/
rtpreader.go
150 lines (134 loc) · 3.05 KB
/
rtpreader.go
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package rtpconn
import (
"io"
"log"
"time"
"github.com/pion/rtp"
"github.com/pion/webrtc/v3"
"github.com/jech/galene/codecs"
"github.com/jech/galene/packetcache"
"github.com/jech/galene/rtptime"
)
func readLoop(track *rtpUpTrack) {
writers := rtpWriterPool{track: track}
defer func() {
writers.close()
close(track.readerDone)
}()
isvideo := track.track.Kind() == webrtc.RTPCodecTypeVideo
codec := track.track.Codec()
sendNACK := track.hasRtcpFb("nack", "")
sendPLI := track.hasRtcpFb("nack", "pli")
var kfNeeded bool
var kfRequested time.Time
buf := make([]byte, packetcache.BufSize)
var packet rtp.Packet
for {
select {
case <-track.actions.Ch:
actions := track.actions.Get()
for _, action := range actions {
switch action.action {
case trackActionAdd, trackActionDel:
err := writers.add(
action.track,
action.action == trackActionAdd,
)
if err != nil {
log.Printf(
"add/remove track: %v",
err,
)
}
case trackActionKeyframe:
kfNeeded = true
default:
log.Printf("Unknown action")
}
}
default:
}
bytes, _, err := track.track.Read(buf)
if err != nil {
if err != io.EOF {
log.Printf("%v", err)
}
break
}
track.rate.Accumulate(uint32(bytes))
err = packet.Unmarshal(buf[:bytes])
if err != nil {
log.Printf("%v", err)
continue
}
track.jitter.Accumulate(packet.Timestamp)
kf, kfKnown := codecs.Keyframe(codec.MimeType, &packet)
if kf || !kfKnown {
kfNeeded = false
}
if packet.Extension {
packet.Extension = false
packet.Extensions = nil
bytes, err = packet.MarshalTo(buf)
if err != nil {
log.Printf("%v", err)
continue
}
}
first, index := track.cache.Store(
packet.SequenceNumber, packet.Timestamp,
kf, packet.Marker, buf[:bytes],
)
_, rate := track.rate.Estimate()
delta := packet.SequenceNumber - first
if (delta & 0x8000) != 0 {
delta = 0
}
// send a NACK if a packet is late by 20ms or 2 packets,
// whichever is more. Since TCP sends a dupack after 2 packets,
// this should be safe.
packets := rate / 50
if packets > 24 {
packets = 24
}
if packets < 2 {
packets = 2
}
// send NACKs for more recent packets, this makes better
// use of the NACK bitmap
unnacked := uint16(4)
if unnacked > uint16(packets) {
unnacked = uint16(packets)
}
if uint32(delta) > packets {
found, first, bitmap := track.cache.BitmapGet(
packet.SequenceNumber - unnacked,
)
if found && sendNACK {
err := track.sendNACK(first, bitmap)
if err != nil {
log.Printf("%v", err)
}
}
}
delay := uint32(rtptime.JiffiesPerSec / 1024)
if rate > 512 {
delay = rtptime.JiffiesPerSec / rate / 2
}
writers.write(packet.SequenceNumber, index, delay,
isvideo, packet.Marker)
now := time.Now()
if kfNeeded && now.Sub(kfRequested) > time.Second/2 {
if sendPLI {
err := track.sendPLI()
if err != nil {
log.Printf("sendPLI: %v", err)
kfNeeded = false
}
} else {
kfNeeded = false
}
kfRequested = now
}
}
}