Add support for m.livekit

package.json

@@ -107,7 +107,7 @@
     "livekit-client": "^2.18.1",
     "lodash-es": "^4.17.21",
     "loglevel": "^1.9.1",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#3f05dc4d104a3dfc753c5e3549a18c74fab4b076",
+    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#b3f17e3ee8ca53f5625f7d8c482155d5a82ef4a2",
     "matrix-widget-api": "^1.18.0",
     "node-stdlib-browser": "^1.3.1",
     "normalize.css": "^8.0.1",

pnpm-lock.yaml

@@ -66,7 +66,7 @@ importers:
         version: 10.1.2(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
       '@rolldown/plugin-babel':
         specifier: ^0.2.3
-        version: 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))
+        version: 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.8)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))
       '@sentry/react':
         specifier: ^8.0.0
         version: 8.55.2(react@19.2.8)
@@ -138,7 +138,7 @@ importers:
         version: 10.4.0(@fontsource/inconsolata@5.3.0)(@fontsource/inter@5.3.0)(@types/react-dom@19.2.5(@types/react@19.2.18))(@types/react@19.2.18)(@vector-im/compound-design-tokens@11.3.1(@types/react@19.2.18)(react@19.2.8))(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
       '@vitejs/plugin-react':
         specifier: ^6.0.2
-        version: 6.1.1(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))
+        version: 6.1.1(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.8)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))
       '@vitest/browser-playwright':
         specifier: ^4.1.5
         version: 4.1.11(playwright@1.62.1)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))(vitest@4.1.11)
@@ -191,8 +191,8 @@ importers:
         specifier: ^1.9.1
         version: 1.9.2
       matrix-js-sdk:
-        specifier: github:matrix-org/matrix-js-sdk#3f05dc4d104a3dfc753c5e3549a18c74fab4b076
-        version: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/3f05dc4d104a3dfc753c5e3549a18c74fab4b076
+        specifier: github:matrix-org/matrix-js-sdk#b3f17e3ee8ca53f5625f7d8c482155d5a82ef4a2
+        version: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/b3f17e3ee8ca53f5625f7d8c482155d5a82ef4a2
       matrix-widget-api:
         specifier: ^1.18.0
         version: 1.20.0
@@ -397,8 +397,8 @@ packages:
     resolution: {integrity: sha512-Nq8OhGWiZIZGV6hLHoyAKLLcJihP/xFeBMGJoUrxTX2psI8dCifzLhZISFb+VWS3wFMRDmCGw5R+dOySCqPLhw==}
     engines: {node: '>=6.9.0'}
 
-  '@babel/runtime@8.0.0':
-    resolution: {integrity: sha512-sL6cvO2IfkSu/iU+zs2S/w01B7A8V7suXSIKEN4hPFFdZoiPGxrj5pAG0lCaqLWiEIrjKzdznIWuaLcxPR53qw==}
+  '@babel/runtime@8.0.8':
+    resolution: {integrity: sha512-dEu8nGlRqjsJsvviUUoSMfcRHpwomCiRlXsc2mPfJ79+ffTpDm+JtfUtTMzUrqCApHQnCsVPD3gT1ZT8RgBRCQ==}
 
   '@babel/template@7.29.7':
     resolution: {integrity: sha512-puq+Gf35oI24FeN11LkoUQFqv9uwNeWpxXZi/Ji3rRIoKAzKnxRaZ+Gkj0vKS9ZCiTESfng1N9LyOyXvo+m+Gg==}
@@ -408,10 +408,6 @@ packages:
     resolution: {integrity: sha512-B3lYAs2nkKskbgQ1nfy8Ma9ao9Q1rntTAQHrzzyDuj+TSO+X3le6PfWwqDvodsb+OumE10eMFfuMCTQSQ5iuIQ==}
     engines: {node: '>=6.9.0'}
 
-  '@babel/traverse@7.29.8':
-    resolution: {integrity: sha512-I5z7H3bf/41ktsNVLtpN0wAa336HkqIHQ5BuPLEhTkt1jVSyZpeNKIzTgEWmlxjdg81R0IgUCcaE+Ok3NvrfZg==}
-    engines: {node: '>=6.9.0'}
-
   '@babel/types@7.29.11':
     resolution: {integrity: sha512-WCsemW40Cpc6gouC1SrY6PBaZ+oLRlEVY9XBvZBI7il/HyUrb2nJ505wE1MHEFyDZNnrWDEuy4jL50WVHfTTSQ==}
     engines: {node: '>=6.9.0'}
@@ -3421,11 +3417,6 @@ packages:
     engines: {node: '>=0.4.0'}
     hasBin: true
 
-  acorn@8.18.0:
-    resolution: {integrity: sha512-lGq+9yr1/GuAWaVYIHRjvvySG5/4VfKIvC8EWxStPdcDh/Ka7FG3twP6v4d5BkravUilhIAsG4Qj83t02LWUPQ==}
-    engines: {node: '>=0.4.0'}
-    hasBin: true
-
   acorn@8.19.0:
     resolution: {integrity: sha512-oJlA3XiRm7Cyk6qFD2Jn8ak9B7jSy0qy00ADO3+8dpT0LSjFihQYv4C02LFCSYJV3Q37xYwwRy5m+IpIiUzqWw==}
     engines: {node: '>=0.4.0'}
@@ -4759,9 +4750,9 @@ packages:
   matrix-events-sdk@0.0.1:
     resolution: {integrity: sha512-1QEOsXO+bhyCroIe2/A5OwaxHvBm7EsSQ46DEDn8RBIfQwN5HWBpFvyWWR4QY0KHPPnnJdI99wgRiAl7Ad5qaA==}
 
-  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/3f05dc4d104a3dfc753c5e3549a18c74fab4b076:
-    resolution: {gitHosted: true, integrity: sha512-Ly8eS7fNNKDo9KmPvTkE49KvD8iMUmrVWJMNERNuxc8UksMLMG36NLz3fs8HytdwrB7AKPfyVo392VZsxILDIg==, tarball: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/3f05dc4d104a3dfc753c5e3549a18c74fab4b076}
-    version: 44.0.0
+  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/b3f17e3ee8ca53f5625f7d8c482155d5a82ef4a2:
+    resolution: {gitHosted: true, integrity: sha512-AXD5ClohyPLBY30QfmkD99fAGlAMsQ+2flR8rWqTy8aNpLHnTUisNhAClDgkAaDTnnFbOX/vZ8hwVzmYSefqTA==, tarball: https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/b3f17e3ee8ca53f5625f7d8c482155d5a82ef4a2}
+    version: 45.0.0
     engines: {node: '>=22.0.0'}
 
   matrix-widget-api@1.20.0:
@@ -6357,10 +6348,10 @@ snapshots:
       '@babel/helper-compilation-targets': 7.29.7
       '@babel/helper-module-transforms': 7.29.7(@babel/core@7.29.7(supports-color@7.2.0))(supports-color@7.2.0)
       '@babel/helpers': 7.29.7
-      '@babel/parser': 7.29.8
+      '@babel/parser': 7.29.11
       '@babel/template': 7.29.7
-      '@babel/traverse': 7.29.8(supports-color@7.2.0)
-      '@babel/types': 7.29.8
+      '@babel/traverse': 7.29.10(supports-color@7.2.0)
+      '@babel/types': 7.29.11
       '@jridgewell/remapping': 2.3.5
       convert-source-map: 2.0.0
       debug: 4.4.3(supports-color@7.2.0)
@@ -6372,8 +6363,8 @@ snapshots:
 
   '@babel/generator@7.29.8':
     dependencies:
-      '@babel/parser': 7.29.8
-      '@babel/types': 7.29.8
+      '@babel/parser': 7.29.11
+      '@babel/types': 7.29.11
       '@jridgewell/gen-mapping': 0.3.13
       '@jridgewell/trace-mapping': 0.3.31
       jsesc: 3.1.0
@@ -6390,8 +6381,8 @@ snapshots:
 
   '@babel/helper-module-imports@7.29.7(supports-color@7.2.0)':
     dependencies:
-      '@babel/traverse': 7.29.8(supports-color@7.2.0)
-      '@babel/types': 7.29.8
+      '@babel/traverse': 7.29.10(supports-color@7.2.0)
+      '@babel/types': 7.29.11
     transitivePeerDependencies:
       - supports-color
 
@@ -6400,7 +6391,7 @@ snapshots:
       '@babel/core': 7.29.7(supports-color@7.2.0)
       '@babel/helper-module-imports': 7.29.7(supports-color@7.2.0)
       '@babel/helper-validator-identifier': 7.29.7
-      '@babel/traverse': 7.29.8(supports-color@7.2.0)
+      '@babel/traverse': 7.29.10(supports-color@7.2.0)
     transitivePeerDependencies:
       - supports-color
 
@@ -6417,7 +6408,7 @@ snapshots:
   '@babel/helpers@7.29.7':
     dependencies:
       '@babel/template': 7.29.7
-      '@babel/types': 7.29.8
+      '@babel/types': 7.29.11
 
   '@babel/parser@7.29.11':
     dependencies:
@@ -6433,13 +6424,13 @@ snapshots:
 
   '@babel/runtime@7.29.7': {}
 
-  '@babel/runtime@8.0.0': {}
+  '@babel/runtime@8.0.8': {}
 
   '@babel/template@7.29.7':
     dependencies:
       '@babel/code-frame': 7.29.7
-      '@babel/parser': 7.29.8
-      '@babel/types': 7.29.8
+      '@babel/parser': 7.29.11
+      '@babel/types': 7.29.11
 
   '@babel/traverse@7.29.10(supports-color@7.2.0)':
     dependencies:
@@ -6448,19 +6439,7 @@ snapshots:
       '@babel/helper-globals': 7.29.7
       '@babel/parser': 7.29.11
       '@babel/template': 7.29.7
-      '@babel/types': 7.29.8
-      debug: 4.4.3(supports-color@7.2.0)
-    transitivePeerDependencies:
-      - supports-color
-
-  '@babel/traverse@7.29.8(supports-color@7.2.0)':
-    dependencies:
-      '@babel/code-frame': 7.29.7
-      '@babel/generator': 7.29.8
-      '@babel/helper-globals': 7.29.7
-      '@babel/parser': 7.29.8
-      '@babel/template': 7.29.7
-      '@babel/types': 7.29.8
+      '@babel/types': 7.29.11
       debug: 4.4.3(supports-color@7.2.0)
     transitivePeerDependencies:
       - supports-color
@@ -8167,13 +8146,13 @@ snapshots:
   '@rolldown/binding-win32-x64-msvc@1.2.15':
     optional: true
 
-  '@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))':
+  '@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.8)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))':
     dependencies:
       '@babel/core': 7.29.7(supports-color@7.2.0)
       picomatch: 4.0.4
       rolldown: 1.2.15
     optionalDependencies:
-      '@babel/runtime': 8.0.0
+      '@babel/runtime': 8.0.8
       vite: 8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0)
 
   '@rolldown/pluginutils@1.0.1': {}
@@ -8925,12 +8904,12 @@ snapshots:
       - '@types/react-dom'
       - react-dom
 
-  '@vitejs/plugin-react@6.1.1(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))':
+  '@vitejs/plugin-react@6.1.1(@rolldown/plugin-babel@0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.8)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0)))(babel-plugin-react-compiler@1.0.0)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))':
     dependencies:
       '@rolldown/pluginutils': 1.0.1
       vite: 8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0)
     optionalDependencies:
-      '@rolldown/plugin-babel': 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.0)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))
+      '@rolldown/plugin-babel': 0.2.3(@babel/core@7.29.7(supports-color@7.2.0))(@babel/runtime@8.0.8)(rolldown@1.2.15)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))
       babel-plugin-react-compiler: 1.0.0
 
   '@vitest/browser-playwright@4.1.11(playwright@1.62.1)(vite@8.2.4(@types/node@24.13.3)(esbuild@0.28.2)(jiti@2.7.0)(sass@1.103.1)(terser@5.46.1)(yaml@2.9.0))(vitest@4.1.11)':
@@ -9055,14 +9034,12 @@ snapshots:
 
   '@webcontainer/env@1.1.1': {}
 
-  acorn-jsx@5.3.2(acorn@8.18.0):
+  acorn-jsx@5.3.2(acorn@8.19.0):
     dependencies:
-      acorn: 8.18.0
+      acorn: 8.19.0
 
   acorn@8.16.0: {}
 
-  acorn@8.18.0: {}
-
   acorn@8.19.0: {}
 
   agent-base@6.0.2(supports-color@7.2.0):
@@ -9733,8 +9710,8 @@ snapshots:
 
   espree@9.6.1:
     dependencies:
-      acorn: 8.18.0
-      acorn-jsx: 5.3.2(acorn@8.18.0)
+      acorn: 8.19.0
+      acorn-jsx: 5.3.2(acorn@8.19.0)
       eslint-visitor-keys: 3.4.3
 
   esprima@4.0.1: {}
@@ -10468,9 +10445,9 @@ snapshots:
 
   matrix-events-sdk@0.0.1: {}
 
-  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/3f05dc4d104a3dfc753c5e3549a18c74fab4b076:
+  matrix-js-sdk@https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/b3f17e3ee8ca53f5625f7d8c482155d5a82ef4a2:
     dependencies:
-      '@babel/runtime': 8.0.0
+      '@babel/runtime': 8.0.8
       '@matrix-org/matrix-sdk-crypto-wasm': 18.9.0
       another-json: 0.2.0
       bs58: 6.0.0
@@ -11701,7 +11678,7 @@ snapshots:
   terser@5.46.1:
     dependencies:
       '@jridgewell/source-map': 0.3.11
-      acorn: 8.18.0
+      acorn: 8.19.0
       commander: 2.20.3
       source-map-support: 0.5.21
 

sdk/SdkArchitecture.md

@@ -538,7 +538,7 @@ backend is handed the whole session's view and gives back media:
 type MemberMediaFields = Pick<RTCMember, "tracks$" | "encryptionError$">;
 
 export interface MediaBackend {
-  readonly transportType: string; // "livekit"
+  readonly transportTypes: readonly string[]; // ["m.livekit", "livekit"]
   /** Authenticate with the transport the client found; the probe for delegation runs here. */
   prepareLocalTransport(
     transport: Transport,

sdk/src/RTCParticipation.test.ts

@@ -164,7 +164,7 @@ function setup(
     context: MediaBackendContext,
   ): MediaBackend => {
     const backend: MediaBackend = {
-      transportType: "livekit",
+      transportTypes: ["m.livekit", "livekit"],
       prepareLocalTransport: async () => fake.prepared.promise,
       delegateDelayedLeave: fake.delegateDelayedLeave,
       local: {

sdk/src/RTCParticipation.ts

@@ -136,7 +136,8 @@ export function createRTCParticipation(
   // fallback: another member's SFU may let us publish (MSC4195). LiveKit only,
   // so it stays out of the backend interface
   const transportFromBackends = async (): Promise<Transport | null> =>
-    backend.transportType === "livekit"
+    backend.transportTypes.includes("m.livekit") ||
+    backend.transportTypes.includes("livekit")
       ? findRemotePublishLivekitTransport({
           client,
           // A snapshot: if nobody with a usable SFU is here yet, the user has
@@ -152,7 +153,7 @@ export function createRTCParticipation(
   const preparedTransport$ = from(
     discoverLocalTransport(
       client,
-      backend.transportType,
+      backend.transportTypes,
       options,
       transportFromBackends,
       logger,

sdk/src/api.ts

@@ -230,7 +230,7 @@ export interface DataMessage {
  * backend-specific developer panel and for connection diagnostics.
  */
 export interface TransportMetadata {
-  /** `"livekit"` today. */
+  /** `"m.livekit"` or `"livekit"` today. */
   type: string;
   /** Stable key, unique per transport in the slot: the raw transport, serialised with sorted keys. */
   id: string;

sdk/src/matrixrtc/LocalTransport.test.ts

@@ -48,7 +48,7 @@ describe("discoverLocalTransport", () => {
     await expect(
       discoverLocalTransport(
         c,
-        "livekit",
+        ["m.livekit", "livekit"],
         { transport: hostTransport },
         fromBackends(),
         logger,
@@ -61,7 +61,7 @@ describe("discoverLocalTransport", () => {
     await expect(
       discoverLocalTransport(
         client([homeserverTransport]),
-        "livekit",
+        ["m.livekit", "livekit"],
         { fallbackTransport: hostTransport },
         fromBackends(),
         logger,
@@ -73,7 +73,7 @@ describe("discoverLocalTransport", () => {
     await expect(
       discoverLocalTransport(
         client([{ type: "not_livekit" }]),
-        "livekit",
+        ["m.livekit", "livekit"],
         { fallbackTransport: hostTransport },
         fromBackends(),
         logger,
@@ -87,7 +87,7 @@ describe("discoverLocalTransport", () => {
     await expect(
       discoverLocalTransport(
         client([homeserverTransport]),
-        "livekit",
+        ["m.livekit", "livekit"],
         {},
         backends,
         logger,
@@ -99,7 +99,7 @@ describe("discoverLocalTransport", () => {
   it("fails naming the homeserver where there is no transport at all", async () => {
     const promise = discoverLocalTransport(
       client([]),
-      "livekit",
+      ["m.livekit", "livekit"],
       {},
       fromBackends(),
       logger,

sdk/src/matrixrtc/LocalTransport.ts

@@ -15,14 +15,15 @@ import { TransportAutoDiscovery } from "./TransportAutoDiscovery";
 
 /**
  * The transport the local member advertises: the one the host names, else the
- * homeserver's first of the type the backend serves, else the host's fallback,
- * else the first the backends can provide, which are asked only then.
+ * homeserver's first of the most preferred type the backend serves, else the
+ * host's fallback, else the first the backends can provide, which are asked
+ * only then.
  *
  * @throws {MatrixRTCTransportMissingError} where none of these exists.
  */
 export async function discoverLocalTransport(
   client: Pick<MatrixClient, "getDomain" | "_unstable_getRTCTransports">,
-  transportType: string,
+  transportTypes: readonly string[],
   {
     transport: override,
     fallbackTransport,
@@ -34,7 +35,7 @@ export async function discoverLocalTransport(
     override ??
     (await new TransportAutoDiscovery({
       client,
-      transportType,
+      transportTypes,
       fallbackTransport,
       logger,
     }).discoverPreferredTransport()) ??

sdk/src/matrixrtc/TransportAutoDiscovery.test.ts

@@ -61,7 +61,7 @@ describe("TransportAutoDiscovery", () => {
 
       const discovery = new TransportAutoDiscovery({
         client,
-        transportType: "livekit",
+        transportTypes: ["m.livekit", "livekit"],
         fallbackTransport: configTransport,
         logger: rootLogger,
       });
@@ -75,6 +75,29 @@ describe("TransportAutoDiscovery", () => {
     },
   );
 
+  it("prefers a transport of an earlier type over one listed before it", async () => {
+    const mLivekit: Transport = {
+      type: "m.livekit",
+      url: "wss://sfu.example.org",
+    };
+    const client = makeClient();
+    client._unstable_getRTCTransports.mockResolvedValue([
+      backendTransport,
+      mLivekit,
+    ]);
+
+    const discovery = new TransportAutoDiscovery({
+      client,
+      transportTypes: ["m.livekit", "livekit"],
+      fallbackTransport: configTransport,
+      logger: rootLogger,
+    });
+
+    await expect(discovery.discoverPreferredTransport()).resolves.toStrictEqual(
+      mLivekit,
+    );
+  });
+
   it("Retries limit_exceeded backend transport", async () => {
     const client = makeClient();
     client._unstable_getRTCTransports
@@ -92,7 +115,7 @@ describe("TransportAutoDiscovery", () => {
 
     const discovery = new TransportAutoDiscovery({
       client,
-      transportType: "livekit",
+      transportTypes: ["m.livekit", "livekit"],
       fallbackTransport: configTransport,
       logger: rootLogger,
     });
@@ -116,7 +139,7 @@ describe("TransportAutoDiscovery", () => {
 
       const discovery = new TransportAutoDiscovery({
         client,
-        transportType: "livekit",
+        transportTypes: ["m.livekit", "livekit"],
         fallbackTransport: configTransport,
         logger: rootLogger,
       });
@@ -133,7 +156,7 @@ describe("TransportAutoDiscovery", () => {
 
     const discovery = new TransportAutoDiscovery({
       client,
-      transportType: "livekit",
+      transportTypes: ["m.livekit", "livekit"],
       fallbackTransport: undefined,
       logger: rootLogger,
     });

sdk/src/matrixrtc/TransportAutoDiscovery.ts

@@ -17,27 +17,27 @@ type TransportDiscoveryClient = Pick<
 
 export interface TransportAutoDiscoveryProps {
   client: TransportDiscoveryClient;
-  /** The transport type the media backend serves. */
-  transportType: string;
-  /** A transport to use when the homeserver advertises none of the type. */
+  /** The transport types the media backend serves, most preferred first. */
+  transportTypes: readonly string[];
+  /** A transport to use when the homeserver advertises none of the types. */
   fallbackTransport?: Transport;
   logger: Logger;
 }
 
 export class TransportAutoDiscovery {
   private readonly client: TransportDiscoveryClient;
-  private readonly transportType: string;
+  private readonly transportTypes: readonly string[];
   private readonly fallbackTransport: Transport | undefined;
   private readonly logger: Logger;
 
   public constructor({
     client,
-    transportType,
+    transportTypes,
     fallbackTransport,
     logger,
   }: TransportAutoDiscoveryProps) {
     this.client = client;
-    this.transportType = transportType;
+    this.transportTypes = transportTypes;
     this.fallbackTransport = fallbackTransport;
     this.logger = logger.getChild("[TransportAutoDiscovery]");
   }
@@ -64,7 +64,7 @@ export class TransportAutoDiscovery {
   }
 
   /**
-   * Fetches the first transport of the backend's type from the homeserver.
+   * Fetches the first transport of the backend's most preferred type from the homeserver.
    * This will not throw errors, but instead just log them and return null if the expected config is not found or malformed.
    * @private
    */
@@ -76,17 +76,16 @@ export class TransportAutoDiscovery {
       const transportList = await doNetworkOperationWithRetry(async () =>
         client._unstable_getRTCTransports(),
       );
-      const first = transportList.find(
-        (transport) => transport.type === this.transportType,
-      );
-      if (first) {
-        return first;
-      } else {
-        this.logger.info(
-          `No ${this.transportType} transport found in getRTCTransports end point`,
-          transportList,
+      for (const type of this.transportTypes) {
+        const first = transportList.find(
+          (transport) => transport.type === type,
         );
+        if (first) return first;
       }
+      this.logger.info(
+        `No ${this.transportTypes.join(" or ")} transport found in getRTCTransports end point`,
+        transportList,
+      );
     } catch (ex) {
       this.logger.info(`Failed to use getRTCTransports end point: ${ex}`);
     }

sdk/src/media-backend/api.ts

@@ -113,8 +113,11 @@ export interface DataPacket {
 }
 
 export interface MediaBackend {
-  /** The membership transport type this backend serves: "livekit". */
-  readonly transportType: string;
+  /**
+   * The membership transport types this backend serves, ordered decreasingly
+   * by preference.
+   */
+  readonly transportTypes: readonly string[];
 
   /**
    * Makes `transport` usable as the one the local member publishes on. The

sdk/src/media-backend/livekit/LivekitBackend.ts

@@ -271,7 +271,7 @@ export function createLivekitBackend(
   });
 
   return {
-    transportType: "livekit",
+    transportTypes: ["m.livekit", "livekit"],
     prepareLocalTransport,
     delegateDelayedLeave: delegateLeave,
     local: localMedia_,

sdk/src/media-backend/livekit/RemotePublishTransport.ts

@@ -13,6 +13,7 @@ import {
 } from "matrix-js-sdk/lib/matrixrtc";
 import { type CallMembershipIdentityParts } from "matrix-js-sdk/lib/matrixrtc/EncryptionManager";
 
+import { serverNameOfTransport } from "../../utils/serverName";
 import { isCsApiUnavailable } from "./auth";
 import * as csApi from "./auth/csApi";
 import { decodeSFUJWTPayload } from "./auth/types";
@@ -59,7 +60,7 @@ export async function findRemotePublishLivekitTransport({
       if (!isUnstableLivekitTransport(transport) || !("url" in transport))
         continue;
       const { url } = transport;
-      const serverName = membership.getTransportServerName(transport);
+      const serverName = serverNameOfTransport(transport, membership.userId);
       const key = JSON.stringify([url, serverName]);
       if (tried.has(key)) continue;
       tried.add(key);