Internal change

PiperOrigin-RevId: 339915271
Change-Id: I59caf1e22f011b1de6a37145a84fbd88097abc87
Reviewed-on: https://chromium-review.googlesource.com/c/openscreen/+/2533504
Reviewed-by: Ryan Keane <rwkeane@google.com>
Commit-Queue: Ryan Keane <rwkeane@google.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/cast/cast_core/api/web/message_channel.proto b/cast/cast_core/api/web/message_channel.proto
index 57778400..68c41c62 100644
--- a/cast/cast_core/api/web/message_channel.proto
+++ b/cast/cast_core/api/web/message_channel.proto
@@ -13,7 +13,7 @@ message Message {
     ChannelStatus error = 3;
   }
 
-  MessagePortDescriptor sender = 4;
+  MessageChannelDescriptor channel = 4;
 }
 
 message MessageChannelDescriptor {
@@ -29,6 +29,12 @@ message MessageResponse {
   bool result = 1;
 }
 
+// MessagePortDescriptor is used to transfer ownership of a port across the
+// MessageChannel. After port transfer, Messages may be sent to and from the
+// port by using same |channel|, which must be unique to each entangled
+// port pair. Pairs from Cast Core start with |channel_id| of 0x80000000 and
+// increment by one for each pair; pairs generated by a runtime should start
+// at 0x0 and increment by one to avoid collisions.
 message MessagePortDescriptor {
   MessageChannelDescriptor channel = 1;
   uint32 sequence_number = 2;
@@ -41,4 +47,4 @@ message ChannelStatus {
   }
 
   Status status = 1;
-}
\ No newline at end of file
+}