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Add optional sctpStreamId to SCTP-based data consumers #1378

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Add optional sctpStreamId to SCTP-based data consumers #1378

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d53af84
Add optional sctpStreamId to SCTP-based data consumers
threema-lenny Apr 18, 2024
6ac9747
Merge branch 'v3' into data-consumer-sctp-stream-id
ibc Apr 28, 2024
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6 changes: 6 additions & 0 deletions node/src/DataConsumer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,12 @@ export type DataConsumerOptions<DataConsumerAppData extends AppData = AppData> =
*/
maxRetransmits?: number;

/**
* Just if consuming over SCTP.
* SCTP stream id. If not provided defaults to an arbitrary available stream ID.
*/
sctpStreamId?: number;

/**
* Whether the data consumer must start in paused mode. Default false.
*/
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44 changes: 25 additions & 19 deletions node/src/Transport.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1091,6 +1091,7 @@ export class Transport<
ordered,
maxPacketLifeTime,
maxRetransmits,
sctpStreamId,
paused = false,
subchannels,
appData,
Expand All @@ -1113,7 +1114,6 @@ export class Transport<

let type: DataConsumerType;
let sctpStreamParameters: SctpStreamParameters | undefined;
let sctpStreamId: number;

// If this is not a DirectTransport, use sctpStreamParameters from the
// DataProducer (if type 'sctp') unless they are given in method parameters.
Expand All @@ -1139,10 +1139,9 @@ export class Transport<
}

// This may throw.
sctpStreamId = this.getNextSctpStreamId();

this.#sctpStreamIds![sctpStreamId] = 1;
sctpStreamParameters.streamId = sctpStreamId;
sctpStreamParameters.streamId = this.getNextSctpStreamId(sctpStreamId);
ortc.validateSctpStreamParameters(sctpStreamParameters);
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Why this call to ortc.validateSctpStreamParameters()?

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@threema-lenny threema-lenny Apr 25, 2024 •
edited
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It seemed like an oversight as this call is also present for validating the SCTP stream parameters for the producer (https://github.com/versatica/mediasoup/pull/1378/files#diff-3253c176609c972f1279e2a6c6ca4c52cbfac8423efcc8b2891b9d8dbd92c358R1016).

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Please remove it. There is no need for this. These sctpStreamParameters were already validated in transport.produceData() and they are literally a copy of them.

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@threema-lenny threema-lenny Apr 29, 2024 •
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You're right, only streamId is now user input but its value (besides type) is not validated in validateSctpStreamParameters anyways. I'll remove it.

this.#sctpStreamIds![sctpStreamParameters.streamId] = 1;
}
// If this is a DirectTransport, sctpStreamParameters must not be used.
else {
Expand All @@ -1151,10 +1150,11 @@ export class Transport<
if (
ordered !== undefined ||
maxPacketLifeTime !== undefined ||
maxRetransmits !== undefined
maxRetransmits !== undefined ||
sctpStreamId !== undefined
) {
logger.warn(
'consumeData() | ordered, maxPacketLifeTime and maxRetransmits are ignored when consuming data on a DirectTransport'
'consumeData() | ordered, maxPacketLifeTime, maxRetransmits and sctpStreamId are ignored when consuming data on a DirectTransport'
);
}
}
Expand Down Expand Up @@ -1213,14 +1213,14 @@ export class Transport<
this.dataConsumers.delete(dataConsumer.id);

if (this.#sctpStreamIds) {
this.#sctpStreamIds[sctpStreamId] = 0;
this.#sctpStreamIds[sctpStreamParameters!.streamId] = 0;
}
});
dataConsumer.on('@dataproducerclose', () => {
this.dataConsumers.delete(dataConsumer.id);

if (this.#sctpStreamIds) {
this.#sctpStreamIds[sctpStreamId] = 0;
this.#sctpStreamIds[sctpStreamParameters!.streamId] = 0;
}
});

Expand Down Expand Up @@ -1266,7 +1266,7 @@ export class Transport<
);
}

private getNextSctpStreamId(): number {
private getNextSctpStreamId(sctpStreamId?: number): number {
if (
!this.#data.sctpParameters ||
typeof this.#data.sctpParameters.MIS !== 'number'
Expand All @@ -1280,20 +1280,26 @@ export class Transport<
this.#sctpStreamIds = Buffer.alloc(numStreams, 0);
}

let sctpStreamId;

for (let idx = 0; idx < this.#sctpStreamIds.length; ++idx) {
sctpStreamId =
(this.#nextSctpStreamId + idx) % this.#sctpStreamIds.length;
if (sctpStreamId === undefined) {
for (let idx = 0; idx < this.#sctpStreamIds.length; ++idx) {
sctpStreamId =
(this.#nextSctpStreamId + idx) % this.#sctpStreamIds.length;

if (!this.#sctpStreamIds[sctpStreamId]) {
this.#nextSctpStreamId = sctpStreamId + 1;
if (!this.#sctpStreamIds[sctpStreamId]) {
this.#nextSctpStreamId = sctpStreamId + 1;

return sctpStreamId;
return sctpStreamId;
}
}

throw new Error('no sctpStreamId available');
} else if (sctpStreamId >= this.#sctpStreamIds.length) {
throw new Error('invalid sctpStreamId');
} else if (this.#sctpStreamIds[sctpStreamId]) {
throw new Error('sctpStreamId already assigned');
}

throw new Error('no sctpStreamId available');
return sctpStreamId;
}
}

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14 changes: 14 additions & 0 deletions node/src/test/test-DataConsumer.ts
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Expand Up @@ -107,6 +107,20 @@ test('transport.consumeData() succeeds', async () => {
});
}, 2000);

test('transport.consumeData() with already used sctpStreamId rejects with Error', async () => {
await ctx.webRtcTransport2!.consumeData({
dataProducerId: ctx.dataProducer!.id,
sctpStreamId: 123,
});
Comment on lines +111 to +114
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Please, create const dataConsumer here and assert that its sctpStreamParameters.streamId matches the given sctpStreamId.


await expect(
ctx.webRtcTransport2!.consumeData({
dataProducerId: ctx.dataProducer!.id,
sctpStreamId: 123,
})
).rejects.toThrow(Error);
}, 2000);

test('dataConsumer.dump() succeeds', async () => {
const dataConsumer = await ctx.webRtcTransport2!.consumeData({
dataProducerId: ctx.dataProducer!.id,
Expand Down
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