105 lines
1.9 KiB
Go
105 lines
1.9 KiB
Go
package main
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import (
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"log"
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"net"
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"time"
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)
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type udpWrite struct {
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addr *net.UDPAddr
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buf []byte
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}
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type serverUdpListener struct {
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p *program
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nconn *net.UDPConn
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flow trackFlow
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chanWrite chan *udpWrite
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}
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func newServerUdpListener(p *program, port int, flow trackFlow) (*serverUdpListener, error) {
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nconn, err := net.ListenUDP("udp", &net.UDPAddr{
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Port: port,
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})
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if err != nil {
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return nil, err
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}
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l := &serverUdpListener{
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p: p,
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nconn: nconn,
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flow: flow,
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chanWrite: make(chan *udpWrite),
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}
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l.log("opened on :%d", port)
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return l, nil
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}
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func (l *serverUdpListener) log(format string, args ...interface{}) {
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var label string
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if l.flow == _TRACK_FLOW_RTP {
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label = "RTP"
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} else {
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label = "RTCP"
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}
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log.Printf("[UDP/"+label+" listener] "+format, args...)
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}
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func (l *serverUdpListener) run() {
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go func() {
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for {
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// create a buffer for each read.
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// this is necessary since the buffer is propagated with channels
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// so it must be unique.
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buf := make([]byte, 2048) // UDP MTU is 1400
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n, addr, err := l.nconn.ReadFromUDP(buf)
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if err != nil {
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l.log("ERR: %s", err)
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break
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}
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func() {
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l.p.mutex.RLock()
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defer l.p.mutex.RUnlock()
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// find path and track id from ip and port
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path, trackId := func() (string, int) {
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for _, pub := range l.p.publishers {
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for i, t := range pub.streamTracks {
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if !pub.ip.Equal(addr.IP) {
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continue
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}
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if l.flow == _TRACK_FLOW_RTP {
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if t.rtpPort == addr.Port {
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return pub.path, i
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}
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} else {
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if t.rtcpPort == addr.Port {
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return pub.path, i
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}
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}
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}
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}
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return "", -1
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}()
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if path == "" {
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return
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}
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l.p.forwardTrack(path, trackId, l.flow, buf[:n])
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}()
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}
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}()
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go func() {
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for {
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w := <-l.chanWrite
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l.nconn.SetWriteDeadline(time.Now().Add(_WRITE_TIMEOUT))
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l.nconn.WriteTo(w.buf, w.addr)
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}
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}()
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}
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