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psi: starting to remove psi stuff from encoder.go and put into psi package

This commit is contained in:
saxon 2018-12-10 17:44:56 +10:30
parent 9e7b65ac6a
commit 43abed9522
1 changed files with 8 additions and 55 deletions
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63
stream/mts/encoder.go
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@ -36,6 +36,12 @@ import (
"time"
"bitbucket.org/ausocean/av/stream/mts/pes"
"bitbucket.org/ausocean/av/stream/mts/psi"
)
var (
patTable []byte
pmtTable []byte
)
const (
@ -43,66 +49,13 @@ const (
psiSendCount = 100
)
// TODO: Finish off mts/psi so that we can create pat and pmt tables instead
// of hardcoding.
var (
patTable = []byte{
0x00, // pointer
// ---- section included in data sent to CRC32 during check
// table header
0x00, // table id
0xb0, // section syntax indicator:1|private bit:1|reserved:2|section length:2|more bytes...:2
0x0d, // more bytes...
// syntax section
0x00, 0x01, // table id extension
0xc1, // reserved bits:3|version:5|use now:1
0x00, // section number
0x00, // last section number
// table data
0x00, 0x01, // Program number
0xf0, 0x00, // reserved:3|program map PID:13
// 0x2a, 0xb1, 0x04, 0xb2, // CRC
// ----
}
pmtTable = []byte{
0x00, // pointer
// ---- section included in data sent to CRC32 during check
// table header
0x02, // table id
0xb0, // section syntax indicator:1|private bit:1|reserved:2|section length:2|more bytes...:2
0x12, // more bytes...
// syntax section
0x00, 0x01, // table id extension
0xc1, // reserved bits:3|version:5|use now:1
0x00, // section number
0x00, // last section number
// table data
0xe1, 0x00, // reserved:3|PCR PID:13
0xf0, 0x00, // reserved:4|unused:2|program info length:10
// No program descriptors since program info length is 0.
// elementary stream info data
0x1b, // stream type
0xe1, 0x00, // reserved:3|elementary PID:13
0xf0, 0x00, // reserved:4|unused:2|ES info length:10
// No elementary stream descriptors since ES info length is 0.
// 0x15, 0xbd, 0x4d, 0x56, // CRC
// ----
}
)
func init() {
// Generate IEEE polynomial table
// for the big-endian algorithm.
crcTable := crc32_MakeTable(bits.Reverse32(crc32.IEEE))
patTable = completePSI(patTable, crcTable)
pmtTable = completePSI(pmtTable, crcTable)
patTable = completePSI(psi.StdPat, crcTable)
pmtTable = completePSI(psi.StdPmt, crcTable)
}
func completePSI(psi []byte, tab *crc32.Table) []byte {