install go2rtc on bob

installs_on_host/go2rtc/pkg/wyoming/backchannel.go

@@ -0,0 +1,63 @@
+package wyoming
+
+import (
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+type Backchannel struct {
+	core.Connection
+	api *API
+}
+
+func newBackchannel(conn net.Conn) *Backchannel {
+	return &Backchannel{
+		core.Connection{
+			ID:         core.NewID(),
+			FormatName: "wyoming",
+			Medias: []*core.Media{
+				{
+					Kind:      core.KindAudio,
+					Direction: core.DirectionSendonly,
+					Codecs: []*core.Codec{
+						{Name: core.CodecPCML, ClockRate: 22050},
+					},
+				},
+			},
+			Transport: conn,
+		},
+		NewAPI(conn),
+	}
+}
+
+func (b *Backchannel) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error) {
+	return nil, core.ErrCantGetTrack
+}
+
+func (b *Backchannel) AddTrack(media *core.Media, codec *core.Codec, track *core.Receiver) error {
+	sender := core.NewSender(media, codec)
+	sender.Handler = func(pkt *rtp.Packet) {
+		ts := time.Now().Nanosecond()
+		evt := &Event{
+			Type:    "audio-chunk",
+			Data:    fmt.Sprintf(`{"rate":22050,"width":2,"channels":1,"timestamp":%d}`, ts),
+			Payload: pkt.Payload,
+		}
+		_ = b.api.WriteEvent(evt)
+	}
+	sender.HandleRTP(track)
+	b.Senders = append(b.Senders, sender)
+	return nil
+}
+
+func (b *Backchannel) Start() error {
+	for {
+		if _, err := b.api.ReadEvent(); err != nil {
+			return err
+		}
+	}
+}