BIG rewrite stream info

pkg/stdin/backchannel.go

@@ -0,0 +1,63 @@
+package stdin
+
+import (
+	"encoding/json"
+	"errors"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+func (c *Client) GetMedias() []*core.Media {
+	return c.medias
+}
+
+func (c *Client) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error) {
+	return nil, core.ErrCantGetTrack
+}
+
+func (c *Client) AddTrack(media *core.Media, _ *core.Codec, track *core.Receiver) error {
+	if c.sender == nil {
+		stdin, err := c.cmd.StdinPipe()
+		if err != nil {
+			return err
+		}
+
+		c.sender = core.NewSender(media, track.Codec)
+		c.sender.Handler = func(packet *rtp.Packet) {
+			_, _ = stdin.Write(packet.Payload)
+			c.send += len(packet.Payload)
+		}
+	}
+
+	c.sender.HandleRTP(track)
+	return nil
+}
+
+func (c *Client) Start() (err error) {
+	return c.cmd.Run()
+}
+
+func (c *Client) Stop() (err error) {
+	if c.sender != nil {
+		c.sender.Close()
+	}
+	if c.cmd.Process == nil {
+		return nil
+	}
+	return errors.Join(c.cmd.Process.Kill(), c.cmd.Wait())
+}
+
+func (c *Client) MarshalJSON() ([]byte, error) {
+	info := &core.Connection{
+		ID:         core.ID(c),
+		FormatName: "exec",
+		Protocol:   "pipe",
+		Medias:     c.medias,
+		Send:       c.send,
+	}
+	if c.sender != nil {
+		info.Senders = []*core.Sender{c.sender}
+	}
+	return json.Marshal(info)
+}