generated from thinkode/modelRepository
71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
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from dataclasses import dataclass
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import numpy as np
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from moviepy.audio.AudioClip import CompositeAudioClip
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from moviepy.audio.fx.MultiplyVolume import MultiplyVolume
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from moviepy.Clip import Clip
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from moviepy.decorators import audio_video_effect
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from moviepy.Effect import Effect
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@dataclass
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class AudioDelay(Effect):
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"""Repeats audio certain number of times at constant intervals multiplying
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their volume levels using a linear space in the range 1 to ``decay`` argument
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value.
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Parameters
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----------
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offset : float, optional
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Gap between repetitions start times, in seconds.
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n_repeats : int, optional
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Number of repetitions (without including the clip itself).
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decay : float, optional
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Multiplication factor for the volume level of the last repetition. Each
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repetition will have a value in the linear function between 1 and this value,
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increasing or decreasing constantly. Keep in mind that the last repetition
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will be muted if this is 0, and if is greater than 1, the volume will increase
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for each repetition.
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Examples
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--------
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.. code:: python
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from moviepy import *
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videoclip = AudioFileClip('myaudio.wav').with_effects([
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afx.AudioDelay(offset=.2, n_repeats=10, decayment=.2)
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])
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# stereo A note
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frame_function = lambda t: np.array(
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[np.sin(440 * 2 * np.pi * t), np.sin(880 * 2 * np.pi * t)]
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).T
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clip = AudioClip(frame_function=frame_function, duration=0.1, fps=44100)
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clip = clip.with_effects([afx.AudioDelay(offset=.2, n_repeats=11, decay=0)])
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"""
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offset: float = 0.2
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n_repeats: int = 8
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decay: float = 1
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@audio_video_effect
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def apply(self, clip: Clip) -> Clip:
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"""Apply the effect to the clip."""
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decayments = np.linspace(1, max(0, self.decay), self.n_repeats + 1)
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return CompositeAudioClip(
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[
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clip.copy(),
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*[
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clip.with_start((rep + 1) * self.offset).with_effects(
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[MultiplyVolume(decayments[rep + 1])]
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)
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for rep in range(self.n_repeats)
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],
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]
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)
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