Pygame.mixer.Sound .set_volume在Raspberry Pi中返回錯誤

Question

我嘗試在Raspberry Pi B2中使用pygame創建一些簡短信號
這是我的代碼：

#!/usr/bin/python
import pygame
import time
from array import array
from pygame.locals import *

pygame.mixer.pre_init(44100, -16, 1, 1024)
pygame.init()

class ToneSound(pygame.mixer.Sound):
    def __init__(self, frequency, volume):
        self.frequency = frequency
        pygame.mixer.Sound.__init__(self, self.build_samples())
        self.set_volume(volume)

    def build_samples(self):
        period = int(round(pygame.mixer.get_init()[0] / self.frequency))
        samples = array("h", [0] * period)
        amplitude = 2 ** (abs(pygame.mixer.get_init()[1]) - 1) - 1
        for time in xrange(period):
            if time < period / 2:
                samples[time] = amplitude
            else:
                samples[time] = -amplitude
        return samples

tone_obj = ToneSound(frequency = 800, volume = .5)

tone_obj.play(-1) #the -1 means to loop the sound
time.sleep(2)
tone_obj.stop()

當我運行它時，我得到：

Traceback (most recent call last):
    File "beep.py", line 29, in <module>
        tone_obj = ToneSound(frequency = 800, volume = .5)
    File "beep.py", line 15, in __init__
        self.set_volume(volume)
TypeError: fromfile() takes exactly 2 arguments (1 given)

當我評論set_volume函數時，出現下一個錯誤：

Traceback (most recent call last):
    File "beep.py", line 29, in <module>
        tone_obj.play(-1) #the -1 means to loop the sound
TypeError: fromfile() takes exactly 2 arguments (1 given)

可能是什么問題？
我更新了pygame，更新了所有需要的庫-相同的結果。
根據pygame的文檔，set_volume只接受一個參數。
我真的不知道該怎么辦...

Answer 1

有一個類似的問題發布到Raspberry Pi網站，請參閱“摩爾斯電碼項目無法正常工作...” 。

那里的解決方案是：

1. 更改： pygame.mixer.Sound.init(self, self.build_samples())
2. 到： pygame.mixer.Sound.init(self, buffer=self.build_samples())

添加buffer=對我有用。