108 lines
3.6 KiB
Python
108 lines
3.6 KiB
Python
from subprocess import Popen, PIPE
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import re
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import os
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import sys
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import shutil
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import tempfile
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def get_process_output(command):
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"""
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Run subprocess and return stdout
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"""
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p = Popen(command, shell=True, stdout=PIPE)
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return p.communicate()[0].strip()
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def run_process(command):
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"""
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Run subprocess and return "return code"
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"""
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p = Popen(command, shell=True)
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return os.waitpid(p.pid, 0)[1]
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def get_mime_type(file_path):
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"""
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Attempts to get the mime type but will return prematurely if the process
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takes longer than 5 seconds. Note that this function should only be called
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for files which do not have a mp3/ogg/flac extension.
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"""
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return get_process_output("timeout 5 file -b --mime-type %s" % file_path)
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def duplicate_file(file_path):
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"""
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Makes a duplicate of the file and returns the path of this duplicate file.
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"""
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fsrc = open(file_path, 'r')
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fdst = tempfile.NamedTemporaryFile(delete=False)
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print "Copying %s to %s" % (file_path, fdst.name)
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shutil.copyfileobj(fsrc, fdst)
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fsrc.close()
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fdst.close()
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return fdst.name
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def calculate_replay_gain(file_path):
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"""
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This function accepts files of type mp3/ogg/flac and returns a calculated
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ReplayGain value in dB. If the value cannot be calculated for some reason,
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then we default to 0 (Unity Gain).
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http://wiki.hydrogenaudio.org/index.php?title=ReplayGain_1.0_specification
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"""
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try:
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"""
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Making a duplicate is required because the ReplayGain extraction utilities we use
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make unwanted modifications to the file.
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"""
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search = None
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temp_file_path = duplicate_file(file_path)
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if re.search(r'mp3$', temp_file_path, re.IGNORECASE) or get_mime_type(temp_file_path) == "audio/mpeg":
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if run_process("which mp3gain > /dev/null") == 0:
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out = get_process_output('mp3gain -q "%s" 2> /dev/null' % temp_file_path)
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search = re.search(r'Recommended "Track" dB change: (.*)', out)
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else:
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print "mp3gain not found"
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#Log warning
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elif re.search(r'ogg$', temp_file_path, re.IGNORECASE) or get_mime_type(temp_file_path) == "application/ogg":
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if run_process("which vorbisgain > /dev/null && which ogginfo > /dev/null") == 0:
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run_process('vorbisgain -q -f "%s" 2>/dev/null >/dev/null' % temp_file_path)
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out = get_process_output('ogginfo "%s"' % temp_file_path)
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search = re.search(r'REPLAYGAIN_TRACK_GAIN=(.*) dB', out)
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else:
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print "vorbisgain/ogginfo not found"
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#Log warning
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elif re.search(r'flac$', temp_file_path, re.IGNORECASE) or get_mime_type(temp_file_path) == "audio/x-flac":
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if run_process("which metaflac > /dev/null") == 0:
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out = get_process_output('metaflac --show-tag=REPLAYGAIN_TRACK_GAIN "%s"' % temp_file_path)
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search = re.search(r'REPLAYGAIN_TRACK_GAIN=(.*) dB', out)
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else:
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print "metaflac not found"
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#Log warning
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else:
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pass
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#Log unknown file type.
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#no longer need the temp, file simply remove it.
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os.remove(temp_file_path)
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except Exception, e:
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print e
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replay_gain = 0
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if search:
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matches = search.groups()
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if len(matches) == 1:
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replay_gain = matches[0]
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return replay_gain
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# Example of running from command line:
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# python replay_gain.py /path/to/filename.mp3
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if __name__ == "__main__":
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print calculate_replay_gain(sys.argv[1])
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