544 lines
13 KiB
Go
544 lines
13 KiB
Go
package rtmpconn
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import (
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"context"
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"fmt"
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"io"
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"net"
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"net/url"
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"strings"
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"sync"
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"time"
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"github.com/aler9/gortsplib"
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"github.com/aler9/gortsplib/pkg/headers"
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"github.com/aler9/gortsplib/pkg/ringbuffer"
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"github.com/aler9/gortsplib/pkg/rtpaac"
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"github.com/aler9/gortsplib/pkg/rtph264"
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"github.com/notedit/rtmp/av"
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"github.com/aler9/rtsp-simple-server/internal/externalcmd"
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"github.com/aler9/rtsp-simple-server/internal/h264"
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"github.com/aler9/rtsp-simple-server/internal/logger"
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"github.com/aler9/rtsp-simple-server/internal/readpublisher"
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"github.com/aler9/rtsp-simple-server/internal/rtcpsenderset"
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"github.com/aler9/rtsp-simple-server/internal/rtmp"
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"github.com/aler9/rtsp-simple-server/internal/stats"
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)
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const (
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pauseAfterAuthError = 2 * time.Second
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// an offset is needed to
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// - avoid negative PTS values
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// - avoid PTS < DTS during startup
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ptsOffset = 2 * time.Second
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)
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func pathNameAndQuery(inURL *url.URL) (string, url.Values) {
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// remove leading and trailing slashes inserted by OBS and some other clients
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tmp := strings.TrimRight(inURL.String(), "/")
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ur, _ := url.Parse(tmp)
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pathName := strings.TrimLeft(ur.Path, "/")
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return pathName, ur.Query()
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}
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type trackIDPayloadPair struct {
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trackID int
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buf []byte
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}
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// PathMan is implemented by pathman.PathMan.
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type PathMan interface {
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OnReadPublisherSetupPlay(readpublisher.SetupPlayReq)
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OnReadPublisherAnnounce(readpublisher.AnnounceReq)
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}
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// Parent is implemented by rtmpserver.Server.
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type Parent interface {
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Log(logger.Level, string, ...interface{})
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OnConnClose(*Conn)
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}
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// Conn is a server-side RTMP connection.
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type Conn struct {
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rtspAddress string
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readTimeout time.Duration
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writeTimeout time.Duration
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readBufferCount int
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runOnConnect string
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runOnConnectRestart bool
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wg *sync.WaitGroup
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stats *stats.Stats
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conn *rtmp.Conn
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pathMan PathMan
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parent Parent
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path readpublisher.Path
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ringBuffer *ringbuffer.RingBuffer // read
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// in
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terminate chan struct{}
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parentTerminate chan struct{}
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}
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// New allocates a Conn.
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func New(
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rtspAddress string,
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readTimeout time.Duration,
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writeTimeout time.Duration,
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readBufferCount int,
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runOnConnect string,
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runOnConnectRestart bool,
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wg *sync.WaitGroup,
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stats *stats.Stats,
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nconn net.Conn,
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pathMan PathMan,
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parent Parent) *Conn {
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c := &Conn{
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rtspAddress: rtspAddress,
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readTimeout: readTimeout,
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writeTimeout: writeTimeout,
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readBufferCount: readBufferCount,
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runOnConnect: runOnConnect,
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runOnConnectRestart: runOnConnectRestart,
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wg: wg,
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stats: stats,
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conn: rtmp.NewServerConn(nconn),
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pathMan: pathMan,
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parent: parent,
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terminate: make(chan struct{}, 1),
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parentTerminate: make(chan struct{}),
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}
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c.log(logger.Info, "opened")
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c.wg.Add(1)
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go c.run()
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return c
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}
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// ParentClose closes a Conn.
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func (c *Conn) ParentClose() {
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c.log(logger.Info, "closed")
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close(c.parentTerminate)
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}
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// Close closes a Conn.
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func (c *Conn) Close() {
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select {
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case c.terminate <- struct{}{}:
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default:
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}
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}
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// IsReadPublisher implements readpublisher.ReadPublisher.
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func (c *Conn) IsReadPublisher() {}
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// IsSource implements source.Source.
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func (c *Conn) IsSource() {}
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func (c *Conn) log(level logger.Level, format string, args ...interface{}) {
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c.parent.Log(level, "[client %v] "+format, append([]interface{}{c.conn.NetConn().RemoteAddr()}, args...)...)
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}
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func (c *Conn) ip() net.IP {
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return c.conn.NetConn().RemoteAddr().(*net.TCPAddr).IP
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}
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func (c *Conn) run() {
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defer c.wg.Done()
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if c.runOnConnect != "" {
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_, port, _ := net.SplitHostPort(c.rtspAddress)
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onConnectCmd := externalcmd.New(c.runOnConnect, c.runOnConnectRestart, externalcmd.Environment{
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Path: "",
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Port: port,
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})
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defer onConnectCmd.Close()
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}
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ctx, cancel := context.WithCancel(context.Background())
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runErr := make(chan error)
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go func() {
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runErr <- c.runInner(ctx)
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}()
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select {
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case err := <-runErr:
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cancel()
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if err != io.EOF {
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c.log(logger.Info, "ERR: %s", err)
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}
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case <-c.terminate:
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cancel()
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<-runErr
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}
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if c.path != nil {
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res := make(chan struct{})
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c.path.OnReadPublisherRemove(readpublisher.RemoveReq{c, res}) //nolint:govet
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<-res
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}
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c.parent.OnConnClose(c)
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<-c.parentTerminate
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}
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func (c *Conn) runInner(ctx context.Context) error {
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go func() {
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<-ctx.Done()
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c.conn.NetConn().Close()
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}()
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c.conn.NetConn().SetReadDeadline(time.Now().Add(c.readTimeout))
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c.conn.NetConn().SetWriteDeadline(time.Now().Add(c.writeTimeout))
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err := c.conn.ServerHandshake()
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if err != nil {
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return err
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}
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if c.conn.IsPublishing() {
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return c.runPublish(ctx)
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}
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return c.runRead(ctx)
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}
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func (c *Conn) runRead(ctx context.Context) error {
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pathName, query := pathNameAndQuery(c.conn.URL())
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sres := make(chan readpublisher.SetupPlayRes)
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c.pathMan.OnReadPublisherSetupPlay(readpublisher.SetupPlayReq{
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Author: c,
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PathName: pathName,
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IP: c.ip(),
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ValidateCredentials: func(authMethods []headers.AuthMethod, pathUser string, pathPass string) error {
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return c.validateCredentials(pathUser, pathPass, query)
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},
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Res: sres})
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res := <-sres
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if res.Err != nil {
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if _, ok := res.Err.(readpublisher.ErrAuthCritical); ok {
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// wait some seconds to stop brute force attacks
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<-time.After(pauseAfterAuthError)
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}
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return res.Err
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}
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c.path = res.Path
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var videoTrack *gortsplib.Track
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var h264Decoder *rtph264.Decoder
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var audioTrack *gortsplib.Track
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var audioClockRate int
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var aacDecoder *rtpaac.Decoder
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for i, t := range res.Tracks {
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if t.IsH264() {
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if videoTrack != nil {
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return fmt.Errorf("can't read track %d with RTMP: too many tracks", i+1)
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}
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videoTrack = t
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h264Decoder = rtph264.NewDecoder()
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} else if t.IsAAC() {
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if audioTrack != nil {
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return fmt.Errorf("can't read track %d with RTMP: too many tracks", i+1)
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}
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audioTrack = t
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audioClockRate, _ = audioTrack.ClockRate()
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aacDecoder = rtpaac.NewDecoder(audioClockRate)
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}
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}
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if videoTrack == nil && audioTrack == nil {
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return fmt.Errorf("unable to find a video or audio track")
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}
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c.conn.NetConn().SetWriteDeadline(time.Now().Add(c.writeTimeout))
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c.conn.WriteMetadata(videoTrack, audioTrack)
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c.ringBuffer = ringbuffer.New(uint64(c.readBufferCount))
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go func() {
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<-ctx.Done()
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c.ringBuffer.Close()
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}()
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pres := make(chan readpublisher.PlayRes)
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c.path.OnReadPublisherPlay(readpublisher.PlayReq{c, pres}) //nolint:govet
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<-pres
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c.log(logger.Info, "is reading from path '%s'", c.path.Name())
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// disable read deadline
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c.conn.NetConn().SetReadDeadline(time.Time{})
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var videoBuf [][]byte
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videoDTSEst := h264.NewDTSEstimator()
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for {
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data, ok := c.ringBuffer.Pull()
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if !ok {
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return fmt.Errorf("terminated")
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}
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pair := data.(trackIDPayloadPair)
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if videoTrack != nil && pair.trackID == videoTrack.ID {
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nalus, pts, err := h264Decoder.Decode(pair.buf)
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if err != nil {
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if err != rtph264.ErrMorePacketsNeeded {
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c.log(logger.Warn, "unable to decode video track: %v", err)
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}
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continue
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}
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for _, nalu := range nalus {
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// remove SPS, PPS and AUD, not needed by RTSP
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typ := h264.NALUType(nalu[0] & 0x1F)
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switch typ {
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case h264.NALUTypeSPS, h264.NALUTypePPS, h264.NALUTypeAccessUnitDelimiter:
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continue
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}
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videoBuf = append(videoBuf, nalu)
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}
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// RTP marker means that all the NALUs with the same PTS have been received.
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// send them together.
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marker := (pair.buf[1] >> 7 & 0x1) > 0
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if marker {
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data, err := h264.EncodeAVCC(videoBuf)
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if err != nil {
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return err
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}
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dts := videoDTSEst.Feed(pts + ptsOffset)
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c.conn.NetConn().SetWriteDeadline(time.Now().Add(c.writeTimeout))
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err = c.conn.WritePacket(av.Packet{
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Type: av.H264,
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Data: data,
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Time: dts,
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CTime: pts + ptsOffset - dts,
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})
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if err != nil {
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return err
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}
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videoBuf = nil
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}
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} else if audioTrack != nil && pair.trackID == audioTrack.ID {
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aus, pts, err := aacDecoder.Decode(pair.buf)
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if err != nil {
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if err != rtpaac.ErrMorePacketsNeeded {
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c.log(logger.Warn, "unable to decode audio track: %v", err)
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}
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continue
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}
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for i, au := range aus {
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auPTS := pts + ptsOffset + time.Duration(i)*1000*time.Second/time.Duration(audioClockRate)
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c.conn.NetConn().SetWriteDeadline(time.Now().Add(c.writeTimeout))
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err := c.conn.WritePacket(av.Packet{
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Type: av.AAC,
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Data: au,
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Time: auPTS,
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})
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if err != nil {
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return err
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}
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}
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}
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}
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}
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func (c *Conn) runPublish(ctx context.Context) error {
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c.conn.NetConn().SetReadDeadline(time.Now().Add(c.readTimeout))
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videoTrack, audioTrack, err := c.conn.ReadMetadata()
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if err != nil {
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return err
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}
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var tracks gortsplib.Tracks
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var h264Encoder *rtph264.Encoder
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var aacEncoder *rtpaac.Encoder
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if videoTrack != nil {
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h264Encoder = rtph264.NewEncoder(96, nil, nil, nil)
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tracks = append(tracks, videoTrack)
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}
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if audioTrack != nil {
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clockRate, _ := audioTrack.ClockRate()
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aacEncoder = rtpaac.NewEncoder(96, clockRate, nil, nil, nil)
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tracks = append(tracks, audioTrack)
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}
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for i, t := range tracks {
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t.ID = i
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}
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pathName, query := pathNameAndQuery(c.conn.URL())
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resc := make(chan readpublisher.AnnounceRes)
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c.pathMan.OnReadPublisherAnnounce(readpublisher.AnnounceReq{
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Author: c,
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PathName: pathName,
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Tracks: tracks,
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IP: c.ip(),
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ValidateCredentials: func(authMethods []headers.AuthMethod, pathUser string, pathPass string) error {
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return c.validateCredentials(pathUser, pathPass, query)
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},
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Res: resc,
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})
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res := <-resc
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if res.Err != nil {
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if _, ok := res.Err.(readpublisher.ErrAuthCritical); ok {
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// wait some seconds to stop brute force attacks
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<-time.After(pauseAfterAuthError)
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}
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return res.Err
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}
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c.path = res.Path
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// disable write deadline
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c.conn.NetConn().SetWriteDeadline(time.Time{})
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rresc := make(chan readpublisher.RecordRes)
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c.path.OnReadPublisherRecord(readpublisher.RecordReq{Author: c, Res: rresc})
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rres := <-rresc
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if rres.Err != nil {
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return rres.Err
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}
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c.log(logger.Info, "is publishing to path '%s', %d %s",
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c.path.Name(),
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len(tracks),
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func() string {
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if len(tracks) == 1 {
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return "track"
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}
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return "tracks"
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}())
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var onPublishCmd *externalcmd.Cmd
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if c.path.Conf().RunOnPublish != "" {
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_, port, _ := net.SplitHostPort(c.rtspAddress)
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onPublishCmd = externalcmd.New(c.path.Conf().RunOnPublish,
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c.path.Conf().RunOnPublishRestart, externalcmd.Environment{
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Path: c.path.Name(),
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Port: port,
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})
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}
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defer func(path readpublisher.Path) {
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if path.Conf().RunOnPublish != "" {
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onPublishCmd.Close()
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}
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}(c.path)
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rtcpSenders := rtcpsenderset.New(tracks, rres.SP.OnFrame)
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defer rtcpSenders.Close()
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onFrame := func(trackID int, payload []byte) {
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rtcpSenders.OnFrame(trackID, gortsplib.StreamTypeRTP, payload)
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rres.SP.OnFrame(trackID, gortsplib.StreamTypeRTP, payload)
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}
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for {
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c.conn.NetConn().SetReadDeadline(time.Now().Add(c.readTimeout))
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pkt, err := c.conn.ReadPacket()
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if err != nil {
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return err
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}
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switch pkt.Type {
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case av.H264:
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if videoTrack == nil {
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return fmt.Errorf("ERR: received an H264 frame, but track is not set up")
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}
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nalus, err := h264.DecodeAVCC(pkt.Data)
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if err != nil {
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return err
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}
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var outNALUs [][]byte
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for _, nalu := range nalus {
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// remove SPS, PPS and AUD, not needed by RTSP
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typ := h264.NALUType(nalu[0] & 0x1F)
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switch typ {
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case h264.NALUTypeSPS, h264.NALUTypePPS, h264.NALUTypeAccessUnitDelimiter:
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continue
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}
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outNALUs = append(outNALUs, nalu)
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}
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if len(outNALUs) == 0 {
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continue
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}
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frames, err := h264Encoder.Encode(outNALUs, pkt.Time+pkt.CTime)
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if err != nil {
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return fmt.Errorf("ERR while encoding H264: %v", err)
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}
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for _, frame := range frames {
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onFrame(videoTrack.ID, frame)
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}
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case av.AAC:
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if audioTrack == nil {
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return fmt.Errorf("ERR: received an AAC frame, but track is not set up")
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}
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frames, err := aacEncoder.Encode([][]byte{pkt.Data}, pkt.Time+pkt.CTime)
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if err != nil {
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return fmt.Errorf("ERR while encoding AAC: %v", err)
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}
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for _, frame := range frames {
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onFrame(audioTrack.ID, frame)
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}
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default:
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return fmt.Errorf("ERR: unexpected packet: %v", pkt.Type)
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}
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}
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}
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func (c *Conn) validateCredentials(
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pathUser string,
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pathPass string,
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query url.Values,
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) error {
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if query.Get("user") != pathUser ||
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query.Get("pass") != pathPass {
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return readpublisher.ErrAuthCritical{}
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}
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return nil
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}
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// OnFrame implements path.Reader.
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func (c *Conn) OnFrame(trackID int, streamType gortsplib.StreamType, payload []byte) {
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if streamType == gortsplib.StreamTypeRTP {
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c.ringBuffer.Push(trackIDPayloadPair{trackID, payload})
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}
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}
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