install go2rtc on bob

installs_on_host/go2rtc/pkg/wav/producer.go

@@ -0,0 +1,83 @@
+package wav
+
+import (
+	"bufio"
+	"errors"
+	"io"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/pion/rtp"
+)
+
+const FourCC = "RIFF"
+
+func Open(r io.Reader) (*Producer, error) {
+	// https://en.wikipedia.org/wiki/WAV
+	// https://www.mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html
+	rd := bufio.NewReaderSize(r, core.BufferSize)
+
+	codec, err := ReadHeader(r)
+	if err != nil {
+		return nil, err
+	}
+
+	if codec.Name == "" {
+		return nil, errors.New("waw: unsupported codec")
+	}
+
+	medias := []*core.Media{
+		{
+			Kind:      core.KindAudio,
+			Direction: core.DirectionRecvonly,
+			Codecs:    []*core.Codec{codec},
+		},
+	}
+	return &Producer{
+		Connection: core.Connection{
+			ID:         core.NewID(),
+			FormatName: "wav",
+			Medias:     medias,
+			Transport:  r,
+		},
+		rd: rd,
+	}, nil
+}
+
+type Producer struct {
+	core.Connection
+	rd *bufio.Reader
+}
+
+func (c *Producer) Start() error {
+	var seq uint16
+	var ts uint32
+
+	const PacketSize = 0.040 * 8000 // 40ms
+
+	for {
+		payload := make([]byte, PacketSize)
+		if _, err := io.ReadFull(c.rd, payload); err != nil {
+			return err
+		}
+
+		c.Recv += PacketSize
+
+		if len(c.Receivers) == 0 {
+			continue
+		}
+
+		pkt := &rtp.Packet{
+			Header: rtp.Header{
+				Version:        2,
+				Marker:         true,
+				SequenceNumber: seq,
+				Timestamp:      ts,
+			},
+			Payload: payload,
+		}
+		c.Receivers[0].WriteRTP(pkt)
+
+		seq++
+		ts += PacketSize
+	}
+}