Port of audio to GStreamer 1.0

Includes:
 - transcoders
 - thumbs
 - tests

mediagoblin/tests/test_audio.py

@@ -0,0 +1,104 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2013 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import tempfile
+import shutil
+import os
+import pytest
+from contextlib import contextmanager
+import logging
+import imghdr
+
+#os.environ['GST_DEBUG'] = '4,python:4'
+
+#TODO: this should be skipped if video plugin is not enabled
+import gi
+gi.require_version('Gst', '1.0')
+from gi.repository import Gst
+Gst.init(None)
+
+from mediagoblin.media_types.audio.transcoders import (AudioTranscoder,
+        AudioThumbnailer)
+from mediagoblin.media_types.tools import discover
+
+
+@contextmanager
+def create_audio():
+    audio = tempfile.NamedTemporaryFile()
+    src = Gst.ElementFactory.make('audiotestsrc', None)
+    src.set_property('num-buffers', 50)
+    enc = Gst.ElementFactory.make('flacenc', None)
+    dst = Gst.ElementFactory.make('filesink', None)
+    dst.set_property('location', audio.name)
+    pipeline = Gst.Pipeline()
+    pipeline.add(src)
+    pipeline.add(enc)
+    pipeline.add(dst)
+    src.link(enc)
+    enc.link(dst)
+    pipeline.set_state(Gst.State.PLAYING)
+    state = pipeline.get_state(3 * Gst.SECOND)
+    assert state[0] == Gst.StateChangeReturn.SUCCESS
+    bus = pipeline.get_bus()
+    bus.timed_pop_filtered(
+            3 * Gst.SECOND,
+            Gst.MessageType.ERROR | Gst.MessageType.EOS)
+    pipeline.set_state(Gst.State.NULL)
+    yield (audio.name)
+
+
+@contextmanager
+def create_data_for_test():
+    with create_audio() as audio_name:
+        second_file = tempfile.NamedTemporaryFile()
+        yield (audio_name, second_file.name)
+
+
+def test_transcoder():
+    '''
+    Tests AudioTransocder's transcode method
+    '''
+    transcoder = AudioTranscoder()
+    with create_data_for_test() as (audio_name, result_name):
+        transcoder.transcode(audio_name, result_name, quality=0.3,
+                             progress_callback=None)
+        info = discover(result_name)
+        assert len(info.get_audio_streams()) == 1
+        transcoder.transcode(audio_name, result_name, quality=0.3,
+                             mux_name='oggmux', progress_callback=None)
+        info = discover(result_name)
+        assert len(info.get_audio_streams()) == 1
+
+
+def test_thumbnails():
+    '''Test thumbnails generation.
+
+    The code below heavily repeats
+    audio.processing.CommonAudioProcessor.create_spectrogram
+    1. Create test audio
+    2. Convert it to OGG source for spectogram using transcoder
+    3. Create spectogram in jpg
+
+    '''
+    thumbnailer = AudioThumbnailer()
+    transcoder = AudioTranscoder()
+    with create_data_for_test() as (audio_name, new_name):
+        transcoder.transcode(audio_name, new_name, mux_name='oggmux')
+        thumbnail = tempfile.NamedTemporaryFile(suffix='.jpg')
+        # fft_size below is copypasted from config_spec.ini
+        thumbnailer.spectrogram(new_name, thumbnail.name, width=100,
+                                fft_size=4096)
+        assert imghdr.what(thumbnail.name) == 'jpeg'