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translator.go
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translator.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 sdk
import (
"time"
"github.com/pion/rtp"
"github.com/livekit/livekit-server/pkg/sfu/buffer"
"github.com/livekit/livekit-server/pkg/sfu/codecmunger"
"github.com/livekit/protocol/logger"
)
type Translator interface {
Translate(*rtp.Packet)
}
// VP8
type VP8Translator struct {
logger logger.Logger
firstPktPushed bool
lastSN uint16
vp8Munger *codecmunger.VP8
}
func NewVP8Translator(logger logger.Logger) *VP8Translator {
return &VP8Translator{
logger: logger,
vp8Munger: codecmunger.NewVP8(logger),
}
}
func (t *VP8Translator) Translate(pkt *rtp.Packet) {
defer func() {
t.lastSN = pkt.SequenceNumber
}()
if len(pkt.Payload) == 0 {
return
}
vp8Packet := buffer.VP8{}
if err := vp8Packet.Unmarshal(pkt.Payload); err != nil {
t.logger.Warnw("could not unmarshal VP8 packet", err)
return
}
extPkt := &buffer.ExtPacket{
Packet: pkt,
Arrival: time.Now(),
Payload: vp8Packet,
KeyFrame: vp8Packet.IsKeyFrame,
VideoLayer: buffer.VideoLayer{
Spatial: -1,
Temporal: int32(vp8Packet.TID),
},
}
if !t.firstPktPushed {
t.firstPktPushed = true
t.vp8Munger.SetLast(extPkt)
} else {
payload := make([]byte, 1460)
incomingHeaderSize, outgoingHeaderSize, err := t.vp8Munger.UpdateAndGet(extPkt, false, pkt.SequenceNumber != t.lastSN+1, extPkt.Temporal, payload)
if err != nil {
t.logger.Warnw("could not update VP8 packet", err)
return
}
copy(payload[outgoingHeaderSize:], extPkt.Packet.Payload[incomingHeaderSize:])
pkt.Payload = payload[:outgoingHeaderSize+len(extPkt.Packet.Payload)-incomingHeaderSize]
}
}
// Null
type NullTranslator struct{}
func NewNullTranslator() Translator {
return &NullTranslator{}
}
func (t *NullTranslator) Translate(_ *rtp.Packet) {}