Replace NULL with nullptr in all C++ files.

webrtc/tools/agc/activity_metric.cc

Index: webrtc/tools/agc/activity_metric.cc
diff --git a/webrtc/tools/agc/activity_metric.cc b/webrtc/tools/agc/activity_metric.cc
index a98730a3422bd1c3966f9bae0da7237a188eee7a..c0b29f043c82a84828d10cbb21000202f7ce7457 100644
--- a/webrtc/tools/agc/activity_metric.cc
+++ b/webrtc/tools/agc/activity_metric.cc
@@ -79,13 +79,13 @@ class AgcStat {
         audio_processing_(new VadAudioProc()),
         vad_(new PitchBasedVad()),
         standalone_vad_(StandaloneVad::Create()),
-        audio_content_fid_(NULL) {
+        audio_content_fid_(nullptr) {
     for (size_t n = 0; n < kMaxNumFrames; n++)
       video_vad_[n] = 0.5;
   }
 
   ~AgcStat() {
-    if (audio_content_fid_ != NULL) {
+    if (audio_content_fid_ != nullptr) {
       fclose(audio_content_fid_);
     }
   }
@@ -129,7 +129,7 @@ class AgcStat {
       for (size_t n = 0; n < features.num_frames; n++) {
         audio_content_->Update(features.rms[n], p[n]);
         double ac = audio_content_->AudioContent();
-        if (audio_content_fid_ != NULL) {
+        if (audio_content_fid_ != nullptr) {
           fwrite(&ac, sizeof(ac), 1, audio_content_fid_);
         }
         if (ac > kAgcAnalWindowSamples * activity_threshold_) {
@@ -168,20 +168,20 @@ void void_main(int argc, char* argv[]) {
   webrtc::AgcStat agc_stat;
 
   FILE* pcm_fid = fopen(argv[1], "rb");
-  ASSERT_TRUE(pcm_fid != NULL) << "Cannot open PCM file " << argv[1];
+  ASSERT_TRUE(pcm_fid != nullptr) << "Cannot open PCM file " << argv[1];
 
   if (argc < 2) {
     fprintf(stderr, "\nNot Enough arguments\n");
   }
 
-  FILE* true_vad_fid = NULL;
+  FILE* true_vad_fid = nullptr;
   ASSERT_GT(FLAGS_true_vad.size(), 0u) << "Specify the file containing true "
       "VADs using --true_vad flag.";
   true_vad_fid = fopen(FLAGS_true_vad.c_str(), "rb");
-  ASSERT_TRUE(true_vad_fid != NULL) << "Cannot open the active list " <<
-      FLAGS_true_vad;
+  ASSERT_TRUE(true_vad_fid != nullptr) << "Cannot open the active list "
+                                       << FLAGS_true_vad;
 
-  FILE* results_fid = NULL;
+  FILE* results_fid = nullptr;
   if (FLAGS_result.size() > 0) {
     // True if this is the first time writing to this function and we add a
     // header to the beginning of the file.
@@ -189,7 +189,7 @@ void void_main(int argc, char* argv[]) {
     // Open in the read mode. If it fails, the file doesn't exist and has to
     // write a header for it. Otherwise no need to write a header.
     results_fid = fopen(FLAGS_result.c_str(), "r");
-    if (results_fid == NULL) {
+    if (results_fid == nullptr) {
       write_header = true;
     } else {
       fclose(results_fid);
@@ -197,8 +197,9 @@ void void_main(int argc, char* argv[]) {
     }
     // Open in append mode.
     results_fid = fopen(FLAGS_result.c_str(), "a");
-    ASSERT_TRUE(results_fid != NULL) << "Cannot open the file, " <<
-              FLAGS_result << ", to write the results.";
+    ASSERT_TRUE(results_fid != nullptr) << "Cannot open the file, "
+                                        << FLAGS_result
+                                        << ", to write the results.";
     // Write the header if required.
     if (write_header) {
       fprintf(results_fid, "%% Total Active,  Misdetection,  "
@@ -207,20 +208,22 @@ void void_main(int argc, char* argv[]) {
     }
   }
 
-  FILE* video_vad_fid = NULL;
+  FILE* video_vad_fid = nullptr;
   if (FLAGS_video_vad.size() > 0) {
     video_vad_fid = fopen(FLAGS_video_vad.c_str(), "rb");
-    ASSERT_TRUE(video_vad_fid != NULL) <<  "Cannot open the file, " <<
-              FLAGS_video_vad << " to read video-based VAD decisions.\n";
+    ASSERT_TRUE(video_vad_fid != nullptr)
+        << "Cannot open the file, " << FLAGS_video_vad
+        << " to read video-based VAD decisions.\n";
   }
 
   // AgsStat will be the owner of this file and will close it at its
   // destructor.
-  FILE* audio_content_fid = NULL;
+  FILE* audio_content_fid = nullptr;
   if (FLAGS_audio_content.size() > 0) {
     audio_content_fid = fopen(FLAGS_audio_content.c_str(), "wb");
-    ASSERT_TRUE(audio_content_fid != NULL) << "Cannot open file, " <<
-              FLAGS_audio_content << " to write audio-content.\n";
+    ASSERT_TRUE(audio_content_fid != nullptr) << "Cannot open file, "
+                                              << FLAGS_audio_content
+                                              << " to write audio-content.\n";
     agc_stat.set_audio_content_file(audio_content_fid);
   }
 
@@ -257,7 +260,7 @@ void void_main(int argc, char* argv[]) {
     ASSERT_EQ(1u, fread(&true_vad[true_vad_index], sizeof(*true_vad), 1,
                         true_vad_fid))
         << "Size mismatch between True-VAD and the PCM file.\n";
-    if (video_vad_fid != NULL) {
+    if (video_vad_fid != nullptr) {
       ASSERT_EQ(1u, fread(&p_video, sizeof(p_video), 1, video_vad_fid)) <<
           "Not enough video-based VAD probabilities.";
     }
@@ -333,7 +336,7 @@ void void_main(int argc, char* argv[]) {
     }
   }
 
-  if (results_fid != NULL) {
+  if (results_fid != nullptr) {
     fprintf(results_fid, "%4d  %4d  %4d  %4d  %4d  %4d  %4.0f %4.0f\n",
             total_active,
             total_missed_detection,
@@ -358,10 +361,10 @@ void void_main(int argc, char* argv[]) {
 
   fclose(true_vad_fid);
   fclose(pcm_fid);
-  if (video_vad_fid != NULL) {
+  if (video_vad_fid != nullptr) {
     fclose(video_vad_fid);
   }
-  if (results_fid != NULL) {
+  if (results_fid != nullptr) {
     fclose(results_fid);
   }
 }