From 7577cfa0c4ca86ff5c46e427f07b05b3330e46c4 Mon Sep 17 00:00:00 2001
From: Saxon <saxon@ausocean.org>
Date: Fri, 15 Nov 2019 15:41:02 +1030
Subject: [PATCH] codec/mjpeg/jpeg.go: added putMarker function to write JPEG
 marker codes to an io.Writer

---
 codec/mjpeg/jpeg.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/codec/mjpeg/jpeg.go b/codec/mjpeg/jpeg.go
index da878d83..c5c42c06 100644
--- a/codec/mjpeg/jpeg.go
+++ b/codec/mjpeg/jpeg.go
@@ -24,6 +24,8 @@ LICENSE
 
 package mjpeg
 
+import "io"
+
 // JPEG marker codes.
 const (
 	soi  = 0xd8 // Start of image.
@@ -34,3 +36,12 @@ const (
 	app0 = 0xe0 // TODO: find out what this is.
 	sof0 = 0xc0 // Baseline
 )
+
+// putMarker writes an JPEG marker with code to w.
+func putMarker(w io.Writer, code byte) error {
+	_, err := w.Write([]byte{0xff, code})
+	if err != nil {
+		return err
+	}
+	return nil
+}