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

remoting/host/chromoting_host.cc

Index: remoting/host/chromoting_host.cc
diff --git a/remoting/host/chromoting_host.cc b/remoting/host/chromoting_host.cc
index c2f8f974b460d13fac0cc8cc4f266e62b90bfb5a..77100eb24a2d5ee02b1a93a2c80a2556d9ed8203 100644
--- a/remoting/host/chromoting_host.cc
+++ b/remoting/host/chromoting_host.cc
@@ -81,6 +81,16 @@ ChromotingHost::ChromotingHost(
   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() {