From 795157577139d0fc37d43ed0eae78bf933a4257b Mon Sep 17 00:00:00 2001
From: saxon <saxon.milton@gmail.com>
Date: Fri, 8 Feb 2019 18:00:23 +1030
Subject: [PATCH] stream/mts: undo changes to encoder.go

stream/rtp/encoder.go: undoing changes
---
 stream/mts/encoder.go | 118 +++++++++---------------------------------
 stream/rtp/encoder.go |   4 +-
 2 files changed, 26 insertions(+), 96 deletions(-)

diff --git a/stream/mts/encoder.go b/stream/mts/encoder.go
index 02761b91..a309eaf9 100644
--- a/stream/mts/encoder.go
+++ b/stream/mts/encoder.go
@@ -30,9 +30,9 @@ package mts
 
 import (
 	"io"
-	"sync"
 	"time"
 
+	"bitbucket.org/ausocean/av/stream/mts/meta"
 	"bitbucket.org/ausocean/av/stream/mts/pes"
 	"bitbucket.org/ausocean/av/stream/mts/psi"
 )
@@ -82,93 +82,21 @@ var (
 			},
 		},
 	}
-
-	// standardPmtTimeLocation is a standard PMT with time and location
-	// descriptors, but time and location fields zeroed out.
-	standardPmtTimeLocation = psi.PSI{
-		Pf:  0x00,
-		Tid: 0x02,
-		Ssi: true,
-		Sl:  0x3e,
-		Tss: &psi.TSS{
-			Tide: 0x01,
-			V:    0,
-			Cni:  true,
-			Sn:   0,
-			Lsn:  0,
-			Sd: &psi.PMT{
-				Pcrpid: 0x0100,
-				Pil:    psi.PmtTimeLocationPil,
-				Pd: []psi.Desc{
-					{
-						Dt: psi.TimeDescTag,
-						Dl: psi.TimeDataSize,
-						Dd: make([]byte, psi.TimeDataSize),
-					},
-					{
-						Dt: psi.LocationDescTag,
-						Dl: psi.LocationDataSize,
-						Dd: make([]byte, psi.LocationDataSize),
-					},
-				},
-				Essd: &psi.ESSD{
-					St:   0x1b,
-					Epid: 0x0100,
-					Esil: 0x00,
-				},
-			},
-		},
-	}
 )
 
 const (
 	psiInterval = 1 * time.Second
 )
 
-// timeLocation holds time and location data
-type timeLocation struct {
-	mu       sync.RWMutex
-	time     uint64
-	location string
-}
-
-// SetTimeStamp sets the time field of a TimeLocation.
-func (tl *timeLocation) SetTimeStamp(t uint64) {
-	tl.mu.Lock()
-	tl.time = t
-	tl.mu.Unlock()
-}
-
-// GetTimeStamp returns the location of a TimeLocation.
-func (tl *timeLocation) TimeStamp() uint64 {
-	tl.mu.RLock()
-	t := tl.time
-	tl.mu.RUnlock()
-	return t
-}
-
-// SetLocation sets the location of a TimeLocation.
-func (tl *timeLocation) SetLocation(l string) {
-	tl.mu.Lock()
-	tl.location = l
-	tl.mu.Unlock()
-}
-
-// GetLocation returns the location of a TimeLocation.
-func (tl *timeLocation) Location() string {
-	tl.mu.RLock()
-	l := tl.location
-	tl.mu.RUnlock()
-	return l
-}
-
-// MetData will hold time and location data which may be set externally if
-// this data is available. It is then inserted into mpegts packets outputted.
-var MetaData timeLocation
+// Meta allows addition of metadata to encoded mts from outside of this pkg.
+// See meta pkg for usage.
+//
+// TODO: make this not global.
+var Meta *meta.Data
 
 var (
 	patTable = standardPat.Bytes()
-	pmtTable = standardPmtTimeLocation.Bytes()
+	pmtTable = standardPmt.Bytes()
 )
 
 const (
@@ -288,33 +216,27 @@ func (e *Encoder) writePSI() error {
 	// Write PAT.
 	patPkt := Packet{
 		PUSI:    true,
-		PID:     patPid,
-		CC:      e.ccFor(patPid),
-		AFC:     hasPayload,
-		Payload: patTable,
+		PID:     PatPid,
+		CC:      e.ccFor(PatPid),
+		AFC:     HasPayload,
+		Payload: psi.AddPadding(patTable),
 	}
 	_, err := e.dst.Write(patPkt.Bytes(e.tsSpace[:PacketSize]))
 	if err != nil {
 		return err
 	}
-
-	// Update pmt table time and location.
-	err = psi.UpdateTime(pmtTable, MetaData.TimeStamp())
+	pmtTable, err = updateMeta(pmtTable)
 	if err != nil {
 		return err
 	}
-	err = psi.UpdateLocation(pmtTable, MetaData.Location())
-	if err != nil {
-		return nil
-	}
 
 	// Create mts packet from pmt table.
 	pmtPkt := Packet{
 		PUSI:    true,
-		PID:     pmtPid,
-		CC:      e.ccFor(pmtPid),
-		AFC:     hasPayload,
-		Payload: pmtTable,
+		PID:     PmtPid,
+		CC:      e.ccFor(PmtPid),
+		AFC:     HasPayload,
+		Payload: psi.AddPadding(pmtTable),
 	}
 	_, err = e.dst.Write(pmtPkt.Bytes(e.tsSpace[:PacketSize]))
 	if err != nil {
@@ -345,3 +267,11 @@ func (e *Encoder) ccFor(pid int) byte {
 	e.continuity[pid] = (cc + 1) & continuityCounterMask
 	return cc
 }
+
+// updateMeta adds/updates a metaData descriptor in the given psi bytes using data
+// contained in the global Meta struct.
+func updateMeta(b []byte) ([]byte, error) {
+	p := psi.PSIBytes(b)
+	err := p.AddDescriptor(psi.MetadataTag, Meta.Encode())
+	return []byte(p), err
+}
diff --git a/stream/rtp/encoder.go b/stream/rtp/encoder.go
index 329a24c0..20df9434 100644
--- a/stream/rtp/encoder.go
+++ b/stream/rtp/encoder.go
@@ -73,8 +73,8 @@ func NewEncoder(dst io.Writer, fps int) *Encoder {
 func (e *Encoder) Write(data []byte) (int, error) {
 	e.buffer = append(e.buffer, data...)
 	for len(e.buffer) >= sendLen {
-		e.Encode(e.buffer)
-		e.buffer = e.buffer[:0]
+		e.Encode(e.buffer[:sendLen])
+		e.buffer = e.buffer[sendLen:]
 	}
 	return len(data), nil
 }