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