Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_device/linux/audio_mixer_manager_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.
  */
 
 #include <assert.h>
 
 #include "webrtc/modules/audio_device/linux/audio_mixer_manager_alsa_linux.h"
 #include "webrtc/system_wrappers/include/trace.h"
 
 extern webrtc_adm_linux_alsa::AlsaSymbolTable AlsaSymbolTable;
 
 // Accesses ALSA functions through our late-binding symbol table instead of
 // directly. This way we don't have to link to libalsa, which means our binary
 // will work on systems that don't have it.
 #define LATE(sym) \
   LATESYM_GET(webrtc_adm_linux_alsa::AlsaSymbolTable, &AlsaSymbolTable, sym)
 
 namespace webrtc
 {
 
-AudioMixerManagerLinuxALSA::AudioMixerManagerLinuxALSA(const int32_t id) :
-    _critSect(*CriticalSectionWrapper::CreateCriticalSection()),
-    _id(id),
-    _outputMixerHandle(NULL),
-    _inputMixerHandle(NULL),
-    _outputMixerElement(NULL),
-    _inputMixerElement(NULL)
-{
-    WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, _id,
-                 "%s constructed", __FUNCTION__);
+AudioMixerManagerLinuxALSA::AudioMixerManagerLinuxALSA(const int32_t id)
+    : _critSect(*CriticalSectionWrapper::CreateCriticalSection()),
+      _id(id),
+      _outputMixerHandle(nullptr),
+      _inputMixerHandle(nullptr),
+      _outputMixerElement(nullptr),
+      _inputMixerElement(nullptr) {
+  WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, _id, "%s constructed",
+               __FUNCTION__);
 
-    memset(_outputMixerStr, 0, kAdmMaxDeviceNameSize);
-    memset(_inputMixerStr, 0, kAdmMaxDeviceNameSize);
+  memset(_outputMixerStr, 0, kAdmMaxDeviceNameSize);
+  memset(_inputMixerStr, 0, kAdmMaxDeviceNameSize);
 }
 
 AudioMixerManagerLinuxALSA::~AudioMixerManagerLinuxALSA()
 {
     WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, _id,
                  "%s destructed", __FUNCTION__);
 
     Close();
 
     delete &_critSect;
@@ skipping 19 matching lines @@
 
 int32_t AudioMixerManagerLinuxALSA::CloseSpeaker()
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "%s",
                  __FUNCTION__);
 
     CriticalSectionScoped lock(&_critSect);
 
     int errVal = 0;
 
-    if (_outputMixerHandle != NULL)
-    {
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing playout mixer");
-        LATE(snd_mixer_free)(_outputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error freeing playout mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        errVal = LATE(snd_mixer_detach)(_outputMixerHandle, _outputMixerStr);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error detachinging playout mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        errVal = LATE(snd_mixer_close)(_outputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error snd_mixer_close(handleMixer) errVal=%d",
-                         errVal);
-        }
-        _outputMixerHandle = NULL;
-        _outputMixerElement = NULL;
+    if (_outputMixerHandle != nullptr) {
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "Closing playout mixer");
+      LATE(snd_mixer_free)(_outputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error freeing playout mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      errVal = LATE(snd_mixer_detach)(_outputMixerHandle, _outputMixerStr);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error detachinging playout mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      errVal = LATE(snd_mixer_close)(_outputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error snd_mixer_close(handleMixer) errVal=%d",
+                     errVal);
+      }
+      _outputMixerHandle = nullptr;
+      _outputMixerElement = nullptr;
     }
     memset(_outputMixerStr, 0, kAdmMaxDeviceNameSize);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::CloseMicrophone()
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "%s", __FUNCTION__);
 
     CriticalSectionScoped lock(&_critSect);
 
     int errVal = 0;
 
-    if (_inputMixerHandle != NULL)
-    {
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer");
+    if (_inputMixerHandle != nullptr) {
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "Closing record mixer");
 
-        LATE(snd_mixer_free)(_inputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error freeing record mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer 2");
+      LATE(snd_mixer_free)(_inputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error freeing record mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                   "Closing record mixer 2");
 
-        errVal = LATE(snd_mixer_detach)(_inputMixerHandle, _inputMixerStr);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error detachinging record mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer 3");
+      errVal = LATE(snd_mixer_detach)(_inputMixerHandle, _inputMixerStr);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error detachinging record mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                   "Closing record mixer 3");
 
-        errVal = LATE(snd_mixer_close)(_inputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error snd_mixer_close(handleMixer) errVal=%d",
-                         errVal);
-        }
+      errVal = LATE(snd_mixer_close)(_inputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error snd_mixer_close(handleMixer) errVal=%d",
+                     errVal);
+      }
 
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer 4");
-        _inputMixerHandle = NULL;
-        _inputMixerElement = NULL;
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                   "Closing record mixer 4");
+      _inputMixerHandle = nullptr;
+      _inputMixerElement = nullptr;
     }
     memset(_inputMixerStr, 0, kAdmMaxDeviceNameSize);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::OpenSpeaker(char* deviceName)
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "AudioMixerManagerLinuxALSA::OpenSpeaker(name=%s)", deviceName);
 
     CriticalSectionScoped lock(&_critSect);
 
     int errVal = 0;
 
     // Close any existing output mixer handle
     //
-    if (_outputMixerHandle != NULL)
-    {
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing playout mixer");
+    if (_outputMixerHandle != nullptr) {
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "Closing playout mixer");
 
-        LATE(snd_mixer_free)(_outputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error freeing playout mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        errVal = LATE(snd_mixer_detach)(_outputMixerHandle, _outputMixerStr);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error detachinging playout mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        errVal = LATE(snd_mixer_close)(_outputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error snd_mixer_close(handleMixer) errVal=%d",
-                         errVal);
-        }
+      LATE(snd_mixer_free)(_outputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error freeing playout mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      errVal = LATE(snd_mixer_detach)(_outputMixerHandle, _outputMixerStr);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error detachinging playout mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      errVal = LATE(snd_mixer_close)(_outputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error snd_mixer_close(handleMixer) errVal=%d",
+                     errVal);
+      }
     }
-    _outputMixerHandle = NULL;
-    _outputMixerElement = NULL;
+    _outputMixerHandle = nullptr;
+    _outputMixerElement = nullptr;
 
     errVal = LATE(snd_mixer_open)(&_outputMixerHandle, 0);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "snd_mixer_open(&_outputMixerHandle, 0) - error");
         return -1;
     }
 
     char controlName[kAdmMaxDeviceNameSize] = { 0 };
     GetControlName(controlName, deviceName);
 
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "     snd_mixer_attach(_outputMixerHandle, %s)", controlName);
 
     errVal = LATE(snd_mixer_attach)(_outputMixerHandle, controlName);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     snd_mixer_attach(_outputMixerHandle, %s) error: %s",
                      controlName, LATE(snd_strerror)(errVal));
-        _outputMixerHandle = NULL;
+        _outputMixerHandle = nullptr;
         return -1;
     }
     strcpy(_outputMixerStr, controlName);
 
-    errVal = LATE(snd_mixer_selem_register)(_outputMixerHandle, NULL, NULL);
+    errVal =
+        LATE(snd_mixer_selem_register)(_outputMixerHandle, nullptr, nullptr);
     if (errVal < 0)
     {
-        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                     "     snd_mixer_selem_register(_outputMixerHandle,"
-                     " NULL, NULL), error: %s",
-                     LATE(snd_strerror)(errVal));
-        _outputMixerHandle = NULL;
-        return -1;
+      WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                   "     snd_mixer_selem_register(_outputMixerHandle,"
+                   " null, null), error: %s",
+                   LATE(snd_strerror)(errVal));
+      _outputMixerHandle = nullptr;
+      return -1;
     }
 
     // Load and find the proper mixer element
     if (LoadSpeakerMixerElement() < 0)
     {
         return -1;
     }
 
-    if (_outputMixerHandle != NULL)
-    {
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "  the output mixer device is now open (0x%x)",
-                     _outputMixerHandle);
+    if (_outputMixerHandle != nullptr) {
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                   "  the output mixer device is now open (0x%x)",
+                   _outputMixerHandle);
     }
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::OpenMicrophone(char *deviceName)
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "AudioMixerManagerLinuxALSA::OpenMicrophone(name=%s)",
                  deviceName);
 
     CriticalSectionScoped lock(&_critSect);
 
     int errVal = 0;
 
     // Close any existing input mixer handle
     //
-    if (_inputMixerHandle != NULL)
-    {
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer");
+    if (_inputMixerHandle != nullptr) {
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "Closing record mixer");
 
-        LATE(snd_mixer_free)(_inputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error freeing record mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer");
+      LATE(snd_mixer_free)(_inputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error freeing record mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "Closing record mixer");
 
-        errVal = LATE(snd_mixer_detach)(_inputMixerHandle, _inputMixerStr);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error detachinging record mixer: %s",
-                         LATE(snd_strerror)(errVal));
-        }
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer");
+      errVal = LATE(snd_mixer_detach)(_inputMixerHandle, _inputMixerStr);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error detachinging record mixer: %s",
+                     LATE(snd_strerror)(errVal));
+      }
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "Closing record mixer");
 
-        errVal = LATE(snd_mixer_close)(_inputMixerHandle);
-        if (errVal < 0)
-        {
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "     Error snd_mixer_close(handleMixer) errVal=%d",
-                         errVal);
-        }
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "Closing record mixer");
+      errVal = LATE(snd_mixer_close)(_inputMixerHandle);
+      if (errVal < 0) {
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "     Error snd_mixer_close(handleMixer) errVal=%d",
+                     errVal);
+      }
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "Closing record mixer");
     }
-    _inputMixerHandle = NULL;
-    _inputMixerElement = NULL;
+    _inputMixerHandle = nullptr;
+    _inputMixerElement = nullptr;
 
     errVal = LATE(snd_mixer_open)(&_inputMixerHandle, 0);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     snd_mixer_open(&_inputMixerHandle, 0) - error");
         return -1;
     }
 
     char controlName[kAdmMaxDeviceNameSize] = { 0 };
     GetControlName(controlName, deviceName);
 
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "     snd_mixer_attach(_inputMixerHandle, %s)", controlName);
 
     errVal = LATE(snd_mixer_attach)(_inputMixerHandle, controlName);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     snd_mixer_attach(_inputMixerHandle, %s) error: %s",
                      controlName, LATE(snd_strerror)(errVal));
 
-        _inputMixerHandle = NULL;
+        _inputMixerHandle = nullptr;
         return -1;
     }
     strcpy(_inputMixerStr, controlName);
 
-    errVal = LATE(snd_mixer_selem_register)(_inputMixerHandle, NULL, NULL);
+    errVal =
+        LATE(snd_mixer_selem_register)(_inputMixerHandle, nullptr, nullptr);
     if (errVal < 0)
     {
-        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                     "     snd_mixer_selem_register(_inputMixerHandle,"
-                     " NULL, NULL), error: %s",
-                     LATE(snd_strerror)(errVal));
+      WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                   "     snd_mixer_selem_register(_inputMixerHandle,"
+                   " null, null), error: %s",
+                   LATE(snd_strerror)(errVal));
 
-        _inputMixerHandle = NULL;
-        return -1;
+      _inputMixerHandle = nullptr;
+      return -1;
     }
     // Load and find the proper mixer element
     if (LoadMicMixerElement() < 0)
     {
         return -1;
     }
 
-    if (_inputMixerHandle != NULL)
-    {
-        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                     "  the input mixer device is now open (0x%x)",
-                     _inputMixerHandle);
+    if (_inputMixerHandle != nullptr) {
+      WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                   "  the input mixer device is now open (0x%x)",
+                   _inputMixerHandle);
     }
 
     return 0;
 }
 
 bool AudioMixerManagerLinuxALSA::SpeakerIsInitialized() const
 {
     WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, _id, "%s", __FUNCTION__);
 
-    return (_outputMixerHandle != NULL);
+    return (_outputMixerHandle != nullptr);
 }
 
 bool AudioMixerManagerLinuxALSA::MicrophoneIsInitialized() const
 {
     WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, _id, "%s",
                  __FUNCTION__);
 
-    return (_inputMixerHandle != NULL);
+    return (_inputMixerHandle != nullptr);
 }
 
 int32_t AudioMixerManagerLinuxALSA::SetSpeakerVolume(
     uint32_t volume)
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "AudioMixerManagerLinuxALSA::SetSpeakerVolume(volume=%u)",
                  volume);
 
     CriticalSectionScoped lock(&_critSect);
 
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer element exists");
-        return -1;
+    if (_outputMixerElement == nullptr) {
+      WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                   "  no avaliable output mixer element exists");
+      return -1;
     }
 
     int errVal =
         LATE(snd_mixer_selem_set_playback_volume_all)(_outputMixerElement,
                                                       volume);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     Error changing master volume: %s",
                      LATE(snd_strerror)(errVal));
         return -1;
     }
 
     return (0);
 }
 
 int32_t AudioMixerManagerLinuxALSA::SpeakerVolume(
     uint32_t& volume) const
 {
-
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer element exists");
-        return -1;
+  if (_outputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable output mixer element exists");
+    return -1;
     }
 
     long int vol(0);
 
     int
         errVal = LATE(snd_mixer_selem_get_playback_volume)(
             _outputMixerElement,
             (snd_mixer_selem_channel_id_t) 0,
             &vol);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "Error getting outputvolume: %s",
                      LATE(snd_strerror)(errVal));
         return -1;
     }
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "     AudioMixerManagerLinuxALSA::SpeakerVolume() => vol=%i",
                  vol);
 
     volume = static_cast<uint32_t> (vol);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MaxSpeakerVolume(
     uint32_t& maxVolume) const
 {
-
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avilable output mixer element exists");
-        return -1;
+  if (_outputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avilable output mixer element exists");
+    return -1;
     }
 
     long int minVol(0);
     long int maxVol(0);
 
     int errVal =
         LATE(snd_mixer_selem_get_playback_volume_range)(_outputMixerElement,
                                                         &minVol, &maxVol);
 
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "     Playout hardware volume range, min: %d, max: %d",
                  minVol, maxVol);
 
     if (maxVol <= minVol)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     Error getting get_playback_volume_range: %s",
                      LATE(snd_strerror)(errVal));
     }
 
     maxVolume = static_cast<uint32_t> (maxVol);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MinSpeakerVolume(
     uint32_t& minVolume) const
 {
-
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer element exists");
-        return -1;
+  if (_outputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable output mixer element exists");
+    return -1;
     }
 
     long int minVol(0);
     long int maxVol(0);
 
     int errVal =
         LATE(snd_mixer_selem_get_playback_volume_range)(_outputMixerElement,
                                                         &minVol, &maxVol);
 
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
@@ skipping 16 matching lines @@
 // they were therefore not added
 /*
  // ----------------------------------------------------------------------------
  //    SetMaxSpeakerVolume
  // ----------------------------------------------------------------------------
 
  int32_t AudioMixerManagerLinuxALSA::SetMaxSpeakerVolume(
      uint32_t maxVolume)
  {
 
- if (_outputMixerElement == NULL)
+ if (_outputMixerElement == nullptr)
  {
  WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
  "  no avaliable output mixer element exists");
  return -1;
  }
 
  long int minVol(0);
  long int maxVol(0);
 
  int errVal = snd_mixer_selem_get_playback_volume_range(
@@ skipping 20 matching lines @@
  }
 
  // ----------------------------------------------------------------------------
  //    SetMinSpeakerVolume
  // ----------------------------------------------------------------------------
 
  int32_t AudioMixerManagerLinuxALSA::SetMinSpeakerVolume(
      uint32_t minVolume)
  {
 
- if (_outputMixerElement == NULL)
+ if (_outputMixerElement == nullptr)
  {
  WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
  "  no avaliable output mixer element exists");
  return -1;
  }
 
  long int minVol(0);
  long int maxVol(0);
 
  int errVal = snd_mixer_selem_get_playback_volume_range(
@@ skipping 16 matching lines @@
  return -1;
  }
 
  return 0;
  }
  */
 
 int32_t AudioMixerManagerLinuxALSA::SpeakerVolumeStepSize(
     uint16_t& stepSize) const
 {
-
-    if (_outputMixerHandle == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer exists");
-        return -1;
+  if (_outputMixerHandle == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable output mixer exists");
+    return -1;
     }
 
     // The step size is always 1 for ALSA
     stepSize = 1;
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::SpeakerVolumeIsAvailable(
     bool& available)
 {
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer element exists");
-        return -1;
+  if (_outputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable output mixer element exists");
+    return -1;
     }
 
     available = LATE(snd_mixer_selem_has_playback_volume)(_outputMixerElement);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::SpeakerMuteIsAvailable(
     bool& available)
 {
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer element exists");
-        return -1;
+  if (_outputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable output mixer element exists");
+    return -1;
     }
 
     available = LATE(snd_mixer_selem_has_playback_switch)(_outputMixerElement);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::SetSpeakerMute(bool enable)
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "AudioMixerManagerLinuxALSA::SetSpeakerMute(enable=%u)",
                  enable);
 
     CriticalSectionScoped lock(&_critSect);
 
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer element exists");
-        return -1;
+    if (_outputMixerElement == nullptr) {
+      WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                   "  no avaliable output mixer element exists");
+      return -1;
     }
 
     // Ensure that the selected speaker destination has a valid mute control.
     bool available(false);
     SpeakerMuteIsAvailable(available);
     if (!available)
     {
         WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
                      "  it is not possible to mute the speaker");
         return -1;
     }
 
     // Note value = 0 (off) means muted
     int errVal =
         LATE(snd_mixer_selem_set_playback_switch_all)(_outputMixerElement,
                                                       !enable);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     Error setting playback switch: %s",
                      LATE(snd_strerror)(errVal));
         return -1;
     }
 
     return (0);
 }
 
 int32_t AudioMixerManagerLinuxALSA::SpeakerMute(bool& enabled) const
 {
-
-    if (_outputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable output mixer exists");
-        return -1;
+  if (_outputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable output mixer exists");
+    return -1;
     }
 
     // Ensure that the selected speaker destination has a valid mute control.
     bool available =
         LATE(snd_mixer_selem_has_playback_switch)(_outputMixerElement);
     if (!available)
     {
         WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
                      "  it is not possible to mute the speaker");
         return -1;
@@ skipping 18 matching lines @@
 
     // Note value = 0 (off) means muted
     enabled = (bool) !value;
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MicrophoneMuteIsAvailable(
     bool& available)
 {
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer element exists");
-        return -1;
+  if (_inputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer element exists");
+    return -1;
     }
 
     available = LATE(snd_mixer_selem_has_capture_switch)(_inputMixerElement);
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::SetMicrophoneMute(bool enable)
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "AudioMixerManagerLinuxALSA::SetMicrophoneMute(enable=%u)",
                  enable);
 
     CriticalSectionScoped lock(&_critSect);
 
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer element exists");
-        return -1;
+    if (_inputMixerElement == nullptr) {
+      WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                   "  no avaliable input mixer element exists");
+      return -1;
     }
 
     // Ensure that the selected microphone destination has a valid mute control.
     bool available(false);
     MicrophoneMuteIsAvailable(available);
     if (!available)
     {
         WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
                      "  it is not possible to mute the microphone");
         return -1;
     }
 
     // Note value = 0 (off) means muted
     int errVal =
         LATE(snd_mixer_selem_set_capture_switch_all)(_inputMixerElement,
                                                      !enable);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     Error setting capture switch: %s",
                      LATE(snd_strerror)(errVal));
         return -1;
     }
 
     return (0);
 }
 
 int32_t AudioMixerManagerLinuxALSA::MicrophoneMute(bool& enabled) const
 {
-
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer exists");
-        return -1;
+  if (_inputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer exists");
+    return -1;
     }
 
     // Ensure that the selected microphone destination has a valid mute control.
     bool available =
         LATE(snd_mixer_selem_has_capture_switch)(_inputMixerElement);
     if (!available)
     {
         WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
                      "  it is not possible to mute the microphone");
         return -1;
@@ skipping 18 matching lines @@
 
     // Note value = 0 (off) means muted
     enabled = (bool) !value;
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MicrophoneBoostIsAvailable(
     bool& available)
 {
-    if (_inputMixerHandle == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer exists");
-        return -1;
+  if (_inputMixerHandle == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer exists");
+    return -1;
     }
 
     // Microphone boost cannot be enabled through ALSA Simple Mixer Interface
     available = false;
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::SetMicrophoneBoost(bool enable)
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "AudioMixerManagerLinuxALSA::SetMicrophoneBoost(enable=%u)",
                  enable);
 
     CriticalSectionScoped lock(&_critSect);
 
-    if (_inputMixerHandle == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer exists");
-        return -1;
+    if (_inputMixerHandle == nullptr) {
+      WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                   "  no avaliable input mixer exists");
+      return -1;
     }
 
     // Ensure that the selected microphone destination has a valid mute control.
     bool available(false);
     MicrophoneMuteIsAvailable(available);
     if (!available)
     {
         WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
                      "  it is not possible to enable microphone boost");
         return -1;
     }
 
     // It is assumed that the call above fails!
 
     return (0);
 }
 
 int32_t AudioMixerManagerLinuxALSA::MicrophoneBoost(bool& enabled) const
 {
-
-    if (_inputMixerHandle == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer exists");
-        return -1;
+  if (_inputMixerHandle == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer exists");
+    return -1;
     }
 
     // Microphone boost cannot be enabled on this platform!
     enabled = false;
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MicrophoneVolumeIsAvailable(
     bool& available)
 {
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer element exists");
-        return -1;
+  if (_inputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer element exists");
+    return -1;
     }
 
     available = LATE(snd_mixer_selem_has_capture_volume)(_inputMixerElement);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::SetMicrophoneVolume(
     uint32_t volume)
 {
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "AudioMixerManagerLinuxALSA::SetMicrophoneVolume(volume=%u)",
                  volume);
 
     CriticalSectionScoped lock(&_critSect);
 
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer element exists");
-        return -1;
+    if (_inputMixerElement == nullptr) {
+      WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                   "  no avaliable input mixer element exists");
+      return -1;
     }
 
     int
         errVal =
             LATE(snd_mixer_selem_set_capture_volume_all)(_inputMixerElement,
                                                          volume);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     Error changing microphone volume: %s",
                      LATE(snd_strerror)(errVal));
         return -1;
     }
 
     return (0);
 }
 
 // TL: Have done testnig with these but they don't seem reliable and
 // they were therefore not added
 /*
  // ----------------------------------------------------------------------------
  //    SetMaxMicrophoneVolume
  // ----------------------------------------------------------------------------
 
  int32_t AudioMixerManagerLinuxALSA::SetMaxMicrophoneVolume(
      uint32_t maxVolume)
  {
 
- if (_inputMixerElement == NULL)
+ if (_inputMixerElement == nullptr)
  {
  WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
   "  no avaliable output mixer element exists");
  return -1;
  }
 
  long int minVol(0);
  long int maxVol(0);
 
  int errVal = snd_mixer_selem_get_capture_volume_range(_inputMixerElement,
   &minVol, &maxVol);
  if ((maxVol <= minVol) || (errVal != 0))
  {
  WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
   "     Error getting capture volume range: %s", snd_strerror(errVal));
  }
 
  maxVol = (long int)maxVolume;
  printf("min %d max %d", minVol, maxVol);
- errVal = snd_mixer_selem_set_capture_volume_range(_inputMixerElement, minVol, maxVol);
+ errVal = snd_mixer_selem_set_capture_volume_range(_inputMixerElement, minVol,
+ maxVol);
  WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
  "     Capture hardware volume range, min: %d, max: %d", minVol, maxVol);
  if (errVal != 0)
  {
  WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
   "     Error setting capture volume range: %s", snd_strerror(errVal));
  return -1;
  }
 
  return 0;
  }
 
  // ----------------------------------------------------------------------------
  //    SetMinMicrophoneVolume
  // ----------------------------------------------------------------------------
 
  int32_t AudioMixerManagerLinuxALSA::SetMinMicrophoneVolume(
  uint32_t minVolume)
  {
 
- if (_inputMixerElement == NULL)
+ if (_inputMixerElement == nullptr)
  {
  WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
   "  no avaliable output mixer element exists");
  return -1;
  }
 
  long int minVol(0);
  long int maxVol(0);
 
  int errVal = snd_mixer_selem_get_capture_volume_range(
@@ skipping 18 matching lines @@
  return -1;
  }
 
  return 0;
  }
  */
 
 int32_t AudioMixerManagerLinuxALSA::MicrophoneVolume(
     uint32_t& volume) const
 {
-
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer element exists");
-        return -1;
+  if (_inputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer element exists");
+    return -1;
     }
 
     long int vol(0);
 
     int
         errVal =
             LATE(snd_mixer_selem_get_capture_volume)(
                 _inputMixerElement,
                 (snd_mixer_selem_channel_id_t) 0,
                 &vol);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "Error getting inputvolume: %s",
                      LATE(snd_strerror)(errVal));
         return -1;
     }
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "     AudioMixerManagerLinuxALSA::MicrophoneVolume() => vol=%i",
                  vol);
 
     volume = static_cast<uint32_t> (vol);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MaxMicrophoneVolume(
     uint32_t& maxVolume) const
 {
-
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer element exists");
-        return -1;
+  if (_inputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer element exists");
+    return -1;
     }
 
     long int minVol(0);
     long int maxVol(0);
 
     // check if we have mic volume at all
     if (!LATE(snd_mixer_selem_has_capture_volume)(_inputMixerElement))
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     No microphone volume available");
@@ skipping 15 matching lines @@
     }
 
     maxVolume = static_cast<uint32_t> (maxVol);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MinMicrophoneVolume(
     uint32_t& minVolume) const
 {
-
-    if (_inputMixerElement == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer element exists");
-        return -1;
+  if (_inputMixerElement == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer element exists");
+    return -1;
     }
 
     long int minVol(0);
     long int maxVol(0);
 
     int errVal =
         LATE(snd_mixer_selem_get_capture_volume_range)(_inputMixerElement,
                                                        &minVol, &maxVol);
 
     WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                  "     Microphone hardware volume range, min: %d, max: %d",
                  minVol, maxVol);
     if (maxVol <= minVol)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     Error getting microphone volume range: %s",
                      LATE(snd_strerror)(errVal));
     }
 
     minVolume = static_cast<uint32_t> (minVol);
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::MicrophoneVolumeStepSize(
     uint16_t& stepSize) const
 {
-
-    if (_inputMixerHandle == NULL)
-    {
-        WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
-                     "  no avaliable input mixer exists");
-        return -1;
+  if (_inputMixerHandle == nullptr) {
+    WEBRTC_TRACE(kTraceWarning, kTraceAudioDevice, _id,
+                 "  no avaliable input mixer exists");
+    return -1;
     }
 
     // The step size is always 1 for ALSA
     stepSize = 1;
 
     return 0;
 }
 
 // ============================================================================
 //                                 Private Methods
 // ============================================================================
 
 int32_t AudioMixerManagerLinuxALSA::LoadMicMixerElement() const
 {
     int errVal = LATE(snd_mixer_load)(_inputMixerHandle);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "snd_mixer_load(_inputMixerHandle), error: %s",
                      LATE(snd_strerror)(errVal));
-        _inputMixerHandle = NULL;
+        _inputMixerHandle = nullptr;
         return -1;
     }
 
-    snd_mixer_elem_t *elem = NULL;
-    snd_mixer_elem_t *micElem = NULL;
+    snd_mixer_elem_t* elem = nullptr;
+    snd_mixer_elem_t* micElem = nullptr;
     unsigned mixerIdx = 0;
-    const char *selemName = NULL;
+    const char* selemName = nullptr;
 
     // Find and store handles to the right mixer elements
     for (elem = LATE(snd_mixer_first_elem)(_inputMixerHandle); elem; elem
         = LATE(snd_mixer_elem_next)(elem), mixerIdx++)
     {
         if (LATE(snd_mixer_selem_is_active)(elem))
         {
             selemName = LATE(snd_mixer_selem_get_name)(elem);
             if (strcmp(selemName, "Capture") == 0) // "Capture", "Mic"
             {
                 _inputMixerElement = elem;
                 WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice,
                              _id, "     Capture element set");
             } else if (strcmp(selemName, "Mic") == 0)
             {
                 micElem = elem;
                 WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice,
                              _id, "     Mic element found");
             }
         }
 
         if (_inputMixerElement)
         {
             // Use the first Capture element that is found
             // The second one may not work
             break;
         }
     }
 
-    if (_inputMixerElement == NULL)
-    {
-        // We didn't find a Capture handle, use Mic.
-        if (micElem != NULL)
-        {
-            _inputMixerElement = micElem;
-            WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                         "     Using Mic as capture volume.");
-        } else
-        {
-            _inputMixerElement = NULL;
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "Could not find capture volume on the mixer.");
+    if (_inputMixerElement == nullptr) {
+      // We didn't find a Capture handle, use Mic.
+      if (micElem != nullptr) {
+        _inputMixerElement = micElem;
+        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                     "     Using Mic as capture volume.");
+      } else {
+        _inputMixerElement = nullptr;
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "Could not find capture volume on the mixer.");
 
-            return -1;
-        }
+        return -1;
+      }
     }
 
     return 0;
 }
 
 int32_t AudioMixerManagerLinuxALSA::LoadSpeakerMixerElement() const
 {
     int errVal = LATE(snd_mixer_load)(_outputMixerHandle);
     if (errVal < 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
                      "     snd_mixer_load(_outputMixerHandle), error: %s",
                      LATE(snd_strerror)(errVal));
-        _outputMixerHandle = NULL;
+        _outputMixerHandle = nullptr;
         return -1;
     }
 
-    snd_mixer_elem_t *elem = NULL;
-    snd_mixer_elem_t *masterElem = NULL;
-    snd_mixer_elem_t *speakerElem = NULL;
+    snd_mixer_elem_t* elem = nullptr;
+    snd_mixer_elem_t* masterElem = nullptr;
+    snd_mixer_elem_t* speakerElem = nullptr;
     unsigned mixerIdx = 0;
-    const char *selemName = NULL;
+    const char* selemName = nullptr;
 
     // Find and store handles to the right mixer elements
     for (elem = LATE(snd_mixer_first_elem)(_outputMixerHandle); elem; elem
         = LATE(snd_mixer_elem_next)(elem), mixerIdx++)
     {
         if (LATE(snd_mixer_selem_is_active)(elem))
         {
             selemName = LATE(snd_mixer_selem_get_name)(elem);
             WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
                          "snd_mixer_selem_get_name %d: %s =%x", mixerIdx,
@@ skipping 19 matching lines @@
         }
 
         if (_outputMixerElement)
         {
             // We have found the element we want
             break;
         }
     }
 
     // If we didn't find a PCM Handle, use Master or Speaker
-    if (_outputMixerElement == NULL)
-    {
-        if (masterElem != NULL)
-        {
-            _outputMixerElement = masterElem;
-            WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                         "     Using Master as output volume.");
-        } else if (speakerElem != NULL)
-        {
-            _outputMixerElement = speakerElem;
-            WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
-                         "     Using Speaker as output volume.");
-        } else
-        {
-            _outputMixerElement = NULL;
-            WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
-                         "Could not find output volume in the mixer.");
-            return -1;
-        }
+    if (_outputMixerElement == nullptr) {
+      if (masterElem != nullptr) {
+        _outputMixerElement = masterElem;
+        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                     "     Using Master as output volume.");
+      } else if (speakerElem != nullptr) {
+        _outputMixerElement = speakerElem;
+        WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id,
+                     "     Using Speaker as output volume.");
+      } else {
+        _outputMixerElement = nullptr;
+        WEBRTC_TRACE(kTraceError, kTraceAudioDevice, _id,
+                     "Could not find output volume in the mixer.");
+        return -1;
+      }
     }
 
     return 0;
 }
 
 void AudioMixerManagerLinuxALSA::GetControlName(char* controlName,
                                                 char* deviceName) const
 {
     // Example
     // deviceName: "front:CARD=Intel,DEV=0"
@@ skipping 12 matching lines @@
         strncpy(&controlName[2], pos1, nChar);
         controlName[2 + nChar] = '\0';
     } else
     {
         strcpy(controlName, deviceName);
     }
 
 }
 
 }