add *codec* to codec-related examples

examples/client-publish-codec-h264/main.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"log"
+	"net"
+
+	"github.com/aler9/gortsplib"
+	"github.com/pion/rtp"
+)
+
+// This example shows how to
+// 1. generate RTP/H264 packets with GStreamer
+// 2. connect to a RTSP server, announce an H264 track
+// 3. route the packets from GStreamer to the server
+
+func main() {
+	// open a listener to receive RTP/H264 packets
+	pc, err := net.ListenPacket("udp", "localhost:9000")
+	if err != nil {
+		panic(err)
+	}
+	defer pc.Close()
+
+	log.Println("Waiting for a RTP/H264 stream on UDP port 9000 - you can send one with GStreamer:\n" +
+		"gst-launch-1.0 videotestsrc ! video/x-raw,width=1920,height=1080" +
+		" ! x264enc speed-preset=veryfast tune=zerolatency bitrate=600000" +
+		" ! rtph264pay ! udpsink host=127.0.0.1 port=9000")
+
+	// wait for first packet
+	buf := make([]byte, 2048)
+	n, _, err := pc.ReadFrom(buf)
+	if err != nil {
+		panic(err)
+	}
+	log.Println("stream connected")
+
+	// create an H264 track
+	track := &gortsplib.TrackH264{
+		PayloadType: 96,
+	}
+
+	// connect to the server and start publishing the track
+	c := gortsplib.Client{}
+	err = c.StartPublishing("rtsp://localhost:8554/mystream",
+		gortsplib.Tracks{track})
+	if err != nil {
+		panic(err)
+	}
+	defer c.Close()
+
+	var pkt rtp.Packet
+	for {
+		// parse RTP packet
+		err = pkt.Unmarshal(buf[:n])
+		if err != nil {
+			panic(err)
+		}
+
+		// route RTP packet to the server
+		err = c.WritePacketRTP(0, &pkt, true)
+		if err != nil {
+			panic(err)
+		}
+
+		// read another RTP packet from source
+		n, _, err = pc.ReadFrom(buf)
+		if err != nil {
+			panic(err)
+		}
+	}
+}