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Make packetcache.Get use a caller-allocated buffer.

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This commit is contained in:
Juliusz Chroboczek 2020-05-20 20:32:30 +02:00
parent a6ff98a313
commit f641e263f1
3 changed files with 26 additions and 16 deletions
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9
client.go
View file

@ -855,13 +855,14 @@ func sendNACK(pc *webrtc.PeerConnection, ssrc uint32, first uint16, bitmap uint1
func sendRecovery(p *rtcp.TransportLayerNack, track *downTrack) {
var packet rtp.Packet
buf := make([]byte, packetcache.BufSize)
for _, nack := range p.Nacks {
for _, seqno := range nack.PacketList() {
raw := track.remote.cache.Get(seqno)
if raw == nil {
l := track.remote.cache.Get(seqno, buf)
if l == 0 {
continue
}
err := packet.Unmarshal(raw)
err := packet.Unmarshal(buf[:l])
if err != nil {
continue
}
@ -870,7 +871,7 @@ func sendRecovery(p *rtcp.TransportLayerNack, track *downTrack) {
log.Printf("%v", err)
continue
}
track.rate.Add(uint32(len(raw)))
track.rate.Add(uint32(l))
}
}
}

11
packetcache/packetcache.go
View file

@ -115,7 +115,7 @@ func (cache *Cache) Expect(n int) {
cache.expected += uint32(n)
}
func (cache *Cache) Get(seqno uint16) []byte {
func (cache *Cache) Get(seqno uint16, result []byte) uint16 {
cache.mu.Lock()
defer cache.mu.Unlock()
@ -124,11 +124,12 @@ func (cache *Cache) Get(seqno uint16) []byte {
cache.entries[i].seqno != seqno {
continue
}
buf := make([]byte, cache.entries[i].length)
copy(buf, cache.entries[i].buf[:])
return buf
return uint16(copy(
result[:cache.entries[i].length],
cache.entries[i].buf[:]),
)
}
return nil
return 0
}
// Shift 17 bits out of the bitmap. Return a boolean indicating if any

22
packetcache/packetcache_test.go
View file

@ -23,13 +23,20 @@ func TestCache(t *testing.T) {
cache.Store(13, buf1)
cache.Store(17, buf2)
if bytes.Compare(cache.Get(13), buf1) != 0 {
buf := make([]byte, BufSize)
l := cache.Get(13, buf)
if bytes.Compare(buf[:l], buf1) != 0 {
t.Errorf("Couldn't get 13")
}
if bytes.Compare(cache.Get(17), buf2) != 0 {
l = cache.Get(17, buf)
if bytes.Compare(buf[:l], buf2) != 0 {
t.Errorf("Couldn't get 17")
}
if cache.Get(42) != nil {
l = cache.Get(42, buf)
if l != 0 {
t.Errorf("Creation ex nihilo")
}
}
@ -42,14 +49,15 @@ func TestCacheOverflow(t *testing.T) {
}
for i := 0; i < 32; i++ {
buf := cache.Get(uint16(i))
buf := make([]byte, BufSize)
l := cache.Get(uint16(i), buf)
if i < 16 {
if buf != nil {
if l > 0 {
t.Errorf("Creation ex nihilo: %v", i)
}
} else {
if len(buf) != 1 || buf[0] != uint8(i) {
t.Errorf("Expected [%v], got %v", i, buf)
if l != 1 || buf[0] != uint8(i) {
t.Errorf("Expected [%v], got %v", i, buf[:l])
}
}
}