feat: Add pixelFormat field (#559)

* Add `mediaSubType` field to device formats

* Create FourCharCode `toString` extension

* Move pixelFormat -> `AVCaptureDevice.Format+toDictionary`

* `mediaSubType` -> `pixelFormat` + non-optional

* ts pixelFormat `string` -> specific formats

* Add default pixelFormat value of `420v` on Android

Co-authored-by: tcoldwell72 <31568400+tcoldwell72@users.noreply.github.com>

src/CameraDevice.ts

@@ -1,4 +1,5 @@
 import type { CameraPosition } from './CameraPosition';
+import type { PixelFormat } from './PixelFormat';
 
 /**
  * Indentifiers for a physical camera (one that actually exists on the back/front of the device)
@@ -171,6 +172,10 @@ export interface CameraDeviceFormat {
    * All supported video stabilization modes
    */
   videoStabilizationModes: VideoStabilizationMode[];
+  /**
+   * Specifies the pixel format on iOS. e.g. 420v, 420f
+   */
+  pixelFormat: PixelFormat;
 }
 
 /**

src/PixelFormat.ts

@@ -0,0 +1,7 @@
+/**
+ * Represents the pixel format of a `Frame`.
+ * * `420v`: 420 YpCbCr 8 Bi-Planar Video Range
+ * * `420f`: 420 YpCbCr 8 Bi-Planar Full Range
+ * * `x420`: 420 YpCbCr 10 Bi-Planar Video Range
+ */
+export type PixelFormat = '420f' | '420v' | 'x420';