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ghostream/stream/srt/srt.go

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package srt
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// #include <srt/srt.h>
import "C"
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import (
"log"
"net"
"strconv"
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"strings"
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"github.com/haivision/srtgo"
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"gitlab.crans.org/nounous/ghostream/auth"
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)
// Options holds web package configuration
type Options struct {
ListenAddress string
MaxClients int
}
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// Packet contains the necessary data to broadcast events like stream creating, packet receiving or stream closing.
type Packet struct {
Data []byte
PacketType string
StreamName string
}
// Split host and port from listen address
func splitHostPort(hostport string) (string, uint16) {
host, portS, err := net.SplitHostPort(hostport)
if err != nil {
log.Fatalf("Failed to split host and port from %s", hostport)
}
if host == "" {
host = "0.0.0.0"
}
port64, err := strconv.ParseUint(portS, 10, 16)
if err != nil {
log.Fatalf("Port is not a integer: %s", err)
}
return host, uint16(port64)
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}
// Serve SRT server
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func Serve(cfg *Options, authBackend auth.Backend, forwardingChannel chan Packet) {
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// Start SRT in listening mode
log.Printf("SRT server listening on %s", cfg.ListenAddress)
host, port := splitHostPort(cfg.ListenAddress)
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sck := srtgo.NewSrtSocket(host, port, nil)
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if err := sck.Listen(cfg.MaxClients); err != nil {
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log.Fatal("Unable to listen for SRT clients:", err)
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}
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clientDataChannels := make([]chan Packet, 0, cfg.MaxClients)
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for {
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// Wait for new connection
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s, err := sck.Accept()
if err != nil {
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// Something wrong happenned
continue
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}
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// streamid can be "name:password" for streamer or "name" for viewer
streamID, err := s.GetSockOptString(C.SRTO_STREAMID)
if err != nil {
log.Print("Failed to get socket streamid")
continue
}
split := strings.Split(streamID, ":")
if len(split) > 1 {
// password was provided so it is a streamer
name, password := split[0], split[1]
if authBackend != nil {
// check password
if ok, err := authBackend.Login(name, password); !ok || err != nil {
log.Printf("Failed to authenticate for stream %s", name)
s.Close()
continue
}
}
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go handleStreamer(s, name, &clientDataChannels, forwardingChannel)
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} else {
// password was not provided so it is a viewer
name := split[0]
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dataChannel := make(chan Packet, 4096)
clientDataChannels = append(clientDataChannels, dataChannel)
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go handleViewer(s, name, dataChannel, &clientDataChannels)
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}
}
}
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func handleStreamer(s *srtgo.SrtSocket, name string, clientDataChannels *[]chan Packet, forwardingChannel chan Packet) {
log.Printf("New SRT streamer for stream %s", name)
// Create a new buffer
buff := make([]byte, 2048)
// Setup stream forwarding
forwardingChannel <- Packet{StreamName: name, PacketType: "register", Data: nil}
// Read RTP packets forever and send them to the WebRTC Client
for {
n, err := s.Read(buff, 10000)
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if err != nil {
log.Println("Error occured while reading SRT socket:", err)
break
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}
if n == 0 {
// End of stream
log.Printf("Received no bytes, stopping stream.")
break
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}
// log.Printf("Received %d bytes", n)
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// Send raw packet to other streams
// Copy data in another buffer to ensure that the data would not be overwritten
data := make([]byte, n)
copy(data, buff[:n])
forwardingChannel <- Packet{StreamName: name, PacketType: "sendData", Data: data}
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for _, dataChannel := range *clientDataChannels {
dataChannel <- Packet{StreamName: name, PacketType: "sendData", Data: data}
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}
// TODO: Send to WebRTC
// See https://github.com/ebml-go/webm/blob/master/reader.go
//err := videoTrack.WriteSample(media.Sample{Data: data, Samples: uint32(sampleCount)})
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}
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forwardingChannel <- Packet{StreamName: name, PacketType: "close", Data: nil}
}
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func handleViewer(s *srtgo.SrtSocket, name string, dataChannel chan Packet, dataChannels *[]chan Packet) {
// FIXME Should not pass all dataChannels to one viewer
log.Printf("New SRT viewer for stream %s", name)
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// Receive packets from channel and send them
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for {
packet := <-dataChannel
if packet.PacketType == "sendData" {
_, err := s.Write(packet.Data, 10000)
if err != nil {
s.Close()
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for i, channel := range *dataChannels {
if channel == dataChannel {
*dataChannels = append((*dataChannels)[:i], (*dataChannels)[i+1:]...)
}
}
return
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}
}
}
}