mediagoblin/tests/test_audio.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2013 MediaGoblin contributors.  See AUTHORS.
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 import tempfile
  18 import shutil
  19 import os
  20 import pytest
  21 from contextlib import contextmanager
  22 import logging
  23 import imghdr
  24
  25 #os.environ['GST_DEBUG'] = '4,python:4'
  26
  27 pytest.importorskip("gi.repository.Gst")
  28 pytest.importorskip("scikits.audiolab")
  29 import gi
  30 gi.require_version('Gst', '1.0')
  31 from gi.repository import Gst
  32 Gst.init(None)
  33
  34 from mediagoblin.media_types.audio.transcoders import (AudioTranscoder,
  35         AudioThumbnailer)
  36 from mediagoblin.media_types.tools import discover
  37
  38
  39 @contextmanager
  40 def create_audio():
  41     audio = tempfile.NamedTemporaryFile()
  42     src = Gst.ElementFactory.make('audiotestsrc', None)
  43     src.set_property('num-buffers', 50)
  44     enc = Gst.ElementFactory.make('flacenc', None)
  45     dst = Gst.ElementFactory.make('filesink', None)
  46     dst.set_property('location', audio.name)
  47     pipeline = Gst.Pipeline()
  48     pipeline.add(src)
  49     pipeline.add(enc)
  50     pipeline.add(dst)
  51     src.link(enc)
  52     enc.link(dst)
  53     pipeline.set_state(Gst.State.PLAYING)
  54     state = pipeline.get_state(3 * Gst.SECOND)
  55     assert state[0] == Gst.StateChangeReturn.SUCCESS
  56     bus = pipeline.get_bus()
  57     bus.timed_pop_filtered(
  58             3 * Gst.SECOND,
  59             Gst.MessageType.ERROR | Gst.MessageType.EOS)
  60     pipeline.set_state(Gst.State.NULL)
  61     yield (audio.name)
  62
  63
  64 @contextmanager
  65 def create_data_for_test():
  66     with create_audio() as audio_name:
  67         second_file = tempfile.NamedTemporaryFile()
  68         yield (audio_name, second_file.name)
  69
  70
  71 def test_transcoder():
  72     '''
  73     Tests AudioTransocder's transcode method
  74     '''
  75     transcoder = AudioTranscoder()
  76     with create_data_for_test() as (audio_name, result_name):
  77         transcoder.transcode(audio_name, result_name, quality=0.3,
  78                              progress_callback=None)
  79         info = discover(result_name)
  80         assert len(info.get_audio_streams()) == 1
  81         transcoder.transcode(audio_name, result_name, quality=0.3,
  82                              mux_name='oggmux', progress_callback=None)
  83         info = discover(result_name)
  84         assert len(info.get_audio_streams()) == 1
  85
  86
  87 def test_thumbnails():
  88     '''Test thumbnails generation.
  89
  90     The code below heavily repeats
  91     audio.processing.CommonAudioProcessor.create_spectrogram
  92     1. Create test audio
  93     2. Convert it to OGG source for spectogram using transcoder
  94     3. Create spectogram in jpg
  95
  96     '''
  97     thumbnailer = AudioThumbnailer()
  98     transcoder = AudioTranscoder()
  99     with create_data_for_test() as (audio_name, new_name):
 100         transcoder.transcode(audio_name, new_name, mux_name='oggmux')
 101         thumbnail = tempfile.NamedTemporaryFile(suffix='.jpg')
 102         # fft_size below is copypasted from config_spec.ini
 103         thumbnailer.spectrogram(new_name, thumbnail.name, width=100,
 104                                 fft_size=4096)
 105         assert imghdr.what(thumbnail.name) == 'jpeg'