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engine.go
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engine.go
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package rtp
import (
"context"
"fmt"
"github.com/google/uuid"
"github.com/pion/interceptor"
"github.com/pion/interceptor/pkg/intervalpli"
"github.com/pion/interceptor/pkg/stats"
"github.com/pion/webrtc/v3"
"github.com/shigde/sfu/internal/static"
"golang.org/x/exp/slog"
)
type Engine struct {
config webrtc.Configuration
}
func NewEngine(rtpConfig *RtpConfig) (*Engine, error) {
config := rtpConfig.getWebrtcConf()
return &Engine{
config: config,
}, nil
}
func (e *Engine) createApi(apiOptions ...engineApiOption) (*engineApi, error) {
api := &engineApi{}
for _, o := range apiOptions {
o(api)
}
m := &webrtc.MediaEngine{}
if err := m.RegisterDefaultCodecs(); err != nil {
return nil, fmt.Errorf("register default codecs: %w ", err)
}
var statsInterceptorFactory *stats.InterceptorFactory
var err error
if api.onStatsGetter != nil {
if statsInterceptorFactory, err = stats.NewInterceptor(); err != nil {
return nil, fmt.Errorf("create stats interceptor factory: %w", err)
}
statsInterceptorFactory.OnNewPeerConnection(func(_ string, getter stats.Getter) {
api.onStatsGetter(getter)
})
}
// Create a InterceptorRegistry. This is the user configurable RTP/RTCP Pipeline.
// This provides NACKs, RTCP Reports and other features. If you use `webrtc.NewPeerConnection`
// this is enabled by default. If you are manually managing You MUST create a InterceptorRegistry
// for each PeerConnection.
i := &interceptor.Registry{}
// Use the default set of Interceptors
if err := webrtc.RegisterDefaultInterceptors(m, i); err != nil {
return nil, fmt.Errorf("register default interceptors: %w ", err)
}
// Register a intervalpli factory
// This interceptor sends a PLI every 3 seconds. A PLI causes a video keyframe to be generated by the sender.
// This makes our video seekable and more error resilent, but at a cost of lower picture quality and higher bitrates
// A real world application should process incoming RTCP packets from viewers and forward them to senders
intervalPliFactory, err := intervalpli.NewReceiverInterceptor()
if err != nil {
return nil, fmt.Errorf("create interval Pli factory: %w ", err)
}
i.Add(intervalPliFactory)
if statsInterceptorFactory != nil {
i.Add(statsInterceptorFactory)
}
api.API = webrtc.NewAPI(webrtc.WithMediaEngine(m), webrtc.WithInterceptorRegistry(i))
return api, nil
}
func (e *Engine) EstablishEndpoint(ctx context.Context, sessionCtx context.Context, sessionId uuid.UUID, liveStream uuid.UUID, offer webrtc.SessionDescription, endpointType EndpointType, options ...EndpointOption) (*Endpoint, error) {
return EstablishEndpoint(ctx, sessionCtx, e, sessionId, liveStream, offer, endpointType, options...)
}
func (e *Engine) OfferEndpoint(ctx context.Context, sessionCtx context.Context, sessionId uuid.UUID, liveStream uuid.UUID, endpointType EndpointType, options ...EndpointOption) (*Endpoint, error) {
return nil, nil
}
func creatDC(pc *webrtc.PeerConnection, onChannel func(dc *webrtc.DataChannel)) error {
ordered := false
maxRetransmits := uint16(0)
options := &webrtc.DataChannelInit{
Ordered: &ordered,
MaxRetransmits: &maxRetransmits,
}
// Create a datachannel with label 'data'
dc, err := pc.CreateDataChannel("data", options)
if err != nil {
return fmt.Errorf("creating data channel: %w", err)
}
onChannel(dc)
return nil
}
// Deprecated API
// EstablishIngressEndpoint
// Deprecated: Because the Endpoint API is getting simpler
func (e *Engine) EstablishIngressEndpoint(ctx context.Context, sessionId uuid.UUID, liveStream uuid.UUID, offer webrtc.SessionDescription, options ...EndpointOption) (*Endpoint, error) {
return EstablishIngressEndpoint(ctx, e, sessionId, liveStream, offer, options...)
}
// EstablishEgressEndpoint
// Deprecated: Because the Endpoint API is getting simpler
func (e *Engine) EstablishEgressEndpoint(ctx context.Context, sessionId uuid.UUID, liveStream uuid.UUID, options ...EndpointOption) (*Endpoint, error) {
return EstablishEgressEndpoint(ctx, e, sessionId, liveStream, options...)
}
// EstablishStaticEgressEndpoint
// Deprecated: Because the Endpoint API is getting simpler
func (e *Engine) EstablishStaticEgressEndpoint(ctx context.Context, sessionId uuid.UUID, liveStream uuid.UUID, offer webrtc.SessionDescription, options ...EndpointOption) (*Endpoint, error) {
return EstablishStaticEgressEndpoint(ctx, e, sessionId, liveStream, offer, options...)
}
// NewStaticMediaSenderEndpoint can be used to send static streams from file in a lobby.
// Deprecated: Because the Endpoint API is getting simpler
func (e *Engine) NewStaticMediaSenderEndpoint(media *static.MediaFile) (*Endpoint, error) {
stateHandler := newMediaStateEventHandler()
api, err := e.createApi()
if err != nil {
return nil, fmt.Errorf("creating api: %w", err)
}
peerConnection, err := api.NewPeerConnection(e.config)
if err != nil {
return nil, fmt.Errorf("create receiver peer connection: %w ", err)
}
iceConnectedCtx, iceConnectedCtxCancel := context.WithCancel(context.Background())
peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
slog.Debug("rtp.engine: connection State has changed", "state", connectionState.String())
if connectionState == webrtc.ICEConnectionStateConnected {
iceConnectedCtxCancel()
}
})
rtpVideoSender, err := peerConnection.AddTrack(media.VideoTrack)
if err != nil {
return nil, fmt.Errorf("add video track to peer connection: %w ", err)
}
media.PlayVideo(iceConnectedCtx, rtpVideoSender)
rtpAudioSender, err := peerConnection.AddTrack(media.AudioTrack)
if err != nil {
return nil, fmt.Errorf("add audio track to peer connection: %w ", err)
}
media.PlayAudio(iceConnectedCtx, rtpAudioSender)
err = creatDC(peerConnection, stateHandler.OnChannel)
if err != nil {
return nil, fmt.Errorf("creating data channel: %w", err)
}
offer, err := peerConnection.CreateOffer(nil)
if err != nil {
return nil, fmt.Errorf("creating offer: %w", err)
}
gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
if err = peerConnection.SetLocalDescription(offer); err != nil {
return nil, err
}
return &Endpoint{peerConnection: peerConnection, gatherComplete: gatherComplete}, nil
}
// NewSignalConnection can be used to listen on lobby events.
// Deprecated: Because the Endpoint API is getting simpler
func (e *Engine) NewSignalConnection(ctx context.Context, handler StateEventHandler) (*Connection, error) {
api, err := e.createApi()
if err != nil {
return nil, fmt.Errorf("creating api: %w", err)
}
peerConnection, err := api.NewPeerConnection(e.config)
if err != nil {
return nil, fmt.Errorf("create receiver peer connection: %w ", err)
}
_, iceConnectedCtxCancel := context.WithCancel(ctx)
peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
// fmt.Printf("Connection State has changed %s \n", connectionState.String())
if connectionState == webrtc.ICEConnectionStateConnected {
iceConnectedCtxCancel()
}
})
err = creatDC(peerConnection, handler.OnChannel)
if err != nil {
return nil, fmt.Errorf("creating data channel: %w", err)
}
offer, err := peerConnection.CreateOffer(nil)
if err != nil {
return nil, fmt.Errorf("creating offer: %w", err)
}
gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
if err = peerConnection.SetLocalDescription(offer); err != nil {
return nil, err
}
return &Connection{PeerConnection: peerConnection, GatherComplete: gatherComplete}, nil
}
// NewReceiverConnection
// Deprecated: Because the Endpoint API is getting simpler
func (e *Engine) NewReceiverConnection(ctx context.Context, offer webrtc.SessionDescription, handler StateEventHandler, rtmpEndpoint string) (*Connection, error) {
api, err := e.createApi()
if err != nil {
return nil, fmt.Errorf("creating api: %w", err)
}
peerConnection, err := api.NewPeerConnection(e.config)
if err != nil {
return nil, fmt.Errorf("create receiver peer connection: %w ", err)
}
peerConnection.OnDataChannel(func(d *webrtc.DataChannel) {
slog.Debug("rtp.engine: receiverEndpoint new DataChannel", "label", d.Label(), "id", d.ID())
handler.OnChannel(d)
})
// Allow us to receive 1 audio track, and 1 video track
if _, err = peerConnection.AddTransceiverFromKind(webrtc.RTPCodecTypeAudio); err != nil {
slog.Error("rtp.engine: .addTransceiverFromKind audio", "err", err)
} else if _, err = peerConnection.AddTransceiverFromKind(webrtc.RTPCodecTypeVideo); err != nil {
slog.Error("rtp.engine: .addTransceiverFromKind video", "err", err)
}
go func(ctx context.Context, pc *webrtc.PeerConnection, rtmp string) {
rtmpListener(ctx, pc, rtmp)
}(ctx, peerConnection, rtmpEndpoint)
if err := peerConnection.SetRemoteDescription(offer); err != nil {
return nil, err
}
gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
answer, err := peerConnection.CreateAnswer(nil)
if err != nil {
return nil, err
}
if err = peerConnection.SetLocalDescription(answer); err != nil {
return nil, err
}
return &Connection{
PeerConnection: peerConnection,
GatherComplete: gatherComplete,
}, nil
}