Bug: GetSourceScreenshot not giving correct MIME type for `imageFormat: jpg`

[cmack]

Operating System Info

Other

Other OS

Guix Linux

OBS Studio Version

Other

OBS Studio Version (Other)

30.1.2

obs-websocket Version

5.4.2 (as reported by API "GetVersion")

OBS Studio Log URL

https://obsproject.com/logs/vsY4qNMNL2cNp8pn

OBS Studio Crash Log URL

No response

Expected Behavior

Whether imageFormat: 'jpg' or imageFormat: 'jpeg' is submitted, the resulting encoded data uri gives the correct 'image/jpeg' MIME type.

If there are other supported image types listed in the "GetVersion" request having MIME types different than simply prepending image/ to it, it would be nice for them to have their correct MIME type, too.

Current Behavior

1. When making a GetSourceScreenshot request with imageFormat: "jpg" the response's imageData field uses the "image/jpg" mimetype, which is incorrect.
2. Making the same request with imageFormat: "jpeg" the response's imageData field has the correct "image/jpeg" mimetype

Steps to Reproduce

I enabled the debug setting in the submitted log file for the request / response payloads to be evident

1. Make a an appropriate "GetSourceScreenshot" request with the imageFormat: "jpg"` key set
2. Witness the response's imageData value beginning with "data:image/jpg;...."
3. Feel the problem when trying to make an SVG element like:

 <image xlink:href="{verbatim-imageData-from-OBS-here}" :x 0 :y 0 :width 300 :height 300></image>

and seeing no resulting rendering from librsvg
4. Try step 1 - 3 again with imageFormat: "jpeg" at 1; see "data:image/jpeg..." at step 2; and a rendered image at step 3.

Anything else we should know?

I wish I could have tested with a more recent OBS but looking at the main branch, it looks like the "image/" prepend logic is still there and would affect the current version, too.