FakeMediaTransform class final

A MediaTransform that records what it was asked to do and writes small real files, with no platform channel involved.

Slices 3, 4 and 5 of MOB-027 test against this (contract §11). It writes real files rather than returning a File at a made-up path because the picker builds a PickedAsset from the result and reads its length.

Implemented types

Constructors

FakeMediaTransform({Directory? outputDirectory, List<int> fileBytes = const <int>[0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A], List<int>? frameBytes, VideoInfo videoInfo = const VideoInfo(duration: Duration(seconds: 10), codedWidth: 1920, codedHeight: 1080, rotationDegrees: 0, isHdr: false, hasAudio: true)})
Creates a fake.

Properties

exportedVideoInfo ↔ VideoInfo?
What probeVideo returns for a file this fake itself produced.
getter/setter pair
failure ↔ TransformException?
When non-null, every method throws this instead of succeeding.
getter/setter pair
fileBytes → List<int>
The bytes written into every produced file.
final
frameBytes → List<int>?
What extractFrames returns per frame. Null falls back to fileBytes; a filmstrip test that has to decode its frames passes a real image.
final
frameExtractions → List<FakeFrameExtraction>
Every extractFrames call, in full.
final
frameRequests → List<List<Duration>>
Every extractFrames time list, in order.
final
hashCode → int
The hash code for this object.
no setterinherited
imageExports → List<FakeImageExport>
Every exportImage call, in order.
final
latency ↔ Duration
Artificial latency, so a test can observe that exports do not overlap (spec §7.5).
getter/setter pair
onExportVideo ↔ Future<void> Function(void report(double))?
Runs inside exportVideo, before it returns. report forwards straight to the caller's onProgress. A test uses it to stall an export (proving the queue is sequential), to script progress, or to throw.
getter/setter pair
outputDirectory → Directory
Where produced files are written.
final
probedPaths → List<String>
Every probeVideo path, in order.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scriptedProgress ↔ List<double>?
Progress values exportVideo replays, in order, instead of the default 0 then 1.
getter/setter pair
videoExports → List<FakeVideoExport>
Every exportVideo call, in order.
final
videoInfo → VideoInfo
What probeVideo returns.
final

Methods

dispose() → Future<void>
Deletes outputDirectory and everything in it.
exportImage(String srcPath, CropRect crop, ImageEncodeSettings settings) → Future<File>
Decodes srcPath with settings' size cap applied at decode time, crops it to crop, re-encodes it, and returns the written file.
override
exportVideo(String srcPath, CropRect crop, DurationRange trim, VideoEncodeSettings settings, {void onProgress(double progress)?, TransformCancelToken? cancelToken}) → Future<File>
Crops srcPath to crop, clips it to trim, transcodes it per settings, and returns the written file.
override
extractFrames(String srcPath, List<Duration> times, ThumbSize size) → Future<List<Uint8List>>
Extracts one frame per entry in times, each scaled to fit size.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
probeVideo(String srcPath) → Future<VideoInfo>
Reads duration, coded size, rotation, HDR and audio presence from srcPath without decoding it.
override
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited