video_compress_kit_platform_interface

The platform interface package for video_compress_kit.

This package defines the abstract VideoCompressKitPlatform class that all platform implementations must implement, plus the shared Dart types used across the entire federated plugin.

For app developers

You should not depend on this package directly. Instead, use the app-facing video_compress_kit package which re-exports all the types you need.

---

Shared Types

Video types

Type	Description
VideoQuality	Preset compression quality with resolution caps and bitrate estimation (veryLow, low, medium, high, veryHigh)
CompressionConfig	Full configuration for a video compression operation
CompressionResult	Result data returned after compression
MediaInfo	Metadata about a video file (width, height, duration, bitrate, etc.)

Image types

Type	Description
ImageFormat	Output image format enum: jpeg, png, webp
ImageCompressionConfig	Configuration for image compression (quality, max dimensions, format, EXIF)
ImageCompressionResult	Result data returned after image compression

Advanced codec types

Type	Description
H264Profile	H.264 encoding profile: baseline, main, high
BitrateMode	Bitrate mode: vbr, cbr, cq (constant quality)
ColorStandard	Color space standard: bt601, bt709

---

Platform Interface Contract

VideoCompressKitPlatform — abstract methods

Method	Signature	Description
compressVideo	Future<CompressionResult> compressVideo(String path, {required String sessionId, CompressionConfig config})	Compress a video with per-session tracking
compressImage	Future<ImageCompressionResult> compressImage(String path, {ImageCompressionConfig config})	Compress an image (JPEG/PNG/WebP)
getMediaInfo	Future<MediaInfo> getMediaInfo(String path)	Retrieve video metadata
getThumbnail	Future<Uint8List?> getThumbnail(String path, {int quality, int position})	Extract a single JPEG frame
cancelCompression	Future<void> cancelCompression({String? sessionId})	Cancel one or all compression sessions
compressionProgress	Stream<Map<String, dynamic>> get compressionProgress	Progress stream with sessionId and progress (0.0–1.0)

Key design decisions

• Per-session model: compressVideo() requires a sessionId string. Progress events include both sessionId and progress in a Map<String, dynamic>, allowing callers to demultiplex progress for concurrent sessions.
• Cancel granularity: cancelCompression(sessionId: 'x') cancels a specific session; cancelCompression() (no argument) cancels all active sessions.
• Image compression: Separate method compressImage() with its own config/result types, keeping video and image APIs cleanly separated.

CompressionConfig fields

Field	Type	Default	Description
quality	VideoQuality	medium	Quality preset
bitrate	int?	null	Override bitrate in bps
width	int?	null	Override output width
height	int?	null	Override output height
frameRate	int?	null	Override frame rate
includeAudio	bool	true	Include audio track
deleteOrigin	bool	false	Delete original file
outputPath	String?	null	Custom output path
h264Profile	H264Profile?	null	H.264 profile (baseline/main/high)
bitrateMode	BitrateMode?	null	Bitrate mode (vbr/cbr/cq)
cqQuality	int?	null	CQ quality value (0–100)
colorStandard	ColorStandard?	null	Color space (bt601/bt709)
faststart	bool	false	Moov atom at front (both platforms — iOS native, Android custom post-processor)

ImageCompressionConfig fields

Field	Type	Default	Description
quality	int	80	Output quality (1–100). Ignored for PNG
maxWidth	int?	null	Max output width (scales proportionally)
maxHeight	int?	null	Max output height (scales proportionally)
format	ImageFormat	jpeg	Output format: jpeg, png, webp
keepExif	bool	false	Preserve EXIF metadata
outputPath	String?	null	Custom output path

---

For plugin implementors

If you are building a platform implementation (e.g. video_compress_kit_web):

1. Add this package as a dependency.
2. Extend MethodChannelVideoCompressKit (or VideoCompressKitPlatform directly if you don't use method channels).
3. Implement all abstract methods listed above.
4. Register your implementation via registerWith() and list it in your pubspec.yaml under flutter.plugin.platforms.

Method channel protocol

The default MethodChannelVideoCompressKit uses:

Channel	Type	Purpose
com.ikolvi.video_compress_kit	MethodChannel	All request/response calls
com.ikolvi.video_compress_kit/progress	EventChannel	Progress stream

Method calls

Method name	Arguments	Returns
compressVideo	{path, sessionId, ...config.toMap()}	Map → CompressionResult
compressImage	{path, ...imageConfig.toMap()}	Map → ImageCompressionResult
getMediaInfo	{path}	Map → MediaInfo
getThumbnail	{path, quality, position}	Uint8List?
cancelCompression	{sessionId?}	void

Event channel format

Progress events are Map<String, dynamic> with:

• sessionId — String identifying the compression session
• progress — double from 0.0 to 1.0

For backward compatibility, bare double values are also accepted and mapped to {'sessionId': 'unknown', 'progress': value}.

See the federated plugin guide for full details.

License

MIT — see LICENSE.