CameraFrame class
A camera frame packaged for off-thread colour conversion and inference.
Produced by prepareCameraFrame; consumed by detector packages'
detectFromCameraFrame(...) methods, which marshal bytes across isolate
boundaries via TransferableTypedData and perform the final cvtColor /
rotate inside their existing detection isolate (off the UI thread).
The bytes buffer is either a tightly-packed YUV420 buffer produced by
packYuv420, or the raw 4-channel plane of a desktop BGRA/RGBA frame.
- width, height: the output pixel dimensions before any rotation. For YUV this matches the luma plane; for BGRA/RGBA this is the logical image size (which may be smaller than the buffer's stride width).
- strideCols: the Mat column count used when reconstructing a 4-channel
Mat from a BGRA/RGBA buffer (
rowStride ~/ 4). For YUV frames this equals width sincepackYuv420produces a tightly-packed buffer. - conversion: which colour conversion to apply.
- rotation: optional post-conversion rotation, or null for none.
Constructors
- CameraFrame({required Uint8List bytes, required int width, required int height, required int strideCols, required CameraFrameConversion conversion, CameraFrameRotation? rotation})
-
const
Properties
- bytes → Uint8List
-
The packed pixel bytes, ready for colour conversion.
final
- conversion → CameraFrameConversion
-
Colour conversion to apply.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- height → int
-
Output height in pixels (pre-rotation).
final
- rotation → CameraFrameRotation?
-
Optional rotation to apply after conversion, or null for none.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- strideCols → int
-
Mat column count when reconstructing a Mat from bytes. For BGRA/RGBA
this is
rowStride ~/ 4and may exceed width (in which case the consumer should crop to width × height). For YUV this equals width.final - width → int
-
Output width in pixels (pre-rotation).
final
Methods
-
decodePlan(
) → CameraFrameDecodePlan - Builds backend-neutral decode instructions for this frame.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited