fix build without pipewire feature

wayvr/src/backend/wayvr/image_importer.rs

@@ -114,6 +114,8 @@ impl ImageImporter {
             num_planes: dmabuf.num_planes(),
             planes: Default::default(),
             mouse: None,
+            acquire_sync: Default::default(),
+            lease: None,
         };
 
         for (i, handle) in dmabuf.handles().enumerate() {
@@ -129,7 +131,7 @@ impl ImageImporter {
             frame.planes[i].stride = stride as _;
         }
 
-        let image = self.gfx.dmabuf_texture(frame)?;
+        let image = self.gfx.dmabuf_texture(&frame)?;
         log::info!("DMA-buf import: creating image view");
         let image_view = self.gfx.create_image_view(image)?;
         log::info!("DMA-buf import: image view created");

wayvr/src/graphics/dmabuf.rs

@@ -4,11 +4,11 @@ use wgui::gfx::{DmabufImportInfo, DmabufPlaneLayout, Format, Image, ImageView, W
 use wlx_capture::{DrmFormat, DrmFourcc, DrmModifier, frame::DmabufFrame};
 
 pub trait WGfxDmabuf {
-    fn dmabuf_texture(&self, frame: DmabufFrame) -> anyhow::Result<Arc<Image>>;
+    fn dmabuf_texture(&self, frame: &DmabufFrame) -> anyhow::Result<Arc<Image>>;
 }
 
 impl WGfxDmabuf for WGfx {
-    fn dmabuf_texture(&self, frame: DmabufFrame) -> anyhow::Result<Arc<Image>> {
+    fn dmabuf_texture(&self, frame: &DmabufFrame) -> anyhow::Result<Arc<Image>> {
         let format = fourcc_to_vk(frame.format.drm_format.code)?;
         let modifier = (!matches!(frame.format.drm_format.modifier, DrmModifier::Invalid))
             .then(|| u64::from(frame.format.drm_format.modifier));

wayvr/src/graphics/mod.rs

@@ -8,6 +8,8 @@ use wgui::gfx::{
     BufferUsage, BuiltCommandBuffer, Format, ShaderModule, Vert2Buf, Vert2Uv, WGfx, WGfxCreateInfo,
 };
 use wlx_capture::DrmFormat;
+#[cfg(feature = "pipewire")]
+use wlx_capture::syncobj::DrmRenderNode;
 
 use crate::shaders::{
     frag_color, frag_grid, frag_screen, frag_simple, frag_sky, frag_srgb, frag_wayland, vert_quad,
@@ -20,6 +22,8 @@ pub struct WGfxExtras {
     pub drm_formats: Arc<[DrmFormat]>,
     pub quad_verts: Vert2Buf,
     pub drm_device: Option<(i64, i64)>,
+    #[cfg(feature = "pipewire")]
+    pub drm_render_node: Option<DrmRenderNode>,
 }
 
 impl WGfxExtras {
@@ -55,19 +59,32 @@ impl WGfxExtras {
         ];
         let quad_verts = gfx.new_buffer(BufferUsage::VERTEX_BUFFER, &vertices)?;
 
+        #[cfg(feature = "pipewire")]
         let drm_device = gfx.device_info().drm_render_node.map(|(major, minor)| {
             log::info!("DRM render device: {major} {minor}");
             (i64::from(major), i64::from(minor))
         });
+        #[cfg(feature = "pipewire")]
         if drm_device.is_none() {
             log::warn!("No DRM device.");
         }
+        #[cfg(feature = "pipewire")]
+        let drm_render_node = drm_device.and_then(|(maj, min)| {
+            use wgui::log::LogErr;
+            use wlx_capture::syncobj::open_render_node;
+
+            open_render_node(maj as u32, min as u32)
+                .log_err("Could not open DRM render node")
+                .ok()
+        });
 
         Ok(Self {
             shaders,
             drm_formats,
             quad_verts,
             drm_device,
+            #[cfg(feature = "pipewire")]
+            drm_render_node,
         })
     }
 }

wayvr/src/overlays/screen/backend.rs

@@ -48,10 +48,12 @@ pub(super) enum CaptureType {
 
 pub struct ScreenBackend {
     name: Arc<str>,
+    // frames mut come before `capture` to maintain drop order
+    cur_frame: Option<WlxCaptureOut>,
+    pending_frame: Option<WlxCaptureOut>,
     capture_type: CaptureType,
     capture: Box<dyn WlxCapture<WlxCaptureIn, WlxCaptureOut>>,
     pipeline: Option<ScreenPipeline>,
-    cur_frame: Option<WlxCaptureOut>,
     meta: Option<FrameMeta>,
     mouse_transform: Affine2,
     interaction_transform: Option<Affine2>,
@@ -77,6 +79,7 @@ impl ScreenBackend {
             capture,
             pipeline: None,
             cur_frame: None,
+            pending_frame: None,
             meta: None,
             mouse_transform: Affine2::ZERO,
             interaction_transform: None,
@@ -204,7 +207,26 @@ impl OverlayBackend for ScreenBackend {
             return Ok(ShouldRender::Unable);
         }
 
-        if let Some(frame) = self.capture.receive() {
+        // don't submit the new image until the producer signaled
+        if let Some(mut frame) = self.capture.receive()
+            && (self.pending_frame.is_none() || matches!(frame.is_ready(), Ok(true)))
+        {
+            self.pending_frame = Some(frame);
+        }
+        let pending_ready = match self.pending_frame.as_mut() {
+            Some(frame) => match frame.is_ready() {
+                Ok(ready) => ready,
+                Err(e) => {
+                    log::warn!("{}: failed to check DMA-buf acquire fence: {e}", self.name);
+                    self.pending_frame = None;
+                    false
+                }
+            },
+            None => false,
+        };
+
+        if pending_ready {
+            let frame = self.pending_frame.take().unwrap();
             let stereo = self.stereo.unwrap_or(StereoMode::None);
             let mut meta = frame.get_frame_meta(&app.session.config, stereo);
 

wayvr/src/overlays/screen/capture.rs

@@ -558,9 +558,15 @@ pub(super) struct WlxCaptureOut {
     pub(super) image: Arc<ImageView>,
     pub(super) format: FrameFormat,
     pub(super) mouse: Option<MouseMeta>,
+    pub(super) acquire_sync: wlx_frame::FrameAcquireSync,
+    pub(super) _lease: Option<wlx_frame::FrameLease>,
 }
 
 impl WlxCaptureOut {
+    pub(super) fn is_ready(&mut self) -> std::io::Result<bool> {
+        self.acquire_sync.check_ready()
+    }
+
     pub(super) fn get_frame_meta(&self, config: &GeneralConfig, stereo: StereoMode) -> FrameMeta {
         FrameMeta {
             clear: WGfxClearMode::DontCare,
@@ -719,18 +725,23 @@ fn upload_image_with_row_length(
 
 pub(super) fn receive_callback(me: &WlxCaptureIn, frame: WlxFrame) -> Option<WlxCaptureOut> {
     match frame {
-        WlxFrame::Dmabuf(frame) => {
+        WlxFrame::Dmabuf(mut frame) => {
             if !frame.is_valid() {
                 log::error!("{}: Invalid frame", me.name);
                 return None;
             }
             log::trace!("{}: New DMA-buf frame", me.name);
             let format = frame.format;
-            match me.gfx.dmabuf_texture(frame) {
+            let lease = frame.lease.clone();
+            let acquire_sync = std::mem::take(&mut frame.acquire_sync);
+
+            match me.gfx.dmabuf_texture(&frame) {
                 Ok(image) => Some(WlxCaptureOut {
                     image: me.gfx.create_image_view(image).ok()?,
                     format,
                     mouse: None,
+                    acquire_sync,
+                    _lease: lease,
                 }),
                 Err(e) => {
                     log::error!("{}: Failed to create DMA-buf vkImage: {}", me.name, e);
@@ -766,6 +777,8 @@ pub(super) fn receive_callback(me: &WlxCaptureIn, frame: WlxFrame) -> Option<Wlx
                 image: me.gfx.create_image_view(image).ok()?,
                 format: frame.format,
                 mouse: None,
+                acquire_sync: wlx_frame::FrameAcquireSync::Ready,
+                _lease: None,
             })
         }
         WlxFrame::MemPtr(frame) => {
@@ -800,6 +813,8 @@ pub(super) fn receive_callback(me: &WlxCaptureIn, frame: WlxFrame) -> Option<Wlx
                 image: me.gfx.create_image_view(image).ok()?,
                 format: frame.format,
                 mouse: frame.mouse,
+                acquire_sync: wlx_frame::FrameAcquireSync::Ready,
+                _lease: None,
             })
         }
         WlxFrame::Implicit(transform) => {
@@ -823,6 +838,8 @@ pub(super) fn receive_callback(me: &WlxCaptureIn, frame: WlxFrame) -> Option<Wlx
                 image,
                 format,
                 mouse: None,
+                acquire_sync: wlx_frame::FrameAcquireSync::Ready,
+                _lease: None,
             })
         }
     }

wayvr/src/overlays/screen/pw.rs

@@ -344,8 +344,14 @@ fn check(mut par: CheckParams, finalize_fn: ScreenCastFinalizeFn) {
                 par.app.tasks.enqueue(TaskType::Overlay(OverlayTask::Modify(
                     OverlaySelector::Name(par.name.clone()),
                     Box::new(move |app, owc| {
-                        let capture =
-                            new_wlx_capture!(app, PipewireCapture::new(par.name.clone(), node_id));
+                        let capture = new_wlx_capture!(
+                            app,
+                            PipewireCapture::new(
+                                par.name.clone(),
+                                node_id,
+                                app.gfx_extras.drm_render_node.clone()
+                            )
+                        );
 
                         owc.backend =
                             finalize_fn(par.name, par.logical_pos, par.logical_size, capture, app);

wlx-capture/Cargo.toml

@@ -16,6 +16,7 @@ idmap = { workspace = true }
 libc.workspace = true
 log = { workspace = true }
 pipewire = { workspace = true, optional = true }
+timeline_syncobj = { git = "https://github.com/Schmarni-Dev/timeline_syncobj", rev = "7f67e49ebf466487cf35138fc108618092acb9e8", optional = true }
 slotmap.workspace = true
 wayland-client = { workspace = true, optional = true }
 wayland-protocols = {
@@ -46,7 +47,7 @@ smithay-client-toolkit = { version = "0.20.0", optional = true }
 [features]
 default = ["pipewire", "wayland"]
 egl = []
-pipewire = ["dep:dbus", "dep:pipewire", "wayland"]
+pipewire = ["dep:dbus", "dep:pipewire", "dep:timeline_syncobj", "wayland"]
 wayland = [
   "dep:smithay-client-toolkit",
   "dep:wayland-client",

wlx-capture/README.md

@@ -30,17 +30,6 @@ let capture = PipewireCapture::new(
 );
 ```
 
-### 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();

wlx-capture/src/frame.rs

@@ -1,4 +1,10 @@
-use std::os::fd::RawFd;
+use std::{
+    os::fd::{AsRawFd, OwnedFd, RawFd},
+    sync::Arc,
+};
+
+#[cfg(feature = "pipewire")]
+use timeline_syncobj::timeline_syncobj::TimelineSyncObj;
 
 use drm_fourcc::{DrmFormat, DrmFourcc, DrmModifier};
 
@@ -69,6 +75,8 @@ pub struct DmabufFrame {
     pub num_planes: usize,
     pub planes: [FramePlane; 4],
     pub mouse: Option<MouseMeta>,
+    pub acquire_sync: FrameAcquireSync,
+    pub lease: Option<FrameLease>,
 }
 
 impl DmabufFrame {
@@ -139,6 +147,107 @@ pub struct MouseMeta {
     pub y: f32,
 }
 
+#[derive(Clone)]
+pub struct FrameLease(Arc<FrameLeaseInner>);
+
+struct FrameLeaseInner(Box<dyn Fn() + Send + Sync>);
+
+impl FrameLease {
+    pub fn new(f: impl Fn() + Send + Sync + 'static) -> Self {
+        Self(Arc::new(FrameLeaseInner(Box::new(f))))
+    }
+}
+
+impl Drop for FrameLeaseInner {
+    fn drop(&mut self) {
+        (self.0)();
+    }
+}
+
+#[derive(Clone, Default)]
+pub enum FrameAcquireSync {
+    #[default]
+    /// Frame is ready, no sync needed
+    Ready,
+    /// Implicit sync using polled FDs
+    Implicit { fds: Arc<[OwnedFd]> },
+    #[cfg(feature = "pipewire")]
+    /// Explicit sync using DRM SyncObj
+    Explicit {
+        timeline: Arc<TimelineSyncObj>,
+        point: u64,
+    },
+}
+
+impl FrameAcquireSync {
+    pub fn check_ready(&mut self) -> std::io::Result<bool> {
+        match self {
+            FrameAcquireSync::Ready => Ok(true),
+            FrameAcquireSync::Implicit { fds } => {
+                if fds.is_empty() {
+                    return Err(std::io::Error::other("implicit DMA-buf without planes"));
+                }
+                for plane_fd in fds.iter() {
+                    let fd = plane_fd.as_raw_fd();
+                    let mut pfd = libc::pollfd {
+                        fd,
+                        events: libc::POLLIN,
+                        revents: 0,
+                    };
+                    let result = unsafe { libc::poll(&mut pfd, 1, 0) };
+                    if result < 0 {
+                        let error = std::io::Error::last_os_error();
+                        if error.kind() == std::io::ErrorKind::Interrupted {
+                            return Ok(false);
+                        }
+                        return Err(error);
+                    }
+                    if result == 0 {
+                        return Ok(false);
+                    }
+                    if pfd.revents & (libc::POLLNVAL | libc::POLLHUP) != 0 {
+                        return Err(std::io::Error::other(format!(
+                            "DMA-buf plane fd {fd} poll returned with {:#x}",
+                            pfd.revents
+                        )));
+                    }
+                    if pfd.revents & libc::POLLERR != 0 {
+                        static WARNED: std::sync::atomic::AtomicBool =
+                            std::sync::atomic::AtomicBool::new(false);
+                        if !WARNED.swap(true, std::sync::atomic::Ordering::Relaxed) {
+                            log::error!(
+                                "Could not poll implicit acquire fence. Falling back to unsynchronized behavior. Visual artifacts may happen."
+                            );
+                        }
+                        continue;
+                    }
+                    if pfd.revents & libc::POLLIN == 0 {
+                        return Ok(false);
+                    }
+                }
+                *self = FrameAcquireSync::Ready;
+                Ok(true)
+            }
+            #[cfg(feature = "pipewire")]
+            FrameAcquireSync::Explicit { timeline, point } => {
+                if *point == 0 {
+                    return Ok(true);
+                }
+                if timeline
+                    .query_signaled_point()
+                    .map(|signaled| signaled >= *point)
+                    .map_err(|e| std::io::Error::from_raw_os_error(e.raw_os_error()))?
+                {
+                    *self = FrameAcquireSync::Ready;
+                    Ok(true)
+                } else {
+                    Ok(false)
+                }
+            }
+        }
+    }
+}
+
 pub trait DmaExporter {
     fn next_frame(
         &mut self,

wlx-capture/src/lib.rs

@@ -6,12 +6,12 @@ use frame::WlxFrame;
 
 pub mod frame;
 
+#[cfg(feature = "pipewire")]
+pub mod syncobj;
+
 #[cfg(feature = "wayland")]
 pub mod wayland;
 
-#[cfg(feature = "wlr")]
-pub mod wlr_dmabuf;
-
 #[cfg(feature = "wlr")]
 pub mod wlr_screencopy;
 

wlx-capture/src/pipewire/capture.rs

@@ -1,5 +1,9 @@
 use std::any::Any;
+use std::cell::RefCell;
 use std::collections::HashMap;
+use std::os::fd::{FromRawFd, OwnedFd, RawFd};
+use std::ptr::NonNull;
+use std::rc::Rc;
 use std::sync::Arc;
 use std::sync::mpsc;
 use std::thread::JoinHandle;
@@ -10,8 +14,9 @@ use drm_fourcc::DrmModifier;
 use pipewire as pw;
 use pipewire::context::ContextRc;
 use pipewire::main_loop::MainLoopRc;
-use pipewire::spa::buffer::meta::MetaVideoTransformValue;
-use pipewire::spa::buffer::meta::{MetaCursor, MetaHeader, MetaHeaderFlags, MetaVideoTransform};
+use pipewire::spa::buffer::meta::{
+    MetaCursor, MetaHeader, MetaHeaderFlags, MetaVideoTransform, MetaVideoTransformValue,
+};
 use pipewire::stream::StreamRc;
 use pw::spa;
 
@@ -21,7 +26,7 @@ use pw::stream::{Stream, StreamFlags};
 use spa::buffer::DataType;
 use spa::param::ParamType;
 use spa::param::video::VideoFormat;
-use spa::param::video::VideoInfoRaw;
+use spa::param::video::{VideoFlags, VideoInfoRaw};
 use spa::pod::ChoiceValue;
 use spa::pod::Pod;
 use spa::pod::serialize::GenError;
@@ -29,13 +34,24 @@ use spa::pod::{Object, Property, PropertyFlags, Value};
 use spa::utils::Choice;
 use spa::utils::ChoiceEnum;
 use spa::utils::ChoiceFlags;
+use timeline_syncobj::render_node::DrmRenderNode;
+use wayland_client::backend::smallvec::SmallVec;
 
+use super::raw_buffer::DequeuedBuffer;
 use crate::WlxCapture;
 use crate::frame::FrameFormat;
 use crate::frame::MouseMeta;
 use crate::frame::Transform;
 use crate::frame::WlxFrame;
-use crate::frame::{DmabufFrame, FramePlane, MemFdFrame, MemPtrFrame};
+use crate::frame::{
+    DmabufFrame, FrameAcquireSync, FrameLease, FramePlane, MemFdFrame, MemPtrFrame,
+};
+use crate::pipewire::raw_buffer::{HeldBuffers, MAX_PW_BUFFERS};
+use crate::syncobj::import_timeline;
+
+const SPA_DATA_SYNCOBJ: u32 = 5;
+const SPA_META_SYNC_TIMELINE: u32 = 9;
+const SPA_PARAM_BUFFERS_META_TYPE: u32 = 7;
 
 #[derive(Default)]
 struct StreamData {
@@ -48,6 +64,7 @@ pub enum PwChangeRequest {
     Pause,
     Resume,
     Stop,
+    ReleaseBuffer(usize),
 }
 
 struct CaptureData<R>
@@ -66,18 +83,20 @@ where
     data: Option<CaptureData<R>>,
     node_id: u32,
     handle: Option<JoinHandle<Result<(), Error>>>,
+    drm_render_node: Option<DrmRenderNode>,
 }
 
 impl<R> PipewireCapture<R>
 where
     R: Any + Send,
 {
-    pub fn new(name: Arc<str>, node_id: u32) -> Self {
+    pub fn new(name: Arc<str>, node_id: u32, drm_render_node: Option<DrmRenderNode>) -> Self {
         PipewireCapture {
             name,
             data: None,
             node_id,
             handle: None,
+            drm_render_node,
         }
     }
 }
@@ -87,7 +106,8 @@ where
     R: Any + Send,
 {
     fn drop(&mut self) {
-        if let Some(data) = &self.data {
+        if let Some(data) = self.data.take() {
+            drop(data.rx_frame);
             let _ = data.tx_ctrl.send(PwChangeRequest::Stop);
         }
         if let Some(handle) = self.handle.take() {
@@ -107,10 +127,15 @@ where
         user_data: U,
         receive_callback: fn(&U, WlxFrame) -> Option<R>,
     ) {
-        let (tx_frame, rx_frame) = mpsc::sync_channel(2);
+        let (tx_frame, rx_frame) = mpsc::sync_channel(4);
         let (tx_ctrl, rx_ctrl) = pw::channel::channel();
 
-        self.data = Some(CaptureData { tx_ctrl, rx_frame });
+        self.data = Some(CaptureData {
+            tx_ctrl: tx_ctrl.clone(),
+            rx_frame,
+        });
+
+        let drm_render_node = self.drm_render_node.clone();
 
         self.handle = Some(std::thread::spawn({
             let name = self.name.clone();
@@ -123,9 +148,11 @@ where
                     node_id,
                     formats,
                     tx_frame,
+                    tx_ctrl,
                     rx_ctrl,
                     user_data,
                     receive_callback,
+                    drm_render_node,
                 )
             }
         }));
@@ -175,10 +202,12 @@ fn main_loop<U, R>(
     name: Arc<str>,
     node_id: u32,
     dmabuf_formats: Vec<DrmFormat>,
-    sender: mpsc::SyncSender<R>,
-    receiver: pw::channel::Receiver<PwChangeRequest>,
+    tx_frame: mpsc::SyncSender<R>,
+    tx_ctrl: pw::channel::Sender<PwChangeRequest>,
+    rx_ctrl: pw::channel::Receiver<PwChangeRequest>,
     user_data: U,
     receive_callback: fn(&U, WlxFrame) -> Option<R>,
+    drm_render_node: Option<DrmRenderNode>,
 ) -> Result<(), Error>
 where
     U: Any,
@@ -189,6 +218,8 @@ where
     let context = ContextRc::new(&main_loop, None)?;
     let core = context.connect_rc(None)?;
 
+    let held_buffers = Rc::new(RefCell::new(HeldBuffers::default()));
+
     let stream = StreamRc::new(
         core,
         &name,
@@ -217,6 +248,7 @@ where
         })
         .param_changed({
             let name = name.clone();
+            let support_explicit_sync = drm_render_node.is_some();
             move |stream, format, id, param| {
                 let Some(param) = param else {
                     return;
@@ -234,186 +266,278 @@ where
                 format.drm_format.code = spa_to_fourcc(info.format());
                 format.drm_format.modifier = DrmModifier::from(info.modifier());
 
-                let kind = if info.modifier() != 0 {
-                    "DMA-buf"
-                } else {
-                    "SHM"
-                };
+                let dmabuf = info.flags().contains(VideoFlags::MODIFIER);
+                let kind = if dmabuf { "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 mut param_bytes = Vec::new();
+                if dmabuf && support_explicit_sync {
+                    param_bytes.push(obj_to_bytes(get_sync_buffer_params()).unwrap());
+                    // order defines preference, we prefer explicit sync
+                    param_bytes.push(
+                        obj_to_bytes(get_meta_object(
+                            SPA_META_SYNC_TIMELINE,
+                            std::mem::size_of::<MetaSyncTimeline>(),
+                        ))
+                        .unwrap(),
+                    );
+                }
+                param_bytes.push(obj_to_bytes(get_buffer_params()).unwrap());
+                param_bytes.push(
+                    obj_to_bytes(get_meta_object(
+                        spa::sys::SPA_META_Header,
+                        std::mem::size_of::<spa::sys::spa_meta_header>(),
+                    ))
+                    .unwrap(),
+                );
+                param_bytes.push(
+                    obj_to_bytes(get_meta_object(
+                        spa::sys::SPA_META_VideoTransform,
+                        std::mem::size_of::<spa::sys::spa_meta_videotransform>(),
+                    ))
+                    .unwrap(),
+                );
 
-                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];
+                let mut pods: Vec<&Pod> = param_bytes
+                    .iter()
+                    .map(|bytes| Pod::from_bytes(bytes).unwrap())
+                    .collect();
                 if let Err(e) = stream.update_params(&mut pods) {
                     log::error!("{}: failed to update params: {}", name, e);
                 }
             }
         })
+        .remove_buffer({
+            let held_buffers = held_buffers.clone();
+            let name = name.clone();
+            move |_, _, ptr| {
+                if let Some(buffer) = NonNull::new(ptr)
+                    && held_buffers.borrow_mut().on_removed(buffer)
+                {
+                    log::warn!("{name}: PipeWire removed a still-leased buffer");
+                }
+            }
+        })
         .process({
             let name = name.clone();
+            let sync_device = drm_render_node.clone();
+            let held_buffers = held_buffers.clone();
+            let tx_ctrl = tx_ctrl.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);
+                let mut new_buffer = None;
+                while let Some(buffer) = DequeuedBuffer::dequeue(stream) {
+                    new_buffer = Some(buffer);
+                }
+                let Some(buffer) = new_buffer else { return };
+
+                if let Some(header) = buffer.find_meta::<MetaHeader>()
+                    && header.flags().contains(MetaHeaderFlags::CORRUPTED)
+                {
+                    log::warn!("{name}: PipeWire buffer is corrupt");
+                    return;
                 }
 
-                if let Some(mut buffer) = maybe_buffer {
-                    if let Some(header) = buffer.find_meta::<MetaHeader>()
-                        && header.flags().contains(MetaHeaderFlags::CORRUPTED)
-                    {
-                        log::warn!("{}: PipeWire buffer is corrupt.", name);
-                        return;
-                    }
+                if let Some(transform) = buffer.find_meta::<MetaVideoTransform>() {
+                    format.transform = match transform.transform() {
+                        MetaVideoTransformValue::NONE => Transform::Normal,
+                        MetaVideoTransformValue::ROTATED90 => Transform::Rotated90,
+                        MetaVideoTransformValue::ROTATED180 => Transform::Rotated180,
+                        MetaVideoTransformValue::ROTATED270 => Transform::Rotated270,
+                        MetaVideoTransformValue::FLIPPED => Transform::Flipped,
+                        MetaVideoTransformValue::FLIPPED90 => Transform::Flipped90,
+                        MetaVideoTransformValue::FLIPPED180 => Transform::Flipped180,
+                        MetaVideoTransformValue::FLIPPED270 => Transform::Flipped270,
+                        _ => Transform::Undefined,
+                    };
+                }
 
-                    if let Some(transform) = buffer.find_meta::<MetaVideoTransform>() {
-                        format.transform = match transform.transform() {
-                            MetaVideoTransformValue::NONE => Transform::Normal,
-                            MetaVideoTransformValue::ROTATED90 => Transform::Rotated90,
-                            MetaVideoTransformValue::ROTATED180 => Transform::Rotated180,
-                            MetaVideoTransformValue::ROTATED270 => Transform::Rotated270,
-                            MetaVideoTransformValue::FLIPPED => Transform::Flipped,
-                            MetaVideoTransformValue::FLIPPED90 => Transform::Flipped90,
-                            MetaVideoTransformValue::FLIPPED180 => Transform::Flipped180,
-                            MetaVideoTransformValue::FLIPPED270 => Transform::Flipped270,
-                            _ => Transform::Undefined,
+                let mouse_meta = buffer
+                    .find_meta::<MetaCursor>()
+                    .filter(|c| c.is_valid())
+                    .map(|c| MouseMeta {
+                        x: c.position().x as f32 / format.width as f32,
+                        y: c.position().y as f32 / format.height as f32,
+                    });
+
+                let acquire_point = buffer
+                    .find_meta::<MetaSyncTimeline>()
+                    .map(|meta| meta.acquire_point);
+
+                let datas = buffer.datas_mut();
+                if datas.is_empty() {
+                    log::debug!("{name}: empty PipeWire frame");
+                    return;
+                }
+                let is_explicit = datas.len() >= 3
+                    && datas[datas.len() - 2].type_().as_raw() == SPA_DATA_SYNCOBJ
+                    && datas[datas.len() - 1].type_().as_raw() == SPA_DATA_SYNCOBJ;
+                if is_explicit != acquire_point.is_some() {
+                    log::warn!("{name}: inconsistent SyncTimeline metadata / SyncObj FD layout");
+                    return;
+                }
+                let acquire_fd = is_explicit.then(|| datas[datas.len() - 2].fd());
+                let datas = if is_explicit {
+                    &datas[..datas.len() - 2]
+                } else {
+                    datas
+                };
+                if datas.is_empty()
+                    || datas.len() > 4
+                    || datas
+                        .iter()
+                        .any(|d| d.type_().as_raw() == SPA_DATA_SYNCOBJ)
+                {
+                    log::warn!("{name}: invalid PipeWire plane layout");
+                    return;
+                }
+                let data_type = datas[0].type_();
+                if datas.iter().any(|d| d.type_() != data_type) {
+                    log::warn!("{name}: mixed PipeWire data types");
+                    return;
+                }
+
+                match datas[0].type_() {
+                    DataType::DmaBuf => {
+                        let mut planes: SmallVec<[FramePlane; 4]> = datas
+                            .iter()
+                            .map(|p| FramePlane {
+                                fd: Some(p.as_raw().fd as _),
+                                offset: p.chunk().offset(),
+                                stride: p.chunk().stride(),
+                            })
+                            .collect();
+
+                        let acquire_sync = if is_explicit {
+                            let Some(device) = sync_device.as_ref() else {
+                                log::error!("{name}: explicit sync without DRM timeline support");
+                                return;
+                            };
+                            let acquire_point = acquire_point.unwrap();
+                            let fd = acquire_fd.unwrap();
+                            let acquire = match import_timeline(device, fd as RawFd) {
+                                Ok(obj) => obj,
+                                Err(e) => {
+                                    log::error!("{name}: acquire SyncObj import failed: {e}");
+                                    return;
+                                }
+                            };
+                            FrameAcquireSync::Explicit {
+                                timeline: acquire,
+                                point: acquire_point,
+                            }
+                        } else {
+                            let mut fds = Vec::with_capacity(planes.len());
+                            for (index, plane) in planes.iter_mut().enumerate() {
+                                let fd = plane.fd.unwrap(); // always Some
+                                // duplicate the fd so that we can poll it for acquire sync
+                                let duplicate = unsafe { libc::fcntl(fd, libc::F_DUPFD_CLOEXEC, 0) };
+                                if duplicate < 0 {
+                                    log::error!(
+                                        "{name}: failed to duplicate DMA-buf plane {index} FD {fd}: {}",
+                                        std::io::Error::last_os_error()
+                                    );
+                                    return;
+                                }
+                                fds.push(unsafe { OwnedFd::from_raw_fd(duplicate) });
+                                plane.fd = Some(duplicate);
+                            }
+                            FrameAcquireSync::Implicit { fds: fds.into() }
                         };
-                        log::debug!("{}: Transform: {:?}", name, format.transform);
-                    }
 
-                    let mouse_meta = buffer
-                        .find_meta::<MetaCursor>()
-                        .filter(|c| c.is_valid())
-                        .map(|c| MouseMeta {
-                            x: c.position().x as f32 / format.width as f32,
-                            y: c.position().y as f32 / format.height as f32,
+                        let lease_id = held_buffers.borrow_mut().insert(buffer);
+                        let tx = tx_ctrl.clone();
+                        let lease = FrameLease::new(move || {
+                            let _ = tx.send(PwChangeRequest::ReleaseBuffer(lease_id));
                         });
 
-                    let datas = buffer.datas_mut();
-                    if datas.is_empty() {
-                        log::debug!("{}: no data", name);
-                        return;
-                    }
+                        let mut dmabuf = DmabufFrame {
+                            format: *format,
+                            num_planes: planes.len(),
+                            planes: Default::default(),
+                            mouse: mouse_meta,
+                            acquire_sync,
+                            lease: Some(lease),
+                        };
 
-                    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();
+                        dmabuf.planes[..planes.len()].copy_from_slice(&planes[..planes.len()]);
 
-                    match datas[0].type_() {
-                        DataType::DmaBuf => {
-                            let mut dmabuf = DmabufFrame {
-                                format: *format,
-                                num_planes: planes.len(),
-                                mouse: mouse_meta,
-                                planes: 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();
-                                    }
+                        if let Some(result) = receive_callback(&u, WlxFrame::Dmabuf(dmabuf)) {
+                            match tx_frame.try_send(result) {
+                                Ok(()) | Err(mpsc::TrySendError::Full(_)) => (),
+                                Err(mpsc::TrySendError::Disconnected(_)) => {
+                                    log::warn!("{name}: frame receiver disconnected");
+                                    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 raw = datas[0].as_raw();
-                            let chunk = datas[0].chunk();
-                            let offset = chunk.offset() as usize;
-                            let chunk_size = chunk.size() as usize;
-                            let Some(size) = offset.checked_add(chunk_size) else {
-                                log::error!("{name}: PipeWire chunk range overflow");
-                                return;
-                            };
-                            if size > raw.maxsize as usize {
-                                log::error!("{name}: PipeWire chunk extends beyond allocation");
-                                return;
-                            }
-                            let memptr = MemPtrFrame {
-                                format: *format,
-                                ptr: raw.data as _,
-                                size,
-                                offset,
-                                stride: chunk.stride() 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_())
-                        }
                     }
+                    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 tx_frame.try_send(r) {
+                                Ok(_) => (),
+                                Err(mpsc::TrySendError::Full(_)) => (),
+                                Err(mpsc::TrySendError::Disconnected(_)) => {
+                                    log::warn!("{}: disconnected, stopping stream", name);
+                                    let _ = stream.disconnect();
+                                }
+                            }
+                        }
+                    }
+                    DataType::MemPtr => {
+                        let raw = datas[0].as_raw();
+                        let chunk = datas[0].chunk();
+                        let offset = chunk.offset() as usize;
+                        let chunk_size = chunk.size() as usize;
+                        let Some(size) = offset.checked_add(chunk_size) else {
+                            log::error!("{name}: PipeWire chunk range overflow");
+                            return;
+                        };
+                        if size > raw.maxsize as usize {
+                            log::error!("{name}: PipeWire chunk extends beyond allocation");
+                            return;
+                        }
+                        let memptr = MemPtrFrame {
+                            format: *format,
+                            ptr: raw.data as _,
+                            size,
+                            offset,
+                            stride: chunk.stride() as _,
+                            mouse: mouse_meta,
+                        };
+
+                        let frame = WlxFrame::MemPtr(memptr);
+                        if let Some(r) = receive_callback(&u, frame) {
+                            match tx_frame.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_()),
                 }
+
+                // DMA-buf frames transfer ownership to held_buffers,
+                // requeued when their lease expires
             }
         })
         .register()?;
@@ -448,9 +572,10 @@ where
         params.as_mut_slice(),
     )?;
 
-    let _receiver = receiver.attach(main_loop.loop_(), {
+    let _receiver = rx_ctrl.attach(main_loop.loop_(), {
         let name = name.clone();
         let main_loop = main_loop.clone();
+        let held_buffers = held_buffers.clone();
 
         move |req| {
             log::debug!("{name}: request pipewire stream to {req:?}");
@@ -465,6 +590,9 @@ where
                         .set_active(true)
                         .inspect_err(|e| log::warn!("Could not {req:?} pipewire stream: {e:?}"));
                 }
+                PwChangeRequest::ReleaseBuffer(id) => {
+                    held_buffers.borrow_mut().requeue(&stream, id);
+                }
                 PwChangeRequest::Stop => {
                     main_loop.quit();
                 }
@@ -491,7 +619,25 @@ fn get_buffer_params() -> Object {
         | (1 << DataType::MemPtr.as_raw())
         | (1 << DataType::DmaBuf.as_raw());
 
-    let property = Property {
+    get_buffer_params_with_data_types(data_types)
+}
+
+fn get_buffer_params_with_data_types(data_types: i32) -> Object {
+    // since we hold onto buffers until rendering is done,
+    // fewer than 4 buffers may produce stalls
+    let buffers = Property {
+        key: spa::sys::SPA_PARAM_BUFFERS_buffers,
+        flags: PropertyFlags::empty(),
+        value: Value::Choice(ChoiceValue::Int(Choice(
+            ChoiceFlags::empty(),
+            ChoiceEnum::Range {
+                default: 6,
+                min: 4,
+                max: MAX_PW_BUFFERS,
+            },
+        ))),
+    };
+    let data_types = Property {
         key: spa::sys::SPA_PARAM_BUFFERS_dataType,
         flags: PropertyFlags::empty(),
         value: Value::Int(data_types),
@@ -500,10 +646,35 @@ fn get_buffer_params() -> Object {
     spa::pod::object!(
         spa::utils::SpaTypes::ObjectParamBuffers,
         spa::param::ParamType::Buffers,
-        property,
+        buffers,
+        data_types,
     )
 }
 
+fn get_sync_buffer_params() -> Object {
+    let mut obj = get_buffer_params_with_data_types(1 << DataType::DmaBuf.as_raw());
+    obj.properties.push(Property {
+        key: spa::sys::SPA_PARAM_BUFFERS_blocks,
+        flags: PropertyFlags::empty(),
+        value: Value::Choice(ChoiceValue::Int(Choice(
+            ChoiceFlags::empty(),
+            ChoiceEnum::Range {
+                default: 3,
+                // when using sync timeline, we want at least 1 image plane + 2 syncobj fds
+                min: 3,
+                // up to 4 image planes
+                max: 6,
+            },
+        ))),
+    });
+    obj.properties.push(Property {
+        key: SPA_PARAM_BUFFERS_META_TYPE,
+        flags: PropertyFlags::MANDATORY,
+        value: Value::Int(1_i32 << SPA_META_SYNC_TIMELINE),
+    });
+    obj
+}
+
 fn get_meta_object(key: u32, size: usize) -> Object {
     let meta_type_property = Property {
         key: spa::sys::SPA_PARAM_META_type,
@@ -641,3 +812,15 @@ fn spa_to_fourcc(spa: VideoFormat) -> DrmFourcc {
         _ => panic!("Unsupported format"),
     }
 }
+
+#[repr(C)]
+struct MetaSyncTimeline {
+    _flags: u32,
+    _padding: u32,
+    acquire_point: u64,
+    _release_point: u64,
+}
+
+impl spa::buffer::meta::Metadata for MetaSyncTimeline {
+    const META_TYPE: u32 = SPA_META_SYNC_TIMELINE;
+}

wlx-capture/src/pipewire/mod.rs

@@ -26,6 +26,7 @@ slotmap::new_key_type! {
 
 pub mod capture;
 mod dbus_screencast;
+mod raw_buffer;
 
 #[derive(Debug, Clone)]
 pub struct PipewireStream {

wlx-capture/src/pipewire/raw_buffer.rs

@@ -0,0 +1,123 @@
+use std::{marker::PhantomData, mem, ptr::NonNull};
+
+use pipewire::{
+    self as pw,
+    spa::{self, buffer::meta::Metadata},
+    stream::Stream,
+};
+
+pub(super) struct DequeuedBuffer<'a> {
+    stream: &'a Stream,
+    ptr: NonNull<pw::sys::pw_buffer>,
+    _not_send: PhantomData<std::rc::Rc<()>>,
+}
+
+impl<'a> DequeuedBuffer<'a> {
+    pub(super) fn dequeue(stream: &'a Stream) -> Option<Self> {
+        let ptr = NonNull::new(unsafe { stream.dequeue_raw_buffer() })?;
+        Some(Self {
+            stream,
+            ptr,
+            _not_send: PhantomData,
+        })
+    }
+
+    fn spa(&self) -> Option<NonNull<spa::sys::spa_buffer>> {
+        NonNull::new(unsafe { self.ptr.read().buffer })
+    }
+
+    pub(super) fn datas_mut(&self) -> &'a mut [pw::spa::buffer::Data] {
+        let Some(buffer) = self.spa() else {
+            return &mut [];
+        };
+        unsafe {
+            let n_datas = buffer.read().n_datas;
+            if n_datas > 0
+                && let Some(datas) = NonNull::new(buffer.read().datas)
+            {
+                let datas = datas.as_ptr() as *mut pw::spa::buffer::Data;
+                std::slice::from_raw_parts_mut(datas, usize::try_from(n_datas).unwrap())
+            } else {
+                &mut []
+            }
+        }
+    }
+
+    pub(super) fn find_meta<T>(&self) -> Option<&'a T>
+    where
+        T: Metadata,
+    {
+        let buffer = self.spa()?;
+        unsafe {
+            if buffer.read().n_metas != 0 {
+                match T::META_TYPE {
+                    pw::spa::sys::SPA_META_VideoDamage => {
+                        let meta_data =
+                            pw::spa::sys::spa_buffer_find_meta(buffer.as_ptr(), T::META_TYPE)
+                                as *const T;
+                        if !meta_data.is_null() {
+                            return Some(&*meta_data);
+                        }
+                    }
+                    _ => {
+                        let meta_data = pw::spa::sys::spa_buffer_find_meta_data(
+                            buffer.as_ptr(),
+                            T::META_TYPE,
+                            std::mem::size_of::<T>(),
+                        ) as *const T;
+                        if !meta_data.is_null() {
+                            return Some(&*meta_data);
+                        }
+                    }
+                }
+            }
+        }
+        None
+    }
+}
+
+pub(super) const MAX_PW_BUFFERS: i32 = 8;
+
+impl Drop for DequeuedBuffer<'_> {
+    fn drop(&mut self) {
+        unsafe { self.stream.queue_raw_buffer(self.ptr.as_ptr()) };
+    }
+}
+
+#[derive(Default)]
+pub(super) struct HeldBuffers {
+    buffers: Vec<NonNull<pw::sys::pw_buffer>>,
+}
+
+impl HeldBuffers {
+    pub(super) fn insert<'a>(&mut self, buffer: DequeuedBuffer<'a>) -> usize {
+        self.buffers.push(buffer.ptr);
+        let ret_val = buffer.ptr.as_ptr() as usize;
+        mem::forget(buffer);
+        ret_val
+    }
+
+    pub(super) fn on_removed(&mut self, buffer: NonNull<pw::sys::pw_buffer>) -> bool {
+        let before_count = self.buffers.len();
+        self.buffers.retain(|ptr| ptr.as_ptr() != buffer.as_ptr());
+        before_count != self.buffers.len()
+    }
+
+    pub(super) fn requeue(&mut self, stream: &pw::stream::Stream, id: usize) {
+        self.buffers.retain(|ptr| {
+            if ptr.as_ptr() as usize == id {
+                unsafe { stream.queue_raw_buffer(ptr.as_ptr()) };
+                false
+            } else {
+                true
+            }
+        });
+    }
+}
+
+impl Drop for HeldBuffers {
+    fn drop(&mut self) {
+        log::warn!("{} checked-out buffers at shutdown", self.buffers.len());
+        self.buffers.clear();
+    }
+}

wlx-capture/src/syncobj.rs

@@ -0,0 +1,88 @@
+use std::{
+    fs, io,
+    os::{
+        fd::{AsFd, AsRawFd, BorrowedFd, RawFd},
+        unix::fs::{FileTypeExt, MetadataExt},
+    },
+    sync::Arc,
+};
+
+pub use timeline_syncobj::render_node::DrmRenderNode;
+use timeline_syncobj::timeline_syncobj::TimelineSyncObj;
+
+const DRM_CAP_SYNCOBJ: u64 = 0x13;
+const DRM_CAP_SYNCOBJ_TIMELINE: u64 = 0x14;
+
+#[repr(C)]
+struct DrmGetCap {
+    capability: u64,
+    value: u64,
+}
+
+const DRM_IOCTL_GET_CAP: libc::c_ulong = ((3_u64 << 30)
+    | ((std::mem::size_of::<DrmGetCap>() as u64) << 16)
+    | ((b'd' as u64) << 8)
+    | 0x0c) as libc::c_ulong;
+
+fn get_cap(node: &DrmRenderNode, capability: u64) -> io::Result<u64> {
+    let mut arg = DrmGetCap {
+        capability,
+        value: 0,
+    };
+    let ret = unsafe { libc::ioctl(node.as_fd().as_raw_fd(), DRM_IOCTL_GET_CAP, &mut arg) };
+    if ret < 0 {
+        Err(io::Error::last_os_error())
+    } else {
+        Ok(arg.value)
+    }
+}
+
+fn supports_timeline(node: &DrmRenderNode) -> bool {
+    [DRM_CAP_SYNCOBJ, DRM_CAP_SYNCOBJ_TIMELINE]
+        .into_iter()
+        .all(|cap| get_cap(node, cap).is_ok_and(|value| value != 0))
+}
+
+pub fn open_render_node(render_major: u32, render_minor: u32) -> io::Result<DrmRenderNode> {
+    if !(128..=255).contains(&render_minor) {
+        return Err(io::Error::new(
+            io::ErrorKind::Unsupported,
+            format!("Unsupported DRM render minor: {render_minor}"),
+        ));
+    }
+
+    let path = format!("/dev/dri/renderD{render_minor}");
+    let metadata = fs::metadata(&path)?;
+
+    // verify that device actually matches the provided minor/major
+    if !metadata.file_type().is_char_device()
+        || metadata.rdev() != libc::makedev(render_major, render_minor)
+    {
+        return Err(io::Error::new(
+            io::ErrorKind::InvalidData,
+            format!("{path} does not match DRM device {render_major}:{render_minor}"),
+        ));
+    }
+
+    let node = DrmRenderNode::new(render_minor.into())
+        .map_err(|e| io::Error::from_raw_os_error(e.raw_os_error()))?;
+
+    if !supports_timeline(&node) {
+        return Err(io::Error::new(
+            io::ErrorKind::Unsupported,
+            format!("{path} does not support DRM syncobj timelines"),
+        ));
+    }
+
+    Ok(node)
+}
+
+pub(crate) fn import_timeline(node: &DrmRenderNode, fd: RawFd) -> io::Result<Arc<TimelineSyncObj>> {
+    if fd < 0 {
+        return Err(io::Error::from_raw_os_error(libc::EBADF));
+    }
+    let fd = unsafe { BorrowedFd::borrow_raw(fd) };
+    TimelineSyncObj::import(node, fd)
+        .map(Arc::new)
+        .map_err(|e| io::Error::from_raw_os_error(e.raw_os_error()))
+}

wlx-capture/src/wayland.rs

@@ -11,10 +11,7 @@ use smithay_client_toolkit::reexports::{
         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,
-    },
+    protocols_wlr::screencopy::v1::client::zwlr_screencopy_manager_v1::ZwlrScreencopyManagerV1,
 };
 
 use wayland_client::{
@@ -61,7 +58,6 @@ pub struct WlxOutput {
 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 maybe_zwp_linux_dmabuf: Option<ZwpLinuxDmabufV1>,
     pub wl_seat: WlSeat,
@@ -93,7 +89,6 @@ impl WlxClient {
                 .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, 3..=3, ()).ok(),
             maybe_zwp_linux_dmabuf: globals.bind(&qh, 4..=4, ()).ok(),
             outputs: IdMap::new(),
@@ -398,18 +393,6 @@ impl Dispatch<ZxdgOutputManagerV1, ()> for WlxClient {
     }
 }
 
-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,

wlx-capture/src/wlr_dmabuf.rs

@@ -1,258 +0,0 @@
-use std::{
-    any::Any,
-    collections::VecDeque,
-    os::fd::{FromRawFd, IntoRawFd, OwnedFd, RawFd},
-    sync::mpsc,
-    thread::JoinHandle,
-};
-
-use drm_fourcc::{DrmFormat, DrmFourcc, DrmModifier};
-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::{
-    WlxCapture,
-    frame::{DmabufFrame, FrameFormat, FramePlane, WlxFrame},
-    wayland::WlxClient,
-};
-
-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()
-            && 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 = 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 {
-                format: FrameFormat {
-                    width,
-                    height,
-                    drm_format: DrmFormat {
-                        code: match DrmFourcc::try_from(format) {
-                            Ok(code) => code,
-                            Err(e) => {
-                                log::error!("Unrecognized fourcc: {e:?}");
-                                return;
-                            }
-                        },
-                        modifier: DrmModifier::Invalid,
-                    },
-                    transform,
-                },
-                mouse: None,
-                num_planes: num_objects as _,
-                planes: Default::default(),
-            };
-            new_frame.format.set_mod(mod_high, mod_low);
-            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>>(())
-        });
-    }
-}