making new file for basic filter

filter/basic.go

@@ -0,0 +1,62 @@
+// +build !circleci
+
+/*
+DESCRIPTION
+  A filter that detects motion and discards frames without motion. The
+  filter uses a Mixture of Gaussians method (MoG) to determine what is
+  background and what is foreground.
+
+AUTHORS
+  Scott Barnard <scott@ausocean.org>
+
+LICENSE
+  mog.go is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
+
+  It is free software: you can redistribute it and/or modify them
+  under the terms of the GNU General Public License as published by the
+  Free Software Foundation, either version 3 of the License, or (at your
+  option) any later version.
+
+  It is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+  for more details.
+
+  You should have received a copy of the GNU General Public License
+  in gpl.txt.  If not, see http://www.gnu.org/licenses.
+*/
+
+package filter
+
+import (
+	"io"
+)
+
+// MOGFilter is a filter that provides basic motion detection. MoG is short for
+// Mixture of Gaussians method.
+type BasicFilter struct {
+	dst io.WriteCloser
+}
+
+// NewMOGFilter returns a pointer to a new MOGFilter struct.
+func NewBasicFilter(dst io.WriteCloser) *BasicFilter {
+	return &BasicFilter{dst}
+}
+
+// Implements io.Closer.
+// Close frees resources used by gocv, because it has to be done manually, due to
+// it using c-go.
+func (m *BasicFilter) Close() error {
+	return nil
+}
+
+// Implements io.Writer.
+// Write applies the motion filter to the video stream. Only frames with motion
+// are written to the destination encoder, frames without are discarded.
+func (m *BasicFilter) Write(f []byte) (int, error) {
+	//decode MJPEG
+
+	//for all frames find difference in this frame from last frames
+
+	return m.dst.Write(f)
+}