Reland of PyLint fixes for tools-webrtc and webrtc/tools

webrtc/tools/barcode_tools/yuv_cropper.py

 #!/usr/bin/env python
 # 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.
 
 import optparse
 import os
 import sys
 
 
-def _crop_one_frame(yuv_file, output_file, component_sizes):
+def _CropOneFrame(yuv_file, output_file, component_sizes):
   """Crops one frame.
 
   This function crops one frame going through all the YUV planes and cropping
   respective amount of rows.
 
   Args:
     yuv_file(file): The opened (for binary reading) YUV file.
     output_file(file): The opened (for binary writing) file.
     component_sizes(list of 3 3-ples): The list contains the sizes for all the
       planes (Y, U, V) of the YUV file plus the crop_height scaled for every
@@ skipping 11 matching lines @@
       # If the plane is empty, we have reached the end of the file.
       if yuv_plane == "":
         return False
 
       # Only write the plane data for the rows bigger than crop_height.
       if row >= comp_crop_height:
         output_file.write(yuv_plane)
   return True
 
 
-def crop_frames(yuv_file_name, output_file_name, width, height, crop_height):
+def CropFrames(yuv_file_name, output_file_name, width, height, crop_height):
   """Crops rows of pixels from the top of the YUV frames.
 
   This function goes through all the frames in a video and crops the crop_height
   top pixel rows of every frame.
 
   Args:
     yuv_file_name(string): The name of the YUV file to be cropped.
     output_file_name(string): The name of the output file where the result will
       be written.
     width(int): The width of the original YUV file.
     height(int): The height of the original YUV file.
     crop_height(int): The height (the number of pixel rows) to be cropped from
       the frames.
   """
   # Component sizes = [Y_sizes, U_sizes, V_sizes].
   component_sizes = [(width, height, crop_height),
                      (width/2, height/2, crop_height/2),
                      (width/2, height/2, crop_height/2)]
 
   yuv_file = open(yuv_file_name, 'rb')
   output_file = open(output_file_name, 'wb')
 
   data_left = True
   while data_left:
-    data_left = _crop_one_frame(yuv_file, output_file, component_sizes)
+    data_left = _CropOneFrame(yuv_file, output_file, component_sizes)
 
   yuv_file.close()
   output_file.close()
 
 
-def _parse_args():
+def _ParseArgs():
   """Registers the command-line options."""
   usage = "usage: %prog [options]"
   parser = optparse.OptionParser(usage=usage)
 
   parser.add_option('--width', type='int',
                     default=352,
                     help=('Width of the YUV file\'s frames. '
                           'Default: %default'))
   parser.add_option('--height', type='int', default=288,
                     help=('Height of the YUV file\'s frames. '
                           'Default: %default'))
   parser.add_option('--crop_height', type='int', default=32,
                     help=('How much of the top of the YUV file to crop. '
                           'Has to be module of 2. Default: %default'))
   parser.add_option('--yuv_file', type='string',
                     help=('The YUV file to be cropped.'))
   parser.add_option('--output_file', type='string', default='output.yuv',
                     help=('The output YUV file containing the cropped YUV. '
                           'Default: %default'))
   options = parser.parse_args()[0]
   if not options.yuv_file:
     parser.error('yuv_file argument missing. Please specify input YUV file!')
   return options
 
 
-def _main():
+def main():
   """A tool to crop rows of pixels from the top part of a YUV file.
 
   A simple invocation will be:
   ./yuv_cropper.py --width=640 --height=480 --crop_height=32
   --yuv_file=<path_and_name_of_yuv_file>
   --output_yuv=<path and name_of_output_file>
   """
-  options = _parse_args()
+  options = _ParseArgs()
 
   if os.path.getsize(options.yuv_file) == 0:
     sys.stderr.write('Error: The YUV file you have passed has size 0. The '
                      'produced output will also have size 0.\n')
     return -1
 
-  crop_frames(options.yuv_file, options.output_file, options.width,
-              options.height, options.crop_height)
+  CropFrames(options.yuv_file, options.output_file, options.width,
+             options.height, options.crop_height)
   return 0
 
 
 if __name__ == '__main__':
-  sys.exit(_main())
+  sys.exit(main())