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conn.go
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conn.go
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package rtsp
import (
"bufio"
"crypto/tls"
"encoding/binary"
"errors"
"fmt"
"github.com/AlexxIT/go2rtc/pkg/aac"
"github.com/AlexxIT/go2rtc/pkg/h264"
"github.com/AlexxIT/go2rtc/pkg/mjpeg"
"github.com/AlexxIT/go2rtc/pkg/streamer"
"github.com/AlexxIT/go2rtc/pkg/tcp"
"github.com/pion/rtcp"
"github.com/pion/rtp"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
)
const (
ProtoRTSP = "RTSP/1.0"
MethodOptions = "OPTIONS"
MethodSetup = "SETUP"
MethodTeardown = "TEARDOWN"
MethodDescribe = "DESCRIBE"
MethodPlay = "PLAY"
MethodPause = "PAUSE"
MethodAnnounce = "ANNOUNCE"
MethodRecord = "RECORD"
)
type Mode byte
const (
ModeUnknown Mode = iota
ModeClientProducer
ModeServerUnknown
ModeServerProducer
ModeServerConsumer
)
type State byte
func (s State) String() string {
switch s {
case StateNone:
return "NONE"
case StateConn:
return "CONN"
case StateSetup:
return "SETUP"
case StatePlay:
return "PLAY"
case StateHandle:
return "HANDLE"
}
return strconv.Itoa(int(s))
}
const (
StateNone State = iota
StateConn
StateSetup
StatePlay
StateHandle
)
type Conn struct {
streamer.Element
// public
Backchannel bool
SessionName string
Medias []*streamer.Media
Session string
UserAgent string
URL *url.URL
// internal
auth *tcp.Auth
conn net.Conn
mode Mode
state State
stateMu sync.Mutex
reader *bufio.Reader
sequence int
uri string
tracks []*streamer.Track
channels map[byte]*streamer.Track
// stats
receive int
send int
}
func NewClient(uri string) (*Conn, error) {
c := new(Conn)
c.mode = ModeClientProducer
c.uri = uri
return c, c.parseURI()
}
func NewServer(conn net.Conn) *Conn {
c := new(Conn)
c.conn = conn
c.mode = ModeServerUnknown
c.reader = bufio.NewReader(conn)
return c
}
func (c *Conn) Auth(username, password string) {
info := url.UserPassword(username, password)
c.auth = tcp.NewAuth(info)
}
func (c *Conn) parseURI() (err error) {
c.URL, err = url.Parse(c.uri)
if err != nil {
return err
}
if strings.IndexByte(c.URL.Host, ':') < 0 {
c.URL.Host += ":554"
}
// remove UserInfo from URL
c.auth = tcp.NewAuth(c.URL.User)
c.URL.User = nil
return nil
}
func (c *Conn) Dial() (err error) {
if c.conn != nil {
_ = c.parseURI()
}
c.conn, err = net.DialTimeout("tcp", c.URL.Host, time.Second*5)
if err != nil {
return
}
var tlsConf *tls.Config
switch c.URL.Scheme {
case "rtsps":
tlsConf = &tls.Config{ServerName: c.URL.Hostname()}
case "rtspx":
c.URL.Scheme = "rtsps"
tlsConf = &tls.Config{InsecureSkipVerify: true}
}
if tlsConf != nil {
tlsConn := tls.Client(c.conn, tlsConf)
if err = tlsConn.Handshake(); err != nil {
return err
}
c.conn = tlsConn
}
c.reader = bufio.NewReader(c.conn)
c.state = StateConn
return nil
}
// Request sends only Request
func (c *Conn) Request(req *tcp.Request) error {
if req.Proto == "" {
req.Proto = ProtoRTSP
}
if req.Header == nil {
req.Header = make(map[string][]string)
}
c.sequence++
// important to send case sensitive CSeq
// https://github.com/AlexxIT/go2rtc/issues/7
req.Header["CSeq"] = []string{strconv.Itoa(c.sequence)}
c.auth.Write(req)
if c.Session != "" {
req.Header.Set("Session", c.Session)
}
if req.Body != nil {
val := strconv.Itoa(len(req.Body))
req.Header.Set("Content-Length", val)
}
c.Fire(req)
return req.Write(c.conn)
}
// Do send Request and receive and process Response
func (c *Conn) Do(req *tcp.Request) (*tcp.Response, error) {
if err := c.Request(req); err != nil {
return nil, err
}
res, err := tcp.ReadResponse(c.reader)
if err != nil {
return nil, err
}
c.Fire(res)
if res.StatusCode == http.StatusUnauthorized {
switch c.auth.Method {
case tcp.AuthNone:
return nil, errors.New("user/pass not provided")
case tcp.AuthUnknown:
if c.auth.Read(res) {
return c.Do(req)
}
case tcp.AuthBasic, tcp.AuthDigest:
return nil, errors.New("wrong user/pass")
}
}
if res.StatusCode != http.StatusOK {
return res, fmt.Errorf("wrong response on %s", req.Method)
}
return res, nil
}
func (c *Conn) Response(res *tcp.Response) error {
if res.Proto == "" {
res.Proto = ProtoRTSP
}
if res.Status == "" {
res.Status = "200 OK"
}
if res.Header == nil {
res.Header = make(map[string][]string)
}
if res.Request != nil && res.Request.Header != nil {
seq := res.Request.Header.Get("CSeq")
if seq != "" {
res.Header.Set("CSeq", seq)
}
}
if c.Session != "" {
res.Header.Set("Session", c.Session)
}
if res.Body != nil {
val := strconv.Itoa(len(res.Body))
res.Header.Set("Content-Length", val)
}
c.Fire(res)
return res.Write(c.conn)
}
func (c *Conn) Options() error {
req := &tcp.Request{Method: MethodOptions, URL: c.URL}
res, err := c.Do(req)
if err != nil {
return err
}
if val := res.Header.Get("Content-Base"); val != "" {
c.URL, err = urlParse(val)
if err != nil {
return err
}
}
return nil
}
func (c *Conn) Describe() error {
// 5.3 Back channel connection
// https://www.onvif.org/specs/stream/ONVIF-Streaming-Spec.pdf
req := &tcp.Request{
Method: MethodDescribe,
URL: c.URL,
Header: map[string][]string{
"Accept": {"application/sdp"},
},
}
if c.Backchannel {
req.Header.Set("Require", "www.onvif.org/ver20/backchannel")
}
res, err := c.Do(req)
if err != nil {
return err
}
if val := res.Header.Get("Content-Base"); val != "" {
c.URL, err = urlParse(val)
if err != nil {
return err
}
}
c.Medias, err = UnmarshalSDP(res.Body)
if err != nil {
return err
}
c.mode = ModeClientProducer
return nil
}
//func (c *Conn) Announce() (err error) {
// req := &tcp.Request{
// Method: MethodAnnounce,
// URL: c.URL,
// Header: map[string][]string{
// "Content-Type": {"application/sdp"},
// },
// }
//
// //req.Body, err = c.sdp.Marshal()
// if err != nil {
// return
// }
//
// _, err = c.Do(req)
//
// return
//}
func (c *Conn) Setup() error {
for _, media := range c.Medias {
_, err := c.SetupMedia(media, media.Codecs[0], true)
if err != nil {
return err
}
}
return nil
}
func (c *Conn) SetupMedia(media *streamer.Media, codec *streamer.Codec, first bool) (*streamer.Track, error) {
// TODO: rewrite recoonection and first flag
if first {
c.stateMu.Lock()
defer c.stateMu.Unlock()
}
if c.state != StateConn && c.state != StateSetup {
return nil, fmt.Errorf("RTSP SETUP from wrong state: %s", c.state)
}
ch := c.GetChannel(media)
if ch < 0 {
return nil, fmt.Errorf("wrong media: %v", media)
}
rawURL := media.Control
if !strings.Contains(rawURL, "://") {
rawURL = c.URL.String()
if !strings.HasSuffix(rawURL, "/") {
rawURL += "/"
}
rawURL += media.Control
}
trackURL, err := urlParse(rawURL)
if err != nil {
return nil, err
}
req := &tcp.Request{
Method: MethodSetup,
URL: trackURL,
Header: map[string][]string{
"Transport": {fmt.Sprintf(
// i - RTP (data channel)
// i+1 - RTCP (control channel)
"RTP/AVP/TCP;unicast;interleaved=%d-%d", ch*2, ch*2+1,
)},
},
}
var res *tcp.Response
res, err = c.Do(req)
if err != nil {
// some Dahua/Amcrest cameras fail here because two simultaneous
// backchannel connections
if c.Backchannel {
c.Backchannel = false
if err := c.Dial(); err != nil {
return nil, err
}
if err := c.Describe(); err != nil {
return nil, err
}
for _, newMedia := range c.Medias {
if newMedia.Control == media.Control {
return c.SetupMedia(newMedia, newMedia.Codecs[0], false)
}
}
}
return nil, err
}
if c.Session == "" {
// Session: 216525287999;timeout=60
if s := res.Header.Get("Session"); s != "" {
if j := strings.IndexByte(s, ';'); j > 0 {
s = s[:j]
}
c.Session = s
}
}
// in case the track has already been setup before
if codec == nil {
c.state = StateSetup
return nil, nil
}
// we send our `interleaved`, but camera can answer with another
// Transport: RTP/AVP/TCP;unicast;interleaved=10-11;ssrc=10117CB7
// Transport: RTP/AVP/TCP;unicast;destination=192.168.1.111;source=192.168.1.222;interleaved=0
// Transport: RTP/AVP/TCP;ssrc=22345682;interleaved=0-1
s := res.Header.Get("Transport")
// TODO: rewrite
if !strings.HasPrefix(s, "RTP/AVP/TCP;") {
// Escam Q6 has a bug:
// Transport: RTP/AVP;unicast;destination=192.168.1.111;source=192.168.1.222;interleaved=0-1
if !strings.Contains(s, ";interleaved=") {
return nil, fmt.Errorf("wrong transport: %s", s)
}
}
i := strings.Index(s, "interleaved=")
if i < 0 {
return nil, fmt.Errorf("wrong transport: %s", s)
}
s = s[i+len("interleaved="):]
i = strings.IndexAny(s, "-;")
if i > 0 {
s = s[:i]
}
ch, err = strconv.Atoi(s)
if err != nil {
return nil, err
}
track := streamer.NewTrack(codec, media.Direction)
switch track.Direction {
case streamer.DirectionSendonly:
if c.channels == nil {
c.channels = make(map[byte]*streamer.Track)
}
c.channels[byte(ch)] = track
case streamer.DirectionRecvonly:
track = c.bindTrack(track, byte(ch), codec.PayloadType)
}
c.state = StateSetup
c.tracks = append(c.tracks, track)
return track, nil
}
func (c *Conn) Play() (err error) {
c.stateMu.Lock()
defer c.stateMu.Unlock()
if c.state != StateSetup {
return fmt.Errorf("RTSP PLAY from wrong state: %s", c.state)
}
req := &tcp.Request{Method: MethodPlay, URL: c.URL}
if err = c.Request(req); err == nil {
c.state = StatePlay
}
return
}
func (c *Conn) Teardown() (err error) {
// allow TEARDOWN from any state (ex. ANNOUNCE > SETUP)
req := &tcp.Request{Method: MethodTeardown, URL: c.URL}
return c.Request(req)
}
func (c *Conn) Close() error {
c.stateMu.Lock()
defer c.stateMu.Unlock()
if c.state == StateNone {
return nil
}
_ = c.Teardown()
c.state = StateNone
return c.conn.Close()
}
const transport = "RTP/AVP/TCP;unicast;interleaved="
func (c *Conn) Accept() error {
for {
req, err := tcp.ReadRequest(c.reader)
if err != nil {
return err
}
if c.URL == nil {
c.URL = req.URL
c.UserAgent = req.Header.Get("User-Agent")
}
c.Fire(req)
if !c.auth.Validate(req) {
res := &tcp.Response{
Status: "401 Unauthorized",
Header: map[string][]string{"Www-Authenticate": {`Basic realm="go2rtc"`}},
}
if err = c.Response(res); err != nil {
return err
}
continue
}
// Receiver: OPTIONS > DESCRIBE > SETUP... > PLAY > TEARDOWN
// Sender: OPTIONS > ANNOUNCE > SETUP... > RECORD > TEARDOWN
switch req.Method {
case MethodOptions:
res := &tcp.Response{
Header: map[string][]string{
"Public": {"OPTIONS, SETUP, TEARDOWN, DESCRIBE, PLAY, PAUSE, ANNOUNCE, RECORD"},
},
Request: req,
}
if err = c.Response(res); err != nil {
return err
}
case MethodAnnounce:
if req.Header.Get("Content-Type") != "application/sdp" {
return errors.New("wrong content type")
}
c.Medias, err = UnmarshalSDP(req.Body)
if err != nil {
return err
}
// TODO: fix someday...
c.channels = map[byte]*streamer.Track{}
for i, media := range c.Medias {
track := streamer.NewTrack(media.Codecs[0], media.Direction)
c.tracks = append(c.tracks, track)
c.channels[byte(i<<1)] = track
}
c.mode = ModeServerProducer
c.Fire(MethodAnnounce)
res := &tcp.Response{Request: req}
if err = c.Response(res); err != nil {
return err
}
case MethodDescribe:
c.mode = ModeServerConsumer
c.Fire(MethodDescribe)
if c.tracks == nil {
res := &tcp.Response{
Status: "404 Not Found",
Request: req,
}
return c.Response(res)
}
res := &tcp.Response{
Header: map[string][]string{
"Content-Type": {"application/sdp"},
},
Request: req,
}
// convert tracks to real output medias medias
var medias []*streamer.Media
for _, track := range c.tracks {
media := &streamer.Media{
Kind: streamer.GetKind(track.Codec.Name),
Direction: streamer.DirectionSendonly,
Codecs: []*streamer.Codec{track.Codec},
}
medias = append(medias, media)
}
res.Body, err = streamer.MarshalSDP(c.SessionName, medias)
if err != nil {
return err
}
if err = c.Response(res); err != nil {
return err
}
case MethodSetup:
tr := req.Header.Get("Transport")
res := &tcp.Response{
Header: map[string][]string{},
Request: req,
}
if strings.HasPrefix(tr, transport) {
c.Session = "1" // TODO: fixme
c.state = StateSetup
res.Header.Set("Transport", tr[:len(transport)+3])
} else {
res.Status = "461 Unsupported transport"
}
if err = c.Response(res); err != nil {
return err
}
case MethodRecord, MethodPlay:
res := &tcp.Response{Request: req}
if err = c.Response(res); err == nil {
c.state = StatePlay
}
return err
case MethodTeardown:
res := &tcp.Response{Request: req}
_ = c.Response(res)
c.state = StateNone
return c.conn.Close()
default:
return fmt.Errorf("unsupported method: %s", req.Method)
}
}
}
func (c *Conn) Handle() (err error) {
c.stateMu.Lock()
switch c.state {
case StateNone: // Close after PLAY and before Handle is OK (because SETUP after PLAY)
case StatePlay:
c.state = StateHandle
default:
err = fmt.Errorf("RTSP HANDLE from wrong state: %s", c.state)
c.state = StateNone
_ = c.conn.Close()
}
ok := c.state == StateHandle
c.stateMu.Unlock()
if !ok {
return
}
defer func() {
c.stateMu.Lock()
defer c.stateMu.Unlock()
if c.state == StateNone {
err = nil
return
}
// may have gotten here because of the deadline
// so close the connection to stop keepalive
c.state = StateNone
_ = c.conn.Close()
}()
var timeout time.Duration
switch c.mode {
case ModeClientProducer:
// polling frames from remote RTSP Server (ex Camera)
timeout = time.Second * 5
go c.keepalive()
case ModeServerProducer:
// polling frames from remote RTSP Client (ex FFmpeg)
timeout = time.Second * 15
case ModeServerConsumer:
// pushing frames to remote RTSP Client (ex VLC)
timeout = time.Second * 60
default:
return fmt.Errorf("wrong RTSP conn mode: %d", c.mode)
}
for {
if c.state == StateNone {
return
}
if err = c.conn.SetReadDeadline(time.Now().Add(timeout)); err != nil {
return
}
// we can read:
// 1. RTP interleaved: `$` + 1B channel number + 2B size
// 2. RTSP response: RTSP/1.0 200 OK
// 3. RTSP request: OPTIONS ...
var buf4 []byte // `$` + 1B channel number + 2B size
buf4, err = c.reader.Peek(4)
if err != nil {
return
}
if buf4[0] != '$' {
switch string(buf4) {
case "RTSP":
var res *tcp.Response
if res, err = tcp.ReadResponse(c.reader); err != nil {
return
}
c.Fire(res)
case "OPTI", "TEAR", "DESC", "SETU", "PLAY", "PAUS", "RECO", "ANNO", "GET_", "SET_":
var req *tcp.Request
if req, err = tcp.ReadRequest(c.reader); err != nil {
return
}
c.Fire(req)
default:
return fmt.Errorf("RTSP wrong input")
}
continue
}
// hope that the odd channels are always RTCP
channelID := buf4[1]
// get data size
size := int(binary.BigEndian.Uint16(buf4[2:]))
if _, err = c.reader.Discard(4); err != nil {
return
}
// init memory for data
buf := make([]byte, size)
if _, err = io.ReadFull(c.reader, buf); err != nil {
return
}
c.receive += size
if channelID&1 == 0 {
packet := &rtp.Packet{}
if err = packet.Unmarshal(buf); err != nil {
return
}
track := c.channels[channelID]
if track != nil {
_ = track.WriteRTP(packet)
//return fmt.Errorf("wrong channelID: %d", channelID)
} else {
continue // TODO: maybe fix this
//panic("wrong channelID")
}
} else {
msg := &RTCP{Channel: channelID}
if err = msg.Header.Unmarshal(buf); err != nil {
continue
}
msg.Packets, err = rtcp.Unmarshal(buf)
if err != nil {
continue
}
c.Fire(msg)
}
}
}
func (c *Conn) keepalive() {
// TODO: rewrite to RTCP
req := &tcp.Request{Method: MethodOptions, URL: c.URL}
for {
time.Sleep(time.Second * 25)
if c.state == StateNone {
return
}
if err := c.Request(req); err != nil {
return
}
}
}
func (c *Conn) GetChannel(media *streamer.Media) int {
for i, m := range c.Medias {
if m == media {
return i
}
}
return -1
}
func (c *Conn) bindTrack(
track *streamer.Track, channel uint8, payloadType uint8,
) *streamer.Track {
push := func(packet *rtp.Packet) error {
if c.state == StateNone {
return nil
}
packet.Header.PayloadType = payloadType
size := packet.MarshalSize()
//log.Printf("[RTP] codec: %s, size: %6d, ts: %10d, pt: %2d, ssrc: %d, seq: %d, mark: %v", track.Codec.Name, len(packet.Payload), packet.Timestamp, packet.PayloadType, packet.SSRC, packet.SequenceNumber, packet.Marker)
data := make([]byte, 4+size)
data[0] = '$'
data[1] = channel
binary.BigEndian.PutUint16(data[2:], uint16(size))
if _, err := packet.MarshalTo(data[4:]); err != nil {
return nil
}
if _, err := c.conn.Write(data); err != nil {
return err
}
c.send += size
return nil
}
if !track.Codec.IsRTP() {
switch track.Codec.Name {
case streamer.CodecH264:
wrapper := h264.RTPPay(1500)
push = wrapper(push)
case streamer.CodecAAC:
wrapper := aac.RTPPay(1500)
push = wrapper(push)
case streamer.CodecJPEG:
wrapper := mjpeg.RTPPay()
push = wrapper(push)
}
}
return track.Bind(push)
}