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from fractions import Fraction
import pytest
import av
from av import AudioFrame, AudioResampler
def test_flush_immediately() -> None:
"""
If we flush the resampler before passing any input, it returns
a `None` frame without setting up the graph.
"""
resampler = AudioResampler()
# flush
oframes = resampler.resample(None)
assert len(oframes) == 0
def test_identity_passthrough() -> None:
"""
If we don't ask it to do anything, it won't.
"""
resampler = AudioResampler()
# resample one frame
iframe = AudioFrame("s16", "stereo", 1024)
oframes = resampler.resample(iframe)
assert len(oframes) == 1
assert iframe is oframes[0]
# resample another frame
iframe.pts = 1024
oframes = resampler.resample(iframe)
assert len(oframes) == 1
assert iframe is oframes[0]
# flush
oframes = resampler.resample(None)
assert len(oframes) == 0
def test_matching_passthrough() -> None:
"""
If the frames match, it won't do anything.
"""
resampler = AudioResampler("s16", "stereo")
# resample one frame
iframe = AudioFrame("s16", "stereo", 1024)
oframes = resampler.resample(iframe)
assert len(oframes) == 1
assert iframe is oframes[0]
# resample another frame
iframe.pts = 1024
oframes = resampler.resample(iframe)
assert len(oframes) == 1
assert iframe is oframes[0]
# flush
oframes = resampler.resample(None)
assert len(oframes) == 0
def test_pts_assertion_same_rate() -> None:
av.logging.set_level(av.logging.VERBOSE)
resampler = AudioResampler("s16", "mono")
# resample one frame
iframe = AudioFrame("s16", "stereo", 1024)
iframe.sample_rate = 48000
iframe.time_base = Fraction(1, 48000)
iframe.pts = 0
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 0
assert oframe.time_base == iframe.time_base
assert oframe.sample_rate == iframe.sample_rate
assert oframe.samples == iframe.samples
# resample another frame
iframe.pts = 1024
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 1024
assert oframe.time_base == iframe.time_base
assert oframe.sample_rate == iframe.sample_rate
assert oframe.samples == iframe.samples
# resample another frame with a pts gap, do not raise exception
iframe.pts = 9999
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 9999
assert oframe.time_base == iframe.time_base
assert oframe.sample_rate == iframe.sample_rate
assert oframe.samples == iframe.samples
# flush
oframes = resampler.resample(None)
assert len(oframes) == 0
av.logging.set_level(None)
def test_pts_assertion_new_rate_up() -> None:
resampler = AudioResampler("s16", "mono", 44100)
# resample one frame
iframe = AudioFrame("s16", "stereo", 1024)
iframe.sample_rate = 48000
iframe.time_base = Fraction(1, 48000)
iframe.pts = 0
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 0
assert oframe.time_base == Fraction(1, 44100)
assert oframe.sample_rate == 44100
assert oframe.samples == 925
iframe = AudioFrame("s16", "stereo", 1024)
iframe.sample_rate = 48000
iframe.time_base = Fraction(1, 48000)
iframe.pts = 1024
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 925
assert oframe.time_base == Fraction(1, 44100)
assert oframe.sample_rate == 44100
assert oframe.samples == 941
# flush
oframes = resampler.resample(None)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 941 + 925
assert oframe.time_base == Fraction(1, 44100)
assert oframe.sample_rate == 44100
assert oframe.samples == 15
def test_pts_assertion_new_rate_down() -> None:
resampler = AudioResampler("s16", "mono", 48000)
# resample one frame
iframe = AudioFrame("s16", "stereo", 1024)
iframe.sample_rate = 44100
iframe.time_base = Fraction(1, 44100)
iframe.pts = 0
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 0
assert oframe.time_base == Fraction(1, 48000)
assert oframe.sample_rate == 48000
assert oframe.samples == 1098
iframe = AudioFrame("s16", "stereo", 1024)
iframe.sample_rate = 44100
iframe.time_base = Fraction(1, 44100)
iframe.pts = 1024
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 1098
assert oframe.time_base == Fraction(1, 48000)
assert oframe.sample_rate == 48000
assert oframe.samples == 1114
# flush
oframes = resampler.resample(None)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 1114 + 1098
assert oframe.time_base == Fraction(1, 48000)
assert oframe.sample_rate == 48000
assert oframe.samples == 18
def test_pts_assertion_new_rate_fltp() -> None:
resampler = AudioResampler("fltp", "mono", 8000, 1024)
# resample one frame
iframe = AudioFrame("s16", "mono", 1024)
iframe.sample_rate = 8000
iframe.time_base = Fraction(1, 1000)
iframe.pts = 0
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 0
assert oframe.time_base == Fraction(1, 8000)
assert oframe.sample_rate == 8000
assert oframe.samples == 1024
iframe = AudioFrame("s16", "mono", 1024)
iframe.sample_rate = 8000
iframe.time_base = Fraction(1, 1000)
iframe.pts = 8192
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 65536
assert oframe.time_base == Fraction(1, 8000)
assert oframe.sample_rate == 8000
assert oframe.samples == 1024
# flush
oframes = resampler.resample(None)
assert len(oframes) == 0
def test_pts_missing_time_base() -> None:
resampler = AudioResampler("s16", "mono", 44100)
# resample one frame
iframe = AudioFrame("s16", "stereo", 1024)
iframe.sample_rate = 48000
iframe.pts = 0
oframes = resampler.resample(iframe)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 0
assert oframe.time_base == Fraction(1, 44100)
assert oframe.sample_rate == 44100
# flush
oframes = resampler.resample(None)
assert len(oframes) == 1
oframe = oframes[0]
assert oframe.pts == 925
assert oframe.time_base == Fraction(1, 44100)
assert oframe.sample_rate == 44100
assert oframe.samples == 16
def test_mismatched_input() -> None:
"""
Consecutive frames must have the same layout, sample format and sample rate.
"""
resampler = AudioResampler("s16", "mono", 44100)
# resample one frame
iframe = AudioFrame("s16", "stereo", 1024)
iframe.sample_rate = 48000
resampler.resample(iframe)
# resample another frame with a sample format
iframe = AudioFrame("s16", "mono", 1024)
iframe.sample_rate = 48000
with pytest.raises(
ValueError, match="Frame does not match AudioResampler setup."
) as cm:
resampler.resample(iframe)
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