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/README.md

@@ -0,0 +1,49 @@
+# ABool :bulb:
+[![Go Report Card](https://goreportcard.com/badge/github.com/tevino/abool)](https://goreportcard.com/report/github.com/tevino/abool)
+[![GoDoc](https://godoc.org/github.com/tevino/abool?status.svg)](https://godoc.org/github.com/tevino/abool)
+
+Atomic Boolean library for Go, optimized for performance yet simple to use.
+
+Use this for cleaner code.
+
+## Usage
+
+```go
+import "github.com/tevino/abool"
+
+cond := abool.New()  // default to false
+
+cond.Set()                 // Set to true
+cond.IsSet()               // Returns true
+cond.UnSet()               // Set to false
+cond.SetTo(true)           // Set to whatever you want
+cond.SetToIf(false, true)  // Set to true if it is false, returns false(not set)
+
+
+// embedding
+type Foo struct {
+    cond *abool.AtomicBool  // always use pointer to avoid copy
+}
+```
+
+## Benchmark:
+
+- Go 1.6.2
+- OS X 10.11.4
+
+```shell
+# Read
+BenchmarkMutexRead-4       	100000000	        21.0 ns/op
+BenchmarkAtomicValueRead-4 	200000000	         6.30 ns/op
+BenchmarkAtomicBoolRead-4  	300000000	         4.21 ns/op  # <--- This package
+
+# Write
+BenchmarkMutexWrite-4      	100000000	        21.6 ns/op
+BenchmarkAtomicValueWrite-4	 30000000	        43.4 ns/op
+BenchmarkAtomicBoolWrite-4 	200000000	         9.87 ns/op  # <--- This package
+
+# CAS
+BenchmarkMutexCAS-4        	 30000000	        44.9 ns/op
+BenchmarkAtomicBoolCAS-4   	100000000	        11.7 ns/op   # <--- This package
+```
+