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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.
"""Echo path simulation factory module.
import numpy as np
from . import echo_path_simulation
class EchoPathSimulatorFactory(object):
# TODO(alessiob): Replace 5 ms delay (at 48 kHz sample rate) with a more
# realistic impulse response.
_LINEAR_ECHO_IMPULSE_RESPONSE = np.array([0.0]*(5 * 48) + [0.15])
def __init__(self):
def GetInstance(cls, echo_path_simulator_class, render_input_filepath):
"""Creates an EchoPathSimulator instance given a class object.
echo_path_simulator_class: EchoPathSimulator class object (not an
render_input_filepath: Path to the render audio track file.
An EchoPathSimulator instance.
assert render_input_filepath is not None or (
echo_path_simulator_class == echo_path_simulation.NoEchoPathSimulator)
if echo_path_simulator_class == echo_path_simulation.NoEchoPathSimulator:
return echo_path_simulation.NoEchoPathSimulator()
elif echo_path_simulator_class == (
return echo_path_simulation.LinearEchoPathSimulator(
render_input_filepath, cls._LINEAR_ECHO_IMPULSE_RESPONSE)
return echo_path_simulator_class(render_input_filepath)