GB28181: Support GB28181-2016 protocol. v5.0.74 (#3201)

01. Support GB config as StreamCaster.
02. Support disable GB by --gb28181=off.
03. Add utests for SIP examples.
04. Wireshark plugin to decode TCP/9000 as rtp.rfc4571
05. Support MPEGPS program stream codec.
06. Add utest for PS stream codec.
07. Decode MPEGPS packet stream.
08. Carry RTP and PS packet as helper in PS message.
09. Support recover from error mode.
10. Support process by a pack of PS/TS messages.
11. Add statistic for recovered and msgs dropped.
12. Recover from err position fastly.
13. Define state machine for GB session.
14. Bind context to GB session.
15. Re-invite when media disconnected.
16. Update GitHub actions with GB28181.
17. Support parse CANDIDATE by env or pip.
18. Support mux GB28181 to RTMP.
19. Support regression test by srs-bench.

trunk/3rdparty/srs-bench/vendor/github.com/tevino/abool/bool.go

@@ -0,0 +1,63 @@
+// Package abool provides atomic Boolean type for cleaner code and
+// better performance.
+package abool
+
+import "sync/atomic"
+
+// New creates an AtomicBool with default to false
+func New() *AtomicBool {
+	return new(AtomicBool)
+}
+
+// NewBool creates an AtomicBool with given default value
+func NewBool(ok bool) *AtomicBool {
+	ab := New()
+	if ok {
+		ab.Set()
+	}
+	return ab
+}
+
+// AtomicBool is an atomic Boolean
+// Its methods are all atomic, thus safe to be called by
+// multiple goroutines simultaneously
+// Note: When embedding into a struct, one should always use
+// *AtomicBool to avoid copy
+type AtomicBool int32
+
+// Set sets the Boolean to true
+func (ab *AtomicBool) Set() {
+	atomic.StoreInt32((*int32)(ab), 1)
+}
+
+// UnSet sets the Boolean to false
+func (ab *AtomicBool) UnSet() {
+	atomic.StoreInt32((*int32)(ab), 0)
+}
+
+// IsSet returns whether the Boolean is true
+func (ab *AtomicBool) IsSet() bool {
+	return atomic.LoadInt32((*int32)(ab)) == 1
+}
+
+// SetTo sets the boolean with given Boolean
+func (ab *AtomicBool) SetTo(yes bool) {
+	if yes {
+		atomic.StoreInt32((*int32)(ab), 1)
+	} else {
+		atomic.StoreInt32((*int32)(ab), 0)
+	}
+}
+
+// SetToIf sets the Boolean to new only if the Boolean matches the old
+// Returns whether the set was done
+func (ab *AtomicBool) SetToIf(old, new bool) (set bool) {
+	var o, n int32
+	if old {
+		o = 1
+	}
+	if new {
+		n = 1
+	}
+	return atomic.CompareAndSwapInt32((*int32)(ab), o, n)
+}