config cleanup

README.md

@@ -154,23 +154,32 @@ Current native test coverage includes:
   "oscBindAddress": "127.0.0.1",
   "oscPort": 9000,
   "oscSmoothing": 0.18,
-  "inputVideoFormat": "1080p",
-  "inputFrameRate": "59.94",
-  "outputVideoFormat": "1080p",
-  "outputFrameRate": "59.94",
-  "videoInputBackend": "decklink",
-  "videoOutputBackend": "decklink",
+  "input": {
+    "backend": "decklink",
+    "device": "default",
+    "resolution": "1080p",
+    "frameRate": "59.94"
+  },
+  "output": {
+    "backend": "decklink",
+    "device": "default",
+    "resolution": "1080p",
+    "frameRate": "59.94",
+    "keying": {
+      "external": true,
+      "alphaRequired": false
+    }
+  },
   "autoReload": true,
-  "maxTemporalHistoryFrames": 12,
-  "enableExternalKeying": true
+  "maxTemporalHistoryFrames": 12
 }
 ```
 
-`videoInputBackend` and `videoOutputBackend` select the concrete video I/O backend. Today the app supports `decklink` and `none`; future backends such as NDI, Spout, or file playback can be added behind the same factory boundary.
+`input.backend` and `output.backend` select the concrete video I/O backend. Today the app supports `decklink` and `none`; future backends such as NDI, Spout, or file playback can be added behind the same factory boundary. `device` is currently accepted as a backend-neutral selector placeholder; DeckLink still chooses the first compatible device.
 
-`inputVideoFormat`/`inputFrameRate` select the video capture mode. `outputVideoFormat`/`outputFrameRate` select the playout mode through a backend-neutral mode description; the current DeckLink backend maps that mode to a `BMDDisplayMode` at the DeckLink boundary. Supported modes still depend on the installed card and driver. The shader stack runs at input resolution and the final rendered frame is scaled once into the configured output mode. Common examples include `720p`/`50`, `720p`/`59.94`, `1080i`/`50`, `1080i`/`59.94`, `1080p`/`25`, `1080p`/`50`, `1080p`/`59.94`, and `2160p`/`59.94`.
+`input.resolution`/`input.frameRate` select the video capture mode. `output.resolution`/`output.frameRate` select the playout mode through a backend-neutral mode description; the current DeckLink backend maps that mode to a `BMDDisplayMode` at the DeckLink boundary. Supported modes still depend on the installed card and driver. The shader stack runs at input resolution and the final rendered frame is scaled once into the configured output mode. Common examples include `720p`/`50`, `720p`/`59.94`, `1080i`/`50`, `1080i`/`59.94`, `1080p`/`25`, `1080p`/`50`, `1080p`/`59.94`, and `2160p`/`59.94`.
 
-Legacy `videoFormat` and `frameRate` keys are still accepted and apply to both input and output unless the explicit input/output keys are present.
+The checked-in config uses the nested `input` and `output` objects as the supported shape.
 
 The control UI is available at:
 
@@ -290,7 +299,6 @@ If `SLANG_ROOT` or `MSDF_ATLAS_GEN_ROOT` is not set, the workflow falls back to
 - Audio.
 - Genlock.
 - Logs.
-- Add more video I/O backends now that the DeckLink path is isolated under `src/video/decklink/`.
 - Support a separate sound shader `.slang` file in shader packages. (https://www.shadertoy.com/view/XsBXWt)
 - Add WebView2 for an embedded native control surface.
 - More shader-library organisation and filtering as the built-in library grows.