Refactor barcode decoder to use Zxing's C++ version
By using the C++ version of Zxing, we can avoid having Java and Ant
as a dependency when running Video quality analysis on the bots.
This makes it far more easy to setup automation on new machines.
I also moved the scripts into the webrtc/ folder so it will be synced by default when building in Chrome (eliminating the need of a separate solution).
This CL also removes the need of the FFMPEG_HOME variable and replaces
its use with a command line flag to make the tool run smoothly on
Windows.
BUG=none
TEST=locally running the script on Windows, Mac and Linux.
Review URL: https://webrtc-codereview.appspot.com/1099007
git-svn-id: http://webrtc.googlecode.com/svn/trunk@3640 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/tools/barcode_tools/helper_functions.py b/webrtc/tools/barcode_tools/helper_functions.py
new file mode 100644
index 0000000..bb0b167
--- /dev/null
+++ b/webrtc/tools/barcode_tools/helper_functions.py
@@ -0,0 +1,96 @@
+#!/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 os
+import subprocess
+import sys
+
+_DEFAULT_PADDING = 4
+
+
+class HelperError(Exception):
+ """Exception raised for errors in the helper."""
+ pass
+
+
+def zero_pad(number, padding=_DEFAULT_PADDING):
+ """Converts an int into a zero padded string.
+
+ Args:
+ number(int): The number to convert.
+ padding(int): The number of chars in the output. Note that if you pass for
+ example number=23456 and padding=4, the output will still be '23456',
+ i.e. it will not be cropped. If you pass number=2 and padding=4, the
+ return value will be '0002'.
+ Return:
+ (string): The zero padded number converted to string.
+ """
+ return str(number).zfill(padding)
+
+
+def run_shell_command(cmd_list, fail_msg=None):
+ """Executes a command.
+
+ Args:
+ cmd_list(list): Command list to execute.
+ fail_msg(string): Message describing the error in case the command fails.
+
+ Return:
+ (string): The standard output from running the command.
+
+ Raise:
+ HelperError: If command fails.
+ """
+ process = subprocess.Popen(cmd_list, stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE)
+ output, error = process.communicate()
+ if process.returncode != 0:
+ if fail_msg:
+ print >> sys.stderr, fail_msg
+ raise HelperError('Failed to run %s: command returned %d and printed '
+ '%s and %s' % (' '.join(cmd_list), process.returncode,
+ output, error))
+ return output.strip()
+
+
+def perform_action_on_all_files(directory, file_pattern, file_extension,
+ start_number, action, **kwargs):
+ """Function that performs a given action on all files matching a pattern.
+
+ It is assumed that the files are named file_patternxxxx.file_extension, where
+ xxxx are digits. The file names start from
+ file_patern0..start_number>.file_extension.
+
+ Args:
+ directory(string): The directory where the files live.
+ file_pattern(string): The name pattern of the files.
+ file_extension(string): The files' extension.
+ start_number(int): From where to start to count frames.
+ action(function): The action to be performed over the files. Must return
+ False if the action failed, True otherwise.
+
+ Return:
+ (bool): Whether performing the action over all files was successful or not.
+ """
+ file_prefix = os.path.join(directory, file_pattern)
+ file_exists = True
+ file_number = start_number
+ errors = False
+
+ while file_exists:
+ zero_padded_file_number = zero_pad(file_number)
+ file_name = file_prefix + zero_padded_file_number + '.' + file_extension
+ if os.path.isfile(file_name):
+ if not action(file_name=file_name, **kwargs):
+ errors = True
+ break
+ file_number += 1
+ else:
+ file_exists = False
+ return not errors