直播：后台 JWT 推流、前台画中画；WebRTC 服务与 Nginx WebSocket 代理

Made-with: Cursor

server/vendor/github.com/pion/sctp/param_zero_checksum.go

@@ -0,0 +1,56 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp
+
+import (
+	"encoding/binary"
+	"errors"
+)
+
+//  This parameter is used to inform the receiver that a sender is willing to
+//  accept zero as checksum if some other error detection method is used
+//  instead.
+//
+//  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
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |   Type = 0x8001 (suggested)   |          Length = 8           |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |           Error Detection Method Identifier (EDMID)           |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+type paramZeroChecksumAcceptable struct {
+	paramHeader
+	// The Error Detection Method Identifier (EDMID) specifies an alternate
+	// error detection method the sender of this parameter is willing to use for
+	// received packets.
+	edmid uint32
+}
+
+// Zero Checksum parameter error
+var (
+	ErrZeroChecksumParamTooShort = errors.New("zero checksum parameter too short")
+)
+
+const (
+	dtlsErrorDetectionMethod uint32 = 1
+)
+
+func (r *paramZeroChecksumAcceptable) marshal() ([]byte, error) {
+	r.typ = zeroChecksumAcceptable
+	r.raw = make([]byte, 4)
+	binary.BigEndian.PutUint32(r.raw, r.edmid)
+	return r.paramHeader.marshal()
+}
+
+func (r *paramZeroChecksumAcceptable) unmarshal(raw []byte) (param, error) {
+	err := r.paramHeader.unmarshal(raw)
+	if err != nil {
+		return nil, err
+	}
+	if len(r.raw) < 4 {
+		return nil, ErrZeroChecksumParamTooShort
+	}
+	r.edmid = binary.BigEndian.Uint32(r.raw)
+	return r, nil
+}