/
fpcalc.py
executable file
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/
fpcalc.py
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# YouTubeMDBot
# Copyright (C) 2019 - Javinator9889
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
from subprocess import PIPE
from subprocess import Popen
from ..constants import FPCALC
def is_fpcalc_available() -> bool:
"""
Checks if ffmpeg is installed in the system.
:return: True if available, else False.
"""
try:
proc = Popen(["fpcalc", "-v"], stdout=PIPE, stderr=PIPE)
except OSError:
return False
else:
proc.wait()
class FPCalc:
"""
Calculates audio fingerprint by passing the audio bytes.
It operates with pipes so no file is created.
"""
def __init__(self, audio: bytes):
"""
Creates the FPCalc object.
:param audio: the audio bytes.
"""
fpcalc = Popen(FPCALC, stdout=PIPE, stdin=PIPE)
out, _ = fpcalc.communicate(audio)
res = out.decode("utf-8")
duration_pattern = "[^=]\\d+\\n"
fingerprint_pattern = "[^=]*$"
duration = re.search(duration_pattern, res)
fingerprint = re.search(fingerprint_pattern, res)
self.__duration: int = int(duration.group(0))
self.__fp: str = str(fingerprint.group(0))
def duration(self) -> int:
"""
Obtains the audio duration in seconds.
:return: duration in seconds.
"""
return self.__duration
def fingerprint(self) -> str:
"""
Obtains the audio fingerprint.
:return: fingerprint in seconds.
"""
return self.__fp