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import ( "context" "crypto/tls" "fmt" "net" "strings" "time"
"github.com/bluenviron/gortmplib" "github.com/bluenviron/gortmplib/pkg/h264conf" "github.com/bluenviron/gortmplib/pkg/message" "github.com/bluenviron/gortsplib/v5/pkg/format" "golang.org/x/sync/errgroup" "stream.place/streamplace/pkg/config" "stream.place/streamplace/pkg/log" "stream.place/streamplace/pkg/media")
// This example shows how to:// 1. create a RTMP server// 2. accept a stream from a reader.// 3. broadcast the stream to readers.
var RTMPTimeout = 10 * time.Second
const RTMPPrefix = "/live/"
func (a *StreamplaceAPI) HandleRTMPPublisher(ctx context.Context, sc *gortmplib.ServerConn) error { err := sc.RW.(net.Conn).SetReadDeadline(time.Now().Add(RTMPTimeout)) if err != nil { return err }
if !strings.HasPrefix(sc.URL.Path, RTMPPrefix) { return fmt.Errorf("RTMP publisher is not allowed to publish to %s (must start with %s)", sc.URL.String(), RTMPPrefix) } streamKey := strings.TrimPrefix(sc.URL.Path, RTMPPrefix) mediaSigner, err := a.MakeMediaSigner(ctx, streamKey) if err != nil { return fmt.Errorf("failed to make media signer: %w", err) }
streamer := mediaSigner.Streamer() ctx = log.WithLogValues(ctx, "streamer", streamer) session := &media.RTMPSession{ EventChan: make(chan any, 1024), MediaSigner: mediaSigner, } a.rtmpSessionsLock.Lock() a.rtmpSessions[streamer] = session a.rtmpSessionsLock.Unlock()
defer func() { a.rtmpSessionsLock.Lock() delete(a.rtmpSessions, streamer) a.rtmpSessionsLock.Unlock() close(session.EventChan) }()
r := &gortmplib.Reader{ Conn: sc, } err = r.Initialize() if err != nil { return err }
for _, track := range r.Tracks() { log.Log(ctx, "get track", "track", track)
switch track := track.(type) { case *format.H264: session.VideoTrack = track r.OnDataH264(track, func(pts time.Duration, dts time.Duration, au [][]byte) { // log.Log(ctx, "got H264", "len", len(au), "pts", pts, "dts", dts) session.EventChan <- &media.RTMPH264Data{ AU: au, PTS: pts, DTS: dts, } })
case *format.MPEG4Audio: session.AudioTrack = track r.OnDataMPEG4Audio(track, func(pts time.Duration, au []byte) { // log.Log(ctx, "got MPEG4Au", "len", len(au), "pts", pts) session.EventChan <- &media.RTMPAACData{ AU: au, PTS: pts, } })
default: return fmt.Errorf("unsupported track type: %T", track) } }
g, ctx := errgroup.WithContext(ctx) g.Go(func() error { for { if ctx.Err() != nil { return ctx.Err() } err = sc.RW.(net.Conn).SetReadDeadline(time.Now().Add(RTMPTimeout)) if err != nil { return err } err = r.Read() if err != nil { return err } } })
g.Go(func() error { return a.MediaManager.RTMPIngest(ctx, fmt.Sprintf("rtmp://%s/live/%s", a.rtmpInternalPlaybackAddr, streamer), mediaSigner) })
return g.Wait()}
func (a *StreamplaceAPI) HandleRTMPPlayback(ctx context.Context, sc *gortmplib.ServerConn) error { if !strings.HasPrefix(sc.URL.Path, RTMPPrefix) { return fmt.Errorf("RTMP publisher is not allowed to publish to %s (must start with %s)", sc.URL.String(), RTMPPrefix) } streamer := strings.TrimPrefix(sc.URL.Path, RTMPPrefix) a.rtmpSessionsLock.Lock() session, ok := a.rtmpSessions[streamer] a.rtmpSessionsLock.Unlock() if !ok { return fmt.Errorf("RTMP session not found for streamer %s", streamer) }
return relayRTMPSession(ctx, sc, session)}
// relayRTMPSession writes a publisher's session out to conn, the internal// playback connection the ingest pipeline reads with rtmp2src, until the// session closes or ctx ends.func relayRTMPSession(ctx context.Context, conn gortmplib.Conn, session *media.RTMPSession) error { tracks := []format.Format{} if session.VideoTrack != nil { tracks = append(tracks, session.VideoTrack) } if session.AudioTrack != nil { tracks = append(tracks, session.AudioTrack) } w := &gortmplib.Writer{ Conn: conn, Tracks: tracks, } err := w.Initialize() if err != nil { return err } for { select { case <-ctx.Done(): return ctx.Err() case event := <-session.EventChan: if event == nil { return fmt.Errorf("RTMP session closed") } switch event := event.(type) { case *media.RTMPH264Data: // gortmplib's reader hands on an AVC sequence header as an AU // of just SPS and PPS, including the stream's first one, which // it replays after reading ahead for the tracks. Written back as // a frame, it takes the timestamp of the keyframe after it, and // h264parse drops that keyframe's PTS, which fails the // segmenter's muxer. Write it as the sequence header it was. if msg, ok := h264ConfigMessage(event.AU, event.DTS); ok { if err := conn.Write(msg); err != nil { return fmt.Errorf("error writing H264 config: %w", err) } continue } err := w.WriteH264(session.VideoTrack, event.PTS, event.DTS, event.AU) if err != nil { return fmt.Errorf("error writing H264: %w", err) } case *media.RTMPAACData: err := w.WriteMPEG4Audio(session.AudioTrack, event.PTS, event.AU) if err != nil { return fmt.Errorf("error writing MPEG4Audio: %w", err) } default: return fmt.Errorf("unsupported event type: %T", event) } } }}
func (a *StreamplaceAPI) HandleRTMPPublishConn(ctx context.Context, conn net.Conn) error { err := conn.SetReadDeadline(time.Now().Add(RTMPTimeout)) if err != nil { return err }
sc := &gortmplib.ServerConn{ RW: conn, } err = sc.Initialize() if err != nil { return err }
err = sc.Accept() if err != nil { return err }
if sc.Publish { return a.HandleRTMPPublisher(ctx, sc) } return fmt.Errorf("RTMP playback is not allowed")}
func (a *StreamplaceAPI) HandleRTMPPlaybackConn(ctx context.Context, conn net.Conn) error { err := conn.SetReadDeadline(time.Now().Add(RTMPTimeout)) if err != nil { return err }
sc := &gortmplib.ServerConn{ RW: conn, } err = sc.Initialize() if err != nil { return err }
err = sc.Accept() if err != nil { return err }
if !sc.Publish { return a.HandleRTMPPlayback(ctx, sc) } return fmt.Errorf("RTMP playback is not allowed")}
func (a *StreamplaceAPI) ServeRTMP(ctx context.Context) error { ln, err := net.Listen("tcp", a.CLI.RTMPAddr) if err != nil { return fmt.Errorf("failed to listen: %w", err) } defer ln.Close()
go func() { <-ctx.Done() ln.Close() }()
log.Log(ctx, "rtmp server starting", "addr", a.CLI.RTMPAddr)
g, ctx := errgroup.WithContext(ctx) g.Go(func() error { return a.ServeRTMPInternalPlayback(ctx) }) g.Go(func() error { for { if ctx.Err() != nil { return ctx.Err() } conn, err := ln.Accept() if err != nil { return fmt.Errorf("error accepting RTMP connection: %w", err) } go func() { err := a.HandleRTMPPublishConn(ctx, conn) if err != nil { log.Error(ctx, "error handling RTMP publish connection", "error", err) } }() } })
return g.Wait()}
// Serve RTMP internal playback server for gstreamer to pull fromfunc (a *StreamplaceAPI) ServeRTMPInternalPlayback(ctx context.Context) error { ln, err := net.Listen("tcp", "127.0.0.1:0") if err != nil { return fmt.Errorf("failed to listen: %w", err) } addr := ln.Addr().String() defer ln.Close()
_, port, err := net.SplitHostPort(addr) if err != nil { return fmt.Errorf("failed to split host and port: %w", err) }
go func() { <-ctx.Done() ln.Close() }()
a.rtmpInternalPlaybackAddr = fmt.Sprintf("127.0.0.1:%s", port)
log.Log(ctx, "rtmp internal playback server starting", "addr", a.rtmpInternalPlaybackAddr)
// Accept loop in a goroutine so we can select on context.Done for { if ctx.Err() != nil { return ctx.Err() } conn, err := ln.Accept() if err != nil { return fmt.Errorf("error accepting RTMP connection: %w", err) }
go func() { err := a.HandleRTMPPlaybackConn(ctx, conn) if err != nil { log.Error(ctx, "error handling RTMP internal playback connection", "error", err) } }() }}
func (a *StreamplaceAPI) ServeRTMPS(ctx context.Context, cli *config.CLI) error { var tlsConfig *tls.Config if a.ACME != nil { tlsConfig = a.ACME.TLSConfig() } else { cert, err := tls.LoadX509KeyPair(cli.TLSCertPath, cli.TLSKeyPath) if err != nil { return fmt.Errorf("failed to load TLS certificate: %w", err) } tlsConfig = &tls.Config{ Certificates: []tls.Certificate{cert}, MinVersion: tls.VersionTLS12, } }
ln, err := tls.Listen("tcp", cli.RTMPSAddr, tlsConfig) if err != nil { return fmt.Errorf("failed to create RTMPS listener: %w", err) }
log.Log(ctx, "rtmps server starting", "addr", cli.RTMPAddr)
go func() { <-ctx.Done() ln.Close() }()
g, ctx := errgroup.WithContext(ctx) g.Go(func() error { return a.ServeRTMPInternalPlayback(ctx) }) g.Go(func() error { for { if ctx.Err() != nil { return ctx.Err() } conn, err := ln.Accept() if err != nil { return fmt.Errorf("error accepting RTMP connection: %w", err) } go func() { err := a.HandleRTMPPublishConn(ctx, conn) if err != nil { log.Error(ctx, "error handling RTMP publish connection", "error", err) } }() } })
return g.Wait()}
// h264ConfigMessage returns the FLV sequence header for an H.264 access unit// that holds nothing but parameter sets (one SPS and one PPS), or false for// any other AU.func h264ConfigMessage(au [][]byte, dts time.Duration) (*message.Video, bool) { var conf h264conf.Conf for _, nalu := range au { if len(nalu) == 0 { return nil, false } switch nalu[0] & 0x1f { case 7: // SPS if conf.SPS != nil { return nil, false } conf.SPS = nalu case 8: // PPS if conf.PPS != nil { return nil, false } conf.PPS = nalu default: return nil, false } } if conf.SPS == nil || conf.PPS == nil { return nil, false } buf, err := conf.Marshal() if err != nil { return nil, false } return &message.Video{ ChunkStreamID: message.VideoChunkStreamID, MessageStreamID: 0x1000000, Codec: message.CodecH264, IsKeyFrame: true, Type: message.VideoTypeConfig, Payload: buf, DTS: dts, }, true}