Storm Dragon
123 lines
2.4 KiB
Go
123 lines
2.4 KiB
Go
package rtpconn
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import (
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"io"
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"log"
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"github.com/pion/rtp"
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"git.stormux.org/storm/skald/packetcache"
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"git.stormux.org/storm/skald/rtptime"
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)
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func readLoop(track *rtpUpTrack) {
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writers := rtpWriterPool{track: track}
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defer func() {
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writers.close()
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close(track.readerDone)
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}()
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sendNACK := track.hasRtcpFb("nack", "")
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buf := make([]byte, packetcache.BufSize)
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var packet rtp.Packet
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for {
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select {
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case <-track.actions.Ch:
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actions := track.actions.Get()
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for _, action := range actions {
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switch action.action {
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case trackActionAdd, trackActionDel:
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err := writers.add(
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action.track,
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action.action == trackActionAdd,
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)
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if err != nil {
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log.Printf(
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"add/remove track: %v",
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err,
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)
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}
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default:
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log.Printf("Unknown action")
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}
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}
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default:
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}
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bytes, _, err := track.track.Read(buf)
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if err != nil {
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if err != io.EOF {
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log.Printf("%v", err)
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}
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break
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}
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track.rate.Accumulate(uint32(bytes))
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err = packet.Unmarshal(buf[:bytes])
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if err != nil {
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log.Printf("%v", err)
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continue
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}
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track.jitter.Accumulate(packet.Timestamp)
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if packet.Extension {
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packet.Extension = false
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packet.Extensions = nil
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bytes, err = packet.MarshalTo(buf)
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if err != nil {
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log.Printf("%v", err)
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continue
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}
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}
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first, index := track.cache.Store(
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packet.SequenceNumber, packet.Timestamp,
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false, packet.Marker, buf[:bytes],
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)
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_, rate := track.rate.Estimate()
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delta := packet.SequenceNumber - first
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if (delta & 0x8000) != 0 {
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delta = 0
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}
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// send a NACK if a packet is late by 20ms or 2 packets,
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// whichever is more. Since TCP sends a dupack after 2 packets,
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// this should be safe.
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packets := rate / 50
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if packets > 24 {
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packets = 24
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}
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if packets < 2 {
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packets = 2
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}
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// send NACKs for more recent packets, this makes better
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// use of the NACK bitmap
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unnacked := uint16(4)
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if unnacked > uint16(packets) {
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unnacked = uint16(packets)
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}
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if uint32(delta) > packets {
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found, first, bitmap := track.cache.BitmapGet(
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packet.SequenceNumber - unnacked,
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)
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if found && sendNACK {
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err := track.sendNACK(first, bitmap)
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if err != nil {
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log.Printf("%v", err)
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}
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}
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}
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delay := uint32(rtptime.JiffiesPerSec / 1024)
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if rate > 512 {
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delay = rtptime.JiffiesPerSec / rate / 2
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}
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writers.write(packet.SequenceNumber, index, delay,
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packet.Marker)
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}
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}
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