fis_lib_vid/lib/processors/base.dart

import 'dart:typed_data';
import 'dart:ui' as ui;

import 'package:flutter/painting.dart';
import 'package:image/image.dart' as img;
import 'package:vid/us/vid_us_image.dart';

abstract class VidFrameProcessor {
  Uint8List process(Uint8List bytes, int position);

  static Future<VidUsImage> processFrame(
    VidUsImage frame,
    List<VidFrameProcessor>? processors,
  ) async {
    if (processors == null || processors.isEmpty) return frame;

    try {
      final start = DateTime.now();
      final bitmap = await decodeImageFromList(frame.imageData);
      final buffer = (await bitmap.toByteData())!.buffer.asUint8List();
      final width = bitmap.width, height = bitmap.height;
      if (processors.length == 1) {
        final processor = processors.first;
        for (int x = 0; x < width; x++) {
          for (int y = 0; y < height; y++) {
            int position = ((y * width) + x) * 4;
            processor.process(buffer, position);
          }
        }
      } else {
        for (final processor in processors) {
          for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
              int position = ((y * width) + x) * 4;
              processor.process(buffer, position);
            }
          }
        }
      }
      final dstImg = img.Image.fromBytes(width, height, buffer);
      final jpgData = img.encodeJpg(dstImg);
      final dstBuffer = Uint8List.fromList(jpgData);

      final end = DateTime.now();
      final snap = end.difference(start).inMilliseconds;
      // print(snap);

      return VidUsImage(frame.index, width, height, dstBuffer);
    } catch (e) {
      // ignore
    }
    return frame;
  }
}