[英]How to use getAssets().open(filename) with FileWriter?
[英]python - Open filelike object by filename
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()
我已经看过了这个线程 ,但是以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。 这是根据此答案改编而成的代码。
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"))
我也欢迎其他解决方案,使我能够在Android上播放机器生成的声音。 感谢您的帮助!
俗话说,“过早的优化是万恶之源”,对吗?
基于@fins的注释,我创建了临时文件来使用tempfile库存储音频。 关闭文件时,它将自动销毁文件。
这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"))
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