* feat(linux/xdgportal): implement reactive capture with duplicate detection
Replaces polling-based frame capture with event-driven approach using
condition variables for immediate notification when new frames arrive.
Changes:
- on_process: Notify snapshot() via condition variable on new buffer
- fill_img: Extract and pass through PipeWire seq/pts metadata
- snapshot: Block on condition variable with timeout; detect and skip
duplicate frames using seq/pts metadata to avoid redundant processing
- capture: Simplify catch-up logic to maintain timeline consistency
by advancing in delay intervals without resetting origin
This eliminates tight polling loops and reduces unnecessary frame
processing when compositor reuses buffers.
* feat(linux/xdgportal): optimize software path and fix modesetting crashes
This patch addresses a performance bottleneck in the software encoding
path and a race condition during PipeWire stream re-initialization.
1. Performance Optimization (Double-Buffering):
- Implemented a front/back buffer swapping strategy for the software
(MemPtr) path.
- Frame data is copied to a `back_buffer` without holding the
`frame_mutex`, then swapped with the `front_buffer` under a
short-lived lock.
- This prevents memory bandwidth contention and allows the encoder
and PipeWire threads to work in parallel without blocking.
2. Stability Fixes:
- Implemented `frame_mutex` protection across `on_process`, `fill_img`,
and `cleanup_stream` to prevent use-after-free and dangling pointers
during resolution changes.
- Enhanced `fill_img` to safely bail out if the stream is dead or
no new frame is ready.
- Added explicit state resets (`frame_ready = false`, `current_buffer = nullptr`)
to ensure the encoder thread ignores stale data during re-init.
Fixes intermittent segfaults during resolution changes and restores
performance on systems using software encoding.
* feat(linux/xdgportal): support x-nv-video[0].clientRefreshRateX100 for requesting fractional NTSC framerates
* fix(linux/xdgportal): improve dbus & pipewire teardown logic
* Close dbus proxy connection; fixes orphaned XDG notification icons after
mode changes or stream pauses via XDG icon interaction.
* Migrate shared pipewire destructor logic into cleanup_stream() to reduce
duplication.
---------
Co-authored-by: Andy Grundman <andy@hybridized.org>
Introduces backend API endpoints for ViGEmBus status and installation, updates Windows build scripts to handle ViGEmBus versioning and installer download, and integrates ViGEmBus status and installation controls into the web UI. Removes legacy PowerShell scripts for gamepad driver management and related NSIS installer commands.
David Lane