在Pygame中进行中的两个音乐曲目之间逐渐消失

问题描述

我的意图是让两个音轨，它们性质相似，并且在不同时间相互淡入.当出现这种淡入淡出时，一个音轨应在短时间内从全音量淡入静音，同时，另一音轨应从0淡入到100，并从同一时间索引继续播放 .他们必须能够随时动态执行此操作-发生某种动作时，将发生淡入淡出，并且新曲目将在与其他曲目相同的位置开始播放一个人离开.

My intention is to have two music tracks, which are similar in nature, fade between each other at various times. When such a fade occurs, one music track should fade from full volume to muted in a short period of time, and, simultaneously, the other track should fade from 0 to 100 and continue playing from the same time index. They must be able to do this dynamically at any time - when a certain action occurs, the fade will occur and the new track will start playing at the same position that the other one left off at.

这可能是通过使用音量操纵或通过启动和停止音乐来实现的(但是，似乎只有淡出"选项存在，而缺少淡出"选项).我怎样才能做到这一点?存在的最佳方法是什么?如果无法使用Pygame，则可以接受 Pygame的替代方案.

This might be plausible by either using volume manipulation or by starting and stopping the music (however, it appears that only a "fadeout" option exists, and there is a lack of a "fadein" option). How can I do this? What is the best method, if any, that exists? If it is impossible using Pygame, alternatives to Pygame are acceptable.

推荐答案

尝试一下，很简单.

import pygame

pygame.mixer.init()
pygame.init()

# Maybe you can subclass the pygame.mixer.Sound and
# add the methods below to it..
class Fader(object):
    instances = []
    def __init__(self, fname):
        super(Fader, self).__init__()
        assert isinstance(fname, basestring)
        self.sound = pygame.mixer.Sound(fname)
        self.increment = 0.01 # tweak for speed of effect!!
        self.next_vol = 1 # fade to 100 on start
        Fader.instances.append(self)

    def fade_to(self, new_vol):
        # you could change the increment here based on something..
        self.next_vol = new_vol

    @classmethod
    def update(cls):
        for inst in cls.instances:
            curr_volume = inst.sound.get_volume()
            # print inst, curr_volume, inst.next_vol
            if inst.next_vol > curr_volume:
                inst.sound.set_volume(curr_volume + inst.increment)
            elif inst.next_vol < curr_volume:
                inst.sound.set_volume(curr_volume - inst.increment)

sound1 = Fader("1.wav")
sound2 = Fader("2.wav")
sound1.sound.play()
sound2.sound.play()
sound2.sound.set_volume(0)

# fading..
sound1.fade_to(0)
sound2.fade_to(1)


while True:
    Fader.update() # a call that will update all the faders..

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