72 lines
1.8 KiB
Python
72 lines
1.8 KiB
Python
import array
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import math
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import pygame
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toneTable = {
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"jump": (660, 90),
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"doubleJump": (820, 90),
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"dash": (300, 80),
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"stomp": (200, 120),
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"pickup": (900, 70),
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"hurt": (160, 160),
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"die": (110, 300),
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"shoot": (420, 70),
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"checkpoint": (1040, 120),
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"levelComplete": (760, 260),
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"spark": (520, 40),
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}
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def synthTone(frequency, milliseconds, volume=0.25):
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mixerInfo = pygame.mixer.get_init()
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if mixerInfo is None:
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return None
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sampleRate, _, channels = mixerInfo
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frames = int(sampleRate * milliseconds / 1000.0)
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amplitude = int(32767 * volume)
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samples = array.array("h")
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for index in range(frames):
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envelope = 1.0 - index / frames
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value = int(amplitude * envelope * (1.0 if math.sin(2.0 * math.pi * frequency * index / sampleRate) >= 0 else -1.0))
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for _ in range(max(1, channels)):
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samples.append(value)
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return pygame.mixer.Sound(buffer=samples.tobytes())
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class PygameAudio:
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def __init__(self):
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self.enabled = False
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self.sounds = {}
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try:
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if pygame.mixer.get_init() is None:
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pygame.mixer.init()
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for name, (frequency, duration) in toneTable.items():
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sound = synthTone(frequency, duration)
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if sound is not None:
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self.sounds[name] = sound
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self.enabled = bool(self.sounds)
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except pygame.error:
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self.enabled = False
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def sink(self, event):
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if not self.enabled:
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return
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sound = self.sounds.get(event.name)
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if sound is not None:
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sound.play()
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class NullAudio:
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enabled = False
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def sink(self, event):
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pass
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def buildAudioSink():
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backend = PygameAudio()
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if backend.enabled:
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return backend.sink
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return NullAudio().sink
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