Nix configurations for my homelab
Patch xdg-desktop-portal-wlr to fix the stuttering in stream output
author
yemou
date
(Apr 7, 2026, 9:43 PM -0400)
commit
481e7ad0
481e7ad0e4ba1cdb211a1a58cf7860def2166143
parent
61dd96ff
61dd96ff1e904d3fe4bef18520731d77ba88a393
+130
-15
+12
-12
flake.lock
+12
-12
flake.lock
···
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]
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},
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"locked": {
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-
"lastModified": 1775360939,
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-
"narHash": "sha256-XUBlSgUFdvTh6+K5LcI5mJu5F5L8scmJDMRiZM484TM=",
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+
"lastModified": 1775556024,
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+
"narHash": "sha256-j1u/859OVS54rGlsvFqJdwKPEnFYCI+4pyfTiSfv1Xc=",
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"owner": "nix-community",
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"repo": "home-manager",
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-
"rev": "2097a5c82bdc099c6135eae4b111b78124604554",
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"rev": "4bdfeff1d9b7473e6e58f73f5809576e8a69e406",
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"type": "github"
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},
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"original": {
···
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},
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"nixpkgs-unstable": {
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"locked": {
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"lastModified": 1775036866,
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"narHash": "sha256-ZojAnPuCdy657PbTq5V0Y+AHKhZAIwSIT2cb8UgAz/U=",
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"lastModified": 1775423009,
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"narHash": "sha256-vPKLpjhIVWdDrfiUM8atW6YkIggCEKdSAlJPzzhkQlw=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "6201e203d09599479a3b3450ed24fa81537ebc4e",
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"rev": "68d8aa3d661f0e6bd5862291b5bb263b2a6595c9",
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"type": "github"
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},
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"original": {
···
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},
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"nixpkgs_3": {
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"locked": {
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"lastModified": 1775371993,
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"narHash": "sha256-shlcgEOzW6rl7zmZeYBMP9EpF3O/cTL7/HpWlyqearw=",
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"lastModified": 1775545155,
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"narHash": "sha256-hTjWyj6wz9Iw6IjfrP+rZj1V1DjbVRCd1WjcpxH8Fqs=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "ff2af6f7ebc6c123603d5689aeea6461290f46b5",
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"rev": "f97e195236002ce34b91d43ffe68557ac7d007fc",
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"type": "github"
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},
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"original": {
···
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"rust-overlay": "rust-overlay"
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},
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"locked": {
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"lastModified": 1775298296,
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"narHash": "sha256-TiuT6J+Q2wfdNIwvytKF2J02ySiwO+6whpGXCHzPMSo=",
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"lastModified": 1775543919,
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"narHash": "sha256-htsluTXkVCDngTRD0oNIGH8bTf2u0/j3t52Ha2chG1w=",
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"owner": "roc-lang",
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"repo": "roc",
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"rev": "564046bf97229be1dfabc433871bffc5fcb934d7",
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"rev": "aa4e23c44773c16fbfe09aee22df9f84d81e9225",
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"type": "github"
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},
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"original": {
+5
-3
modules/river.nix
+5
-3
modules/river.nix
···
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roc-lang-server = roc-lang.packages.${prev.stdenv.hostPlatform.system}.lang-server;
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xdg-desktop-portal-wlr = prev.xdg-desktop-portal-wlr.overrideAttrs (
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finalAttrs: prevAttrs: {
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version = "0.7.1";
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version = "896cee82a6f14ee996fb870c0fc5e27533e37907";
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src = prev.fetchFromGitHub {
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owner = "emersion";
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repo = "xdg-desktop-portal-wlr";
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rev = "v${finalAttrs.version}";
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sha256 = "sha256-GIIDeZMIGUiZV0IUhcclRVThE5LKaqVc5VwnNT8beNU=";
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rev = "${finalAttrs.version}";
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sha256 = "sha256-uQYXGiMmrMHCygh5IHt90NSZLPbY7uVMyDx8zUTHXaM=";
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};
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+
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patches = (prevAttrs.patches or [ ]) ++ [ ../patches/${prevAttrs.pname}/pw-graph-driver.patch ];
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}
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);
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})
+113
patches/xdg-desktop-portal-wlr/pw-graph-driver.patch
+113
patches/xdg-desktop-portal-wlr/pw-graph-driver.patch
···
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+
From 8142629da7fd5e400fd00658d5ddaa8ea78cba53 Mon Sep 17 00:00:00 2001
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From: CToID <funk443@icloud.com>
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Date: Sun, 5 Apr 2026 23:24:45 +0800
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Subject: [PATCH] screencast: drive the Pipewire graph by ourselves.
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---
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src/screencast/pipewire_screencast.c | 56 +++++++++++++++++-----------
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1 file changed, 35 insertions(+), 21 deletions(-)
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diff --git a/src/screencast/pipewire_screencast.c b/src/screencast/pipewire_screencast.c
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index 102a0f2b..04f3341b 100644
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--- a/src/screencast/pipewire_screencast.c
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+++ b/src/screencast/pipewire_screencast.c
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@@ -16,6 +16,7 @@
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#include "wlr_screencast.h"
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#include "xdpw.h"
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#include "logger.h"
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+#include "timespec_util.h"
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+
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#define DAMAGE_REGION_COUNT 16
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+
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@@ -328,6 +329,31 @@ void xdpw_pwr_enqueue_buffer(struct xdpw_screencast_instance *cast) {
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cast->current_frame.pw_buffer = NULL;
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}
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+
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+static void pwr_capture_one(void *data) {
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+ struct xdpw_screencast_instance *cast = data;
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+
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+ if (!cast->pwr_stream_state) {
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+ logprint(INFO, "pipewire: not streaming");
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+ return;
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+ }
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+
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+ if (cast->current_frame.pw_buffer) {
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+ logprint(DEBUG, "pipewire: buffer already exported");
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+ goto trigger_graph;
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+ }
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+
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+ xdpw_pwr_dequeue_buffer(cast);
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+ if (!cast->current_frame.pw_buffer) {
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+ logprint(WARN, "pipewire: unable to export buffer");
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+ goto trigger_graph;
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+ }
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+
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+ xdpw_wlr_frame_capture(cast);
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+
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+trigger_graph:
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+ pw_stream_trigger_process(cast->stream);
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+}
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+
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void pwr_update_stream_param(struct xdpw_screencast_instance *cast) {
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logprint(TRACE, "pipewire: stream update parameters");
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struct pw_stream *stream = cast->stream;
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@@ -359,6 +385,7 @@ static void pwr_handle_stream_state_changed(void *data,
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switch (state) {
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case PW_STREAM_STATE_STREAMING:
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cast->pwr_stream_state = true;
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+ pwr_capture_one(cast);
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break;
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case PW_STREAM_STATE_PAUSED:
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if (old == PW_STREAM_STATE_STREAMING) {
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@@ -586,27 +613,13 @@ static void pwr_handle_stream_remove_buffer(void *data, struct pw_buffer *buffer
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buffer->user_data = NULL;
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}
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+
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-static void pwr_handle_stream_on_process(void *data) {
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+static void pwr_handle_stream_trigger_done(void *data) {
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struct xdpw_screencast_instance *cast = data;
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-
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- logprint(TRACE, "pipewire: on process event handle");
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-
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- if (!cast->pwr_stream_state) {
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- logprint(INFO, "pipewire: not streaming");
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- return;
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- }
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-
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- if (cast->current_frame.pw_buffer) {
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- logprint(DEBUG, "pipewire: buffer already exported");
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- return;
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+ uint64_t delay_ns = fps_limit_measure_end(&cast->fps_limit, cast->framerate);
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+ if (delay_ns <= 0) {
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+ delay_ns = (1.0 / cast->framerate) * TIMESPEC_NSEC_PER_SEC;
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}
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-
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- xdpw_pwr_dequeue_buffer(cast);
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- if (!cast->current_frame.pw_buffer) {
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- logprint(WARN, "pipewire: unable to export buffer");
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- return;
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- }
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- xdpw_wlr_frame_capture(cast);
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+ xdpw_add_timer(cast->ctx->state, delay_ns, pwr_capture_one, cast);
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}
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+
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static const struct pw_stream_events pwr_stream_events = {
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@@ -615,7 +628,7 @@ static const struct pw_stream_events pwr_stream_events = {
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.param_changed = pwr_handle_stream_param_changed,
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.add_buffer = pwr_handle_stream_add_buffer,
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.remove_buffer = pwr_handle_stream_remove_buffer,
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- .process = pwr_handle_stream_on_process,
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+ .trigger_done = pwr_handle_stream_trigger_done,
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};
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+
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void xdpw_pwr_stream_create(struct xdpw_screencast_instance *cast) {
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@@ -652,7 +665,8 @@ void xdpw_pwr_stream_create(struct xdpw_screencast_instance *cast) {
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pw_stream_connect(cast->stream,
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PW_DIRECTION_OUTPUT,
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PW_ID_ANY,
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- PW_STREAM_FLAG_ALLOC_BUFFERS,
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+ (PW_STREAM_FLAG_ALLOC_BUFFERS |
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+ PW_STREAM_FLAG_DRIVER),
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params.data, params.size / sizeof(struct spa_pod *));
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+
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+
spa_pod_dynamic_builder_clean(&builder);