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Move keyframe handling to the sender side.

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This is simpler and gets rid of ErrKeyframeNeeded.
This commit is contained in:
Juliusz Chroboczek 2021-05-11 22:36:56 +02:00
parent b2ea8e8533
commit c52e1f4ce0
5 changed files with 59 additions and 108 deletions
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2
conn/conn.go
View file

@ -9,7 +9,6 @@ import (
)
var ErrConnectionClosed = errors.New("connection is closed")
var ErrKeyframeNeeded = errors.New("keyframe needed")
// Type Up represents a connection in the client to server direction.
type Up interface {
@ -30,6 +29,7 @@ type UpTrack interface {
// get a recent packet. Returns 0 if the packet is not in cache.
GetRTP(seqno uint16, result []byte) uint16
Nack(conn Up, seqnos []uint16) error
RequestKeyframe() error
}
// Type Down represents a connection in the server to client direction.

4
diskwriter/diskwriter.go
View file

@ -458,7 +458,7 @@ func (t *diskTrack) WriteRTP(packet *rtp.Packet) error {
sample, ts := t.builder.PopWithTimestamp()
if sample == nil {
if kfNeeded {
return conn.ErrKeyframeNeeded
t.remote.RequestKeyframe()
}
return nil
}
@ -506,7 +506,7 @@ func (t *diskTrack) WriteRTP(packet *rtp.Packet) error {
if t.writer == nil {
if !keyframe {
return conn.ErrKeyframeNeeded
t.remote.RequestKeyframe()
}
return nil
}

74
rtpconn/rtpconn.go
View file

@ -171,9 +171,9 @@ func newDownConn(c group.Client, id string, remote conn.Up) (*rtpDownConnection,
})
conn := &rtpDownConnection{
id: id,
pc: pc,
remote: remote,
id: id,
pc: pc,
remote: remote,
}
return conn, nil
@ -235,7 +235,7 @@ type rtpUpTrack struct {
atomics *upTrackAtomics
cname atomic.Value
localCh chan localTrackAction
localCh chan trackAction
readerDone chan struct{}
mu sync.Mutex
@ -246,14 +246,20 @@ type rtpUpTrack struct {
bufferedNACKs []uint16
}
type localTrackAction struct {
add bool
track conn.DownTrack
const (
trackActionAdd = iota
trackActionDel
trackActionKeyframe
)
type trackAction struct {
action int
track conn.DownTrack
}
func (up *rtpUpTrack) notifyLocal(add bool, track conn.DownTrack) {
func (up *rtpUpTrack) action(action int, track conn.DownTrack) {
select {
case up.localCh <- localTrackAction{add, track}:
case up.localCh <- trackAction{action, track}:
case <-up.readerDone:
}
}
@ -271,7 +277,12 @@ func (up *rtpUpTrack) AddLocal(local conn.DownTrack) error {
// do this asynchronously, to avoid deadlocks when multiple
// clients call this simultaneously.
go up.notifyLocal(true, local)
go up.action(trackActionAdd, local)
return nil
}
func (up *rtpUpTrack) RequestKeyframe() error {
go up.action(trackActionKeyframe, nil)
return nil
}
@ -283,7 +294,7 @@ func (up *rtpUpTrack) DelLocal(local conn.DownTrack) bool {
up.local = append(up.local[:i], up.local[i+1:]...)
// do this asynchronously, to avoid deadlocking when
// multiple clients call this simultaneously.
go up.notifyLocal(false, l)
go up.action(trackActionDel, l)
return true
}
}
@ -489,7 +500,7 @@ func newUpConn(c group.Client, id string, label string, offer string) (*rtpUpCon
rate: estimator.New(time.Second),
jitter: jitter.New(remote.Codec().ClockRate),
atomics: &upTrackAtomics{},
localCh: make(chan localTrackAction, 2),
localCh: make(chan trackAction, 2),
readerDone: make(chan struct{}),
}
@ -977,7 +988,6 @@ func (track *rtpDownTrack) updateRate(loss uint8, now uint64) {
}
func rtcpDownListener(conn *rtpDownConnection, track *rtpDownTrack, s *webrtc.RTPSender) {
var gotFir bool
lastFirSeqno := uint8(0)
buf := make([]byte, 1500)
@ -1001,18 +1011,7 @@ func rtcpDownListener(conn *rtpDownConnection, track *rtpDownTrack, s *webrtc.RT
for _, p := range ps {
switch p := p.(type) {
case *rtcp.PictureLossIndication:
remote, ok := conn.remote.(*rtpUpConnection)
if !ok {
continue
}
rt, ok := track.remote.(*rtpUpTrack)
if !ok {
continue
}
err := remote.sendPLI(rt)
if err != nil && err != ErrRateLimited {
log.Printf("sendPLI: %v", err)
}
track.remote.RequestKeyframe()
case *rtcp.FullIntraRequest:
found := false
var seqno uint8
@ -1028,29 +1027,8 @@ func rtcpDownListener(conn *rtpDownConnection, track *rtpDownTrack, s *webrtc.RT
continue
}
increment := true
if gotFir {
increment = seqno != lastFirSeqno
}
gotFir = true
lastFirSeqno = seqno
remote, ok := conn.remote.(*rtpUpConnection)
if !ok {
continue
}
rt, ok := track.remote.(*rtpUpTrack)
if !ok {
continue
}
err := remote.sendFIR(rt, increment)
if err == ErrUnsupportedFeedback {
err := remote.sendPLI(rt)
if err != nil && err != ErrRateLimited {
log.Printf("sendPLI: %v", err)
}
} else if err != nil && err != ErrRateLimited {
log.Printf("sendFIR: %v", err)
if seqno != lastFirSeqno {
track.remote.RequestKeyframe()
}
case *rtcp.ReceiverEstimatedMaximumBitrate:
track.maxREMBBitrate.Set(p.Bitrate, jiffies)

31
rtpconn/rtpreader.go
View file

@ -21,6 +21,7 @@ func readLoop(conn *rtpUpConnection, track *rtpUpTrack) {
isvideo := track.track.Kind() == webrtc.RTPCodecTypeVideo
codec := track.track.Codec()
sendNACK := track.hasRtcpFb("nack", "")
var kfNeeded bool
buf := make([]byte, packetcache.BufSize)
var packet rtp.Packet
for {
@ -41,8 +42,10 @@ func readLoop(conn *rtpUpConnection, track *rtpUpTrack) {
track.jitter.Accumulate(packet.Timestamp)
kf, _ := isKeyframe(codec.MimeType, &packet)
kf, kfKnown := isKeyframe(codec.MimeType, &packet)
if kf || !kfKnown {
kfNeeded = false
}
if packet.Extension {
packet.Extension = false
packet.Extensions = nil
@ -102,11 +105,29 @@ func readLoop(conn *rtpUpConnection, track *rtpUpTrack) {
select {
case action := <-track.localCh:
err := writers.add(action.track, action.add)
if err != nil {
log.Printf("add/remove track: %v", err)
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 %v", action.action)
}
default:
}
if kfNeeded {
err := conn.sendPLI(track)
if err != nil && err != ErrRateLimited {
log.Printf("sendPLI: %v", err)
kfNeeded = false
}
}
}
}

56
rtpconn/rtpwriter.go
View file

@ -4,7 +4,6 @@ import (
"errors"
"log"
"sort"
"strings"
"time"
"github.com/pion/rtp"
@ -223,33 +222,22 @@ func sendKeyframe(kf []uint16, track conn.DownTrack, cache *packetcache.Cache) {
return
}
err = track.WriteRTP(&packet)
if err != nil && err != conn.ErrKeyframeNeeded {
if err != nil {
return
}
track.Accumulate(uint32(bytes))
}
}
const (
kfUnneeded = iota
kfNeededPLI
kfNeededFIR
kfNeededNewFIR
)
// rtpWriterLoop is the main loop of an rtpWriter.
func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
defer close(writer.done)
codec := track.track.Codec()
buf := make([]byte, packetcache.BufSize)
var packet rtp.Packet
local := make([]conn.DownTrack, 0)
kfNeeded := kfUnneeded
for {
select {
case action := <-writer.action:
@ -277,8 +265,7 @@ func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
found, _, lts := track.cache.Last()
kts, _, kf := track.cache.Keyframe()
if strings.ToLower(codec.MimeType) == "video/vp8" &&
found && len(kf) > 0 {
if found && len(kf) > 0 {
if ((lts-kts)&0x80000000) != 0 ||
lts-kts < 2*90000 {
// we got a recent keyframe
@ -288,8 +275,7 @@ func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
track.cache,
)
} else {
// Request a new keyframe
kfNeeded = kfNeededNewFIR
track.RequestKeyframe()
}
} else {
// no keyframe yet, one should
@ -333,44 +319,10 @@ func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
for _, l := range local {
err := l.WriteRTP(&packet)
if err != nil {
if err == conn.ErrKeyframeNeeded {
kfNeeded = kfNeededPLI
} else {
continue
}
continue
}
l.Accumulate(uint32(bytes))
}
if kfNeeded > kfUnneeded {
kf, kfKnown :=
isKeyframe(codec.MimeType, &packet)
if kf {
kfNeeded = kfUnneeded
}
if kfNeeded >= kfNeededFIR {
err := up.sendFIR(
track,
kfNeeded >= kfNeededNewFIR,
)
if err == ErrUnsupportedFeedback {
kfNeeded = kfNeededPLI
} else {
kfNeeded = kfNeededFIR
}
}
if kfNeeded == kfNeededPLI {
up.sendPLI(track)
}
if !kfKnown {
// we cannot detect keyframes for
// this codec, reset our state
kfNeeded = kfUnneeded
}
}
}
}
}