cmd/revid-cli & stream/mts/meta: added meta.NewWith function that creates a new meta.Data and adds an initial entry. Using meta.NewWith in revid-cli to initialise mts' global meta.Data with some preamble data.

cmd/revid-cli/main.go

@@ -37,6 +37,8 @@ import (
 	"time"
 
 	"bitbucket.org/ausocean/av/revid"
+	"bitbucket.org/ausocean/av/stream/mts"
+	"bitbucket.org/ausocean/av/stream/mts/meta"
 	"bitbucket.org/ausocean/iot/pi/netsender"
 	"bitbucket.org/ausocean/iot/pi/smartlogger"
 	"bitbucket.org/ausocean/utils/logger"
@@ -65,7 +67,16 @@ var canProfile = true
 // The logger that will be used throughout
 var log *logger.Logger
 
+var (
+	metaPreambleKey  = []byte{0x63, 0x6f, 0x70, 0x79, 0x72, 0x69, 0x67, 0x68, 0x74}
+	metaPreambleData = []byte{0x61, 0x75, 0x73, 0x6f, 0x63, 0x65, 0x61, 0x6e, 0x2e,
+		0x6f, 0x72, 0x67, 0x2f, 0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x2f, 0x63,
+		0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x32, 0x30, 0x31, 0x39}
+)
+
 func main() {
+	mts.Meta = meta.NewWith(string(metaPreambleKey), string(metaPreambleData))
+
 	useNetsender := flag.Bool("NetSender", false, "Are we checking vars through netsender?")
 	runDurationPtr := flag.Duration("runDuration", defaultRunDuration, "How long do you want revid to run for?")
 

stream/mts/encoder.go

@@ -88,17 +88,8 @@ const (
 	psiSndCnt = 7
 )
 
-const (
-	copyright = "copyright"
-	license   = "ausocean.org/license/content2019"
-)
-
 // global Meta
-var Meta = meta.New()
+var Meta *meta.Data
-
-func init() {
-	Meta.Add(copyright, license)
-}
 
 var (
 	patTable = standardPat.Bytes()

stream/mts/meta/meta.go

@@ -76,6 +76,20 @@ func New() *Data {
 	}
 }
 
+func NewWith(key, data string) *Data {
+	meta := &Data{
+		data: make(map[string]string),
+		enc: []byte{
+			0x00,                   // Reserved byte
+			(majVer << 4) | minVer, // MS and LS versions
+			0x00,                   // Data len byte1
+			0x00,                   // Data len byte2
+		},
+	}
+	meta.Add(key, data)
+	return meta
+}
+
 // Add adds metadata with key and val.
 func (m *Data) Add(key, val string) {
 	m.mu.Lock()