Source code for

from __future__ import division

from import AudioClip
from 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()