Fix missed control in SDP

pkg/core/media.go

@@ -82,6 +82,13 @@ func (m *Media) MatchAll() bool {
 	return false
 }
 
+func (m *Media) Equal(media *Media) bool {
+	if media.ID != "" {
+		return m.ID == media.ID
+	}
+	return m.String() == media.String()
+}
+
 func GetKind(name string) string {
 	switch name {
 	case CodecH264, CodecH265, CodecVP8, CodecVP9, CodecAV1, CodecJPEG:

pkg/rtsp/client.go

@@ -276,7 +276,7 @@ func (c *Conn) SetupMedia(media *core.Media, first bool) (byte, error) {
 
 	// try to use media position as channel number
 	for i, m := range c.Medias {
-		if m.ID == media.ID {
+		if m.Equal(media) {
 			transport = fmt.Sprintf(
 				// i   - RTP (data channel)
 				// i+1 - RTCP (control channel)
@@ -327,9 +327,9 @@ func (c *Conn) SetupMedia(media *core.Media, first bool) (byte, error) {
 				return 0, err
 			}
 
-			for _, newMedia := range c.Medias {
-				if newMedia.ID == media.ID {
-					return c.SetupMedia(newMedia, false)
+			for _, m := range c.Medias {
+				if m.Equal(media) {
+					return c.SetupMedia(m, false)
 				}
 			}
 		}

pkg/rtsp/client_test.go

@@ -0,0 +1,94 @@
+package rtsp
+
+import (
+	"github.com/stretchr/testify/require"
+	"net"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestTimeout(t *testing.T) {
+	Timeout = time.Millisecond
+
+	ln, err := net.Listen("tcp", "localhost:0")
+	require.Nil(t, err)
+
+	client := NewClient("rtsp://" + ln.Addr().String() + "/stream")
+	client.Backchannel = true
+
+	err = client.Dial()
+	require.Nil(t, err)
+
+	err = client.Describe()
+	require.ErrorIs(t, err, os.ErrDeadlineExceeded)
+}
+
+func TestMissedControl(t *testing.T) {
+	Timeout = time.Millisecond
+
+	ln, err := net.Listen("tcp", "localhost:0")
+	require.Nil(t, err)
+
+	go func() {
+		conn, err := ln.Accept()
+		require.Nil(t, err)
+
+		b := make([]byte, 8192)
+		for {
+			n, err := conn.Read(b)
+			require.Nil(t, err)
+
+			req := string(b[:n])
+
+			switch req[:4] {
+			case "DESC":
+				_, _ = conn.Write([]byte(`RTSP/1.0 200 OK
+Cseq: 1
+Content-Length: 495
+Content-Type: application/sdp
+
+v=0
+o=- 1 1 IN IP4 0.0.0.0
+s=go2rtc/1.2.0
+c=IN IP4 0.0.0.0
+t=0 0
+m=audio 0 RTP/AVP 96
+a=rtpmap:96 MPEG4-GENERIC/48000/2
+a=fmtp:96 profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3; config=119056E500
+m=audio 0 RTP/AVP 97
+a=rtpmap:97 OPUS/48000/2
+a=fmtp:97 sprop-stereo=1
+m=video 0 RTP/AVP 98
+a=rtpmap:98 H264/90000
+a=fmtp:98 packetization-mode=1; sprop-parameter-sets=Z2QAKaw0yAeAIn5cBagICAoAAAfQAAE4gdDAAjhAACOEF3lxoYAEcIAARwgu8uFA,aO48MAA=; profile-level-id=640029
+`))
+
+			case "SETU":
+				_, _ = conn.Write([]byte(`RTSP/1.0 200 OK
+Transport: RTP/AVP/TCP;unicast;interleaved=4-5
+Cseq: 3
+Session: 1
+
+`))
+
+			default:
+				t.Fail()
+			}
+		}
+	}()
+
+	client := NewClient("rtsp://" + ln.Addr().String() + "/stream")
+	client.Backchannel = true
+
+	err = client.Dial()
+	require.Nil(t, err)
+
+	err = client.Describe()
+	require.Nil(t, err)
+	require.Len(t, client.Medias, 3)
+
+	ch, err := client.SetupMedia(client.Medias[2], true)
+	require.Nil(t, err)
+	require.Equal(t, ch, byte(4))
+}