Add a virtual beamforming audio device on ChromeOS.

chromeos/audio/cras_audio_handler.cc

Index: chromeos/audio/cras_audio_handler.cc
diff --git a/chromeos/audio/cras_audio_handler.cc b/chromeos/audio/cras_audio_handler.cc
index 8ee6009f35c69e6ee1ec3070716b5bf75654fd30..3ce04ad7bea07b74e9fa9eef28d436a7227dcf28 100644
--- a/chromeos/audio/cras_audio_handler.cc
+++ b/chromeos/audio/cras_audio_handler.cc
@@ -10,6 +10,7 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
+#include "base/sys_info.h"

[aluebs-chromium, 2015/08/28 19:14:29]

Does this need to be guarded by #if defined(OS_CHROMEOS)?

[ajm, 2015/08/28 23:38:31]

See below.

 #include "chromeos/audio/audio_devices_pref_handler.h"
 #include "chromeos/audio/audio_devices_pref_handler_stub.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
@@ -864,6 +865,22 @@ void CrasAudioHandler::UpdateDevicesAndSwitchActive(
   size_t new_input_device_size = 0;
   for (size_t i = 0; i < nodes.size(); ++i) {
     AudioDevice device(nodes[i]);
+
+    // TODO(ajm): This is a temporary proof-of-concept hack. These values should

[Henrik Grunell, 2015/08/27 08:38:18]

Do you intend to fix the todo before landing?

[ajm, 2015/08/28 07:36:13]

I wasn't going to, but it looks like Hsin-yu might land the needed CRAS CLs
before this one. If not, I intend to keep it like this until they do land.

[Henrik Grunell, 2015/08/28 15:04:34]

Acknowledged.

+    // come from the cras configs for each board.
+    if (device.type == AUDIO_TYPE_INTERNAL_MIC) {
+      const std::string& board = base::SysInfo::GetLsbReleaseBoard();

[aluebs-chromium, 2015/08/28 19:14:30]

Does this need to be guarded by #if defined(OS_CHROMEOS)?

[ajm, 2015/08/28 23:38:31]

This should only run on ChromeOS so I don't think so. The trybots don't have a
problem with it.

[aluebs-chromium, 2015/08/29 00:00:26]

Great! :)

+      if (board.find("nyan_kitty") != std::string::npos) {
+        device.mic_positions = "-0.03 0 0 0.03 0 0";
+      } else if (board.find("peach_pi") != std::string::npos) {
+        device.mic_positions = "-0.025 0 0 0.025 0 0";
+      } else if (board.find("samus") != std::string::npos) {
+        device.mic_positions = "-0.032 0 0 0.032 0 0";
+      } else if (board.find("swanky") != std::string::npos) {
+        device.mic_positions = "-0.026 0 0 0.026 0 0";
+      }
+    }
+
     audio_devices_[device.id] = device;
 
     if (!has_alternative_input_ &&