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Merged
mgerb merged 1 commit into from
Feb 22, 2026
Merged

feat: start capture on app startup #46

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33 changes: 27 additions & 6 deletions src/capture/video/linux/linux_pipewire_dma_capture.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -4,18 +4,20 @@ const vk = @import("vulkan");

const types = @import("../../../types.zig");
const util = @import("../../../util.zig");
const TokenStorage = @import("../../../common/linux/token_storage.zig");
const Vulkan = @import("../../../vulkan/vulkan.zig").Vulkan;
const Pipewire = @import("./pipewire/pipewire.zig").Pipewire;
const Chan = @import("../../../channel.zig").Chan;
const ChanError = @import("../../../channel.zig").ChanError;
const VideoCaptureSourceType = @import("../video_capture.zig").VideoCaptureSourceType;
const VideoCaptureSelection = @import("../video_capture.zig").VideoCaptureSelection;
const VideoCapture = @import("../video_capture.zig").VideoCapture;
const VideoCaptureError = @import("../video_capture.zig").VideoCaptureError;
const VulkanImageBuffer = @import("../../../vulkan/vulkan_image_buffer.zig").VulkanImageBuffer;
const rc = @import("zigrc");

pub const LinuxPipewireDmaCapture = struct {
const Self = @This();
const log = std.log.scoped(.LinuxPipewireDmaCapture);

allocator: std.mem.Allocator,
vulkan: *Vulkan,
Expand All @@ -31,7 +33,7 @@ pub const LinuxPipewireDmaCapture = struct {
return self;
}

pub fn selectSource(context: *anyopaque, source_type: VideoCaptureSourceType) (VideoCaptureError || anyerror)!void {
pub fn selectSource(context: *anyopaque, selection: VideoCaptureSelection) (VideoCaptureError || anyerror)!void {
const self: *Self = @ptrCast(@alignCast(context));
if (self.pipewire) |pipewire| {
// TODO: Probably don't have to destroy all of pipewire
Expand All @@ -45,10 +47,26 @@ pub const LinuxPipewireDmaCapture = struct {
self.vulkan,
);
errdefer {
self.pipewire.?.deinit();
self.pipewire = null;
if (self.pipewire) |pipewire| {
pipewire.deinit();
self.pipewire = null;
}
}
try self.pipewire.?.selectSource(source_type);
try self.pipewire.?.selectSource(selection);
}

pub fn shouldRestoreCaptureSession(context: *anyopaque) !bool {
const self: *Self = @ptrCast(@alignCast(context));
const restore_token = TokenStorage.loadToken(self.allocator, "restore_token") catch |err| {
log.err("failed to load restore token: {}", .{err});
return false;
};
if (restore_token == null) {
return false;
}
defer self.allocator.free(restore_token.?);

return restore_token.?.len > 0;
}

pub fn nextFrame(context: *anyopaque) ChanError!void {
Expand All @@ -72,7 +90,8 @@ pub const LinuxPipewireDmaCapture = struct {

pub fn size(context: *anyopaque) ?types.Size {
const self: *Self = @ptrCast(@alignCast(context));
return if (self.pipewire.?.info) |info|
const pipewire = self.pipewire orelse return null;
return if (pipewire.info) |info|
.{
.width = info.size.width,
.height = info.size.height,
Expand All @@ -95,6 +114,7 @@ pub const LinuxPipewireDmaCapture = struct {
const self: *Self = @ptrCast(@alignCast(context));
if (self.pipewire) |pipewire| {
pipewire.deinit();
self.pipewire = null;
}
self.allocator.destroy(self);
}
Expand All @@ -104,6 +124,7 @@ pub const LinuxPipewireDmaCapture = struct {
.ptr = self,
.vtable = &.{
.selectSource = selectSource,
.shouldRestoreCaptureSession = shouldRestoreCaptureSession,
.nextFrame = nextFrame,
.closeAllChannels = closeAllChannels,
.waitForFrame = waitForFrame,
Expand Down
44 changes: 29 additions & 15 deletions src/capture/video/linux/pipewire/pipewire.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ const ChanError = @import("../../../../channel.zig").ChanError;
const VulkanImageBufferChan = @import("./vulkan_image_buffer_chan.zig").VulkanImageBufferChan;
const Vulkan = @import("../../../../vulkan/vulkan.zig").Vulkan;
const VideoCaptureError = @import("../../video_capture.zig").VideoCaptureError;
const VideoCaptureSourceType = @import("../../video_capture.zig").VideoCaptureSourceType;
const VideoCaptureSelection = @import("../../video_capture.zig").VideoCaptureSelection;
const c = @import("../../../../common/linux/pipewire_include.zig").c;
const c_def = @import("../../../../common/linux/pipewire_include.zig").c_def;
const Portal = @import("./portal.zig").Portal;
Expand Down Expand Up @@ -49,15 +49,25 @@ pub const Pipewire = struct {
vulkan: *Vulkan,
) (VideoCaptureError || anyerror)!*Self {
const self = try allocator.create(Self);
errdefer allocator.destroy(self);
self.* = Self{
.allocator = allocator,
.rx_chan = try .init(allocator),
.tx_chan = try .init(allocator),
.portal = try .init(allocator),
.rx_chan = undefined,
.tx_chan = undefined,
.portal = undefined,
.vulkan = vulkan,
.vulkan_image_buffer_chan = try VulkanImageBufferChan.init(allocator),
.vulkan_image_buffer_chan = undefined,
};

self.rx_chan = try .init(allocator);
errdefer self.rx_chan.deinit();
self.tx_chan = try .init(allocator);
errdefer self.tx_chan.deinit();
self.portal = try .init(allocator);
errdefer self.portal.deinit();
self.vulkan_image_buffer_chan = try .init(allocator);
errdefer self.vulkan_image_buffer_chan.deinit();

return self;
}

Expand Down Expand Up @@ -111,14 +121,14 @@ pub const Pipewire = struct {
self.allocator.destroy(self);
}

pub fn selectSource(
self: *Self,
source_type: VideoCaptureSourceType,
) (VideoCaptureError || anyerror)!void {
const pipewire_node = try self.portal.selectSource(source_type);
pub fn selectSource(self: *Self, selection: VideoCaptureSelection) (VideoCaptureError || anyerror)!void {
const pipewire_node = try self.portal.selectSource(selection);
const pipewire_fd = try self.portal.openPipewireRemote();
errdefer _ = pw.close(pipewire_fd);

self.has_format = false;
self.info = null;

self.thread_loop = pw.pw_thread_loop_new(
"spacecap-pipewire-capture-video",
null,
Expand Down Expand Up @@ -166,19 +176,23 @@ pub const Pipewire = struct {

try self.startStream(pipewire_node);

while (!self.has_format) {
while (!self.hasValidInfo()) {
pw.pw_thread_loop_wait(self.thread_loop);
}

pw.pw_thread_loop_unlock(self.thread_loop);

if (self.info == null or self.info.?.format < 0) {
return error.bad_format;
}

self.worker_thread = try std.Thread.spawn(.{}, workerMain, .{self});
}

fn hasValidInfo(self: *const Self) bool {
const info = self.info orelse return false;
return self.has_format and
info.format >= 0 and
info.size.width > 0 and
info.size.height > 0;
}

fn build_format(self: *const Self, b: ?*pw.spa_pod_builder, format: u32, modifiers: []const u64) ?*pw.spa_pod {
_ = self;
var format_frame = std.mem.zeroes(pw.spa_pod_frame);
Expand Down
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