemPtrFrame {
pub format: FrameFormat,
pub ptr: usize,
pub size: usize,
pub mouse: Option<MouseMeta>,
}
#[derive(Default, Clone)]
pub struct MouseMeta {
pub x: f32,
pub y: f32,
}

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#![allow(dead_code)]
use frame::{DrmFormat, WlxFrame};
pub mod frame;
#[cfg(feature = "wayland")]
pub mod wayland;
#[cfg(feature = "wlr")]
pub mod wlr_dmabuf;
#[cfg(feature = "wlr")]
pub mod wlr_screencopy;
#[cfg(feature = "pipewire")]
pub mod pipewire;
#[cfg(feature = "xshm")]
pub mod xshm;
pub trait WlxCapture<U, R> {
fn init(
&mut self,
dmabuf_formats: &[DrmFormat],
user_data: U,
callback: fn(&U, WlxFrame) -> Option<R>,
);
fn is_ready(&self) -> bool;
fn supports_dmbuf(&self) -> bool;
fn receive(&mut self) -> Option<R>;
fn pause(&mut self);
fn resume(&mut self);
fn request_new_frame(&mut self);
}

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use std::any::Any;
use std::sync::atomic::AtomicU32;
use std::sync::atomic::Ordering;
use std::sync::mpsc;
use std::sync::Arc;
use std::thread::JoinHandle;
use ashpd::desktop::{
screencast::{CursorMode, Screencast, SourceType},
PersistMode,
};
pub use ashpd::Error as AshpdError;
use pipewire as pw;
use pw::spa;
use pw::properties::properties;
use pw::stream::{Stream, StreamFlags};
use pw::{context::Context, main_loop::MainLoop, Error};
use spa::buffer::DataType;
use spa::buffer::MetaData;
use spa::buffer::MetaType;
use spa::param::video::VideoFormat;
use spa::param::video::VideoInfoRaw;
use spa::param::ParamType;
use spa::pod::serialize::GenError;
use spa::pod::ChoiceValue;
use spa::pod::Pod;
use spa::pod::{Object, Property, PropertyFlags, Value};
use spa::utils::Choice;
use spa::utils::ChoiceEnum;
use spa::utils::ChoiceFlags;
use crate::frame::DrmFormat;
use crate::frame::FourCC;
use crate::frame::FrameFormat;
use crate::frame::MouseMeta;
use crate::frame::Transform;
use crate::frame::WlxFrame;
use crate::frame::DRM_FORMAT_ABGR2101010;
use crate::frame::DRM_FORMAT_ABGR8888;
use crate::frame::DRM_FORMAT_ARGB8888;
use crate::frame::DRM_FORMAT_XBGR2101010;
use crate::frame::DRM_FORMAT_XBGR8888;
use crate::frame::DRM_FORMAT_XRGB8888;
use crate::frame::{DmabufFrame, FramePlane, MemFdFrame, MemPtrFrame};
use crate::WlxCapture;
pub struct PipewireStream {
pub node_id: u32,
pub position: Option<(i32, i32)>,
pub size: Option<(i32, i32)>,
}
pub struct PipewireSelectScreenResult {
pub streams: Vec<PipewireStream>,
pub restore_token: Option<String>,
}
pub async fn pipewire_select_screen(
token: Option<&str>,
embed_mouse: bool,
screens_only: bool,
persist: bool,
multiple: bool,
) -> Result<PipewireSelectScreenResult, AshpdError> {
static CURSOR_MODES: AtomicU32 = AtomicU32::new(0);
let proxy = Screencast::new().await?;
let session = proxy.create_session().await?;
let mut cursor_modes = CURSOR_MODES.load(Ordering::Relaxed);
if cursor_modes == 0 {
cursor_modes = proxy.get_property::<u32>("AvailableCursorModes").await?;
log::debug!("Available cursor modes: {cursor_modes:#x}");
// propery will be same system-wide, so race condition not a concern
CURSOR_MODES.store(cursor_modes, Ordering::Relaxed);
}
let cursor_mode = match embed_mouse {
true if cursor_modes & (CursorMode::Embedded as u32) != 0 => CursorMode::Embedded,
_ if cursor_modes & (CursorMode::Metadata as u32) != 0 => CursorMode::Metadata,
_ => CursorMode::Hidden,
};
log::debug!("Selected cursor mode: {cursor_mode:?}");
let source_type = if screens_only {
SourceType::Monitor.into()
} else {
SourceType::Monitor | SourceType::Window | SourceType::Virtual
};
let persist_mode = if persist {
PersistMode::ExplicitlyRevoked
} else {
PersistMode::DoNot
};
proxy
.select_sources(
&session,
cursor_mode,
source_type,
multiple,
token,
persist_mode,
)
.await?;
let response = proxy.start(&session, None).await?.response()?;
let streams: Vec<_> = response
.streams()
.iter()
.map(|stream| PipewireStream {
node_id: stream.pipe_wire_node_id(),
position: stream.position(),
size: stream.size(),
})
.collect();
if !streams.is_empty() {
return Ok(PipewireSelectScreenResult {
streams,
restore_token: response.restore_token().map(String::from),
});
}
Err(ashpd::Error::NoResponse)
}
#[derive(Default)]
struct StreamData {
format: Option<FrameFormat>,
stream: Option<Stream>,
}
pub enum PwChangeRequest {
Pause,
Resume,
Stop,
}
struct CaptureData<R>
where
R: Any + Send,
{
tx_ctrl: pw::channel::Sender<PwChangeRequest>,
rx_frame: mpsc::Receiver<R>,
}
pub struct PipewireCapture<R>
where
R: Any + Send,
{
name: Arc<str>,
data: Option<CaptureData<R>>,
node_id: u32,
handle: Option<JoinHandle<Result<(), Error>>>,
}
impl<R> PipewireCapture<R>
where
R: Any + Send,
{
pub fn new(name: Arc<str>, node_id: u32) -> Self {
PipewireCapture {
name,
data: None,
node_id,
handle: None,
}
}
}
impl<R> Drop for PipewireCapture<R>
where
R: Any + Send,
{
fn drop(&mut self) {
if let Some(data) = &self.data {
let _ = data.tx_ctrl.send(PwChangeRequest::Stop);
}
if let Some(handle) = self.handle.take() {
let _ = handle.join();
}
}
}
impl<U, R> WlxCapture<U, R> for PipewireCapture<R>
where
U: Any + Send,
R: Any + Send,
{
fn init(
&mut self,
dmabuf_formats: &[DrmFormat],
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
) {
let (tx_frame, rx_frame) = mpsc::sync_channel(2);
let (tx_ctrl, rx_ctrl) = pw::channel::channel();
self.data = Some(CaptureData { tx_ctrl, rx_frame });
self.handle = Some(std::thread::spawn({
let name = self.name.clone();
let node_id = self.node_id;
let formats = dmabuf_formats.to_vec();
move || {
main_loop::<U, R>(
name,
node_id,
formats,
tx_frame,
rx_ctrl,
user_data,
receive_callback,
)
}
}));
}
fn is_ready(&self) -> bool {
self.data.is_some()
}
fn supports_dmbuf(&self) -> bool {
true
}
fn receive(&mut self) -> Option<R> {
if let Some(data) = self.data.as_ref() {
return data.rx_frame.try_iter().last();
}
None
}
fn pause(&mut self) {
if let Some(data) = &self.data {
match data.tx_ctrl.send(PwChangeRequest::Pause) {
Ok(_) => (),
Err(_) => {
log::warn!("{}: disconnected, stopping stream", &self.name);
}
}
}
}
fn resume(&mut self) {
if let Some(data) = &self.data {
match data.tx_ctrl.send(PwChangeRequest::Resume) {
Ok(_) => {
log::debug!(
"{}: dropped {} old frames before resuming",
&self.name,
data.rx_frame.try_iter().count()
);
}
Err(_) => {
log::warn!("{}: disconnected, stopping stream", &self.name);
}
}
}
}
fn request_new_frame(&mut self) {}
}
fn main_loop<U, R>(
name: Arc<str>,
node_id: u32,
dmabuf_formats: Vec<DrmFormat>,
sender: mpsc::SyncSender<R>,
receiver: pw::channel::Receiver<PwChangeRequest>,
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
) -> Result<(), Error>
where
U: Any,
R: Any,
{
let main_loop = MainLoop::new(None)?;
let context = Context::new(&main_loop)?;
let core = context.connect(None)?;
let stream = Stream::new(
&core,
&name,
properties! {
*pw::keys::MEDIA_TYPE => "Video",
*pw::keys::MEDIA_CATEGORY => "Capture",
*pw::keys::MEDIA_ROLE => "Screen",
},
)?;
let _listener = stream
.add_local_listener_with_user_data(FrameFormat::default())
.state_changed({
let name = name.clone();
move |_, _, old, new| {
log::info!("{}: stream state changed: {:?} -> {:?}", &name, old, new);
}
})
.param_changed({
let name = name.clone();
move |stream, format, id, param| {
let Some(param) = param else {
return;
};
if id != ParamType::Format.as_raw() {
return;
}
let mut info = VideoInfoRaw::default();
info.parse(param)
.expect("Failed to parse param changed to VideoInfoRaw");
format.width = info.size().width;
format.height = info.size().height;
format.fourcc = spa_to_fourcc(info.format());
format.modifier = info.modifier();
let kind = if format.modifier != 0 {
"DMA-buf"
} else {
"SHM"
};
log::info!("{}: got {} video format:", &name, &kind);
log::info!(" format: {} ({:?})", info.format().as_raw(), info.format());
log::info!(" size: {}x{}", info.size().width, info.size().height);
log::info!(" modifier: {}", info.modifier());
let Ok(params_bytes) = obj_to_bytes(get_buffer_params()) else {
log::warn!("{}: failed to serialize buffer params", &name);
return;
};
let Some(params_pod) = Pod::from_bytes(&params_bytes) else {
log::warn!("{}: failed to deserialize buffer params", &name);
return;
};
let header_bytes = obj_to_bytes(get_meta_object(
spa::sys::SPA_META_Header,
std::mem::size_of::<spa::sys::spa_meta_header>(),
))
.unwrap(); // want panic
let header_pod = Pod::from_bytes(&header_bytes).unwrap(); // want panic
let xform_bytes = obj_to_bytes(get_meta_object(
spa::sys::SPA_META_VideoTransform,
std::mem::size_of::<spa::sys::spa_meta_videotransform>(),
))
.unwrap(); // want panic
let xform_pod = Pod::from_bytes(&xform_bytes).unwrap(); // want panic
let mut pods = [params_pod, header_pod, xform_pod];
if let Err(e) = stream.update_params(&mut pods) {
log::error!("{}: failed to update params: {}", &name, e);
}
}
})
.process({
let name = name.clone();
let u = user_data;
move |stream, format| {
let mut maybe_buffer = None;
// discard all but the newest frame
while let Some(buffer) = stream.dequeue_buffer() {
maybe_buffer = Some(buffer);
}
if let Some(mut buffer) = maybe_buffer {
if let MetaData::Header(header) = buffer.find_meta_data(MetaType::Header) {
if header.flags & spa::sys::SPA_META_HEADER_FLAG_CORRUPTED != 0 {
log::warn!("{}: PipeWire buffer is corrupt.", &name);
return;
}
}
if let MetaData::VideoTransform(transform) =
buffer.find_meta_data(MetaType::VideoTransform)
{
format.transform = match transform.transform {
spa::sys::SPA_META_TRANSFORMATION_None => Transform::Normal,
spa::sys::SPA_META_TRANSFORMATION_90 => Transform::Rotated90,
spa::sys::SPA_META_TRANSFORMATION_180 => Transform::Rotated180,
spa::sys::SPA_META_TRANSFORMATION_270 => Transform::Rotated270,
spa::sys::SPA_META_TRANSFORMATION_Flipped => Transform::Flipped,
spa::sys::SPA_META_TRANSFORMATION_Flipped90 => Transform::Flipped90,
spa::sys::SPA_META_TRANSFORMATION_Flipped180 => Transform::Flipped180,
spa::sys::SPA_META_TRANSFORMATION_Flipped270 => Transform::Flipped270,
_ => Transform::Undefined,
};
log::debug!("{}: Transform: {:?}", &name, &format.transform);
}
let mouse_meta = match buffer.find_meta_data(MetaType::Cursor) {
MetaData::Cursor(cursor) if cursor.id != 0 => Some(MouseMeta {
x: cursor.position.x as f32 / format.width as f32,
y: cursor.position.y as f32 / format.height as f32,
}),
_ => None,
};
let datas = buffer.datas_mut();
if datas.is_empty() {
log::debug!("{}: no data", &name);
return;
}
let planes: Vec<FramePlane> = datas
.iter()
.map(|p| FramePlane {
fd: Some(p.as_raw().fd as _),
offset: p.chunk().offset(),
stride: p.chunk().stride(),
})
.collect();
match datas[0].type_() {
DataType::DmaBuf => {
let mut dmabuf = DmabufFrame {
format: *format,
num_planes: planes.len(),
mouse: mouse_meta,
..Default::default()
};
dmabuf.planes[..planes.len()].copy_from_slice(&planes[..planes.len()]);
let frame = WlxFrame::Dmabuf(dmabuf);
if let Some(r) = receive_callback(&u, frame) {
match sender.try_send(r) {
Ok(_) => (),
Err(mpsc::TrySendError::Full(_)) => (),
Err(mpsc::TrySendError::Disconnected(_)) => {
log::warn!("{}: disconnected, stopping stream", &name);
let _ = stream.disconnect();
}
}
}
}
DataType::MemFd => {
let memfd = MemFdFrame {
format: *format,
plane: FramePlane {
fd: Some(datas[0].as_raw().fd as _),
offset: datas[0].chunk().offset(),
stride: datas[0].chunk().stride(),
},
mouse: mouse_meta,
};
let frame = WlxFrame::MemFd(memfd);
if let Some(r) = receive_callback(&u, frame) {
match sender.try_send(r) {
Ok(_) => (),
Err(mpsc::TrySendError::Full(_)) => (),
Err(mpsc::TrySendError::Disconnected(_)) => {
log::warn!("{}: disconnected, stopping stream", &name);
let _ = stream.disconnect();
}
}
}
}
DataType::MemPtr => {
let memptr = MemPtrFrame {
format: *format,
ptr: datas[0].as_raw().data as _,
size: datas[0].chunk().size() as _,
mouse: mouse_meta,
};
let frame = WlxFrame::MemPtr(memptr);
if let Some(r) = receive_callback(&u, frame) {
match sender.try_send(r) {
Ok(_) => (),
Err(mpsc::TrySendError::Full(_)) => (),
Err(mpsc::TrySendError::Disconnected(_)) => {
log::warn!("{}: disconnected, stopping stream", &name);
let _ = stream.disconnect();
}
}
}
}
_ => {
log::error!("Received invalid frame data type ({:?})", datas[0].type_())
}
}
}
}
})
.register()?;
let mut format_params: Vec<Vec<u8>> = dmabuf_formats
.iter()
.filter_map(|f| obj_to_bytes(get_format_params(Some(f))).ok())
.collect();
format_params.push(obj_to_bytes(get_format_params(None)).unwrap()); // safe unwrap: known
// good values
let mut params: Vec<&Pod> = format_params
.iter()
.filter_map(|bytes| Pod::from_bytes(bytes))
.collect();
stream.connect(
spa::utils::Direction::Input,
Some(node_id),
StreamFlags::AUTOCONNECT | StreamFlags::MAP_BUFFERS,
params.as_mut_slice(),
)?;
let _receiver = receiver.attach(main_loop.loop_(), {
let name = name.clone();
let main_loop = main_loop.clone();
move |req| match req {
PwChangeRequest::Pause => {
let _ = stream.set_active(false);
}
PwChangeRequest::Resume => {
let _ = stream.set_active(true);
}
PwChangeRequest::Stop => {
main_loop.quit();
log::info!("{}: stopping pipewire loop", &name);
}
}
});
main_loop.run();
log::info!("{}: pipewire loop exited", &name);
Ok::<(), Error>(())
}
fn obj_to_bytes(obj: spa::pod::Object) -> Result<Vec<u8>, GenError> {
Ok(spa::pod::serialize::PodSerializer::serialize(
std::io::Cursor::new(Vec::new()),
&spa::pod::Value::Object(obj),
)?
.0
.into_inner())
}
fn get_buffer_params() -> Object {
let data_types = (1 << DataType::MemFd.as_raw())
| (1 << DataType::MemPtr.as_raw())
| (1 << DataType::DmaBuf.as_raw());
let property = Property {
key: spa::sys::SPA_PARAM_BUFFERS_dataType,
flags: PropertyFlags::empty(),
value: Value::Int(data_types),
};
spa::pod::object!(
spa::utils::SpaTypes::ObjectParamBuffers,
spa::param::ParamType::Buffers,
property,
)
}
fn get_meta_object(key: u32, size: usize) -> Object {
let meta_type_property = Property {
key: spa::sys::SPA_PARAM_META_type,
flags: PropertyFlags::empty(),
value: Value::Id(spa::utils::Id(key)),
};
let meta_size_property = Property {
key: spa::sys::SPA_PARAM_META_size,
flags: PropertyFlags::empty(),
value: Value::Int(size as i32),
};
spa::pod::object!(
spa::utils::SpaTypes::ObjectParamMeta,
spa::param::ParamType::Meta,
meta_type_property,
meta_size_property,
)
}
fn get_format_params(fmt: Option<&DrmFormat>) -> Object {
let mut obj = spa::pod::object!(
spa::utils::SpaTypes::ObjectParamFormat,
spa::param::ParamType::EnumFormat,
spa::pod::property!(
spa::param::format::FormatProperties::MediaType,
Id,
spa::param::format::MediaType::Video
),
spa::pod::property!(
spa::param::format::FormatProperties::MediaSubtype,
Id,
spa::param::format::MediaSubtype::Raw
),
spa::pod::property!(
spa::param::format::FormatProperties::VideoSize,
Choice,
Range,
Rectangle,
spa::utils::Rectangle {
width: 256,
height: 256,
},
spa::utils::Rectangle {
width: 1,
height: 1,
},
spa::utils::Rectangle {
width: 8192,
height: 8192,
}
),
spa::pod::property!(
spa::param::format::FormatProperties::VideoFramerate,
Choice,
Range,
Fraction,
spa::utils::Fraction { num: 0, denom: 1 },
spa::utils::Fraction { num: 0, denom: 1 },
spa::utils::Fraction {
num: 1000,
denom: 1
}
),
);
if let Some(fmt) = fmt {
let spa_fmt = fourcc_to_spa(fmt.fourcc);
let prop = spa::pod::property!(
spa::param::format::FormatProperties::VideoFormat,
Choice,
Enum,
Id,
spa_fmt,
spa_fmt,
);
obj.properties.push(prop);
// TODO rewrite when property macro supports Long
let prop = Property {
key: spa::param::format::FormatProperties::VideoModifier.as_raw(),
flags: PropertyFlags::MANDATORY | PropertyFlags::DONT_FIXATE,
value: Value::Choice(ChoiceValue::Long(Choice(
ChoiceFlags::empty(),
ChoiceEnum::Enum {
default: fmt.modifiers[0] as _,
alternatives: fmt.modifiers.iter().map(|m| *m as _).collect(),
},
))),
};
obj.properties.push(prop);
} else {
let prop = spa::pod::property!(
spa::param::format::FormatProperties::VideoFormat,
Choice,
Enum,
Id,
spa::param::video::VideoFormat::RGBA,
spa::param::video::VideoFormat::RGBA,
spa::param::video::VideoFormat::BGRA,
spa::param::video::VideoFormat::RGBx,
spa::param::video::VideoFormat::BGRx,
spa::param::video::VideoFormat::ABGR_210LE,
spa::param::video::VideoFormat::xBGR_210LE,
);
obj.properties.push(prop);
}
obj
}
fn fourcc_to_spa(fourcc: FourCC) -> VideoFormat {
match fourcc.value {
DRM_FORMAT_ARGB8888 => VideoFormat::BGRA,
DRM_FORMAT_ABGR8888 => VideoFormat::RGBA,
DRM_FORMAT_XRGB8888 => VideoFormat::BGRx,
DRM_FORMAT_XBGR8888 => VideoFormat::RGBx,
DRM_FORMAT_ABGR2101010 => VideoFormat::ABGR_210LE,
DRM_FORMAT_XBGR2101010 => VideoFormat::xBGR_210LE,
_ => panic!("Unsupported format"),
}
}
#[allow(non_upper_case_globals)]
fn spa_to_fourcc(spa: VideoFormat) -> FourCC {
match spa {
VideoFormat::BGRA => DRM_FORMAT_ARGB8888.into(),
VideoFormat::RGBA => DRM_FORMAT_ABGR8888.into(),
VideoFormat::BGRx => DRM_FORMAT_XRGB8888.into(),
VideoFormat::RGBx => DRM_FORMAT_XBGR8888.into(),
VideoFormat::ABGR_210LE => DRM_FORMAT_ABGR2101010.into(),
VideoFormat::xBGR_210LE => DRM_FORMAT_XBGR2101010.into(),
_ => panic!("Unsupported format"),
}
}

428
wlx-capture/src/wayland.rs Normal file
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use std::{
collections::VecDeque,
sync::{Arc, Mutex},
};
use idmap::IdMap;
use log::debug;
use smithay_client_toolkit::reexports::{
protocols::xdg::xdg_output::zv1::client::{
zxdg_output_manager_v1::ZxdgOutputManagerV1,
zxdg_output_v1::{self, ZxdgOutputV1},
},
protocols_wlr::{
export_dmabuf::v1::client::zwlr_export_dmabuf_manager_v1::ZwlrExportDmabufManagerV1,
screencopy::v1::client::zwlr_screencopy_manager_v1::ZwlrScreencopyManagerV1,
},
};
pub use wayland_client;
use wayland_client::{
backend::WaylandError,
globals::{registry_queue_init, GlobalList, GlobalListContents},
protocol::{
wl_output::{self, Transform, WlOutput},
wl_registry::{self, WlRegistry},
wl_seat::WlSeat,
wl_shm::WlShm,
},
Connection, Dispatch, EventQueue, Proxy, QueueHandle,
};
pub enum OutputChangeEvent {
/// New output has been created.
Create(u32),
/// Logical position or size has changed, but no changes required in terms of rendering.
Logical(u32),
/// Resolution or transform has changed, textures need to be recreated.
Physical(u32),
/// Output has been destroyed.
Destroy(u32),
}
pub struct WlxOutput {
pub wl_output: WlOutput,
pub id: u32,
pub name: Arc<str>,
pub make: Arc<str>,
pub model: Arc<str>,
pub size: (i32, i32),
pub logical_pos: (i32, i32),
pub logical_size: (i32, i32),
pub transform: Transform,
done: bool,
}
pub struct WlxClient {
pub connection: Arc<Connection>,
pub xdg_output_mgr: ZxdgOutputManagerV1,
pub maybe_wlr_dmabuf_mgr: Option<ZwlrExportDmabufManagerV1>,
pub maybe_wlr_screencopy_mgr: Option<ZwlrScreencopyManagerV1>,
pub wl_seat: WlSeat,
pub wl_shm: WlShm,
pub outputs: IdMap<u32, WlxOutput>,
pub queue: Arc<Mutex<EventQueue<Self>>>,
pub globals: GlobalList,
pub queue_handle: QueueHandle<Self>,
default_output_name: Arc<str>,
events: VecDeque<OutputChangeEvent>,
}
impl WlxClient {
pub fn new() -> Option<Self> {
let connection = Connection::connect_to_env()
.inspect_err(|e| log::info!("Wayland connection: {e:?}"))
.ok()?;
let (globals, queue) = registry_queue_init::<Self>(&connection)
.inspect_err(|e| log::info!("Wayland queue init: {e:?}"))
.ok()?;
let qh = queue.handle();
let mut state = Self {
connection: Arc::new(connection),
xdg_output_mgr: globals
.bind(&qh, 2..=3, ())
.expect(ZxdgOutputManagerV1::interface().name),
wl_seat: globals
.bind(&qh, 4..=9, ())
.expect(WlSeat::interface().name),
wl_shm: globals.bind(&qh, 1..=1, ()).expect(WlShm::interface().name),
maybe_wlr_dmabuf_mgr: globals.bind(&qh, 1..=1, ()).ok(),
maybe_wlr_screencopy_mgr: globals.bind(&qh, 2..=2, ()).ok(),
outputs: IdMap::new(),
queue: Arc::new(Mutex::new(queue)),
globals,
queue_handle: qh,
default_output_name: "Unknown".into(),
events: VecDeque::new(),
};
for o in state.globals.contents().clone_list().iter() {
if o.interface == WlOutput::interface().name {
state.add_output(o.name, o.version);
}
}
state.dispatch();
Some(state)
}
fn add_output(&mut self, name: u32, version: u32) {
let wl_output: WlOutput =
self.globals
.registry()
.bind(name, version, &self.queue_handle, name);
self.xdg_output_mgr
.get_xdg_output(&wl_output, &self.queue_handle, name);
let output = WlxOutput {
wl_output,
id: name,
name: self.default_output_name.clone(),
make: self.default_output_name.clone(),
model: self.default_output_name.clone(),
size: (0, 0),
logical_pos: (0, 0),
logical_size: (0, 0),
transform: Transform::Normal,
done: false,
};
self.outputs.insert(name, output);
}
pub fn get_desktop_origin(&self) -> (i32, i32) {
let mut origin = (i32::MAX, i32::MAX);
for output in self.outputs.values() {
origin.0 = origin.0.min(output.logical_pos.0);
origin.1 = origin.1.min(output.logical_pos.1);
}
origin
}
/// Get the logical width and height of the desktop.
pub fn get_desktop_extent(&self) -> (i32, i32) {
let mut extent = (0, 0);
for output in self.outputs.values() {
extent.0 = extent.0.max(output.logical_pos.0 + output.logical_size.0);
extent.1 = extent.1.max(output.logical_pos.1 + output.logical_size.1);
}
let origin = self.get_desktop_origin();
(extent.0 - origin.0, extent.1 - origin.1)
}
pub fn iter_events(&mut self) -> impl Iterator<Item = OutputChangeEvent> + '_ {
self.events.drain(..)
}
/// Dispatch pending events and block until finished.
pub fn dispatch(&mut self) {
if let Ok(mut queue_mut) = self.queue.clone().lock() {
let _ = queue_mut.blocking_dispatch(self);
}
}
/// Dispatch pending events without blocking.
pub fn dispatch_pending(&mut self) {
if let Ok(mut queue_mut) = self.queue.clone().lock() {
if let Some(reader) = queue_mut.prepare_read() {
match reader.read() {
Ok(n) => match queue_mut.dispatch_pending(self) {
Ok(n2) => {
log::debug!("Read {}, dispatched {} pending events", n, n2);
}
Err(err) => {
log::warn!("Error while dispatching {} pending events: {:?}", n, err);
}
},
Err(err) => {
if let WaylandError::Io(ref e) = err {
if e.kind() == std::io::ErrorKind::WouldBlock {
return;
}
}
log::warn!("Error while reading from event queue: {:?}", err);
}
}
} else {
let _ = queue_mut.dispatch_pending(self);
}
}
}
}
pub(crate) fn wl_transform_to_frame_transform(transform: Transform) -> crate::frame::Transform {
match transform {
Transform::Normal => crate::frame::Transform::Normal,
Transform::_90 => crate::frame::Transform::Rotated90,
Transform::_180 => crate::frame::Transform::Rotated180,
Transform::_270 => crate::frame::Transform::Rotated270,
Transform::Flipped => crate::frame::Transform::Flipped,
Transform::Flipped90 => crate::frame::Transform::Flipped90,
Transform::Flipped180 => crate::frame::Transform::Flipped180,
Transform::Flipped270 => crate::frame::Transform::Flipped270,
_ => crate::frame::Transform::Undefined,
}
}
impl Dispatch<ZxdgOutputV1, u32> for WlxClient {
fn event(
state: &mut Self,
_proxy: &ZxdgOutputV1,
event: <ZxdgOutputV1 as Proxy>::Event,
data: &u32,
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
fn finalize_output(output: &mut WlxOutput) {
if output.logical_size.0 < 0 {
output.logical_pos.0 += output.logical_size.0;
output.logical_size.0 *= -1;
}
if output.logical_size.1 < 0 {
output.logical_pos.1 += output.logical_size.1;
output.logical_size.1 *= -1;
}
if !output.done {
output.done = true;
debug!(
"Discovered WlOutput {}; Size: {:?}; Logical Size: {:?}; Pos: {:?}",
output.name, output.size, output.logical_size, output.logical_pos
);
}
}
match event {
zxdg_output_v1::Event::Name { name } => {
if let Some(output) = state.outputs.get_mut(*data) {
output.name = name.into();
}
}
zxdg_output_v1::Event::LogicalPosition { x, y } => {
if let Some(output) = state.outputs.get_mut(*data) {
output.logical_pos = (x, y);
let was_done = output.done;
if output.logical_size != (0, 0) {
finalize_output(output);
}
if was_done {
log::info!(
"{}: Logical pos changed to {:?}",
output.name,
output.logical_pos,
);
state.events.push_back(OutputChangeEvent::Logical(*data));
} else {
state.events.push_back(OutputChangeEvent::Create(*data));
}
}
}
zxdg_output_v1::Event::LogicalSize { width, height } => {
if let Some(output) = state.outputs.get_mut(*data) {
output.logical_size = (width, height);
let was_done = output.done;
if output.logical_pos != (0, 0) {
finalize_output(output);
}
if was_done {
log::info!(
"{}: Logical size changed to {:?}",
output.name,
output.logical_size,
);
state.events.push_back(OutputChangeEvent::Logical(*data));
} else {
state.events.push_back(OutputChangeEvent::Create(*data));
}
}
}
_ => {}
}
}
}
impl Dispatch<WlOutput, u32> for WlxClient {
fn event(
state: &mut Self,
_proxy: &WlOutput,
event: <WlOutput as Proxy>::Event,
data: &u32,
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
match event {
wl_output::Event::Mode { width, height, .. } => {
if let Some(output) = state.outputs.get_mut(*data) {
output.size = (width, height);
if output.done {
log::info!(
"{}: Resolution changed {:?} -> {:?}",
output.name,
output.size,
(width, height)
);
state.events.push_back(OutputChangeEvent::Physical(*data));
}
}
}
wl_output::Event::Geometry {
make,
model,
transform,
..
} => {
if let Some(output) = state.outputs.get_mut(*data) {
let transform = transform.into_result().unwrap_or(Transform::Normal);
let old_transform = output.transform;
output.transform = transform;
if output.done && old_transform != transform {
log::info!(
"{}: Transform changed {:?} -> {:?}",
output.name,
output.transform,
transform
);
state.events.push_back(OutputChangeEvent::Physical(*data));
state.events.push_back(OutputChangeEvent::Logical(*data));
}
output.make = make.into();
output.model = model.into();
}
}
_ => {}
}
}
}
impl Dispatch<WlRegistry, GlobalListContents> for WlxClient {
fn event(
state: &mut Self,
_proxy: &WlRegistry,
event: <WlRegistry as Proxy>::Event,
_data: &GlobalListContents,
conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
match event {
wl_registry::Event::Global {
name,
interface,
version,
} => {
if interface == WlOutput::interface().name {
state.add_output(name, version);
let _ = conn.roundtrip();
}
}
wl_registry::Event::GlobalRemove { name } => {
if let Some(output) = state.outputs.remove(name) {
log::info!("{}: Device removed", output.name);
state.events.push_back(OutputChangeEvent::Destroy(name));
}
}
_ => {}
}
}
}
// Plumbing below
impl Dispatch<ZxdgOutputManagerV1, ()> for WlxClient {
fn event(
_state: &mut Self,
_proxy: &ZxdgOutputManagerV1,
_event: <ZxdgOutputManagerV1 as Proxy>::Event,
_data: &(),
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
}
}
impl Dispatch<ZwlrExportDmabufManagerV1, ()> for WlxClient {
fn event(
_state: &mut Self,
_proxy: &ZwlrExportDmabufManagerV1,
_event: <ZwlrExportDmabufManagerV1 as Proxy>::Event,
_data: &(),
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
}
}
impl Dispatch<ZwlrScreencopyManagerV1, ()> for WlxClient {
fn event(
_state: &mut Self,
_proxy: &ZwlrScreencopyManagerV1,
_event: <ZwlrScreencopyManagerV1 as Proxy>::Event,
_data: &(),
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
}
}
impl Dispatch<WlSeat, ()> for WlxClient {
fn event(
_state: &mut Self,
_proxy: &WlSeat,
_event: <WlSeat as Proxy>::Event,
_data: &(),
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
}
}
impl Dispatch<WlShm, ()> for WlxClient {
fn event(
_state: &mut Self,
_proxy: &WlShm,
_event: <WlShm as Proxy>::Event,
_data: &(),
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
}
}

243
wlx-capture/src/wlr_dmabuf.rs Normal file
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use std::{
any::Any,
collections::VecDeque,
os::fd::{FromRawFd, IntoRawFd, OwnedFd, RawFd},
sync::mpsc,
thread::JoinHandle,
};
use smithay_client_toolkit::reexports::protocols_wlr::export_dmabuf::v1::client::zwlr_export_dmabuf_frame_v1::{self, ZwlrExportDmabufFrameV1};
use wayland_client::{Connection, QueueHandle, Dispatch, Proxy};
use crate::{
frame::{DmabufFrame, DrmFormat, FramePlane, WlxFrame},
wayland::{wl_transform_to_frame_transform, WlxClient},
WlxCapture,
};
use log::{debug, warn};
struct CaptureData<U, R>
where
U: Any,
R: Any,
{
sender: mpsc::SyncSender<WlxFrame>,
receiver: mpsc::Receiver<WlxFrame>,
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
}
pub struct WlrDmabufCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
output_id: u32,
wl: Option<Box<WlxClient>>,
handle: Option<JoinHandle<Box<WlxClient>>>,
data: Option<CaptureData<U, R>>,
fds: VecDeque<RawFd>,
}
impl<U, R> WlrDmabufCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
pub fn new(wl: WlxClient, output_id: u32) -> Self {
Self {
output_id,
wl: Some(Box::new(wl)),
handle: None,
data: None,
fds: VecDeque::new(),
}
}
}
impl<U, R> WlxCapture<U, R> for WlrDmabufCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
fn init(
&mut self,
_: &[DrmFormat],
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
) {
debug_assert!(self.wl.is_some());
let (sender, receiver) = std::sync::mpsc::sync_channel::<WlxFrame>(2);
self.data = Some(CaptureData {
sender,
receiver,
user_data,
receive_callback,
});
}
fn is_ready(&self) -> bool {
self.data.is_some()
}
fn supports_dmbuf(&self) -> bool {
true
}
fn receive(&mut self) -> Option<R> {
if let Some(data) = self.data.as_ref() {
if let Some(WlxFrame::Dmabuf(last)) = data.receiver.try_iter().last() {
// this is the only protocol that requires us to manually close the FD
while self.fds.len() > 6 * last.num_planes {
// safe unwrap
let _ = unsafe { OwnedFd::from_raw_fd(self.fds.pop_back().unwrap()) };
}
for p in 0..last.num_planes {
if let Some(fd) = last.planes[p].fd {
self.fds.push_front(fd);
}
}
return (data.receive_callback)(&data.user_data, WlxFrame::Dmabuf(last));
}
}
None
}
fn pause(&mut self) {}
fn resume(&mut self) {
self.receive(); // clear old frames
}
fn request_new_frame(&mut self) {
if let Some(handle) = self.handle.take() {
if handle.is_finished() {
self.wl = Some(handle.join().unwrap()); // safe to unwrap because we checked is_finished
} else {
self.handle = Some(handle);
return;
}
}
let Some(wl) = self.wl.take() else {
return;
};
self.handle = Some(std::thread::spawn({
let sender = self
.data
.as_ref()
.expect("must call init once before request_new_frame")
.sender
.clone();
let output_id = self.output_id;
move || request_dmabuf_frame(wl, output_id, sender)
}));
}
}
/// Request a new DMA-Buf frame using the wlr-export-dmabuf protocol.
fn request_dmabuf_frame(
client: Box<WlxClient>,
output_id: u32,
sender: mpsc::SyncSender<WlxFrame>,
) -> Box<WlxClient> {
let Some(dmabuf_manager) = client.maybe_wlr_dmabuf_mgr.as_ref() else {
return client;
};
let Some(output) = client.outputs.get(output_id) else {
return client;
};
let transform = wl_transform_to_frame_transform(output.transform);
let (tx, rx) = mpsc::sync_channel::<zwlr_export_dmabuf_frame_v1::Event>(16);
let name = output.name.clone();
let _ = dmabuf_manager.capture_output(1, &output.wl_output, &client.queue_handle, tx.clone());
let mut client = client;
client.dispatch();
let mut frame = None;
rx.try_iter().for_each(|event| match event {
zwlr_export_dmabuf_frame_v1::Event::Frame {
width,
height,
format,
mod_high,
mod_low,
num_objects,
..
} => {
let mut new_frame = DmabufFrame::default();
new_frame.format.width = width;
new_frame.format.height = height;
new_frame.format.fourcc.value = format;
new_frame.format.set_mod(mod_high, mod_low);
new_frame.format.transform = transform;
new_frame.num_planes = num_objects as _;
frame = Some(new_frame);
}
zwlr_export_dmabuf_frame_v1::Event::Object {
index,
fd,
offset,
stride,
..
} => {
let Some(ref mut frame) = frame else {
return;
};
frame.planes[index as usize] = FramePlane {
fd: Some(fd.into_raw_fd()),
offset,
stride: stride as _,
};
}
zwlr_export_dmabuf_frame_v1::Event::Ready { .. } => {
let Some(frame) = frame.take() else {
return;
};
debug!("DMA-Buf frame captured");
let frame = WlxFrame::Dmabuf(frame);
match sender.try_send(frame) {
Ok(_) => (),
Err(mpsc::TrySendError::Full(_)) => (),
Err(mpsc::TrySendError::Disconnected(_)) => {
log::warn!("{}: disconnected", &name);
}
}
}
zwlr_export_dmabuf_frame_v1::Event::Cancel { .. } => {
warn!("DMA-Buf frame capture cancelled");
}
_ => {}
});
client
}
impl Dispatch<ZwlrExportDmabufFrameV1, mpsc::SyncSender<zwlr_export_dmabuf_frame_v1::Event>>
for WlxClient
{
fn event(
_state: &mut Self,
proxy: &ZwlrExportDmabufFrameV1,
event: <ZwlrExportDmabufFrameV1 as Proxy>::Event,
data: &mpsc::SyncSender<zwlr_export_dmabuf_frame_v1::Event>,
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
match event {
zwlr_export_dmabuf_frame_v1::Event::Ready { .. }
| zwlr_export_dmabuf_frame_v1::Event::Cancel { .. } => {
proxy.destroy();
}
_ => {}
}
let _ = data.send(event).or_else(|err| {
warn!("Failed to send DMA-Buf frame event: {}", err);
Ok::<(), mpsc::SendError<zwlr_export_dmabuf_frame_v1::Event>>(())
});
}
}

383
wlx-capture/src/wlr_screencopy.rs Normal file
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use libc::{O_CREAT, O_RDWR, S_IRUSR, S_IWUSR};
use std::{
any::Any,
ffi::CString,
os::fd::{BorrowedFd, RawFd},
sync::{
atomic::{AtomicUsize, Ordering},
mpsc::{self, SyncSender},
},
thread::JoinHandle,
};
use wayland_client::{
protocol::{wl_buffer::WlBuffer, wl_shm::Format, wl_shm_pool::WlShmPool},
Connection, Dispatch, Proxy, QueueHandle, WEnum,
};
use smithay_client_toolkit::reexports::protocols_wlr::screencopy::v1::client::zwlr_screencopy_frame_v1::{ZwlrScreencopyFrameV1, self};
use crate::{
frame::{
DrmFormat, FourCC, FrameFormat, FramePlane, MemFdFrame, WlxFrame, DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB8888,
},
wayland::{wl_transform_to_frame_transform, WlxClient},
WlxCapture,
};
struct BufData {
wl_buffer: WlBuffer,
wl_pool: WlShmPool,
fd: RawFd,
}
impl Drop for BufData {
fn drop(&mut self) {
self.wl_buffer.destroy();
self.wl_pool.destroy();
unsafe {
libc::close(self.fd);
}
}
}
enum ScreenCopyEvent {
Buffer {
data: BufData,
fourcc: FourCC,
width: u32,
height: u32,
stride: u32,
},
Ready,
Failed,
}
struct CaptureData<U, R>
where
U: Any,
R: Any,
{
sender: mpsc::SyncSender<R>,
receiver: mpsc::Receiver<R>,
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
}
pub struct WlrScreencopyCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
output_id: u32,
wl: Option<Box<WlxClient>>,
handle: Option<JoinHandle<Box<WlxClient>>>,
data: Option<CaptureData<U, R>>,
}
impl<U, R> WlrScreencopyCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
pub fn new(wl: WlxClient, output_id: u32) -> Self {
Self {
output_id,
wl: Some(Box::new(wl)),
handle: None,
data: None,
}
}
}
impl<U, R> WlxCapture<U, R> for WlrScreencopyCapture<U, R>
where
U: Any + Send + Clone,
R: Any + Send,
{
fn init(
&mut self,
_: &[DrmFormat],
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
) {
debug_assert!(self.wl.is_some());
let (sender, receiver) = mpsc::sync_channel(2);
self.data = Some(CaptureData {
sender,
receiver,
user_data,
receive_callback,
});
}
fn is_ready(&self) -> bool {
self.data.is_some()
}
fn supports_dmbuf(&self) -> bool {
false // screencopy v1
}
fn receive(&mut self) -> Option<R> {
if let Some(data) = self.data.as_ref() {
data.receiver.try_iter().last()
} else {
None
}
}
fn pause(&mut self) {}
fn resume(&mut self) {
if self.data.is_none() {
return;
}
self.receive(); // clear old frames
self.request_new_frame();
}
fn request_new_frame(&mut self) {
let mut wait_for_damage = false;
if let Some(handle) = self.handle.take() {
if handle.is_finished() {
wait_for_damage = true;
self.wl = Some(handle.join().unwrap()); // safe to unwrap because we checked is_finished
} else {
self.handle = Some(handle);
return;
}
}
let Some(wl) = self.wl.take() else {
return;
};
let data = self
.data
.as_ref()
.expect("must call init once before request_new_frame");
self.handle = Some(std::thread::spawn({
let sender = data.sender.clone();
let user_data = data.user_data.clone();
let receive_callback = data.receive_callback;
let output_id = self.output_id;
move || {
request_screencopy_frame(
wl,
output_id,
sender,
user_data,
receive_callback,
wait_for_damage,
)
}
}));
}
}
/// Request a new DMA-Buf frame using the wlr-screencopy protocol.
fn request_screencopy_frame<U, R>(
client: Box<WlxClient>,
output_id: u32,
sender: SyncSender<R>,
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
wait_for_damage: bool,
) -> Box<WlxClient>
where
U: Any + Send,
R: Any + Send,
{
let Some(screencopy_manager) = client.maybe_wlr_screencopy_mgr.as_ref() else {
return client;
};
let Some(output) = client.outputs.get(output_id) else {
return client;
};
let transform = wl_transform_to_frame_transform(output.transform);
let (tx, rx) = mpsc::sync_channel::<ScreenCopyEvent>(16);
let proxy =
screencopy_manager.capture_output(1, &output.wl_output, &client.queue_handle, tx.clone());
let name = output.name.clone();
let mut client = client;
client.dispatch();
let mut frame_buffer = None;
'receiver: loop {
for event in rx.try_iter() {
match event {
ScreenCopyEvent::Buffer {
data,
fourcc,
width,
height,
stride,
} => {
let frame = MemFdFrame {
format: FrameFormat {
width,
height,
fourcc,
transform,
..Default::default()
},
plane: FramePlane {
fd: Some(data.fd),
offset: 0,
stride: stride as _,
},
..Default::default()
};
log::trace!("{}: Received screencopy buffer, copying", name.as_ref());
if wait_for_damage {
proxy.copy_with_damage(&data.wl_buffer);
} else {
proxy.copy(&data.wl_buffer);
}
frame_buffer = Some((frame, data));
client.dispatch();
}
ScreenCopyEvent::Ready => {
if let Some((frame, buffer)) = frame_buffer {
if let Some(r) = receive_callback(&user_data, WlxFrame::MemFd(frame)) {
let _ = sender.send(r);
log::trace!("{}: Frame ready", name.as_ref());
}
drop(buffer);
}
break 'receiver;
}
ScreenCopyEvent::Failed => {
log::trace!("{}: Frame failed", name.as_ref());
break 'receiver;
}
};
}
}
client
}
static FD_COUNTER: AtomicUsize = AtomicUsize::new(0);
impl Dispatch<ZwlrScreencopyFrameV1, SyncSender<ScreenCopyEvent>> for WlxClient {
fn event(
state: &mut Self,
proxy: &ZwlrScreencopyFrameV1,
event: <ZwlrScreencopyFrameV1 as Proxy>::Event,
data: &SyncSender<ScreenCopyEvent>,
_conn: &Connection,
qhandle: &QueueHandle<Self>,
) {
match event {
zwlr_screencopy_frame_v1::Event::Failed => {
let _ = data.send(ScreenCopyEvent::Failed);
proxy.destroy();
}
zwlr_screencopy_frame_v1::Event::Buffer {
format,
width,
height,
stride,
} => {
let WEnum::Value(shm_format) = format else {
log::warn!("Unknown screencopy format");
let _ = data.send(ScreenCopyEvent::Failed);
proxy.destroy();
return;
};
let Some(fourcc) = fourcc_from_wlshm(shm_format) else {
log::warn!("Unsupported screencopy format");
let _ = data.send(ScreenCopyEvent::Failed);
proxy.destroy();
return;
};
let fd_num = FD_COUNTER.fetch_add(1, Ordering::Relaxed);
let name = CString::new(format!("wlx-{}", fd_num)).unwrap(); // safe
let size = stride * height;
let fd = unsafe {
let fd = libc::shm_open(name.as_ptr(), O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
libc::shm_unlink(name.as_ptr());
libc::ftruncate(fd, size as _);
fd
};
let borrowed_fd = unsafe { BorrowedFd::borrow_raw(fd) };
let wl_pool = state
.wl_shm
.create_pool(borrowed_fd, size as _, qhandle, ());
let wl_buffer = wl_pool.create_buffer(
0,
width as _,
height as _,
stride as _,
shm_format,
qhandle,
(),
);
let _ = data.send(ScreenCopyEvent::Buffer {
data: BufData {
wl_buffer,
wl_pool,
fd,
},
fourcc,
width,
height,
stride,
});
}
zwlr_screencopy_frame_v1::Event::Ready { .. } => {
let _ = data.send(ScreenCopyEvent::Ready);
proxy.destroy();
}
_ => {}
}
}
}
fn fourcc_from_wlshm(shm_format: Format) -> Option<FourCC> {
match shm_format {
Format::Argb8888 => Some(FourCC::from(DRM_FORMAT_ARGB8888)),
Format::Xrgb8888 => Some(FourCC::from(DRM_FORMAT_XRGB8888)),
Format::Abgr8888 => Some(FourCC::from(DRM_FORMAT_ARGB8888)),
Format::Xbgr8888 => Some(FourCC::from(DRM_FORMAT_XRGB8888)),
_ => None,
}
}
// Plumbing below
impl Dispatch<WlShmPool, ()> for WlxClient {
fn event(
_state: &mut Self,
_proxy: &WlShmPool,
_event: <WlShmPool as Proxy>::Event,
_data: &(),
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
}
}
impl Dispatch<WlBuffer, ()> for WlxClient {
fn event(
_state: &mut Self,
_proxy: &WlBuffer,
_event: <WlBuffer as Proxy>::Event,
_data: &(),
_conn: &Connection,
_qhandle: &QueueHandle<Self>,
) {
}
}

178
wlx-capture/src/xshm.rs Normal file
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use std::{
any::Any,
env,
error::Error,
sync::{
mpsc::{self},
Arc,
},
};
use rxscreen::monitor::Monitor;
use crate::{
frame::{DrmFormat, FrameFormat, MemPtrFrame, MouseMeta, WlxFrame, DRM_FORMAT_XRGB8888},
WlxCapture,
};
pub struct XshmScreen {
pub name: Arc<str>,
pub monitor: Monitor,
}
pub struct XshmCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
pub screen: Arc<XshmScreen>,
sender: Option<mpsc::SyncSender<()>>,
receiver: Option<mpsc::Receiver<R>>,
_dummy: Option<Box<U>>,
}
impl<U, R> XshmCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
pub fn new(screen: Arc<XshmScreen>) -> Self {
Self {
screen,
sender: None,
receiver: None,
_dummy: None,
}
}
}
pub fn xshm_get_monitors() -> Result<Vec<Arc<XshmScreen>>, Box<dyn Error>> {
let display = env::var("DISPLAY").inspect_err(|e| log::info!("DISPLAY: {e:?}"))?;
let Ok(d) = rxscreen::Display::new(display) else {
return Err("X11: Failed to open display".into());
};
Ok(d.monitors()
.into_iter()
.enumerate()
.map(|x| {
Arc::new(XshmScreen {
name: x.1.name().replace("DisplayPort", "DP").into(),
monitor: x.1,
})
})
.collect())
}
impl<U, R> WlxCapture<U, R> for XshmCapture<U, R>
where
U: Any + Send,
R: Any + Send,
{
fn init(
&mut self,
_: &[DrmFormat],
user_data: U,
receive_callback: fn(&U, WlxFrame) -> Option<R>,
) {
let (tx_frame, rx_frame) = std::sync::mpsc::sync_channel(4);
let (tx_cmd, rx_cmd) = std::sync::mpsc::sync_channel(2);
self.sender = Some(tx_cmd);
self.receiver = Some(rx_frame);
std::thread::spawn({
let monitor = self.screen.monitor.clone();
move || {
let display = env::var("DISPLAY").expect("DISPLAY not set");
let Ok(d) = rxscreen::Display::new(display) else {
log::error!("{}: failed to open display", monitor.name());
return;
};
let Ok(shm) = d.shm().monitor(&monitor).build() else {
log::error!("{}: failed to create shm", monitor.name());
return;
};
loop {
match rx_cmd.recv() {
Ok(_) => {
if let Ok(image) = shm.capture() {
let size = unsafe { image.as_bytes().len() };
let memptr_frame = MemPtrFrame {
format: FrameFormat {
width: image.width() as _,
height: image.height() as _,
fourcc: DRM_FORMAT_XRGB8888.into(),
..Default::default()
},
ptr: unsafe { image.as_ptr() as _ },
size,
mouse: d.root_mouse_position().and_then(|root_pos| {
monitor.mouse_to_local(root_pos).map(|(x, y)| MouseMeta {
x: (x as f32) / (image.width() as f32),
y: (y as f32) / (image.height() as f32),
})
}),
};
log::trace!("{}: captured frame", &monitor.name());
let frame = WlxFrame::MemPtr(memptr_frame);
if let Some(r) = receive_callback(&user_data, frame) {
match tx_frame.try_send(r) {
Ok(_) => (),
Err(mpsc::TrySendError::Full(_)) => {
log::debug!("{}: channel full", &monitor.name());
}
Err(mpsc::TrySendError::Disconnected(_)) => {
log::warn!(
"{}: capture thread channel closed (send)",
&monitor.name(),
);
break;
}
}
}
} else {
log::debug!("{}: XShmGetImage failed", &monitor.name());
}
}
Err(_) => {
log::warn!("{}: capture thread channel closed (recv)", monitor.name());
break;
}
}
}
log::warn!("{}: capture thread stopped", monitor.name());
}
});
}
fn is_ready(&self) -> bool {
self.receiver.is_some()
}
fn supports_dmbuf(&self) -> bool {
false
}
fn receive(&mut self) -> Option<R> {
if let Some(rx) = self.receiver.as_ref() {
return rx.try_iter().last();
}
None
}
fn pause(&mut self) {}
fn resume(&mut self) {
if let Some(rx) = self.receiver.as_ref() {
log::debug!(
"{}: dropped {} old frames before resuming",
&self.screen.name,
rx.try_iter().count()
);
}
self.request_new_frame();
}
fn request_new_frame(&mut self) {
if let Some(sender) = &self.sender {
if let Err(e) = sender.send(()) {
log::debug!("Failed to send frame request: {}", e);
}
}
}
}