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#!/usr/bin/env python
# Copyright (c) 2013 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 shutil
import subprocess
import sys
import tempfile
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
# Chrome browsertests will throw away stderr; avoid that output gets lost.
sys.stderr = sys.stdout
def _ParseArgs():
"""Registers the command-line options."""
usage = 'usage: %prog [options]'
parser = optparse.OptionParser(usage=usage)
parser.add_option('--label', type='string', default='MY_TEST',
help=('Label of the test, used to identify different '
'tests. Default: %default'))
parser.add_option('--ref_video', type='string',
help='Reference video to compare with (YUV).')
parser.add_option('--test_video', type='string',
help=('Test video to be compared with the reference '
'video (YUV).'))
parser.add_option('--frame_analyzer', type='string',
help='Path to the frame analyzer executable.')
parser.add_option('--barcode_decoder', type='string',
help=('Path to the barcode decoder script. By default, we '
'will assume we can find it in barcode_tools/'
'relative to this directory.'))
parser.add_option('--ffmpeg_path', type='string',
help=('The path to where the ffmpeg executable is located. '
'If omitted, it will be assumed to be present in the '
'PATH with the name ffmpeg[.exe].'))
parser.add_option('--zxing_path', type='string',
help=('The path to where the zxing executable is located. '
'If omitted, it will be assumed to be present in the '
'PATH with the name zxing[.exe].'))
parser.add_option('--stats_file', type='string', default='stats.txt',
help=('Path to the temporary stats file to be created and '
'used. Default: %default'))
parser.add_option('--yuv_frame_width', type='int', default=640,
help='Width of the YUV file\'s frames. Default: %default')
parser.add_option('--yuv_frame_height', type='int', default=480,
help='Height of the YUV file\'s frames. Default: %default')
options, _args = parser.parse_args()
if not options.ref_video:
parser.error('You must provide a path to the reference video!')
if not os.path.exists(options.ref_video):
parser.error('Cannot find the reference video at %s' % options.ref_video)
if not options.test_video:
parser.error('You must provide a path to the test video!')
if not os.path.exists(options.test_video):
parser.error('Cannot find the test video at %s' % options.test_video)
if not options.frame_analyzer:
parser.error('You must provide the path to the frame analyzer executable!')
if not os.path.exists(options.frame_analyzer):
parser.error('Cannot find frame analyzer executable at %s!' %
options.frame_analyzer)
return options
def main():
"""The main function.
A simple invocation is:
./webrtc/tools/barcode_tools/compare_videos.py
--ref_video=<path_and_name_of_reference_video>
--test_video=<path_and_name_of_test_video>
--frame_analyzer=<path_and_name_of_the_frame_analyzer_executable>
Notice that the prerequisites for barcode_decoder.py also applies to this
script. The means the following executables have to be available in the PATH:
* zxing
* ffmpeg
"""
options = _ParseArgs()
if options.barcode_decoder:
path_to_decoder = options.barcode_decoder
else:
path_to_decoder = os.path.join(SCRIPT_DIR, 'barcode_tools',
'barcode_decoder.py')
# On Windows, sometimes the inherited stdin handle from the parent process
# fails. Work around this by passing null to stdin to the subprocesses.
null_filehandle = open(os.devnull, 'r')
# Run barcode decoder on the test video to identify frame numbers.
png_working_directory = tempfile.mkdtemp()
cmd = [
sys.executable,
path_to_decoder,
'--yuv_file=%s' % options.test_video,
'--yuv_frame_width=%d' % options.yuv_frame_width,
'--yuv_frame_height=%d' % options.yuv_frame_height,
'--stats_file=%s' % options.stats_file,
'--png_working_dir=%s' % png_working_directory,
]
if options.zxing_path:
cmd.append('--zxing_path=%s' % options.zxing_path)
if options.ffmpeg_path:
cmd.append('--ffmpeg_path=%s' % options.ffmpeg_path)
barcode_decoder = subprocess.Popen(cmd, stdin=null_filehandle,
stdout=sys.stdout, stderr=sys.stderr)
barcode_decoder.wait()
shutil.rmtree(png_working_directory)
if barcode_decoder.returncode != 0:
print 'Failed to run barcode decoder script.'
return 1
# Run frame analyzer to compare the videos and print output.
cmd = [
options.frame_analyzer,
'--label=%s' % options.label,
'--reference_file=%s' % options.ref_video,
'--test_file=%s' % options.test_video,
'--stats_file=%s' % options.stats_file,
'--width=%d' % options.yuv_frame_width,
'--height=%d' % options.yuv_frame_height,
]
frame_analyzer = subprocess.Popen(cmd, stdin=null_filehandle,
stdout=sys.stdout, stderr=sys.stderr)
frame_analyzer.wait()
if frame_analyzer.returncode != 0:
print 'Failed to run frame analyzer.'
return 1
return 0
if __name__ == '__main__':
sys.exit(main())
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