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70 lines
3 KiB
Markdown
70 lines
3 KiB
Markdown
# GTK 4 Sink & Paintable
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GTK 4 provides `gtk::Video` & `gtk::Picture` for rendering media such as videos. As the default `gtk::Video` widget doesn't
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offer the possibility to use a custom `gst::Pipeline`. The plugin provides a `gst_video::VideoSink` along with a `gdk::Paintable` that's capable of rendering the sink's frames.
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The sink can generate GL Textures if the system is capable of it, but it needs
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to be compiled with either `wayland`, `x11glx` or `x11egl` cargo features. On
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Windows and macOS this is enabled by default.
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Additionally, the sink can render DMABufs directly on Linux if GTK 4.14 or
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newer is used. For this the `dmabuf` feature needs to be enabled.
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Depending on the GTK version that is used and should be supported as minimum,
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new features or more efficient processing can be opted in with the `gtk_v4_10`,
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`gtk_v4_12` and `gtk_v4_14` features. The minimum GTK version required by the
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sink is GTK 4.4 on Linux without GL support, and 4.6 on Windows and macOS, and
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on Linux with GL support.
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The sink will provides a simple test window when launched via `gst-launch-1.0`
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or `gst-play-1.0` or if the environment variable `GST_GTK4_WINDOW=1` is set.
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Setting `GST_GTK4_WINDOW_FULLSCREEN=1` will make the window launch in fullscreen
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mode.
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# Flatpak Integration
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To build and include the plugin in a Flatpak manifest, you can add the following snippet to your json manifest:
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```json
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{
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"sdk-extensions": [
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"org.freedesktop.Sdk.Extension.rust-stable"
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],
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"build-options": {
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"append-path": "/usr/lib/sdk/rust-stable/bin",
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},
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"modules": [
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{
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"name": "gst-plugins-rs",
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"buildsystem": "simple",
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"sources": [
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{
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"type": "archive",
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"url": "https://crates.io/api/v1/crates/gst-plugin-gtk4/0.12.5/download",
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"dest-filename": "gst-plugin-gtk4-0.12.5.tar.gz",
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"sha256": "56e483cb1452f056ae94ccd5f63bdec697e04c87b30d89eb30c3f934042e1022"
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},
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"gst-plugin-gtk4-sources.json"
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],
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"build-options": {
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"env": {
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"CARGO_HOME": "$FLATPAK_BUILDER_BUILDDIR/cargo"
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}
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},
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"build-commands": [
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"cargo cinstall --offline --release --features=wayland,x11glx,x11egl,dmabuf --library-type=cdylib --prefix=/app"
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]
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}
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]
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}
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```
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To generate the additional file `gst-plugin-gtk4-sources.json` which will contain links to all the Cargo dependencies for the plugin to avoid making network requests while building, you need to use the `flatpak-cargo-generator` tool from [flatpak-builder-tools](https://github.com/flatpak/flatpak-builder-tools):
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```sh
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wget https://crates.io/api/v1/crates/gst-plugin-gtk4/0.12.5/download
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tar -xf download
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sha256sum download # update the sha256 in the Flatpak manifest
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cd gst-plugin-gtk4-0.12.5/
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/path/to/flatpak-cargo-generator Cargo.lock -o gst-plugin-gtk4-sources.json
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```
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