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mediasoup-client: Chrome74 vs Chrome111

Created 2 years agoDiff never expires

1012 lines

1024 lines

import * as sdpTransform from 'sdp-transform';

import { Logger } from '../Logger';

import * as utils from '../utils';

import * as ortc from '../ortc';

import * as sdpCommonUtils from './sdp/commonUtils';

import * as sdpUnifiedPlanUtils from './sdp/unifiedPlanUtils';

import {

HandlerFactory,

HandlerInterface,

HandlerRunOptions,

HandlerSendOptions,

HandlerSendResult,

HandlerReceiveOptions,

HandlerReceiveResult,

HandlerSendDataChannelOptions,

HandlerSendDataChannelResult,

HandlerReceiveDataChannelOptions,

HandlerReceiveDataChannelResult

} from './HandlerInterface';

import { RemoteSdp } from './sdp/RemoteSdp';

import { parse as parseScalabilityMode } from '../scalabilityModes';

import { IceParameters, DtlsRole } from '../Transport';

import {

RtpCapabilities,

RtpParameters,

RtpEncodingParameters

} from '../RtpParameters';

import { SctpCapabilities, SctpStreamParameters } from '../SctpParameters';

const logger = new Logger('Chrome74');

const logger = new Logger('Chrome111');

const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };

export class Chrome74 extends HandlerInterface

export class Chrome111 extends HandlerInterface

{

// Handler direction.

private _direction?: 'send' | 'recv';

// Remote SDP handler.

private _remoteSdp?: RemoteSdp;

// Generic sending RTP parameters for audio and video.

private _sendingRtpParametersByKind?: { [key: string]: RtpParameters };

// Generic sending RTP parameters for audio and video suitable for the SDP

// remote answer.

private _sendingRemoteRtpParametersByKind?: { [key: string]: RtpParameters };

// Initial server side DTLS role. If not 'auto', it will force the opposite

// value in client side.

private _forcedLocalDtlsRole?: DtlsRole;

// RTCPeerConnection instance.

private _pc: any;

// Map of RTCTransceivers indexed by MID.

private readonly _mapMidTransceiver: Map<string, RTCRtpTransceiver> =

new Map();

// Local stream for sending.

private readonly _sendStream = new MediaStream();

// Whether a DataChannel m=application section has been created.

private _hasDataChannelMediaSection = false;

// Sending DataChannel id value counter. Incremented for each new DataChannel.

private _nextSendSctpStreamId = 0;

// Got transport local and remote parameters.

private _transportReady = false;

/**

* Creates a factory function.

static createFactory(): HandlerFactory

{

return (): Chrome74 => new Chrome74();

return (): Chrome111 => new Chrome111();

}

constructor()

{

super();

}

get name(): string

{

return 'Chrome74';

return 'Chrome111';

}

close(): void

{

logger.debug('close()');

// Close RTCPeerConnection.

if (this._pc)

{

try { this._pc.close(); }

catch (error) {}

}

this.emit('@close');

}

async getNativeRtpCapabilities(): Promise<RtpCapabilities>

{

logger.debug('getNativeRtpCapabilities()');

const pc = new (RTCPeerConnection as any)(

{

iceServers : [],

iceTransportPolicy : 'all',

bundlePolicy : 'max-bundle',

rtcpMuxPolicy : 'require',

sdpSemantics : 'unified-plan'

});

try

{

pc.addTransceiver('audio');

pc.addTransceiver('video');

const offer = await pc.createOffer();

try { pc.close(); }

catch (error) {}

const sdpObject = sdpTransform.parse(offer.sdp);

const nativeRtpCapabilities =

sdpCommonUtils.extractRtpCapabilities({ sdpObject });

return nativeRtpCapabilities;

}

catch (error)

{

try { pc.close(); }

catch (error2) {}

throw error;

}

async getNativeSctpCapabilities(): Promise<SctpCapabilities>

{

logger.debug('getNativeSctpCapabilities()');

return {

numStreams : SCTP_NUM_STREAMS

};

}

run(

{

direction,

iceParameters,

iceCandidates,

dtlsParameters,

sctpParameters,

iceServers,

iceTransportPolicy,

additionalSettings,

proprietaryConstraints,

extendedRtpCapabilities

}: HandlerRunOptions

): void

{

logger.debug('run()');

this._direction = direction;

this._remoteSdp = new RemoteSdp(

{

iceParameters,

iceCandidates,

dtlsParameters,

sctpParameters

});

this._sendingRtpParametersByKind =

{

audio : ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),

video : ortc.getSendingRtpParameters('video', extendedRtpCapabilities)

};

this._sendingRemoteRtpParametersByKind =

{

audio : ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),

video : ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)

};

if (dtlsParameters.role && dtlsParameters.role !== 'auto')

{

this._forcedLocalDtlsRole = dtlsParameters.role === 'server'

? 'client'

: 'server';

}

this._pc = new (RTCPeerConnection as any)(

{

iceServers : iceServers || [],

iceTransportPolicy : iceTransportPolicy || 'all',

bundlePolicy : 'max-bundle',

rtcpMuxPolicy : 'require',

sdpSemantics : 'unified-plan',

...additionalSettings

proprietaryConstraints);

if (this._pc.connectionState)

{

this._pc.addEventListener('connectionstatechange', () =>

{

this.emit('@connectionstatechange', this._pc.connectionState);

});

}

else

{

logger.warn(

'run() | pc.connectionState not supported, using pc.iceConnectionState');

this._pc.addEventListener('iceconnectionstatechange', () =>

{

switch (this._pc.iceConnectionState)

{

case 'checking':

this.emit('@connectionstatechange', 'connecting');

break;

case 'connected':

case 'completed':

this.emit('@connectionstatechange', 'connected');

break;

case 'failed':

this.emit('@connectionstatechange', 'failed');

break;

case 'disconnected':

this.emit('@connectionstatechange', 'disconnected');

break;

case 'closed':

this.emit('@connectionstatechange', 'closed');

break;

}

});

}

async updateIceServers(iceServers: RTCIceServer[]): Promise<void>

{

logger.debug('updateIceServers()');

const configuration = this._pc.getConfiguration();

configuration.iceServers = iceServers;

this._pc.setConfiguration(configuration);

}

async restartIce(iceParameters: IceParameters): Promise<void>

{

logger.debug('restartIce()');

// Provide the remote SDP handler with new remote ICE parameters.

this._remoteSdp!.updateIceParameters(iceParameters);

if (!this._transportReady)

return;

if (this._direction === 'send')

{

const offer = await this._pc.createOffer({ iceRestart: true });

logger.debug(

'restartIce() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'restartIce() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

}

else

{

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'restartIce() | calling pc.setRemoteDescription() [offer:%o]',

offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(

'restartIce() | calling pc.setLocalDescription() [answer:%o]',

answer);

await this._pc.setLocalDescription(answer);

}

async getTransportStats(): Promise<RTCStatsReport>

{

return this._pc.getStats();

}

async send(

{ track, encodings, codecOptions, codec }: HandlerSendOptions

): Promise<HandlerSendResult>

{

this.assertSendDirection();

logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);

if (encodings && encodings.length > 1)

{

encodings.forEach((encoding: RtpEncodingParameters, idx: number) =>

{

encoding.rid = `r${idx}`;

});

}

const sendingRtpParameters =

utils.clone(this._sendingRtpParametersByKind![track.kind], {});

// This may throw.

sendingRtpParameters.codecs =

ortc.reduceCodecs(sendingRtpParameters.codecs, codec);

const sendingRemoteRtpParameters =

utils.clone(this._sendingRemoteRtpParametersByKind![track.kind], {});

// This may throw.

sendingRemoteRtpParameters.codecs =

ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);

const mediaSectionIdx = this._remoteSdp!.getNextMediaSectionIdx();

const transceiver = this._pc.addTransceiver(

track,

{

direction : 'sendonly',

streams : [ this._sendStream ],

sendEncodings : encodings

});

let offer = await this._pc.createOffer();

const offer = await this._pc.createOffer();

let localSdpObject = sdpTransform.parse(offer.sdp);

let offerMediaObject;

if (!this._transportReady)

{

await this.setupTransport(

{

localDtlsRole : this._forcedLocalDtlsRole ?? 'client',

localSdpObject

});

}

// Special case for VP9 with SVC.

let hackVp9Svc = false;

const layers =

parseScalabilityMode((encodings || [ {} ])[0].scalabilityMode);

if (

encodings &&

encodings.length === 1 &&

layers.spatialLayers > 1 &&

sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9'

)

{

logger.debug('send() | enabling legacy simulcast for VP9 SVC');

hackVp9Svc = true;

localSdpObject = sdpTransform.parse(offer.sdp);

offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];

sdpUnifiedPlanUtils.addLegacySimulcast(

{

offerMediaObject,

numStreams : layers.spatialLayers

});

offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };

}

logger.debug(

'send() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

// We can now get the transceiver.mid.

const localId = transceiver.mid;

// Set MID.

sendingRtpParameters.mid = localId;

localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);

offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];

const offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];

// Set RTCP CNAME.

sendingRtpParameters.rtcp.cname =

sdpCommonUtils.getCname({ offerMediaObject });

// Set RTP encodings by parsing the SDP offer if no encodings are given.

if (!encodings)

{

sendingRtpParameters.encodings =

sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });

}

// Set RTP encodings by parsing the SDP offer and complete them with given

// one if just a single encoding has been given.

else if (encodings.length === 1)

{

let newEncodings =

const newEncodings =

sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });

Object.assign(newEncodings[0], encodings[0]);

// Hack for VP9 SVC.

if (hackVp9Svc)

newEncodings = [ newEncodings[0] ];

sendingRtpParameters.encodings = newEncodings;

}

// Otherwise if more than 1 encoding are given use them verbatim.

else

{

sendingRtpParameters.encodings = encodings;

}

// If VP8 or H264 and there is effective simulcast, add scalabilityMode to

// each encoding.

if (

sendingRtpParameters.encodings.length > 1 &&

(

sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||

sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264'

)

{

for (const encoding of sendingRtpParameters.encodings)

{

if (encoding.scalabilityMode)

{

encoding.scalabilityMode = `L1T${layers.temporalLayers}`;

}

else

{

// By default Chrome enables 2 temporal layers (not in all OS but

// anyway).

encoding.scalabilityMode = 'L1T2';

}

this._remoteSdp!.send(

{

offerMediaObject,

reuseMid : mediaSectionIdx.reuseMid,

offerRtpParameters : sendingRtpParameters,

answerRtpParameters : sendingRemoteRtpParameters,

codecOptions,

extmapAllowMixed : true

});

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'send() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

// Store in the map.

this._mapMidTransceiver.set(localId, transceiver);

return {

localId,

rtpParameters : sendingRtpParameters,

rtpSender : transceiver.sender

};

}

async stopSending(localId: string): Promise<void>

{

this.assertSendDirection();

logger.debug('stopSending() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

transceiver.sender.replaceTrack(null);

this._pc.removeTrack(transceiver.sender);

const mediaSectionClosed =

this._remoteSdp!.closeMediaSection(transceiver.mid!);

if (mediaSectionClosed)

{

try

{

transceiver.stop();

}

catch (error)

{}

}

const offer = await this._pc.createOffer();

logger.debug(

'stopSending() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'stopSending() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

this._mapMidTransceiver.delete(localId);

}

async pauseSending(localId: string): Promise<void>

{

this.assertSendDirection();

logger.debug('pauseSending() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'inactive';

this._remoteSdp!.pauseMediaSection(localId);

const offer = await this._pc.createOffer();

logger.debug(

'pauseSending() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'pauseSending() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

}

async resumeSending(localId: string): Promise<void>

{

this.assertSendDirection();

logger.debug('resumeSending() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

this._remoteSdp!.resumeSendingMediaSection(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'sendonly';

const offer = await this._pc.createOffer();

logger.debug(

'resumeSending() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'resumeSending() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

}

async replaceTrack(

localId: string, track: MediaStreamTrack | null

): Promise<void>

{

this.assertSendDirection();

if (track)

{

logger.debug(

'replaceTrack() [localId:%s, track.id:%s]', localId, track.id);

}

else

{

logger.debug('replaceTrack() [localId:%s, no track]', localId);

}

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

await transceiver.sender.replaceTrack(track);

}

async setMaxSpatialLayer(localId: string, spatialLayer: number): Promise<void>

{

this.assertSendDirection();

logger.debug(

'setMaxSpatialLayer() [localId:%s, spatialLayer:%s]',

localId, spatialLayer);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

const parameters = transceiver.sender.getParameters();

parameters.encodings.forEach((encoding: RTCRtpEncodingParameters, idx: number) =>

{

if (idx <= spatialLayer)

encoding.active = true;

else

encoding.active = false;

});

await transceiver.sender.setParameters(parameters);

this._remoteSdp!.muxMediaSectionSimulcast(localId, parameters.encodings);

const offer = await this._pc.createOffer();

logger.debug(

'setMaxSpatialLayer() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'setMaxSpatialLayer() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

}

async setRtpEncodingParameters(localId: string, params: any): Promise<void>

{

this.assertSendDirection();

logger.debug(

'setRtpEncodingParameters() [localId:%s, params:%o]',

localId, params);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

const parameters = transceiver.sender.getParameters();

parameters.encodings.forEach((encoding: RTCRtpEncodingParameters, idx: number) =>

{

parameters.encodings[idx] = { ...encoding, ...params };

});

await transceiver.sender.setParameters(parameters);

this._remoteSdp!.muxMediaSectionSimulcast(localId, parameters.encodings);

const offer = await this._pc.createOffer();

logger.debug(

'setRtpEncodingParameters() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'setRtpEncodingParameters() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

}

async getSenderStats(localId: string): Promise<RTCStatsReport>

{

this.assertSendDirection();

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

return transceiver.sender.getStats();

}

async sendDataChannel(

{

ordered,

maxPacketLifeTime,

maxRetransmits,

label,

protocol

}: HandlerSendDataChannelOptions

): Promise<HandlerSendDataChannelResult>

{

this.assertSendDirection();

const options =

{

negotiated : true,

id : this._nextSendSctpStreamId,

ordered,

maxPacketLifeTime,

maxRetransmits,

protocol

};

logger.debug('sendDataChannel() [options:%o]', options);

const dataChannel = this._pc.createDataChannel(label, options);

// Increase next id.

this._nextSendSctpStreamId =

++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;

// If this is the first DataChannel we need to create the SDP answer with

// m=application section.

if (!this._hasDataChannelMediaSection)

{

const offer = await this._pc.createOffer();

const localSdpObject = sdpTransform.parse(offer.sdp);

const offerMediaObject = localSdpObject.media

.find((m: any) => m.type === 'application');

if (!this._transportReady)

{

await this.setupTransport(

{

localDtlsRole : this._forcedLocalDtlsRole ?? 'client',

localSdpObject

});

}

logger.debug(

'sendDataChannel() | calling pc.setLocalDescription() [offer:%o]',

offer);

await this._pc.setLocalDescription(offer);

this._remoteSdp!.sendSctpAssociation({ offerMediaObject });

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setRemoteDescription(answer);

this._hasDataChannelMediaSection = true;

}

const sctpStreamParameters: SctpStreamParameters =

{

streamId : options.id,

ordered : options.ordered,

maxPacketLifeTime : options.maxPacketLifeTime,

maxRetransmits : options.maxRetransmits

};

return { dataChannel, sctpStreamParameters };

}

async receive(

optionsList: HandlerReceiveOptions[]

) : Promise<HandlerReceiveResult[]>

{

this.assertRecvDirection();

const results: HandlerReceiveResult[] = [];

const mapLocalId: Map<string, string> = new Map();

for (const options of optionsList)

{

const { trackId, kind, rtpParameters, streamId } = options;

logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);

const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);

mapLocalId.set(trackId, localId);

this._remoteSdp!.receive(

{

mid : localId,

kind,

offerRtpParameters : rtpParameters,

streamId : streamId || rtpParameters.rtcp!.cname!,

trackId

});

}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'receive() | calling pc.setRemoteDescription() [offer:%o]',

offer);

await this._pc.setRemoteDescription(offer);

let answer = await this._pc.createAnswer();

const localSdpObject = sdpTransform.parse(answer.sdp);

for (const options of optionsList)

{

const { trackId, rtpParameters } = options;

const localId = mapLocalId.get(trackId);

const answerMediaObject = localSdpObject.media

.find((m: any) => String(m.mid) === localId);

// May need to modify codec parameters in the answer based on codec

// parameters in the offer.

sdpCommonUtils.applyCodecParameters(

{

offerRtpParameters : rtpParameters,

answerMediaObject

});

}

answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };

if (!this._transportReady)

{

await this.setupTransport(

{

localDtlsRole : this._forcedLocalDtlsRole ?? 'client',

localSdpObject

});

}

logger.debug(

'receive() | calling pc.setLocalDescription() [answer:%o]',

answer);

await this._pc.setLocalDescription(answer);

for (const options of optionsList)

{

const { trackId } = options;

const localId = mapLocalId.get(trackId)!;

const transceiver = this._pc.getTransceivers()

.find((t: RTCRtpTransceiver) => t.mid === localId);

if (!transceiver)

{

throw new Error('new RTCRtpTransceiver not found');

}

else

{

// Store in the map.

this._mapMidTransceiver.set(localId, transceiver);

results.push({

localId,

track : transceiver.receiver.track,

rtpReceiver : transceiver.receiver

});

}

return results;

}

async stopReceiving(localIds: string[]): Promise<void>

{

this.assertRecvDirection();

for (const localId of localIds)

{

logger.debug('stopReceiving() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

this._remoteSdp!.closeMediaSection(transceiver.mid!);

}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'stopReceiving() | calling pc.setRemoteDescription() [offer:%o]',

offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(

'stopReceiving() | calling pc.setLocalDescription() [answer:%o]',

answer);

await this._pc.setLocalDescription(answer);

for (const localId of localIds)

{

this._mapMidTransceiver.delete(localId);

}

async pauseReceiving(localIds: string[]): Promise<void>

{

this.assertRecvDirection();

for (const localId of localIds)

{

logger.debug('pauseReceiving() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'inactive';

this._remoteSdp!.pauseMediaSection(localId);

}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'pauseReceiving() | calling pc.setRemoteDescription() [offer:%o]',

offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(

'pauseReceiving() | calling pc.setLocalDescription() [answer:%o]',

answer);

await this._pc.setLocalDescription(answer);

}

async resumeReceiving(localIds: string[]): Promise<void>

{

this.assertRecvDirection();

for (const localId of localIds)

{

logger.debug('resumeReceiving() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'recvonly';

this._remoteSdp!.resumeReceivingMediaSection(localId);

}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'resumeReceiving() | calling pc.setRemoteDescription() [offer:%o]',

offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(

'resumeReceiving() | calling pc.setLocalDescription() [answer:%o]',

answer);

await this._pc.setLocalDescription(answer);

}

async getReceiverStats(localId: string): Promise<RTCStatsReport>

{

this.assertRecvDirection();

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)

throw new Error('associated RTCRtpTransceiver not found');

return transceiver.receiver.getStats();

}

async receiveDataChannel(

{ sctpStreamParameters, label, protocol }: HandlerReceiveDataChannelOptions

): Promise<HandlerReceiveDataChannelResult>

{

this.assertRecvDirection();

const {

streamId,

ordered,

maxPacketLifeTime,

maxRetransmits

}: SctpStreamParameters = sctpStreamParameters;

const options =

{

negotiated : true,

id : streamId,

ordered,

maxPacketLifeTime,

maxRetransmits,

protocol

};

logger.debug('receiveDataChannel() [options:%o]', options);

const dataChannel = this._pc.createDataChannel(label, options);

// If this is the first DataChannel we need to create the SDP offer with

// m=application section.

if (!this._hasDataChannelMediaSection)

{

this._remoteSdp!.receiveSctpAssociation();

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(

'receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]',

offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

if (!this._transportReady)

{

const localSdpObject = sdpTransform.parse(answer.sdp);

await this.setupTransport(

{

localDtlsRole : this._forcedLocalDtlsRole ?? 'client',

localSdpObject

});

}

logger.debug(

'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',

answer);

await this._pc.setLocalDescription(answer);

this._hasDataChannelMediaSection = true;

}

return { dataChannel };

}

private async setupTransport(

{

localDtlsRole,

localSdpObject

{

localDtlsRole: DtlsRole;

localSdpObject?: any;

}

): Promise<void>

{

if (!localSdpObject)

localSdpObject = sdpTransform.parse(this._pc.localD

सेव किए गए Diffs

ऑरिजनल टेक्स्ट

फ़ाइल खोलें

import * as sdpTransform from 'sdp-transform';
import { Logger } from '../Logger';
import * as utils from '../utils';
import * as ortc from '../ortc';
import * as sdpCommonUtils from './sdp/commonUtils';
import * as sdpUnifiedPlanUtils from './sdp/unifiedPlanUtils';
import {
	HandlerFactory,
	HandlerInterface,
	HandlerRunOptions,
	HandlerSendOptions,
	HandlerSendResult,
	HandlerReceiveOptions,
	HandlerReceiveResult,
	HandlerSendDataChannelOptions,
	HandlerSendDataChannelResult,
	HandlerReceiveDataChannelOptions,
	HandlerReceiveDataChannelResult
} from './HandlerInterface';
import { RemoteSdp } from './sdp/RemoteSdp';
import { parse as parseScalabilityMode } from '../scalabilityModes';
import { IceParameters, DtlsRole } from '../Transport';
import {
	RtpCapabilities,
	RtpParameters,
	RtpEncodingParameters
} from '../RtpParameters';
import { SctpCapabilities, SctpStreamParameters } from '../SctpParameters';

const logger = new Logger('Chrome74');

const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };

export class Chrome74 extends HandlerInterface
{
	// Handler direction.
	private _direction?: 'send' | 'recv';
	// Remote SDP handler.
	private _remoteSdp?: RemoteSdp;
	// Generic sending RTP parameters for audio and video.
	private _sendingRtpParametersByKind?: { [key: string]: RtpParameters };
	// Generic sending RTP parameters for audio and video suitable for the SDP
	// remote answer.
	private _sendingRemoteRtpParametersByKind?: { [key: string]: RtpParameters };
	// Initial server side DTLS role. If not 'auto', it will force the opposite
	// value in client side.
	private _forcedLocalDtlsRole?: DtlsRole;
	// RTCPeerConnection instance.
	private _pc: any;
	// Map of RTCTransceivers indexed by MID.
	private readonly _mapMidTransceiver: Map<string, RTCRtpTransceiver> =
		new Map();
	// Local stream for sending.
	private readonly _sendStream = new MediaStream();
	// Whether a DataChannel m=application section has been created.
	private _hasDataChannelMediaSection = false;
	// Sending DataChannel id value counter. Incremented for each new DataChannel.
	private _nextSendSctpStreamId = 0;
	// Got transport local and remote parameters.
	private _transportReady = false;

/**
	 * Creates a factory function.
	 */
	static createFactory(): HandlerFactory
	{
		return (): Chrome74 => new Chrome74();
	}

constructor()
	{
		super();
	}

get name(): string
	{
		return 'Chrome74';
	}

close(): void
	{
		logger.debug('close()');

// Close RTCPeerConnection.
		if (this._pc)
		{
			try { this._pc.close(); }
			catch (error) {}
		}

this.emit('@close');
	}

async getNativeRtpCapabilities(): Promise<RtpCapabilities>
	{
		logger.debug('getNativeRtpCapabilities()');

const pc = new (RTCPeerConnection as any)(
			{
				iceServers         : [],
				iceTransportPolicy : 'all',
				bundlePolicy       : 'max-bundle',
				rtcpMuxPolicy      : 'require',
				sdpSemantics       : 'unified-plan'
			});

try
		{
			pc.addTransceiver('audio');
			pc.addTransceiver('video');

const offer = await pc.createOffer();

try { pc.close(); }
			catch (error) {}

const sdpObject = sdpTransform.parse(offer.sdp);
			const nativeRtpCapabilities =
				sdpCommonUtils.extractRtpCapabilities({ sdpObject });

return nativeRtpCapabilities;
		}
		catch (error)
		{
			try { pc.close(); }
			catch (error2) {}

throw error;
		}
	}

async getNativeSctpCapabilities(): Promise<SctpCapabilities>
	{
		logger.debug('getNativeSctpCapabilities()');

return {
			numStreams : SCTP_NUM_STREAMS
		};
	}

run(
		{
			direction,
			iceParameters,
			iceCandidates,
			dtlsParameters,
			sctpParameters,
			iceServers,
			iceTransportPolicy,
			additionalSettings,
			proprietaryConstraints,
			extendedRtpCapabilities
		}: HandlerRunOptions
	): void
	{
		logger.debug('run()');

this._direction = direction;

this._remoteSdp = new RemoteSdp(
			{
				iceParameters,
				iceCandidates,
				dtlsParameters,
				sctpParameters
			});

this._sendingRtpParametersByKind =
		{
			audio : ortc.getSendingRtpParameters('audio', extendedRtpCapabilities),
			video : ortc.getSendingRtpParameters('video', extendedRtpCapabilities)
		};

this._sendingRemoteRtpParametersByKind =
		{
			audio : ortc.getSendingRemoteRtpParameters('audio', extendedRtpCapabilities),
			video : ortc.getSendingRemoteRtpParameters('video', extendedRtpCapabilities)
		};

if (dtlsParameters.role && dtlsParameters.role !== 'auto')
		{
			this._forcedLocalDtlsRole = dtlsParameters.role === 'server'
				? 'client'
				: 'server';
		}

this._pc = new (RTCPeerConnection as any)(
			{
				iceServers         : iceServers || [],
				iceTransportPolicy : iceTransportPolicy || 'all',
				bundlePolicy       : 'max-bundle',
				rtcpMuxPolicy      : 'require',
				sdpSemantics       : 'unified-plan',
				...additionalSettings
			},
			proprietaryConstraints);

if (this._pc.connectionState)
		{
			this._pc.addEventListener('connectionstatechange', () =>
			{
				this.emit('@connectionstatechange', this._pc.connectionState);
			});
		}
		else
		{
			logger.warn(
				'run() | pc.connectionState not supported, using pc.iceConnectionState');

this._pc.addEventListener('iceconnectionstatechange', () =>
			{
				switch (this._pc.iceConnectionState)
				{
					case 'checking':
						this.emit('@connectionstatechange', 'connecting');
						break;
					case 'connected':
					case 'completed':
						this.emit('@connectionstatechange', 'connected');
						break;
					case 'failed':
						this.emit('@connectionstatechange', 'failed');
						break;
					case 'disconnected':
						this.emit('@connectionstatechange', 'disconnected');
						break;
					case 'closed':
						this.emit('@connectionstatechange', 'closed');
						break;
				}
			});
		}
	}

async updateIceServers(iceServers: RTCIceServer[]): Promise<void>
	{
		logger.debug('updateIceServers()');

const configuration = this._pc.getConfiguration();

configuration.iceServers = iceServers;

this._pc.setConfiguration(configuration);
	}

async restartIce(iceParameters: IceParameters): Promise<void>
	{
		logger.debug('restartIce()');

// Provide the remote SDP handler with new remote ICE parameters.
		this._remoteSdp!.updateIceParameters(iceParameters);

if (!this._transportReady)
			return;

if (this._direction === 'send')
		{
			const offer = await this._pc.createOffer({ iceRestart: true });

logger.debug(
				'restartIce() | calling pc.setLocalDescription() [offer:%o]',
				offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
				'restartIce() | calling pc.setRemoteDescription() [answer:%o]',
				answer);

await this._pc.setRemoteDescription(answer);
		}
		else
		{
			const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
				'restartIce() | calling pc.setRemoteDescription() [offer:%o]',
				offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(
				'restartIce() | calling pc.setLocalDescription() [answer:%o]',
				answer);

await this._pc.setLocalDescription(answer);
		}
	}

async getTransportStats(): Promise<RTCStatsReport>
	{
		return this._pc.getStats();
	}

async send(
		{ track, encodings, codecOptions, codec }: HandlerSendOptions
	): Promise<HandlerSendResult>
	{
		this.assertSendDirection();

logger.debug('send() [kind:%s, track.id:%s]', track.kind, track.id);

if (encodings && encodings.length > 1)
		{
			encodings.forEach((encoding: RtpEncodingParameters, idx: number) =>
			{
				encoding.rid = `r${idx}`;
			});
		}

const sendingRtpParameters =
			utils.clone(this._sendingRtpParametersByKind![track.kind], {});

// This may throw.
		sendingRtpParameters.codecs =
			ortc.reduceCodecs(sendingRtpParameters.codecs, codec);

const sendingRemoteRtpParameters =
			utils.clone(this._sendingRemoteRtpParametersByKind![track.kind], {});

// This may throw.
		sendingRemoteRtpParameters.codecs =
			ortc.reduceCodecs(sendingRemoteRtpParameters.codecs, codec);

const mediaSectionIdx = this._remoteSdp!.getNextMediaSectionIdx();
		const transceiver = this._pc.addTransceiver(
			track,
			{
				direction     : 'sendonly',
				streams       : [ this._sendStream ],
				sendEncodings : encodings
			});
		let offer = await this._pc.createOffer();
		let localSdpObject = sdpTransform.parse(offer.sdp);
		let offerMediaObject;

if (!this._transportReady)
		{
			await this.setupTransport(
				{
					localDtlsRole : this._forcedLocalDtlsRole ?? 'client',
					localSdpObject
				});
		}

// Special case for VP9 with SVC.
		let hackVp9Svc = false;

const layers =
			parseScalabilityMode((encodings || [ {} ])[0].scalabilityMode);

if (
			encodings &&
			encodings.length === 1 &&
			layers.spatialLayers > 1 &&
			sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp9'
		)
		{
			logger.debug('send() | enabling legacy simulcast for VP9 SVC');

hackVp9Svc = true;
			localSdpObject = sdpTransform.parse(offer.sdp);
			offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];

sdpUnifiedPlanUtils.addLegacySimulcast(
				{
					offerMediaObject,
					numStreams : layers.spatialLayers
				});

offer = { type: 'offer', sdp: sdpTransform.write(localSdpObject) };
		}

logger.debug(
			'send() | calling pc.setLocalDescription() [offer:%o]',
			offer);

await this._pc.setLocalDescription(offer);

// We can now get the transceiver.mid.
		const localId = transceiver.mid;

// Set MID.
		sendingRtpParameters.mid = localId;

localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);
		offerMediaObject = localSdpObject.media[mediaSectionIdx.idx];

// Set RTCP CNAME.
		sendingRtpParameters.rtcp.cname =
			sdpCommonUtils.getCname({ offerMediaObject });

// Set RTP encodings by parsing the SDP offer if no encodings are given.
		if (!encodings)
		{
			sendingRtpParameters.encodings =
				sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });
		}
		// Set RTP encodings by parsing the SDP offer and complete them with given
		// one if just a single encoding has been given.
		else if (encodings.length === 1)
		{
			let newEncodings =
				sdpUnifiedPlanUtils.getRtpEncodings({ offerMediaObject });

Object.assign(newEncodings[0], encodings[0]);

// Hack for VP9 SVC.
			if (hackVp9Svc)
				newEncodings = [ newEncodings[0] ];

sendingRtpParameters.encodings = newEncodings;
		}
		// Otherwise if more than 1 encoding are given use them verbatim.
		else
		{
			sendingRtpParameters.encodings = encodings;
		}

// If VP8 or H264 and there is effective simulcast, add scalabilityMode to
		// each encoding.
		if (
			sendingRtpParameters.encodings.length > 1 &&
			(
				sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/vp8' ||
				sendingRtpParameters.codecs[0].mimeType.toLowerCase() === 'video/h264'
			)
		)
		{
			for (const encoding of sendingRtpParameters.encodings)
			{
				if (encoding.scalabilityMode)
				{
					encoding.scalabilityMode = `L1T${layers.temporalLayers}`;
				}
				else
				{
					// By default Chrome enables 2 temporal layers (not in all OS but
					// anyway).
					encoding.scalabilityMode = 'L1T2';
				}
			}
		}

this._remoteSdp!.send(
			{
				offerMediaObject,
				reuseMid            : mediaSectionIdx.reuseMid,
				offerRtpParameters  : sendingRtpParameters,
				answerRtpParameters : sendingRemoteRtpParameters,
				codecOptions,
				extmapAllowMixed    : true
			});

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'send() | calling pc.setRemoteDescription() [answer:%o]',
			answer);

await this._pc.setRemoteDescription(answer);

// Store in the map.
		this._mapMidTransceiver.set(localId, transceiver);

return {
			localId,
			rtpParameters : sendingRtpParameters,
			rtpSender     : transceiver.sender
		};
	}

async stopSending(localId: string): Promise<void>
	{
		this.assertSendDirection();

logger.debug('stopSending() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

transceiver.sender.replaceTrack(null);

this._pc.removeTrack(transceiver.sender);

const mediaSectionClosed =
			this._remoteSdp!.closeMediaSection(transceiver.mid!);

if (mediaSectionClosed)
		{
			try
			{
				transceiver.stop();
			}
			catch (error)
			{}
		}

const offer = await this._pc.createOffer();

logger.debug(
			'stopSending() | calling pc.setLocalDescription() [offer:%o]',
			offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'stopSending() | calling pc.setRemoteDescription() [answer:%o]',
			answer);

await this._pc.setRemoteDescription(answer);

this._mapMidTransceiver.delete(localId);
	}

async pauseSending(localId: string): Promise<void>
	{
		this.assertSendDirection();

logger.debug('pauseSending() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'inactive';
		this._remoteSdp!.pauseMediaSection(localId);

const offer = await this._pc.createOffer();

logger.debug(
			'pauseSending() | calling pc.setLocalDescription() [offer:%o]',
			offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'pauseSending() | calling pc.setRemoteDescription() [answer:%o]',
			answer);

await this._pc.setRemoteDescription(answer);
	}

async resumeSending(localId: string): Promise<void>
	{
		this.assertSendDirection();

logger.debug('resumeSending() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

this._remoteSdp!.resumeSendingMediaSection(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'sendonly';

const offer = await this._pc.createOffer();

logger.debug(
			'resumeSending() | calling pc.setLocalDescription() [offer:%o]',
			offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'resumeSending() | calling pc.setRemoteDescription() [answer:%o]',
			answer);

await this._pc.setRemoteDescription(answer);
	}

async replaceTrack(
		localId: string, track: MediaStreamTrack | null
	): Promise<void>
	{
		this.assertSendDirection();

if (track)
		{
			logger.debug(
				'replaceTrack() [localId:%s, track.id:%s]', localId, track.id);
		}
		else
		{
			logger.debug('replaceTrack() [localId:%s, no track]', localId);
		}

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

await transceiver.sender.replaceTrack(track);
	}

async setMaxSpatialLayer(localId: string, spatialLayer: number): Promise<void>
	{
		this.assertSendDirection();

logger.debug(
			'setMaxSpatialLayer() [localId:%s, spatialLayer:%s]',
			localId, spatialLayer);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

const parameters = transceiver.sender.getParameters();

parameters.encodings.forEach((encoding: RTCRtpEncodingParameters, idx: number) =>
		{
			if (idx <= spatialLayer)
				encoding.active = true;
			else
				encoding.active = false;
		});

await transceiver.sender.setParameters(parameters);

this._remoteSdp!.muxMediaSectionSimulcast(localId, parameters.encodings);

const offer = await this._pc.createOffer();

logger.debug(
			'setMaxSpatialLayer() | calling pc.setLocalDescription() [offer:%o]',
			offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'setMaxSpatialLayer() | calling pc.setRemoteDescription() [answer:%o]',
			answer);

await this._pc.setRemoteDescription(answer);
	}

async setRtpEncodingParameters(localId: string, params: any): Promise<void>
	{
		this.assertSendDirection();

logger.debug(
			'setRtpEncodingParameters() [localId:%s, params:%o]',
			localId, params);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

const parameters = transceiver.sender.getParameters();

parameters.encodings.forEach((encoding: RTCRtpEncodingParameters, idx: number) =>
		{
			parameters.encodings[idx] = { ...encoding, ...params };
		});

await transceiver.sender.setParameters(parameters);

this._remoteSdp!.muxMediaSectionSimulcast(localId, parameters.encodings);

const offer = await this._pc.createOffer();

logger.debug(
			'setRtpEncodingParameters() | calling pc.setLocalDescription() [offer:%o]',
			offer);

await this._pc.setLocalDescription(offer);

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'setRtpEncodingParameters() | calling pc.setRemoteDescription() [answer:%o]',
			answer);

await this._pc.setRemoteDescription(answer);
	}

async getSenderStats(localId: string): Promise<RTCStatsReport>
	{
		this.assertSendDirection();

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

return transceiver.sender.getStats();
	}

async sendDataChannel(
		{
			ordered,
			maxPacketLifeTime,
			maxRetransmits,
			label,
			protocol
		}: HandlerSendDataChannelOptions
	): Promise<HandlerSendDataChannelResult>
	{
		this.assertSendDirection();

const options =
		{
			negotiated : true,
			id         : this._nextSendSctpStreamId,
			ordered,
			maxPacketLifeTime,
			maxRetransmits,
			protocol
		};

logger.debug('sendDataChannel() [options:%o]', options);

const dataChannel = this._pc.createDataChannel(label, options);

// Increase next id.
		this._nextSendSctpStreamId =
			++this._nextSendSctpStreamId % SCTP_NUM_STREAMS.MIS;

// If this is the first DataChannel we need to create the SDP answer with
		// m=application section.
		if (!this._hasDataChannelMediaSection)
		{
			const offer = await this._pc.createOffer();
			const localSdpObject = sdpTransform.parse(offer.sdp);
			const offerMediaObject = localSdpObject.media
				.find((m: any) => m.type === 'application');

if (!this._transportReady)
			{
				await this.setupTransport(
					{
						localDtlsRole : this._forcedLocalDtlsRole ?? 'client',
						localSdpObject
					});
			}

logger.debug(
				'sendDataChannel() | calling pc.setLocalDescription() [offer:%o]',
				offer);

await this._pc.setLocalDescription(offer);

this._remoteSdp!.sendSctpAssociation({ offerMediaObject });

const answer = { type: 'answer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
				'sendDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
				answer);

await this._pc.setRemoteDescription(answer);

this._hasDataChannelMediaSection = true;
		}

const sctpStreamParameters: SctpStreamParameters =
		{
			streamId          : options.id,
			ordered           : options.ordered,
			maxPacketLifeTime : options.maxPacketLifeTime,
			maxRetransmits    : options.maxRetransmits
		};

return { dataChannel, sctpStreamParameters };
	}

async receive(
		optionsList: HandlerReceiveOptions[]
	) : Promise<HandlerReceiveResult[]>
	{
		this.assertRecvDirection();

const results: HandlerReceiveResult[] = [];
		const mapLocalId: Map<string, string> = new Map();

for (const options of optionsList)
		{
			const { trackId, kind, rtpParameters, streamId } = options;

logger.debug('receive() [trackId:%s, kind:%s]', trackId, kind);

const localId = rtpParameters.mid || String(this._mapMidTransceiver.size);

mapLocalId.set(trackId, localId);

this._remoteSdp!.receive(
				{
					mid                : localId,
					kind,
					offerRtpParameters : rtpParameters,
					streamId           : streamId || rtpParameters.rtcp!.cname!,
					trackId
				});
		}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'receive() | calling pc.setRemoteDescription() [offer:%o]',
			offer);

await this._pc.setRemoteDescription(offer);

let answer = await this._pc.createAnswer();
		const localSdpObject = sdpTransform.parse(answer.sdp);

for (const options of optionsList)
		{
			const { trackId, rtpParameters } = options;
			const localId = mapLocalId.get(trackId);
			const answerMediaObject = localSdpObject.media
				.find((m: any) => String(m.mid) === localId);

// May need to modify codec parameters in the answer based on codec
			// parameters in the offer.
			sdpCommonUtils.applyCodecParameters(
				{
					offerRtpParameters : rtpParameters,
					answerMediaObject
				});
		}

answer = { type: 'answer', sdp: sdpTransform.write(localSdpObject) };

if (!this._transportReady)
		{
			await this.setupTransport(
				{
					localDtlsRole : this._forcedLocalDtlsRole ?? 'client',
					localSdpObject
				});
		}

logger.debug(
			'receive() | calling pc.setLocalDescription() [answer:%o]',
			answer);

await this._pc.setLocalDescription(answer);

for (const options of optionsList)
		{
			const { trackId } = options;
			const localId = mapLocalId.get(trackId)!;
			const transceiver = this._pc.getTransceivers()
				.find((t: RTCRtpTransceiver) => t.mid === localId);

if (!transceiver)
			{
				throw new Error('new RTCRtpTransceiver not found');
			}
			else
			{
				// Store in the map.
				this._mapMidTransceiver.set(localId, transceiver);

results.push({
					localId,
					track       : transceiver.receiver.track,
					rtpReceiver : transceiver.receiver
				});
			}
		}

return results;
	}

async stopReceiving(localIds: string[]): Promise<void>
	{
		this.assertRecvDirection();

for (const localId of localIds)
		{
			logger.debug('stopReceiving() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
				throw new Error('associated RTCRtpTransceiver not found');

this._remoteSdp!.closeMediaSection(transceiver.mid!);
		}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'stopReceiving() | calling pc.setRemoteDescription() [offer:%o]',
			offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(
			'stopReceiving() | calling pc.setLocalDescription() [answer:%o]',
			answer);

await this._pc.setLocalDescription(answer);

for (const localId of localIds)
		{
			this._mapMidTransceiver.delete(localId);
		}
	}

async pauseReceiving(localIds: string[]): Promise<void>
	{
		this.assertRecvDirection();

for (const localId of localIds)
		{
			logger.debug('pauseReceiving() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
				throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'inactive';
			this._remoteSdp!.pauseMediaSection(localId);
		}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'pauseReceiving() | calling pc.setRemoteDescription() [offer:%o]',
			offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(
			'pauseReceiving() | calling pc.setLocalDescription() [answer:%o]',
			answer);

await this._pc.setLocalDescription(answer);
	}

async resumeReceiving(localIds: string[]): Promise<void>
	{
		this.assertRecvDirection();

for (const localId of localIds)
		{
			logger.debug('resumeReceiving() [localId:%s]', localId);

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
				throw new Error('associated RTCRtpTransceiver not found');

transceiver.direction = 'recvonly';
			this._remoteSdp!.resumeReceivingMediaSection(localId);
		}

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
			'resumeReceiving() | calling pc.setRemoteDescription() [offer:%o]',
			offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

logger.debug(
			'resumeReceiving() | calling pc.setLocalDescription() [answer:%o]',
			answer);

await this._pc.setLocalDescription(answer);
	}

async getReceiverStats(localId: string): Promise<RTCStatsReport>
	{
		this.assertRecvDirection();

const transceiver = this._mapMidTransceiver.get(localId);

if (!transceiver)
			throw new Error('associated RTCRtpTransceiver not found');

return transceiver.receiver.getStats();
	}

async receiveDataChannel(
		{ sctpStreamParameters, label, protocol }: HandlerReceiveDataChannelOptions
	): Promise<HandlerReceiveDataChannelResult>
	{
		this.assertRecvDirection();

const {
			streamId,
			ordered,
			maxPacketLifeTime,
			maxRetransmits
		}: SctpStreamParameters = sctpStreamParameters;

const options =
		{
			negotiated : true,
			id         : streamId,
			ordered,
			maxPacketLifeTime,
			maxRetransmits,
			protocol
		};

logger.debug('receiveDataChannel() [options:%o]', options);

const dataChannel = this._pc.createDataChannel(label, options);

// If this is the first DataChannel we need to create the SDP offer with
		// m=application section.
		if (!this._hasDataChannelMediaSection)
		{
			this._remoteSdp!.receiveSctpAssociation();

const offer = { type: 'offer', sdp: this._remoteSdp!.getSdp() };

logger.debug(
				'receiveDataChannel() | calling pc.setRemoteDescription() [offer:%o]',
				offer);

await this._pc.setRemoteDescription(offer);

const answer = await this._pc.createAnswer();

if (!this._transportReady)
			{
				const localSdpObject = sdpTransform.parse(answer.sdp);

await this.setupTransport(
					{
						localDtlsRole : this._forcedLocalDtlsRole ?? 'client',
						localSdpObject
					});
			}

logger.debug(
				'receiveDataChannel() | calling pc.setRemoteDescription() [answer:%o]',
				answer);

await this._pc.setLocalDescription(answer);

this._hasDataChannelMediaSection = true;
		}

return { dataChannel };
	}

private async setupTransport(
		{
			localDtlsRole,
			localSdpObject
		}:
		{
			localDtlsRole: DtlsRole;
			localSdpObject?: any;
		}
	): Promise<void>
	{
		if (!localSdpObject)
			localSdpObject = sdpTransform.parse(this._pc.localDescription.sdp);

// Get our local DTLS parameters.
		const dtlsParameters =
			sdpCommonUtils.extractDtlsParameters({ sdpObject: localSdpObject });

// Set our DTLS role.
		dtlsParameters.role = localDtlsRole;

// Update the remote DTLS role in the SDP.
		this._remoteSdp!.updateDtlsRole(
			localDtlsRole === 'client' ? 'server' : 'client');

// Need to tell the remote transport about our parameters.
		await new Promise<void>((resolve, reject) =>
		{
			this.safeEmit(
				'@connect',
				{ dtlsParameters },
				resolve,
				reject
			);
		});

this._transportReady = true;
	}

private assertSendDirection(): void
	{
		if (this._direction !== 'send')
		{
			throw new Error(
				'method can just be called for handlers with "send" direction');
		}
	}

private assertRecvDirection(): void
	{
		if (this._direction !== 'recv')
		{
			throw new Error(
				'method can just be called for handlers with "recv" direction');
		}
	}
}

परिवर्तित टेक्स्ट

फ़ाइल खोलें

import * as sdpTransform from 'sdp-transform';
import { Logger } from '../Logger';
import * as utils from '../utils';
import * as ortc from '../ortc';
import * as sdpCommonUtils from './sdp/commonUtils';
import * as sdpUnifiedPlanUtils from './sdp/unifiedPlanUtils';
import {
	HandlerFactory,
	HandlerInterface,
	HandlerRunOptions,
	HandlerSendOptions,
	HandlerSendResult,
	HandlerReceiveOptions,
	HandlerReceiveResult,
	HandlerSendDataChannelOptions,
	HandlerSendDataChannelResult,
	HandlerReceiveDataChannelOptions,
	HandlerReceiveDataChannelResult
} from './HandlerInterface';
import { RemoteSdp } from './sdp/RemoteSdp';
import { IceParameters, DtlsRole } from '../Transport';
import {
	RtpCapabilities,
	RtpParameters,
	RtpEncodingParameters
} from '../RtpParameters';
import { SctpCapabilities, SctpStreamParameters } from '../SctpParameters';

const logger = new Logger('Chrome111');

const SCTP_NUM_STREAMS = { OS: 1024, MIS: 1024 };

export class Chrome111 extends HandlerInterface
{
	// Handler direction.
	private _direction?: 'send' | 'recv';
	// Remote SDP handler.
	private _remoteSdp?: RemoteSdp;
	// Generic sending RTP parameters for audio and video.
	private _sendingRtpParametersByKind?: { [key: string]: RtpParameters };
	// Generic sending RTP parameters for audio and video suitable for the SDP
	// remote answer.
	private _sendingRemoteRtpParametersByKind?: { [key: string]: RtpParameters };
	// Initial server side DTLS role. If not 'auto', it will force the opposite
	// value in client side.
	private _forcedLocalDtlsRole?: DtlsRole;
	// RTCPeerConnection instance.
	private _pc: any;
	// Map of RTCTransceivers indexed by MID.
	private readonly _mapMidTransceiver: Map<string, RTCRtpTransceiver> =
		new Map();
	// Local stream for sending.
	private readonly _sendStream = new MediaStream();
	// Whether a DataChannel m=application section has been created.
	private _hasDataChannelMediaSection = false;
	// Sending DataChannel id value counter. Incremented for each new DataChannel.
	private _nextSendSctpStreamId = 0;
	// Got transport local and remote parameters.
	private _transportReady = false;

/**
	 * Creates a factory function.
	 */
	static createFactory(): HandlerFactory
	{
		return (): Chrome111 => new Chrome111();
	}

constructor()
	{
		super();
	}

get name(): string
	{
		return 'Chrome111';
	}