👷🏻♀️ determine length of mp3s via mutagen, not by file size
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1d173aa45a
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4 changed files with 12 additions and 10 deletions
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@ -2,6 +2,8 @@ import os
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import random
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import string
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from datetime import datetime, timedelta
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from functools import lru_cache
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from mutagen.mp3 import MP3
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def random_choices(population, k):
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@ -9,23 +11,23 @@ def random_choices(population, k):
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return [random.choice(population) for _ in range(k)]
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def mp3_sources(data_dir, pattern, kbits):
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def mp3_sources(data_dir, pattern):
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def start_time_for_source_fn(fn):
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return datetime.strptime(fn, pattern)
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return datetime.strptime(os.path.basename(fn), pattern)
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@lru_cache(maxsize=None)
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def length_for_source_fn(fn):
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size = os.stat(os.path.join(data_dir, fn)).st_size
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length = timedelta(minutes=size / (1000*kbits/8) / 60)
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return length
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return timedelta(seconds=MP3(fn).info.length)
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def get_sources():
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# Get a sorted list of all source files with start time and length
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sources = []
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for fn in os.listdir(data_dir):
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fn = os.path.join(data_dir, fn)
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try:
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start_time = start_time_for_source_fn(fn)
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length = length_for_source_fn(fn)
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sources.append({'fn': os.path.join(data_dir, fn), 'start_time': start_time, 'length': length})
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sources.append({'fn': fn, 'start_time': start_time, 'length': length})
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except ValueError:
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pass
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return sources
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@ -50,10 +52,9 @@ class Config:
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# [ {"fn": "/path/to/foo-20:01.mp3", "start_time": datetime(...), "length": timedelta(hours=1)} ]
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data_dir = os.environ.get('DATA_DIR') or '/var/tmp/prolefeeder-test-data'
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kbits = os.environ.get('KBITS') or 128
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pattern = 'qfhi-%Y%m%d-%H%M.mp3'
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if not os.path.exists(data_dir):
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raise RuntimeError("DATA_DIR does not exist")
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SOURCES = mp3_sources(data_dir, pattern, kbits)
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SOURCES = mp3_sources(data_dir, pattern)
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@ -10,7 +10,7 @@ def generate_test_file(fn, delta):
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'ffmpeg',
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'-f', 'lavfi',
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'-i', 'sine=frequency=1000:duration=%d' % delta.total_seconds(),
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'-b:a', '%dk' % Config.kbits,
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'-b:a', '%dk' % 128,
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fn
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])
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@ -3,7 +3,7 @@ import os
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def application(req_environ, start_response):
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# Work around having no access to Apache SetEnv variables:
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for k in ['SECRET_KEY', 'DATA_DIR', 'TMP_DIR', 'MAX_LENGTH', 'KBITS']:
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for k in ['SECRET_KEY', 'DATA_DIR', 'TMP_DIR', 'MAX_LENGTH']:
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if k in req_environ:
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os.environ[k] = req_environ[k]
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@ -3,3 +3,4 @@ bootstrap-flask
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python-dotenv
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flask-wtf >= 1.0.0
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WTForms >= 3.0.0
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mutagen
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