126 lines
4.5 KiB
Python
126 lines
4.5 KiB
Python
|
#!/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):
|
||
|
|
"""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
|
||
|
|
plane. The sizes equal width, height and crop_height for the Y plane,
|
||
|
|
and are equal to width/2, height/2 and crop_height/2 for the U and V
|
||
|
|
planes.
|
||
|
|
Return:
|
||
|
|
(bool): True if there are more frames to crop, False otherwise.
|
||
|
|
"""
|
||
|
|
for comp_width, comp_height, comp_crop_height in component_sizes:
|
||
|
|
for row in range(comp_height):
|
||
|
|
# Read the plane data for this row.
|
||
|
|
yuv_plane = yuv_file.read(comp_width)
|
||
|
|
|
||
|
|
# 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):
|
||
|
|
"""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)
|
||
|
|
|
||
|
|
yuv_file.close()
|
||
|
|
output_file.close()
|
||
|
|
|
||
|
|
|
||
|
|
def _parse_args():
|
||
|
|
"""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():
|
||
|
|
"""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()
|
||
|
|
|
||
|
|
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)
|
||
|
|
return 0
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
sys.exit(_main())
|