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# Copyright (c) 2017 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.
"""Data access utility functions and classes.
"""
import json
import os
def MakeDirectory(path):
"""Makes a directory recursively without rising exceptions if existing.
Args:
path: path to the directory to be created.
"""
if os.path.exists(path):
return
os.makedirs(path)
class Metadata(object):
"""Data access class to save and load metadata.
"""
def __init__(self):
pass
_GENERIC_METADATA_SUFFIX = '.mdata'
_AUDIO_TEST_DATA_FILENAME = 'audio_test_data.json'
@classmethod
def LoadFileMetadata(cls, filepath):
"""Loads generic metadata linked to a file.
Args:
filepath: path to the metadata file to read.
Returns:
A dict.
"""
with open(filepath + cls._GENERIC_METADATA_SUFFIX) as f:
return json.load(f)
@classmethod
def SaveFileMetadata(cls, filepath, metadata):
"""Saves generic metadata linked to a file.
Args:
filepath: path to the metadata file to write.
metadata: a dict.
"""
with open(filepath + cls._GENERIC_METADATA_SUFFIX, 'w') as f:
json.dump(metadata, f)
@classmethod
def LoadAudioTestDataPaths(cls, metadata_path):
"""Loads the input and the reference audio track paths.
Args:
metadata_path: path to the directory containing the metadata file.
Returns:
Tuple with the paths to the input and output audio tracks.
"""
metadata_filepath = os.path.join(metadata_path,
cls._AUDIO_TEST_DATA_FILENAME)
with open(metadata_filepath) as f:
return json.load(f)
@classmethod
def SaveAudioTestDataPaths(cls, output_path, **filepaths):
"""Saves the input and the reference audio track paths.
Args:
output_path: path to the directory containing the metadata file.
Keyword Args:
filepaths: collection of audio track file paths to save.
"""
output_filepath = os.path.join(output_path,
cls._AUDIO_TEST_DATA_FILENAME)
with open(output_filepath, 'w') as f:
json.dump(filepaths, f)
class AudioProcConfigFile(object):
"""Data access to load/save APM simulator argument lists.
The arguments stored in the config files are used to control the APM flags.
"""
def __init__(self):
pass
@classmethod
def Load(cls, filepath):
"""Loads a configuration file for an APM simulator.
Args:
filepath: path to the configuration file.
Returns:
A dict containing the configuration.
"""
with open(filepath) as f:
return json.load(f)
@classmethod
def Save(cls, filepath, config):
"""Saves a configuration file for an APM simulator.
Args:
filepath: path to the configuration file.
config: a dict containing the configuration.
"""
with open(filepath, 'w') as f:
json.dump(config, f)
class ScoreFile(object):
"""Data access class to save and load float scalar scores.
"""
def __init__(self):
pass
@classmethod
def Load(cls, filepath):
"""Loads a score from file.
Args:
filepath: path to the score file.
Returns:
A float encoding the score.
"""
with open(filepath) as f:
return float(f.readline().strip())
@classmethod
def Save(cls, filepath, score):
"""Saves a score into a file.
Args:
filepath: path to the score file.
score: float encoding the score.
"""
with open(filepath, 'w') as f:
f.write('{0:f}\n'.format(score))
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