fit-webview-bridge 0.2.2a3

Qt native WebView bridge with PySide6 bindings

FIT WebView Bridge

Description

FIT WebView Bridge is a cross‑platform Qt widget (C++/Objective‑C++) with PySide6 bindings that wraps the OS‑native web engines:

• Windows → Edge WebView2
• macOS → WKWebView
• Linux → WebKitGTK (with GStreamer for codecs)

It exposes a unified Python API for browser control and enables forensic viewing/capture of content, including media requiring proprietary codecs (e.g., H.264/AAC), without custom QtWebEngine builds or codec redistribution burdens (system codecs are used). All controls (UI and app logic) are delegated to the PySide window.

Why this project

QtWebEngine (Chromium) does not enable proprietary codecs by default, and redistributing them requires licensing. Alternatives (building QtWebEngine with codecs or using QtWebView/QML) have portability/control limitations. The chosen path is to leverage native engines, achieving codec compatibility and full control via a Python API.

Repository layout

fit-webview-bridge/
├─ CMakeLists.txt
├─ cmake/                   # Find*.cmake, toolchains, helpers
├─ include/fitwvb/          # Public headers (API)
├─ src/
│  ├─ core/                 # Facade / common interfaces
│  ├─ win/                  # Edge WebView2 backend (C++)
│  ├─ macos/                # WKWebView backend (Obj-C++)
│  └─ linux/                # WebKitGTK backend (C++)
├─ bindings/pyside6/        # Shiboken6: typesystem & config
├─ tests/                   # Unit / integration
└─ examples/                # Minimal PySide6 demo app

Interface (methods/slots + signals)

Methods / slots

• load(url)
• back()
• forward()
• reload()
• stop()
• setHtml(html, baseUrl)
• evalJs(script, callback)

Signals

• urlChanged(QUrl)
• titleChanged(QString)
• loadProgress(int)
• loadFinished(bool)
• consoleMessage(QString)

Note: the API is uniform across OSes; implementations delegate to the native engine.

Prerequisites

Common

• CMake (>= 3.24 recommended)
• Ninja (generator)
• Python 3.9+
• PySide6 and Shiboken6 (for Python bindings)
• Platform build toolchain

Windows

• MSVC (Visual Studio 2022 or Build Tools) and Windows SDK
• Microsoft Edge WebView2 Runtime
• WebView2 SDK (NuGet/vcpkg)

macOS

• Xcode + Command Line Tools
• Objective‑C++ enabled (.mm)
• Frameworks: WebKit, Cocoa

Linux

• GCC/Clang, pkg-config
• WebKitGTK dev packages (e.g., webkit2gtk-4.1 or distro equivalent)
• GStreamer (base + required plugins for codecs)

Build (indicative)

git clone https://github.com/fit-project/fit-webview-bridge.git
cd fit-webview-bridge
cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release -DBUILD_PYSIDE6_BINDINGS=ON
cmake --build build
# (optional) ctest --test-dir build

Examples

PySide6 samples in examples/ demonstrate URL loading, JS injection, and signal handling.

Codec & licensing notes

The project does not redistribute proprietary codecs: it leverages codecs already provided by the OS. End‑user usage must comply with the relevant licenses/formats.

Project status

Initial/alpha (API subject to change).

Fit Web — Project rationale and options for proprietary codecs

Fit Web is the FIT project's scraper module designed to forensically acquire and preserve web content: https://github.com/fit-project/fit-web.

Like the other modules, Fit Web is based on PySide (Qt for Python). It currently uses QtWebEngine, which is a Chromium wrapper.

The problem

By default, Chromium does not enable proprietary audio/video codecs, notably H.264 and AAC.

Options considered

1) Build QtWebEngine with proprietary codecs

Enable the -webengine-proprietary-codecs option.
Documentation: https://doc.qt.io/qt-6/qtwebengine-overview.html

Drawbacks

• Must be done for all supported operating systems.
• The build requires very powerful machines (e.g., difficulties on a MacBook Air M2 with 16 GB RAM).
• Licensing: distributing H.264 and AAC requires a license.

2) Use QtWebView

QtWebView relies on the OS’s native web APIs; for proprietary‑codec content it uses the system’s codecs.
Pros: no custom builds, no direct license handling.
Cons: the UI layer is QML, geared toward lightweight (often mobile) UIs, so it doesn’t provide full browser control compared to QtWebEngine.

Documentation: https://doc.qt.io/qt-6/qtwebview-index.html

3) Implement a native Qt widget (C/C++) per OS

Develop a Qt widget (usable from PySide6) that embeds the system’s web engine:

• Windows → Edge WebView2
• macOS → WKWebView
• Linux → WebKitGTK (with GStreamer for codecs)

Advantages

• No redistribution licensing: leverage the codecs already provided by the OS.
• A common API can be exposed to PySide6.
• More control than QtWebView, without QML’s limitations.

Disadvantages

• Medium‑to‑high complexity to implement.
• Requires C++ and, on macOS, Objective‑C++.
• Requires custom CMake to include libraries and linking.

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