John McCardle
97dbec9106
New SoundBuffer Python type enables procedural audio generation: - Tone synthesis (sine, square, saw, triangle, noise) with ADSR envelopes - sfxr retro sound effect engine (7 presets, 24 params, mutation, seeding) - DSP effects chain: pitch_shift, low/high pass, echo, reverb, distortion, bit_crush, normalize, reverse, slice - Composition: concat (with crossfade overlap) and mix - Sound() now accepts SoundBuffer or filename string - Sound gains pitch property and play_varied() method - Platform stubs for HeadlessTypes and SDL2Types (loadFromSamples, pitch) - Interactive demo: sfxr clone UI + Animalese speech synthesizer - 62 unit tests across 6 test files (all passing) Refs #251 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
94 lines
3.6 KiB
Python
94 lines
3.6 KiB
Python
"""Test SoundBuffer sfxr synthesis."""
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import mcrfpy
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import sys
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# Test 1: All presets work
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presets = ["coin", "laser", "explosion", "powerup", "hurt", "jump", "blip"]
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for preset in presets:
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buf = mcrfpy.SoundBuffer.sfxr(preset)
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assert buf is not None, f"sfxr('{preset}') returned None"
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assert buf.sample_count > 0, f"sfxr('{preset}') has 0 samples"
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assert buf.duration > 0, f"sfxr('{preset}') has 0 duration"
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assert buf.sfxr_params is not None, f"sfxr('{preset}') has no params"
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print(f" PASS: sfxr('{preset}') -> {buf.duration:.3f}s, {buf.sample_count} samples")
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print("PASS: All sfxr presets generate audio")
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# Test 2: Deterministic with seed
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buf1 = mcrfpy.SoundBuffer.sfxr("coin", seed=42)
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buf2 = mcrfpy.SoundBuffer.sfxr("coin", seed=42)
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assert buf1.sample_count == buf2.sample_count, "Same seed should produce same sample count"
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assert buf1.duration == buf2.duration, "Same seed should produce same duration"
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print("PASS: Deterministic with seed")
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# Test 3: Different seeds produce different results
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buf3 = mcrfpy.SoundBuffer.sfxr("coin", seed=99)
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# May have same count by chance, but params should differ
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p1 = buf1.sfxr_params
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p3 = buf3.sfxr_params
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# At least one param should differ (with very high probability)
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differs = any(p1[k] != p3[k] for k in p1.keys() if k != 'wave_type')
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assert differs, "Different seeds should produce different params"
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print("PASS: Different seeds produce different results")
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# Test 4: sfxr_params dict contains expected keys
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params = buf1.sfxr_params
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expected_keys = [
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'wave_type', 'base_freq', 'freq_limit', 'freq_ramp', 'freq_dramp',
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'duty', 'duty_ramp', 'vib_strength', 'vib_speed',
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'env_attack', 'env_sustain', 'env_decay', 'env_punch',
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'lpf_freq', 'lpf_ramp', 'lpf_resonance',
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'hpf_freq', 'hpf_ramp',
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'pha_offset', 'pha_ramp', 'repeat_speed',
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'arp_speed', 'arp_mod'
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]
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for key in expected_keys:
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assert key in params, f"Missing key '{key}' in sfxr_params"
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print("PASS: sfxr_params has all expected keys")
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# Test 5: sfxr with custom params
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buf_custom = mcrfpy.SoundBuffer.sfxr(wave_type=2, base_freq=0.5, env_decay=0.3)
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assert buf_custom is not None
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assert buf_custom.sfxr_params is not None
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assert buf_custom.sfxr_params['wave_type'] == 2
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assert abs(buf_custom.sfxr_params['base_freq'] - 0.5) < 0.001
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print("PASS: sfxr with custom params")
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# Test 6: sfxr_mutate
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mutated = buf1.sfxr_mutate(0.1)
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assert mutated is not None
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assert mutated.sfxr_params is not None
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assert mutated.sample_count > 0
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# Params should be similar but different
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mp = mutated.sfxr_params
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op = buf1.sfxr_params
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differs = any(abs(mp[k] - op[k]) > 0.0001 for k in mp.keys() if isinstance(mp[k], float))
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# Note: with small mutation and few params, there's a chance all stay same.
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# But with 0.1 amount and ~20 float params, extremely unlikely all stay same.
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print(f"PASS: sfxr_mutate produces {'different' if differs else 'similar'} params")
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# Test 7: sfxr_mutate with seed for reproducibility
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m1 = buf1.sfxr_mutate(0.05, 42)
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m2 = buf1.sfxr_mutate(0.05, 42)
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assert m1.sample_count == m2.sample_count, "Same seed should produce same mutation"
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print("PASS: sfxr_mutate deterministic with seed")
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# Test 8: sfxr_mutate on non-sfxr buffer raises error
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tone_buf = mcrfpy.SoundBuffer.tone(440, 0.5, "sine")
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try:
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tone_buf.sfxr_mutate(0.1)
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assert False, "Should have raised RuntimeError"
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except RuntimeError:
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pass
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print("PASS: sfxr_mutate on non-sfxr buffer raises RuntimeError")
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# Test 9: Invalid preset raises ValueError
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try:
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mcrfpy.SoundBuffer.sfxr("nonexistent_preset")
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assert False, "Should have raised ValueError"
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except ValueError:
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pass
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print("PASS: Invalid preset raises ValueError")
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print("\nAll soundbuffer_sfxr tests passed!")
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sys.exit(0)
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