Windows Capture

Windows Capture is a highly efficient Rust and Python library that enables you to capture the screen using the Graphics Capture API effortlessly. This library allows you to easily capture the screen of your Windows-based computer and use it for various purposes, such as creating instructional videos, taking screenshots, or recording your gameplay. With its intuitive interface and robust functionality, Windows Capture is an excellent choice for anyone looking for a reliable, easy-to-use screen-capturing solution.

Note this README.md is for Rust library Python library can be found here

Recall.ai - API for desktop recording

If you’re looking for a hosted desktop recording API, consider checking out Recall.ai, an API that records Zoom, Google Meet, Microsoft Teams, in-person meetings, and more.

Features

Updates frames only when required
High performance
Easy to use
Uses the latest screen capture API

Installation

Add this dependency to your Cargo.toml:

[dependencies]
windows-capture = "1.6.0-alpha.1"

Or run this command:

cargo add windows-capture

Usage

use std::io::{self, Write};
use std::time::Instant;

use windows_capture::capture::{Context, GraphicsCaptureApiHandler};
use windows_capture::encoder::{
    AudioSettingsBuilder, ContainerSettingsBuilder, VideoEncoder, VideoSettingsBuilder,
};
use windows_capture::frame::Frame;
use windows_capture::graphics_capture_api::InternalCaptureControl;
use windows_capture::graphics_capture_picker::GraphicsCapturePicker;
use windows_capture::settings::{
    ColorFormat, CursorCaptureSettings, DirtyRegionSettings, DrawBorderSettings,
    MinimumUpdateIntervalSettings, SecondaryWindowSettings, Settings,
};

// Handles capture events.
struct Capture {
    // The video encoder that will be used to encode the frames.
    encoder: Option<VideoEncoder>,
    // To measure the time the capture has been running
    start: Instant,
}

impl GraphicsCaptureApiHandler for Capture {
    // The type of flags used to get the values from the settings, here they are the width and height.
    type Flags = (i32, i32);

    // The type of error that can be returned from `CaptureControl` and `start`
    // functions.
    type Error = Box<dyn std::error::Error + Send + Sync>;

    // Function that will be called to create a new instance. The flags can be
    // passed from settings.
    fn new(ctx: Context<Self::Flags>) -> Result<Self, Self::Error> {
        // If we didn't want to get the size from the settings, we could use frame.width() and frame.height()
        // in the on_frame_arrived function, but we would need to create the encoder there.
        let encoder = VideoEncoder::new(
            VideoSettingsBuilder::new(ctx.flags.0 as u32, ctx.flags.1 as u32),
            AudioSettingsBuilder::default().disabled(true),
            ContainerSettingsBuilder::default(),
            "video.mp4",
        )?;

        Ok(Self { encoder: Some(encoder), start: Instant::now() })
    }

    // Called every time a new frame is available.
    fn on_frame_arrived(
        &mut self,
        frame: &mut Frame,
        capture_control: InternalCaptureControl,
    ) -> Result<(), Self::Error> {
        print!("\rRecording for: {} seconds", self.start.elapsed().as_secs());
        io::stdout().flush()?;

        // Send the frame to the video encoder
        self.encoder.as_mut().unwrap().send_frame(frame)?;

        // The frame has other uses too, for example, you can save a single frame
        // to a file, like this: frame.save_as_image("frame.png", ImageFormat::Png)?;
        // Or get the raw data like this so you have full control: let data = frame.buffer()?;

        // Stop the capture after 6 seconds
        if self.start.elapsed().as_secs() >= 6 {
            // Finish the encoder and save the video.
            self.encoder.take().unwrap().finish()?;

            capture_control.stop();

            // Because the previous prints did not include a newline.
            println!();
        }

        Ok(())
    }

    // Optional handler called when the capture item (usually a window) is closed.
    fn on_closed(&mut self) -> Result<(), Self::Error> {
        println!("Capture session ended");

        Ok(())
    }
}

fn main() {
    // Opens a dialog to pick a window or screen to capture; refer to the docs for other capture items.
    let item = GraphicsCapturePicker::pick_item().expect("Failed to pick item");

    // If the user canceled the selection, exit.
    let Some(item) = item else {
        println!("No item selected");
        return;
    };

    // Get the size of the item to pass to the settings.
    let size = item.size().expect("Failed to get item size");

    let settings = Settings::new(
        // Item to capture
        item,
        // Capture cursor settings
        CursorCaptureSettings::Default,
        // Draw border settings
        DrawBorderSettings::Default,
        // Secondary window settings, if you want to include secondary windows in the capture
        SecondaryWindowSettings::Default,
        // Minimum update interval, if you want to change the frame rate limit (default is 60 FPS or 16.67 ms)
        MinimumUpdateIntervalSettings::Default,
        // Dirty region settings
        DirtyRegionSettings::Default,
        // The desired color format for the captured frame.
        ColorFormat::Rgba8,
        // Additional flags for the capture settings that will be passed to the user-defined `new` function.
        size,
    );

    // Starts the capture and takes control of the current thread.
    // The errors from the handler trait will end up here.
    Capture::start(settings).expect("Screen capture failed");
}

Documentation

Detailed documentation for each API and type is available at https://docs.rs/windows-capture.

Contributing

Contributions are welcome! If you find a bug or want to add a feature, please open an issue or submit a pull request.

License

This project is licensed under the MIT License.

NiiightmareXD/windows-capture