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sdpinfo.go
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sdpinfo.go
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package sdp
import (
"strconv"
"strings"
"time"
"github.com/notedit/sdp/transform"
)
type SDPInfo struct {
version int
streams []*StreamInfo
medias []*MediaInfo // as we need to keep order
candidates []*CandidateInfo // keep order
ice *ICEInfo
dtls *DTLSInfo
crypto *CryptoInfo
}
func NewSDPInfo() *SDPInfo {
sdp := &SDPInfo{
version: 1,
streams: []*StreamInfo{},
medias: []*MediaInfo{},
candidates: []*CandidateInfo{},
}
return sdp
}
func (s *SDPInfo) SetVersion(version int) {
s.version = version
}
func (s *SDPInfo) AddMedia(media *MediaInfo) {
s.medias = append(s.medias, media)
}
func (s *SDPInfo) GetMedia(mtype string) *MediaInfo {
for _, media := range s.medias {
if strings.ToLower(media.GetType()) == strings.ToLower(mtype) {
return media
}
}
return nil
}
func (s *SDPInfo) GetAudioMedia() *MediaInfo {
for _, media := range s.medias {
if strings.ToLower(media.GetType()) == "audio" {
return media
}
}
return nil
}
func (s *SDPInfo) GetVideoMedia() *MediaInfo {
for _, media := range s.medias {
if strings.ToLower(media.GetType()) == "video" {
return media
}
}
return nil
}
func (s *SDPInfo) GetMediasByType(mtype string) []*MediaInfo {
medias := []*MediaInfo{}
for _, media := range s.medias {
if strings.ToLower(media.GetType()) == strings.ToLower(mtype) {
medias = append(medias, media)
}
}
return medias
}
func (s *SDPInfo) GetMediaByID(mid string) *MediaInfo {
for _, media := range s.medias {
if strings.ToLower(media.GetID()) == strings.ToLower(mid) {
return media
}
}
return nil
}
func (s *SDPInfo) ReplaceMedia(media *MediaInfo) bool {
for i, rmedia := range s.medias {
if rmedia.GetID() == media.GetID() {
s.medias[i] = media
return true
}
}
return false
}
func (s *SDPInfo) GetMedias() []*MediaInfo {
return s.medias
}
func (s *SDPInfo) GetVersion() int {
return s.version
}
func (s *SDPInfo) GetDTLS() *DTLSInfo {
return s.dtls
}
func (s *SDPInfo) SetDTLS(dtls *DTLSInfo) {
s.dtls = dtls
}
func (s *SDPInfo) GetCrypto() *CryptoInfo {
return s.crypto
}
func (s *SDPInfo) SetCrypto(crypto *CryptoInfo) {
s.crypto = crypto
}
func (s *SDPInfo) GetICE() *ICEInfo {
return s.ice
}
func (s *SDPInfo) SetICE(ice *ICEInfo) {
s.ice = ice
}
func (s *SDPInfo) AddCandidate(candidate *CandidateInfo) {
if candidate != nil {
s.candidates = append(s.candidates, candidate)
}
}
func (s *SDPInfo) AddCandidates(candidates []*CandidateInfo) {
for _, candidate := range candidates {
s.AddCandidate(candidate)
}
}
func (s *SDPInfo) GetCandidates() []*CandidateInfo {
return s.candidates
}
func (s *SDPInfo) GetStream(id string) *StreamInfo {
for _, v := range s.streams {
if id == v.GetID() {
return v
}
}
return nil
}
func (s *SDPInfo) GetStreams() []*StreamInfo {
return s.streams
}
func (s *SDPInfo) GetFirstStream() *StreamInfo {
for _, stream := range s.streams {
return stream
}
return nil
}
func (s *SDPInfo) AddStream(stream *StreamInfo) {
for idx, v := range s.streams {
if stream.GetID() == v.GetID() {
s.streams[idx] = stream
return
}
}
s.streams = append(s.streams, stream)
}
func (s *SDPInfo) RemoveStream(stream *StreamInfo) {
for idx, v := range s.streams {
if stream.GetID() == v.GetID() {
s.streams = append(s.streams[:idx], s.streams[idx+1:]...)
return
}
}
}
func (s *SDPInfo) RemoveAllStreams() {
s.streams = s.streams[:0]
}
func (s *SDPInfo) GetTrackByMediaID(mid string) *TrackInfo {
for _, stream := range s.streams {
for _, track := range stream.GetTracks() {
if track.GetMID() == mid {
return track
}
}
}
return nil
}
func (s *SDPInfo) GetStreamByMediaID(mid string) *StreamInfo {
for _, stream := range s.streams {
for _, track := range stream.GetTracks() {
if track.GetMID() == mid {
return stream
}
}
}
return nil
}
func (s *SDPInfo) GetVideoTracks() []*TrackInfo {
tracks := []*TrackInfo{}
for _, stream := range s.streams {
for _, track := range stream.GetTracks() {
if strings.ToLower(track.GetMediaType()) == "video" {
tracks = append(tracks, track)
}
}
}
return tracks
}
func (s *SDPInfo) GetAudioTracks() []*TrackInfo {
tracks := []*TrackInfo{}
for _, stream := range s.streams {
for _, track := range stream.GetTracks() {
if strings.ToLower(track.GetMediaType()) == "audio" {
tracks = append(tracks, track)
}
}
}
return tracks
}
func (s *SDPInfo) Answer(ice *ICEInfo, dtls *DTLSInfo, candidates []*CandidateInfo, medias map[string]*Capability) *SDPInfo {
sdpInfo := NewSDPInfo()
if ice != nil {
sdpInfo.SetICE(ice.Clone())
}
if dtls != nil {
sdpInfo.SetDTLS(dtls)
}
for _, candidate := range candidates {
sdpInfo.AddCandidate(candidate)
}
for _, media := range s.medias {
supported := medias[media.GetType()]
if supported != nil {
answer := media.AnswerCapability(supported)
answer.Payloads = media.Payloads
answer.Protocal = media.Protocal
sdpInfo.AddMedia(answer)
}
}
return sdpInfo
}
func (s *SDPInfo) String() string {
sdpMap := &transform.SdpStruct{
Version: 0,
Media: []*transform.MediaStruct{},
Groups: []*transform.GroupStruct{},
}
sdpMap.Origin = &transform.OriginStruct{
Username: "-",
SessionId: strconv.FormatInt(time.Now().UnixNano(), 10),
SessionVersion: s.version,
NetType: "IN",
IpVer: 4,
Address: "127.0.0.1",
}
sdpMap.Connection = &transform.ConnectionStruct{
Version: 4,
Ip: "0.0.0.0",
}
sdpMap.Name = "media"
if s.GetICE().IsLite() {
sdpMap.Icelite = "ice-lite"
}
sdpMap.Timing = &transform.TimingStruct{
Start: 0,
Stop: 0,
}
sdpMap.MsidSemantic = &transform.MsidSemanticStruct{
Semantic: "WMS",
Token: "*",
}
bundleType := "BUNDLE"
bundleMids := []string{}
for _, media := range s.medias {
mediaMap := &transform.MediaStruct{
Type: media.GetType(),
Port: media.GetPort(),
Protocal: media.Protocal, // "UDP/TLS/RTP/SAVP",
Fmtp: []*transform.FmtpStruct{},
Rtp: []*transform.RtpStruct{},
RtcpFb: []*transform.RtcpFbStruct{},
Ext: []*transform.ExtStruct{},
Bandwidth: []*transform.BandwithStruct{},
Candidates: []*transform.CandidateStruct{},
SsrcGroups: []*transform.SsrcGroupStruct{},
Ssrcs: []*transform.SsrcStruct{},
Rids: []*transform.RidStruct{},
}
mediaMap.Direction = media.GetDirection().String()
mediaMap.RtcpMux = "rtcp-mux"
mediaMap.RtcpRsize = "rtcp-rsize"
mediaMap.Mid = media.GetID()
if media.GetDirection() == INACTIVE {
mediaMap.Port = 0
}
if media.GetPort() != 0 {
bundleMids = append(bundleMids, media.GetID())
}
if media.GetBitrate() > 0 {
mediaMap.Bandwidth = append(mediaMap.Bandwidth, &transform.BandwithStruct{
Type: "AS",
Limit: media.GetBitrate(),
})
}
for _, candidate := range s.GetCandidates() {
mediaMap.Candidates = append(mediaMap.Candidates, &transform.CandidateStruct{
Foundation: candidate.GetFoundation(),
Component: candidate.GetComponentID(),
Transport: candidate.GetTransport(),
Priority: candidate.GetPriority(),
Ip: candidate.GetAddress(),
Port: candidate.GetPort(),
Type: candidate.GetType(),
Raddr: candidate.GetRelAddr(),
Rport: candidate.GetRelPort(),
})
}
mediaMap.IceUfrag = s.GetICE().GetUfrag()
mediaMap.IcePwd = s.GetICE().GetPassword()
if s.GetDTLS() != nil {
mediaMap.Fingerprint = &transform.FingerprintStruct{
Type: s.GetDTLS().GetHash(),
Hash: s.GetDTLS().GetFingerprint(),
}
mediaMap.Setup = s.GetDTLS().GetSetup().String()
}
for _, codec := range media.GetCodecs() {
if "video" == strings.ToLower(media.GetType()) {
mediaMap.Rtp = append(mediaMap.Rtp, &transform.RtpStruct{
Payload: codec.GetPayload(),
Codec: strings.ToUpper(codec.GetCodec()),
Rate: 90000,
})
} else {
if "opus" == strings.ToLower(codec.GetCodec()) {
mediaMap.Rtp = append(mediaMap.Rtp, &transform.RtpStruct{
Payload: codec.GetPayload(),
Codec: codec.GetCodec(),
Rate: codec.GetRate(),
Encoding: 2,
})
} else {
mediaMap.Rtp = append(mediaMap.Rtp, &transform.RtpStruct{
Payload: codec.GetPayload(),
Codec: codec.GetCodec(),
Rate: codec.GetRate(),
})
}
}
for _, rtcpfb := range codec.GetRTCPFeedbacks() {
mediaMap.RtcpFb = append(mediaMap.RtcpFb, &transform.RtcpFbStruct{
Payload: codec.GetPayload(),
Type: rtcpfb.GetID(),
Subtype: strings.Join(rtcpfb.GetParams(), " "),
})
}
if codec.HasRTX() {
mediaMap.Rtp = append(mediaMap.Rtp, &transform.RtpStruct{
Payload: codec.GetRTX(),
Codec: "rtx",
Rate: 90000,
})
mediaMap.Fmtp = append(mediaMap.Fmtp, &transform.FmtpStruct{
Payload: codec.GetRTX(),
Config: "apt=" + strconv.Itoa(codec.GetPayload()),
})
}
params := codec.GetParams()
if params != nil && len(params) > 0 {
fmtp := &transform.FmtpStruct{
Payload: codec.GetPayload(),
Config: "",
}
for k, v := range params {
if fmtp.Config != "" {
fmtp.Config = fmtp.Config + ";"
}
// k and value
if v != "" {
fmtp.Config = fmtp.Config + k + "=" + v
} else {
fmtp.Config = fmtp.Config + k
}
}
mediaMap.Fmtp = append(mediaMap.Fmtp, fmtp)
}
}
payloads := []int{}
for _, rtp := range mediaMap.Rtp {
payloads = append(payloads, rtp.Payload)
}
if strings.ToLower(media.mtype) == "application" {
mediaMap.SctpMap = &transform.SctpMapStuct{
5000,
"webrtc-datachannel",
1024,
}
mediaMap.Payloads = media.Payloads
// mediaMap.SctpPort = 5000
mediaMap.SctpMaxSize = 256 * 1024
mediaMap.RtcpMux = ""
mediaMap.RtcpRsize = ""
} else {
mediaMap.Payloads = intArrayToString(payloads, " ")
}
for id, uri := range media.GetExtensions() {
mediaMap.Ext = append(mediaMap.Ext, &transform.ExtStruct{
Value: id,
Uri: uri,
})
}
for _, ridInfo := range media.GetRIDS() {
rid := &transform.RidStruct{
Id: ridInfo.GetID(),
Direction: ridInfo.GetDirection().String(),
Params: "",
}
if len(ridInfo.GetFormats()) > 0 {
//rid.Params = "pt=" + strings.Join(ridInfo.GetFormats(), ",")
rid.Params = "pt=" + intArrayToString(ridInfo.GetFormats(), ",")
}
for key, val := range ridInfo.GetParams() {
if rid.Params == "" {
rid.Params = key + "=" + val
} else {
rid.Params = rid.Params + ";" + key + "=" + val
}
}
mediaMap.Rids = append(mediaMap.Rids, rid)
}
if media.GetSimulcastInfo() != nil {
simulcast := media.GetSimulcastInfo()
index := 1
mediaMap.Simulcast = &transform.SimulcastStruct{}
sendStreams := simulcast.GetSimulcastStreams(SEND)
recvStreams := simulcast.GetSimulcastStreams(RECV)
if sendStreams != nil && len(sendStreams) > 0 {
list := ""
for _, stream := range sendStreams {
alternatives := ""
for _, item := range stream {
if alternatives == "" {
if item.IsPaused() {
alternatives = alternatives + "~" + item.GetID()
} else {
alternatives = alternatives + item.GetID()
}
} else {
if item.IsPaused() {
alternatives = alternatives + "," + "~" + item.GetID()
} else {
alternatives = alternatives + "," + item.GetID()
}
}
}
if list == "" {
list = list + alternatives
} else {
list = list + ";" + alternatives
}
}
mediaMap.Simulcast.Dir1 = "send"
mediaMap.Simulcast.List1 = list
index = index + 1
}
if recvStreams != nil && len(recvStreams) > 0 {
list := ""
for _, stream := range recvStreams {
alternatives := ""
for _, item := range stream {
if alternatives == "" {
if item.IsPaused() {
alternatives = alternatives + "~" + item.GetID()
} else {
alternatives = alternatives + item.GetID()
}
} else {
if item.IsPaused() {
alternatives = alternatives + "," + "~" + item.GetID()
} else {
alternatives = alternatives + "," + item.GetID()
}
}
}
if list == "" {
list = list + alternatives
} else {
list = list + ";" + alternatives
}
}
if index == 1 {
mediaMap.Simulcast.Dir1 = "recv"
mediaMap.Simulcast.List1 = list
}
if index == 2 {
mediaMap.Simulcast.Dir2 = "recv"
mediaMap.Simulcast.List2 = list
}
}
}
sdpMap.Media = append(sdpMap.Media, mediaMap)
}
// streams
for _, stream := range s.GetStreams() {
for _, track := range stream.GetTracks() {
for _, md := range sdpMap.Media {
// check if it is unified or plan b
if track.GetMID() != "" {
if track.GetMID() == md.Mid {
groups := track.GetSourceGroupS()
for _, group := range groups {
md.SsrcGroups = append(md.SsrcGroups, &transform.SsrcGroupStruct{
Semantics: group.GetSemantics(),
Ssrcs: uint32ArrayToString(group.GetSSRCs(), " "),
})
}
ssrcs := track.GetSSRCS()
for _, ssrc := range ssrcs {
md.Ssrcs = append(md.Ssrcs, &transform.SsrcStruct{
Id: ssrc,
Attribute: "cname",
Value: stream.GetID(),
})
md.Ssrcs = append(md.Ssrcs, &transform.SsrcStruct{
Id: ssrc,
Attribute: "msid",
Value: stream.GetID() + " " + track.GetID(),
})
}
md.Msid = stream.GetID() + " " + track.GetID()
break
}
} else if strings.ToLower(md.Type) == strings.ToLower(track.GetMediaType()) {
groups := track.GetSourceGroupS()
for _, group := range groups {
md.SsrcGroups = append(md.SsrcGroups, &transform.SsrcGroupStruct{
Semantics: group.GetSemantics(),
Ssrcs: uint32ArrayToString(group.GetSSRCs(), " "),
})
}
ssrcs := track.GetSSRCS()
for _, ssrc := range ssrcs {
md.Ssrcs = append(md.Ssrcs, &transform.SsrcStruct{
Id: ssrc,
Attribute: "cname",
Value: stream.GetID(),
})
md.Ssrcs = append(md.Ssrcs, &transform.SsrcStruct{
Id: ssrc,
Attribute: "msid",
Value: stream.GetID() + " " + track.GetID(),
})
}
break
}
}
}
}
sdpMap.Groups = append(sdpMap.Groups, &transform.GroupStruct{
Mids: strings.Join(bundleMids, " "),
Type: bundleType,
})
sdpStr, err := transform.Write(sdpMap)
if err != nil {
println(err)
}
return sdpStr
}
func (s *SDPInfo) Clone() *SDPInfo {
cloned := NewSDPInfo()
cloned.SetVersion(s.GetVersion())
for _, media := range s.GetMedias() {
cloned.AddMedia(media.Clone())
}
for _, stream := range s.GetStreams() {
cloned.AddStream(stream.Clone())
}
for _, candidate := range s.GetCandidates() {
cloned.AddCandidate(candidate)
}
cloned.SetICE(s.GetICE().Clone())
if s.GetDTLS() != nil {
cloned.SetDTLS(s.GetDTLS().Clone())
}
if s.GetCrypto() != nil {
cloned.SetCrypto(s.GetCrypto().Clone())
}
return cloned
}
// Unify return an unified plan version of the SDP info
func (s *SDPInfo) Unify() *SDPInfo {
cloned := NewSDPInfo()
cloned.version = s.version
for _, media := range s.medias {
cloned.AddMedia(media.Clone())
}
medias := map[string][]*MediaInfo{
"audio": cloned.GetMediasByType("audio"),
"video": cloned.GetMediasByType("video"),
}
for _, stream := range s.streams {
clonedStream := stream.Clone()
for _, clonedTrack := range clonedStream.GetTracks() {
var clonedMedia *MediaInfo
if len(medias[clonedTrack.GetMediaType()]) == 0 {
media := s.GetMedia(clonedTrack.GetMediaType())
clonedMedia = media.Clone()
clonedMedia.SetID(clonedTrack.GetID())
cloned.AddMedia(clonedMedia)
} else {
mediaList := medias[clonedTrack.GetMediaType()]
clonedMedia = mediaList[len(mediaList)-1]
mediaList = mediaList[:len(mediaList)-1]
medias[clonedTrack.GetMediaType()] = mediaList
}
clonedTrack.SetMID(clonedMedia.GetID())
}
cloned.AddStream(clonedStream)
}
for _, candidate := range s.GetCandidates() {
cloned.AddCandidate(candidate.Clone())
}
cloned.SetICE(s.GetICE().Clone())
if s.GetDTLS() != nil {
cloned.SetDTLS(s.GetDTLS().Clone())
}
if s.GetCrypto() != nil {
cloned.SetCrypto(s.GetCrypto().Clone())
}
return cloned
}
func Create(ice *ICEInfo, dtls *DTLSInfo, candidates []*CandidateInfo, capabilities map[string]*Capability) *SDPInfo {
sdpInfo := NewSDPInfo()
if ice != nil {
sdpInfo.SetICE(ice.Clone())
}
if dtls != nil {
sdpInfo.SetDTLS(dtls)
}
for _, candidate := range candidates {
sdpInfo.AddCandidate(candidate)
}
dyn := 96
for mType, capability := range capabilities {
media := MediaInfoCreate(mType, capability)
for _, codec := range media.GetCodecs() {
if codec.GetPayload() >= 96 {
dyn++
codec.SetPayload(dyn)
}
if codec.GetRTX() > 0 {
dyn++
codec.SetRTX(dyn)
}
}
sdpInfo.AddMedia(media)
}
return sdpInfo
}
func Create2(capabilities map[string]*Capability) *SDPInfo {
sdpInfo := NewSDPInfo()
dyn := 96
for mType, capability := range capabilities {
media := MediaInfoCreate(mType, capability)
for _, codec := range media.GetCodecs() {
if codec.GetPayload() >= 96 {
dyn++
codec.SetPayload(dyn)
}
if codec.GetRTX() > 0 {
dyn++
codec.SetRTX(dyn)
}
}
sdpInfo.AddMedia(media)
}
return sdpInfo
}
func Parse(sdp string) (*SDPInfo, error) {
sdpMap, err := transform.Parse(sdp)
if err != nil {
return nil, err
}
sdpInfo := NewSDPInfo()
sdpInfo.SetVersion(sdpMap.Version)
for _, md := range sdpMap.Media {
media := md.Type
mid := md.Mid
if len(mid) == 0 {
continue
}
mediaInfo := NewMediaInfo(mid, media)
mediaInfo.Payloads = md.Payloads
mediaInfo.Protocal = md.Protocal
ufrag := md.IceUfrag
pwd := md.IcePwd
sdpInfo.SetICE(NewICEInfo(ufrag, pwd))
for _, candiate := range md.Candidates {
candidateInfo := NewCandidateInfo(
candiate.Foundation,
candiate.Component,
candiate.Transport,
candiate.Priority,
candiate.Ip,
candiate.Port,
candiate.Type,
candiate.Raddr,
candiate.Rport)
sdpInfo.AddCandidate(candidateInfo)
}
var remoteHash, remoteFingerprint string
if sdpMap.Fingerprint != nil {
remoteHash = sdpMap.Fingerprint.Type
remoteFingerprint = sdpMap.Fingerprint.Hash
}
if md.Fingerprint != nil {
remoteHash = md.Fingerprint.Type
remoteFingerprint = md.Fingerprint.Hash
}
setup := SETUPACTPASS
if md.Setup != "" {
setup = SetupByValue(md.Setup)
}
sdpInfo.SetDTLS(NewDTLSInfo(setup, remoteHash, remoteFingerprint))
if md.BundleOnly != "" && md.Port == 0 {
md.Port = 9
}
direction := SENDRECV
if md.Direction != "" {
direction = DirectionbyValue(md.Direction)
}
mediaInfo.SetDirection(direction)
mediaInfo.SetPort(md.Port)
apts := map[int]int{}
for _, fmt := range md.Rtp {
payload := fmt.Payload
codec := fmt.Codec
rate := fmt.Rate
if "RED" == strings.ToUpper(codec) || "ULPFEC" == strings.ToUpper(codec) {
continue
}
params := map[string]string{}
for _, fmtp := range md.Fmtp {
if fmtp.Payload == payload {
list := strings.Split(fmtp.Config, ";")
for _, kv := range list {
param := strings.Split(kv, "=")
if len(param) < 2 {
continue
}
params[param[0]] = param[1]
}
}
}
if "RTX" == strings.ToUpper(codec) {
if apt, ok := params["apt"]; ok {
aptint, _ := strconv.Atoi(apt)
apts[aptint] = payload
}
} else {
codecInfo := NewCodecInfo(codec, payload, rate)
codecInfo.AddParams(params)
mediaInfo.AddCodec(codecInfo)
}
}
// rtx
for pt1, pt2 := range apts {
codecInfo := mediaInfo.GetCodecForType(pt1)
if codecInfo != nil {
codecInfo.SetRTX(pt2)
}
}
// rtcpFb
if md.RtcpFb != nil {
for _, rtcfb := range md.RtcpFb {
codecInfo := mediaInfo.GetCodecForType(rtcfb.Payload)
if codecInfo != nil {
id := rtcfb.Type
params := []string{}
if rtcfb.Subtype != "" {
params = strings.Split(rtcfb.Subtype, " ")
}
codecInfo.AddRTCPFeedback(NewRTCPFeedbackInfo(id, params))
}
}
}
// extmap
for _, extmap := range md.Ext {
mediaInfo.AddExtension(extmap.Value, extmap.Uri)
}
for _, rid := range md.Rids {
direction := DirectionWaybyValue(rid.Direction)
ridInfo := NewRIDInfo(rid.Id, direction)
formats := []string{}
params := map[string]string{}
if rid.Params != "" {
list := transform.ParseParams(rid.Params)
for k, v := range list {
if k == "pt" {
formats = strings.Split(v, ",")
} else {
params[k] = v
}
}
ridInfo.SetFormats(formats)
ridInfo.SetParams(params)
}
mediaInfo.AddRID(ridInfo)
}
encodings := [][]*TrackEncodingInfo{}
if md.Simulcast != nil {
simulcast := NewSimulcastInfo()
if md.Simulcast.Dir1 != "" {
direction := DirectionWaybyValue(md.Simulcast.Dir1)
streamList := transform.ParseSimulcastStreamList(md.Simulcast.List1)
for _, streams := range streamList {
alternatives := []*SimulcastStreamInfo{}
for _, stream := range streams {
simulcastStreamInfo := NewSimulcastStreamInfo(stream.Scid, stream.Paused)
alternatives = append(alternatives, simulcastStreamInfo)
}
simulcast.AddSimulcastAlternativeStreams(direction, alternatives)
}
}
if md.Simulcast.Dir2 != "" {
direction := DirectionWaybyValue(md.Simulcast.Dir2)
streamList := transform.ParseSimulcastStreamList(md.Simulcast.List2)
for _, streams := range streamList {
alternatives := []*SimulcastStreamInfo{}
for _, stream := range streams {