Disable audio when audio capturer is not available on the host platform.

remoting/host/chromoting_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/chromoting_host.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
@@ skipping 63 matching lines @@
       stopping_recorders_(0),
       state_(kInitial),
       protocol_config_(protocol::CandidateSessionConfig::CreateDefault()),
       login_backoff_(&kDefaultBackoffPolicy),
       authenticating_client_(false),
       reject_authenticating_client_(false) {
   DCHECK(context_);
   DCHECK(signal_strategy);
   DCHECK(desktop_environment_);
   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
+
+  if (!desktop_environment_->audio_capturer()) {
+    // Disable audio by setting NONE channel config for the audio channel when
+    // we don't have audio capturer.

[Wez, 2012/08/18 00:51:09]

nit: "Disable audio by replacing our list of supported audio configurations with
the NONE config."

[Sergey Ulanov, 2012/08/18 01:43:14]

Done.

+    protocol_config_->mutable_audio_configs()->clear();
+    protocol_config_->mutable_audio_configs()->push_back(
+        protocol::ChannelConfig(protocol::ChannelConfig::TRANSPORT_NONE,
+                                protocol::kDefaultStreamVersion,
+                                protocol::ChannelConfig::CODEC_VERBATIM));
+  }
 }
 
 ChromotingHost::~ChromotingHost() {
   DCHECK(clients_.empty());
 }
 
 void ChromotingHost::Start() {
   DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
 
   LOG(INFO) << "Starting host";
@@ skipping 394 matching lines @@
                     OnShutdown());
 
   for (std::vector<base::Closure>::iterator it = shutdown_tasks_.begin();
        it != shutdown_tasks_.end(); ++it) {
     it->Run();
   }
   shutdown_tasks_.clear();
 }
 
 }  // namespace remoting