add client-read-h264 example

examples/client-read-h264/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/aler9/gortsplib"
+	"github.com/aler9/gortsplib/pkg/rtph264"
+)
+
+// This example shows how to
+// 1. connect to a RTSP server and read all tracks on a path
+// 2. check whether there's a H264 track
+// 3. get H264 NALUs of that track
+
+func main() {
+	// connect to the server and start reading all tracks
+	conn, err := gortsplib.DialRead("rtsp://localhost:8554/mystream")
+	if err != nil {
+		panic(err)
+	}
+	defer conn.Close()
+
+	// check whether there's a H264 track
+	h264Track := func() int {
+		for _, track := range conn.Tracks() {
+			if track.IsH264() {
+				return track.ID
+			}
+		}
+		return -1
+	}()
+	if h264Track < 0 {
+		panic(fmt.Errorf("H264 track not found"))
+	}
+	fmt.Printf("H264 track is number %d\n", h264Track+1)
+
+	// instantiate a decoder
+	dec := rtph264.NewDecoder()
+
+	// get H264 NALUs of that track
+	err = <-conn.ReadFrames(func(trackID int, typ gortsplib.StreamType, buf []byte) {
+		if trackID == h264Track {
+			nt, err := dec.Decode(buf)
+			if err != nil {
+				return
+			}
+
+			fmt.Printf("received H264 NALU of size %d\n", len(nt.NALU))
+		}
+	})
+	panic(err)
+}