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mediaengine.go
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mediaengine.go
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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
//go:build !js
// +build !js
package webrtc
import (
"fmt"
"strconv"
"strings"
"sync"
"time"
"github.com/pion/rtp"
"github.com/pion/rtp/codecs"
"github.com/pion/sdp/v3"
"github.com/pion/webrtc/v4/internal/fmtp"
)
const (
// MimeTypeH264 H264 MIME type.
// Note: Matching should be case insensitive.
MimeTypeH264 = "video/H264"
// MimeTypeH265 H265 MIME type
// Note: Matching should be case insensitive.
MimeTypeH265 = "video/H265"
// MimeTypeOpus Opus MIME type
// Note: Matching should be case insensitive.
MimeTypeOpus = "audio/opus"
// MimeTypeVP8 VP8 MIME type
// Note: Matching should be case insensitive.
MimeTypeVP8 = "video/VP8"
// MimeTypeVP9 VP9 MIME type
// Note: Matching should be case insensitive.
MimeTypeVP9 = "video/VP9"
// MimeTypeAV1 AV1 MIME type
// Note: Matching should be case insensitive.
MimeTypeAV1 = "video/AV1"
// MimeTypeG722 G722 MIME type
// Note: Matching should be case insensitive.
MimeTypeG722 = "audio/G722"
// MimeTypePCMU PCMU MIME type
// Note: Matching should be case insensitive.
MimeTypePCMU = "audio/PCMU"
// MimeTypePCMA PCMA MIME type
// Note: Matching should be case insensitive.
MimeTypePCMA = "audio/PCMA"
// MimeTypeRTX RTX MIME type
// Note: Matching should be case insensitive.
MimeTypeRTX = "video/rtx"
// MimeTypeFlexFEC FEC MIME Type
// Note: Matching should be case insensitive.
MimeTypeFlexFEC = "video/flexfec"
)
type mediaEngineHeaderExtension struct {
uri string
isAudio, isVideo bool
// If set only Transceivers of this direction are allowed
allowedDirections []RTPTransceiverDirection
}
// A MediaEngine defines the codecs supported by a PeerConnection, and the
// configuration of those codecs.
type MediaEngine struct {
// If we have attempted to negotiate a codec type yet.
negotiatedVideo, negotiatedAudio bool
videoCodecs, audioCodecs []RTPCodecParameters
negotiatedVideoCodecs, negotiatedAudioCodecs []RTPCodecParameters
headerExtensions []mediaEngineHeaderExtension
negotiatedHeaderExtensions map[int]mediaEngineHeaderExtension
mu sync.RWMutex
}
// RegisterDefaultCodecs registers the default codecs supported by Pion WebRTC.
// RegisterDefaultCodecs is not safe for concurrent use.
func (m *MediaEngine) RegisterDefaultCodecs() error {
// Default Pion Audio Codecs
for _, codec := range []RTPCodecParameters{
{
RTPCodecCapability: RTPCodecCapability{MimeTypeOpus, 48000, 2, "minptime=10;useinbandfec=1", nil},
PayloadType: 111,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeG722, 8000, 0, "", nil},
PayloadType: rtp.PayloadTypeG722,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypePCMU, 8000, 0, "", nil},
PayloadType: rtp.PayloadTypePCMU,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypePCMA, 8000, 0, "", nil},
PayloadType: rtp.PayloadTypePCMA,
},
} {
if err := m.RegisterCodec(codec, RTPCodecTypeAudio); err != nil {
return err
}
}
videoRTCPFeedback := []RTCPFeedback{{"goog-remb", ""}, {"ccm", "fir"}, {"nack", ""}, {"nack", "pli"}}
for _, codec := range []RTPCodecParameters{
{
RTPCodecCapability: RTPCodecCapability{MimeTypeVP8, 90000, 0, "", videoRTCPFeedback},
PayloadType: 96,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=96", nil},
PayloadType: 97,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42001f", videoRTCPFeedback},
PayloadType: 102,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=102", nil},
PayloadType: 103,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42001f", videoRTCPFeedback},
PayloadType: 104,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=104", nil},
PayloadType: 105,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f", videoRTCPFeedback},
PayloadType: 106,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=106", nil},
PayloadType: 107,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=42e01f", videoRTCPFeedback},
PayloadType: 108,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=108", nil},
PayloadType: 109,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=4d001f", videoRTCPFeedback},
PayloadType: 127,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=127", nil},
PayloadType: 125,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=0;profile-level-id=4d001f", videoRTCPFeedback},
PayloadType: 39,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=39", nil},
PayloadType: 40,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeAV1, 90000, 0, "", videoRTCPFeedback},
PayloadType: 45,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=45", nil},
PayloadType: 46,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeVP9, 90000, 0, "profile-id=0", videoRTCPFeedback},
PayloadType: 98,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=98", nil},
PayloadType: 99,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeVP9, 90000, 0, "profile-id=2", videoRTCPFeedback},
PayloadType: 100,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=100", nil},
PayloadType: 101,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeH264, 90000, 0, "level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=64001f", videoRTCPFeedback},
PayloadType: 112,
},
{
RTPCodecCapability: RTPCodecCapability{MimeTypeRTX, 90000, 0, "apt=112", nil},
PayloadType: 113,
},
} {
if err := m.RegisterCodec(codec, RTPCodecTypeVideo); err != nil {
return err
}
}
return nil
}
// addCodec will append codec if it not exists
func (m *MediaEngine) addCodec(codecs []RTPCodecParameters, codec RTPCodecParameters) []RTPCodecParameters {
for _, c := range codecs {
if c.MimeType == codec.MimeType && c.PayloadType == codec.PayloadType {
return codecs
}
}
return append(codecs, codec)
}
// RegisterCodec adds codec to the MediaEngine
// These are the list of codecs supported by this PeerConnection.
// RegisterCodec is not safe for concurrent use.
func (m *MediaEngine) RegisterCodec(codec RTPCodecParameters, typ RTPCodecType) error {
m.mu.Lock()
defer m.mu.Unlock()
codec.statsID = fmt.Sprintf("RTPCodec-%d", time.Now().UnixNano())
switch typ {
case RTPCodecTypeAudio:
m.audioCodecs = m.addCodec(m.audioCodecs, codec)
case RTPCodecTypeVideo:
m.videoCodecs = m.addCodec(m.videoCodecs, codec)
default:
return ErrUnknownType
}
return nil
}
// RegisterHeaderExtension adds a header extension to the MediaEngine
// To determine the negotiated value use `GetHeaderExtensionID` after signaling is complete
func (m *MediaEngine) RegisterHeaderExtension(extension RTPHeaderExtensionCapability, typ RTPCodecType, allowedDirections ...RTPTransceiverDirection) error {
m.mu.Lock()
defer m.mu.Unlock()
if m.negotiatedHeaderExtensions == nil {
m.negotiatedHeaderExtensions = map[int]mediaEngineHeaderExtension{}
}
if len(allowedDirections) == 0 {
allowedDirections = []RTPTransceiverDirection{RTPTransceiverDirectionRecvonly, RTPTransceiverDirectionSendonly}
}
for _, direction := range allowedDirections {
if direction != RTPTransceiverDirectionRecvonly && direction != RTPTransceiverDirectionSendonly {
return ErrRegisterHeaderExtensionInvalidDirection
}
}
extensionIndex := -1
for i := range m.headerExtensions {
if extension.URI == m.headerExtensions[i].uri {
extensionIndex = i
}
}
if extensionIndex == -1 {
m.headerExtensions = append(m.headerExtensions, mediaEngineHeaderExtension{})
extensionIndex = len(m.headerExtensions) - 1
}
if typ == RTPCodecTypeAudio {
m.headerExtensions[extensionIndex].isAudio = true
} else if typ == RTPCodecTypeVideo {
m.headerExtensions[extensionIndex].isVideo = true
}
m.headerExtensions[extensionIndex].uri = extension.URI
m.headerExtensions[extensionIndex].allowedDirections = allowedDirections
return nil
}
// RegisterFeedback adds feedback mechanism to already registered codecs.
func (m *MediaEngine) RegisterFeedback(feedback RTCPFeedback, typ RTPCodecType) {
m.mu.Lock()
defer m.mu.Unlock()
if typ == RTPCodecTypeVideo {
for i, v := range m.videoCodecs {
v.RTCPFeedback = append(v.RTCPFeedback, feedback)
m.videoCodecs[i] = v
}
} else if typ == RTPCodecTypeAudio {
for i, v := range m.audioCodecs {
v.RTCPFeedback = append(v.RTCPFeedback, feedback)
m.audioCodecs[i] = v
}
}
}
// getHeaderExtensionID returns the negotiated ID for a header extension.
// If the Header Extension isn't enabled ok will be false
func (m *MediaEngine) getHeaderExtensionID(extension RTPHeaderExtensionCapability) (val int, audioNegotiated, videoNegotiated bool) {
m.mu.RLock()
defer m.mu.RUnlock()
if m.negotiatedHeaderExtensions == nil {
return 0, false, false
}
for id, h := range m.negotiatedHeaderExtensions {
if extension.URI == h.uri {
return id, h.isAudio, h.isVideo
}
}
return
}
// copy copies any user modifiable state of the MediaEngine
// all internal state is reset
func (m *MediaEngine) copy() *MediaEngine {
m.mu.Lock()
defer m.mu.Unlock()
cloned := &MediaEngine{
videoCodecs: append([]RTPCodecParameters{}, m.videoCodecs...),
audioCodecs: append([]RTPCodecParameters{}, m.audioCodecs...),
headerExtensions: append([]mediaEngineHeaderExtension{}, m.headerExtensions...),
}
if len(m.headerExtensions) > 0 {
cloned.negotiatedHeaderExtensions = map[int]mediaEngineHeaderExtension{}
}
return cloned
}
func findCodecByPayload(codecs []RTPCodecParameters, payloadType PayloadType) *RTPCodecParameters {
for _, codec := range codecs {
if codec.PayloadType == payloadType {
return &codec
}
}
return nil
}
func (m *MediaEngine) getCodecByPayload(payloadType PayloadType) (RTPCodecParameters, RTPCodecType, error) {
m.mu.RLock()
defer m.mu.RUnlock()
// if we've negotiated audio or video, check the negotiated types before our
// built-in payload types, to ensure we pick the codec the other side wants.
if m.negotiatedVideo {
if codec := findCodecByPayload(m.negotiatedVideoCodecs, payloadType); codec != nil {
return *codec, RTPCodecTypeVideo, nil
}
}
if m.negotiatedAudio {
if codec := findCodecByPayload(m.negotiatedAudioCodecs, payloadType); codec != nil {
return *codec, RTPCodecTypeAudio, nil
}
}
if !m.negotiatedVideo {
if codec := findCodecByPayload(m.videoCodecs, payloadType); codec != nil {
return *codec, RTPCodecTypeVideo, nil
}
}
if !m.negotiatedAudio {
if codec := findCodecByPayload(m.audioCodecs, payloadType); codec != nil {
return *codec, RTPCodecTypeAudio, nil
}
}
return RTPCodecParameters{}, 0, ErrCodecNotFound
}
func (m *MediaEngine) collectStats(collector *statsReportCollector) {
m.mu.RLock()
defer m.mu.RUnlock()
statsLoop := func(codecs []RTPCodecParameters) {
for _, codec := range codecs {
collector.Collecting()
stats := CodecStats{
Timestamp: statsTimestampFrom(time.Now()),
Type: StatsTypeCodec,
ID: codec.statsID,
PayloadType: codec.PayloadType,
MimeType: codec.MimeType,
ClockRate: codec.ClockRate,
Channels: uint8(codec.Channels),
SDPFmtpLine: codec.SDPFmtpLine,
}
collector.Collect(stats.ID, stats)
}
}
statsLoop(m.videoCodecs)
statsLoop(m.audioCodecs)
}
// Look up a codec and enable if it exists
func (m *MediaEngine) matchRemoteCodec(remoteCodec RTPCodecParameters, typ RTPCodecType, exactMatches, partialMatches []RTPCodecParameters) (codecMatchType, error) {
codecs := m.videoCodecs
if typ == RTPCodecTypeAudio {
codecs = m.audioCodecs
}
remoteFmtp := fmtp.Parse(remoteCodec.RTPCodecCapability.MimeType, remoteCodec.RTPCodecCapability.SDPFmtpLine)
if apt, hasApt := remoteFmtp.Parameter("apt"); hasApt {
payloadType, err := strconv.ParseUint(apt, 10, 8)
if err != nil {
return codecMatchNone, err
}
aptMatch := codecMatchNone
var aptCodec RTPCodecParameters
for _, codec := range exactMatches {
if codec.PayloadType == PayloadType(payloadType) {
aptMatch = codecMatchExact
aptCodec = codec
break
}
}
if aptMatch == codecMatchNone {
for _, codec := range partialMatches {
if codec.PayloadType == PayloadType(payloadType) {
aptMatch = codecMatchPartial
aptCodec = codec
break
}
}
}
if aptMatch == codecMatchNone {
return codecMatchNone, nil // not an error, we just ignore this codec we don't support
}
// replace the apt value with the original codec's payload type
toMatchCodec := remoteCodec
if aptMatched, mt := codecParametersFuzzySearch(aptCodec, codecs); mt == aptMatch {
toMatchCodec.SDPFmtpLine = strings.Replace(toMatchCodec.SDPFmtpLine, fmt.Sprintf("apt=%d", payloadType), fmt.Sprintf("apt=%d", aptMatched.PayloadType), 1)
}
// if apt's media codec is partial match, then apt codec must be partial match too
_, matchType := codecParametersFuzzySearch(toMatchCodec, codecs)
if matchType == codecMatchExact && aptMatch == codecMatchPartial {
matchType = codecMatchPartial
}
return matchType, nil
}
_, matchType := codecParametersFuzzySearch(remoteCodec, codecs)
return matchType, nil
}
// Update header extensions from a remote media section
func (m *MediaEngine) updateHeaderExtensionFromMediaSection(media *sdp.MediaDescription) error {
var typ RTPCodecType
switch {
case strings.EqualFold(media.MediaName.Media, "audio"):
typ = RTPCodecTypeAudio
case strings.EqualFold(media.MediaName.Media, "video"):
typ = RTPCodecTypeVideo
default:
return nil
}
extensions, err := rtpExtensionsFromMediaDescription(media)
if err != nil {
return err
}
for extension, id := range extensions {
if err = m.updateHeaderExtension(id, extension, typ); err != nil {
return err
}
}
return nil
}
// Look up a header extension and enable if it exists
func (m *MediaEngine) updateHeaderExtension(id int, extension string, typ RTPCodecType) error {
if m.negotiatedHeaderExtensions == nil {
return nil
}
for _, localExtension := range m.headerExtensions {
if localExtension.uri == extension {
h := mediaEngineHeaderExtension{uri: extension, allowedDirections: localExtension.allowedDirections}
if existingValue, ok := m.negotiatedHeaderExtensions[id]; ok {
h = existingValue
}
switch {
case localExtension.isAudio && typ == RTPCodecTypeAudio:
h.isAudio = true
case localExtension.isVideo && typ == RTPCodecTypeVideo:
h.isVideo = true
}
m.negotiatedHeaderExtensions[id] = h
}
}
return nil
}
func (m *MediaEngine) pushCodecs(codecs []RTPCodecParameters, typ RTPCodecType) {
for _, codec := range codecs {
if typ == RTPCodecTypeAudio {
m.negotiatedAudioCodecs = m.addCodec(m.negotiatedAudioCodecs, codec)
} else if typ == RTPCodecTypeVideo {
m.negotiatedVideoCodecs = m.addCodec(m.negotiatedVideoCodecs, codec)
}
}
}
// Update the MediaEngine from a remote description
func (m *MediaEngine) updateFromRemoteDescription(desc sdp.SessionDescription) error {
m.mu.Lock()
defer m.mu.Unlock()
for _, media := range desc.MediaDescriptions {
var typ RTPCodecType
switch {
case strings.EqualFold(media.MediaName.Media, "audio"):
typ = RTPCodecTypeAudio
case strings.EqualFold(media.MediaName.Media, "video"):
typ = RTPCodecTypeVideo
}
switch {
case !m.negotiatedAudio && typ == RTPCodecTypeAudio:
m.negotiatedAudio = true
case !m.negotiatedVideo && typ == RTPCodecTypeVideo:
m.negotiatedVideo = true
default:
// update header extesions from remote sdp if codec is negotiated, Firefox
// would send updated header extension in renegotiation.
// e.g. publish first track without simucalst ->negotiated-> publish second track with simucalst
// then the two media secontions have different rtp header extensions in offer
if err := m.updateHeaderExtensionFromMediaSection(media); err != nil {
return err
}
continue
}
codecs, err := codecsFromMediaDescription(media)
if err != nil {
return err
}
exactMatches := make([]RTPCodecParameters, 0, len(codecs))
partialMatches := make([]RTPCodecParameters, 0, len(codecs))
for _, codec := range codecs {
matchType, mErr := m.matchRemoteCodec(codec, typ, exactMatches, partialMatches)
if mErr != nil {
return mErr
}
if matchType == codecMatchExact {
exactMatches = append(exactMatches, codec)
} else if matchType == codecMatchPartial {
partialMatches = append(partialMatches, codec)
}
}
// use exact matches when they exist, otherwise fall back to partial
switch {
case len(exactMatches) > 0:
m.pushCodecs(exactMatches, typ)
case len(partialMatches) > 0:
m.pushCodecs(partialMatches, typ)
default:
// no match, not negotiated
continue
}
if err := m.updateHeaderExtensionFromMediaSection(media); err != nil {
return err
}
}
return nil
}
func (m *MediaEngine) getCodecsByKind(typ RTPCodecType) []RTPCodecParameters {
m.mu.RLock()
defer m.mu.RUnlock()
if typ == RTPCodecTypeVideo {
if m.negotiatedVideo {
return m.negotiatedVideoCodecs
}
return m.videoCodecs
} else if typ == RTPCodecTypeAudio {
if m.negotiatedAudio {
return m.negotiatedAudioCodecs
}
return m.audioCodecs
}
return nil
}
func (m *MediaEngine) getRTPParametersByKind(typ RTPCodecType, directions []RTPTransceiverDirection) RTPParameters { //nolint:gocognit
headerExtensions := make([]RTPHeaderExtensionParameter, 0)
// perform before locking to prevent recursive RLocks
foundCodecs := m.getCodecsByKind(typ)
m.mu.RLock()
defer m.mu.RUnlock()
if m.negotiatedVideo && typ == RTPCodecTypeVideo ||
m.negotiatedAudio && typ == RTPCodecTypeAudio {
for id, e := range m.negotiatedHeaderExtensions {
if haveRTPTransceiverDirectionIntersection(e.allowedDirections, directions) && (e.isAudio && typ == RTPCodecTypeAudio || e.isVideo && typ == RTPCodecTypeVideo) {
headerExtensions = append(headerExtensions, RTPHeaderExtensionParameter{ID: id, URI: e.uri})
}
}
} else {
mediaHeaderExtensions := make(map[int]mediaEngineHeaderExtension)
for _, e := range m.headerExtensions {
usingNegotiatedID := false
for id := range m.negotiatedHeaderExtensions {
if m.negotiatedHeaderExtensions[id].uri == e.uri {
usingNegotiatedID = true
mediaHeaderExtensions[id] = e
break
}
}
if !usingNegotiatedID {
for id := 1; id < 15; id++ {
idAvailable := true
if _, ok := mediaHeaderExtensions[id]; ok {
idAvailable = false
}
if _, taken := m.negotiatedHeaderExtensions[id]; idAvailable && !taken {
mediaHeaderExtensions[id] = e
break
}
}
}
}
for id, e := range mediaHeaderExtensions {
if haveRTPTransceiverDirectionIntersection(e.allowedDirections, directions) && (e.isAudio && typ == RTPCodecTypeAudio || e.isVideo && typ == RTPCodecTypeVideo) {
headerExtensions = append(headerExtensions, RTPHeaderExtensionParameter{ID: id, URI: e.uri})
}
}
}
return RTPParameters{
HeaderExtensions: headerExtensions,
Codecs: foundCodecs,
}
}
func (m *MediaEngine) getRTPParametersByPayloadType(payloadType PayloadType) (RTPParameters, error) {
codec, typ, err := m.getCodecByPayload(payloadType)
if err != nil {
return RTPParameters{}, err
}
m.mu.RLock()
defer m.mu.RUnlock()
headerExtensions := make([]RTPHeaderExtensionParameter, 0)
for id, e := range m.negotiatedHeaderExtensions {
if e.isAudio && typ == RTPCodecTypeAudio || e.isVideo && typ == RTPCodecTypeVideo {
headerExtensions = append(headerExtensions, RTPHeaderExtensionParameter{ID: id, URI: e.uri})
}
}
return RTPParameters{
HeaderExtensions: headerExtensions,
Codecs: []RTPCodecParameters{codec},
}, nil
}
func payloaderForCodec(codec RTPCodecCapability) (rtp.Payloader, error) {
switch strings.ToLower(codec.MimeType) {
case strings.ToLower(MimeTypeH264):
return &codecs.H264Payloader{}, nil
case strings.ToLower(MimeTypeOpus):
return &codecs.OpusPayloader{}, nil
case strings.ToLower(MimeTypeVP8):
return &codecs.VP8Payloader{
EnablePictureID: true,
}, nil
case strings.ToLower(MimeTypeVP9):
return &codecs.VP9Payloader{}, nil
case strings.ToLower(MimeTypeAV1):
return &codecs.AV1Payloader{}, nil
case strings.ToLower(MimeTypeG722):
return &codecs.G722Payloader{}, nil
case strings.ToLower(MimeTypePCMU), strings.ToLower(MimeTypePCMA):
return &codecs.G711Payloader{}, nil
default:
return nil, ErrNoPayloaderForCodec
}
}
func (m *MediaEngine) isRTXEnabled(typ RTPCodecType, directions []RTPTransceiverDirection) bool {
for _, p := range m.getRTPParametersByKind(typ, directions).Codecs {
if p.MimeType == MimeTypeRTX {
return true
}
}
return false
}
func (m *MediaEngine) isFECEnabled(typ RTPCodecType, directions []RTPTransceiverDirection) bool {
for _, p := range m.getRTPParametersByKind(typ, directions).Codecs {
if strings.Contains(p.MimeType, MimeTypeFlexFEC) {
return true
}
}
return false
}