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mediaengine.go
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mediaengine.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 rtc
import (
"fmt"
"strings"
"github.com/pion/webrtc/v3"
"golang.org/x/exp/slices"
"github.com/livekit/livekit-server/pkg/sfu"
"github.com/livekit/protocol/livekit"
)
const (
videoRTXMimeType = "video/rtx"
)
var opusCodecCapability = webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeOpus, ClockRate: 48000, Channels: 2, SDPFmtpLine: "minptime=10;useinbandfec=1"}
var redCodecCapability = webrtc.RTPCodecCapability{MimeType: sfu.MimeTypeAudioRed, ClockRate: 48000, Channels: 2, SDPFmtpLine: "111/111"}
var videoRTX = webrtc.RTPCodecCapability{MimeType: videoRTXMimeType, ClockRate: 90000}
func registerCodecs(me *webrtc.MediaEngine, codecs []*livekit.Codec, rtcpFeedback RTCPFeedbackConfig, filterOutH264HighProfile bool) error {
opusCodec := opusCodecCapability
opusCodec.RTCPFeedback = rtcpFeedback.Audio
var opusPayload webrtc.PayloadType
if IsCodecEnabled(codecs, opusCodec) {
opusPayload = 111
if err := me.RegisterCodec(webrtc.RTPCodecParameters{
RTPCodecCapability: opusCodec,
PayloadType: opusPayload,
}, webrtc.RTPCodecTypeAudio); err != nil {
return err
}
if IsCodecEnabled(codecs, redCodecCapability) {
if err := me.RegisterCodec(webrtc.RTPCodecParameters{
RTPCodecCapability: redCodecCapability,
PayloadType: 63,
}, webrtc.RTPCodecTypeAudio); err != nil {
return err
}
}
}
rtxEnabled := IsCodecEnabled(codecs, videoRTX)
h264HighProfileFmtp := "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640032"
for _, codec := range []webrtc.RTPCodecParameters{
{
RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeVP8, ClockRate: 90000, RTCPFeedback: rtcpFeedback.Video},
PayloadType: 96,
},
{
RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeVP9, ClockRate: 90000, SDPFmtpLine: "profile-id=0", RTCPFeedback: rtcpFeedback.Video},
PayloadType: 98,
},
{
RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeVP9, ClockRate: 90000, SDPFmtpLine: "profile-id=1", RTCPFeedback: rtcpFeedback.Video},
PayloadType: 100,
},
{
RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeH264, ClockRate: 90000, SDPFmtpLine: "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f", RTCPFeedback: rtcpFeedback.Video},
PayloadType: 125,
},
{
RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeH264, ClockRate: 90000, SDPFmtpLine: "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f", RTCPFeedback: rtcpFeedback.Video},
PayloadType: 108,
},
{
RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeH264, ClockRate: 90000, SDPFmtpLine: h264HighProfileFmtp, RTCPFeedback: rtcpFeedback.Video},
PayloadType: 123,
},
{
RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeAV1, ClockRate: 90000, RTCPFeedback: rtcpFeedback.Video},
PayloadType: 35,
},
} {
if filterOutH264HighProfile && codec.RTPCodecCapability.SDPFmtpLine == h264HighProfileFmtp {
continue
}
if codec.MimeType == videoRTXMimeType {
continue
}
if IsCodecEnabled(codecs, codec.RTPCodecCapability) {
if err := me.RegisterCodec(codec, webrtc.RTPCodecTypeVideo); err != nil {
return err
}
if rtxEnabled {
if err := me.RegisterCodec(webrtc.RTPCodecParameters{
RTPCodecCapability: webrtc.RTPCodecCapability{
MimeType: videoRTXMimeType,
ClockRate: 90000,
SDPFmtpLine: fmt.Sprintf("apt=%d", codec.PayloadType),
},
PayloadType: codec.PayloadType + 1,
}, webrtc.RTPCodecTypeVideo); err != nil {
return err
}
}
}
}
return nil
}
func registerHeaderExtensions(me *webrtc.MediaEngine, rtpHeaderExtension RTPHeaderExtensionConfig) error {
for _, extension := range rtpHeaderExtension.Video {
if err := me.RegisterHeaderExtension(webrtc.RTPHeaderExtensionCapability{URI: extension}, webrtc.RTPCodecTypeVideo); err != nil {
return err
}
}
for _, extension := range rtpHeaderExtension.Audio {
if err := me.RegisterHeaderExtension(webrtc.RTPHeaderExtensionCapability{URI: extension}, webrtc.RTPCodecTypeAudio); err != nil {
return err
}
}
return nil
}
func createMediaEngine(codecs []*livekit.Codec, config DirectionConfig, filterOutH264HighProfile bool) (*webrtc.MediaEngine, error) {
me := &webrtc.MediaEngine{}
if err := registerCodecs(me, codecs, config.RTCPFeedback, filterOutH264HighProfile); err != nil {
return nil, err
}
if err := registerHeaderExtensions(me, config.RTPHeaderExtension); err != nil {
return nil, err
}
return me, nil
}
func IsCodecEnabled(codecs []*livekit.Codec, cap webrtc.RTPCodecCapability) bool {
for _, codec := range codecs {
if !strings.EqualFold(codec.Mime, cap.MimeType) {
continue
}
if codec.FmtpLine == "" || strings.EqualFold(codec.FmtpLine, cap.SDPFmtpLine) {
return true
}
}
return false
}
func selectAlternativeVideoCodec(enabledCodecs []*livekit.Codec) string {
// sort these by compatibility, since we are looking for backups
if slices.ContainsFunc(enabledCodecs, func(c *livekit.Codec) bool {
return strings.EqualFold(c.Mime, webrtc.MimeTypeVP8)
}) {
return webrtc.MimeTypeVP8
}
if slices.ContainsFunc(enabledCodecs, func(c *livekit.Codec) bool {
return strings.EqualFold(c.Mime, webrtc.MimeTypeH264)
}) {
return webrtc.MimeTypeH264
}
for _, c := range enabledCodecs {
if strings.HasPrefix(c.Mime, "video/") {
return c.Mime
}
}
// no viable codec in the list of enabled codecs, fall back to the most widely supported codec
return webrtc.MimeTypeVP8
}