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/sdp/v3/common_description.go

@@ -0,0 +1,188 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sdp
+
+import (
+	"strconv"
+)
+
+// Information describes the "i=" field which provides textual information
+// about the session.
+type Information string
+
+func (i Information) String() string {
+	return stringFromMarshal(i.marshalInto, i.marshalSize)
+}
+
+func (i Information) marshalInto(b []byte) []byte {
+	return append(b, i...)
+}
+
+func (i Information) marshalSize() (size int) {
+	return len(i)
+}
+
+// ConnectionInformation defines the representation for the "c=" field
+// containing connection data.
+type ConnectionInformation struct {
+	NetworkType string
+	AddressType string
+	Address     *Address
+}
+
+func (c ConnectionInformation) String() string {
+	return stringFromMarshal(c.marshalInto, c.marshalSize)
+}
+
+func (c ConnectionInformation) marshalInto(b []byte) []byte {
+	b = append(append(b, c.NetworkType...), ' ')
+	b = append(b, c.AddressType...)
+
+	if c.Address != nil {
+		b = append(b, ' ')
+		b = c.Address.marshalInto(b)
+	}
+
+	return b
+}
+
+func (c ConnectionInformation) marshalSize() (size int) {
+	size = len(c.NetworkType)
+	size += 1 + len(c.AddressType)
+	if c.Address != nil {
+		size += 1 + c.Address.marshalSize()
+	}
+
+	return
+}
+
+// Address desribes a structured address token from within the "c=" field.
+type Address struct {
+	Address string
+	TTL     *int
+	Range   *int
+}
+
+func (c *Address) String() string {
+	return stringFromMarshal(c.marshalInto, c.marshalSize)
+}
+
+func (c *Address) marshalInto(b []byte) []byte {
+	b = append(b, c.Address...)
+	if c.TTL != nil {
+		b = append(b, '/')
+		b = strconv.AppendInt(b, int64(*c.TTL), 10)
+	}
+	if c.Range != nil {
+		b = append(b, '/')
+		b = strconv.AppendInt(b, int64(*c.Range), 10)
+	}
+
+	return b
+}
+
+func (c Address) marshalSize() (size int) {
+	size = len(c.Address)
+	if c.TTL != nil {
+		size += 1 + lenUint(uint64(*c.TTL))
+	}
+	if c.Range != nil {
+		size += 1 + lenUint(uint64(*c.Range))
+	}
+
+	return
+}
+
+// Bandwidth describes an optional field which denotes the proposed bandwidth
+// to be used by the session or media.
+type Bandwidth struct {
+	Experimental bool
+	Type         string
+	Bandwidth    uint64
+}
+
+func (b Bandwidth) String() string {
+	return stringFromMarshal(b.marshalInto, b.marshalSize)
+}
+
+func (b Bandwidth) marshalInto(d []byte) []byte {
+	if b.Experimental {
+		d = append(d, "X-"...)
+	}
+	d = append(append(d, b.Type...), ':')
+	return strconv.AppendUint(d, b.Bandwidth, 10)
+}
+
+func (b Bandwidth) marshalSize() (size int) {
+	if b.Experimental {
+		size += 2
+	}
+
+	size += len(b.Type) + 1 + lenUint(b.Bandwidth)
+	return
+}
+
+// EncryptionKey describes the "k=" which conveys encryption key information.
+type EncryptionKey string
+
+func (e EncryptionKey) String() string {
+	return stringFromMarshal(e.marshalInto, e.marshalSize)
+}
+
+func (e EncryptionKey) marshalInto(b []byte) []byte {
+	return append(b, e...)
+}
+
+func (e EncryptionKey) marshalSize() (size int) {
+	return len(e)
+}
+
+// Attribute describes the "a=" field which represents the primary means for
+// extending SDP.
+type Attribute struct {
+	Key   string
+	Value string
+}
+
+// NewPropertyAttribute constructs a new attribute
+func NewPropertyAttribute(key string) Attribute {
+	return Attribute{
+		Key: key,
+	}
+}
+
+// NewAttribute constructs a new attribute
+func NewAttribute(key, value string) Attribute {
+	return Attribute{
+		Key:   key,
+		Value: value,
+	}
+}
+
+func (a Attribute) String() string {
+	return stringFromMarshal(a.marshalInto, a.marshalSize)
+}
+
+func (a Attribute) marshalInto(b []byte) []byte {
+	b = append(b, a.Key...)
+	if len(a.Value) > 0 {
+		b = append(append(b, ':'), a.Value...)
+	}
+
+	return b
+}
+
+func (a Attribute) marshalSize() (size int) {
+	size = len(a.Key)
+	if len(a.Value) > 0 {
+		size += 1 + len(a.Value)
+	}
+
+	return size
+}
+
+// IsICECandidate returns true if the attribute key equals "candidate".
+func (a Attribute) IsICECandidate() bool {
+	return a.Key == "candidate"
+}