31 lines
913 B
Python
31 lines
913 B
Python
import os
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from subprocess import Popen, PIPE
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import logging
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logger = logging.getLogger(__name__)
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SOX = 'sox'
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def peak_level(track_path):
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"""
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Accepts a path to a sox-decodable audio file.
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Returns track peak level from sox ('maximum amplitude') as a float.
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Returns None on error.
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"""
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if not os.path.exists(track_path):
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logger.warning("SoX peak detection failed: file not found")
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return None
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sox = Popen([SOX, track_path, "-n", "stats", "-b", "16"], stderr=PIPE)
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out, err = sox.communicate()
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if sox.returncode:
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logger.warning("SoX peak detection failed: " + str(sox.returncode))
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return None
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# relevant captured lines looks like this:
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# Min level -26215
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# Max level 26215
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min_level = int(err.splitlines()[2].split()[2])
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max_level = int(err.splitlines()[3].split()[2])
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return max(abs(min_level), abs(max_level))
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