install go2rtc on bob

installs_on_host/go2rtc/pkg/magic/mjpeg/producer.go

@@ -0,0 +1,78 @@
+package mjpeg
+
+import (
+	"bytes"
+	"io"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+type Producer struct {
+	core.Connection
+	rd *core.ReadBuffer
+}
+
+func Open(rd io.Reader) (*Producer, error) {
+	medias := []*core.Media{
+		{
+			Kind:      core.KindVideo,
+			Direction: core.DirectionRecvonly,
+			Codecs: []*core.Codec{
+				{
+					Name:        core.CodecJPEG,
+					ClockRate:   90000,
+					PayloadType: core.PayloadTypeRAW,
+				},
+			},
+		},
+	}
+	return &Producer{
+		Connection: core.Connection{
+			ID:         core.NewID(),
+			FormatName: "mjpeg",
+			Medias:     medias,
+			Transport:  rd,
+		},
+		rd: core.NewReadBuffer(rd),
+	}, nil
+}
+
+func (c *Producer) Start() error {
+	var buf []byte                     // total bufer
+	b := make([]byte, core.BufferSize) // reading buffer
+
+	for {
+		// one JPEG end and next start
+		i := bytes.Index(buf, []byte{0xFF, 0xD9, 0xFF, 0xD8})
+		if i < 0 {
+			n, err := c.rd.Read(b)
+			if err != nil {
+				return err
+			}
+
+			c.Recv += n
+
+			buf = append(buf, b[:n]...)
+
+			// if we receive frame
+			if n >= 2 && b[n-2] == 0xFF && b[n-1] == 0xD9 {
+				i = len(buf)
+			} else {
+				continue
+			}
+		} else {
+			i += 2
+		}
+
+		pkt := &rtp.Packet{
+			Header:  rtp.Header{Timestamp: core.Now90000()},
+			Payload: buf[:i],
+		}
+		c.Receivers[0].WriteRTP(pkt)
+
+		//log.Printf("[mjpeg] ts=%d size=%d", pkt.Header.Timestamp, len(pkt.Payload))
+
+		buf = buf[i:]
+	}
+}