wehub-resource-sync
61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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"""Tests for audio utility functions."""
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import io
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import wave
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import mlx.core as mx
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import numpy as np
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from omlx.engine.audio_utils import audio_to_wav_bytes
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def _read_wav(data: bytes):
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"""Helper: parse WAV bytes and return (samples_int16, sample_rate)."""
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buf = io.BytesIO(data)
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with wave.open(buf, "rb") as wf:
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sr = wf.getframerate()
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frames = wf.readframes(wf.getnframes())
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return np.frombuffer(frames, dtype=np.int16), sr
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class TestAudioToWavBytes:
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def test_numpy_float32(self):
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audio = np.array([0.0, 0.5, -0.5, 1.0, -1.0], dtype=np.float32)
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wav = audio_to_wav_bytes(audio, 24000)
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samples, sr = _read_wav(wav)
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assert sr == 24000
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assert len(samples) == 5
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def test_mlx_float32(self):
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audio = mx.array([0.0, 0.5, -0.5], dtype=mx.float32)
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wav = audio_to_wav_bytes(audio, 16000)
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samples, sr = _read_wav(wav)
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assert sr == 16000
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assert len(samples) == 3
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def test_mlx_bfloat16(self):
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"""bfloat16 arrays (e.g. Kokoro-82M-bf16) must not crash."""
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audio = mx.array([0.0, 0.5, -0.5, 1.0, -1.0], dtype=mx.bfloat16)
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wav = audio_to_wav_bytes(audio, 24000)
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samples, sr = _read_wav(wav)
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assert sr == 24000
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assert len(samples) == 5
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# Verify values are reasonable after bf16 → f32 → int16 conversion
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assert samples[0] == 0
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assert samples[3] == 32767 # 1.0 clipped
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assert samples[4] == -32767 # -1.0 clipped
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def test_mlx_float16(self):
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audio = mx.array([0.0, 0.25], dtype=mx.float16)
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wav = audio_to_wav_bytes(audio, 24000)
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samples, _ = _read_wav(wav)
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assert len(samples) == 2
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def test_clipping(self):
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audio = np.array([2.0, -2.0], dtype=np.float32)
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wav = audio_to_wav_bytes(audio, 24000)
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samples, _ = _read_wav(wav)
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assert samples[0] == 32767
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assert samples[1] == -32767
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