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Discard old keyframes.

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Avoids seqno wraparound.  Unlikely, but I'm supersticious.
This commit is contained in:
Juliusz Chroboczek 2020-10-06 05:02:58 +02:00
parent 0eb1593bb8
commit 86f7594626
1 changed files with 8 additions and 0 deletions
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8
packetcache/packetcache.go
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@ -137,6 +137,10 @@ func (frame *frame) store(seqno uint16, timestamp uint32, first bool, data []byt
} }
} else if len(frame.entries) > 0 { } else if len(frame.entries) > 0 {
if frame.timestamp != timestamp { if frame.timestamp != timestamp {
delta := seqno - frame.entries[0].seqno
if (delta & 0x8000) == 0 && delta > 0x4000 {
frame.entries = frame.entries[:0]
}
return return
} }
} else { } else {
@ -271,6 +275,10 @@ func (cache *Cache) Keyframe() (uint32, []uint16) {
cache.mu.Lock() cache.mu.Lock()
defer cache.mu.Unlock() defer cache.mu.Unlock()
if len(cache.keyframe.entries) == 0 {
return 0, nil
}
seqnos := make([]uint16, len(cache.keyframe.entries)) seqnos := make([]uint16, len(cache.keyframe.entries))
for i := range cache.keyframe.entries { for i := range cache.keyframe.entries {
seqnos[i] = cache.keyframe.entries[i].seqno seqnos[i] = cache.keyframe.entries[i].seqno