Add ability to publish h265 bytestream via tcp or unix socket

README.md

@@ -191,6 +191,8 @@ lk room join --identity bot \
 
 You should now see both video and audio tracks published to the room.
 
+Note: To publish H.265/HEVC over sockets, use the `h265://` scheme (for example, `h265:///tmp/myvideo.sock` or `h265://127.0.0.1:16400`). Ensure your LiveKit deployment and clients support H.265 playback.
+
 ### Publish from TCP (i.e. gstreamer)
 
 It's possible to publish from video streams coming over a TCP socket. `lk` can act as a TCP client. For example, with a gstreamer pipeline ending in `! tcpserversink port=16400` and streaming H.264.
@@ -204,11 +206,11 @@ lk room join \
   <room_name>
 ```
 
-### Publish H.264 simulcast track from TCP
+### Publish H.264/H.265 simulcast track from TCP
 
-You can publish multiple H.264 video tracks from different TCP ports as a single [Simulcast](https://docs.livekit.io/home/client/tracks/advanced/#video-simulcast) track.  This is done by using multiple `--publish` flags.
+You can publish multiple H.264 or H.265 video tracks from different TCP ports as a single [Simulcast](https://docs.livekit.io/home/client/tracks/advanced/#video-simulcast) track. This is done by using multiple `--publish` flags.
 
-The track will be published in simulcast mode if multiple `--publish` flags with the syntax `h264://<host>:<port>/<width>x<height>` are passed in as arguments.
+The track will be published in simulcast mode if multiple `--publish` flags with the syntax `<codec>://<host>:<port>/<width>x<height>` are passed in as arguments, where `<codec>` is `h264` or `h265`. All layers must use the same codec.
 
 Example:
 
@@ -239,7 +241,7 @@ lk room join --identity <name> --url "<url>" --api-key "<key>" --api-secret "<se
 ```
 
 Notes:
-- LiveKit CLI can only publish simulcast tracks using H.264 codec.
+- LiveKit CLI can publish simulcast tracks using H.264 or H.265. Ensure your LiveKit deployment and clients support the chosen codec (HEVC/H.265 support varies by platform/browser).
 - You can only use multiple `--publish` flags to create a simulcast track.
 - Using more than 1 `--publish` flag for other types of streams will not work.
 - Tracks will automatically be set to HIGH/MED/LOW resolution based on the order of their width.
@@ -248,7 +250,7 @@ Notes:
 ### Publish streams from your application
 
 Using unix sockets, it's also possible to publish streams from your application. The tracks need to be encoded into
-a format that WebRTC clients could playback (VP8, H.264, and Opus).
+a format that WebRTC clients could playback (VP8, H.264, H.265, and Opus).
 
 Once you are writing to the socket, you could use `ffplay` to test the stream.
 

cmd/lk/join.go

@@ -59,7 +59,7 @@ var (
 					TakesFile: true,
 					Usage: "`FILES` to publish as tracks to room (supports .h264, .ivf, .ogg). " +
 						"can be used multiple times to publish multiple files. " +
-						"can publish from Unix or TCP socket using the format '<codec>://<socket_name>' or '<codec>://<host:address>' respectively. Valid codecs are \"h264\", \"vp8\", \"opus\"",
+						"can publish from Unix or TCP socket using the format '<codec>://<socket_name>' or '<codec>://<host:address>' respectively. Valid codecs are \"h264\", \"h265\", \"vp8\", \"opus\"",
 				},
 				&cli.FloatFlag{
 					Name:  "fps",
@@ -297,7 +297,7 @@ func parseSocketFromName(name string) (string, string, string, error) {
 
 	mimeType := name[:offset]
 
-	if mimeType != "h264" && mimeType != "vp8" && mimeType != "opus" {
+	if mimeType != "h264" && mimeType != "h265" && mimeType != "vp8" && mimeType != "opus" {
 		return "", "", "", fmt.Errorf("unsupported mime type: %s", mimeType)
 	}
 
@@ -331,6 +331,8 @@ func publishSocket(room *lksdk.Room,
 	switch {
 	case strings.Contains(mimeType, "h264"):
 		mime = webrtc.MimeTypeH264
+	case strings.Contains(mimeType, "h265"):
+		mime = webrtc.MimeTypeH265
 	case strings.Contains(mimeType, "vp8"):
 		mime = webrtc.MimeTypeVP8
 	case strings.Contains(mimeType, "opus"):
@@ -397,20 +399,22 @@ func publishReader(room *lksdk.Room,
 
 // simulcastURLParts represents the parsed components of a simulcast URL
 type simulcastURLParts struct {
+	codec   string // "h264" or "h265"
 	network string // "tcp" or "unix"
 	address string
 	width   uint32
 	height  uint32
 }
 
-// parseSimulcastURL validates and parses a simulcast URL in the format h264://<host:port>/<width>x<height> or h264://<socket_path>/<width>x<height>
+// parseSimulcastURL validates and parses a simulcast URL in the format <codec>://<host:port>/<width>x<height> or <codec>://<socket_path>/<width>x<height>
 func parseSimulcastURL(url string) (*simulcastURLParts, error) {
 	matches := simulcastURLRegex.FindStringSubmatch(url)
 	if matches == nil {
-		return nil, fmt.Errorf("simulcast URL must be in format h264://<host:port>/<width>x<height> or h264://<socket_path>/<width>x<height>, got: %s", url)
+		return nil, fmt.Errorf("simulcast URL must be in format <codec>://<host:port>/<width>x<height> or <codec>://<socket_path>/<width>x<height> where codec is h264 or h265, got: %s", url)
 	}
 
-	address, widthStr, heightStr := matches[1], matches[2], matches[3]
+	codec := matches[1]
+	address, widthStr, heightStr := matches[2], matches[3], matches[4]
 
 	// Parse dimensions
 	width, err := strconv.ParseUint(widthStr, 10, 32)
@@ -429,14 +433,15 @@ func parseSimulcastURL(url string) (*simulcastURLParts, error) {
 	}
 
 	return &simulcastURLParts{
+		codec:   codec,
 		network: network,
 		address: address,
 		width:   uint32(width),
 		height:  uint32(height),
 	}, nil
 }
 
-// createSimulcastVideoTrack creates a simulcast video track from a TCP or Unix socket H.264 streams
+// createSimulcastVideoTrack creates a simulcast video track from a TCP or Unix socket H.264/H.265 streams
 func createSimulcastVideoTrack(urlParts *simulcastURLParts, quality livekit.VideoQuality, fps float64, h26xStreamingFormat string, onComplete func()) (*lksdk.LocalTrack, error) {
 	conn, err := net.Dial(urlParts.network, urlParts.address)
 	if err != nil {
@@ -472,10 +477,14 @@ func createSimulcastVideoTrack(urlParts *simulcastURLParts, quality livekit.Vide
 		Height:  urlParts.height,
 	})))
 
-	return lksdk.NewLocalReaderTrack(conn, webrtc.MimeTypeH264, opts...)
+	mime := webrtc.MimeTypeH264
+	if urlParts.codec == "h265" {
+		mime = webrtc.MimeTypeH265
+	}
+	return lksdk.NewLocalReaderTrack(conn, mime, opts...)
 }
 
-// simulcastLayer represents a parsed H.264 stream with quality info
+// simulcastLayer represents a parsed H.264/H.265 stream with quality info
 type simulcastLayer struct {
 	url     string
 	parts   *simulcastURLParts
@@ -504,6 +513,14 @@ func handleSimulcastPublish(room *lksdk.Room, urls []string, fps float64, h26xSt
 		return fmt.Errorf("no valid simulcast URLs provided")
 	}
 
+	// Ensure all layers use the same codec
+	codec := layers[0].parts.codec
+	for _, l := range layers[1:] {
+		if l.parts.codec != codec {
+			return fmt.Errorf("all simulcast layers must use the same codec; expected %s, found %s", codec, l.parts.codec)
+		}
+	}
+
 	// Sort streams by width to determine quality levels
 	sort.Slice(layers, func(i, j int) bool {
 		return layers[i].parts.width < layers[j].parts.width
@@ -573,6 +590,6 @@ func handleSimulcastPublish(room *lksdk.Room, urls []string, fps float64, h26xSt
 		return fmt.Errorf("failed to publish simulcast track: %w", err)
 	}
 
-	fmt.Printf("Successfully published H.264 simulcast track with qualities: %v\n", trackNames)
+	fmt.Printf("Successfully published %s simulcast track with qualities: %v\n", strings.ToUpper(codec), trackNames)
 	return nil
 }

cmd/lk/join_test.go

@@ -88,6 +88,7 @@ func TestParseSimulcastURL(t *testing.T) {
 	// Test TCP format
 	parts, err := parseSimulcastURL("h264://localhost:8080/640x480")
 	assert.NoError(t, err, "Expected no error for valid TCP simulcast URL")
+	assert.Equal(t, "h264", parts.codec)
 	assert.Equal(t, "tcp", parts.network)
 	assert.Equal(t, "localhost:8080", parts.address)
 	assert.Equal(t, uint32(640), parts.width)
@@ -96,6 +97,7 @@ func TestParseSimulcastURL(t *testing.T) {
 	// Test Unix socket format with multiple slashes
 	parts, err = parseSimulcastURL("h264:///tmp/my.socket/1280x720")
 	assert.NoError(t, err, "Expected no error for valid Unix socket simulcast URL")
+	assert.Equal(t, "h264", parts.codec)
 	assert.Equal(t, "unix", parts.network)
 	assert.Equal(t, "/tmp/my.socket", parts.address)
 	assert.Equal(t, uint32(1280), parts.width)
@@ -104,6 +106,7 @@ func TestParseSimulcastURL(t *testing.T) {
 	// Test Unix socket format with nested paths
 	parts, err = parseSimulcastURL("h264:///tmp/deep/nested/path/my.socket/1920x1080")
 	assert.NoError(t, err, "Expected no error for valid nested path Unix socket simulcast URL")
+	assert.Equal(t, "h264", parts.codec)
 	assert.Equal(t, "unix", parts.network)
 	assert.Equal(t, "/tmp/deep/nested/path/my.socket", parts.address)
 	assert.Equal(t, uint32(1920), parts.width)
@@ -112,17 +115,35 @@ func TestParseSimulcastURL(t *testing.T) {
 	// Test simple socket name without path
 	parts, err = parseSimulcastURL("h264://mysocket/640x480")
 	assert.NoError(t, err, "Expected no error for simple socket name")
+	assert.Equal(t, "h264", parts.codec)
 	assert.Equal(t, "unix", parts.network)
 	assert.Equal(t, "mysocket", parts.address)
 	assert.Equal(t, uint32(640), parts.width)
 	assert.Equal(t, uint32(480), parts.height)
 
+	// H265 variants
+	parts, err = parseSimulcastURL("h265://localhost:8080/640x480")
+	assert.NoError(t, err, "Expected no error for valid TCP simulcast URL (h265)")
+	assert.Equal(t, "h265", parts.codec)
+	assert.Equal(t, "tcp", parts.network)
+	assert.Equal(t, "localhost:8080", parts.address)
+	assert.Equal(t, uint32(640), parts.width)
+	assert.Equal(t, uint32(480), parts.height)
+
+	parts, err = parseSimulcastURL("h265:///tmp/my.socket/1280x720")
+	assert.NoError(t, err, "Expected no error for valid Unix socket simulcast URL (h265)")
+	assert.Equal(t, "h265", parts.codec)
+	assert.Equal(t, "unix", parts.network)
+	assert.Equal(t, "/tmp/my.socket", parts.address)
+	assert.Equal(t, uint32(1280), parts.width)
+	assert.Equal(t, uint32(720), parts.height)
+
 	// Test invalid format
 	_, err = parseSimulcastURL("h264://localhost:8080")
 	assert.Error(t, err, "Expected error for URL without dimensions")
 
 	_, err = parseSimulcastURL("opus:///tmp/socket/640x480")
-	assert.Error(t, err, "Expected error for non-h264 protocol")
+	assert.Error(t, err, "Expected error for non-h264/h265 protocol")
 
 	_, err = parseSimulcastURL("h264:///tmp/socket/invalidxinvalid")
 	assert.Error(t, err, "Expected error for invalid dimensions")

cmd/lk/room.go

@@ -38,8 +38,8 @@ import (
 )
 
 var (
-	// simulcastURLRegex matches h264 simulcast URLs in format h264://<host:port>/<width>x<height> or h264://<socket_path>/<width>x<height>
-	simulcastURLRegex = regexp.MustCompile(`^h264://(.+)/(\d+)x(\d+)$`)
+	// simulcastURLRegex matches h264 or h265 simulcast URLs in format <codec>://<host:port>/<width>x<height> or <codec>://<socket_path>/<width>x<height>
+	simulcastURLRegex = regexp.MustCompile(`^(h264|h265)://(.+)/(\d+)x(\d+)$`)
 
 	RoomCommands = []*cli.Command{
 		{
@@ -157,8 +157,8 @@ var (
 							TakesFile: true,
 							Usage: "`FILES` to publish as tracks to room (supports .h264, .ivf, .ogg). " +
 								"Can be used multiple times to publish multiple files. " +
-								"Can publish from Unix or TCP socket using the format '<codec>:///<socket_path>' or '<codec>://<host:port>' respectively. Valid codecs are \"h264\", \"vp8\", \"opus\". " +
-								"For simulcast: use 2-3 h264:// URLs with format 'h264://<host:port>/<width>x<height>' or 'h264:///path/to/<socket_path>/<width>x<height>' (quality determined by width order)",
+								"Can publish from Unix or TCP socket using the format '<codec>:///<socket_path>' or '<codec>://<host:port>' respectively. Valid codecs are \"h264\", \"h265\", \"vp8\", \"opus\". " +
+								"For simulcast: use 2-3 h264:// or h265:// URLs with format '<codec>://<host:port>/<width>x<height>' or '<codec>:///path/to/<socket_path>/<width>x<height>' (all layers must use the same codec; quality determined by width order)",
 						},
 						&cli.StringFlag{
 							Name:  "publish-data",
@@ -828,19 +828,22 @@ func joinRoom(ctx context.Context, cmd *cli.Command) error {
 		return fmt.Errorf("no more than 3 --publish flags can be specified, got %d", len(publishUrls))
 	}
 
-	// If simulcast mode, validate all URLs are h264 format with dimensions
+	// If simulcast mode, validate all URLs are h264 or h265 format with dimensions
 	if simulcastMode {
 		if len(publishUrls) == 1 {
 			return fmt.Errorf("simulcast mode requires 2-3 streams, but only 1 was provided")
 		}
+		var firstCodec string
 		for i, url := range publishUrls {
-			if !strings.HasPrefix(url, "h264://") {
-				return fmt.Errorf("publish flag %d: simulcast mode requires h264:// URLs with dimensions (format: h264://host:port/widthxheight), got: %s", i+1, url)
-			}
-			// Validate the format has dimensions
-			if _, err := parseSimulcastURL(url); err != nil {
+			parts, err := parseSimulcastURL(url)
+			if err != nil {
 				return fmt.Errorf("publish flag %d: %w", i+1, err)
 			}
+			if i == 0 {
+				firstCodec = parts.codec
+			} else if parts.codec != firstCodec {
+				return fmt.Errorf("publish flag %d: simulcast layers must use the same codec; expected %s://, got %s://", i+1, firstCodec, parts.codec)
+			}
 		}
 	}