install go2rtc on bob

installs_on_host/go2rtc/pkg/mpegts/opus.go

@@ -0,0 +1,66 @@
+package mpegts
+
+import (
+	"github.com/AlexxIT/go2rtc/pkg/bits"
+)
+
+// opusDT - each AU from FFmpeg has 5 OPUS packets. Each packet len = 960 in the 48000 clock.
+const opusDT = 960 * ClockRate / 48000
+
+// https://opus-codec.org/docs/
+var opusInfo = []byte{ // registration_descriptor
+	0x05,               // descriptor_tag
+	0x04,               // descriptor_length
+	'O', 'p', 'u', 's', // format_identifier
+}
+
+//goland:noinspection GoSnakeCaseUsage
+func CutOPUSPacket(b []byte) (packet []byte, left []byte) {
+	r := bits.NewReader(b)
+
+	size := opus_control_header(r)
+	if size == 0 {
+		return nil, nil
+	}
+
+	packet = r.ReadBytes(size)
+	left = r.Left()
+	return
+}
+
+//goland:noinspection GoSnakeCaseUsage
+func opus_control_header(r *bits.Reader) int {
+	control_header_prefix := r.ReadBits(11)
+	if control_header_prefix != 0x3FF {
+		return 0
+	}
+
+	start_trim_flag := r.ReadBit()
+	end_trim_flag := r.ReadBit()
+	control_extension_flag := r.ReadBit()
+	_ = r.ReadBits(2) // reserved
+
+	var payload_size int
+	for {
+		i := r.ReadByte()
+		payload_size += int(i)
+		if i < 255 {
+			break
+		}
+	}
+
+	if start_trim_flag != 0 {
+		_ = r.ReadBits(3)
+		_ = r.ReadBits(13)
+	}
+	if end_trim_flag != 0 {
+		_ = r.ReadBits(3)
+		_ = r.ReadBits(13)
+	}
+	if control_extension_flag != 0 {
+		control_extension_length := r.ReadByte()
+		_ = r.ReadBytes(int(control_extension_length)) // reserved
+	}
+
+	return payload_size
+}