Question

def fade_in（和，渐变长度）： '''为那个wav文件做一个声音淡入'''new snd = sound.copy（snd）

for sample in new_snd:
    snd_index = sound.get_index(sample)
    factor = 0
    snd_samp = sound.get_sample(snd, snd_index)
    if snd_index <= fade_length:
        left = (sound.get_left(snd_samp) * factor)
        right = (sound.get_right(snd_samp) * factor)
        factor += 0.25
        sound.set_values(sample,int(left),int(right))
    else:
        left = sound.get_left(sample)
        right = sound.get_right(sample)
        sound.set_values(sample, int(left), int(right))

return new_snd

Answer 1

left和right将始终为零，因为您在for循环中每次运行时将factor设置为零。您必须在for循环之外声明factor：

def fade_in (snd, fade_length):
    new_snd = sound.copy(snd)
    factor = 0

    for sample in new_snd:
        snd_index = sound.get_index(sample)
        snd_samp = sound.get_sample(snd, snd_index)
        if snd_index <= fade_length:
            left = (sound.get_left(snd_samp) * factor)
            right = (sound.get_right(snd_samp) * factor)
            factor += 0.25
            sound.set_values(sample,int(left),int(right))
        else:
            left = sound.get_left(sample)
            right = sound.get_right(sample)
            sound.set_values(sample, int(left), int(right))

    return new_snd

怎么做Python中的淡入声音？

1 个答案: