Env: Add CAM_CAPS variable - way to set custom caps

Signed-off-by: Vasiliy Doylov <nekocwd@mainlining.org>

README.md

@@ -12,6 +12,7 @@ Mostly made for PostmarketOS phones
   - `VIDEO_ENCODE` = `x264enc tune=zerolatency speed-preset=ultrafast bitrate=8192` - String, video encode pipeline
   - `AUDIO_ENABLED` = `true` - Bool, is audio record enabled (`false` to disable)
   - `AUDIO_PROFILE` = `audio/x-ac3` - String - audio encoding
+  - `CAM_CAPS` = auto max caps by default - String
 ## Project TODO:
   - [ ] Fix cam/mode switching? (I can't reproduce errors)
   - [ ] Simplify customization

src/gst.vala

@@ -131,7 +131,10 @@ public class EyeNeko.Gstreamer : Object {
         camerasrc_wrapper.set_property
             ("video-source",
             new Elements.CameraSrc (camera.device.create_element (null),
-                                    get_best_caps (camera.device)));
+                                    Gst.Caps.from_string (
+                                                          Env.get_variable_or ("CAM_CAPS",
+                                                                               get_best_caps (camera.device).to_string ()
+            ))));
         camerabin.set_state (Gst.State.PLAYING);
     }