Enables a REST API for the Blackmagic ATEM switchers.

Also provides a SignalR (WebSockets) endpoint for ATEM events - if another ATEM Switcher Control Panel is connected, you'll see the inputs change through messages within the WebSocket connection.

Limitations: currently only allows selecting the PGM source.

1. You'll need to install version 7.5.2 of the Blackmagic Switchers application, found here: https://www.blackmagicdesign.com/support/family/atem-live-production-switchers
2. Install dotnet v6.0
3. Compile & run with dotnet run
4. The default url is https://localhost:5001/ if you haven't already, you'll need to install the loclahost security certificate from dotnet.
5. Swagger is the best way to interact with the API and is available at https://localhost:5001/swagger/index.html
6. Call the /api/atem/connect method to connect to your ATEM. If it's connected via USB then leave the address parameter blank, otherwise supply the IP address of the ATEM.
7. A proper user interface is in the works, providing a similar feel and functionality offered by the ATEM Switcher application but that's very much a work in progress.

Swagger is enabled at https://localhost:5001/swagger/index.html allowing a complete catalog of the API's available. GET requests return values, POST requests assert a change (i.e. is an instruction to the ATEM to do something).

POST http://host:port/api/atem/mixeffects Use this to connect to your ATEM. Address property should be blank if you're connected via USB, otherwise use the ATEM's IP address.

GET https://localhost:5001/api/atem/mixeffects/1/GetProgramInput Returns the current PGM input number. If you have more than one M/E bank on your mixer then replace the 1 with the M/E bank number you wish to query.

POST https://localhost:5001/api/atem/mixeffects/1/SetProgramInput/1 Change the PGM output for the specified M/E block to the input number specified by the value after SetProgramInput.

Review the Swagger page for an exhaustive list of the API's available. Please note that some are still work in progress!

• Provide a full and feature-rich API to provide complete access to the ATEM via a REST API.
• Provide a feature-rich web UI experience, with event feedback from the ATEM
• Mimic the Vmix API.