CfftPlan constructor

CfftPlan(int n)

Creates a reusable c2c FFT plan for transform length n.

Throws ArgumentError if n is not positive. Throws StateError if native plan creation fails.

Implementation

factory CfftPlan(int n) {
  if (n <= 0) throw ArgumentError.value(n, 'n', 'must be > 0');

  final plan = yl_fft_plan_c2c_create(n);
  if (plan == ffi.nullptr) {
    throw StateError('yl_fft_plan_c2c_create($n) returned nullptr');
  }

  ffi.Pointer<ffi.Float>? inRealPtr, inImagPtr, outRealPtr, outImagPtr;
  try {
    inRealPtr = calloc<ffi.Float>(n);
    inImagPtr = calloc<ffi.Float>(n);
    outRealPtr = calloc<ffi.Float>(n);
    outImagPtr = calloc<ffi.Float>(n);

    return CfftPlan._(
      n,
      _CfftPlanResource(plan, inRealPtr, inImagPtr, outRealPtr, outImagPtr),
    );
  } catch (_) {
    if (inRealPtr != null) calloc.free(inRealPtr);
    if (inImagPtr != null) calloc.free(inImagPtr);
    if (outRealPtr != null) calloc.free(outRealPtr);
    if (outImagPtr != null) calloc.free(outImagPtr);
    yl_fft_plan_destroy(plan);
    rethrow;
  }
}