Added piping for sending audio packets from host to client.

remoting/protocol/connection_to_client.cc

Index: remoting/protocol/connection_to_client.cc
diff --git a/remoting/protocol/connection_to_client.cc b/remoting/protocol/connection_to_client.cc
index 03ee1fec34bf4da5915c2a05a5a0451352f64e6e..e054afd448852f38485c53d3f279d1e804520d9e 100644
--- a/remoting/protocol/connection_to_client.cc
+++ b/remoting/protocol/connection_to_client.cc
@@ -68,6 +68,11 @@ VideoStub* ConnectionToClient::video_stub() {
   return video_writer_.get();
 }
 
+AudioStub* ConnectionToClient::audio_stub() {
+  DCHECK(CalledOnValidThread());
+  return audio_writer_.get();
+}
+
 // Return pointer to ClientStub.
 ClientStub* ConnectionToClient::client_stub() {
   DCHECK(CalledOnValidThread());
@@ -120,6 +125,12 @@ void ConnectionToClient::OnSessionStateChange(Session::State state) {
       video_writer_->Init(session_.get(), base::Bind(
           &ConnectionToClient::OnChannelInitialized, base::Unretained(this)));
 
+      audio_writer_ = AudioWriter::Create(session_->config());
+      if (audio_writer_ != NULL) {

[Wez, 2012/06/22 18:29:53]

nit: if (audio_writer_.get()) seems clearer here, since audio_writer_ is a
scoped_ptr<>, not a bare pointer. Consider adding a comment to indicate that the
audio channel is optional.

[kxing, 2012/06/22 19:12:31]

Done.

+        audio_writer_->Init(session_.get(), base::Bind(
+            &ConnectionToClient::OnChannelInitialized, base::Unretained(this)));
+      }
+
       // Notify the handler after initializing the channels, so that
       // ClientSession can get a client clipboard stub.
       handler_->OnConnectionAuthenticated(this);
@@ -158,7 +169,9 @@ void ConnectionToClient::NotifyIfChannelsReady() {
 
   if (control_dispatcher_.get() && control_dispatcher_->is_connected() &&
       event_dispatcher_.get() && event_dispatcher_->is_connected() &&
-      video_writer_.get() && video_writer_->is_connected()) {
+      video_writer_.get() && video_writer_->is_connected() &&
+      (!session_->config().is_audio_enabled() ||
+      (audio_writer_.get() && audio_writer_->is_connected()))) {

[Wez, 2012/06/22 18:29:53]

nit: This if has become silly; we should re-express this as a series of
early-exits, i.e.

if (!control_dispatcher_.get() || !control_dispatcher_.is_connected())
  return;
...

[kxing, 2012/06/22 19:12:31]

Done.

     handler_->OnConnectionChannelsConnected(this);
   }
 }
@@ -172,6 +185,7 @@ void ConnectionToClient::CloseChannels() {
   control_dispatcher_.reset();
   event_dispatcher_.reset();
   video_writer_.reset();
+  audio_writer_.reset();
 }
 
 }  // namespace protocol