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/gobwas/httphead/README.md

@@ -0,0 +1,63 @@
+# httphead.[go](https://golang.org)
+
+[![GoDoc][godoc-image]][godoc-url] 
+
+> Tiny HTTP header value parsing library in go.
+
+## Overview
+
+This library contains low-level functions for scanning HTTP RFC2616 compatible header value grammars.
+
+## Install
+
+```shell
+    go get github.com/gobwas/httphead
+```
+
+## Example
+
+The example below shows how multiple-choise HTTP header value could be parsed with this library:
+
+```go
+	options, ok := httphead.ParseOptions([]byte(`foo;bar=1,baz`), nil)
+	fmt.Println(options, ok)
+	// Output: [{foo map[bar:1]} {baz map[]}] true
+```
+
+The low-level example below shows how to optimize keys skipping and selection
+of some key:
+
+```go
+	// The right part of full header line like:
+	// X-My-Header: key;foo=bar;baz,key;baz
+	header := []byte(`foo;a=0,foo;a=1,foo;a=2,foo;a=3`)
+
+	// We want to search key "foo" with an "a" parameter that equal to "2".
+	var (
+		foo = []byte(`foo`)
+		a   = []byte(`a`)
+		v   = []byte(`2`)
+	)
+	var found bool
+	httphead.ScanOptions(header, func(i int, key, param, value []byte) Control {
+		if !bytes.Equal(key, foo) {
+			return ControlSkip
+		}
+		if !bytes.Equal(param, a) {
+			if bytes.Equal(value, v) {
+				// Found it!
+				found = true
+				return ControlBreak
+			}
+			return ControlSkip
+		}
+		return ControlContinue
+	})
+```
+
+For more usage examples please see [docs][godoc-url] or package tests.
+
+[godoc-image]: https://godoc.org/github.com/gobwas/httphead?status.svg
+[godoc-url]: https://godoc.org/github.com/gobwas/httphead
+[travis-image]: https://travis-ci.org/gobwas/httphead.svg?branch=master
+[travis-url]: https://travis-ci.org/gobwas/httphead