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downtrackspreader.go
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downtrackspreader.go
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// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sfu
import (
"sync"
"github.com/livekit/protocol/livekit"
"github.com/livekit/protocol/logger"
"github.com/livekit/protocol/utils"
)
type DownTrackSpreaderParams struct {
Threshold int
Logger logger.Logger
}
type DownTrackSpreader struct {
params DownTrackSpreaderParams
downTrackMu sync.RWMutex
downTracks map[livekit.ParticipantID]TrackSender
downTracksShadow []TrackSender
}
func NewDownTrackSpreader(params DownTrackSpreaderParams) *DownTrackSpreader {
d := &DownTrackSpreader{
params: params,
downTracks: make(map[livekit.ParticipantID]TrackSender),
}
return d
}
func (d *DownTrackSpreader) GetDownTracks() []TrackSender {
d.downTrackMu.RLock()
defer d.downTrackMu.RUnlock()
return d.downTracksShadow
}
func (d *DownTrackSpreader) ResetAndGetDownTracks() []TrackSender {
d.downTrackMu.Lock()
defer d.downTrackMu.Unlock()
downTracks := d.downTracksShadow
d.downTracks = make(map[livekit.ParticipantID]TrackSender)
d.downTracksShadow = nil
return downTracks
}
func (d *DownTrackSpreader) Store(ts TrackSender) {
d.downTrackMu.Lock()
defer d.downTrackMu.Unlock()
d.downTracks[ts.SubscriberID()] = ts
d.shadowDownTracks()
}
func (d *DownTrackSpreader) Free(subscriberID livekit.ParticipantID) {
d.downTrackMu.Lock()
defer d.downTrackMu.Unlock()
delete(d.downTracks, subscriberID)
d.shadowDownTracks()
}
func (d *DownTrackSpreader) HasDownTrack(subscriberID livekit.ParticipantID) bool {
d.downTrackMu.RLock()
defer d.downTrackMu.RUnlock()
_, ok := d.downTracks[subscriberID]
return ok
}
func (d *DownTrackSpreader) Broadcast(writer func(TrackSender)) {
downTracks := d.GetDownTracks()
threshold := uint64(d.params.Threshold)
if threshold == 0 {
threshold = 1000000
}
// 100µs is enough to amortize the overhead and provide sufficient load balancing.
// WriteRTP takes about 50µs on average, so we write to 2 down tracks per loop.
step := uint64(2)
utils.ParallelExec(downTracks, threshold, step, func(dt TrackSender) {
writer(dt)
})
}
func (d *DownTrackSpreader) DownTrackCount() int {
d.downTrackMu.RLock()
defer d.downTrackMu.RUnlock()
return len(d.downTracksShadow)
}
func (d *DownTrackSpreader) shadowDownTracks() {
d.downTracksShadow = make([]TrackSender, 0, len(d.downTracks))
for _, dt := range d.downTracks {
d.downTracksShadow = append(d.downTracksShadow, dt)
}
}