new client api

README.md

@@ -9,17 +9,21 @@ RTSP 1.0 client and server library for the Go programming language, written for
 
 Features:
 
-* Read streams from servers with TCP or UDP
+* Client
-* Publish streams to servers with TCP or UDP
+  * Query servers about published streams
-* Build servers
+  * Read streams from servers with UDP or TCP
-* Provides most methods and primitives of the protocol
+  * Publish streams to servers with UDP or TCP
+  * Pause reading or publishing without disconnecting from the server
+* Server
+  * Handle server-side connections
 
 ## Examples
 
-* [client-read-tcp](examples/client-read-tcp.go)
+* [client-query](examples/client-query.go)
 * [client-read-udp](examples/client-read-udp.go)
-* [client-publish-tcp](examples/client-publish-tcp.go)
+* [client-read-tcp](examples/client-read-tcp.go)
 * [client-publish-udp](examples/client-publish-udp.go)
+* [client-publish-tcp](examples/client-publish-tcp.go)
 
 ## Documentation
 

connclient.go

@@ -34,7 +34,7 @@ const (
 	clientUDPFrameReadBufferSize = 2048
 )
 
-type connClientState int
+type connClientState int32
 
 const (
 	connClientStateInitial connClientState = iota
@@ -42,8 +42,34 @@ const (
 	connClientStatePlay
 	connClientStatePreRecord
 	connClientStateRecord
+	connClientStateUDPError
 )
 
+func (s connClientState) String() string {
+	switch s {
+	case connClientStateInitial:
+		return "initial"
+	case connClientStatePrePlay:
+		return "prePlay"
+	case connClientStatePlay:
+		return "play"
+	case connClientStatePreRecord:
+		return "preRecord"
+	case connClientStateRecord:
+		return "record"
+	case connClientStateUDPError:
+		return "udpError"
+	}
+	return "uknown"
+}
+func (s *connClientState) load() connClientState {
+	return connClientState(atomic.LoadInt32((*int32)(s)))
+}
+
+func (s *connClientState) store(v connClientState) {
+	atomic.StoreInt32((*int32)(s), int32(v))
+}
+
 // ConnClient is a client-side RTSP connection.
 type ConnClient struct {
 	d                     Dialer
@@ -53,7 +79,7 @@ type ConnClient struct {
 	session               string
 	cseq                  int
 	auth                  *auth.Client
-	state                 connClientState
+	state                 *connClientState
 	streamUrl             *base.URL
 	streamProtocol        *StreamProtocol
 	tracks                Tracks
@@ -64,18 +90,23 @@ type ConnClient struct {
 	response              *base.Response
 	frame                 *base.InterleavedFrame
 	tcpFrameBuffer        *multibuffer.MultiBuffer
+	readFrameFunc         func() (int, StreamType, []byte, error)
 	writeFrameFunc        func(trackId int, streamType StreamType, content []byte) error
 	getParameterSupported bool
+	backgroundUDPError    error
 
-	reportWriterTerminate chan struct{}
+	backgroundTerminate chan struct{}
-	reportWriterDone      chan struct{}
+	backgroundDone      chan struct{}
+	udpFrame            chan base.InterleavedFrame
 }
 
 // Close closes all the ConnClient resources.
 func (c *ConnClient) Close() error {
-	if c.state == connClientStatePlay {
+	s := c.state.load()
-		close(c.reportWriterTerminate)
+
-		<-c.reportWriterDone
+	if s == connClientStatePlay {
+		close(c.backgroundTerminate)
+		<-c.backgroundDone
 
 		c.Do(&base.Request{
 			Method:       base.TEARDOWN,
@@ -84,7 +115,14 @@ func (c *ConnClient) Close() error {
 		})
 	}
 
-	err := c.nconn.Close()
+	if s == connClientStatePlay {
+		if *c.streamProtocol == StreamProtocolUDP {
+			go func() {
+				for range c.udpFrame {
+				}
+			}()
+		}
+	}
 
 	for _, l := range c.udpRtpListeners {
 		l.close()
@@ -94,16 +132,28 @@ func (c *ConnClient) Close() error {
 		l.close()
 	}
 
+	if s == connClientStatePlay {
+		if *c.streamProtocol == StreamProtocolUDP {
+			close(c.udpFrame)
+		}
+	}
+
+	err := c.nconn.Close()
 	return err
 }
 
-func (c *ConnClient) checkState(allowed map[connClientState]struct{}) error {
+func (c *ConnClient) checkState(allowed map[connClientState]struct{}) (connClientState, error) {
-	if _, ok := allowed[c.state]; ok {
+	s := c.state.load()
-		return nil
+	if _, ok := allowed[s]; ok {
+		return s, nil
 	}
 
-	return fmt.Errorf("client must be in state %v, while is in state %v",
+	var allowedList []connClientState
-		allowed, c.state)
+	for s := range allowed {
+		allowedList = append(allowedList, s)
+	}
+	return 0, fmt.Errorf("client must be in state %v, while is in state %v",
+		allowedList, s)
 }
 
 // NetConn returns the underlying net.Conn.
@@ -123,68 +173,8 @@ func (c *ConnClient) readFrameTCPOrResponse() (interface{}, error) {
 	return base.ReadInterleavedFrameOrResponse(c.frame, c.response, c.br)
 }
 
-// ReadFrameUDP reads an UDP frame.
-func (c *ConnClient) ReadFrameUDP(trackId int, streamType StreamType) ([]byte, error) {
-	var buf []byte
-	var err error
-	if streamType == StreamTypeRtp {
-		buf, err = c.udpRtpListeners[trackId].read()
-	} else {
-		buf, err = c.udpRtcpListeners[trackId].read()
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	atomic.StoreInt64(c.udpLastFrameTimes[trackId], time.Now().Unix())
-
-	c.rtcpReceivers[trackId].OnFrame(streamType, buf)
-
-	return buf, nil
-}
-
-// ReadFrameTCP reads an InterleavedFrame.
-// This can't be used when publishing.
-func (c *ConnClient) ReadFrameTCP() (int, StreamType, []byte, error) {
-	c.frame.Content = c.tcpFrameBuffer.Next()
-
-	c.nconn.SetReadDeadline(time.Now().Add(c.d.ReadTimeout))
-	err := c.frame.Read(c.br)
-	if err != nil {
-		return 0, 0, nil, err
-	}
-
-	c.rtcpReceivers[c.frame.TrackId].OnFrame(c.frame.StreamType, c.frame.Content)
-
-	return c.frame.TrackId, c.frame.StreamType, c.frame.Content, nil
-}
-
-func (c *ConnClient) writeFrameUDP(trackId int, streamType StreamType, content []byte) error {
-	if streamType == StreamTypeRtp {
-		return c.udpRtpListeners[trackId].write(content)
-	}
-	return c.udpRtcpListeners[trackId].write(content)
-}
-
-func (c *ConnClient) writeFrameTCP(trackId int, streamType StreamType, content []byte) error {
-	frame := base.InterleavedFrame{
-		TrackId:    trackId,
-		StreamType: streamType,
-		Content:    content,
-	}
-
-	c.nconn.SetWriteDeadline(time.Now().Add(c.d.WriteTimeout))
-	return frame.Write(c.bw)
-}
-
-// WriteFrame writes a frame.
-// This can be used only after Record().
-func (c *ConnClient) WriteFrame(trackId int, streamType StreamType, content []byte) error {
-	return c.writeFrameFunc(trackId, streamType, content)
-}
-
 // Do writes a Request and reads a Response.
-// Interleaved frames sent before the response are ignored.
+// Interleaved frames received before the response are ignored.
 func (c *ConnClient) Do(req *base.Request) (*base.Response, error) {
 	if req.Header == nil {
 		req.Header = make(base.Header)
@@ -262,7 +252,7 @@ func (c *ConnClient) Do(req *base.Request) (*base.Response, error) {
 // Since this method is not implemented by every RTSP server, the function
 // does not fail if the returned code is StatusNotFound.
 func (c *ConnClient) Options(u *base.URL) (*base.Response, error) {
-	err := c.checkState(map[connClientState]struct{}{
+	_, err := c.checkState(map[connClientState]struct{}{
 		connClientStateInitial:   {},
 		connClientStatePrePlay:   {},
 		connClientStatePreRecord: {},
@@ -302,7 +292,7 @@ func (c *ConnClient) Options(u *base.URL) (*base.Response, error) {
 
 // Describe writes a DESCRIBE request and reads a Response.
 func (c *ConnClient) Describe(u *base.URL) (Tracks, *base.Response, error) {
-	err := c.checkState(map[connClientState]struct{}{
+	_, err := c.checkState(map[connClientState]struct{}{
 		connClientStateInitial:   {},
 		connClientStatePrePlay:   {},
 		connClientStatePreRecord: {},
@@ -400,7 +390,7 @@ func (c *ConnClient) urlForTrack(baseUrl *base.URL, mode headers.TransportMode,
 // if rtpPort and rtcpPort are zero, they are chosen automatically.
 func (c *ConnClient) Setup(u *base.URL, mode headers.TransportMode, proto base.StreamProtocol,
 	track *Track, rtpPort int, rtcpPort int) (*base.Response, error) {
-	err := c.checkState(map[connClientState]struct{}{
+	s, err := c.checkState(map[connClientState]struct{}{
 		connClientStateInitial:   {},
 		connClientStatePrePlay:   {},
 		connClientStatePreRecord: {},
@@ -409,12 +399,12 @@ func (c *ConnClient) Setup(u *base.URL, mode headers.TransportMode, proto base.S
 		return nil, err
 	}
 
-	if mode == headers.TransportModeRecord && c.state != connClientStatePreRecord {
+	if mode == headers.TransportModeRecord && s != connClientStatePreRecord {
 		return nil, fmt.Errorf("cannot read and publish at the same time")
 	}
 
-	if mode == headers.TransportModePlay && c.state != connClientStatePrePlay &&
+	if mode == headers.TransportModePlay && s != connClientStatePrePlay &&
-		c.state != connClientStateInitial {
+		s != connClientStateInitial {
 		return nil, fmt.Errorf("cannot read and publish at the same time")
 	}
 
@@ -451,12 +441,12 @@ func (c *ConnClient) Setup(u *base.URL, mode headers.TransportMode, proto base.S
 		var err error
 		rtpListener, rtcpListener, err = func() (*connClientUDPListener, *connClientUDPListener, error) {
 			if rtpPort != 0 {
-				rtpListener, err := newConnClientUDPListener(c.d, rtpPort)
+				rtpListener, err := newConnClientUDPListener(c, rtpPort)
 				if err != nil {
 					return nil, nil, err
 				}
 
-				rtcpListener, err := newConnClientUDPListener(c.d, rtcpPort)
+				rtcpListener, err := newConnClientUDPListener(c, rtcpPort)
 				if err != nil {
 					rtpListener.close()
 					return nil, nil, err
@@ -471,12 +461,12 @@ func (c *ConnClient) Setup(u *base.URL, mode headers.TransportMode, proto base.S
 					rtpPort = (rand.Intn((65535-10000)/2) * 2) + 10000
 					rtcpPort = rtpPort + 1
 
-					rtpListener, err := newConnClientUDPListener(c.d, rtpPort)
+					rtpListener, err := newConnClientUDPListener(c, rtpPort)
 					if err != nil {
 						continue
 					}
 
-					rtcpListener, err := newConnClientUDPListener(c.d, rtcpPort)
+					rtcpListener, err := newConnClientUDPListener(c, rtcpPort)
 					if err != nil {
 						rtpListener.close()
 						continue
@@ -545,8 +535,7 @@ func (c *ConnClient) Setup(u *base.URL, mode headers.TransportMode, proto base.S
 	}
 
 	c.streamUrl = u
-	streamProtocol := proto
+	c.streamProtocol = &proto
-	c.streamProtocol = &streamProtocol
 
 	c.tracks = append(c.tracks, track)
 
@@ -563,241 +552,31 @@ func (c *ConnClient) Setup(u *base.URL, mode headers.TransportMode, proto base.S
 		rtpListener.remoteIp = c.nconn.RemoteAddr().(*net.TCPAddr).IP
 		rtpListener.remoteZone = c.nconn.RemoteAddr().(*net.TCPAddr).Zone
 		rtpListener.remotePort = (*th.ServerPorts)[0]
+		rtpListener.trackId = track.Id
+		rtpListener.streamType = StreamTypeRtp
 		c.udpRtpListeners[track.Id] = rtpListener
 
 		rtcpListener.remoteIp = c.nconn.RemoteAddr().(*net.TCPAddr).IP
 		rtcpListener.remoteZone = c.nconn.RemoteAddr().(*net.TCPAddr).Zone
 		rtcpListener.remotePort = (*th.ServerPorts)[1]
+		rtcpListener.trackId = track.Id
+		rtcpListener.streamType = StreamTypeRtcp
 		c.udpRtcpListeners[track.Id] = rtcpListener
 	}
 
 	if mode == headers.TransportModePlay {
-		c.state = connClientStatePrePlay
+		*c.state = connClientStatePrePlay
 	} else {
-		c.state = connClientStatePreRecord
+		*c.state = connClientStatePreRecord
 	}
 
 	return res, nil
 }
 
-// Play writes a PLAY request and reads a Response.
-// This can be called only after Setup().
-func (c *ConnClient) Play() (*base.Response, error) {
-	err := c.checkState(map[connClientState]struct{}{
-		connClientStatePrePlay: {},
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	res, err := c.Do(&base.Request{
-		Method: base.PLAY,
-		URL:    c.streamUrl,
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	if res.StatusCode != base.StatusOK {
-		return nil, fmt.Errorf("bad status code: %d (%s)", res.StatusCode, res.StatusMessage)
-	}
-
-	if *c.streamProtocol == StreamProtocolUDP {
-		c.writeFrameFunc = c.writeFrameUDP
-	} else {
-		c.writeFrameFunc = c.writeFrameTCP
-	}
-
-	c.state = connClientStatePlay
-
-	// open the firewall by sending packets to the counterpart
-	if *c.streamProtocol == StreamProtocolUDP {
-		for trackId := range c.udpRtpListeners {
-			c.WriteFrame(trackId, StreamTypeRtp,
-				[]byte{0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
-
-			c.WriteFrame(trackId, StreamTypeRtcp,
-				[]byte{0x80, 0xc9, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00})
-		}
-	}
-
-	c.reportWriterTerminate = make(chan struct{})
-	c.reportWriterDone = make(chan struct{})
-
-	go func() {
-		defer close(c.reportWriterDone)
-
-		reportWriterTicker := time.NewTicker(clientReceiverReportPeriod)
-		defer reportWriterTicker.Stop()
-
-		for {
-			select {
-			case <-c.reportWriterTerminate:
-				return
-
-			case <-reportWriterTicker.C:
-				for trackId := range c.rtcpReceivers {
-					frame := c.rtcpReceivers[trackId].Report()
-					c.WriteFrame(trackId, StreamTypeRtcp, frame)
-				}
-			}
-		}
-	}()
-
-	return res, nil
-}
-
-// Announce writes an ANNOUNCE request and reads a Response.
-func (c *ConnClient) Announce(u *base.URL, tracks Tracks) (*base.Response, error) {
-	err := c.checkState(map[connClientState]struct{}{
-		connClientStateInitial: {},
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	res, err := c.Do(&base.Request{
-		Method: base.ANNOUNCE,
-		URL:    u,
-		Header: base.Header{
-			"Content-Type": base.HeaderValue{"application/sdp"},
-		},
-		Content: tracks.Write(),
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	if res.StatusCode != base.StatusOK {
-		return nil, fmt.Errorf("bad status code: %d (%s)", res.StatusCode, res.StatusMessage)
-	}
-
-	c.streamUrl = u
-	c.state = connClientStatePreRecord
-
-	return res, nil
-}
-
-// Record writes a RECORD request and reads a Response.
-// This can be called only after Announce() and Setup().
-func (c *ConnClient) Record() (*base.Response, error) {
-	err := c.checkState(map[connClientState]struct{}{
-		connClientStatePreRecord: {},
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	res, err := c.Do(&base.Request{
-		Method: base.RECORD,
-		URL:    c.streamUrl,
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	if res.StatusCode != base.StatusOK {
-		return nil, fmt.Errorf("bad status code: %d (%s)", res.StatusCode, res.StatusMessage)
-	}
-
-	if *c.streamProtocol == StreamProtocolUDP {
-		c.writeFrameFunc = c.writeFrameUDP
-	} else {
-		c.writeFrameFunc = c.writeFrameTCP
-	}
-
-	c.state = connClientStateRecord
-
-	return nil, nil
-}
-
-// LoopUDP must be called after Play() or Record(); it keeps
-// the TCP connection open with keepalives, and returns when the TCP
-// connection closes.
-func (c *ConnClient) LoopUDP() error {
-	err := c.checkState(map[connClientState]struct{}{
-		connClientStatePlay:   {},
-		connClientStateRecord: {},
-	})
-	if err != nil {
-		return err
-	}
-
-	if *c.streamProtocol != StreamProtocolUDP {
-		return fmt.Errorf("stream protocol is not UDP")
-	}
-
-	if c.state == connClientStatePlay {
-		readDone := make(chan error)
-		go func() {
-			for {
-				c.nconn.SetReadDeadline(time.Now().Add(clientUDPKeepalivePeriod + c.d.ReadTimeout))
-				var res base.Response
-				err := res.Read(c.br)
-				if err != nil {
-					readDone <- err
-					return
-				}
-			}
-		}()
-
-		keepaliveTicker := time.NewTicker(clientUDPKeepalivePeriod)
-		defer keepaliveTicker.Stop()
-
-		checkStreamTicker := time.NewTicker(clientUDPCheckStreamPeriod)
-		defer checkStreamTicker.Stop()
-
-		for {
-			select {
-			case err := <-readDone:
-				c.nconn.Close()
-				return err
-
-			case <-keepaliveTicker.C:
-				_, err := c.Do(&base.Request{
-					Method: func() base.Method {
-						// the vlc integrated rtsp server requires GET_PARAMETER
-						if c.getParameterSupported {
-							return base.GET_PARAMETER
-						}
-						return base.OPTIONS
-					}(),
-					// use the stream path, otherwise some cameras do not reply
-					URL:          c.streamUrl,
-					SkipResponse: true,
-				})
-				if err != nil {
-					c.nconn.Close()
-					<-readDone
-					return err
-				}
-
-			case <-checkStreamTicker.C:
-				now := time.Now()
-
-				for _, lastUnix := range c.udpLastFrameTimes {
-					last := time.Unix(atomic.LoadInt64(lastUnix), 0)
-
-					if now.Sub(last) >= c.d.ReadTimeout {
-						c.nconn.Close()
-						<-readDone
-						return fmt.Errorf("no packets received recently (maybe there's a firewall/NAT in between)")
-					}
-				}
-			}
-		}
-	}
-
-	// connClientStateRecord
-	c.nconn.SetReadDeadline(time.Time{}) // disable deadline
-	var res base.Response
-	return res.Read(c.br)
-}
-
 // Pause writes a PAUSE request and reads a Response.
 // This can be called only after Play() or Record().
 func (c *ConnClient) Pause() (*base.Response, error) {
-	err := c.checkState(map[connClientState]struct{}{
+	s, err := c.checkState(map[connClientState]struct{}{
 		connClientStatePlay:   {},
 		connClientStateRecord: {},
 	})
@@ -805,9 +584,24 @@ func (c *ConnClient) Pause() (*base.Response, error) {
 		return nil, err
 	}
 
-	if c.state == connClientStatePlay {
+	close(c.backgroundTerminate)
-		close(c.reportWriterTerminate)
+	<-c.backgroundDone
-		<-c.reportWriterDone
+
+	if s == connClientStatePlay {
+		if *c.streamProtocol == StreamProtocolUDP {
+			ch := c.udpFrame
+			go func() {
+				for range ch {
+				}
+			}()
+
+			for trackId := range c.udpRtpListeners {
+				c.udpRtpListeners[trackId].stop()
+				c.udpRtcpListeners[trackId].stop()
+			}
+
+			close(ch)
+		}
 	}
 
 	res, err := c.Do(&base.Request{
@@ -822,10 +616,11 @@ func (c *ConnClient) Pause() (*base.Response, error) {
 		return nil, fmt.Errorf("bad status code: %d (%s)", res.StatusCode, res.StatusMessage)
 	}
 
-	if c.state == connClientStatePlay {
+	switch s {
-		c.state = connClientStatePrePlay
+	case connClientStatePlay:
-	} else {
+		c.state.store(connClientStatePrePlay)
-		c.state = connClientStatePreRecord
+	case connClientStateRecord:
+		c.state.store(connClientStatePreRecord)
 	}
 
 	return res, nil

connclientpublish.go

@@ -0,0 +1,154 @@
+package gortsplib
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/aler9/gortsplib/base"
+)
+
+// Announce writes an ANNOUNCE request and reads a Response.
+func (c *ConnClient) Announce(u *base.URL, tracks Tracks) (*base.Response, error) {
+	_, err := c.checkState(map[connClientState]struct{}{
+		connClientStateInitial: {},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := c.Do(&base.Request{
+		Method: base.ANNOUNCE,
+		URL:    u,
+		Header: base.Header{
+			"Content-Type": base.HeaderValue{"application/sdp"},
+		},
+		Content: tracks.Write(),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if res.StatusCode != base.StatusOK {
+		return nil, fmt.Errorf("bad status code: %d (%s)", res.StatusCode, res.StatusMessage)
+	}
+
+	c.streamUrl = u
+	*c.state = connClientStatePreRecord
+
+	return res, nil
+}
+
+// Record writes a RECORD request and reads a Response.
+// This can be called only after Announce() and Setup().
+func (c *ConnClient) Record() (*base.Response, error) {
+	_, err := c.checkState(map[connClientState]struct{}{
+		connClientStatePreRecord: {},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := c.Do(&base.Request{
+		Method: base.RECORD,
+		URL:    c.streamUrl,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if res.StatusCode != base.StatusOK {
+		return nil, fmt.Errorf("bad status code: %d (%s)", res.StatusCode, res.StatusMessage)
+	}
+
+	if *c.streamProtocol == StreamProtocolUDP {
+		c.writeFrameFunc = c.writeFrameUDP
+	} else {
+		c.writeFrameFunc = c.writeFrameTCP
+	}
+
+	c.state.store(connClientStateRecord)
+
+	c.backgroundTerminate = make(chan struct{})
+	c.backgroundDone = make(chan struct{})
+
+	if *c.streamProtocol == StreamProtocolUDP {
+		go c.backgroundRecordUDP()
+	} else {
+		go c.backgroundRecordTCP()
+	}
+
+	return nil, nil
+}
+
+func (c *ConnClient) backgroundRecordUDP() {
+	defer close(c.backgroundDone)
+
+	c.nconn.SetReadDeadline(time.Time{}) // disable deadline
+
+	readDone := make(chan error)
+	go func() {
+		for {
+			var res base.Response
+			err := res.Read(c.br)
+			if err != nil {
+				readDone <- err
+				return
+			}
+		}
+	}()
+
+	select {
+	case <-c.backgroundTerminate:
+		c.nconn.SetReadDeadline(time.Now())
+		<-readDone
+		c.backgroundUDPError = fmt.Errorf("terminated")
+		c.state.store(connClientStateUDPError)
+		return
+
+	case err := <-readDone:
+		c.backgroundUDPError = err
+		c.state.store(connClientStateUDPError)
+		return
+	}
+}
+
+func (c *ConnClient) backgroundRecordTCP() {
+	defer close(c.backgroundDone)
+}
+
+func (c *ConnClient) writeFrameUDP(trackId int, streamType StreamType, content []byte) error {
+	switch c.state.load() {
+	case connClientStateUDPError:
+		return c.backgroundUDPError
+
+	case connClientStateRecord:
+
+	default:
+		return fmt.Errorf("not recording")
+	}
+
+	if streamType == StreamTypeRtp {
+		return c.udpRtpListeners[trackId].write(content)
+	}
+	return c.udpRtcpListeners[trackId].write(content)
+}
+
+func (c *ConnClient) writeFrameTCP(trackId int, streamType StreamType, content []byte) error {
+	if c.state.load() != connClientStateRecord {
+		return fmt.Errorf("not recording")
+	}
+
+	c.nconn.SetWriteDeadline(time.Now().Add(c.d.WriteTimeout))
+	frame := base.InterleavedFrame{
+		TrackId:    trackId,
+		StreamType: streamType,
+		Content:    content,
+	}
+	return frame.Write(c.bw)
+}
+
+// WriteFrame writes a frame.
+// This can be used only after Record().
+func (c *ConnClient) WriteFrame(trackId int, streamType StreamType, content []byte) error {
+	return c.writeFrameFunc(trackId, streamType, content)
+}

connclientread.go

@@ -0,0 +1,201 @@
+package gortsplib
+
+import (
+	"fmt"
+	"sync/atomic"
+	"time"
+
+	"github.com/aler9/gortsplib/base"
+)
+
+// Play writes a PLAY request and reads a Response.
+// This can be called only after Setup().
+func (c *ConnClient) Play() (*base.Response, error) {
+	_, err := c.checkState(map[connClientState]struct{}{
+		connClientStatePrePlay: {},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := c.Do(&base.Request{
+		Method: base.PLAY,
+		URL:    c.streamUrl,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	if res.StatusCode != base.StatusOK {
+		return nil, fmt.Errorf("bad status code: %d (%s)", res.StatusCode, res.StatusMessage)
+	}
+
+	if *c.streamProtocol == StreamProtocolUDP {
+		c.readFrameFunc = c.readFrameUDP
+		c.writeFrameFunc = c.writeFrameUDP
+	} else {
+		c.readFrameFunc = c.readFrameTCP
+		c.writeFrameFunc = c.writeFrameTCP
+	}
+
+	c.state.store(connClientStatePlay)
+
+	c.backgroundTerminate = make(chan struct{})
+	c.backgroundDone = make(chan struct{})
+
+	if *c.streamProtocol == StreamProtocolUDP {
+		c.udpFrame = make(chan base.InterleavedFrame)
+
+		for trackId := range c.udpRtpListeners {
+			c.udpRtpListeners[trackId].start()
+			c.udpRtcpListeners[trackId].start()
+		}
+
+		// open the firewall by sending packets to the counterpart
+		for trackId := range c.udpRtpListeners {
+			c.WriteFrame(trackId, StreamTypeRtp,
+				[]byte{0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
+
+			c.WriteFrame(trackId, StreamTypeRtcp,
+				[]byte{0x80, 0xc9, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00})
+		}
+
+		go c.backgroundPlayUDP()
+	} else {
+		go c.backgroundPlayTCP()
+	}
+
+	return res, nil
+}
+
+func (c *ConnClient) backgroundPlayUDP() {
+	defer close(c.backgroundDone)
+
+	c.nconn.SetReadDeadline(time.Time{}) // disable deadline
+
+	readDone := make(chan error)
+	go func() {
+		for {
+			var res base.Response
+			err := res.Read(c.br)
+			if err != nil {
+				readDone <- err
+				return
+			}
+		}
+	}()
+
+	reportTicker := time.NewTicker(clientReceiverReportPeriod)
+	defer reportTicker.Stop()
+
+	keepaliveTicker := time.NewTicker(clientUDPKeepalivePeriod)
+	defer keepaliveTicker.Stop()
+
+	checkStreamTicker := time.NewTicker(clientUDPCheckStreamPeriod)
+	defer checkStreamTicker.Stop()
+
+	for {
+		select {
+		case <-c.backgroundTerminate:
+			c.nconn.SetReadDeadline(time.Now())
+			<-readDone
+			c.backgroundUDPError = fmt.Errorf("terminated")
+			c.state.store(connClientStateUDPError)
+			return
+
+		case <-reportTicker.C:
+			for trackId := range c.rtcpReceivers {
+				frame := c.rtcpReceivers[trackId].Report()
+				c.WriteFrame(trackId, StreamTypeRtcp, frame)
+			}
+
+		case <-keepaliveTicker.C:
+			_, err := c.Do(&base.Request{
+				Method: func() base.Method {
+					// the vlc integrated rtsp server requires GET_PARAMETER
+					if c.getParameterSupported {
+						return base.GET_PARAMETER
+					}
+					return base.OPTIONS
+				}(),
+				// use the stream path, otherwise some cameras do not reply
+				URL:          c.streamUrl,
+				SkipResponse: true,
+			})
+			if err != nil {
+				c.nconn.SetReadDeadline(time.Now())
+				<-readDone
+				c.backgroundUDPError = err
+				c.state.store(connClientStateUDPError)
+				return
+			}
+
+		case <-checkStreamTicker.C:
+			now := time.Now()
+
+			for _, lastUnix := range c.udpLastFrameTimes {
+				last := time.Unix(atomic.LoadInt64(lastUnix), 0)
+
+				if now.Sub(last) >= c.d.ReadTimeout {
+					c.nconn.SetReadDeadline(time.Now())
+					<-readDone
+					c.backgroundUDPError = fmt.Errorf("no packets received recently (maybe there's a firewall/NAT in between)")
+					c.state.store(connClientStateUDPError)
+					return
+				}
+			}
+		}
+	}
+}
+
+func (c *ConnClient) backgroundPlayTCP() {
+	defer close(c.backgroundDone)
+
+	reportTicker := time.NewTicker(clientReceiverReportPeriod)
+	defer reportTicker.Stop()
+
+	for {
+		select {
+		case <-c.backgroundTerminate:
+			return
+
+		case <-reportTicker.C:
+			for trackId := range c.rtcpReceivers {
+				frame := c.rtcpReceivers[trackId].Report()
+				c.WriteFrame(trackId, StreamTypeRtcp, frame)
+			}
+		}
+	}
+}
+
+func (c *ConnClient) readFrameUDP() (int, StreamType, []byte, error) {
+	if c.state.load() != connClientStatePlay {
+		return 0, 0, nil, fmt.Errorf("not playing")
+	}
+
+	f := <-c.udpFrame
+	return f.TrackId, f.StreamType, f.Content, nil
+}
+
+func (c *ConnClient) readFrameTCP() (int, StreamType, []byte, error) {
+	if c.state.load() != connClientStatePlay {
+		return 0, 0, nil, fmt.Errorf("not playing")
+	}
+
+	c.nconn.SetReadDeadline(time.Now().Add(c.d.ReadTimeout))
+	c.frame.Content = c.tcpFrameBuffer.Next()
+	err := c.frame.Read(c.br)
+	if err != nil {
+		return 0, 0, nil, err
+	}
+
+	c.rtcpReceivers[c.frame.TrackId].OnFrame(c.frame.StreamType, c.frame.Content)
+
+	return c.frame.TrackId, c.frame.StreamType, c.frame.Content, nil
+}
+
+// ReadFrame reads a frame.
+// This can be used only after Play().
+func (c *ConnClient) ReadFrame() (int, StreamType, []byte, error) {
+	return c.readFrameFunc()
+}

connclientudpl.go

@@ -3,40 +3,67 @@ package gortsplib
 import (
 	"net"
 	"strconv"
+	"sync/atomic"
+	"time"
 
+	"github.com/aler9/gortsplib/base"
 	"github.com/aler9/gortsplib/multibuffer"
 )
 
 type connClientUDPListener struct {
+	c              *ConnClient
 	pc             net.PacketConn
 	remoteIp       net.IP
 	remoteZone     string
 	remotePort     int
 	udpFrameBuffer *multibuffer.MultiBuffer
+	trackId        int
+	streamType     StreamType
+	running        bool
+
+	done chan struct{}
 }
 
-func newConnClientUDPListener(d Dialer, port int) (*connClientUDPListener, error) {
+func newConnClientUDPListener(c *ConnClient, port int) (*connClientUDPListener, error) {
-	pc, err := d.ListenPacket("udp", ":"+strconv.FormatInt(int64(port), 10))
+	pc, err := c.d.ListenPacket("udp", ":"+strconv.FormatInt(int64(port), 10))
 	if err != nil {
 		return nil, err
 	}
 
 	return &connClientUDPListener{
+		c:              c,
 		pc:             pc,
-		udpFrameBuffer: multibuffer.New(d.ReadBufferCount, 2048),
+		udpFrameBuffer: multibuffer.New(c.d.ReadBufferCount+1, 2048),
 	}, nil
 }
 
 func (l *connClientUDPListener) close() {
+	if l.running {
+		l.stop()
+	}
 	l.pc.Close()
 }
 
-func (l *connClientUDPListener) read() ([]byte, error) {
+func (l *connClientUDPListener) start() {
+	l.running = true
+	l.pc.SetReadDeadline(time.Time{})
+	l.done = make(chan struct{})
+	go l.run()
+}
+
+func (l *connClientUDPListener) stop() {
+	l.pc.SetReadDeadline(time.Now())
+	<-l.done
+}
+
+func (l *connClientUDPListener) run() {
+	defer close(l.done)
+
 	for {
 		buf := l.udpFrameBuffer.Next()
 		n, addr, err := l.pc.ReadFrom(buf)
 		if err != nil {
-			return nil, err
+			return
 		}
 
 		uaddr := addr.(*net.UDPAddr)
@@ -45,7 +72,15 @@ func (l *connClientUDPListener) read() ([]byte, error) {
 			continue
 		}
 
-		return buf[:n], nil
+		atomic.StoreInt64(l.c.udpLastFrameTimes[l.trackId], time.Now().Unix())
+
+		l.c.rtcpReceivers[l.trackId].OnFrame(l.streamType, buf[:n])
+
+		l.c.udpFrame <- base.InterleavedFrame{
+			TrackId:    l.trackId,
+			StreamType: l.streamType,
+			Content:    buf[:n],
+		}
 	}
 }
 

connserver.go

@@ -20,11 +20,11 @@ type ConnServerConf struct {
 	Conn net.Conn
 
 	// (optional) timeout of read operations.
-	// It defaults to 5 seconds
+	// It defaults to 10 seconds
 	ReadTimeout time.Duration
 
 	// (optional) timeout of write operations.
-	// It defaults to 5 seconds
+	// It defaults to 10 seconds
 	WriteTimeout time.Duration
 
 	// (optional) read buffer count.

dialer.go

@@ -2,6 +2,7 @@ package gortsplib
 
 import (
 	"bufio"
+	"fmt"
 	"net"
 	"strings"
 	"time"
@@ -21,23 +22,27 @@ func Dial(host string) (*ConnClient, error) {
 }
 
 // DialRead connects to a server and starts reading all tracks.
-func DialRead(address string, proto StreamProtocol) (*ConnClient, error) {
+func DialRead(address string) (*ConnClient, error) {
-	return DefaultDialer.DialRead(address, proto)
+	return DefaultDialer.DialRead(address)
 }
 
 // DialPublish connects to a server and starts publishing the tracks.
-func DialPublish(address string, proto StreamProtocol, tracks Tracks) (*ConnClient, error) {
+func DialPublish(address string, tracks Tracks) (*ConnClient, error) {
-	return DefaultDialer.DialPublish(address, proto, tracks)
+	return DefaultDialer.DialPublish(address, tracks)
 }
 
 // Dialer allows to initialize a ConnClient.
 type Dialer struct {
+	// (optional) the stream protocol.
+	// It defaults to StreamProtocolUDP.
+	StreamProtocol StreamProtocol
+
 	// (optional) timeout of read operations.
 	// It defaults to 10 seconds
 	ReadTimeout time.Duration
 
 	// (optional) timeout of write operations.
-	// It defaults to 5 seconds
+	// It defaults to 10 seconds
 	WriteTimeout time.Duration
 
 	// (optional) read buffer count.
@@ -87,6 +92,10 @@ func (d Dialer) Dial(host string) (*ConnClient, error) {
 		nconn: nconn,
 		br:    bufio.NewReaderSize(nconn, clientReadBufferSize),
 		bw:    bufio.NewWriterSize(nconn, clientWriteBufferSize),
+		state: func() *connClientState {
+			v := connClientState(0)
+			return &v
+		}(),
 		rtcpReceivers:      make(map[int]*rtcpreceiver.RtcpReceiver),
 		udpLastFrameTimes:  make(map[int]*int64),
 		udpRtpListeners:    make(map[int]*connClientUDPListener),
@@ -94,11 +103,12 @@ func (d Dialer) Dial(host string) (*ConnClient, error) {
 		response:           &base.Response{},
 		frame:              &base.InterleavedFrame{},
 		tcpFrameBuffer:     multibuffer.New(d.ReadBufferCount, clientTCPFrameReadBufferSize),
+		backgroundUDPError: fmt.Errorf("not running"),
 	}, nil
 }
 
 // DialRead connects to the address and starts reading all tracks.
-func (d Dialer) DialRead(address string, proto StreamProtocol) (*ConnClient, error) {
+func (d Dialer) DialRead(address string) (*ConnClient, error) {
 	u, err := base.ParseURL(address)
 	if err != nil {
 		return nil, err
@@ -124,11 +134,11 @@ func (d Dialer) DialRead(address string, proto StreamProtocol) (*ConnClient, err
 	if res.StatusCode >= base.StatusMovedPermanently &&
 		res.StatusCode <= base.StatusUseProxy {
 		conn.Close()
-		return d.DialRead(res.Header["Location"][0], proto)
+		return d.DialRead(res.Header["Location"][0])
 	}
 
 	for _, track := range tracks {
-		_, err := conn.Setup(u, headers.TransportModePlay, proto, track, 0, 0)
+		_, err := conn.Setup(u, headers.TransportModePlay, d.StreamProtocol, track, 0, 0)
 		if err != nil {
 			conn.Close()
 			return nil, err
@@ -145,7 +155,7 @@ func (d Dialer) DialRead(address string, proto StreamProtocol) (*ConnClient, err
 }
 
 // DialPublish connects to the address and starts publishing the tracks.
-func (d Dialer) DialPublish(address string, proto StreamProtocol, tracks Tracks) (*ConnClient, error) {
+func (d Dialer) DialPublish(address string, tracks Tracks) (*ConnClient, error) {
 	u, err := base.ParseURL(address)
 	if err != nil {
 		return nil, err
@@ -169,7 +179,7 @@ func (d Dialer) DialPublish(address string, proto StreamProtocol, tracks Tracks)
 	}
 
 	for _, track := range tracks {
-		_, err = conn.Setup(u, headers.TransportModeRecord, proto, track, 0, 0)
+		_, err = conn.Setup(u, headers.TransportModeRecord, d.StreamProtocol, track, 0, 0)
 		if err != nil {
 			conn.Close()
 			return nil, err

dialer_test.go

@@ -58,7 +58,12 @@ func (c *container) wait() int {
 	return int(code)
 }
 
-func TestDialReadUDP(t *testing.T) {
+func TestDialRead(t *testing.T) {
+	for _, proto := range []string{
+		"udp",
+		"tcp",
+	} {
+		t.Run(proto, func(t *testing.T) {
 			cnt1, err := newContainer("rtsp-simple-server", "server", []string{"{}"})
 			require.NoError(t, err)
 			defer cnt1.close()
@@ -79,52 +84,84 @@ func TestDialReadUDP(t *testing.T) {
 
 			time.Sleep(1 * time.Second)
 
-	loopDone := make(chan struct{})
+			dialer := func() Dialer {
-	defer func() { <-loopDone }()
+				if proto == "udp" {
-
+					return Dialer{}
-	conn, err := DialRead("rtsp://localhost:8554/teststream", StreamProtocolUDP)
+				}
-	require.NoError(t, err)
+				return Dialer{StreamProtocol: StreamProtocolTCP}
-	defer conn.Close()
-
-	go func() {
-		defer close(loopDone)
-		conn.LoopUDP()
 			}()
 
-	_, err = conn.ReadFrameUDP(0, StreamTypeRtp)
+			conn, err := dialer.DialRead("rtsp://localhost:8554/teststream")
 			require.NoError(t, err)
-}
 
-func TestDialReadTCP(t *testing.T) {
+			id, typ, _, err := conn.ReadFrame()
-	cnt1, err := newContainer("rtsp-simple-server", "server", []string{"{}"})
-	require.NoError(t, err)
-	defer cnt1.close()
-
-	time.Sleep(1 * time.Second)
-
-	cnt2, err := newContainer("ffmpeg", "publish", []string{
-		"-re",
-		"-stream_loop", "-1",
-		"-i", "/emptyvideo.ts",
-		"-c", "copy",
-		"-f", "rtsp",
-		"-rtsp_transport", "udp",
-		"rtsp://localhost:8554/teststream",
-	})
-	require.NoError(t, err)
-	defer cnt2.close()
-
-	time.Sleep(1 * time.Second)
-
-	conn, err := DialRead("rtsp://localhost:8554/teststream", StreamProtocolTCP)
-	require.NoError(t, err)
-	defer conn.Close()
-
-	id, typ, _, err := conn.ReadFrameTCP()
 			require.NoError(t, err)
 
 			require.Equal(t, 0, id)
 			require.Equal(t, StreamTypeRtp, typ)
+
+			conn.Close()
+
+			_, _, _, err = conn.ReadFrame()
+			require.Error(t, err)
+		})
+	}
+}
+
+func TestDialReadClose(t *testing.T) {
+	for _, proto := range []string{
+		"udp",
+		"tcp",
+	} {
+		t.Run(proto, func(t *testing.T) {
+			cnt1, err := newContainer("rtsp-simple-server", "server", []string{"{}"})
+			require.NoError(t, err)
+			defer cnt1.close()
+
+			time.Sleep(1 * time.Second)
+
+			cnt2, err := newContainer("ffmpeg", "publish", []string{
+				"-re",
+				"-stream_loop", "-1",
+				"-i", "/emptyvideo.ts",
+				"-c", "copy",
+				"-f", "rtsp",
+				"-rtsp_transport", "udp",
+				"rtsp://localhost:8554/teststream",
+			})
+			require.NoError(t, err)
+			defer cnt2.close()
+
+			time.Sleep(1 * time.Second)
+
+			dialer := func() Dialer {
+				if proto == "udp" {
+					return Dialer{}
+				}
+				return Dialer{StreamProtocol: StreamProtocolTCP}
+			}()
+
+			conn, err := dialer.DialRead("rtsp://localhost:8554/teststream")
+			require.NoError(t, err)
+
+			readDone := make(chan struct{})
+			go func() {
+				defer close(readDone)
+
+				for {
+					_, _, _, err := conn.ReadFrame()
+					if err != nil {
+						break
+					}
+				}
+			}()
+
+			time.Sleep(1 * time.Second)
+
+			conn.Close()
+			<-readDone
+		})
+	}
 }
 
 func TestDialReadRedirect(t *testing.T) {
@@ -154,29 +191,78 @@ func TestDialReadRedirect(t *testing.T) {
 
 	time.Sleep(1 * time.Second)
 
-	loopDone := make(chan struct{})
+	conn, err := DialRead("rtsp://localhost:8554/path1")
-	defer func() { <-loopDone }()
-
-	conn, err := DialRead("rtsp://localhost:8554/path1", StreamProtocolUDP)
 	require.NoError(t, err)
 	defer conn.Close()
 
-	go func() {
+	_, _, _, err = conn.ReadFrame()
-		defer close(loopDone)
-		conn.LoopUDP()
-	}()
-
-	_, err = conn.ReadFrameUDP(0, StreamTypeRtp)
 	require.NoError(t, err)
 }
 
-func TestDialPublishUDP(t *testing.T) {
+func TestDialReadPause(t *testing.T) {
-	for _, server := range []string{
+	for _, proto := range []string{
-		"rtsp-simple-server",
+		"udp",
-		"ffmpeg",
+		"tcp",
 	} {
-		t.Run(server, func(t *testing.T) {
+		t.Run(proto, func(t *testing.T) {
-			switch server {
+			cnt1, err := newContainer("rtsp-simple-server", "server", []string{"{}"})
+			require.NoError(t, err)
+			defer cnt1.close()
+
+			time.Sleep(1 * time.Second)
+
+			cnt2, err := newContainer("ffmpeg", "publish", []string{
+				"-re",
+				"-stream_loop", "-1",
+				"-i", "/emptyvideo.ts",
+				"-c", "copy",
+				"-f", "rtsp",
+				"-rtsp_transport", "udp",
+				"rtsp://localhost:8554/teststream",
+			})
+			require.NoError(t, err)
+			defer cnt2.close()
+
+			time.Sleep(1 * time.Second)
+
+			dialer := func() Dialer {
+				if proto == "udp" {
+					return Dialer{}
+				}
+				return Dialer{StreamProtocol: StreamProtocolTCP}
+			}()
+
+			conn, err := dialer.DialRead("rtsp://localhost:8554/teststream")
+			require.NoError(t, err)
+			defer conn.Close()
+
+			_, _, _, err = conn.ReadFrame()
+			require.NoError(t, err)
+
+			_, err = conn.Pause()
+			require.NoError(t, err)
+
+			_, err = conn.Play()
+			require.NoError(t, err)
+
+			_, _, _, err = conn.ReadFrame()
+			require.NoError(t, err)
+		})
+	}
+}
+
+func TestDialPublish(t *testing.T) {
+	for _, ca := range []struct {
+		proto  string
+		server string
+	}{
+		{"udp", "rtsp-simple-server"},
+		{"udp", "ffmpeg"},
+		{"tcp", "rtsp-simple-server"},
+		{"tcp", "ffmpeg"},
+	} {
+		t.Run(ca.proto+"_"+ca.server, func(t *testing.T) {
+			switch ca.server {
 			case "rtsp-simple-server":
 				cnt1, err := newContainer("rtsp-simple-server", "server", []string{"{}"})
 				require.NoError(t, err)
@@ -196,21 +282,6 @@ func TestDialPublishUDP(t *testing.T) {
 
 			time.Sleep(1 * time.Second)
 
-			publishDone := make(chan struct{})
-			defer func() { <-publishDone }()
-
-			var conn *ConnClient
-
-			go func() {
-				defer close(publishDone)
-
-				var writerDone chan struct{}
-				defer func() {
-					if writerDone != nil {
-						<-writerDone
-					}
-				}()
-
 			pc, err := net.ListenPacket("udp4", "127.0.0.1:0")
 			require.NoError(t, err)
 			defer pc.Close()
@@ -229,18 +300,30 @@ func TestDialPublishUDP(t *testing.T) {
 			track, err := NewTrackH264(0, sps, pps)
 			require.NoError(t, err)
 
-				port := "8554"
+			publishDone := make(chan struct{})
-				if server == "ffmpeg" {
+			defer func() { <-publishDone }()
-					port = "8555"
-				}
-				conn, err = DialPublish("rtsp://localhost:"+port+"/teststream",
-					StreamProtocolUDP, Tracks{track})
-				require.NoError(t, err)
 
-				writerDone = make(chan struct{})
+			var conn *ConnClient
+			defer func() { conn.Close() }()
+
+			dialer := func() Dialer {
+				if ca.proto == "udp" {
+					return Dialer{}
+				}
+				return Dialer{StreamProtocol: StreamProtocolTCP}
+			}()
 
 			go func() {
-					defer close(writerDone)
+				defer close(publishDone)
+
+				port := "8554"
+				if ca.server == "ffmpeg" {
+					port = "8555"
+				}
+				var err error
+				conn, err = dialer.DialPublish("rtsp://localhost:"+port+"/teststream",
+					Tracks{track})
+				require.NoError(t, err)
 
 				buf := make([]byte, 2048)
 				for {
@@ -256,10 +339,7 @@ func TestDialPublishUDP(t *testing.T) {
 				}
 			}()
 
-				conn.LoopUDP()
+			if ca.server == "ffmpeg" {
-			}()
-
-			if server == "ffmpeg" {
 				time.Sleep(5 * time.Second)
 			}
 			time.Sleep(1 * time.Second)
@@ -276,46 +356,22 @@ func TestDialPublishUDP(t *testing.T) {
 
 			code := cnt3.wait()
 			require.Equal(t, 0, code)
-
-			conn.Close()
 		})
 	}
 }
 
-func TestDialPublishTCP(t *testing.T) {
+func TestDialPublishClose(t *testing.T) {
-	for _, server := range []string{
+	for _, proto := range []string{
-		"rtsp-simple-server",
+		"udp",
-		"ffmpeg",
+		"tcp",
 	} {
-		t.Run(server, func(t *testing.T) {
+		t.Run(proto, func(t *testing.T) {
-			switch server {
-			case "rtsp-simple-server":
 			cnt1, err := newContainer("rtsp-simple-server", "server", []string{"{}"})
 			require.NoError(t, err)
 			defer cnt1.close()
 
-			default:
-				cnt0, err := newContainer("rtsp-simple-server", "server0", []string{"{}"})
-				require.NoError(t, err)
-				defer cnt0.close()
-
-				cnt1, err := newContainer("ffmpeg", "server", []string{
-					"-fflags nobuffer -re -rtsp_flags listen -i rtsp://localhost:8555/teststream -c copy -f rtsp rtsp://localhost:8554/teststream",
-				})
-				require.NoError(t, err)
-				defer cnt1.close()
-			}
-
 			time.Sleep(1 * time.Second)
 
-			publishDone := make(chan struct{})
-			defer func() { <-publishDone }()
-
-			var conn *ConnClient
-
-			go func() {
-				defer close(publishDone)
-
 			pc, err := net.ListenPacket("udp4", "127.0.0.1:0")
 			require.NoError(t, err)
 			defer pc.Close()
@@ -334,20 +390,25 @@ func TestDialPublishTCP(t *testing.T) {
 			track, err := NewTrackH264(0, sps, pps)
 			require.NoError(t, err)
 
-				port := "8554"
+			dialer := func() Dialer {
-				if server == "ffmpeg" {
+				if proto == "udp" {
-					port = "8555"
+					return Dialer{}
 				}
-				conn, err = DialPublish("rtsp://localhost:"+port+"/teststream",
+				return Dialer{StreamProtocol: StreamProtocolTCP}
-					StreamProtocolTCP, Tracks{track})
+			}()
+
+			conn, err := dialer.DialPublish("rtsp://localhost:8554/teststream",
+				Tracks{track})
 			require.NoError(t, err)
 
+			writeDone := make(chan struct{})
+			go func() {
+				defer close(writeDone)
+
 				buf := make([]byte, 2048)
 				for {
 					n, _, err := pc.ReadFrom(buf)
-					if err != nil {
+					require.NoError(t, err)
-						break
-					}
 
 					err = conn.WriteFrame(track.Id, StreamTypeRtp, buf[:n])
 					if err != nil {
@@ -356,25 +417,78 @@ func TestDialPublishTCP(t *testing.T) {
 				}
 			}()
 
-			if server == "ffmpeg" {
-				time.Sleep(5 * time.Second)
-			}
 			time.Sleep(1 * time.Second)
 
-			cnt3, err := newContainer("ffmpeg", "read", []string{
-				"-rtsp_transport", "udp",
-				"-i", "rtsp://localhost:8554/teststream",
-				"-vframes", "1",
-				"-f", "image2",
-				"-y", "/dev/null",
-			})
-			require.NoError(t, err)
-			defer cnt3.close()
-
-			code := cnt3.wait()
-			require.Equal(t, 0, code)
-
 			conn.Close()
+			<-writeDone
+		})
+	}
+}
+
+func TestDialPublishPause(t *testing.T) {
+	for _, proto := range []string{
+		"udp",
+		"tcp",
+	} {
+		t.Run(proto, func(t *testing.T) {
+			cnt1, err := newContainer("rtsp-simple-server", "server", []string{"{}"})
+			require.NoError(t, err)
+			defer cnt1.close()
+
+			time.Sleep(1 * time.Second)
+
+			pc, err := net.ListenPacket("udp4", "127.0.0.1:0")
+			require.NoError(t, err)
+			defer pc.Close()
+
+			cnt2, err := newContainer("gstreamer", "source", []string{
+				"filesrc location=emptyvideo.ts ! tsdemux ! video/x-h264" +
+					" ! h264parse config-interval=1 ! rtph264pay ! udpsink host=127.0.0.1 port=" + strconv.FormatInt(int64(pc.LocalAddr().(*net.UDPAddr).Port), 10),
+			})
+			require.NoError(t, err)
+			defer cnt2.close()
+
+			decoder := rtph264.NewDecoderFromPacketConn(pc)
+			sps, pps, err := decoder.ReadSPSPPS()
+			require.NoError(t, err)
+
+			track, err := NewTrackH264(0, sps, pps)
+			require.NoError(t, err)
+
+			dialer := func() Dialer {
+				if proto == "udp" {
+					return Dialer{}
+				}
+				return Dialer{StreamProtocol: StreamProtocolTCP}
+			}()
+
+			conn, err := dialer.DialPublish("rtsp://localhost:8554/teststream",
+				Tracks{track})
+			require.NoError(t, err)
+			defer conn.Close()
+
+			buf := make([]byte, 2048)
+
+			n, _, err := pc.ReadFrom(buf)
+			require.NoError(t, err)
+			err = conn.WriteFrame(track.Id, StreamTypeRtp, buf[:n])
+			require.NoError(t, err)
+
+			_, err = conn.Pause()
+			require.NoError(t, err)
+
+			n, _, err = pc.ReadFrom(buf)
+			require.NoError(t, err)
+			err = conn.WriteFrame(track.Id, StreamTypeRtp, buf[:n])
+			require.Error(t, err)
+
+			_, err = conn.Record()
+			require.NoError(t, err)
+
+			n, _, err = pc.ReadFrom(buf)
+			require.NoError(t, err)
+			err = conn.WriteFrame(track.Id, StreamTypeRtp, buf[:n])
+			require.NoError(t, err)
 		})
 	}
 }

examples/client-publish-tcp.go

@@ -41,8 +41,10 @@ func main() {
 	}
 
 	// connect to the server and start publishing the track
-	conn, err := gortsplib.DialPublish("rtsp://localhost:8554/mystream",
+	dialer := gortsplib.Dialer{
-		gortsplib.StreamProtocolTCP, gortsplib.Tracks{track})
+		StreamProtocol: gortsplib.StreamProtocolTCP,
+	}
+	conn, err := dialer.DialPublish("rtsp://localhost:8554/mystream", gortsplib.Tracks{track})
 	if err != nil {
 		panic(err)
 	}
@@ -59,7 +61,7 @@ func main() {
 		// write frames to the server
 		err = conn.WriteFrame(track.Id, gortsplib.StreamTypeRtp, buf[:n])
 		if err != nil {
-			fmt.Println("connection is closed (%s)", err)
+			fmt.Printf("connection is closed (%s)\n", err)
 			break
 		}
 	}

examples/client-publish-udp.go

@@ -15,13 +15,6 @@ import (
 // the frames with the UDP protocol.
 
 func main() {
-	var writerDone chan struct{}
-	defer func() {
-		if writerDone != nil {
-			<-writerDone
-		}
-	}()
-
 	// open a listener to receive RTP/H264 frames
 	pc, err := net.ListenPacket("udp4", "127.0.0.1:9000")
 	if err != nil {
@@ -49,17 +42,12 @@ func main() {
 
 	// connect to the server and start publishing the track
 	conn, err := gortsplib.DialPublish("rtsp://localhost:8554/mystream",
-		gortsplib.StreamProtocolUDP, gortsplib.Tracks{track})
+		gortsplib.Tracks{track})
 	if err != nil {
 		panic(err)
 	}
 	defer conn.Close()
 
-	writerDone = make(chan struct{})
-
-	go func() {
-		defer close(writerDone)
-
 	buf := make([]byte, 2048)
 	for {
 		// read frames from the source
@@ -71,12 +59,8 @@ func main() {
 		// write frames to the server
 		err = conn.WriteFrame(track.Id, gortsplib.StreamTypeRtp, buf[:n])
 		if err != nil {
+			fmt.Printf("connection is closed (%s)\n", err)
 			break
 		}
 	}
-	}()
-
-	// wait until the connection is closed
-	err = conn.LoopUDP()
-	fmt.Println("connection is closed (%s)", err)
 }

examples/client-query.go

@@ -0,0 +1,42 @@
+// +build ignore
+
+package main
+
+import (
+	"fmt"
+
+	"github.com/aler9/gortsplib"
+	"github.com/aler9/gortsplib/base"
+)
+
+// This example shows how to connect to a server and print informations about
+// tracks published on a certain path.
+
+func main() {
+	u, err := base.ParseURL("rtsp://myserver/mypath")
+	if err != nil {
+		panic(err)
+	}
+
+	conn, err := gortsplib.Dial(u.Host)
+	if err != nil {
+		panic(err)
+	}
+	defer conn.Close()
+
+	_, err = conn.Options(u)
+	if err != nil {
+		panic(err)
+	}
+
+	tracks, res, err := conn.Describe(u)
+	if err != nil {
+		panic(err)
+	}
+
+	if res.StatusCode != base.StatusOK {
+		panic(fmt.Errorf("server returned status %d", res.StatusCode))
+	}
+
+	fmt.Println("tracks: %v\n", tracks)
+}

examples/client-read-tcp.go

@@ -13,17 +13,20 @@ import (
 
 func main() {
 	// connect to the server and start reading all tracks
-	conn, err := gortsplib.DialRead("rtsp://localhost:8554/mystream", gortsplib.StreamProtocolTCP)
+	dialer := gortsplib.Dialer{
+		StreamProtocol: gortsplib.StreamProtocolTCP,
+	}
+	conn, err := dialer.DialRead("rtsp://localhost:8554/mystream")
 	if err != nil {
 		panic(err)
 	}
 	defer conn.Close()
 
-	for {
 	// read frames
-		id, typ, buf, err := conn.ReadFrameTCP()
+	for {
+		id, typ, buf, err := conn.ReadFrame()
 		if err != nil {
-			fmt.Println("connection is closed (%s)", err)
+			fmt.Printf("connection is closed (%s)\n", err)
 			break
 		}
 

examples/client-read-udp.go

@@ -4,7 +4,6 @@ package main
 
 import (
 	"fmt"
-	"sync"
 
 	"github.com/aler9/gortsplib"
 )
@@ -13,49 +12,22 @@ import (
 // read all tracks with the UDP protocol.
 
 func main() {
-	var wg sync.WaitGroup
-	defer wg.Wait()
-
 	// connect to the server and start reading all tracks
-	conn, err := gortsplib.DialRead("rtsp://localhost:8554/mystream", gortsplib.StreamProtocolUDP)
+	conn, err := gortsplib.DialRead("rtsp://localhost:8554/mystream")
 	if err != nil {
 		panic(err)
 	}
 	defer conn.Close()
 
-	for _, track := range conn.Tracks() {
+	// read frames
-		// read RTP frames
-		wg.Add(1)
-		go func(trackId int) {
-			defer wg.Done()
-
 	for {
-				buf, err := conn.ReadFrameUDP(trackId, gortsplib.StreamTypeRtp)
+		id, typ, buf, err := conn.ReadFrame()
 		if err != nil {
+			fmt.Printf("connection is closed (%s)\n", err)
 			break
 		}
 
-				fmt.Printf("frame from track %d, type RTP: %v\n", trackId, buf)
+		fmt.Printf("frame from track %d, type %v: %v\n",
+			id, typ, buf)
 	}
-		}(track.Id)
-
-		// read RTCP frames
-		wg.Add(1)
-		go func(trackId int) {
-			defer wg.Done()
-
-			for {
-				buf, err := conn.ReadFrameUDP(trackId, gortsplib.StreamTypeRtcp)
-				if err != nil {
-					break
-				}
-
-				fmt.Printf("frame from track %d, type RTCP: %v\n", trackId, buf)
-			}
-		}(track.Id)
-	}
-
-	// wait until the connection is closed
-	err = conn.LoopUDP()
-	fmt.Println("connection is closed (%s)", err)
 }