Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/codecs/tools/audio_codec_speed_test.cc

 /*
  *  Copyright (c) 2014 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 16 matching lines @@
       input_length_sample_(
           static_cast<size_t>(block_duration_ms_ * input_sampling_khz_)),
       output_length_sample_(
           static_cast<size_t>(block_duration_ms_ * output_sampling_khz_)),
       data_pointer_(0),
       loop_length_samples_(0),
       max_bytes_(0),
       encoded_bytes_(0),
       encoding_time_ms_(0.0),
       decoding_time_ms_(0.0),
-      out_file_(NULL) {
-}
+      out_file_(nullptr) {}
 
 void AudioCodecSpeedTest::SetUp() {
   channels_ = get<0>(GetParam());
   bit_rate_ = get<1>(GetParam());
   in_filename_ = test::ResourcePath(get<2>(GetParam()), get<3>(GetParam()));
   save_out_data_ = get<4>(GetParam());
 
   FILE* fp = fopen(in_filename_.c_str(), "rb");
-  assert(fp != NULL);
+  assert(fp != nullptr);
 
   // Obtain file size.
   fseek(fp, 0, SEEK_END);
   loop_length_samples_ = ftell(fp) / sizeof(int16_t);
   rewind(fp);
 
   // Allocate memory to contain the whole file.
   in_data_.reset(new int16_t[loop_length_samples_ +
       input_length_sample_ * channels_]);
 
@@ skipping 19 matching lines @@
         ::testing::UnitTest::GetInstance()->current_test_info()->name();
 
     // Erase '/'
     size_t found;
     while ((found = out_filename.find('/')) != std::string::npos)
       out_filename.replace(found, 1, "_");
 
     out_filename = test::OutputPath() + out_filename + ".pcm";
 
     out_file_ = fopen(out_filename.c_str(), "wb");
-    assert(out_file_ != NULL);
+    assert(out_file_ != nullptr);
 
     printf("Output to be saved in %s.\n", out_filename.c_str());
   }
 }
 
 void AudioCodecSpeedTest::TearDown() {
   if (save_out_data_) {
     fclose(out_file_);
   }
 }
@@ skipping 20 matching lines @@
         loop_length_samples_;
     time_now_ms += block_duration_ms_;
   }
 
   printf("Encoding: %.2f%% real time,\nDecoding: %.2f%% real time.\n",
          (encoding_time_ms_ / audio_duration_sec) / 10.0,
          (decoding_time_ms_ / audio_duration_sec) / 10.0);
 }
 
 }  // namespace webrtc