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>
80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
"""Test SoundBuffer composition (concat, mix)."""
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import mcrfpy
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import sys
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# Create test buffers
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a = mcrfpy.SoundBuffer.tone(440, 0.3, "sine")
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b = mcrfpy.SoundBuffer.tone(880, 0.2, "sine")
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c = mcrfpy.SoundBuffer.tone(660, 0.4, "square")
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# Test 1: concat two buffers
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result = mcrfpy.SoundBuffer.concat([a, b])
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assert result is not None
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expected = a.duration + b.duration
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assert abs(result.duration - expected) < 0.02, f"Expected ~{expected:.3f}s, got {result.duration:.3f}s"
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print(f"PASS: concat([0.3s, 0.2s]) -> {result.duration:.3f}s")
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# Test 2: concat three buffers
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result3 = mcrfpy.SoundBuffer.concat([a, b, c])
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expected3 = a.duration + b.duration + c.duration
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assert abs(result3.duration - expected3) < 0.03
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print(f"PASS: concat([0.3s, 0.2s, 0.4s]) -> {result3.duration:.3f}s")
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# Test 3: concat with crossfade overlap
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overlapped = mcrfpy.SoundBuffer.concat([a, b], overlap=0.05)
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# Duration should be about 0.05s shorter than without overlap
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expected_overlap = a.duration + b.duration - 0.05
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assert abs(overlapped.duration - expected_overlap) < 0.03, \
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f"Expected ~{expected_overlap:.3f}s, got {overlapped.duration:.3f}s"
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print(f"PASS: concat with overlap=0.05 -> {overlapped.duration:.3f}s")
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# Test 4: mix two buffers
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mixed = mcrfpy.SoundBuffer.mix([a, b])
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assert mixed is not None
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# mix pads to longest buffer
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assert abs(mixed.duration - max(a.duration, b.duration)) < 0.02
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print(f"PASS: mix([0.3s, 0.2s]) -> {mixed.duration:.3f}s (padded to longest)")
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# Test 5: mix same duration buffers
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d = mcrfpy.SoundBuffer.tone(440, 0.5, "sine")
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e = mcrfpy.SoundBuffer.tone(660, 0.5, "sine")
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mixed2 = mcrfpy.SoundBuffer.mix([d, e])
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assert abs(mixed2.duration - 0.5) < 0.02
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print(f"PASS: mix([0.5s, 0.5s]) -> {mixed2.duration:.3f}s")
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# Test 6: concat empty list raises ValueError
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try:
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mcrfpy.SoundBuffer.concat([])
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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: concat([]) raises ValueError")
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# Test 7: mix empty list raises ValueError
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try:
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mcrfpy.SoundBuffer.mix([])
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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: mix([]) raises ValueError")
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# Test 8: concat with non-SoundBuffer raises TypeError
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try:
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mcrfpy.SoundBuffer.concat([a, "not a buffer"])
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assert False, "Should have raised TypeError"
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except TypeError:
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pass
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print("PASS: concat with invalid types raises TypeError")
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# Test 9: concat single buffer returns copy
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single = mcrfpy.SoundBuffer.concat([a])
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assert abs(single.duration - a.duration) < 0.02
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print("PASS: concat single buffer works")
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# Test 10: mix single buffer returns copy
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single_mix = mcrfpy.SoundBuffer.mix([a])
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assert abs(single_mix.duration - a.duration) < 0.02
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print("PASS: mix single buffer works")
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print("\nAll soundbuffer_compose tests passed!")
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sys.exit(0)
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