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pipewire.rs
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pipewire.rs
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use std::collections::HashMap;
use std::error::Error;
use std::os::unix::io::AsRawFd;
use std::sync::{atomic::AtomicBool, Arc, Mutex};
use std::time::Duration;
use tracing::{debug, trace, warn};
use dbus::{
arg::{OwnedFd, PropMap, RefArg, Variant},
blocking::{Proxy, SyncConnection},
message::{MatchRule, MessageType},
Message,
};
use gstreamer as gst;
use gstreamer::prelude::*;
use gstreamer_app::AppSink;
use hbb_common::config;
use super::capturable::PixelProvider;
use super::capturable::{Capturable, Recorder};
use super::request_portal::OrgFreedesktopPortalRequestResponse;
use super::screencast_portal::OrgFreedesktopPortalScreenCast as screencast_portal;
use super::remote_desktop_portal::OrgFreedesktopPortalRemoteDesktop as remote_desktop_portal;
#[derive(Debug, Clone, Copy)]
struct PwStreamInfo {
path: u64,
source_type: u64,
position: (i32, i32),
size: (usize, usize),
}
#[derive(Debug)]
pub struct DBusError(String);
impl std::fmt::Display for DBusError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let Self(s) = self;
write!(f, "{}", s)
}
}
impl Error for DBusError {}
#[derive(Debug)]
pub struct GStreamerError(String);
impl std::fmt::Display for GStreamerError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let Self(s) = self;
write!(f, "{}", s)
}
}
impl Error for GStreamerError {}
#[derive(Clone)]
pub struct PipeWireCapturable {
// connection needs to be kept alive for recording
dbus_conn: Arc<SyncConnection>,
fd: OwnedFd,
path: u64,
source_type: u64,
pub position: (i32, i32),
pub size: (usize, usize),
}
impl PipeWireCapturable {
fn new(conn: Arc<SyncConnection>, fd: OwnedFd, stream: PwStreamInfo) -> Self {
Self {
dbus_conn: conn,
fd,
path: stream.path,
source_type: stream.source_type,
position: stream.position,
size: stream.size,
}
}
}
impl std::fmt::Debug for PipeWireCapturable {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"PipeWireCapturable {{dbus: {}, fd: {}, path: {}, source_type: {}}}",
self.dbus_conn.unique_name(),
self.fd.as_raw_fd(),
self.path,
self.source_type
)
}
}
impl Capturable for PipeWireCapturable {
fn name(&self) -> String {
let type_str = match self.source_type {
1 => "Desktop",
2 => "Window",
_ => "Unknow",
};
format!("Pipewire {}, path: {}", type_str, self.path)
}
fn geometry_relative(&self) -> Result<(f64, f64, f64, f64), Box<dyn Error>> {
Ok((0.0, 0.0, 1.0, 1.0))
}
fn before_input(&mut self) -> Result<(), Box<dyn Error>> {
Ok(())
}
fn recorder(&self, _capture_cursor: bool) -> Result<Box<dyn Recorder>, Box<dyn Error>> {
Ok(Box::new(PipeWireRecorder::new(self.clone())?))
}
}
pub struct PipeWireRecorder {
buffer: Option<gst::MappedBuffer<gst::buffer::Readable>>,
buffer_cropped: Vec<u8>,
pix_fmt: String,
is_cropped: bool,
pipeline: gst::Pipeline,
appsink: AppSink,
width: usize,
height: usize,
saved_raw_data: Vec<u8>, // for faster compare and copy
}
impl PipeWireRecorder {
pub fn new(capturable: PipeWireCapturable) -> Result<Self, Box<dyn Error>> {
let pipeline = gst::Pipeline::new(None);
let src = gst::ElementFactory::make("pipewiresrc", None)?;
src.set_property("fd", &capturable.fd.as_raw_fd())?;
src.set_property("path", &format!("{}", capturable.path))?;
src.set_property("keepalive_time", &1_000.as_raw_fd())?;
// For some reason pipewire blocks on destruction of AppSink if this is not set to true,
// see: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/982
src.set_property("always-copy", &true)?;
let sink = gst::ElementFactory::make("appsink", None)?;
sink.set_property("drop", &true)?;
sink.set_property("max-buffers", &1u32)?;
pipeline.add_many(&[&src, &sink])?;
src.link(&sink)?;
let appsink = sink
.dynamic_cast::<AppSink>()
.map_err(|_| GStreamerError("Sink element is expected to be an appsink!".into()))?;
let mut caps = gst::Caps::new_empty();
caps.merge_structure(gst::structure::Structure::new(
"video/x-raw",
&[("format", &"BGRx")],
));
caps.merge_structure(gst::structure::Structure::new(
"video/x-raw",
&[("format", &"RGBx")],
));
appsink.set_caps(Some(&caps));
pipeline.set_state(gst::State::Playing)?;
Ok(Self {
pipeline,
appsink,
buffer: None,
pix_fmt: "".into(),
width: 0,
height: 0,
buffer_cropped: vec![],
is_cropped: false,
saved_raw_data: Vec::new(),
})
}
}
impl Recorder for PipeWireRecorder {
fn capture(&mut self, timeout_ms: u64) -> Result<PixelProvider, Box<dyn Error>> {
if let Some(sample) = self
.appsink
.try_pull_sample(gst::ClockTime::from_mseconds(timeout_ms))
{
let cap = sample
.get_caps()
.ok_or("Failed get caps")?
.get_structure(0)
.ok_or("Failed to get structure")?;
let w: i32 = cap.get_value("width")?.get_some()?;
let h: i32 = cap.get_value("height")?.get_some()?;
let w = w as usize;
let h = h as usize;
self.pix_fmt = cap
.get::<&str>("format")?
.ok_or("Failed to get pixel format")?
.to_string();
let buf = sample
.get_buffer_owned()
.ok_or_else(|| GStreamerError("Failed to get owned buffer.".into()))?;
let mut crop = buf
.get_meta::<gstreamer_video::VideoCropMeta>()
.map(|m| m.get_rect());
// only crop if necessary
if Some((0, 0, w as u32, h as u32)) == crop {
crop = None;
}
let buf = buf
.into_mapped_buffer_readable()
.map_err(|_| GStreamerError("Failed to map buffer.".into()))?;
if let Err(..) = crate::would_block_if_equal(&mut self.saved_raw_data, buf.as_slice()) {
return Ok(PixelProvider::NONE);
}
let buf_size = buf.get_size();
// BGRx is 4 bytes per pixel
if buf_size != (w * h * 4) {
// for some reason the width and height of the caps do not guarantee correct buffer
// size, so ignore those buffers, see:
// https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/985
trace!(
"Size of mapped buffer: {} does NOT match size of capturable {}x{}@BGRx, \
dropping it!",
buf_size,
w,
h
);
} else {
// Copy region specified by crop into self.buffer_cropped
// TODO: Figure out if ffmpeg provides a zero copy alternative
if let Some((x_off, y_off, w_crop, h_crop)) = crop {
let x_off = x_off as usize;
let y_off = y_off as usize;
let w_crop = w_crop as usize;
let h_crop = h_crop as usize;
self.buffer_cropped.clear();
let data = buf.as_slice();
// BGRx is 4 bytes per pixel
self.buffer_cropped.reserve(w_crop * h_crop * 4);
for y in y_off..(y_off + h_crop) {
let i = 4 * (w * y + x_off);
self.buffer_cropped.extend(&data[i..i + 4 * w_crop]);
}
self.width = w_crop;
self.height = h_crop;
} else {
self.width = w;
self.height = h;
}
self.is_cropped = crop.is_some();
self.buffer = Some(buf);
}
} else {
return Ok(PixelProvider::NONE);
}
if self.buffer.is_none() {
return Err(Box::new(GStreamerError("No buffer available!".into())));
}
let buf = if self.is_cropped {
self.buffer_cropped.as_slice()
} else {
self.buffer
.as_ref()
.ok_or("Failed to get buffer as ref")?
.as_slice()
};
match self.pix_fmt.as_str() {
"BGRx" => Ok(PixelProvider::BGR0(self.width, self.height, buf)),
"RGBx" => Ok(PixelProvider::RGB0(self.width, self.height, buf)),
_ => Err(Box::new(GStreamerError(format!(
"Unreachable! Unknown pix_fmt, {}",
&self.pix_fmt
)))),
}
}
}
impl Drop for PipeWireRecorder {
fn drop(&mut self) {
if let Err(err) = self.pipeline.set_state(gst::State::Null) {
warn!("Failed to stop GStreamer pipeline: {}.", err);
}
}
}
fn handle_response<F>(
conn: &SyncConnection,
path: dbus::Path<'static>,
mut f: F,
failure_out: Arc<AtomicBool>,
) -> Result<dbus::channel::Token, dbus::Error>
where
F: FnMut(
OrgFreedesktopPortalRequestResponse,
&SyncConnection,
&Message,
) -> Result<(), Box<dyn Error>>
+ Send
+ Sync
+ 'static,
{
let mut m = MatchRule::new();
m.path = Some(path);
m.msg_type = Some(MessageType::Signal);
m.sender = Some("org.freedesktop.portal.Desktop".into());
m.interface = Some("org.freedesktop.portal.Request".into());
conn.add_match(m, move |r: OrgFreedesktopPortalRequestResponse, c, m| {
debug!("Response from DBus: response: {:?}, message: {:?}", r, m);
match r.response {
0 => {}
1 => {
warn!("DBus response: User cancelled interaction.");
failure_out.store(true, std::sync::atomic::Ordering::Relaxed);
return true;
}
c => {
warn!("DBus response: Unknown error, code: {}.", c);
failure_out.store(true, std::sync::atomic::Ordering::Relaxed);
return true;
}
}
if let Err(err) = f(r, c, m) {
warn!("Error requesting screen capture via dbus: {}", err);
failure_out.store(true, std::sync::atomic::Ordering::Relaxed);
}
true
})
}
fn get_portal(conn: &SyncConnection) -> Proxy<&SyncConnection> {
conn.with_proxy(
"org.freedesktop.portal.Desktop",
"/org/freedesktop/portal/desktop",
Duration::from_millis(1000),
)
}
fn streams_from_response(response: OrgFreedesktopPortalRequestResponse) -> Vec<PwStreamInfo> {
(move || {
Some(
response
.results
.get("streams")?
.as_iter()?
.next()?
.as_iter()?
.filter_map(|stream| {
let mut itr = stream.as_iter()?;
let path = itr.next()?.as_u64()?;
let (keys, values): (Vec<(usize, &dyn RefArg)>, Vec<(usize, &dyn RefArg)>) =
itr.next()?
.as_iter()?
.enumerate()
.partition(|(i, _)| i % 2 == 0);
let attributes = keys
.iter()
.filter_map(|(_, key)| Some(key.as_str()?.to_owned()))
.zip(
values
.iter()
.map(|(_, arg)| *arg)
.collect::<Vec<&dyn RefArg>>(),
)
.collect::<HashMap<String, &dyn RefArg>>();
let mut info = PwStreamInfo {
path,
source_type: attributes
.get("source_type")
.map_or(Some(0), |v| v.as_u64())?,
position: (0, 0),
size: (0, 0),
};
let v = attributes
.get("size")?
.as_iter()?
.filter_map(|v| {
Some(
v.as_iter()?
.map(|x| x.as_i64().unwrap_or(0))
.collect::<Vec<i64>>(),
)
})
.next();
if let Some(v) = v {
if v.len() == 2 {
info.size.0 = v[0] as _;
info.size.1 = v[1] as _;
}
}
if let Some(pos) = attributes.get("position") {
let v = pos
.as_iter()?
.filter_map(|v| {
Some(
v.as_iter()?
.map(|x| x.as_i64().unwrap_or(0))
.collect::<Vec<i64>>(),
)
})
.next();
if let Some(v) = v {
if v.len() == 2 {
info.position.0 = v[0] as _;
info.position.1 = v[1] as _;
}
}
}
Some(info)
})
.collect::<Vec<PwStreamInfo>>(),
)
})()
.unwrap_or_default()
}
static mut INIT: bool = false;
const RESTORE_TOKEN: &str = "restore_token";
const RESTORE_TOKEN_CONF_KEY: &str = "wayland-restore-token";
const PORTAL_CURSOR_MODE_HIDDEN: u32 = 1;
#[allow(dead_code)]
const PORTAL_CURSOR_MODE_EMBEDDED: u32 = 2;
#[allow(dead_code)]
const PORTAL_CURSOR_MODE_METADATA: u32 = 4;
pub fn get_available_cursor_modes() -> Result<u32, dbus::Error> {
let conn = SyncConnection::new_session()?;
let portal = get_portal(&conn);
portal.available_cursor_modes()
}
// mostly inspired by https://gitlab.gnome.org/snippets/19
fn request_screen_cast(
capture_cursor: bool,
) -> Result<(SyncConnection, OwnedFd, Vec<PwStreamInfo>), Box<dyn Error>> {
unsafe {
if !INIT {
gstreamer::init()?;
INIT = true;
}
}
let conn = SyncConnection::new_session()?;
let portal = get_portal(&conn);
let mut args: PropMap = HashMap::new();
let fd: Arc<Mutex<Option<OwnedFd>>> = Arc::new(Mutex::new(None));
let fd_res = fd.clone();
let streams: Arc<Mutex<Vec<PwStreamInfo>>> = Arc::new(Mutex::new(Vec::new()));
let streams_res = streams.clone();
let failure = Arc::new(AtomicBool::new(false));
let failure_res = failure.clone();
args.insert(
"session_handle_token".to_string(),
Variant(Box::new("u1".to_string())),
);
args.insert(
"handle_token".to_string(),
Variant(Box::new("u1".to_string())),
);
// The following code may be improved.
// https://flatpak.github.io/xdg-desktop-portal/#:~:text=To%20avoid%20a%20race%20condition
// To avoid a race condition
// between the caller subscribing to the signal after receiving the reply for the method call and the signal getting emitted,
// a convention for Request object paths has been established that allows
// the caller to subscribe to the signal before making the method call.
let path = remote_desktop_portal::create_session(&portal, args)?;
handle_response(
&conn,
path,
move |r: OrgFreedesktopPortalRequestResponse, c, _| {
let portal = get_portal(c);
let mut args: PropMap = HashMap::new();
if let Ok(version) = remote_desktop_portal::version(&portal) {
if version >= 4 {
let restore_token = config::LocalConfig::get_option(RESTORE_TOKEN_CONF_KEY);
if !restore_token.is_empty() {
args.insert(RESTORE_TOKEN.to_string(), Variant(Box::new(restore_token)));
}
// persist_mode may be configured by the user.
args.insert("persist_mode".to_string(), Variant(Box::new(2u32)));
}
}
args.insert(
"handle_token".to_string(),
Variant(Box::new("u2".to_string())),
);
// https://flatpak.github.io/xdg-desktop-portal/portal-docs.html#gdbus-method-org-freedesktop-portal-ScreenCast.SelectSources
args.insert("multiple".into(), Variant(Box::new(true)));
args.insert("types".into(), Variant(Box::new(1u32))); //| 2u32)));
let mut cursor_mode = 0u32;
let mut available_cursor_modes = 0u32;
if let Ok(modes) = portal.available_cursor_modes() {
available_cursor_modes = modes;
}
// if capture_cursor {
// cursor_mode = PORTAL_CURSOR_MODE_METADATA & available_cursor_modes;
// }
if cursor_mode == 0 {
cursor_mode = PORTAL_CURSOR_MODE_HIDDEN & available_cursor_modes;
}
let plasma = std::env::var("DESKTOP_SESSION").map_or(false, |s| s.contains("plasma"));
if plasma && capture_cursor {
// Warn the user if capturing the cursor is tried on kde as this can crash
// kwin_wayland and tear down the plasma desktop, see:
// https://bugs.kde.org/show_bug.cgi?id=435042
warn!("You are attempting to capture the cursor under KDE Plasma, this may crash your \
desktop, see https://bugs.kde.org/show_bug.cgi?id=435042 for details! \
You have been warned.");
}
if cursor_mode > 0 {
args.insert("cursor_mode".into(), Variant(Box::new(cursor_mode)));
}
let session: dbus::Path = r
.results
.get("session_handle")
.ok_or_else(|| {
DBusError(format!(
"Failed to obtain session_handle from response: {:?}",
r
))
})?
.as_str()
.ok_or_else(|| DBusError("Failed to convert session_handle to string.".into()))?
.to_string()
.into();
let path = portal.select_sources(session.clone(), args)?;
let fd = fd.clone();
let streams = streams.clone();
let failure = failure.clone();
let failure_out = failure.clone();
handle_response(
c,
path,
move |_: OrgFreedesktopPortalRequestResponse, c, _| {
let portal = get_portal(c);
let mut args: PropMap = HashMap::new();
args.insert(
"handle_token".to_string(),
Variant(Box::new("u3".to_string())),
);
let path = remote_desktop_portal::start(&portal, session.clone(), "", args)?;
let session = session.clone();
let fd = fd.clone();
let streams = streams.clone();
let failure = failure.clone();
let failure_out = failure.clone();
handle_response(
c,
path,
move |r: OrgFreedesktopPortalRequestResponse, c, _| {
let portal = get_portal(c);
if let Ok(version) = remote_desktop_portal::version(&portal) {
if version >= 4 {
if let Some(restore_token) = r.results.get(RESTORE_TOKEN) {
if let Some(restore_token) = restore_token.as_str() {
config::LocalConfig::set_option(
RESTORE_TOKEN_CONF_KEY.to_owned(),
restore_token.to_owned(),
);
}
}
}
}
streams
.clone()
.lock()
.unwrap()
.append(&mut streams_from_response(r));
fd.clone().lock().unwrap().replace(
portal.open_pipe_wire_remote(session.clone(), HashMap::new())?,
);
Ok(())
},
failure_out,
)?;
Ok(())
},
failure_out,
)?;
Ok(())
},
failure_res.clone(),
)?;
// wait 3 minutes for user interaction
for _ in 0..1800 {
conn.process(Duration::from_millis(100))?;
// Once we got a file descriptor we are done!
if fd_res.lock().unwrap().is_some() {
break;
}
if failure_res.load(std::sync::atomic::Ordering::Relaxed) {
break;
}
}
let fd_res = fd_res.lock().unwrap();
let streams_res = streams_res.lock().unwrap();
if let Some(fd_res) = fd_res.clone() {
if !streams_res.is_empty() {
return Ok((conn, fd_res, streams_res.clone()));
}
}
Err(Box::new(DBusError(
"Failed to obtain screen capture.".into(),
)))
}
pub fn get_capturables(capture_cursor: bool) -> Result<Vec<PipeWireCapturable>, Box<dyn Error>> {
let (conn, fd, streams) = request_screen_cast(capture_cursor)?;
let conn = Arc::new(conn);
Ok(streams
.into_iter()
.map(|s| PipeWireCapturable::new(conn.clone(), fd.clone(), s))
.collect())
}