psi: writing new data strcutres to make things neater and more usable

stream/mts/psi/pmt.go

@@ -27,6 +27,18 @@ LICENSE
 
 package psi
 
+// Bitmasks
+const (
+	// bitmasks used for second byte
+	SYNTAX_INDICATOR = 0x80
+	PRIVATE_BIT      = 0x40
+	RESERVED_BITS    = 0x30
+	SECTION_LENGTH_1 = 0x03 // first two bits of the section length
+
+	// bitmasks used for third byte
+	SECTION_LENGTH_2 = 0xff
+)
+
 type PMT struct {
 	PF      byte   // Point field
 	PFB     []byte // pointer filler bytes
@@ -39,9 +51,11 @@ type PMT struct {
 	CNI     bool   // Current/next indicator
 	Section byte   // Section number
 	LSN     byte   // Last section number
-
 }
 
+func ReadPMT(pmtData []byte) (PMT, error) {
+	return PMT{}, nil
+}
 func (p *PMT) ToByteSlice() (output []byte) {
 	return
 }

stream/mts/psi/psi.go

@@ -0,0 +1,36 @@
+package psi
+
+// Program specific information
+type PSI struct {
+	PF      byte   // Point field
+	PFB     []byte // pointer filler bytes
+	TableID byte   // Table ID
+	SSI     bool   // Sectiopn syntax indicator (1 for PAT, PMT, CAT)
+	PB      bool   // Private bit (0 for PAT, PMT, CAT)
+	SL      uint16 // Section length
+	tss     *TSS   // Table syntax section (length defined by SL) if length 0 then nil
+}
+
+// Table syntax section
+type TSS struct {
+	TIE     uint16 // Table ID extension
+	Version byte   // Version number
+	CNI     bool   // Current/next indicator
+	Section byte   // Section number
+	LSN     byte   // Last section number
+	table   SD     // specific data PAT/PMT
+}
+
+// Specific Data, which could be PAT or PMT
+type SD interface {
+	Read(psiData []byte) (PSI, error)
+	ToByte() []byte
+}
+
+func (p *PSI) Read(psiData []byte) (PSI, error) {
+	return PSI{}, nil
+}
+
+func (p *PSI) ToByte() []byte {
+	return nil
+}