yuv420sp2rgb method

Uint8List yuv420sp2rgb({ required Uint8List yuv420sp, required int width, required int height, })

Convert YUV420SP to RGB

yuv420sp is Image data in YUV420SP(NV12) format. width and height specify the width and height of the Image. Returns RGB bytes.

Implementation

Uint8List yuv420sp2rgb({
  required Uint8List yuv420sp,
  required int width,
  required int height,
}) {
  assert(width > 0, 'width is too small');
  assert(height > 0, 'height is too small');
  assert(yuv420sp.isNotEmpty, 'yuv420sp is empty');

  if (width <= 0 || height <= 0 || yuv420sp.isEmpty) {
    return Uint8List(0);
  }

  final pixels = calloc.allocate<Uint8>(yuv420sp.length);
  for (var i = 0; i < yuv420sp.length; i++) {
    pixels[i] = yuv420sp[i];
  }

  final rgb = calloc.allocate<Uint8>(width * height * 3);

  _yuv420sp2rgbFunction(
    pixels,
    width,
    height,
    rgb,
  );

  final results = _copyUint8PointerToUint8List(rgb, width * height * 3);
  calloc
    ..free(pixels)
    ..free(rgb);
  return results;
}