Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_processing/echo_cancellation_impl.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 26 matching lines @@
   switch (err) {
     case AEC_UNSUPPORTED_FUNCTION_ERROR:
       return AudioProcessing::kUnsupportedFunctionError;
     case AEC_BAD_PARAMETER_ERROR:
       return AudioProcessing::kBadParameterError;
     case AEC_BAD_PARAMETER_WARNING:
       return AudioProcessing::kBadStreamParameterWarning;
     default:
       // AEC_UNSPECIFIED_ERROR
       // AEC_UNINITIALIZED_ERROR
-      // AEC_NULL_POINTER_ERROR
+      // AEC_null_POINTER_ERROR
       return AudioProcessing::kUnspecifiedError;
   }
 }
 
 }  // namespace
 
 struct EchoCancellationImpl::StreamProperties {
   StreamProperties() = delete;
   StreamProperties(int sample_rate_hz,
                    size_t num_reverse_channels,
@@ skipping 211 matching lines @@
 
 bool EchoCancellationImpl::are_metrics_enabled() const {
   rtc::CritScope cs(crit_capture_);
   return enabled_ && metrics_enabled_;
 }
 
 // TODO(ajm): we currently just use the metrics from the first AEC. Think more
 //            aboue the best way to extend this to multi-channel.
 int EchoCancellationImpl::GetMetrics(Metrics* metrics) {
   rtc::CritScope cs(crit_capture_);
-  if (metrics == NULL) {
+  if (metrics == nullptr) {
     return AudioProcessing::kNullPointerError;
   }
 
   if (!enabled_ || !metrics_enabled_) {
     return AudioProcessing::kNotEnabledError;
   }
 
   AecMetrics my_metrics;
   memset(&my_metrics, 0, sizeof(my_metrics));
   memset(metrics, 0, sizeof(Metrics));
@@ skipping 68 matching lines @@
 // TODO(bjornv): How should we handle the multi-channel case?
 int EchoCancellationImpl::GetDelayMetrics(int* median, int* std) {
   rtc::CritScope cs(crit_capture_);
   float fraction_poor_delays = 0;
   return GetDelayMetrics(median, std, &fraction_poor_delays);
 }
 
 int EchoCancellationImpl::GetDelayMetrics(int* median, int* std,
                                           float* fraction_poor_delays) {
   rtc::CritScope cs(crit_capture_);
-  if (median == NULL) {
+  if (median == nullptr) {
     return AudioProcessing::kNullPointerError;
   }
-  if (std == NULL) {
+  if (std == nullptr) {
     return AudioProcessing::kNullPointerError;
   }
 
   if (!enabled_ || !delay_logging_enabled_) {
     return AudioProcessing::kNotEnabledError;
   }
 
   const int err = WebRtcAec_GetDelayMetrics(cancellers_[0]->state(), median,
                                             std, fraction_poor_delays);
   if (err != AudioProcessing::kNoError) {
     return MapError(err);
   }
 
   return AudioProcessing::kNoError;
 }
 
 struct AecCore* EchoCancellationImpl::aec_core() const {
   rtc::CritScope cs(crit_capture_);
   if (!enabled_) {
-    return NULL;
+    return nullptr;
   }
   return WebRtcAec_aec_core(cancellers_[0]->state());
 }
 
 void EchoCancellationImpl::Initialize(int sample_rate_hz,
                                       size_t num_reverse_channels,
                                       size_t num_output_channels,
                                       size_t num_proc_channels) {
   rtc::CritScope cs_render(crit_render_);
   rtc::CritScope cs_capture(crit_capture_);
@@ skipping 91 matching lines @@
   return error;
 }
 
 size_t EchoCancellationImpl::NumCancellersRequired(
     size_t num_output_channels,
     size_t num_reverse_channels) {
   return num_output_channels * num_reverse_channels;
 }
 
 }  // namespace webrtc