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Copy pathvideo_remb.go
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90 lines (82 loc) · 2.28 KB
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package kvm
import (
"math"
"sync"
"github.com/pion/interceptor"
"github.com/pion/rtcp"
"github.com/pion/webrtc/v4"
)
// The hardware encoder is shared. Honour the lowest estimate among receivers
// and remove a receiver's limit when its sender closes.
var videoREMB = struct {
sync.Mutex
estimates map[*webrtc.RTPSender]uint32
}{estimates: make(map[*webrtc.RTPSender]uint32)}
func updateVideoREMB(sender *webrtc.RTPSender, bitrate uint32) {
videoREMB.Lock()
defer videoREMB.Unlock()
if bitrate == 0 {
delete(videoREMB.estimates, sender)
} else {
videoREMB.estimates[sender] = bitrate
}
var limit uint32
for _, estimate := range videoREMB.estimates {
if limit == 0 || estimate < limit {
limit = estimate
}
}
if err := nativeInstance.VideoSetREMB(limit); err != nil {
webrtcLogger.Warn().Err(err).Msg("failed to update receiver bitrate limit")
}
}
func receiverVideoBitrate(packet *rtcp.ReceiverEstimatedMaximumBitrate, ssrc uint32) uint32 {
bitrate := float64(packet.Bitrate)
if math.IsNaN(bitrate) || math.IsInf(bitrate, 0) || bitrate < 0 {
return 0
}
for _, source := range packet.SSRCs {
if source == ssrc {
// Zero is a valid receiver estimate; reserve zero internally for reset.
return uint32(max(1, min(bitrate, math.MaxUint32)))
}
}
return 0
}
func readVideoRTCP(sender *webrtc.RTPSender) {
defer updateVideoREMB(sender, 0)
readVideoRTCPPackets(sender, func(packets []rtcp.Packet) {
params := sender.GetParameters()
for _, packet := range packets {
remb, ok := packet.(*rtcp.ReceiverEstimatedMaximumBitrate)
if !ok {
continue
}
for _, encoding := range params.Encodings {
if bitrate := receiverVideoBitrate(remb, uint32(encoding.SSRC)); bitrate != 0 {
updateVideoREMB(sender, bitrate)
break
}
}
}
})
}
type videoRTCPReader interface {
Read([]byte) (int, interceptor.Attributes, error)
}
// Keep read errors separate from packet decoding errors. Invalid RTCP must not
// end draining or clear a receiver's estimate while its sender is still open.
func readVideoRTCPPackets(reader videoRTCPReader, handle func([]rtcp.Packet)) {
buf := make([]byte, 1500)
for {
n, _, err := reader.Read(buf)
if err != nil {
return
}
packets, err := rtcp.Unmarshal(buf[:n])
if err != nil {
continue
}
handle(packets)
}
}