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Take next packet index into account when sending NACKs.
This avoids sending NACKs for packets in the future.
This commit is contained in:
parent
67a821ea75
commit
4a8e48d146
3 changed files with 38 additions and 21 deletions
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@ -1,6 +1,7 @@
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package packetcache
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import (
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"math/bits"
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"sync"
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)
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@ -23,8 +24,9 @@ type Cache struct {
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lost uint32
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totalLost uint32
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// bitmap
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first uint16
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bitmap uint32
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bitmapValid bool
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first uint16
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bitmap uint32
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// buffered keyframe
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kfTimestamp uint32
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kfEntries []entry
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@ -56,9 +58,10 @@ func seqnoInvalid(seqno, reference uint16) bool {
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// Set a bit in the bitmap, shifting first if necessary.
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func (cache *Cache) set(seqno uint16) {
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if cache.bitmap == 0 || seqnoInvalid(seqno, cache.first) {
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if !cache.bitmapValid || seqnoInvalid(seqno, cache.first) {
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cache.first = seqno
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cache.bitmap = 1
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cache.bitmapValid = true
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return
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}
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@ -66,14 +69,18 @@ func (cache *Cache) set(seqno uint16) {
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return
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}
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if seqno-cache.first < 32 {
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cache.bitmap |= (1 << uint16(seqno-cache.first))
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return
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if seqno-cache.first >= 32 {
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shift := seqno - cache.first - 31
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cache.bitmap >>= shift
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cache.first += shift
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}
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if (cache.bitmap & 1) == 1 {
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ones := bits.TrailingZeros32(^cache.bitmap)
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cache.bitmap >>= ones
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cache.first += uint16(ones)
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}
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shift := seqno - cache.first - 31
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cache.bitmap >>= shift
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cache.first += shift
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cache.bitmap |= (1 << uint16(seqno-cache.first))
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return
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}
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@ -262,25 +269,34 @@ func (cache *Cache) ResizeCond(capacity int) bool {
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return true
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}
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// Shift 17 bits out of the bitmap. Return a boolean indicating if any
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// were 0, the index of the first 0 bit, and a bitmap indicating any
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// Shift up to 17 bits out of the bitmap. Return a boolean indicating if
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// any were 0, the index of the first 0 bit, and a bitmap indicating any
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// 0 bits after the first one.
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func (cache *Cache) BitmapGet() (bool, uint16, uint16) {
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func (cache *Cache) BitmapGet(next uint16) (bool, uint16, uint16) {
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cache.mu.Lock()
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defer cache.mu.Unlock()
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first := cache.first
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bitmap := (^cache.bitmap) & 0x1FFFF
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cache.bitmap >>= 17
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cache.first += 17
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count := next - first
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if (count&0x8000) != 0 || count == 0 {
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// next is in the past
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return false, first, 0
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}
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if count > 17 {
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count = 17
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}
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bitmap := (^cache.bitmap) & ^((^uint32(0)) << count)
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cache.bitmap >>= count
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cache.first += count
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if bitmap == 0 {
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return false, first, 0
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}
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for bitmap&1 == 0 {
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bitmap >>= 1
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first++
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if (bitmap & 1) == 0 {
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count := bits.TrailingZeros32(bitmap)
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bitmap >>= count
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first += uint16(count)
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}
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return true, first, uint16(bitmap >> 1)
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@ -264,7 +264,7 @@ func TestBitmapGet(t *testing.T) {
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pos := uint16(42)
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for cache.bitmap != 0 {
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found, first, bitmap := cache.BitmapGet()
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found, first, bitmap := cache.BitmapGet(42 + 65)
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if first < pos || first >= pos+64 {
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t.Errorf("First is %v, pos is %v", first, pos)
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}
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@ -304,7 +304,7 @@ func TestBitmapPacket(t *testing.T) {
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}
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}
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found, first, bitmap := cache.BitmapGet()
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found, first, bitmap := cache.BitmapGet(42 + 65)
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if !found {
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t.Fatalf("Didn't find any 0 bits")
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@ -61,7 +61,8 @@ func readLoop(conn *rtpUpConnection, track *rtpUpTrack) {
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packet.SequenceNumber, packet.Timestamp, kf, buf[:bytes],
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)
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if packet.SequenceNumber-first > 24 {
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found, first, bitmap := track.cache.BitmapGet()
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found, first, bitmap :=
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track.cache.BitmapGet(packet.SequenceNumber - 4)
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if found {
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err := conn.sendNACK(track, first, bitmap)
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if err != nil {
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