bebop: add support/example of RTP video

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/bebop.sdp

@@ -0,0 +1,3 @@
+c=IN IP4 192.168.42.1
+m=video 55004 RTP/AVP 96
+a=rtpmap:96 H264/90000

examples/bebop_rtp_video.go

@@ -0,0 +1,38 @@
+/*
+	This example will connect to the Parrot Bebop and streams the drone video
+	via the RTP protocol.
+
+	In order to run this example you will first need to connect to the drone with:
+		$ go run bebop_ps3_video.go
+
+	then in a separate terminal run this program:
+
+		$ mplayer examples/bebop.sdp
+
+	You can view the video feed by navigating to
+	http://localhost:8090/bebop.mjpeg in a web browser.
+	*NOTE* firefox works best for viewing the video feed.
+*/
+package main
+
+import (
+	"gobot.io/x/gobot"
+	"gobot.io/x/gobot/platforms/parrot/bebop"
+)
+
+func main() {
+	bebopAdaptor := bebop.NewAdaptor()
+	drone := bebop.NewDriver(bebopAdaptor)
+
+	work := func() {
+		drone.VideoEnable(true)
+	}
+
+	robot := gobot.NewRobot("drone",
+		[]gobot.Connection{bebopAdaptor},
+		[]gobot.Device{drone},
+		work,
+	)
+
+	robot.Start()
+}

platforms/parrot/bebop/client/client.go

@@ -161,6 +161,8 @@ type Bebop struct {
 	tmpFrame              tmpFrame
 	C2dPort               int
 	D2cPort               int
+	RTPStreamPort         int
+	RTPControlPort        int
 	DiscoveryPort         int
 	c2dClient             *net.UDPConn
 	d2cClient             *net.UDPConn
@@ -176,6 +178,8 @@ func New() *Bebop {
 		NavData:               make(map[string]string),
 		C2dPort:               54321,
 		D2cPort:               43210,
+		RTPStreamPort:				 55004,
+		RTPControlPort:				 55005,
 		DiscoveryPort:         44444,
 		networkFrameGenerator: networkFrameGenerator(),
 		Pcmd: Pcmd{
@@ -212,11 +216,16 @@ func (b *Bebop) Discover() error {
 
 	b.discoveryClient.Write(
 		[]byte(
-			`{
-			"controller_type": "computer",
-			"controller_name": "go-bebop",
-			"d2c_port": "43210"
-			}`,
+			fmt.Sprintf(`{
+						"controller_type": "computer",
+						"controller_name": "go-bebop",
+						"d2c_port": "%d",
+						"arstream2_client_stream_port": "%d",
+						"arstream2_client_control_port": "%d",
+						}`,
+						b.D2cPort,
+						b.RTPStreamPort,
+						b.RTPControlPort),
 		),
 	)