/
base.go
97 lines (79 loc) · 2.09 KB
/
base.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 pacer
import (
"errors"
"io"
"time"
"github.com/livekit/protocol/logger"
"github.com/pion/rtp"
)
type Base struct {
logger logger.Logger
packetTime *PacketTime
}
func NewBase(logger logger.Logger) *Base {
return &Base{
logger: logger,
packetTime: NewPacketTime(),
}
}
func (b *Base) SetInterval(_interval time.Duration) {
}
func (b *Base) SetBitrate(_bitrate int) {
}
func (b *Base) SendPacket(p *Packet) (int, error) {
defer func() {
if p.Pool != nil && p.PoolEntity != nil {
p.Pool.Put(p.PoolEntity)
}
}()
_, err := b.writeRTPHeaderExtensions(p)
if err != nil {
b.logger.Errorw("writing rtp header extensions err", err)
return 0, err
}
var written int
written, err = p.Writer(p.Header, p.Payload)
if err != nil {
if !errors.Is(err, io.ErrClosedPipe) {
b.logger.Errorw("write rtp packet failed", err)
}
return 0, err
}
return written, nil
}
// writes RTP header extensions of track
func (b *Base) writeRTPHeaderExtensions(p *Packet) (time.Time, error) {
for _, ext := range p.Extensions {
if ext.ID == 0 || len(ext.Payload) == 0 {
continue
}
p.Header.SetExtension(ext.ID, ext.Payload)
}
sendingAt := b.packetTime.Get()
if p.AbsSendTimeExtID != 0 {
sendTime := rtp.NewAbsSendTimeExtension(sendingAt)
b, err := sendTime.Marshal()
if err != nil {
return time.Time{}, err
}
err = p.Header.SetExtension(p.AbsSendTimeExtID, b)
if err != nil {
return time.Time{}, err
}
}
return sendingAt, nil
}
// ------------------------------------------------