Question

我想创建一个类似文件的对象，稍后将通过其文件名打开它。有可能这样做吗？我正在寻找这样的东西：

import io

fileLikeObject = io.BytesIO()
fileLikeObject.write((b"randomContent")
fileLikeObject.name = "someFilename.txt"

sameFileAsbefore = open("someFilename.txt", "rb")
sameFileAsbefore.read()

我看过this thread，但此后无法通过文件名访问该文件。

为了完整起见，我要专门做的是生成一个正弦波形并在Android环境中播放。这是改编自this answer的代码。

from kivy.core.audio import SoundLoader
from kivy.base import runTouchApp
from kivy.uix.button import Button
import time


# Wave parameters
fs = 44100 # sampling frequency
duration = 2 # seconds

# Generating waveforms
timePoints = np.linspace(0, duration, duration*fs)
sineWave = np.sin(2 * np.pi * 440 * timePoints) # 440 Hz
outdata = np.transpose(np.tile(volume*outputWave, (2,1)))

class MyLabel(Button):
    def on_release(self):
        start_time = time.time()
        self.play_sound()
        print("--- %s seconds ---" % (time.time() - start_time))

    def play_sound(self):

        bytes_out = io.BytesIO()
        wavfile.write(bytes_out, fs, outdata)
        bytes_out.seek(0)

        sound = SoundLoader.load(bytes_out) # only loads by filename :/
        sound.seek(0)

        if sound:
            print("Sound found at %s" % sound.source)
            print("Sound is %.3f seconds" % sound.length)
            sound.play()

runTouchApp(MyLabel(text="Press me for a sound"))

我也愿意接受其他解决方案，使我可以在Android上播放机器生成的声音。感谢您的帮助！

Answer 1

俗话说，“过早的优化是万恶之源”，对吧？

基于@fins的评论，我创建了临时文件来使用库tempfile存储音频。关闭文件后，它将自动销毁文件。

以下是我在问题中发布的内容的工作版本：

from kivy.core.audio import SoundLoader
from kivy.base import runTouchApp
from kivy.uix.button import Button
from scipy.io import wavfile
import time
import tempfile
import numpy as np

# Wave parameters
fs = 44100 # sampling frequency
duration = 2 # seconds

# Generating waveforms
timePoints = np.linspace(0, duration, duration*fs)
sineWave = np.sin(2 * np.pi * 440 * timePoints) # 440 Hz
outdata = np.transpose(np.tile(sineWave, (2,1)))

class MyLabel(Button):
    def on_release(self):
        start_time = time.time()
        self.play_sound()
        print("--- %s seconds ---" % (time.time() - start_time))

    def play_sound(self):

        f = tempfile.NamedTemporaryFile(suffix = '.wav', delete=True)
        wavfile.write(f, fs, outdata)
        f.seek(0)

        sound = SoundLoader.load(f.name)

        if sound:
            print("Sound found at %s" % sound.source)
            print("Sound is %.3f seconds" % sound.length)
            sound.play()

        f.close()

runTouchApp(MyLabel(text="Press me for a sound"))

python-按文件名打开类似文件的对象

1 个答案: