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import * as h264 from 'h264-profile-level-id';
import * as utils from './utils';
import { UnsupportedError } from './errors';
import { supportedRtpCapabilities } from './supportedRtpCapabilities';
import { parse as parseScalabilityMode } from './scalabilityModes';
import {
RtpCapabilities,
MediaKind,
RtpCodecCapability,
RtpHeaderExtension,
RtpParameters,
RtpCodecParameters,
RtcpFeedback,
RtpEncodingParameters,
RtpHeaderExtensionParameters,
RtcpParameters
} from './RtpParameters';
import {
SctpCapabilities,
NumSctpStreams,
SctpParameters,
SctpStreamParameters
} from './SctpParameters';
type RtpMapping =
{
codecs:
{
payloadType: number;
mappedPayloadType: number;
}[];
encodings:
{
ssrc?: number;
rid?: string;
scalabilityMode?: string;
mappedSsrc: number;
}[];
}
const DynamicPayloadTypes =
[
100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110,
111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
122, 123, 124, 125, 126, 127, 96, 97, 98, 99
];
/**
* Validates RtpCapabilities. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtpCapabilities(caps: RtpCapabilities): void
{
if (typeof caps !== 'object')
throw new TypeError('caps is not an object');
// codecs is optional. If unset, fill with an empty array.
if (caps.codecs && !Array.isArray(caps.codecs))
throw new TypeError('caps.codecs is not an array');
else if (!caps.codecs)
caps.codecs = [];
for (const codec of caps.codecs)
{
validateRtpCodecCapability(codec);
}
// headerExtensions is optional. If unset, fill with an empty array.
if (caps.headerExtensions && !Array.isArray(caps.headerExtensions))
throw new TypeError('caps.headerExtensions is not an array');
else if (!caps.headerExtensions)
caps.headerExtensions = [];
for (const ext of caps.headerExtensions)
{
validateRtpHeaderExtension(ext);
}
}
/**
* Validates RtpCodecCapability. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtpCodecCapability(codec: RtpCodecCapability): void
{
const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
if (typeof codec !== 'object')
throw new TypeError('codec is not an object');
// mimeType is mandatory.
if (!codec.mimeType || typeof codec.mimeType !== 'string')
throw new TypeError('missing codec.mimeType');
const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
if (!mimeTypeMatch)
throw new TypeError('invalid codec.mimeType');
// Just override kind with media component of mimeType.
codec.kind = mimeTypeMatch[1].toLowerCase() as MediaKind;
// preferredPayloadType is optional.
if (codec.preferredPayloadType && typeof codec.preferredPayloadType !== 'number')
throw new TypeError('invalid codec.preferredPayloadType');
// clockRate is mandatory.
if (typeof codec.clockRate !== 'number')
throw new TypeError('missing codec.clockRate');
// channels is optional. If unset, set it to 1 (just if audio).
if (codec.kind === 'audio')
{
if (typeof codec.channels !== 'number')
codec.channels = 1;
}
else
{
delete codec.channels;
}
// parameters is optional. If unset, set it to an empty object.
if (!codec.parameters || typeof codec.parameters !== 'object')
codec.parameters = {};
for (const key of Object.keys(codec.parameters))
{
let value = codec.parameters[key];
if (value === undefined)
{
codec.parameters[key] = '';
value = '';
}
if (typeof value !== 'string' && typeof value !== 'number')
{
throw new TypeError(
`invalid codec parameter [key:${key}s, value:${value}]`);
}
// Specific parameters validation.
if (key === 'apt')
{
if (typeof value !== 'number')
throw new TypeError('invalid codec apt parameter');
}
}
// rtcpFeedback is optional. If unset, set it to an empty array.
if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback))
codec.rtcpFeedback = [];
for (const fb of codec.rtcpFeedback)
{
validateRtcpFeedback(fb);
}
}
/**
* Validates RtcpFeedback. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtcpFeedback(fb: RtcpFeedback): void
{
if (typeof fb !== 'object')
throw new TypeError('fb is not an object');
// type is mandatory.
if (!fb.type || typeof fb.type !== 'string')
throw new TypeError('missing fb.type');
// parameter is optional. If unset set it to an empty string.
if (!fb.parameter || typeof fb.parameter !== 'string')
fb.parameter = '';
}
/**
* Validates RtpHeaderExtension. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtpHeaderExtension(ext: RtpHeaderExtension): void
{
if (typeof ext !== 'object')
throw new TypeError('ext is not an object');
// kind is optional. If unset set it to an empty string.
if (!ext.kind || typeof ext.kind !== 'string')
ext.kind = '';
if (ext.kind !== '' && ext.kind !== 'audio' && ext.kind !== 'video')
throw new TypeError('invalid ext.kind');
// uri is mandatory.
if (!ext.uri || typeof ext.uri !== 'string')
throw new TypeError('missing ext.uri');
// preferredId is mandatory.
if (typeof ext.preferredId !== 'number')
throw new TypeError('missing ext.preferredId');
// preferredEncrypt is optional. If unset set it to false.
if (ext.preferredEncrypt && typeof ext.preferredEncrypt !== 'boolean')
throw new TypeError('invalid ext.preferredEncrypt');
else if (!ext.preferredEncrypt)
ext.preferredEncrypt = false;
// direction is optional. If unset set it to sendrecv.
if (ext.direction && typeof ext.direction !== 'string')
throw new TypeError('invalid ext.direction');
else if (!ext.direction)
ext.direction = 'sendrecv';
}
/**
* Validates RtpParameters. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtpParameters(params: RtpParameters): void
{
if (typeof params !== 'object')
throw new TypeError('params is not an object');
// mid is optional.
if (params.mid && typeof params.mid !== 'string')
throw new TypeError('params.mid is not a string');
// codecs is mandatory.
if (!Array.isArray(params.codecs))
throw new TypeError('missing params.codecs');
for (const codec of params.codecs)
{
validateRtpCodecParameters(codec);
}
// headerExtensions is optional. If unset, fill with an empty array.
if (params.headerExtensions && !Array.isArray(params.headerExtensions))
throw new TypeError('params.headerExtensions is not an array');
else if (!params.headerExtensions)
params.headerExtensions = [];
for (const ext of params.headerExtensions)
{
validateRtpHeaderExtensionParameters(ext);
}
// encodings is optional. If unset, fill with an empty array.
if (params.encodings && !Array.isArray(params.encodings))
throw new TypeError('params.encodings is not an array');
else if (!params.encodings)
params.encodings = [];
for (const encoding of params.encodings)
{
validateRtpEncodingParameters(encoding);
}
// rtcp is optional. If unset, fill with an empty object.
if (params.rtcp && typeof params.rtcp !== 'object')
throw new TypeError('params.rtcp is not an object');
else if (!params.rtcp)
params.rtcp = {};
validateRtcpParameters(params.rtcp);
}
/**
* Validates RtpCodecParameters. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtpCodecParameters(codec: RtpCodecParameters): void
{
const MimeTypeRegex = new RegExp('^(audio|video)/(.+)', 'i');
if (typeof codec !== 'object')
throw new TypeError('codec is not an object');
// mimeType is mandatory.
if (!codec.mimeType || typeof codec.mimeType !== 'string')
throw new TypeError('missing codec.mimeType');
const mimeTypeMatch = MimeTypeRegex.exec(codec.mimeType);
if (!mimeTypeMatch)
throw new TypeError('invalid codec.mimeType');
// payloadType is mandatory.
if (typeof codec.payloadType !== 'number')
throw new TypeError('missing codec.payloadType');
// clockRate is mandatory.
if (typeof codec.clockRate !== 'number')
throw new TypeError('missing codec.clockRate');
const kind = mimeTypeMatch[1].toLowerCase() as MediaKind;
// channels is optional. If unset, set it to 1 (just if audio).
if (kind === 'audio')
{
if (typeof codec.channels !== 'number')
codec.channels = 1;
}
else
{
delete codec.channels;
}
// parameters is optional. If unset, set it to an empty object.
if (!codec.parameters || typeof codec.parameters !== 'object')
codec.parameters = {};
for (const key of Object.keys(codec.parameters))
{
let value = codec.parameters[key];
if (value === undefined)
{
codec.parameters[key] = '';
value = '';
}
if (typeof value !== 'string' && typeof value !== 'number')
{
throw new TypeError(
`invalid codec parameter [key:${key}s, value:${value}]`);
}
// Specific parameters validation.
if (key === 'apt')
{
if (typeof value !== 'number')
throw new TypeError('invalid codec apt parameter');
}
}
// rtcpFeedback is optional. If unset, set it to an empty array.
if (!codec.rtcpFeedback || !Array.isArray(codec.rtcpFeedback))
codec.rtcpFeedback = [];
for (const fb of codec.rtcpFeedback)
{
validateRtcpFeedback(fb);
}
}
/**
* Validates RtpHeaderExtensionParameteters. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtpHeaderExtensionParameters(
ext: RtpHeaderExtensionParameters
): void
{
if (typeof ext !== 'object')
throw new TypeError('ext is not an object');
// uri is mandatory.
if (!ext.uri || typeof ext.uri !== 'string')
throw new TypeError('missing ext.uri');
// id is mandatory.
if (typeof ext.id !== 'number')
throw new TypeError('missing ext.id');
// encrypt is optional. If unset set it to false.
if (ext.encrypt && typeof ext.encrypt !== 'boolean')
throw new TypeError('invalid ext.encrypt');
else if (!ext.encrypt)
ext.encrypt = false;
// parameters is optional. If unset, set it to an empty object.
if (!ext.parameters || typeof ext.parameters !== 'object')
ext.parameters = {};
for (const key of Object.keys(ext.parameters))
{
let value = ext.parameters[key];
if (value === undefined)
{
ext.parameters[key] = '';
value = '';
}
if (typeof value !== 'string' && typeof value !== 'number')
throw new TypeError('invalid header extension parameter');
}
}
/**
* Validates RtpEncodingParameters. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtpEncodingParameters(encoding: RtpEncodingParameters): void
{
if (typeof encoding !== 'object')
throw new TypeError('encoding is not an object');
// ssrc is optional.
if (encoding.ssrc && typeof encoding.ssrc !== 'number')
throw new TypeError('invalid encoding.ssrc');
// rid is optional.
if (encoding.rid && typeof encoding.rid !== 'string')
throw new TypeError('invalid encoding.rid');
// rtx is optional.
if (encoding.rtx && typeof encoding.rtx !== 'object')
{
throw new TypeError('invalid encoding.rtx');
}
else if (encoding.rtx)
{
// RTX ssrc is mandatory if rtx is present.
if (typeof encoding.rtx.ssrc !== 'number')
throw new TypeError('missing encoding.rtx.ssrc');
}
// dtx is optional. If unset set it to false.
if (!encoding.dtx || typeof encoding.dtx !== 'boolean')
encoding.dtx = false;
// scalabilityMode is optional.
if (encoding.scalabilityMode && typeof encoding.scalabilityMode !== 'string')
throw new TypeError('invalid encoding.scalabilityMode');
}
/**
* Validates RtcpParameters. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateRtcpParameters(rtcp: RtcpParameters): void
{
if (typeof rtcp !== 'object')
throw new TypeError('rtcp is not an object');
// cname is optional.
if (rtcp.cname && typeof rtcp.cname !== 'string')
throw new TypeError('invalid rtcp.cname');
// reducedSize is optional. If unset set it to true.
if (!rtcp.reducedSize || typeof rtcp.reducedSize !== 'boolean')
rtcp.reducedSize = true;
}
/**
* Validates SctpCapabilities. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateSctpCapabilities(caps: SctpCapabilities): void
{
if (typeof caps !== 'object')
throw new TypeError('caps is not an object');
// numStreams is mandatory.
if (!caps.numStreams || typeof caps.numStreams !== 'object')
throw new TypeError('missing caps.numStreams');
validateNumSctpStreams(caps.numStreams);
}
/**
* Validates NumSctpStreams. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateNumSctpStreams(numStreams: NumSctpStreams): void
{
if (typeof numStreams !== 'object')
throw new TypeError('numStreams is not an object');
// OS is mandatory.
if (typeof numStreams.OS !== 'number')
throw new TypeError('missing numStreams.OS');
// MIS is mandatory.
if (typeof numStreams.MIS !== 'number')
throw new TypeError('missing numStreams.MIS');
}
/**
* Validates SctpParameters. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateSctpParameters(params: SctpParameters): void
{
if (typeof params !== 'object')
throw new TypeError('params is not an object');
// port is mandatory.
if (typeof params.port !== 'number')
throw new TypeError('missing params.port');
// OS is mandatory.
if (typeof params.OS !== 'number')
throw new TypeError('missing params.OS');
// MIS is mandatory.
if (typeof params.MIS !== 'number')
throw new TypeError('missing params.MIS');
// maxMessageSize is mandatory.
if (typeof params.maxMessageSize !== 'number')
throw new TypeError('missing params.maxMessageSize');
}
/**
* Validates SctpStreamParameters. It may modify given data by adding missing
* fields with default values.
* It throws if invalid.
*/
export function validateSctpStreamParameters(params: SctpStreamParameters): void
{
if (typeof params !== 'object')
throw new TypeError('params is not an object');
// streamId is mandatory.
if (typeof params.streamId !== 'number')
throw new TypeError('missing params.streamId');
// ordered is optional.
let orderedGiven = false;
if (typeof params.ordered === 'boolean')
orderedGiven = true;
else
params.ordered = true;
// maxPacketLifeTime is optional.
if (params.maxPacketLifeTime && typeof params.maxPacketLifeTime !== 'number')
throw new TypeError('invalid params.maxPacketLifeTime');
// maxRetransmits is optional.
if (params.maxRetransmits && typeof params.maxRetransmits !== 'number')
throw new TypeError('invalid params.maxRetransmits');
if (params.maxPacketLifeTime && params.maxRetransmits)
throw new TypeError('cannot provide both maxPacketLifeTime and maxRetransmits');
if (
orderedGiven &&
params.ordered &&
(params.maxPacketLifeTime || params.maxRetransmits)
)
{
throw new TypeError('cannot be ordered with maxPacketLifeTime or maxRetransmits');
}
else if (!orderedGiven && (params.maxPacketLifeTime || params.maxRetransmits))
{
params.ordered = false;
}
}
/**
* Generate RTP capabilities for the Router based on the given media codecs and
* mediasoup supported RTP capabilities.
*/
export function generateRouterRtpCapabilities(
mediaCodecs: RtpCodecCapability[] = []
): RtpCapabilities
{
// Normalize supported RTP capabilities.
validateRtpCapabilities(supportedRtpCapabilities);
if (!Array.isArray(mediaCodecs))
throw new TypeError('mediaCodecs must be an Array');
const clonedSupportedRtpCapabilities =
utils.clone(supportedRtpCapabilities) as RtpCapabilities;
const dynamicPayloadTypes = utils.clone(DynamicPayloadTypes) as number[];
const caps: RtpCapabilities =
{
codecs : [],
headerExtensions : clonedSupportedRtpCapabilities.headerExtensions
};
for (const mediaCodec of mediaCodecs)
{
// This may throw.
validateRtpCodecCapability(mediaCodec);
const matchedSupportedCodec = clonedSupportedRtpCapabilities
.codecs!
.find((supportedCodec) => (
matchCodecs(mediaCodec, supportedCodec, { strict: false }))
);
if (!matchedSupportedCodec)
{
throw new UnsupportedError(
`media codec not supported [mimeType:${mediaCodec.mimeType}]`);
}
// Clone the supported codec.
const codec = utils.clone(matchedSupportedCodec) as RtpCodecCapability;
// If the given media codec has preferredPayloadType, keep it.
if (typeof mediaCodec.preferredPayloadType === 'number')
{
codec.preferredPayloadType = mediaCodec.preferredPayloadType;
// Also remove the pt from the list of available dynamic values.
const idx = dynamicPayloadTypes.indexOf(codec.preferredPayloadType);
if (idx > -1)
dynamicPayloadTypes.splice(idx, 1);
}
// Otherwise if the supported codec has preferredPayloadType, use it.
else if (typeof codec.preferredPayloadType === 'number')
{
// No need to remove it from the list since it's not a dynamic value.
}
// Otherwise choose a dynamic one.
else
{
// Take the first available pt and remove it from the list.
const pt = dynamicPayloadTypes.shift();
if (!pt)
throw new Error('cannot allocate more dynamic codec payload types');
codec.preferredPayloadType = pt;
}
// Ensure there is not duplicated preferredPayloadType values.
if (caps.codecs!.some((c) => c.preferredPayloadType === codec.preferredPayloadType))
throw new TypeError('duplicated codec.preferredPayloadType');
// Merge the media codec parameters.
codec.parameters = { ...codec.parameters, ...mediaCodec.parameters };
// Append to the codec list.
caps.codecs!.push(codec);
// Add a RTX video codec if video.
if (codec.kind === 'video')
{
// Take the first available pt and remove it from the list.
const pt = dynamicPayloadTypes.shift();
if (!pt)
throw new Error('cannot allocate more dynamic codec payload types');
const rtxCodec: RtpCodecCapability =
{
kind : codec.kind,
mimeType : `${codec.kind}/rtx`,
preferredPayloadType : pt,
clockRate : codec.clockRate,
parameters :
{
apt : codec.preferredPayloadType
},
rtcpFeedback : []
};
// Append to the codec list.
caps.codecs!.push(rtxCodec);
}
}
return caps;
}
/**
* Get a mapping of codec payloads and encodings of the given Producer RTP
* parameters as values expected by the Router.
*
* It may throw if invalid or non supported RTP parameters are given.
*/
export function getProducerRtpParametersMapping(
params: RtpParameters,
caps: RtpCapabilities
): RtpMapping
{
const rtpMapping: RtpMapping =
{
codecs : [],
encodings : []
};
// Match parameters media codecs to capabilities media codecs.
const codecToCapCodec: Map<RtpCodecParameters, RtpCodecCapability> = new Map();
for (const codec of params.codecs)
{
if (isRtxCodec(codec))
continue;
// Search for the same media codec in capabilities.
const matchedCapCodec = caps.codecs!
.find((capCodec) => (
matchCodecs(codec, capCodec, { strict: true, modify: true }))
);
if (!matchedCapCodec)
{
throw new UnsupportedError(
`unsupported codec [mimeType:${codec.mimeType}, payloadType:${codec.payloadType}]`);
}
codecToCapCodec.set(codec, matchedCapCodec);
}
// Match parameters RTX codecs to capabilities RTX codecs.
for (const codec of params.codecs)
{
if (!isRtxCodec(codec))
continue;
// Search for the associated media codec.
const associatedMediaCodec = params.codecs
.find((mediaCodec) => mediaCodec.payloadType === codec.parameters.apt);
if (!associatedMediaCodec)
{
throw new TypeError(
`missing media codec found for RTX PT ${codec.payloadType}`);
}
const capMediaCodec = codecToCapCodec.get(associatedMediaCodec);
// Ensure that the capabilities media codec has a RTX codec.
const associatedCapRtxCodec = caps.codecs!
.find((capCodec) => (
isRtxCodec(capCodec) &&
capCodec.parameters.apt === capMediaCodec!.preferredPayloadType
));
if (!associatedCapRtxCodec)
{
throw new UnsupportedError(
`no RTX codec for capability codec PT ${capMediaCodec!.preferredPayloadType}`);
}
codecToCapCodec.set(codec, associatedCapRtxCodec);
}
// Generate codecs mapping.
for (const [ codec, capCodec ] of codecToCapCodec)
{
rtpMapping.codecs.push(
{
payloadType : codec.payloadType,
mappedPayloadType : capCodec.preferredPayloadType!
});
}
// Generate encodings mapping.
let mappedSsrc = utils.generateRandomNumber();
for (const encoding of params.encodings!)
{
const mappedEncoding: any = {};
mappedEncoding.mappedSsrc = mappedSsrc++;
if (encoding.rid)
mappedEncoding.rid = encoding.rid;
if (encoding.ssrc)
mappedEncoding.ssrc = encoding.ssrc;
if (encoding.scalabilityMode)
mappedEncoding.scalabilityMode = encoding.scalabilityMode;
rtpMapping.encodings.push(mappedEncoding);
}
return rtpMapping;
}
/**
* Generate RTP parameters to be internally used by Consumers given the RTP
* parameters of a Producer and the RTP capabilities of the Router.
*/
export function getConsumableRtpParameters(
kind: string,
params: RtpParameters,
caps: RtpCapabilities,
rtpMapping: RtpMapping
): RtpParameters
{
const consumableParams: RtpParameters =
{
codecs : [],
headerExtensions : [],
encodings : [],
rtcp : {}
};
for (const codec of params.codecs)
{
if (isRtxCodec(codec))
continue;
const consumableCodecPt = rtpMapping.codecs
.find((entry) => entry.payloadType === codec.payloadType)!
.mappedPayloadType;
const matchedCapCodec = caps.codecs!
.find((capCodec) => capCodec.preferredPayloadType === consumableCodecPt)!;
const consumableCodec: RtpCodecParameters =
{
mimeType : matchedCapCodec.mimeType,
payloadType : matchedCapCodec.preferredPayloadType!,
clockRate : matchedCapCodec.clockRate,
channels : matchedCapCodec.channels,
parameters : codec.parameters, // Keep the Producer codec parameters.
rtcpFeedback : matchedCapCodec.rtcpFeedback
};
consumableParams.codecs.push(consumableCodec);
const consumableCapRtxCodec = caps.codecs!
.find((capRtxCodec) => (
isRtxCodec(capRtxCodec) &&
capRtxCodec.parameters.apt === consumableCodec.payloadType
));
if (consumableCapRtxCodec)
{
const consumableRtxCodec: RtpCodecParameters =
{
mimeType : consumableCapRtxCodec.mimeType,
payloadType : consumableCapRtxCodec.preferredPayloadType!,
clockRate : consumableCapRtxCodec.clockRate,
parameters : consumableCapRtxCodec.parameters,
rtcpFeedback : consumableCapRtxCodec.rtcpFeedback
};
consumableParams.codecs.push(consumableRtxCodec);
}
}
for (const capExt of caps.headerExtensions!)
{
// Just take RTP header extension that can be used in Consumers.
if (
capExt.kind !== kind ||
(capExt.direction !== 'sendrecv' && capExt.direction !== 'sendonly')
)
{
continue;
}
const consumableExt =
{
uri : capExt.uri,
id : capExt.preferredId,
encrypt : capExt.preferredEncrypt,
parameters : {}
};
consumableParams.headerExtensions!.push(consumableExt);
}
// Clone Producer encodings since we'll mangle them.
const consumableEncodings = utils.clone(params.encodings) as RtpEncodingParameters[];
for (let i = 0; i < consumableEncodings.length; ++i)
{
const consumableEncoding = consumableEncodings[i];
const { mappedSsrc } = rtpMapping.encodings[i];
// Remove useless fields.
delete consumableEncoding.rid;
delete consumableEncoding.rtx;
delete consumableEncoding.codecPayloadType;
// Set the mapped ssrc.
consumableEncoding.ssrc = mappedSsrc;
consumableParams.encodings!.push(consumableEncoding);
}
consumableParams.rtcp =
{
cname : params.rtcp!.cname,
reducedSize : true,
mux : true
};
return consumableParams;
}
/**
* Check whether the given RTP capabilities can consume the given Producer.
*/
export function canConsume(
consumableParams: RtpParameters,
caps: RtpCapabilities
): boolean
{
// This may throw.
validateRtpCapabilities(caps);
const matchingCodecs: RtpCodecParameters[] = [];
for (const codec of consumableParams.codecs)
{
const matchedCapCodec = caps.codecs!
.find((capCodec) => matchCodecs(capCodec, codec, { strict: true }));
if (!matchedCapCodec)
continue;
matchingCodecs.push(codec);
}
// Ensure there is at least one media codec.
if (matchingCodecs.length === 0 || isRtxCodec(matchingCodecs[0]))
return false;
return true;
}
/**
* Generate RTP parameters for a specific Consumer.
*
* It reduces encodings to just one and takes into account given RTP capabilities
* to reduce codecs, codecs' RTCP feedback and header extensions, and also enables
* or disabled RTX.
*/
export function getConsumerRtpParameters(
consumableParams: RtpParameters,
caps: RtpCapabilities,
pipe: boolean
): RtpParameters
{
const consumerParams: RtpParameters =
{
codecs : [],
headerExtensions : [],
encodings : [],
rtcp : consumableParams.rtcp
};
for (const capCodec of caps.codecs!)
{
validateRtpCodecCapability(capCodec);
}
const consumableCodecs =
utils.clone(consumableParams.codecs) as RtpCodecParameters[];
let rtxSupported = false;
for (const codec of consumableCodecs)
{
const matchedCapCodec = caps.codecs!
.find((capCodec) => matchCodecs(capCodec, codec, { strict: true }));
if (!matchedCapCodec)
continue;
codec.rtcpFeedback = matchedCapCodec.rtcpFeedback;
consumerParams.codecs.push(codec);
}
// Must sanitize the list of matched codecs by removing useless RTX codecs.
for (let idx = consumerParams.codecs.length -1; idx >= 0; --idx)
{
const codec = consumerParams.codecs[idx];
if (isRtxCodec(codec))
{
// Search for the associated media codec.
const associatedMediaCodec = consumerParams.codecs
.find((mediaCodec) => mediaCodec.payloadType === codec.parameters.apt);
if (associatedMediaCodec)
rtxSupported = true;
else
consumerParams.codecs.splice(idx, 1);
}
}
// Ensure there is at least one media codec.
if (consumerParams.codecs.length === 0 || isRtxCodec(consumerParams.codecs[0]))
{
throw new UnsupportedError('no compatible media codecs');
}
consumerParams.headerExtensions = consumableParams.headerExtensions!
.filter((ext) => (
caps.headerExtensions!
.some((capExt) => (
capExt.preferredId === ext.id &&
capExt.uri === ext.uri
))
));
// Reduce codecs' RTCP feedback. Use Transport-CC if available, REMB otherwise.
if (
consumerParams.headerExtensions.some((ext) => (
ext.uri === 'http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01'
))
)
{
for (const codec of consumerParams.codecs)
{
codec.rtcpFeedback = codec.rtcpFeedback!
.filter((fb) => fb.type !== 'goog-remb');
}
}
else if (
consumerParams.headerExtensions.some((ext) => (
ext.uri === 'http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time'
))
)
{
for (const codec of consumerParams.codecs)
{
codec.rtcpFeedback = codec.rtcpFeedback!
.filter((fb) => fb.type !== 'transport-cc');
}
}
else
{
for (const codec of consumerParams.codecs)
{
codec.rtcpFeedback = codec.rtcpFeedback!
.filter((fb) => (
fb.type !== 'transport-cc' &&
fb.type !== 'goog-remb'
));
}
}
if (!pipe)
{
const consumerEncoding: RtpEncodingParameters =
{
ssrc : utils.generateRandomNumber()
};
if (rtxSupported)
consumerEncoding.rtx = { ssrc: consumerEncoding.ssrc! + 1 };
// If any of the consumableParams.encodings has scalabilityMode, process it
// (assume all encodings have the same value).
const encodingWithScalabilityMode =
consumableParams.encodings!.find((encoding) => encoding.scalabilityMode);
let scalabilityMode = encodingWithScalabilityMode
? encodingWithScalabilityMode.scalabilityMode
: undefined;
// If there is simulast, mangle spatial layers in scalabilityMode.
if (consumableParams.encodings!.length > 1)
{
const { temporalLayers } = parseScalabilityMode(scalabilityMode);
scalabilityMode = `S${consumableParams.encodings!.length}T${temporalLayers}`;
}
if (scalabilityMode)
consumerEncoding.scalabilityMode = scalabilityMode;
// Use the maximum maxBitrate in any encoding and honor it in the Consumer's
// encoding.
const maxEncodingMaxBitrate =
consumableParams.encodings!.reduce((maxBitrate, encoding) => (
encoding.maxBitrate && encoding.maxBitrate > maxBitrate
? encoding.maxBitrate
: maxBitrate
), 0);
if (maxEncodingMaxBitrate)
{
consumerEncoding.maxBitrate = maxEncodingMaxBitrate;
}
// Set a single encoding for the Consumer.
consumerParams.encodings!.push(consumerEncoding);
}
else
{
const consumableEncodings =
utils.clone(consumableParams.encodings) as RtpEncodingParameters[];
const baseSsrc = utils.generateRandomNumber();
const baseRtxSsrc = utils.generateRandomNumber();
for (let i = 0; i < consumableEncodings.length; ++i)
{
const encoding = consumableEncodings[i];
encoding.ssrc = baseSsrc + i;
if (rtxSupported)
encoding.rtx = { ssrc: baseRtxSsrc + i };
else
delete encoding.rtx;
consumerParams.encodings!.push(encoding);
}
}
return consumerParams;
}
/**
* Generate RTP parameters for a pipe Consumer.
*
* It keeps all original consumable encodings and removes support for BWE. If
* enableRtx is false, it also removes RTX and NACK support.
*/
export function getPipeConsumerRtpParameters(
consumableParams: RtpParameters,
enableRtx = false
): RtpParameters
{
const consumerParams: RtpParameters =
{
codecs : [],
headerExtensions : [],
encodings : [],
rtcp : consumableParams.rtcp
};
const consumableCodecs =
utils.clone(consumableParams.codecs) as RtpCodecParameters[];
for (const codec of consumableCodecs)
{
if (!enableRtx && isRtxCodec(codec))
continue;
codec.rtcpFeedback = codec.rtcpFeedback!
.filter((fb) => (
(fb.type === 'nack' && fb.parameter === 'pli') ||
(fb.type === 'ccm' && fb.parameter === 'fir') ||
(enableRtx && fb.type === 'nack' && !fb.parameter)
));
consumerParams.codecs.push(codec);
}
// Reduce RTP extensions by disabling transport MID and BWE related ones.
consumerParams.headerExtensions = consumableParams.headerExtensions!
.filter((ext) => (
ext.uri !== 'urn:ietf:params:rtp-hdrext:sdes:mid' &&
ext.uri !== 'http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time' &&
ext.uri !== 'http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01'
));
const consumableEncodings =
utils.clone(consumableParams.encodings) as RtpEncodingParameters[];
const baseSsrc = utils.generateRandomNumber();
const baseRtxSsrc = utils.generateRandomNumber();
for (let i = 0; i < consumableEncodings.length; ++i)
{
const encoding = consumableEncodings[i];
encoding.ssrc = baseSsrc + i;
if (enableRtx)
encoding.rtx = { ssrc: baseRtxSsrc + i };
else
delete encoding.rtx;
consumerParams.encodings!.push(encoding);
}
return consumerParams;
}
function isRtxCodec(codec: RtpCodecCapability | RtpCodecParameters): boolean
{
return /.+\/rtx$/i.test(codec.mimeType);
}
function matchCodecs(
aCodec: RtpCodecCapability | RtpCodecParameters,
bCodec: RtpCodecCapability | RtpCodecParameters,
{ strict = false, modify = false } = {}
): boolean
{
const aMimeType = aCodec.mimeType.toLowerCase();
const bMimeType = bCodec.mimeType.toLowerCase();
if (aMimeType !== bMimeType)
return false;
if (aCodec.clockRate !== bCodec.clockRate)
return false;
if (aCodec.channels !== bCodec.channels)
return false;
// Per codec special checks.
switch (aMimeType)
{
case 'video/h264':
{
const aPacketizationMode = aCodec.parameters['packetization-mode'] || 0;
const bPacketizationMode = bCodec.parameters['packetization-mode'] || 0;
if (aPacketizationMode !== bPacketizationMode)
return false;
// If strict matching check profile-level-id.
if (strict)
{
if (!h264.isSameProfile(aCodec.parameters, bCodec.parameters))
return false;
let selectedProfileLevelId;
try
{
selectedProfileLevelId =
h264.generateProfileLevelIdForAnswer(aCodec.parameters, bCodec.parameters);
}
catch (error)
{
return false;
}
if (modify)
{
if (selectedProfileLevelId)
aCodec.parameters['profile-level-id'] = selectedProfileLevelId;
else
delete aCodec.parameters['profile-level-id'];
}
}
break;
}
case 'video/vp9':
{
// If strict matching check profile-id.
if (strict)
{
const aProfileId = aCodec.parameters['profile-id'] || 0;
const bProfileId = bCodec.parameters['profile-id'] || 0;
if (aProfileId !== bProfileId)
return false;
}
break;
}
}
return true;
}
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