Cast: Increase UDP socket send buffer size

media/cast/net/udp_transport.cc

Index: media/cast/net/udp_transport.cc
diff --git a/media/cast/net/udp_transport.cc b/media/cast/net/udp_transport.cc
index fa9be469ed4a255117a2879577ecc271bf793f89..738afb048c049725c30ae1c8294e862774dfb4e0 100644
--- a/media/cast/net/udp_transport.cc
+++ b/media/cast/net/udp_transport.cc
@@ -42,6 +42,7 @@ UdpTransport::UdpTransport(
     const scoped_refptr<base::SingleThreadTaskRunner>& io_thread_proxy,
     const net::IPEndPoint& local_end_point,
     const net::IPEndPoint& remote_end_point,
+    int32 send_buffer_size,

[miu, 2014/10/16 18:31:57]

s/int32/int/

     const CastTransportStatusCallback& status_callback)
     : io_thread_proxy_(io_thread_proxy),
       local_addr_(local_end_point),
@@ -54,6 +55,7 @@ UdpTransport::UdpTransport(
       receive_pending_(false),
       client_connected_(false),
       next_dscp_value_(net::DSCP_NO_CHANGE),
+      send_buffer_size_(send_buffer_size),
       status_callback_(status_callback),
       bytes_sent_(0),
       weak_factory_(this) {
@@ -85,6 +87,9 @@ void UdpTransport::StartReceiving(
   } else {
     NOTREACHED() << "Either local or remote address has to be defined.";
   }
+  if (udp_socket_->SetSendBufferSize(send_buffer_size_) != net::OK) {
+    VLOG(1) << "Failed to set socket send buffer size.";

[miu, 2014/10/16 18:31:57]

Perhaps this should be LOG(WARNING) or, if we believe we are setting a value
within the allowed range for the operating system: LOG(ERROR).  Seems like with
VLOG(1) it would be too easy to accidentally conceal this error.

[Alpha Left Google, 2014/10/16 18:41:27]

Done.

+  }
 
   ScheduleReceiveNextPacket();
 }