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psi: wrote Bytes() for TSS and almost done writing for PSI

This commit is contained in:
saxon 2018-12-06 01:28:14 +10:30
parent fa0498bc52
commit 42038a8cb9
1 changed files with 38 additions and 9 deletions
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47
stream/mts/psi/psi.go
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@ -5,6 +5,8 @@ const (
DescDefLen = 2 DescDefLen = 2
PMTDefLen = 4 PMTDefLen = 4
PATLen = 4 PATLen = 4
TSSDefLen = 5
PSIDefLen = 3
) )
// Program specific information // Program specific information
@ -16,17 +18,17 @@ type PSI struct {
pb bool // Private bit (0 for PAT, PMT, CAT) pb bool // Private bit (0 for PAT, PMT, CAT)
sl uint16 // Section length sl uint16 // Section length
tss *TSS // Table syntax section (length defined by SL) if length 0 then nil tss *TSS // Table syntax section (length defined by SL) if length 0 then nil
crc uint32 // crc32 of entire table excluding pointer field, pointer filler bytes and the trailing CRC32
} }
// Table syntax section // Table syntax section
type TSS struct { type TSS struct {
tie uint16 // Table ID extension tide uint16 // Table ID extension
v byte // Version number v byte // Version number
cni bool // Current/next indicator cni bool // Current/next indicator
sn byte // Section number sn byte // Section number
lsn byte // Last section number lsn byte // Last section number
sd SD // Specific data PAT/PMT sd SD // Specific data PAT/PMT
crc []byte // crc32 of entire table excluding pointer field, pointer filler bytes and the trailing CRC32
} }
// Specific Data, (could be PAT or PMT) // Specific Data, (could be PAT or PMT)
@ -63,15 +65,35 @@ type Desc struct {
dd []byte // Descriptor data dd []byte // Descriptor data
} }
// TODO: Implement this
func ReadPSI(data []byte) *PSI { func ReadPSI(data []byte) *PSI {
return nil return nil
} }
func (p *PSI) Bytes() (out []byte) { func (p *PSI) Bytes() []byte {
l := 1 + len(p.pfb)
out := make([]byte, l+PSIDefLen)
out[0] = p.pf
for i, b := range p.pfb {
out[1+i] = b
}
out[l] = p.tid
out[l+1] = 0x80 | 0x40 | 0x30 | (0x03 & byte(p.sl>>8))
out[l+2] = byte(p.sl)
out = append(out, p.tss.Bytes()...)
crc32 := crc32_op()
return nil return nil
} }
func (t *TSS) Fill(s []byte) { func (t *TSS) Bytes() []byte {
out := make([]byte, TSSDefLen)
out[0] = byte(t.tide >> 8)
out[1] = byte(t.tide)
out[2] = 0xc0 | (0x3e & (t.v << 1)) | (0x01 & boolToByte(t.cni))
out[3] = t.sn
out[4] = t.lsn
out = append(out, t.sd.Bytes()...)
return out
} }
func (p *PAT) Bytes() []byte { func (p *PAT) Bytes() []byte {
@ -118,3 +140,10 @@ func (e *ESSD) Bytes() []byte {
} }
return out return out
} }
func boolToByte(b bool) byte {
if b {
return 0x01
}
return 0x00
}