1 files changed, 6 insertions, 1 deletions
diff --git a/cast/streaming/offer_messages.h b/cast/streaming/offer_messages.h
index efb3a1f6..80458954 100644
--- a/cast/streaming/offer_messages.h
+++ b/cast/streaming/offer_messages.h
@@ -46,6 +46,9 @@ constexpr int kDefaultNumAudioChannels = 2;
 struct Stream {
   enum class Type : uint8_t { kAudioSource, kVideoSource };
 
+  static Error TryParse(const Json::Value& root,
+                        Stream::Type type,
+                        Stream* out);
   Json::Value ToJson() const;
   bool IsValid() const;
 
@@ -68,6 +71,7 @@ struct Stream {
 };
 
 struct AudioStream {
+  static Error TryParse(const Json::Value& root, AudioStream* out);
   Json::Value ToJson() const;
   bool IsValid() const;
 
@@ -78,6 +82,7 @@ struct AudioStream {
 
 
 struct VideoStream {
+  static Error TryParse(const Json::Value& root, VideoStream* out);
   Json::Value ToJson() const;
   bool IsValid() const;
 
@@ -95,7 +100,7 @@ struct VideoStream {
 enum class CastMode : uint8_t { kMirroring, kRemoting };
 
 struct Offer {
-  static ErrorOr<Offer> Parse(const Json::Value& root);
+  static Error TryParse(const Json::Value& root, Offer* out);
   Json::Value ToJson() const;
   bool IsValid() const;