Check keyboard mic on LaCrOS

Check whether there is a keyboard mic. If yes, adding keyboard mic
effect on lacros-chrome.

BUG=b:173113548

Change-Id: I5241c11031cd5f681380f091dac23fbc82b3d75f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536661
Commit-Queue: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828176}

media/audio/cras/audio_manager_cras.cc

@@ -92,6 +92,9 @@ AudioParameters AudioManagerCras::GetInputStreamParameters(
       AudioParameters::HardwareCapabilities(limits::kMinAudioBufferSize,
                                             limits::kMaxAudioBufferSize));
 
+  if (CrasHasKeyboardMic())
+    params.set_effects(AudioParameters::KEYBOARD_MIC);
+
   // Allow experimentation with system echo cancellation with all devices,
   // but enable it by default on devices that actually support it.
   params.set_effects(params.effects() |

media/audio/cras/cras_util.cc

@@ -18,6 +18,7 @@ namespace {
 const char kInternalInputVirtualDevice[] = "Built-in mic";
 const char kInternalOutputVirtualDevice[] = "Built-in speaker";
 const char kHeadphoneLineOutVirtualDevice[] = "Headphone/Line Out";
+const char kKeyBoardMic[] = "KEYBOARD_MIC";
 
 // Returns if that an input or output audio device is for simple usage like
 // playback or recording for user. In contrast, audio device such as loopback,
@@ -143,6 +144,29 @@ std::vector<CrasDevice> CrasGetAudioDevices(DeviceType type) {
   return devices;
 }
 
+bool CrasHasKeyboardMic() {
+  cras_client* client = CrasConnect();
+  if (!client)
+    return false;
+
+  struct cras_iodev_info devs[CRAS_MAX_IODEVS];
+  struct cras_ionode_info nodes[CRAS_MAX_IONODES];
+  size_t num_devs = CRAS_MAX_IODEVS, num_nodes = CRAS_MAX_IONODES;
+
+  int rc =
+      cras_client_get_input_devices(client, devs, nodes, &num_devs, &num_nodes);
+  if (rc < 0) {
+    LOG(ERROR) << "Failed to get devices: " << std::strerror(rc);
+    return false;
+  }
+
+  for (size_t i = 0; i < num_nodes; i++) {
+    if (std::string(nodes[i].type) == kKeyBoardMic)
+      return true;
+  }
+  return false;
+}
+
 int CrasGetAecSupported() {
   cras_client* client = CrasConnect();
   if (!client)

media/audio/cras/cras_util.h

@@ -31,6 +31,9 @@ struct CrasDevice {
 // Enumerates all devices of |type|.
 std::vector<CrasDevice> CrasGetAudioDevices(DeviceType type);
 
+// Returns if there is a keyboard mic in CRAS.
+bool CrasHasKeyboardMic();
+
 // Returns if system AEC is supported in CRAS.
 int CrasGetAecSupported();