mediasoup-sdp-bridge v3

Node.js library to allow integration of SDP based clients with mediasoup.

Website and Documentation

• mediasoup.org

Support Forum

• mediasoup.discourse.group

Usage Example

Within the Node.js server app running mediasoup:

Remote SDP endpoint sends media to mediasoup

import { createSdpEndpoint } from 'mediasoup-sdp-bridge';
import { types as mediasoupTypes } from 'mediasoup';
import mySignaling from './my-signaling'; // Our own signaling stuff.

// Create a SdpEndpoint to receive media from the remote endpoint.
const sdpEndpoint = await createSdpEndpoint({
  // A mediasoup WebRtcTransport or PlainTransport.
  transport: transport
});

// Upon receipt of a SDP offer from the remote endpoint, apply it.
mySignaling.on('sdp-offer', async (sdpOffer: string) => {
  // This method will resolve with an array of created mediasoup Producers.
  const producers = await sdpEndpoint.processOffer(sdpOffer);

  // Obtain the corresponding SDP answer and reply the remote endpoint with it.
  const sdpAnswer = sdpEndpoint.createAnswer();
  // or:
  const sdpAnswerObject = sdpEndpoint.createAnswerObject();

  mySignaling.sendAnswer(sdpAnswer);
});

mediasoup sends media to the remote SDP endpoint

import {
  createSdpEndpoint, 
  generateRtpCapabilities
} from 'mediasoup-sdp-bridge';
import { types as mediasoupTypes } from 'mediasoup';
import mySignaling from './my-signaling'; // Our own signaling stuff.

// Create a SdpEndpoint to send media to the remote endpoint.
const sdpEndpoint = await createSdpEndpoint({
  // A mediasoup WebRtcTransport or PlainTransport.
  transport: transport,
});

// Generate remote endpoint's RTP capabilities based on a remote SDP or based
// on handmade capabilities.
const endpointRtpCapabilities =
  generateRtpCapabilities(router.rtpCapabilities, remoteSdp);
// or:
const endpointRtpCapabilities =
  generateRtpCapabilities(router.rtpCapabilities, handmadeRtpCapabilities);

// Listen for 'negotiationneeded' event to send SDPs offers to the remote
// endpoint. This event is emitted when transport.consume() is called or
// when a Producer being consumed is closed or paused/resumed.
sdpEndpoint.on('negotiationneeded', () => {
  const sdpOffer = sdpEndpoint.createOffer();
  // or:
  const sdpOfferObject = sdpEndpoint.createOfferObject();

  // Send the SDP (re-)offer to the remote endpoint and wait for its SDP
  // answer.
  const answerSdp = await mySignaling.sendOffer(sdpOffer);

  // Provide the SdpEndpoint with the SDP answer.
  await sdpEndpoint.processAnswer(answerSdp);
});

// If there were mediasoup Producers already created in the Router, or if a new
// one is created, and we want to consume them in the remote endpoint, tell the
// Transport to consume them. transport.consume() method will trigger
// 'negotiationneeded' event above.
//
// NOTE: By calling consume() method in parallel (without waiting for the
// previous one to complete) we ensure that the 'negotiationneeded' event will
// just be emitted once upon completion of all consume() calls, so a single
// SDP O/A will be needed.
transport
  .consume({
    producerId: producer1.id,
    rtpCapabilities: endpointRtpCapabilities 
  })
  .catch((error) => console.error('transport.consume() failed:', error));

transport
  .consume({
    producerId: producer2.id,
    rtpCapabilities: endpointRtpCapabilities 
  })
  .catch((error) => console.error('transport.consume() failed:', error));

Author

• Iñaki Baz Castillo [website|github]

License

ISC