chore: add fromMap/toMap.

Author: cloudwebrtc

lib/src/rtc_rtp_capabilities.dart

@@ -4,20 +4,73 @@ class RTCRtpCodecCapability {
       required this.clockRate,
       required this.mimeType,
       this.sdpFmtpLine});
+  factory RTCRtpCodecCapability.fromMap(Map<dynamic, dynamic> map) {
+    return RTCRtpCodecCapability(
+      channels: map['channels'],
+      clockRate: map['clockRate'],
+      mimeType: map['mimeType'],
+      sdpFmtpLine: map['sdpFmtpLine'],
+    );
+  }
   num? channels;
   num clockRate;
   String mimeType;
   String? sdpFmtpLine;
+  Map<String, dynamic> toMap() {
+    return {
+      'channels': channels,
+      'clockRate': clockRate,
+      'mimeType': mimeType,
+      if (sdpFmtpLine != null) 'sdpFmtpLine': sdpFmtpLine,
+    };
+  }
 }
 
 class RTCRtpHeaderExtensionCapability {
   RTCRtpHeaderExtensionCapability(this.uri);
+  factory RTCRtpHeaderExtensionCapability.fromMap(Map<dynamic, dynamic> map) {
+    return RTCRtpHeaderExtensionCapability(map['uri']);
+  }
   String uri;
+  Map<String, dynamic> toMap() {
+    return {
+      'uri': uri,
+    };
+  }
 }
 
 class RTCRtpCapabilities {
   RTCRtpCapabilities({this.codecs, this.headerExtensions, this.fecMechanisms});
+  factory RTCRtpCapabilities.fromMap(Map<dynamic, dynamic> map) {
+    var codecs = <RTCRtpCodecCapability>[];
+    dynamic codecsMap = map['codecs'];
+    codecsMap.forEach((params) {
+      codecs.add(RTCRtpCodecCapability.fromMap(params));
+    });
+    var headerExtensions = <RTCRtpHeaderExtensionCapability>[];
+    dynamic headerExtensionsMap = map['headerExtensions'];
+    headerExtensionsMap.forEach((params) {
+      headerExtensions.add(RTCRtpHeaderExtensionCapability.fromMap(params));
+    });
+    var fecMechanisms = <String>[];
+    dynamic fecMechanismsMap = map['fecMechanisms'];
+    fecMechanismsMap.forEach((params) {
+      fecMechanisms.add(params);
+    });
+    return RTCRtpCapabilities(
+        codecs: codecs,
+        headerExtensions: headerExtensions,
+        fecMechanisms: fecMechanisms);
+  }
   List<RTCRtpCodecCapability>? codecs;
   List<RTCRtpHeaderExtensionCapability>? headerExtensions;
   List<String>? fecMechanisms;
+
+  Map<String, dynamic> toMap() {
+    return {
+      'codecs': codecs?.map((e) => e.toMap()).toList(),
+      'headerExtensions': headerExtensions?.map((e) => e.toMap()).toList(),
+      'fecMechanisms': fecMechanisms,
+    };
+  }
 }