Replace NULL with nullptr in all C++ files.

webrtc/tools/converter/converter.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 <stdio.h>
@@ skipping 20 matching lines @@
     : width_(width),
       height_(height) {
 }
 
 bool Converter::ConvertRGBAToI420Video(std::string frames_dir,
                                        std::string output_file_name,
                                        bool delete_frames) {
   FILE* output_file = fopen(output_file_name.c_str(), "wb");
 
   // Open output file in append mode.
-  if (output_file == NULL) {
+  if (output_file == nullptr) {
     fprintf(stderr, "Couldn't open input file for reading: %s\n",
             output_file_name.c_str());
     return false;
   }
 
   int input_frame_size = InputFrameSize();
   uint8_t* rgba_buffer = new uint8_t[input_frame_size];
   int y_plane_size = YPlaneSize();
   uint8_t* dst_y = new uint8_t[y_plane_size];
   int u_plane_size = UPlaneSize();
@@ skipping 76 matching lines @@
     fprintf(stderr, "Number of bytes written (%d) doesn't match size of y plane"
             " (%d)\n", static_cast<int>(bytes_written), yuv_plane_size);
     return false;
   }
   return true;
 }
 
 bool Converter::ReadRGBAFrame(const char* input_file_name, int input_frame_size,
                               unsigned char* buffer) {
   FILE* input_file = fopen(input_file_name, "rb");
-  if (input_file == NULL) {
+  if (input_file == nullptr) {
     fprintf(stderr, "Couldn't open input file for reading: %s\n",
             input_file_name);
     return false;
   }
 
   size_t nbr_read = fread(buffer, 1, input_frame_size, input_file);
   fclose(input_file);
 
   if (nbr_read != static_cast<size_t>(input_frame_size)) {
     fprintf(stderr, "Error reading from input file: %s\n", input_file_name);
@@ skipping 18 matching lines @@
   std::stringstream tmp;
 
   // Zero-pad number to a string.
   tmp << std::setfill('0') << std::setw(width) << number;
 
   return "frame_" + tmp.str();
 }
 
 }  // namespace test
 }  // namespace webrtc