UMA log for audio_device Init and Start(Playout|Recording). Make Init return a more specific error …

webrtc/modules/audio_device/linux/audio_device_alsa_linux.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 137 matching lines @@
     _ptrAudioBuffer->SetPlayoutChannels(0);
 }
 
 int32_t AudioDeviceLinuxALSA::ActiveAudioLayer(
     AudioDeviceModule::AudioLayer& audioLayer) const
 {
     audioLayer = AudioDeviceModule::kLinuxAlsaAudio;
     return 0;
 }
 
-int32_t AudioDeviceLinuxALSA::Init()
-{
+AudioDeviceGeneric::InitStatus AudioDeviceLinuxALSA::Init() {
+  CriticalSectionScoped lock(&_critSect);
 
-    CriticalSectionScoped lock(&_critSect);
+  // Load libasound
+  if (!AlsaSymbolTable.Load()) {
+    // Alsa is not installed on
+    // this system
+    WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                 "  failed to load symbol table");
+    return InitStatus::kOtherError;
+  }
 
-    // Load libasound
-    if (!AlsaSymbolTable.Load())
-    {
-        // Alsa is not installed on
-        // this system
-        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                   "  failed to load symbol table");
-        return -1;
-    }
-
-    if (_initialized)
-    {
-        return 0;
-    }
+  if (_initialized) {
+    return InitStatus::kOk;
+  }
 #if defined(USE_X11)
     //Get X display handle for typing detection
     _XDisplay = XOpenDisplay(NULL);
     if (!_XDisplay)
     {
         WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
           "  failed to open X display, typing detection will not work");
     }
 #endif
     _playWarning = 0;
     _playError = 0;
     _recWarning = 0;
     _recError = 0;
 
     _initialized = true;
 
-    return 0;
+    return InitStatus::kOk;
 }
 
 int32_t AudioDeviceLinuxALSA::Terminate()
 {
     if (!_initialized)
     {
         return 0;
     }
 
     CriticalSectionScoped lock(&_critSect);
@@ skipping 2014 matching lines @@
     state |= (szKey[i] ^ _oldKeyState[i]) & szKey[i];
 
   // Save old state
   memcpy((char*)_oldKeyState, (char*)szKey, sizeof(_oldKeyState));
   return (state != 0);
 #else
   return false;
 #endif
 }
 }  // namespace webrtc