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https://github.com/AnimeThemes/animethemes-webm-verifier.git
synced 2026-07-11 01:24:30 +02:00
Kyrch
56 lines
2.6 KiB
Python
56 lines
2.6 KiB
Python
"""A collection of tests to verify the file against audio encoding standards"""
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from ._test_webm import TestWebm
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class TestAudio(TestWebm):
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"""A collection of tests to verify the file against audio encoding standards"""
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# Audio must use the Opus format.
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def test_audio_codec(self):
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"""Test if the audio codec is opus"""
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audio_codec = self.webm_format.get_audio_stream_entry("codec_name")
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self.assertEqual(audio_codec, "opus", "Incorrect audio codec")
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# Audio must be normalized as described by the AES Streaming Loudness Recommendation.
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def test_loudness_i(self):
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"""Test if the average perceptual loudness is near the targeted -16 LUFS"""
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input_i = float(self.webm_format.get_loudness_entry("input_i"))
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self.assertTrue(-16.25 <= input_i <= -15.75, "Unexpected target loudness")
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# Audio must be normalized as described by the AES Streaming Loudness Recommendation.
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def test_loudness_tp(self):
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"""Test if the true peak of the audio stream is less than -1.0 dB"""
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input_tp = float(self.webm_format.get_loudness_entry("input_tp"))
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self.assertTrue(input_tp <= -1.0, "Unexpected true peak")
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# If the source is a DVD or BD release with a source bitrate of >= 320 kbps,
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# the audio stream must use a bitrate of 320 kbps.
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# Otherwise, the audio stream must use a default bitrate of 192 kbps.
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def test_audio_bitrate(self):
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"""Test if the audio bitrate is near the targeted 192 kbps or 320 kbps"""
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# Note: libopus defaults to VBR mode so we will allow for variance
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audio_bitrate = int(self.webm_format.get_audio_format_entry("bit_rate"))
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self.assertTrue(
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167000 <= audio_bitrate <= 217000 or 295000 <= audio_bitrate <= 345000,
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"Unexpected audio bitrate",
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)
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# Audio must use a sampling rate of 48k.
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def test_sample_rate(self):
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"""Test if the sampling rate is 48 kHz"""
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sample_rate = int(self.webm_format.get_audio_stream_entry("sample_rate"))
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self.assertEqual(sample_rate, 48000, "Incorrect sample rate")
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# Audio must use a two channel stereo mix.
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def test_channels(self):
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"""Test if there exists two audio channels"""
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channels = int(self.webm_format.get_audio_stream_entry("channels"))
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self.assertEqual(channels, 2, "Incorrect audio channels")
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# Audio must use a two channel stereo mix.
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def test_layout(self):
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"""Test if the audio layout is stereo"""
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channel_layout = self.webm_format.get_audio_stream_entry("channel_layout")
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self.assertEqual(channel_layout, "stereo", "Incorrect audio layout")
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