8721ba1caf
* standardise program/sox.py formatting, add test case
* add program/sox.peak_level() docstring
* update .travis.yml to include sox as a test dependency
* move sox from test dependency to normal dependency
* update README to mention sox, remove small autoconf mention
* use .splitlines() instead of .split('n')
25 lines
735 B
Python
25 lines
735 B
Python
import logging
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import os
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from subprocess import Popen, PIPE
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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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logging.warning("SoX peak detection failed: file not found")
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return None
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sox = Popen([SOX, track_path, "-n", "stat"], stderr=PIPE)
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out, err = sox.communicate()
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if sox.returncode:
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logging.warning("SoX peak detection failed: " + str(sox.returncode))
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return None
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# relevant captured line looks like:
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# Maximum amplitude: 0.123456
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return float(err.splitlines()[3].split()[2])
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