install go2rtc on bob

installs_on_host/go2rtc/pkg/h265/helper.go

@@ -0,0 +1,76 @@
+package h265
+
+import (
+	"encoding/base64"
+	"encoding/binary"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+)
+
+const (
+	NALUTypePFrame    = 1
+	NALUTypeIFrame    = 19
+	NALUTypeIFrame2   = 20
+	NALUTypeIFrame3   = 21
+	NALUTypeVPS       = 32
+	NALUTypeSPS       = 33
+	NALUTypePPS       = 34
+	NALUTypePrefixSEI = 39
+	NALUTypeSuffixSEI = 40
+	NALUTypeFU        = 49
+)
+
+func NALUType(b []byte) byte {
+	return (b[4] >> 1) & 0x3F
+}
+
+func IsKeyframe(b []byte) bool {
+	for {
+		switch NALUType(b) {
+		case NALUTypePFrame:
+			return false
+		case NALUTypeIFrame, NALUTypeIFrame2, NALUTypeIFrame3:
+			return true
+		}
+
+		size := int(binary.BigEndian.Uint32(b)) + 4
+		if size < len(b) {
+			b = b[size:]
+			continue
+		} else {
+			return false
+		}
+	}
+}
+
+func Types(data []byte) []byte {
+	var types []byte
+	for {
+		types = append(types, NALUType(data))
+
+		size := 4 + int(binary.BigEndian.Uint32(data))
+		if size < len(data) {
+			data = data[size:]
+		} else {
+			break
+		}
+	}
+	return types
+}
+
+func GetParameterSet(fmtp string) (vps, sps, pps []byte) {
+	if fmtp == "" {
+		return
+	}
+
+	s := core.Between(fmtp, "sprop-vps=", ";")
+	vps, _ = base64.StdEncoding.DecodeString(s)
+
+	s = core.Between(fmtp, "sprop-sps=", ";")
+	sps, _ = base64.StdEncoding.DecodeString(s)
+
+	s = core.Between(fmtp, "sprop-pps=", ";")
+	pps, _ = base64.StdEncoding.DecodeString(s)
+
+	return
+}