install go2rtc on bob

installs_on_host/go2rtc/pkg/wav/backchannel.go

@@ -0,0 +1,67 @@
+package wav
+
+import (
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/shell"
+	"github.com/pion/rtp"
+)
+
+type Backchannel struct {
+	core.Connection
+	cmd *shell.Command
+}
+
+func NewBackchannel(cmd *shell.Command) (core.Producer, error) {
+	medias := []*core.Media{
+		{
+			Kind:      core.KindAudio,
+			Direction: core.DirectionSendonly,
+			Codecs: []*core.Codec{
+				//{Name: core.CodecPCML},
+				{Name: core.CodecPCMA},
+				{Name: core.CodecPCMU},
+			},
+		},
+	}
+
+	return &Backchannel{
+		Connection: core.Connection{
+			ID:         core.NewID(),
+			FormatName: "wav",
+			Protocol:   "pipe",
+			Medias:     medias,
+			Transport:  cmd,
+		},
+		cmd: cmd,
+	}, nil
+}
+
+func (c *Backchannel) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error) {
+	return nil, core.ErrCantGetTrack
+}
+
+func (c *Backchannel) AddTrack(media *core.Media, codec *core.Codec, track *core.Receiver) error {
+	wr, err := c.cmd.StdinPipe()
+	if err != nil {
+		return err
+	}
+
+	b := Header(track.Codec)
+	if _, err = wr.Write(b); err != nil {
+		return err
+	}
+
+	sender := core.NewSender(media, track.Codec)
+	sender.Handler = func(packet *rtp.Packet) {
+		if n, err := wr.Write(packet.Payload); err != nil {
+			c.Send += n
+		}
+	}
+	sender.HandleRTP(track)
+	c.Senders = append(c.Senders, sender)
+	return nil
+}
+
+func (c *Backchannel) Start() error {
+	return c.cmd.Run()
+}