def testFFmpegAudioAnalyzer(self):
from klangbecken.playlist import ffmpeg_audio_analyzer
test_data = [
{"prefix": "padded", "gain": -17, "cue_in": 0.2, "cue_out": 0.8},
{"prefix": "padded-start", "gain": -3.33, "cue_in": 1, "cue_out": 2},
{"prefix": "padded-end", "gain": -3.55, "cue_in": 0, "cue_out": 1},
{"prefix": "sine-unicode", "gain": -14, "cue_in": 0, "cue_out": 5},
{"prefix": "interleaved", "gain": -14.16, "cue_in": 0.2, "cue_out": 0.8},
{"prefix": "unpadded-interleaved", "gain": -14, "cue_in": 0, "cue_out": 10},
]
for data in test_data:
for ext in "-jointstereo.mp3 -stereo.mp3".split():
self._analyzeOneFile(postfix=ext, **data)
# silence only file
with self.assertRaises(UnprocessableEntity) as cm:
path = os.path.join(
self.current_path, "audio", "silence-unicode-stereo.mp3"
)
ffmpeg_audio_analyzer("music", "id1", "mp3", path)
self.assertIn("track only contains silence", cm.exception.description.lower())
# invalid file
with self.assertRaises(UnprocessableEntity):
ffmpeg_audio_analyzer("music", "id1", "mp3", self.invalid_file)
def _analyzeOneFile(self, prefix, postfix, gain, cue_in, cue_out):
from klangbecken.playlist import MetadataChange, ffmpeg_audio_analyzer
name = prefix + postfix.split(".")[0]
ext = postfix.split(".")[1]
path = os.path.join(self.current_path, "audio", name + "." + ext)
changes = ffmpeg_audio_analyzer("jingles", name, ext, path)
self.assertEqual(len(changes), 6)
for change in changes:
self.assertIsInstance(change, MetadataChange)
changes = {key: val for key, val in changes}
self.assertEqual(
set(changes.keys()),
set("channels samplerate bitrate track_gain cue_in cue_out".split()),
)
# Track gain negativ and with units
measured_gain = changes["track_gain"]
self.assertTrue(measured_gain.endswith(" dB"))
# Be within ±0.5 dB of expected gain value
self.assertLess(abs(float(measured_gain[:-3]) - gain), 0.5)
# Be within the expected values for cue points
# Don't fade in late, or fade out early!
self.assertGreater(float(changes["cue_in"]), cue_in - 0.1)
self.assertLess(float(changes["cue_in"]), cue_in + 0.01)
self.assertGreater(float(changes["cue_out"]), cue_out - 0.02)
self.assertLess(float(changes["cue_out"]), cue_out + 0.1)
def testFFmpegAudioAnalyzerAudioQuality(self):
from klangbecken.playlist import ffmpeg_audio_analyzer
with self.assertRaises(UnprocessableEntity) as cm:
path = os.path.join(self.current_path, "audio", "not-an-audio-file.mp3")
ffmpeg_audio_analyzer("music", "id1", "mp3", path)
self.assertIn("cannot process audio data", cm.exception.description.lower())
with self.assertRaises(UnprocessableEntity) as cm:
path = os.path.join(self.current_path, "audio", "silence.wav")
ffmpeg_audio_analyzer("music", "id1", "mp3", path)
self.assertIn(
"the track is not a valid mp3 file", cm.exception.description.lower()
)
self.assertIn("ulaw", cm.exception.description.lower())
with self.assertRaises(UnprocessableEntity) as cm:
path = os.path.join(self.current_path, "audio", "silence.ogg")
ffmpeg_audio_analyzer("music", "id1", "mp3", path)
self.assertIn(
"the track is not a valid mp3 file", cm.exception.description.lower()
)
self.assertIn("vorbis", cm.exception.description.lower())
with self.assertRaises(UnprocessableEntity) as cm:
path = os.path.join(self.current_path, "audio", "silence-32kHz.mp3")
ffmpeg_audio_analyzer("music", "id1", "mp3", path)
self.assertIn("invalid sample rate: 32", cm.exception.description.lower())
with self.assertRaises(UnprocessableEntity) as cm:
path = os.path.join(self.current_path, "audio", "sine-unicode-mono.mp3")
ffmpeg_audio_analyzer("music", "id1", "mp3", path)
self.assertIn("stereo", cm.exception.description.lower())
path = os.path.join(self.current_path, "audio", "sine-unicode-mono.mp3")
changes = ffmpeg_audio_analyzer("jingles", "id1", "mp3", path)
self.assertEqual(len(changes), 6)
with self.assertRaises(UnprocessableEntity) as cm:
path = os.path.join(self.current_path, "audio", "silence-112kbps.mp3")
ffmpeg_audio_analyzer("music", "id1", "mp3", path)
self.assertIn("bitrate too low: 112 < 128", cm.exception.description.lower())