96 lines
3 KiB
Python
96 lines
3 KiB
Python
from datetime import datetime, timedelta
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import os.path
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from subprocess import Popen
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from config_manager import get_config
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def get_timefile_exact(time):
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'''
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time is of type `datetime`; it is not "rounded" to match the real file;
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that work is done in get_timefile(time)
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'''
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return os.path.join(
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get_config()['AUDIO_INPUT'],
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time.strftime('%Y-%m/%d/rec-%Y-%m-%d-%H-%M-%S-ror.mp3')
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)
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def round_timefile(exact):
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'''
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This will round the datetime, so to match the file organization structure
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'''
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return datetime(exact.year, exact.month, exact.day, exact.hour)
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def get_timefile(exact):
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return get_timefile_exact(round_timefile(exact))
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def get_files_and_intervals(start, end, rounder=round_timefile):
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'''
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both arguments are datetime objects
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returns an iterator whose elements are (filename, start_cut, end_cut)
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Cuts are expressed in seconds
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'''
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print '%s < %s' % (start, end)
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if end <= start:
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raise ValueError("end < start!")
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while start <= end:
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begin = rounder(start)
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start_cut = (start - begin).total_seconds()
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if end < begin + timedelta(seconds=3599):
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end_cut = (begin + timedelta(seconds=3599) - end).total_seconds()
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else:
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end_cut = 0
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yield (begin, start_cut, end_cut)
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start = begin + timedelta(hours=1)
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def mp3_join(named_intervals, target):
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'''
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Note that these are NOT the intervals returned by get_files_and_intervals,
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as they do not supply a filename, but only a datetime.
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What we want in input is basically the same thing, but with get_timefile()
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applied on the first element
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This function make the (quite usual) assumption that the only start_cut (if
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any) is at the first file, and the last one is at the last file
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'''
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ffmpeg = 'ffmpeg' # binary name
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startskip = None
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endskip = None
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files = []
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for (filename, start_cut, end_cut) in named_intervals:
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# this happens only one time, and only at the first iteration
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if start_cut:
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assert startskip is None
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startskip = start_cut
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# this happens only one time, and only at the first iteration
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if end_cut:
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assert endskip is None
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endskip = end_cut
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assert '|' not in filename
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files.append(filename)
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cmdline = [ffmpeg, '-i', 'concat:%s' % '|'.join(files), '-codec:a',
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'copy']
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if startskip is not None:
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cmdline += ['-ss', str(startskip)]
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if endskip is not None:
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cmdline += ['-to', str(len(files)*3600 - endskip)]
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cmdline += [target]
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cmdline += ['-loglevel', 'warning']
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return cmdline
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def create_mp3(start, end, outfile, options={}, **kwargs):
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p = Popen(mp3_join([(get_timefile(begin), start_cut, end_cut)
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for begin, start_cut, end_cut
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in get_files_and_intervals(start, end)],
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outfile))
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p.wait()
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if p.returncode != 0:
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raise OSError("return code was %d" % p.returncode)
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return True
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