直播：后台 JWT 推流、前台画中画；WebRTC 服务与 Nginx WebSocket 代理
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212
server/vendor/github.com/pion/sctp/chunk_payload_data.go
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212
server/vendor/github.com/pion/sctp/chunk_payload_data.go
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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
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// SPDX-License-Identifier: MIT
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package sctp
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"time"
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)
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/*
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chunkPayloadData represents an SCTP Chunk of type DATA
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type = 0 | Reserved|U|B|E| Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| TSN |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Stream Identifier S | Stream Sequence Number n |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Payload Protocol Identifier |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| |
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| User Data (seq n of Stream S) |
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| |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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An unfragmented user message shall have both the B and E bits set to
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'1'. Setting both B and E bits to '0' indicates a middle fragment of
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a multi-fragment user message, as summarized in the following table:
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B E Description
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============================================================
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| 1 0 | First piece of a fragmented user message |
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+----------------------------------------------------------+
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| 0 0 | Middle piece of a fragmented user message |
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+----------------------------------------------------------+
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| 0 1 | Last piece of a fragmented user message |
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+----------------------------------------------------------+
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| 1 1 | Unfragmented message |
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============================================================
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| Table 1: Fragment Description Flags |
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============================================================
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*/
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type chunkPayloadData struct {
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chunkHeader
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unordered bool
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beginningFragment bool
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endingFragment bool
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immediateSack bool
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tsn uint32
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streamIdentifier uint16
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streamSequenceNumber uint16
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payloadType PayloadProtocolIdentifier
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userData []byte
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// Whether this data chunk was acknowledged (received by peer)
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acked bool
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missIndicator uint32
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// Partial-reliability parameters used only by sender
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since time.Time
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nSent uint32 // number of transmission made for this chunk
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_abandoned bool
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_allInflight bool // valid only with the first fragment
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// Retransmission flag set when T1-RTX timeout occurred and this
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// chunk is still in the inflight queue
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retransmit bool
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head *chunkPayloadData // link to the head of the fragment
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}
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const (
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payloadDataEndingFragmentBitmask = 1
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payloadDataBeginingFragmentBitmask = 2
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payloadDataUnorderedBitmask = 4
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payloadDataImmediateSACK = 8
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payloadDataHeaderSize = 12
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)
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// PayloadProtocolIdentifier is an enum for DataChannel payload types
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type PayloadProtocolIdentifier uint32
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// PayloadProtocolIdentifier enums
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// https://www.iana.org/assignments/sctp-parameters/sctp-parameters.xhtml#sctp-parameters-25
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const (
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PayloadTypeUnknown PayloadProtocolIdentifier = 0
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PayloadTypeWebRTCDCEP PayloadProtocolIdentifier = 50
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PayloadTypeWebRTCString PayloadProtocolIdentifier = 51
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PayloadTypeWebRTCBinary PayloadProtocolIdentifier = 53
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PayloadTypeWebRTCStringEmpty PayloadProtocolIdentifier = 56
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PayloadTypeWebRTCBinaryEmpty PayloadProtocolIdentifier = 57
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)
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// Data chunk errors
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var (
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ErrChunkPayloadSmall = errors.New("packet is smaller than the header size")
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)
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func (p PayloadProtocolIdentifier) String() string {
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switch p {
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case PayloadTypeWebRTCDCEP:
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return "WebRTC DCEP"
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case PayloadTypeWebRTCString:
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return "WebRTC String"
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case PayloadTypeWebRTCBinary:
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return "WebRTC Binary"
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case PayloadTypeWebRTCStringEmpty:
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return "WebRTC String (Empty)"
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case PayloadTypeWebRTCBinaryEmpty:
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return "WebRTC Binary (Empty)"
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default:
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return fmt.Sprintf("Unknown Payload Protocol Identifier: %d", p)
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}
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}
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func (p *chunkPayloadData) unmarshal(raw []byte) error {
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if err := p.chunkHeader.unmarshal(raw); err != nil {
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return err
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}
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p.immediateSack = p.flags&payloadDataImmediateSACK != 0
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p.unordered = p.flags&payloadDataUnorderedBitmask != 0
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p.beginningFragment = p.flags&payloadDataBeginingFragmentBitmask != 0
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p.endingFragment = p.flags&payloadDataEndingFragmentBitmask != 0
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if len(p.raw) < payloadDataHeaderSize {
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return ErrChunkPayloadSmall
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}
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p.tsn = binary.BigEndian.Uint32(p.raw[0:])
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p.streamIdentifier = binary.BigEndian.Uint16(p.raw[4:])
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p.streamSequenceNumber = binary.BigEndian.Uint16(p.raw[6:])
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p.payloadType = PayloadProtocolIdentifier(binary.BigEndian.Uint32(p.raw[8:]))
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p.userData = p.raw[payloadDataHeaderSize:]
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return nil
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}
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func (p *chunkPayloadData) marshal() ([]byte, error) {
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payRaw := make([]byte, payloadDataHeaderSize+len(p.userData))
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binary.BigEndian.PutUint32(payRaw[0:], p.tsn)
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binary.BigEndian.PutUint16(payRaw[4:], p.streamIdentifier)
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binary.BigEndian.PutUint16(payRaw[6:], p.streamSequenceNumber)
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binary.BigEndian.PutUint32(payRaw[8:], uint32(p.payloadType))
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copy(payRaw[payloadDataHeaderSize:], p.userData)
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flags := uint8(0)
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if p.endingFragment {
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flags = 1
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}
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if p.beginningFragment {
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flags |= 1 << 1
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}
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if p.unordered {
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flags |= 1 << 2
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}
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if p.immediateSack {
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flags |= 1 << 3
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}
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p.chunkHeader.flags = flags
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p.chunkHeader.typ = ctPayloadData
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p.chunkHeader.raw = payRaw
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return p.chunkHeader.marshal()
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}
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func (p *chunkPayloadData) check() (abort bool, err error) {
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return false, nil
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}
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// String makes chunkPayloadData printable
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func (p *chunkPayloadData) String() string {
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return fmt.Sprintf("%s\n%d", p.chunkHeader, p.tsn)
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}
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func (p *chunkPayloadData) abandoned() bool {
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if p.head != nil {
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return p.head._abandoned && p.head._allInflight
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}
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return p._abandoned && p._allInflight
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}
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func (p *chunkPayloadData) setAbandoned(abandoned bool) {
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if p.head != nil {
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p.head._abandoned = abandoned
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return
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}
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p._abandoned = abandoned
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}
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func (p *chunkPayloadData) setAllInflight() {
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if p.endingFragment {
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if p.head != nil {
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p.head._allInflight = true
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} else {
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p._allInflight = true
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}
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}
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}
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func (p *chunkPayloadData) isFragmented() bool {
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return !(p.head == nil && p.beginningFragment && p.endingFragment)
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}
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