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#
# Copyright (C) 2016-2020 by Nathan Lovato, Daniel Oakey, Razvan Radulescu, and contributors
#
# This file is part of Power Sequencer.
#
# Power Sequencer 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.
#
# Power Sequencer 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 Power Sequencer. If
# not, see <https://www.gnu.org/licenses/>.
#
import subprocess
import tempfile
def convert_and_trim(audio_filepath, freq, dur):
"""
Uses ffmpeg to convert an audio file to a temporary wav file for use
in finding offset.
Args
:audio: path to the audiofile to convert (string)
:freq: Samples / second in the output wav (int)
:dur: Max duration of the output wav in seconds (float)
Returns
:outpath: path to the output wav file
"""
tmp = tempfile.NamedTemporaryFile(mode="r+b", prefix="offset_", suffix=".wav")
outpath = tmp.name
tmp.close()
channel_count = "1"
subprocess.call(
[
"ffmpeg",
"-loglevel",
"panic",
"-i",
audio_filepath,
"-ac",
channel_count,
"-ar",
str(freq),
"-t",
str(dur),
"-acodec",
"pcm_s16le",
outpath,
]
)
return outpath
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