Add Widevine DRM support for web platforms

[Micoder-dev]

Summary

Adds Widevine DRM support for web platforms (WASM/JS) using dash.js for DASH manifest parsing and EME for license acquisition.

Features

• DrmConfiguration data class for DRM settings (type, license URL, headers)
• DrmHelper JavaScript module bridging Kotlin/WASM with browser EME APIs
• dash.js integration for DASH/MPD playback with DRM protection
• DRM controls in sample app with test stream support
• HTTPS dev server config (required for EME)

Supported

• Widevine on Chrome/Firefox/Edge (web)

Coming Soon

• PlayReady, ClearKey
• Android (ExoPlayer DRM), iOS (FairPlay)

Documentation

See WEB_DRM_SUPPORT.md for installation and usage.

Test

1. Run: ./gradlew :sample:composeApp:wasmJsBrowserDevelopmentRun
2. Open https://localhost:8080
3. Enable DRM toggle → Load Test Stream → Open URL

[kdroidFilter]

Thank you very much for your work. At first glance, it looks really good. I haven’t had time to properly review the code yet, but I’ll probably do that this weekend.

That said, I can already say that as long as support is not universal, the DRM configuration should not be exposed in the common code. Also, I haven’t checked the size of the JS libraries being used yet, but I think it would be cleaner to create a dedicated DRM module (like Media3 does), so that apps that don’t need it aren’t unnecessarily bloated. This is even more critical on the web.

[Micoder-dev]

Thank you very much for your work. At first glance, it looks really good. I haven’t had time to properly review the code yet, but I’ll probably do that this weekend.

That said, I can already say that as long as support is not universal, the DRM configuration should not be exposed in the common code. Also, I haven’t checked the size of the JS libraries being used yet, but I think it would be cleaner to create a dedicated DRM module (like Media3 does), so that apps that don’t need it aren’t unnecessarily bloated. This is even more critical on the web.

Thanks — that makes sense. I can refactor the DRM parts into a separate optional module and move the configuration out of commonMain. I’ll work on it when I’m free and push an update once I restructure it.