client: support publishing with opus

examples/client-publish-opus/main.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/aler9/gortsplib"
+)
+
+// This example shows how to
+// 1. generate RTP/Opus packets with Gstreamer
+// 2. connect to a RTSP server, announce an Opus track
+// 3. route the packets from Gstreamer to the server
+
+func main() {
+	// open a listener to receive RTP/Opus packets
+	pc, err := net.ListenPacket("udp", "localhost:9000")
+	if err != nil {
+		panic(err)
+	}
+	defer pc.Close()
+
+	fmt.Println("Waiting for a RTP/Opus stream on UDP port 9000 - you can send one with Gstreamer:\n" +
+		"gst-launch-1.0 audiotestsrc freq=300 ! audioconvert ! audioresample ! audio/x-raw,rate=48000" +
+		" ! opusenc" +
+		" ! rtpopuspay ! udpsink host=127.0.0.1 port=9000")
+
+	// wait for first packet
+	buf := make([]byte, 2048)
+	_, _, err = pc.ReadFrom(buf)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("stream connected")
+
+	// create an Opus track
+	track, err := gortsplib.NewTrackOpus(96, &gortsplib.TrackConfigOpus{SampleRate: 48000, ChannelCount: 2})
+	if err != nil {
+		panic(err)
+	}
+
+	// connect to the server and start publishing the track
+	conn, err := gortsplib.DialPublish("rtsp://localhost:8554/mystream",
+		gortsplib.Tracks{track})
+	if err != nil {
+		panic(err)
+	}
+	defer conn.Close()
+
+	buf = make([]byte, 2048)
+	for {
+		// read RTP packets from the source
+		n, _, err := pc.ReadFrom(buf)
+		if err != nil {
+			panic(err)
+		}
+
+		// route RTP packets to the server
+		err = conn.WriteFrame(0, gortsplib.StreamTypeRTP, buf[:n])
+		if err != nil {
+			panic(err)
+		}
+	}
+}