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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| package internal | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
| "log" | ||
|
|
||
| "github.com/Eyevinn/mp4ff/bits" | ||
| "github.com/asticode/go-astits" | ||
| ) | ||
|
|
||
| // didMap maps SMPTE-20348 [did] values registered by SMPTE | ||
| // [dids]: https://smpte-ra.org/smpte-ancillary-data-smpte-st-291 | ||
| type SMPTE291Identifier struct { | ||
| did, sdid byte | ||
| } | ||
|
|
||
| var SMPTE291Map = map[SMPTE291Identifier]string{ | ||
| {0x41, 0x7}: "ANSI/SCTE 104 messages", | ||
| {0x41, 0x5}: "AFD and Bar Data", | ||
| {0x41, 0x8}: "DVB/SCTE VBI data", | ||
| {0x61, 0x1}: "EIA 708B Data mapping into VANC space", | ||
| {0x61, 0x2}: "EIA 608 Data mapping into VANC space", | ||
| } | ||
|
|
||
| type smpte2038Data struct { | ||
| PID uint16 `json:"pid"` | ||
| PTS int64 `json:"pts"` | ||
| Entries []smpte2038Entry | ||
| } | ||
|
|
||
| type smpte2038Entry struct { | ||
| LineNr byte `json:"lineNr"` | ||
| HorOffset byte `json:"horOffset"` | ||
| DID byte `json:"did"` | ||
| SDID byte `json:"sdid"` | ||
| DataCount byte `json:"dataCount"` | ||
| Type string `json:"type"` | ||
| } | ||
|
|
||
| func ParseSMPTE2038(jp *JsonPrinter, d *astits.DemuxerData, o Options) { | ||
| pl := d.PES.Data | ||
| pdtDtsIndicator := d.PES.Header.OptionalHeader.PTSDTSIndicator | ||
| if pdtDtsIndicator != 2 { | ||
| fmt.Printf("SMPTE-2038: invalid PDT_DTS_Indicator=%d\n", pdtDtsIndicator) | ||
| } | ||
| pts := d.PES.Header.OptionalHeader.PTS | ||
| rd := bytes.NewBuffer(pl) | ||
| r := bits.NewReader(rd) | ||
| smpteData := smpte2038Data{PID: d.PID, PTS: pts.Base} | ||
| for { | ||
| z := r.Read(6) | ||
| if r.AccError() == io.EOF { | ||
| break | ||
| } | ||
| if z == 0xffffffffffff { | ||
| z2 := r.Read(2) | ||
| if z2 != 0x3 { | ||
| log.Printf("SMPTE-2038: invalid stuffing\n") | ||
| return | ||
| } | ||
| _ = r.ReadRemainingBytes() | ||
| } | ||
| if z != 0 { | ||
| log.Printf("SMPTE-2038: reserved bits not zero %x\n", z) | ||
| return | ||
| } | ||
| _ = r.Read(1) // cNotYChFlag | ||
| lineNr := r.Read(11) | ||
| horOffset := r.Read(12) | ||
| did := r.Read(10) | ||
| did = did & 0xff // 8 bits | ||
| sdid := r.Read(10) | ||
| sdid = sdid & 0xff // 8 bits | ||
| didStr := SMPTE291Map[SMPTE291Identifier{byte(did), byte(sdid)}] | ||
| if didStr == "" { | ||
| didStr = "unknown SID/DID" | ||
| } | ||
| dataCount := int(r.Read(10)) & 0xff // 8 bits | ||
| for j := 0; j < dataCount; j++ { | ||
| _ = r.Read(10) | ||
| } | ||
| _ = r.Read(10) // checkSumWord | ||
| if r.NrBitsReadInCurrentByte() != 8 { | ||
| _ = r.Read(8 - r.NrBitsReadInCurrentByte()) | ||
| } | ||
| if r.AccError() != nil { | ||
| fmt.Printf("SMPTE-2038: read error\n") | ||
| return | ||
| } | ||
| smpteData.Entries = append(smpteData.Entries, smpte2038Entry{ | ||
| LineNr: byte(lineNr), | ||
| HorOffset: byte(horOffset), | ||
| DID: byte(did), | ||
| SDID: byte(sdid), | ||
| DataCount: byte(dataCount), | ||
| Type: didStr, | ||
| }) | ||
| } | ||
| if jp != nil { | ||
| jp.Print(smpteData, true) | ||
| } | ||
| } |
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