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Clean up keyframe handling in rtpwriter.
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parent
6c6b0b39c9
commit
aae6b460f7
1 changed files with 33 additions and 16 deletions
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@ -230,6 +230,13 @@ func sendKeyframe(kf []uint16, track conn.DownTrack, cache *packetcache.Cache) {
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}
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}
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const (
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kfUnneeded = iota
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kfNeededPLI
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kfNeededFIR
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kfNeededNewFIR
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)
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// rtpWriterLoop is the main loop of an rtpWriter.
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func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
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defer close(writer.done)
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@ -241,9 +248,7 @@ func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
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local := make([]conn.DownTrack, 0)
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// 3 means we want a new keyframe, 2 means we already sent FIR but
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// haven't gotten a keyframe yet, 1 means we want a PLI.
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kfNeeded := 0
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kfNeeded := kfUnneeded
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for {
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select {
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@ -283,7 +288,7 @@ func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
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)
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} else {
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// Request a new keyframe
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kfNeeded = 3
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kfNeeded = kfNeededNewFIR
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}
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} else {
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// no keyframe yet, one should
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@ -328,7 +333,7 @@ func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
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err := l.WriteRTP(&packet)
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if err != nil {
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if err == conn.ErrKeyframeNeeded {
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kfNeeded = 1
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kfNeeded = kfNeededPLI
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} else {
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continue
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}
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@ -336,27 +341,39 @@ func rtpWriterLoop(writer *rtpWriter, up *rtpUpConnection, track *rtpUpTrack) {
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l.Accumulate(uint32(bytes))
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}
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if kfNeeded > 0 {
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if kfNeeded > kfUnneeded {
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kf := false
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kfValid := false
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switch codec {
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case webrtc.VP8:
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kf = isVP8Keyframe(&packet)
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default:
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kf = true
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kfValid = true
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}
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if kf {
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kfNeeded = 0
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kfNeeded = kfUnneeded
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}
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}
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if kfNeeded >= 2 {
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err := up.sendFIR(track, kfNeeded >= 3)
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if err == ErrUnsupportedFeedback {
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if kfNeeded >= kfNeededFIR {
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err := up.sendFIR(
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track,
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kfNeeded >= kfNeededNewFIR,
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)
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if err == ErrUnsupportedFeedback {
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kfNeeded = kfNeededPLI
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} else {
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kfNeeded = kfNeededFIR
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}
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}
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if kfNeeded == kfNeededPLI {
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up.sendPLI(track)
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}
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kfNeeded = 2
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} else if kfNeeded > 0 {
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up.sendPLI(track)
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if !kfValid {
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// we cannot detect keyframes for
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// this codec, reset our state
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kfNeeded = kfUnneeded
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}
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}
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}
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}
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