from __future__ import division
from moviepy.audio.AudioClip import AudioClip
from moviepy.audio.io.readers import FFMPEG_AudioReader
[docs]class AudioFileClip(AudioClip):
"""
An audio clip read from a sound file, or an array.
The whole file is not loaded in memory. Instead, only a portion is
read and stored in memory. this portion includes frames before
and after the last frames read, so that it is fast to read the sound
backward and forward.
Parameters
------------
filename
Either a soundfile name (of any extension supported by ffmpeg)
or an array representing a sound. If the soundfile is not a .wav,
it will be converted to .wav first, using the ``fps`` and
``bitrate`` arguments.
buffersize:
Size to load in memory (in number of frames)
Attributes
------------
nbytes
Number of bits per frame of the original audio file.
fps
Number of frames per second in the audio file
buffersize
See Parameters.
Lifetime
--------
Note that this creates subprocesses and locks files. If you construct one of these instances, you must call
close() afterwards, or the subresources will not be cleaned up until the process ends.
If copies are made, and close() is called on one, it may cause methods on the other copies to fail.
However, coreaders must be closed separately.
Examples
----------
>>> snd = AudioFileClip("song.wav")
>>> snd.close()
>>> snd = AudioFileClip("song.mp3", fps = 44100)
>>> second_reader = snd.coreader()
>>> second_reader.close()
>>> snd.close()
>>> with AudioFileClip(mySoundArray, fps=44100) as snd: # from a numeric array
>>> pass # Close is implicitly performed by context manager.
"""
def __init__(self, filename, buffersize=200000, nbytes=2, fps=44100):
AudioClip.__init__(self)
self.filename = filename
self.reader = FFMPEG_AudioReader(filename, fps=fps, nbytes=nbytes,
buffersize=buffersize)
self.fps = fps
self.duration = self.reader.duration
self.end = self.reader.duration
self.buffersize = self.reader.buffersize
self.make_frame = lambda t: self.reader.get_frame(t)
self.nchannels = self.reader.nchannels
[docs] def coreader(self):
""" Returns a copy of the AudioFileClip, i.e. a new entrance point
to the audio file. Use copy when you have different clips
watching the audio file at different times. """
return AudioFileClip(self.filename, self.buffersize)
[docs] def close(self):
""" Close the internal reader. """
if self.reader:
self.reader.close_proc()
self.reader = None
def __del__(self):
self.close()