533 lines
12 KiB
Go
533 lines
12 KiB
Go
package core
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import (
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"context"
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"errors"
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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/pion/rtp"
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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/rtcpsenderset"
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"github.com/aler9/rtsp-simple-server/internal/rtmp"
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)
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const (
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rtmpConnPauseAfterAuthError = 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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rtmpConnPTSOffset = 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 rtmpConnTrackIDPayloadPair struct {
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trackID int
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buf []byte
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}
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type rtmpConnParent interface {
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Log(logger.Level, string, ...interface{})
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OnConnClose(*rtmpConn)
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}
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type rtmpConn 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
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conn *rtmp.Conn
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pathManager *pathManager
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parent rtmpConnParent
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ctx context.Context
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ctxCancel func()
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path *path
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ringBuffer *ringbuffer.RingBuffer // read
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}
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func newRTMPConn(
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parentCtx context.Context,
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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,
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nconn net.Conn,
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pathManager *pathManager,
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parent rtmpConnParent) *rtmpConn {
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ctx, ctxCancel := context.WithCancel(parentCtx)
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c := &rtmpConn{
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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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pathManager: pathManager,
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parent: parent,
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ctx: ctx,
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ctxCancel: ctxCancel,
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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 *rtmpConn) ParentClose() {
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c.log(logger.Info, "closed")
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}
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// Close closes a Conn.
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func (c *rtmpConn) Close() {
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c.ctxCancel()
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}
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// IsSource implements source.
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func (c *rtmpConn) IsSource() {}
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func (c *rtmpConn) log(level logger.Level, format string, args ...interface{}) {
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c.parent.Log(level, "[conn %v] "+format, append([]interface{}{c.conn.NetConn().RemoteAddr()}, args...)...)
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}
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func (c *rtmpConn) 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 *rtmpConn) 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(c.ctx)
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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.ctx.Done():
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cancel()
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<-runErr
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}
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c.ctxCancel()
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c.parent.OnConnClose(c)
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}
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func (c *rtmpConn) 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 *rtmpConn) runRead(ctx context.Context) error {
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pathName, query := pathNameAndQuery(c.conn.URL())
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res := c.pathManager.OnReaderSetupPlay(pathReaderSetupPlayReq{
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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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})
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if res.Err != nil {
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if terr, ok := res.Err.(pathErrAuthCritical); ok {
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// wait some seconds to stop brute force attacks
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<-time.After(rtmpConnPauseAfterAuthError)
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return errors.New(terr.Message)
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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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defer func() {
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c.path.OnReaderRemove(pathReaderRemoveReq{Author: c})
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}()
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var videoTrack *gortsplib.Track
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videoTrackID := -1
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var h264Decoder *rtph264.Decoder
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var audioTrack *gortsplib.Track
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audioTrackID := -1
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var audioClockRate int
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var aacDecoder *rtpaac.Decoder
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for i, t := range res.Stream.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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videoTrackID = i
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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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audioTrackID = i
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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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c.path.OnReaderPlay(pathReaderPlayReq{
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Author: c,
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})
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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.(rtmpConnTrackIDPayloadPair)
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if videoTrack != nil && pair.trackID == videoTrackID {
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var pkt rtp.Packet
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err := pkt.Unmarshal(pair.buf)
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if err != nil {
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c.log(logger.Warn, "unable to decode RTP packet: %v", err)
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continue
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}
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nalus, pts, err := h264Decoder.DecodeRTP(&pkt)
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if err != nil {
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if err != rtph264.ErrMorePacketsNeeded && err != rtph264.ErrNonStartingPacketAndNoPrevious {
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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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if pkt.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 + rtmpConnPTSOffset)
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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 + rtmpConnPTSOffset - 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 == audioTrackID {
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var pkt rtp.Packet
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err := pkt.Unmarshal(pair.buf)
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if err != nil {
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c.log(logger.Warn, "unable to decode RTP packet: %v", err)
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continue
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}
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aus, pts, err := aacDecoder.DecodeRTP(&pkt)
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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 + rtmpConnPTSOffset + 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 *rtmpConn) 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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videoTrackID := -1
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audioTrackID := -1
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var h264Encoder *rtph264.Encoder
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if videoTrack != nil {
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h264Encoder = rtph264.NewEncoder(96, nil, nil, nil)
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videoTrackID = len(tracks)
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tracks = append(tracks, videoTrack)
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}
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var aacEncoder *rtpaac.Encoder
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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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audioTrackID = len(tracks)
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tracks = append(tracks, audioTrack)
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}
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pathName, query := pathNameAndQuery(c.conn.URL())
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res := c.pathManager.OnPublisherAnnounce(pathPublisherAnnounceReq{
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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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})
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if res.Err != nil {
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if terr, ok := res.Err.(pathErrAuthCritical); ok {
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// wait some seconds to stop brute force attacks
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<-time.After(rtmpConnPauseAfterAuthError)
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return errors.New(terr.Message)
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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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defer func() {
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c.path.OnPublisherRemove(pathPublisherRemoveReq{Author: c})
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}()
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// disable write deadline
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c.conn.NetConn().SetWriteDeadline(time.Time{})
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rres := c.path.OnPublisherRecord(pathPublisherRecordReq{Author: c})
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if rres.Err != nil {
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return rres.Err
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}
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rtcpSenders := rtcpsenderset.New(tracks, c.path.OnSourceFrame)
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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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c.path.OnSourceFrame(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(videoTrackID, 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(audioTrackID, 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 *rtmpConn) 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 pathErrAuthCritical{
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Message: "wrong username or password",
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}
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}
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return nil
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}
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// OnReaderAccepted implements reader.
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func (c *rtmpConn) OnReaderAccepted() {
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c.log(logger.Info, "is reading from path '%s'", c.path.Name())
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}
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// OnReaderFrame implements reader.
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func (c *rtmpConn) OnReaderFrame(trackID int, streamType gortsplib.StreamType, payload []byte) {
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if streamType == gortsplib.StreamTypeRTP {
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c.ringBuffer.Push(rtmpConnTrackIDPayloadPair{trackID, payload})
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}
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}
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// OnPublisherAccepted implements publisher.
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func (c *rtmpConn) OnPublisherAccepted(tracksLen int) {
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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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tracksLen,
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func() string {
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if tracksLen == 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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}
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