Add video bitrate setting for HomeKit source

internal/homekit/homekit.go

@@ -133,12 +133,19 @@ func Init() {
 var log zerolog.Logger
 var servers map[string]*server
 
-func streamHandler(url string) (core.Producer, error) {
+func streamHandler(rawURL string) (core.Producer, error) {
 	if srtp.Server == nil {
 		return nil, errors.New("homekit: can't work without SRTP server")
 	}
 
-	return homekit.Dial(url, srtp.Server)
+	rawURL, rawQuery, _ := strings.Cut(rawURL, "#")
+	client, err := homekit.Dial(rawURL, srtp.Server)
+	if client != nil && rawQuery != "" {
+		query := streams.ParseQuery(rawQuery)
+		client.Bitrate = parseBitrate(query.Get("bitrate"))
+	}
+
+	return client, err
 }
 
 func hapPairSetup(w http.ResponseWriter, r *http.Request) {
@@ -199,3 +206,24 @@ func findHomeKitURL(stream *streams.Stream) string {
 
 	return ""
 }
+
+func parseBitrate(s string) int {
+	n := len(s)
+	if n == 0 {
+		return 0
+	}
+
+	var k int
+	switch n--; s[n] {
+	case 'K':
+		k = 1024
+		s = s[:n]
+	case 'M':
+		k = 1024 * 1024
+		s = s[:n]
+	default:
+		k = 1
+	}
+
+	return k * core.Atoi(s)
+}