Fix TotalLost value in receiver reports.

client.go

@@ -395,7 +395,7 @@ func sendRR(c *client, conn *upConnection) error {
 
 	reports := make([]rtcp.ReceptionReport, 0, len(conn.tracks))
 	for _, t := range conn.tracks {
-		expected, lost, eseqno := t.cache.GetStats(true)
+		expected, lost, totalLost, eseqno := t.cache.GetStats(true)
 		if expected == 0 {
 			expected = 1
 		}
@@ -406,7 +406,7 @@ func sendRR(c *client, conn *upConnection) error {
 			SSRC:               t.track.SSRC(),
 			LastSenderReport:   atomic.LoadUint32(&t.lastSenderReport),
 			FractionLost:       uint8((lost * 256) / expected),
-			TotalLost:          lost,
+			TotalLost:          totalLost,
 			LastSequenceNumber: eseqno,
 		})
 	}

group.go

@@ -698,7 +698,7 @@ func getClientStats(c *client) clientStats {
 	for _, up := range c.up {
 		conns := connStats{id: up.id}
 		for _, t := range up.tracks {
-			expected, lost, _ := t.cache.GetStats(false)
+			expected, lost, _, _ := t.cache.GetStats(false)
 			if expected == 0 {
 				expected = 1
 			}

packetcache/packetcache.go

@@ -20,6 +20,7 @@ type Cache struct {
 	lastValid bool
 	expected  uint32
 	lost      uint32
+	totalLost uint32
 	// bitmap
 	first  uint16
 	bitmap uint32
@@ -151,17 +152,19 @@ func (cache *Cache) BitmapGet() (uint16, uint16) {
 	return first, bitmap
 }
 
-func (cache *Cache) GetStats(reset bool) (uint32, uint32, uint32) {
+func (cache *Cache) GetStats(reset bool) (uint32, uint32, uint32, uint32) {
 	cache.mu.Lock()
 	defer cache.mu.Unlock()
 
 	expected := cache.expected
 	lost := cache.lost
+	totalLost := cache.totalLost + cache.lost
 	eseqno := uint32(cache.cycle)<<16 | uint32(cache.last)
 
 	if reset {
 		cache.expected = 0
+		cache.totalLost += cache.lost
 		cache.lost = 0
 	}
-	return expected, lost, eseqno
+	return expected, lost, totalLost, eseqno
 }